Windows: Add XZip library files (http://www.codeproject.com/Articles/4135/XZip-and-XUnzip-Add-zip-and-or-unzip-to-your-app-w)

author: Mounir IDRASSI <mounir.idrassi@idrix.fr> 2016-08-14 02:20:42 +0200
committer: Mounir IDRASSI <mounir.idrassi@idrix.fr> 2016-08-15 01:09:16 +0200
commit: 4cf9db9f9556ab1127f5bce91db6c02028637b57 (patch)
tree: 2f83feeca3fa92a4fbed8f55c00e41c40072f9ea /src/Common/XZip.cpp
parent: c4d4ade9d00e65112b93640bd3a0eeb50279a202 (diff)
download: VeraCrypt-4cf9db9f9556ab1127f5bce91db6c02028637b57.tar.gz
VeraCrypt-4cf9db9f9556ab1127f5bce91db6c02028637b57.zip
1 files changed, 3209 insertions, 0 deletions
diff --git a/src/Common/XZip.cpp b/src/Common/XZip.cpp
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+// XZip.cpp  Version 1.3
+//
+// Authors:      Mark Adler et al. (see below)
+//
+// Modified by:  Lucian Wischik
+//               lu@wischik.com
+//
+// Version 1.0   - Turned C files into just a single CPP file
+//               - Made them compile cleanly as C++ files
+//               - Gave them simpler APIs
+//               - Added the ability to zip/unzip directly in memory without 
+//                 any intermediate files
+// 
+// Modified by:  Hans Dietrich
+//               hdietrich@gmail.com
+//
+// Version 1.3:  - Fixed UTC problem
+//
+// Version 1.2:  - Many bug fixes.  See CodeProject article for list.
+//
+// Version 1.1:  - Added Unicode support to CreateZip() and ZipAdd()
+//               - Changed file names to avoid conflicts with Lucian's files
+//
+///////////////////////////////////////////////////////////////////////////////
+//
+// Lucian Wischik's comments:
+// --------------------------
+// THIS FILE is almost entirely based upon code by Info-ZIP.
+// It has been modified by Lucian Wischik.
+// The original code may be found at http://www.info-zip.org
+// The original copyright text follows.
+//
+///////////////////////////////////////////////////////////////////////////////
+//
+// Original authors' comments:
+// ---------------------------
+// This is version 2002-Feb-16 of the Info-ZIP copyright and license. The 
+// definitive version of this document should be available at 
+// ftp://ftp.info-zip.org/pub/infozip/license.html indefinitely.
+// 
+// Copyright (c) 1990-2002 Info-ZIP.  All rights reserved.
+//
+// For the purposes of this copyright and license, "Info-ZIP" is defined as
+// the following set of individuals:
+//
+//   Mark Adler, John Bush, Karl Davis, Harald Denker, Jean-Michel Dubois,
+//   Jean-loup Gailly, Hunter Goatley, Ian Gorman, Chris Herborth, Dirk Haase,
+//   Greg Hartwig, Robert Heath, Jonathan Hudson, Paul Kienitz, 
+//   David Kirschbaum, Johnny Lee, Onno van der Linden, Igor Mandrichenko, 
+//   Steve P. Miller, Sergio Monesi, Keith Owens, George Petrov, Greg Roelofs, 
+//   Kai Uwe Rommel, Steve Salisbury, Dave Smith, Christian Spieler, 
+//   Antoine Verheijen, Paul von Behren, Rich Wales, Mike White
+//
+// This software is provided "as is", without warranty of any kind, express
+// or implied.  In no event shall Info-ZIP or its contributors be held liable
+// for any direct, indirect, incidental, special or consequential damages
+// arising out of the use of or inability to use this software.
+//
+// Permission is granted to anyone to use this software for any purpose,
+// including commercial applications, and to alter it and redistribute it
+// freely, subject to the following restrictions:
+//
+//    1. Redistributions of source code must retain the above copyright notice,
+//       definition, disclaimer, and this list of conditions.
+//
+//    2. Redistributions in binary form (compiled executables) must reproduce 
+//       the above copyright notice, definition, disclaimer, and this list of 
+//       conditions in documentation and/or other materials provided with the 
+//       distribution. The sole exception to this condition is redistribution 
+//       of a standard UnZipSFX binary as part of a self-extracting archive; 
+//       that is permitted without inclusion of this license, as long as the 
+//       normal UnZipSFX banner has not been removed from the binary or disabled.
+//
+//    3. Altered versions--including, but not limited to, ports to new 
+//       operating systems, existing ports with new graphical interfaces, and 
+//       dynamic, shared, or static library versions--must be plainly marked 
+//       as such and must not be misrepresented as being the original source.  
+//       Such altered versions also must not be misrepresented as being 
+//       Info-ZIP releases--including, but not limited to, labeling of the 
+//       altered versions with the names "Info-ZIP" (or any variation thereof, 
+//       including, but not limited to, different capitalizations), 
+//       "Pocket UnZip", "WiZ" or "MacZip" without the explicit permission of 
+//       Info-ZIP.  Such altered versions are further prohibited from 
+//       misrepresentative use of the Zip-Bugs or Info-ZIP e-mail addresses or 
+//       of the Info-ZIP URL(s).
+//
+//    4. Info-ZIP retains the right to use the names "Info-ZIP", "Zip", "UnZip",
+//       "UnZipSFX", "WiZ", "Pocket UnZip", "Pocket Zip", and "MacZip" for its 
+//       own source and binary releases.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+#define _USE_32BIT_TIME_T	//+++1.2
+
+
+#define STRICT
+#define WIN32_LEAN_AND_MEAN
+#include <windows.h>
+#include <tchar.h>
+#include <time.h>
+#include "xzip.h"
+
+#pragma warning(disable : 4996)	// disable bogus deprecation warning
+
+typedef unsigned char uch;      // unsigned 8-bit value
+typedef unsigned short ush;     // unsigned 16-bit value
+typedef unsigned long ulg;      // unsigned 32-bit value
+typedef size_t extent;          // file size
+typedef unsigned Pos;   // must be at least 32 bits
+typedef unsigned IPos; // A Pos is an index in the character window. Pos is used only for parameter passing
+
+#ifndef EOF
+#define EOF (-1)
+#endif
+
+
+// Error return values.  The values 0..4 and 12..18 follow the conventions
+// of PKZIP.   The values 4..10 are all assigned to "insufficient memory"
+// by PKZIP, so the codes 5..10 are used here for other purposes.
+#define ZE_MISS         -1      // used by procname(), zipbare()
+#define ZE_OK           0       // success
+#define ZE_EOF          2       // unexpected end of zip file
+#define ZE_FORM         3       // zip file structure error
+#define ZE_MEM          4       // out of memory
+#define ZE_LOGIC        5       // internal logic error
+#define ZE_BIG          6       // entry too large to split
+#define ZE_NOTE         7       // invalid comment format
+#define ZE_TEST         8       // zip test (-T) failed or out of memory
+#define ZE_ABORT        9       // user interrupt or termination
+#define ZE_TEMP         10      // error using a temp file
+#define ZE_READ         11      // read or seek error
+#define ZE_NONE         12      // nothing to do
+#define ZE_NAME         13      // missing or empty zip file
+#define ZE_WRITE        14      // error writing to a file
+#define ZE_CREAT        15      // couldn't open to write
+#define ZE_PARMS        16      // bad command line
+#define ZE_OPEN         18      // could not open a specified file to read
+#define ZE_MAXERR       18      // the highest error number
+
+
+// internal file attribute
+#define UNKNOWN (-1)
+#define BINARY  0
+#define ASCII   1
+
+#define BEST -1                 // Use best method (deflation or store)
+#define STORE 0                 // Store method
+#define DEFLATE 8               // Deflation method
+
+#define CRCVAL_INITIAL  0L
+
+// MSDOS file or directory attributes
+#define MSDOS_HIDDEN_ATTR 0x02
+#define MSDOS_DIR_ATTR 0x10
+
+// Lengths of headers after signatures in bytes
+#define LOCHEAD 26
+#define CENHEAD 42
+#define ENDHEAD 18
+
+// Definitions for extra field handling:
+#define EB_HEADSIZE       4     /* length of a extra field block header */
+#define EB_LEN            2     /* offset of data length field in header */
+#define EB_UT_MINLEN      1     /* minimal UT field contains Flags byte */
+#define EB_UT_FLAGS       0     /* byte offset of Flags field */
+#define EB_UT_TIME1       1     /* byte offset of 1st time value */
+#define EB_UT_FL_MTIME    (1 << 0)      /* mtime present */
+#define EB_UT_FL_ATIME    (1 << 1)      /* atime present */
+#define EB_UT_FL_CTIME    (1 << 2)      /* ctime present */
+#define EB_UT_LEN(n)      (EB_UT_MINLEN + 4 * (n))
+#define EB_L_UT_SIZE    (EB_HEADSIZE + EB_UT_LEN(3))
+#define EB_C_UT_SIZE    (EB_HEADSIZE + EB_UT_LEN(1))
+
+
+// Macros for writing machine integers to little-endian format
+#define PUTSH(a,f) {char _putsh_c=(char)((a)&0xff); wfunc(param,&_putsh_c,1); _putsh_c=(char)((a)>>8); wfunc(param,&_putsh_c,1);}
+#define PUTLG(a,f) {PUTSH((a) & 0xffff,(f)) PUTSH((a) >> 16,(f))}
+
+
+// -- Structure of a ZIP file --
+// Signatures for zip file information headers
+#define LOCSIG     0x04034b50L
+#define CENSIG     0x02014b50L
+#define ENDSIG     0x06054b50L
+#define EXTLOCSIG  0x08074b50L
+
+
+#define MIN_MATCH  3
+#define MAX_MATCH  258
+// The minimum and maximum match lengths
+
+
+#define WSIZE  (0x8000)
+// Maximum window size = 32K. If you are really short of memory, compile
+// with a smaller WSIZE but this reduces the compression ratio for files
+// of size > WSIZE. WSIZE must be a power of two in the current implementation.
+//
+
+#define MIN_LOOKAHEAD (MAX_MATCH+MIN_MATCH+1)
+// Minimum amount of lookahead, except at the end of the input file.
+// See deflate.c for comments about the MIN_MATCH+1.
+//
+
+#define MAX_DIST  (WSIZE-MIN_LOOKAHEAD)
+// In order to simplify the code, particularly on 16 bit machines, match
+// distances are limited to MAX_DIST instead of WSIZE.
+//
+
+
+
+
+
+// ===========================================================================
+// Constants
+//
+
+#define MAX_BITS 15
+// All codes must not exceed MAX_BITS bits
+
+#define MAX_BL_BITS 7
+// Bit length codes must not exceed MAX_BL_BITS bits
+
+#define LENGTH_CODES 29
+// number of length codes, not counting the special END_BLOCK code
+
+#define LITERALS  256
+// number of literal bytes 0..255
+
+#define END_BLOCK 256
+// end of block literal code
+
+#define L_CODES (LITERALS+1+LENGTH_CODES)
+// number of Literal or Length codes, including the END_BLOCK code
+
+#define D_CODES   30
+// number of distance codes
+
+#define BL_CODES  19
+// number of codes used to transfer the bit lengths
+
+
+#define STORED_BLOCK 0
+#define STATIC_TREES 1
+#define DYN_TREES    2
+// The three kinds of block type
+
+#define LIT_BUFSIZE  0x8000
+#define DIST_BUFSIZE  LIT_BUFSIZE
+// Sizes of match buffers for literals/lengths and distances.  There are
+// 4 reasons for limiting LIT_BUFSIZE to 64K:
+//   - frequencies can be kept in 16 bit counters
+//   - if compression is not successful for the first block, all input data is
+//     still in the window so we can still emit a stored block even when input
+//     comes from standard input.  (This can also be done for all blocks if
+//     LIT_BUFSIZE is not greater than 32K.)
+//   - if compression is not successful for a file smaller than 64K, we can
+//     even emit a stored file instead of a stored block (saving 5 bytes).
+//   - creating new Huffman trees less frequently may not provide fast
+//     adaptation to changes in the input data statistics. (Take for
+//     example a binary file with poorly compressible code followed by
+//     a highly compressible string table.) Smaller buffer sizes give
+//     fast adaptation but have of course the overhead of transmitting trees
+//     more frequently.
+//   - I can't count above 4
+// The current code is general and allows DIST_BUFSIZE < LIT_BUFSIZE (to save
+// memory at the expense of compression). Some optimizations would be possible
+// if we rely on DIST_BUFSIZE == LIT_BUFSIZE.
+//
+
+#define REP_3_6      16
+// repeat previous bit length 3-6 times (2 bits of repeat count)
+
+#define REPZ_3_10    17
+// repeat a zero length 3-10 times  (3 bits of repeat count)
+
+#define REPZ_11_138  18
+// repeat a zero length 11-138 times  (7 bits of repeat count)
+
+#define HEAP_SIZE (2*L_CODES+1)
+// maximum heap size
+
+
+// ===========================================================================
+// Local data used by the "bit string" routines.
+//
+
+#define Buf_size (8 * 2*sizeof(char))
+// Number of bits used within bi_buf. (bi_buf may be implemented on
+// more than 16 bits on some systems.)
+
+// Output a 16 bit value to the bit stream, lower (oldest) byte first
+#if 0  // -----------------------------------------------------------
+#define PUTSHORT(state,w) \
+{ \
+	if (state.bs.out_offset >= state.bs.out_size-1) \
+		state.flush_outbuf(state.param,state.bs.out_buf, &state.bs.out_offset); \
+	state.bs.out_buf[state.bs.out_offset++] = (char) ((w) & 0xff); \
+	state.bs.out_buf[state.bs.out_offset++] = (char) ((ush)(w) >> 8); \
+}
+#endif // -----------------------------------------------------------
+
+//+++1.2
+#define PUTSHORT(state,w) \
+{ \
+	if (state.bs.out_offset >= state.bs.out_size-1) \
+		state.flush_outbuf(state.param,state.bs.out_buf, &state.bs.out_offset); \
+	if (state.bs.out_offset < state.bs.out_size-1) \
+	{ \
+		state.bs.out_buf[state.bs.out_offset++] = (char) ((w) & 0xff); \
+		state.bs.out_buf[state.bs.out_offset++] = (char) ((ush)(w) >> 8); \
+	}\
+}
+
+#if 0  // -----------------------------------------------------------
+#define PUTBYTE(state,b) \
+{ \
+	if (state.bs.out_offset >= state.bs.out_size) \
+		state.flush_outbuf(state.param,state.bs.out_buf, &state.bs.out_offset); \
+	state.bs.out_buf[state.bs.out_offset++] = (char) (b); \
+}
+#endif // -----------------------------------------------------------
+
+//+++1.2
+#define PUTBYTE(state,b) \
+{ \
+	if (state.bs.out_offset >= state.bs.out_size) \
+		state.flush_outbuf(state.param,state.bs.out_buf, &state.bs.out_offset); \
+	if (state.bs.out_offset < state.bs.out_size) \
+		state.bs.out_buf[state.bs.out_offset++] = (char) (b); \
+}
+
+// DEFLATE.CPP HEADER
+
+#define HASH_BITS  15
+// For portability to 16 bit machines, do not use values above 15.
+
+#define HASH_SIZE (unsigned)(1<<HASH_BITS)
+#define HASH_MASK (HASH_SIZE-1)
+#define WMASK     (WSIZE-1)
+// HASH_SIZE and WSIZE must be powers of two
+
+#define NIL 0
+// Tail of hash chains
+
+#define FAST 4
+#define SLOW 2
+// speed options for the general purpose bit flag
+
+#define TOO_FAR 4096
+// Matches of length 3 are discarded if their distance exceeds TOO_FAR
+
+
+
+#define EQUAL 0
+// result of memcmp for equal strings
+
+
+// ===========================================================================
+// Local data used by the "longest match" routines.
+
+#define H_SHIFT  ((HASH_BITS+MIN_MATCH-1)/MIN_MATCH)
+// Number of bits by which ins_h and del_h must be shifted at each
+// input step. It must be such that after MIN_MATCH steps, the oldest
+// byte no longer takes part in the hash key, that is:
+//   H_SHIFT * MIN_MATCH >= HASH_BITS
+
+#define max_insert_length  max_lazy_match
+// Insert new strings in the hash table only if the match length
+// is not greater than this length. This saves time but degrades compression.
+// max_insert_length is used only for compression levels <= 3.
+
+
+
+const int extra_lbits[LENGTH_CODES] // extra bits for each length code
+   = {0,0,0,0,0,0,0,0,1,1,1,1,2,2,2,2,3,3,3,3,4,4,4,4,5,5,5,5,0};
+
+const int extra_dbits[D_CODES] // extra bits for each distance code
+   = {0,0,0,0,1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,11,11,12,12,13,13};
+
+const int extra_blbits[BL_CODES]// extra bits for each bit length code
+   = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,2,3,7};
+
+const uch bl_order[BL_CODES] = {16,17,18,0,8,7,9,6,10,5,11,4,12,3,13,2,14,1,15};
+// The lengths of the bit length codes are sent in order of decreasing
+// probability, to avoid transmitting the lengths for unused bit length codes.
+
+
+typedef struct config {
+   ush good_length; // reduce lazy search above this match length
+   ush max_lazy;    // do not perform lazy search above this match length
+   ush nice_length; // quit search above this match length
+   ush max_chain;
+} config;
+
+// Values for max_lazy_match, good_match, nice_match and max_chain_length,
+// depending on the desired pack level (0..9). The values given below have
+// been tuned to exclude worst case performance for pathological files.
+// Better values may be found for specific files.
+//
+
+const config configuration_table[10] = {
+//  good lazy nice chain
+    {0,    0,  0,    0},  // 0 store only
+    {4,    4,  8,    4},  // 1 maximum speed, no lazy matches
+    {4,    5, 16,    8},  // 2
+    {4,    6, 32,   32},  // 3
+    {4,    4, 16,   16},  // 4 lazy matches */
+    {8,   16, 32,   32},  // 5
+    {8,   16, 128, 128},  // 6
+    {8,   32, 128, 256},  // 7
+    {32, 128, 258, 1024}, // 8
+    {32, 258, 258, 4096}};// 9 maximum compression */
+
+// Note: the deflate() code requires max_lazy >= MIN_MATCH and max_chain >= 4
+// For deflate_fast() (levels <= 3) good is ignored and lazy has a different meaning.
+
+
+
+
+
+// Data structure describing a single value and its code string.
+typedef struct ct_data {
+    union {
+        ush  freq;       // frequency count
+        ush  code;       // bit string
+    } fc;
+    union {
+        ush  dad;        // father node in Huffman tree
+        ush  len;        // length of bit string
+    } dl;
+} ct_data;
+
+typedef struct tree_desc 
+{
+    ct_data *dyn_tree;      // the dynamic tree
+    ct_data *static_tree;   // corresponding static tree or NULL
+    const int *extra_bits;  // extra bits for each code or NULL
+    int     extra_base;     // base index for extra_bits
+    int     elems;          // max number of elements in the tree
+    int     max_length;     // max bit length for the codes
+    int     max_code;       // largest code with non zero frequency
+} tree_desc;
+
+
+class TTreeState
+{ 
+public:
+  TTreeState();
+
+  ct_data dyn_ltree[HEAP_SIZE];    // literal and length tree
+  ct_data dyn_dtree[2*D_CODES+1];  // distance tree
+  ct_data static_ltree[L_CODES+2]; // the static literal tree...
+  // ... Since the bit lengths are imposed, there is no need for the L_CODES
+  // extra codes used during heap construction. However the codes 286 and 287
+  // are needed to build a canonical tree (see ct_init below).
+  ct_data static_dtree[D_CODES]; // the static distance tree...
+  // ... (Actually a trivial tree since all codes use 5 bits.)
+  ct_data bl_tree[2*BL_CODES+1];  // Huffman tree for the bit lengths
+
+  tree_desc l_desc;
+  tree_desc d_desc;
+  tree_desc bl_desc;
+
+  ush bl_count[MAX_BITS+1];  // number of codes at each bit length for an optimal tree
+
+  int heap[2*L_CODES+1]; // heap used to build the Huffman trees
+  int heap_len;               // number of elements in the heap
+  int heap_max;               // element of largest frequency
+  // The sons of heap[n] are heap[2*n] and heap[2*n+1]. heap[0] is not used.
+  // The same heap array is used to build all trees.
+
+  uch depth[2*L_CODES+1];
+  // Depth of each subtree used as tie breaker for trees of equal frequency
+
+  uch length_code[MAX_MATCH-MIN_MATCH+1];
+  // length code for each normalized match length (0 == MIN_MATCH)
+
+  uch dist_code[512];
+  // distance codes. The first 256 values correspond to the distances
+  // 3 .. 258, the last 256 values correspond to the top 8 bits of
+  // the 15 bit distances.
+
+  int base_length[LENGTH_CODES];
+  // First normalized length for each code (0 = MIN_MATCH)
+
+  int base_dist[D_CODES];
+  // First normalized distance for each code (0 = distance of 1)
+
+  uch far l_buf[LIT_BUFSIZE];  // buffer for literals/lengths
+  ush far d_buf[DIST_BUFSIZE]; // buffer for distances
+
+  uch flag_buf[(LIT_BUFSIZE/8)];
+  // flag_buf is a bit array distinguishing literals from lengths in
+  // l_buf, and thus indicating the presence or absence of a distance.
+
+  unsigned last_lit;    // running index in l_buf
+  unsigned last_dist;   // running index in d_buf
+  unsigned last_flags;  // running index in flag_buf
+  uch flags;            // current flags not yet saved in flag_buf
+  uch flag_bit;         // current bit used in flags
+  // bits are filled in flags starting at bit 0 (least significant).
+  // Note: these flags are overkill in the current code since we don't
+  // take advantage of DIST_BUFSIZE == LIT_BUFSIZE.
+
+  ulg opt_len;          // bit length of current block with optimal trees
+  ulg static_len;       // bit length of current block with static trees
+
+  ulg cmpr_bytelen;     // total byte length of compressed file
+  ulg cmpr_len_bits;    // number of bits past 'cmpr_bytelen'
+
+  ulg input_len;        // total byte length of input file
+  // input_len is for debugging only since we can get it by other means.
+
+  ush *file_type;       // pointer to UNKNOWN, BINARY or ASCII
+//  int *file_method;     // pointer to DEFLATE or STORE
+};
+
+TTreeState::TTreeState()
+{
+	tree_desc a = {dyn_ltree, static_ltree, extra_lbits, LITERALS+1, L_CODES, MAX_BITS, 0};  l_desc = a;
+	tree_desc b = {dyn_dtree, static_dtree, extra_dbits, 0,          D_CODES, MAX_BITS, 0};  d_desc = b;
+	tree_desc c = {bl_tree, NULL,       extra_blbits, 0,         BL_CODES, MAX_BL_BITS, 0};  bl_desc = c;
+	last_lit = 0;
+	last_dist = 0;
+	last_flags = 0;
+
+	memset(dyn_ltree, 0, sizeof(dyn_ltree));
+	memset(dyn_dtree, 0, sizeof(dyn_dtree));
+	memset(static_ltree, 0, sizeof(static_ltree));
+	memset(static_dtree, 0, sizeof(static_dtree));
+	memset(bl_tree, 0, sizeof(bl_tree));
+	memset(bl_count, 0, sizeof(bl_count));
+	memset(heap, 0, sizeof(heap));
+	heap_len = 0;
+	heap_max = 0;
+
+	memset(depth, 0, sizeof(depth));
+	memset(length_code, 0, sizeof(length_code));
+	memset(dist_code, 0, sizeof(dist_code));
+	memset(base_length, 0, sizeof(base_length));
+	memset(base_dist, 0, sizeof(base_dist));
+	memset(l_buf, 0, sizeof(l_buf));
+	memset(d_buf, 0, sizeof(d_buf));
+	memset(flag_buf, 0, sizeof(flag_buf));
+
+	last_lit = 0;
+	last_dist = 0;
+	last_flags = 0;
+	flags = 0;
+	flag_bit = 0;
+	opt_len = 0;
+	static_len = 0;
+	cmpr_bytelen = 0;
+	cmpr_len_bits = 0;
+	input_len = 0;
+	file_type = 0;
+}
+
+class TBitState
+{ 
+public:
+	TBitState()
+	{
+		flush_flg = 0;
+		bi_buf = 0;
+		bi_valid = 0;
+		out_buf = 0;
+		out_offset = 0;
+		out_size = 0;
+		bits_sent = 0;
+	}
+
+	int flush_flg;
+	//
+	unsigned bi_buf;
+	// Output buffer. bits are inserted starting at the bottom (least significant
+	// bits). The width of bi_buf must be at least 16 bits.
+	int bi_valid;
+	// Number of valid bits in bi_buf.  All bits above the last valid bit
+	// are always zero.
+	char *out_buf;
+	// Current output buffer.
+	unsigned out_offset;
+	// Current offset in output buffer.
+	// On 16 bit machines, the buffer is limited to 64K.
+	unsigned out_size;
+	// Size of current output buffer
+	ulg bits_sent;   // bit length of the compressed data  only needed for debugging???
+};
+
+
+class TDeflateState
+{ 
+public:
+	TDeflateState() 
+	{
+		memset(window, 0, sizeof(window));
+		memset(prev, 0, sizeof(prev));
+		memset(head, 0, sizeof(head));
+		window_size = 0;
+		block_start = 0;
+		sliding = 0;
+		ins_h = 0;
+		prev_length = 0;
+		strstart = 0;
+		match_start = 0; 
+		eofile = 0;
+		lookahead = 0;
+		max_chain_length = 0;
+		max_lazy_match = 0;
+		good_match = 0;
+		nice_match = 0;
+	}
+
+	uch    window[2L*WSIZE];
+	// Sliding window. Input bytes are read into the second half of the window,
+	// and move to the first half later to keep a dictionary of at least WSIZE
+	// bytes. With this organization, matches are limited to a distance of
+	// WSIZE-MAX_MATCH bytes, but this ensures that IO is always
+	// performed with a length multiple of the block size. Also, it limits
+	// the window size to 64K, which is quite useful on MSDOS.
+	// To do: limit the window size to WSIZE+CBSZ if SMALL_MEM (the code would
+	// be less efficient since the data would have to be copied WSIZE/CBSZ times)
+	Pos    prev[WSIZE];
+	// Link to older string with same hash index. To limit the size of this
+	// array to 64K, this link is maintained only for the last 32K strings.
+	// An index in this array is thus a window index modulo 32K.
+	Pos    head[HASH_SIZE];
+	// Heads of the hash chains or NIL. If your compiler thinks that
+	// HASH_SIZE is a dynamic value, recompile with -DDYN_ALLOC.
+
+	ulg window_size;
+	// window size, 2*WSIZE except for MMAP or BIG_MEM, where it is the
+	// input file length plus MIN_LOOKAHEAD.
+
+	long block_start;
+	// window position at the beginning of the current output block. Gets
+	// negative when the window is moved backwards.
+
+	int sliding;
+	// Set to false when the input file is already in memory
+
+	unsigned ins_h;  // hash index of string to be inserted
+
+	unsigned int prev_length;
+	// Length of the best match at previous step. Matches not greater than this
+	// are discarded. This is used in the lazy match evaluation.
+
+	unsigned strstart;         // start of string to insert
+	unsigned match_start; // start of matching string
+	int      eofile;           // flag set at end of input file
+	unsigned lookahead;        // number of valid bytes ahead in window
+
+	unsigned max_chain_length;
+	// To speed up deflation, hash chains are never searched beyond this length.
+	// A higher limit improves compression ratio but degrades the speed.
+
+	unsigned int max_lazy_match;
+	// Attempt to find a better match only when the current match is strictly
+	// smaller than this value. This mechanism is used only for compression
+	// levels >= 4.
+
+	unsigned good_match;
+	// Use a faster search when the previous match is longer than this
+
+	int nice_match; // Stop searching when current match exceeds this
+};
+
+
+typedef struct iztimes {
+  time_t atime,mtime,ctime;
+} iztimes; // access, modify, create times
+
+typedef struct zlist {
+  ush vem, ver, flg, how;       // See central header in zipfile.c for what vem..off are
+  ulg tim, crc, siz, len;
+  extent nam, ext, cext, com;   // offset of ext must be >= LOCHEAD
+  ush dsk, att, lflg;           // offset of lflg must be >= LOCHEAD
+  ulg atx, off;
+  char name[MAX_PATH];                   // File name in zip file
+  char *extra;                  // Extra field (set only if ext != 0)
+  char *cextra;                 // Extra in central (set only if cext != 0)
+  char *comment;                // Comment (set only if com != 0)
+  char iname[MAX_PATH];                  // Internal file name after cleanup
+  char zname[MAX_PATH];                  // External version of internal name
+  int mark;                     // Marker for files to operate on
+  int trash;                    // Marker for files to delete
+  int dosflag;                  // Set to force MSDOS file attributes
+  struct zlist far *nxt;        // Pointer to next header in list
+} TZipFileInfo;
+
+
+class TState;
+typedef unsigned (*READFUNC)(TState &state, char *buf,unsigned size);
+typedef unsigned (*FLUSHFUNC)(void *param, const char *buf, unsigned *size);
+typedef unsigned (*WRITEFUNC)(void *param, const char *buf, unsigned size);
+
+class TState
+{ 
+public: 
+	TState()		//+++1.2
+	{
+		param = 0;
+		level = 0; 
+		seekable = FALSE;
+		readfunc = 0; 
+		flush_outbuf = 0;
+		err = 0;
+	}
+
+	void *param;
+	int level; 
+	bool seekable;
+	READFUNC readfunc; 
+	FLUSHFUNC flush_outbuf;
+	TTreeState ts; 
+	TBitState bs; 
+	TDeflateState ds;
+	const char *err;
+};
+
+void Assert(TState &state,bool cond, const char *msg)
+{ if (cond) return;
+  state.err=msg;
+}
+void __cdecl Trace(const char *x, ...) {va_list paramList; va_start(paramList, x); paramList; va_end(paramList);}
+void __cdecl Tracec(bool ,const char *x, ...) {va_list paramList; va_start(paramList, x); paramList; va_end(paramList);}
+
+// ===========================================================================
+// Local (static) routines in this file.
+//
+
+void init_block     (TState &);
+void pqdownheap     (TState &,ct_data *tree, int k);
+void gen_bitlen     (TState &,tree_desc *desc);
+void gen_codes      (TState &state,ct_data *tree, int max_code);
+void build_tree     (TState &,tree_desc *desc);
+void scan_tree      (TState &,ct_data *tree, int max_code);
+void send_tree      (TState &state,ct_data *tree, int max_code);
+int  build_bl_tree  (TState &);
+void send_all_trees (TState &state,int lcodes, int dcodes, int blcodes);
+void compress_block (TState &state,ct_data *ltree, ct_data *dtree);
+void set_file_type  (TState &);
+void send_bits      (TState &state, int value, int length);
+unsigned bi_reverse (unsigned code, int len);
+void bi_windup      (TState &state);
+void copy_block     (TState &state,char *buf, unsigned len, int header);
+
+
+#define send_code(state, c, tree) send_bits(state, tree[c].fc.code, tree[c].dl.len)
+// Send a code of the given tree. c and tree must not have side effects
+
+// alternatively...
+//#define send_code(state, c, tree)
+//     { if (state.verbose>1) fprintf(stderr,"\ncd %3d ",(c));
+//       send_bits(state, tree[c].fc.code, tree[c].dl.len); }
+
+#define d_code(dist) ((dist) < 256 ? state.ts.dist_code[dist] : state.ts.dist_code[256+((dist)>>7)])
+// Mapping from a distance to a distance code. dist is the distance - 1 and
+// must not have side effects. dist_code[256] and dist_code[257] are never used.
+
+#define Max(a,b) (a >= b ? a : b)
+/* the arguments must not have side effects */
+
+/* ===========================================================================
+ * Allocate the match buffer, initialize the various tables and save the
+ * location of the internal file attribute (ascii/binary) and method
+ * (DEFLATE/STORE).
+ */
+void ct_init(TState &state, ush *attr)
+{
+    int n;        /* iterates over tree elements */
+    int bits;     /* bit counter */
+    int length;   /* length value */
+    int code;     /* code value */
+    int dist;     /* distance index */
+
+    state.ts.file_type = attr;
+    //state.ts.file_method = method;
+    state.ts.cmpr_bytelen = state.ts.cmpr_len_bits = 0L;
+    state.ts.input_len = 0L;
+
+    if (state.ts.static_dtree[0].dl.len != 0) return; /* ct_init already called */
+
+    /* Initialize the mapping length (0..255) -> length code (0..28) */
+    length = 0;
+    for (code = 0; code < LENGTH_CODES-1; code++) {
+        state.ts.base_length[code] = length;
+        for (n = 0; n < (1<<extra_lbits[code]); n++) {
+            state.ts.length_code[length++] = (uch)code;
+        }
+    }
+    Assert(state,length == 256, "ct_init: length != 256");
+    /* Note that the length 255 (match length 258) can be represented
+     * in two different ways: code 284 + 5 bits or code 285, so we
+     * overwrite length_code[255] to use the best encoding:
+     */
+    state.ts.length_code[length-1] = (uch)code;
+
+    /* Initialize the mapping dist (0..32K) -> dist code (0..29) */
+    dist = 0;
+    for (code = 0 ; code < 16; code++) {
+        state.ts.base_dist[code] = dist;
+        for (n = 0; n < (1<<extra_dbits[code]); n++) {
+            state.ts.dist_code[dist++] = (uch)code;
+        }
+    }
+    Assert(state,dist == 256, "ct_init: dist != 256");
+    dist >>= 7; /* from now on, all distances are divided by 128 */
+    for ( ; code < D_CODES; code++) {
+        state.ts.base_dist[code] = dist << 7;
+        for (n = 0; n < (1<<(extra_dbits[code]-7)); n++) {
+            state.ts.dist_code[256 + dist++] = (uch)code;
+        }
+    }
+    Assert(state,dist == 256, "ct_init: 256+dist != 512");
+
+    /* Construct the codes of the static literal tree */
+    for (bits = 0; bits <= MAX_BITS; bits++) state.ts.bl_count[bits] = 0;
+    n = 0;
+    while (n <= 143) state.ts.static_ltree[n++].dl.len = 8, state.ts.bl_count[8]++;
+    while (n <= 255) state.ts.static_ltree[n++].dl.len = 9, state.ts.bl_count[9]++;
+    while (n <= 279) state.ts.static_ltree[n++].dl.len = 7, state.ts.bl_count[7]++;
+    while (n <= 287) state.ts.static_ltree[n++].dl.len = 8, state.ts.bl_count[8]++;
+    /* fc.codes 286 and 287 do not exist, but we must include them in the
+     * tree construction to get a canonical Huffman tree (longest code
+     * all ones)
+     */
+    gen_codes(state,(ct_data *)state.ts.static_ltree, L_CODES+1);
+
+    /* The static distance tree is trivial: */
+    for (n = 0; n < D_CODES; n++) {
+        state.ts.static_dtree[n].dl.len = 5;
+        state.ts.static_dtree[n].fc.code = (ush)bi_reverse(n, 5);
+    }
+
+    /* Initialize the first block of the first file: */
+    init_block(state);
+}
+
+/* ===========================================================================
+ * Initialize a new block.
+ */
+void init_block(TState &state)
+{
+    int n; /* iterates over tree elements */
+
+    /* Initialize the trees. */
+    for (n = 0; n < L_CODES;  n++) state.ts.dyn_ltree[n].fc.freq = 0;
+    for (n = 0; n < D_CODES;  n++) state.ts.dyn_dtree[n].fc.freq = 0;
+    for (n = 0; n < BL_CODES; n++) state.ts.bl_tree[n].fc.freq = 0;
+
+    state.ts.dyn_ltree[END_BLOCK].fc.freq = 1;
+    state.ts.opt_len = state.ts.static_len = 0L;
+    state.ts.last_lit = state.ts.last_dist = state.ts.last_flags = 0;
+    state.ts.flags = 0; state.ts.flag_bit = 1;
+}
+
+#define SMALLEST 1
+/* Index within the heap array of least frequent node in the Huffman tree */
+
+
+/* ===========================================================================
+ * Remove the smallest element from the heap and recreate the heap with
+ * one less element. Updates heap and heap_len.
+ */
+#define pqremove(tree, top) \
+{\
+    top = state.ts.heap[SMALLEST]; \
+    state.ts.heap[SMALLEST] = state.ts.heap[state.ts.heap_len--]; \
+    pqdownheap(state,tree, SMALLEST); \
+}
+
+/* ===========================================================================
+ * Compares to subtrees, using the tree depth as tie breaker when
+ * the subtrees have equal frequency. This minimizes the worst case length.
+ */
+#define smaller(tree, n, m) \
+   (tree[n].fc.freq < tree[m].fc.freq || \
+   (tree[n].fc.freq == tree[m].fc.freq && state.ts.depth[n] <= state.ts.depth[m]))
+
+/* ===========================================================================
+ * Restore the heap property by moving down the tree starting at node k,
+ * exchanging a node with the smallest of its two sons if necessary, stopping
+ * when the heap property is re-established (each father smaller than its
+ * two sons).
+ */
+void pqdownheap(TState &state,ct_data *tree, int k)
+{
+    int v = state.ts.heap[k];
+    int j = k << 1;  /* left son of k */
+    int htemp;       /* required because of bug in SASC compiler */
+
+    while (j <= state.ts.heap_len) {
+        /* Set j to the smallest of the two sons: */
+        if (j < state.ts.heap_len && smaller(tree, state.ts.heap[j+1], state.ts.heap[j])) j++;
+
+        /* Exit if v is smaller than both sons */
+        htemp = state.ts.heap[j];
+        if (smaller(tree, v, htemp)) break;
+
+        /* Exchange v with the smallest son */
+        state.ts.heap[k] = htemp;
+        k = j;
+
+        /* And continue down the tree, setting j to the left son of k */
+        j <<= 1;
+    }
+    state.ts.heap[k] = v;
+}
+
+/* ===========================================================================
+ * Compute the optimal bit lengths for a tree and update the total bit length
+ * for the current block.
+ * IN assertion: the fields freq and dad are set, heap[heap_max] and
+ *    above are the tree nodes sorted by increasing frequency.
+ * OUT assertions: the field len is set to the optimal bit length, the
+ *     array bl_count contains the frequencies for each bit length.
+ *     The length opt_len is updated; static_len is also updated if stree is
+ *     not null.
+ */
+void gen_bitlen(TState &state,tree_desc *desc)
+{
+    ct_data *tree  = desc->dyn_tree;
+    const int *extra     = desc->extra_bits;
+    int base            = desc->extra_base;
+    int max_code        = desc->max_code;
+    int max_length      = desc->max_length;
+    ct_data *stree = desc->static_tree;
+    int h;              /* heap index */
+    int n, m;           /* iterate over the tree elements */
+    int bits;           /* bit length */
+    int xbits;          /* extra bits */
+    ush f;              /* frequency */
+    int overflow = 0;   /* number of elements with bit length too large */
+
+    for (bits = 0; bits <= MAX_BITS; bits++) state.ts.bl_count[bits] = 0;
+
+    /* In a first pass, compute the optimal bit lengths (which may
+     * overflow in the case of the bit length tree).
+     */
+    tree[state.ts.heap[state.ts.heap_max]].dl.len = 0; /* root of the heap */
+
+    for (h = state.ts.heap_max+1; h < HEAP_SIZE; h++) {
+        n = state.ts.heap[h];
+        bits = tree[tree[n].dl.dad].dl.len + 1;
+        if (bits > max_length) bits = max_length, overflow++;
+        tree[n].dl.len = (ush)bits;
+        /* We overwrite tree[n].dl.dad which is no longer needed */
+
+        if (n > max_code) continue; /* not a leaf node */
+
+        state.ts.bl_count[bits]++;
+        xbits = 0;
+        if (n >= base) xbits = extra[n-base];
+        f = tree[n].fc.freq;
+        state.ts.opt_len += (ulg)f * (bits + xbits);
+        if (stree) state.ts.static_len += (ulg)f * (stree[n].dl.len + xbits);
+    }
+    if (overflow == 0) return;
+
+    Trace("\nbit length overflow\n");
+    /* This happens for example on obj2 and pic of the Calgary corpus */
+
+    /* Find the first bit length which could increase: */
+    do {
+        bits = max_length-1;
+        while (state.ts.bl_count[bits] == 0) bits--;
+        state.ts.bl_count[bits]--;           /* move one leaf down the tree */
+        state.ts.bl_count[bits+1] += (ush)2; /* move one overflow item as its brother */
+        state.ts.bl_count[max_length]--;
+        /* The brother of the overflow item also moves one step up,
+         * but this does not affect bl_count[max_length]
+         */
+        overflow -= 2;
+    } while (overflow > 0);
+
+    /* Now recompute all bit lengths, scanning in increasing frequency.
+     * h is still equal to HEAP_SIZE. (It is simpler to reconstruct all
+     * lengths instead of fixing only the wrong ones. This idea is taken
+     * from 'ar' written by Haruhiko Okumura.)
+     */
+    for (bits = max_length; bits != 0; bits--) {
+        n = state.ts.bl_count[bits];
+        while (n != 0) {
+            m = state.ts.heap[--h];
+            if (m > max_code) continue;
+            if (tree[m].dl.len != (ush)bits) {
+                Trace("code %d bits %d->%d\n", m, tree[m].dl.len, bits);
+                state.ts.opt_len += ((long)bits-(long)tree[m].dl.len)*(long)tree[m].fc.freq;
+                tree[m].dl.len = (ush)bits;
+            }
+            n--;
+        }
+    }
+}
+
+/* ===========================================================================
+ * Generate the codes for a given tree and bit counts (which need not be
+ * optimal).
+ * IN assertion: the array bl_count contains the bit length statistics for
+ * the given tree and the field len is set for all tree elements.
+ * OUT assertion: the field code is set for all tree elements of non
+ *     zero code length.
+ */
+void gen_codes (TState &state, ct_data *tree, int max_code)
+{
+    ush next_code[MAX_BITS+1]; /* next code value for each bit length */
+    ush code = 0;              /* running code value */
+    int bits;                  /* bit index */
+    int n;                     /* code index */
+
+    /* The distribution counts are first used to generate the code values
+     * without bit reversal.
+     */
+    for (bits = 1; bits <= MAX_BITS; bits++) {
+        next_code[bits] = code = (ush)((code + state.ts.bl_count[bits-1]) << 1);
+    }
+    /* Check that the bit counts in bl_count are consistent. The last code
+     * must be all ones.
+     */
+    Assert(state,code + state.ts.bl_count[MAX_BITS]-1 == (1<< ((ush) MAX_BITS)) - 1,
+            "inconsistent bit counts");
+    Trace("\ngen_codes: max_code %d ", max_code);
+
+    for (n = 0;  n <= max_code; n++) {
+        int len = tree[n].dl.len;
+        if (len == 0) continue;
+        /* Now reverse the bits */
+        tree[n].fc.code = (ush)bi_reverse(next_code[len]++, len);
+
+        //Tracec(tree != state.ts.static_ltree, "\nn %3d %c l %2d c %4x (%x) ", n, (isgraph(n) ? n : ' '), len, tree[n].fc.code, next_code[len]-1);
+    }
+}
+
+/* ===========================================================================
+ * Construct one Huffman tree and assigns the code bit strings and lengths.
+ * Update the total bit length for the current block.
+ * IN assertion: the field freq is set for all tree elements.
+ * OUT assertions: the fields len and code are set to the optimal bit length
+ *     and corresponding code. The length opt_len is updated; static_len is
+ *     also updated if stree is not null. The field max_code is set.
+ */
+void build_tree(TState &state,tree_desc *desc)
+{
+    ct_data *tree   = desc->dyn_tree;
+    ct_data *stree  = desc->static_tree;
+    int elems            = desc->elems;
+    int n, m;          /* iterate over heap elements */
+    int max_code = -1; /* largest code with non zero frequency */
+    int node = elems;  /* next internal node of the tree */
+
+    /* Construct the initial heap, with least frequent element in
+     * heap[SMALLEST]. The sons of heap[n] are heap[2*n] and heap[2*n+1].
+     * heap[0] is not used.
+     */
+    state.ts.heap_len = 0, state.ts.heap_max = HEAP_SIZE;
+
+    for (n = 0; n < elems; n++) {
+        if (tree[n].fc.freq != 0) {
+            state.ts.heap[++state.ts.heap_len] = max_code = n;
+            state.ts.depth[n] = 0;
+        } else {
+            tree[n].dl.len = 0;
+        }
+    }
+
+    /* The pkzip format requires that at least one distance code exists,
+     * and that at least one bit should be sent even if there is only one
+     * possible code. So to avoid special checks later on we force at least
+     * two codes of non zero frequency.
+     */
+    while (state.ts.heap_len < 2) {
+        int newcp = state.ts.heap[++state.ts.heap_len] = (max_code < 2 ? ++max_code : 0);
+        tree[newcp].fc.freq = 1;
+        state.ts.depth[newcp] = 0;
+        state.ts.opt_len--; if (stree) state.ts.static_len -= stree[newcp].dl.len;
+        /* new is 0 or 1 so it does not have extra bits */
+    }
+    desc->max_code = max_code;
+
+    /* The elements heap[heap_len/2+1 .. heap_len] are leaves of the tree,
+     * establish sub-heaps of increasing lengths:
+     */
+    for (n = state.ts.heap_len/2; n >= 1; n--) pqdownheap(state,tree, n);
+
+    /* Construct the Huffman tree by repeatedly combining the least two
+     * frequent nodes.
+     */
+    do {
+        pqremove(tree, n);   /* n = node of least frequency */
+        m = state.ts.heap[SMALLEST];  /* m = node of next least frequency */
+
+        state.ts.heap[--state.ts.heap_max] = n; /* keep the nodes sorted by frequency */
+        state.ts.heap[--state.ts.heap_max] = m;
+
+        /* Create a new node father of n and m */
+        tree[node].fc.freq = (ush)(tree[n].fc.freq + tree[m].fc.freq);
+        state.ts.depth[node] = (uch) (Max(state.ts.depth[n], state.ts.depth[m]) + 1);
+        tree[n].dl.dad = tree[m].dl.dad = (ush)node;
+        /* and insert the new node in the heap */
+        state.ts.heap[SMALLEST] = node++;
+        pqdownheap(state,tree, SMALLEST);
+
+    } while (state.ts.heap_len >= 2);
+
+    state.ts.heap[--state.ts.heap_max] = state.ts.heap[SMALLEST];
+
+    /* At this point, the fields freq and dad are set. We can now
+     * generate the bit lengths.
+     */
+    gen_bitlen(state,(tree_desc *)desc);
+
+    /* The field len is now set, we can generate the bit codes */
+    gen_codes (state,(ct_data *)tree, max_code);
+}
+
+/* ===========================================================================
+ * Scan a literal or distance tree to determine the frequencies of the codes
+ * in the bit length tree. Updates opt_len to take into account the repeat
+ * counts. (The contribution of the bit length codes will be added later
+ * during the construction of bl_tree.)
+ */
+void scan_tree (TState &state,ct_data *tree, int max_code)
+{
+    int n;                     /* iterates over all tree elements */
+    int prevlen = -1;          /* last emitted length */
+    int curlen;                /* length of current code */
+    int nextlen = tree[0].dl.len; /* length of next code */
+    int count = 0;             /* repeat count of the current code */
+    int max_count = 7;         /* max repeat count */
+    int min_count = 4;         /* min repeat count */
+
+    if (nextlen == 0) max_count = 138, min_count = 3;
+    tree[max_code+1].dl.len = (ush)-1; /* guard */
+
+    for (n = 0; n <= max_code; n++) {
+        curlen = nextlen; nextlen = tree[n+1].dl.len;
+        if (++count < max_count && curlen == nextlen) {
+            continue;
+        } else if (count < min_count) {
+            state.ts.bl_tree[curlen].fc.freq = (ush)(state.ts.bl_tree[curlen].fc.freq + count);
+        } else if (curlen != 0) {
+            if (curlen != prevlen) state.ts.bl_tree[curlen].fc.freq++;
+            state.ts.bl_tree[REP_3_6].fc.freq++;
+        } else if (count <= 10) {
+            state.ts.bl_tree[REPZ_3_10].fc.freq++;
+        } else {
+            state.ts.bl_tree[REPZ_11_138].fc.freq++;
+        }
+        count = 0; prevlen = curlen;
+        if (nextlen == 0) {
+            max_count = 138, min_count = 3;
+        } else if (curlen == nextlen) {
+            max_count = 6, min_count = 3;
+        } else {
+            max_count = 7, min_count = 4;
+        }
+    }
+}
+
+/* ===========================================================================
+ * Send a literal or distance tree in compressed form, using the codes in
+ * bl_tree.
+ */
+void send_tree (TState &state, ct_data *tree, int max_code)
+{
+    int n;                     /* iterates over all tree elements */
+    int prevlen = -1;          /* last emitted length */
+    int curlen;                /* length of current code */
+    int nextlen = tree[0].dl.len; /* length of next code */
+    int count = 0;             /* repeat count of the current code */
+    int max_count = 7;         /* max repeat count */
+    int min_count = 4;         /* min repeat count */
+
+    /* tree[max_code+1].dl.len = -1; */  /* guard already set */
+    if (nextlen == 0) max_count = 138, min_count = 3;
+
+    for (n = 0; n <= max_code; n++) {
+        curlen = nextlen; nextlen = tree[n+1].dl.len;
+        if (++count < max_count && curlen == nextlen) {
+            continue;
+        } else if (count < min_count) {
+            do { send_code(state, curlen, state.ts.bl_tree); } while (--count != 0);
+
+        } else if (curlen != 0) {
+            if (curlen != prevlen) {
+                send_code(state, curlen, state.ts.bl_tree); count--;
+            }
+            Assert(state,count >= 3 && count <= 6, " 3_6?");
+            send_code(state,REP_3_6, state.ts.bl_tree); send_bits(state,count-3, 2);
+
+        } else if (count <= 10) {
+            send_code(state,REPZ_3_10, state.ts.bl_tree); send_bits(state,count-3, 3);
+
+        } else {
+            send_code(state,REPZ_11_138, state.ts.bl_tree); send_bits(state,count-11, 7);
+        }
+        count = 0; prevlen = curlen;
+        if (nextlen == 0) {
+            max_count = 138, min_count = 3;
+        } else if (curlen == nextlen) {
+            max_count = 6, min_count = 3;
+        } else {
+            max_count = 7, min_count = 4;
+        }
+    }
+}
+
+/* ===========================================================================
+ * Construct the Huffman tree for the bit lengths and return the index in
+ * bl_order of the last bit length code to send.
+ */
+int build_bl_tree(TState &state)
+{
+    int max_blindex;  /* index of last bit length code of non zero freq */
+
+    /* Determine the bit length frequencies for literal and distance trees */
+    scan_tree(state,(ct_data *)state.ts.dyn_ltree, state.ts.l_desc.max_code);
+    scan_tree(state,(ct_data *)state.ts.dyn_dtree, state.ts.d_desc.max_code);
+
+    /* Build the bit length tree: */
+    build_tree(state,(tree_desc *)(&state.ts.bl_desc));
+    /* opt_len now includes the length of the tree representations, except
+     * the lengths of the bit lengths codes and the 5+5+4 bits for the counts.
+     */
+
+    /* Determine the number of bit length codes to send. The pkzip format
+     * requires that at least 4 bit length codes be sent. (appnote.txt says
+     * 3 but the actual value used is 4.)
+     */
+    for (max_blindex = BL_CODES-1; max_blindex >= 3; max_blindex--) {
+        if (state.ts.bl_tree[bl_order[max_blindex]].dl.len != 0) break;
+    }
+    /* Update opt_len to include the bit length tree and counts */
+    state.ts.opt_len += 3*(max_blindex+1) + 5+5+4;
+    Trace("\ndyn trees: dyn %ld, stat %ld", state.ts.opt_len, state.ts.static_len);
+
+    return max_blindex;
+}
+
+/* ===========================================================================
+ * Send the header for a block using dynamic Huffman trees: the counts, the
+ * lengths of the bit length codes, the literal tree and the distance tree.
+ * IN assertion: lcodes >= 257, dcodes >= 1, blcodes >= 4.
+ */
+void send_all_trees(TState &state,int lcodes, int dcodes, int blcodes)
+{
+    int rank;                    /* index in bl_order */
+
+    Assert(state,lcodes >= 257 && dcodes >= 1 && blcodes >= 4, "not enough codes");
+    Assert(state,lcodes <= L_CODES && dcodes <= D_CODES && blcodes <= BL_CODES,
+            "too many codes");
+    Trace("\nbl counts: ");
+    send_bits(state,lcodes-257, 5);
+    /* not +255 as stated in appnote.txt 1.93a or -256 in 2.04c */
+    send_bits(state,dcodes-1,   5);
+    send_bits(state,blcodes-4,  4); /* not -3 as stated in appnote.txt */
+    for (rank = 0; rank < blcodes; rank++) {
+        Trace("\nbl code %2d ", bl_order[rank]);
+        send_bits(state,state.ts.bl_tree[bl_order[rank]].dl.len, 3);
+    }    
+    Trace("\nbl tree: sent %ld", state.bs.bits_sent);
+
+    send_tree(state,(ct_data *)state.ts.dyn_ltree, lcodes-1); /* send the literal tree */
+    Trace("\nlit tree: sent %ld", state.bs.bits_sent);
+
+    send_tree(state,(ct_data *)state.ts.dyn_dtree, dcodes-1); /* send the distance tree */
+    Trace("\ndist tree: sent %ld", state.bs.bits_sent);
+}
+
+/* ===========================================================================
+ * Determine the best encoding for the current block: dynamic trees, static
+ * trees or store, and output the encoded block to the zip file. This function
+ * returns the total compressed length (in bytes) for the file so far.
+ */
+ulg flush_block(TState &state,char *buf, ulg stored_len, int eof)
+{
+    ulg opt_lenb, static_lenb; /* opt_len and static_len in bytes */
+    int max_blindex;  /* index of last bit length code of non zero freq */
+
+    state.ts.flag_buf[state.ts.last_flags] = state.ts.flags; /* Save the flags for the last 8 items */
+
+     /* Check if the file is ascii or binary */
+    if (*state.ts.file_type == (ush)UNKNOWN) set_file_type(state);
+
+    /* Construct the literal and distance trees */
+    build_tree(state,(tree_desc *)(&state.ts.l_desc));
+    Trace("\nlit data: dyn %ld, stat %ld", state.ts.opt_len, state.ts.static_len);
+
+    build_tree(state,(tree_desc *)(&state.ts.d_desc));
+    Trace("\ndist data: dyn %ld, stat %ld", state.ts.opt_len, state.ts.static_len);
+    /* At this point, opt_len and static_len are the total bit lengths of
+     * the compressed block data, excluding the tree representations.
+     */
+
+    /* Build the bit length tree for the above two trees, and get the index
+     * in bl_order of the last bit length code to send.
+     */
+    max_blindex = build_bl_tree(state);
+
+    /* Determine the best encoding. Compute first the block length in bytes */
+    opt_lenb = (state.ts.opt_len+3+7)>>3;
+    static_lenb = (state.ts.static_len+3+7)>>3;
+    state.ts.input_len += stored_len; /* for debugging only */
+
+    Trace("\nopt %lu(%lu) stat %lu(%lu) stored %lu lit %u dist %u ",
+            opt_lenb, state.ts.opt_len, static_lenb, state.ts.static_len, stored_len,
+            state.ts.last_lit, state.ts.last_dist);
+
+    if (static_lenb <= opt_lenb) opt_lenb = static_lenb;
+
+    // Originally, zip allowed the file to be transformed from a compressed
+    // into a stored file in the case where compression failed, there
+    // was only one block, and it was allowed to change. I've removed this
+    // possibility since the code's cleaner if no changes are allowed.
+    //if (stored_len <= opt_lenb && eof && state.ts.cmpr_bytelen == 0L
+    //   && state.ts.cmpr_len_bits == 0L && state.seekable)
+    //{   // && state.ts.file_method != NULL
+    //    // Since LIT_BUFSIZE <= 2*WSIZE, the input data must be there:
+    //    Assert(state,buf!=NULL,"block vanished");
+    //    copy_block(state,buf, (unsigned)stored_len, 0); // without header
+    //    state.ts.cmpr_bytelen = stored_len;
+    //    Assert(state,false,"unimplemented *state.ts.file_method = STORE;");
+    //    //*state.ts.file_method = STORE;
+    //}
+    //else
+    if (stored_len+4 <= opt_lenb && buf != (char*)NULL) {
+                       /* 4: two words for the lengths */
+        /* The test buf != NULL is only necessary if LIT_BUFSIZE > WSIZE.
+         * Otherwise we can't have processed more than WSIZE input bytes since
+         * the last block flush, because compression would have been
+         * successful. If LIT_BUFSIZE <= WSIZE, it is never too late to
+         * transform a block into a stored block.
+         */
+        send_bits(state,(STORED_BLOCK<<1)+eof, 3);  /* send block type */
+        state.ts.cmpr_bytelen += ((state.ts.cmpr_len_bits + 3 + 7) >> 3) + stored_len + 4;
+        state.ts.cmpr_len_bits = 0L;
+
+        copy_block(state,buf, (unsigned)stored_len, 1); /* with header */
+    }
+    else if (static_lenb == opt_lenb) {
+        send_bits(state,(STATIC_TREES<<1)+eof, 3);
+        compress_block(state,(ct_data *)state.ts.static_ltree, (ct_data *)state.ts.static_dtree);
+        state.ts.cmpr_len_bits += 3 + state.ts.static_len;
+        state.ts.cmpr_bytelen += state.ts.cmpr_len_bits >> 3;
+        state.ts.cmpr_len_bits &= 7L;
+    }
+    else {
+        send_bits(state,(DYN_TREES<<1)+eof, 3);
+        send_all_trees(state,state.ts.l_desc.max_code+1, state.ts.d_desc.max_code+1, max_blindex+1);
+        compress_block(state,(ct_data *)state.ts.dyn_ltree, (ct_data *)state.ts.dyn_dtree);
+        state.ts.cmpr_len_bits += 3 + state.ts.opt_len;
+        state.ts.cmpr_bytelen += state.ts.cmpr_len_bits >> 3;
+        state.ts.cmpr_len_bits &= 7L;
+    }
+    Assert(state,((state.ts.cmpr_bytelen << 3) + state.ts.cmpr_len_bits) == state.bs.bits_sent, "bad compressed size");
+    init_block(state);
+
+    if (eof) {
+        // Assert(state,input_len == isize, "bad input size");
+        bi_windup(state);
+        state.ts.cmpr_len_bits += 7;  /* align on byte boundary */
+    }
+    Trace("\n");
+
+    return state.ts.cmpr_bytelen + (state.ts.cmpr_len_bits >> 3);
+}
+
+/* ===========================================================================
+ * Save the match info and tally the frequency counts. Return true if
+ * the current block must be flushed.
+ */
+int ct_tally (TState &state,int dist, int lc)
+{
+    state.ts.l_buf[state.ts.last_lit++] = (uch)lc;
+    if (dist == 0) {
+        /* lc is the unmatched char */
+        state.ts.dyn_ltree[lc].fc.freq++;
+    } else {
+        /* Here, lc is the match length - MIN_MATCH */
+        dist--;             /* dist = match distance - 1 */
+        Assert(state,(ush)dist < (ush)MAX_DIST &&
+               (ush)lc <= (ush)(MAX_MATCH-MIN_MATCH) &&
+               (ush)d_code(dist) < (ush)D_CODES,  "ct_tally: bad match");
+
+        state.ts.dyn_ltree[state.ts.length_code[lc]+LITERALS+1].fc.freq++;
+        state.ts.dyn_dtree[d_code(dist)].fc.freq++;
+
+        state.ts.d_buf[state.ts.last_dist++] = (ush)dist;
+        state.ts.flags |= state.ts.flag_bit;
+    }
+    state.ts.flag_bit <<= 1;
+
+    /* Output the flags if they fill a byte: */
+    if ((state.ts.last_lit & 7) == 0) {
+        state.ts.flag_buf[state.ts.last_flags++] = state.ts.flags;
+        state.ts.flags = 0, state.ts.flag_bit = 1;
+    }
+    /* Try to guess if it is profitable to stop the current block here */
+    if (state.level > 2 && (state.ts.last_lit & 0xfff) == 0) {
+        /* Compute an upper bound for the compressed length */
+        ulg out_length = (ulg)state.ts.last_lit*8L;
+        ulg in_length = (ulg)state.ds.strstart-state.ds.block_start;
+        int dcode;
+        for (dcode = 0; dcode < D_CODES; dcode++) {
+            out_length += (ulg)state.ts.dyn_dtree[dcode].fc.freq*(5L+extra_dbits[dcode]);
+        }
+        out_length >>= 3;
+        Trace("\nlast_lit %u, last_dist %u, in %ld, out ~%ld(%ld%%) ",
+               state.ts.last_lit, state.ts.last_dist, in_length, out_length,
+               100L - out_length*100L/in_length);
+        if (state.ts.last_dist < state.ts.last_lit/2 && out_length < in_length/2) return 1;
+    }
+    return (state.ts.last_lit == LIT_BUFSIZE-1 || state.ts.last_dist == DIST_BUFSIZE);
+    /* We avoid equality with LIT_BUFSIZE because of wraparound at 64K
+     * on 16 bit machines and because stored blocks are restricted to
+     * 64K-1 bytes.
+     */
+}
+
+/* ===========================================================================
+ * Send the block data compressed using the given Huffman trees
+ */
+void compress_block(TState &state,ct_data *ltree, ct_data *dtree)
+{
+    unsigned dist;      /* distance of matched string */
+    int lc;             /* match length or unmatched char (if dist == 0) */
+    unsigned lx = 0;    /* running index in l_buf */
+    unsigned dx = 0;    /* running index in d_buf */
+    unsigned fx = 0;    /* running index in flag_buf */
+    uch flag = 0;       /* current flags */
+    unsigned code;      /* the code to send */
+    int extra;          /* number of extra bits to send */
+
+    if (state.ts.last_lit != 0) do {
+        if ((lx & 7) == 0) flag = state.ts.flag_buf[fx++];
+        lc = state.ts.l_buf[lx++];
+        if ((flag & 1) == 0) {
+            send_code(state,lc, ltree); /* send a literal byte */
+        } else {
+            /* Here, lc is the match length - MIN_MATCH */
+            code = state.ts.length_code[lc];
+            send_code(state,code+LITERALS+1, ltree); /* send the length code */
+            extra = extra_lbits[code];
+            if (extra != 0) {
+                lc -= state.ts.base_length[code];
+                send_bits(state,lc, extra);        /* send the extra length bits */
+            }
+            dist = state.ts.d_buf[dx++];
+            /* Here, dist is the match distance - 1 */
+            code = d_code(dist);
+            Assert(state,code < D_CODES, "bad d_code");
+
+            send_code(state,code, dtree);       /* send the distance code */
+            extra = extra_dbits[code];
+            if (extra != 0) {
+                dist -= state.ts.base_dist[code];
+                send_bits(state,dist, extra);   /* send the extra distance bits */
+            }
+        } /* literal or match pair ? */
+        flag >>= 1;
+    } while (lx < state.ts.last_lit);
+
+    send_code(state,END_BLOCK, ltree);
+}
+
+/* ===========================================================================
+ * Set the file type to ASCII or BINARY, using a crude approximation:
+ * binary if more than 20% of the bytes are <= 6 or >= 128, ascii otherwise.
+ * IN assertion: the fields freq of dyn_ltree are set and the total of all
+ * frequencies does not exceed 64K (to fit in an int on 16 bit machines).
+ */
+void set_file_type(TState &state)
+{
+    int n = 0;
+    unsigned ascii_freq = 0;
+    unsigned bin_freq = 0;
+    while (n < 7)        bin_freq += state.ts.dyn_ltree[n++].fc.freq;
+    while (n < 128)    ascii_freq += state.ts.dyn_ltree[n++].fc.freq;
+    while (n < LITERALS) bin_freq += state.ts.dyn_ltree[n++].fc.freq;
+    *state.ts.file_type = (ush)(bin_freq > (ascii_freq >> 2) ? BINARY : ASCII);
+}
+
+
+/* ===========================================================================
+ * Initialize the bit string routines.
+ */
+void bi_init (TState &state,char *tgt_buf, unsigned tgt_size, int flsh_allowed)
+{
+    state.bs.out_buf = tgt_buf;
+    state.bs.out_size = tgt_size;
+    state.bs.out_offset = 0;
+    state.bs.flush_flg = flsh_allowed;
+
+    state.bs.bi_buf = 0;
+    state.bs.bi_valid = 0;
+    state.bs.bits_sent = 0L;
+}
+
+/* ===========================================================================
+ * Send a value on a given number of bits.
+ * IN assertion: length <= 16 and value fits in length bits.
+ */
+void send_bits(TState &state,int value, int length)
+{
+    Assert(state,length > 0 && length <= 15, "invalid length");
+    state.bs.bits_sent += (ulg)length;
+    /* If not enough room in bi_buf, use (bi_valid) bits from bi_buf and
+     * (Buf_size - bi_valid) bits from value to flush the filled bi_buf,
+     * then fill in the rest of (value), leaving (length - (Buf_size-bi_valid))
+     * unused bits in bi_buf.
+     */
+    state.bs.bi_buf |= (value << state.bs.bi_valid);
+    state.bs.bi_valid += length;
+    if (state.bs.bi_valid > (int)Buf_size) {
+        PUTSHORT(state,state.bs.bi_buf);
+        state.bs.bi_valid -= Buf_size;
+        state.bs.bi_buf = (unsigned)value >> (length - state.bs.bi_valid);
+    }
+}
+
+/* ===========================================================================
+ * Reverse the first len bits of a code, using straightforward code (a faster
+ * method would use a table)
+ * IN assertion: 1 <= len <= 15
+ */
+unsigned bi_reverse(unsigned code, int len)
+{
+    register unsigned res = 0;
+    do {
+        res |= code & 1;
+        code >>= 1, res <<= 1;
+    } while (--len > 0);
+    return res >> 1;
+}
+
+/* ===========================================================================
+ * Write out any remaining bits in an incomplete byte.
+ */
+void bi_windup(TState &state)
+{
+    if (state.bs.bi_valid > 8) {
+        PUTSHORT(state,state.bs.bi_buf);
+    } else if (state.bs.bi_valid > 0) {
+        PUTBYTE(state,state.bs.bi_buf);
+    }
+    if (state.bs.flush_flg) {
+        state.flush_outbuf(state.param,state.bs.out_buf, &state.bs.out_offset);
+    }
+    state.bs.bi_buf = 0;
+    state.bs.bi_valid = 0;
+    state.bs.bits_sent = (state.bs.bits_sent+7) & ~7;
+}
+
+/* ===========================================================================
+ * Copy a stored block to the zip file, storing first the length and its
+ * one's complement if requested.
+ */
+void copy_block(TState &state, char *block, unsigned len, int header)
+{
+    bi_windup(state);              /* align on byte boundary */
+
+    if (header) {
+        PUTSHORT(state,(ush)len);
+        PUTSHORT(state,(ush)~len);
+        state.bs.bits_sent += 2*16;
+    }
+    if (state.bs.flush_flg) {
+        state.flush_outbuf(state.param,state.bs.out_buf, &state.bs.out_offset);
+        state.bs.out_offset = len;
+        state.flush_outbuf(state.param,block, &state.bs.out_offset);
+    } else if (state.bs.out_offset + len > state.bs.out_size) {
+        Assert(state,false,"output buffer too small for in-memory compression");
+    } else {
+        memcpy(state.bs.out_buf + state.bs.out_offset, block, len);
+        state.bs.out_offset += len;
+    }
+    state.bs.bits_sent += (ulg)len<<3;
+}
+
+
+
+
+
+
+
+
+/* ===========================================================================
+ *  Prototypes for functions.
+ */
+
+void fill_window  (TState &state);
+ulg deflate_fast  (TState &state);
+
+int  longest_match (TState &state,IPos cur_match);
+
+
+/* ===========================================================================
+ * Update a hash value with the given input byte
+ * IN  assertion: all calls to to UPDATE_HASH are made with consecutive
+ *    input characters, so that a running hash key can be computed from the
+ *    previous key instead of complete recalculation each time.
+ */
+#define UPDATE_HASH(h,c) (h = (((h)<<H_SHIFT) ^ (c)) & HASH_MASK)
+
+/* ===========================================================================
+ * Insert string s in the dictionary and set match_head to the previous head
+ * of the hash chain (the most recent string with same hash key). Return
+ * the previous length of the hash chain.
+ * IN  assertion: all calls to to INSERT_STRING are made with consecutive
+ *    input characters and the first MIN_MATCH bytes of s are valid
+ *    (except for the last MIN_MATCH-1 bytes of the input file).
+ */
+#define INSERT_STRING(s, match_head) \
+   (UPDATE_HASH(state.ds.ins_h, state.ds.window[(s) + (MIN_MATCH-1)]), \
+    state.ds.prev[(s) & WMASK] = match_head = state.ds.head[state.ds.ins_h], \
+    state.ds.head[state.ds.ins_h] = (s))
+
+/* ===========================================================================
+ * Initialize the "longest match" routines for a new file
+ *
+ * IN assertion: window_size is > 0 if the input file is already read or
+ *    mmap'ed in the window[] array, 0 otherwise. In the first case,
+ *    window_size is sufficient to contain the whole input file plus
+ *    MIN_LOOKAHEAD bytes (to avoid referencing memory beyond the end
+ *    of window[] when looking for matches towards the end).
+ */
+void lm_init (TState &state, int pack_level, ush *flags)
+{
+    register unsigned j;
+
+    Assert(state,pack_level>=1 && pack_level<=8,"bad pack level");
+
+    /* Do not slide the window if the whole input is already in memory
+     * (window_size > 0)
+     */
+    state.ds.sliding = 0;
+    if (state.ds.window_size == 0L) {
+        state.ds.sliding = 1;
+        state.ds.window_size = (ulg)2L*WSIZE;
+    }
+
+    /* Initialize the hash table (avoiding 64K overflow for 16 bit systems).
+     * prev[] will be initialized on the fly.
+     */
+    state.ds.head[HASH_SIZE-1] = NIL;
+    memset((char*)state.ds.head, NIL, (unsigned)(HASH_SIZE-1)*sizeof(*state.ds.head));
+
+    /* Set the default configuration parameters:
+     */
+    state.ds.max_lazy_match   = configuration_table[pack_level].max_lazy;
+    state.ds.good_match       = configuration_table[pack_level].good_length;
+    state.ds.nice_match       = configuration_table[pack_level].nice_length;
+    state.ds.max_chain_length = configuration_table[pack_level].max_chain;
+    if (pack_level <= 2) {
+       *flags |= FAST;
+    } else if (pack_level >= 8) {
+       *flags |= SLOW;
+    }
+    /* ??? reduce max_chain_length for binary files */
+
+    state.ds.strstart = 0;
+    state.ds.block_start = 0L;
+
+    j = WSIZE;
+    j <<= 1; // Can read 64K in one step
+    state.ds.lookahead = state.readfunc(state, (char*)state.ds.window, j);
+
+    if (state.ds.lookahead == 0 || state.ds.lookahead == (unsigned)EOF) {
+       state.ds.eofile = 1, state.ds.lookahead = 0;
+       return;
+    }
+    state.ds.eofile = 0;
+    /* Make sure that we always have enough lookahead. This is important
+     * if input comes from a device such as a tty.
+     */
+    if (state.ds.lookahead < MIN_LOOKAHEAD) fill_window(state);
+
+    state.ds.ins_h = 0;
+    for (j=0; j<MIN_MATCH-1; j++) UPDATE_HASH(state.ds.ins_h, state.ds.window[j]);
+    /* If lookahead < MIN_MATCH, ins_h is garbage, but this is
+     * not important since only literal bytes will be emitted.
+     */
+}
+
+
+/* ===========================================================================
+ * Set match_start to the longest match starting at the given string and
+ * return its length. Matches shorter or equal to prev_length are discarded,
+ * in which case the result is equal to prev_length and match_start is
+ * garbage.
+ * IN assertions: cur_match is the head of the hash chain for the current
+ *   string (strstart) and its distance is <= MAX_DIST, and prev_length >= 1
+ */
+// For 80x86 and 680x0 and ARM, an optimized version is in match.asm or
+// match.S. The code is functionally equivalent, so you can use the C version
+// if desired. Which I do so desire!
+int longest_match(TState &state,IPos cur_match)
+{
+    unsigned chain_length = state.ds.max_chain_length;   /* max hash chain length */
+    register uch far *scan = state.ds.window + state.ds.strstart; /* current string */
+    register uch far *match;                    /* matched string */
+    register int len;                           /* length of current match */
+    int best_len = state.ds.prev_length;                 /* best match length so far */
+    IPos limit = state.ds.strstart > (IPos)MAX_DIST ? state.ds.strstart - (IPos)MAX_DIST : NIL;
+    /* Stop when cur_match becomes <= limit. To simplify the code,
+     * we prevent matches with the string of window index 0.
+     */
+
+  // The code is optimized for HASH_BITS >= 8 and MAX_MATCH-2 multiple of 16.
+  // It is easy to get rid of this optimization if necessary.
+    Assert(state,HASH_BITS>=8 && MAX_MATCH==258,"Code too clever");
+
+
+
+    register uch far *strend = state.ds.window + state.ds.strstart + MAX_MATCH;
+    register uch scan_end1  = scan[best_len-1];
+    register uch scan_end   = scan[best_len];
+
+    /* Do not waste too much time if we already have a good match: */
+    if (state.ds.prev_length >= state.ds.good_match) {
+        chain_length >>= 2;
+    }
+
+    Assert(state,state.ds.strstart <= state.ds.window_size-MIN_LOOKAHEAD, "insufficient lookahead");
+
+    do {
+        Assert(state,cur_match < state.ds.strstart, "no future");
+        match = state.ds.window + cur_match;
+
+        /* Skip to next match if the match length cannot increase
+         * or if the match length is less than 2:
+         */
+        if (match[best_len]   != scan_end  ||
+            match[best_len-1] != scan_end1 ||
+            *match            != *scan     ||
+            *++match          != scan[1])      continue;
+
+        /* The check at best_len-1 can be removed because it will be made
+         * again later. (This heuristic is not always a win.)
+         * It is not necessary to compare scan[2] and match[2] since they
+         * are always equal when the other bytes match, given that
+         * the hash keys are equal and that HASH_BITS >= 8.
+         */
+        scan += 2, match++;
+
+        /* We check for insufficient lookahead only every 8th comparison;
+         * the 256th check will be made at strstart+258.
+         */
+        do {
+        } while (*++scan == *++match && *++scan == *++match &&
+                 *++scan == *++match && *++scan == *++match &&
+                 *++scan == *++match && *++scan == *++match &&
+                 *++scan == *++match && *++scan == *++match &&
+                 scan < strend);
+
+        Assert(state,scan <= state.ds.window+(unsigned)(state.ds.window_size-1), "wild scan");
+                          
+        len = MAX_MATCH - (int)(strend - scan);
+        scan = strend - MAX_MATCH;
+
+
+        if (len > best_len) {
+            state.ds.match_start = cur_match;
+            best_len = len;
+            if (len >= state.ds.nice_match) break;
+            scan_end1  = scan[best_len-1];
+            scan_end   = scan[best_len];
+        }
+    } while ((cur_match = state.ds.prev[cur_match & WMASK]) > limit
+             && --chain_length != 0);
+
+    return best_len;
+}
+
+
+
+#define check_match(state,start, match, length)
+// or alternatively...
+//void check_match(TState &state,IPos start, IPos match, int length)
+//{ // check that the match is indeed a match
+//    if (memcmp((char*)state.ds.window + match,
+//                (char*)state.ds.window + start, length) != EQUAL) {
+//        fprintf(stderr,
+//            " start %d, match %d, length %d\n",
+//            start, match, length);
+//        error("invalid match");
+//    }
+//    if (state.verbose > 1) {
+//        fprintf(stderr,"\\[%d,%d]", start-match, length);
+//        do { fprintf(stdout,"%c",state.ds.window[start++]); } while (--length != 0);
+//    }
+//}
+
+/* ===========================================================================
+ * Fill the window when the lookahead becomes insufficient.
+ * Updates strstart and lookahead, and sets eofile if end of input file.
+ *
+ * IN assertion: lookahead < MIN_LOOKAHEAD && strstart + lookahead > 0
+ * OUT assertions: strstart <= window_size-MIN_LOOKAHEAD
+ *    At least one byte has been read, or eofile is set; file reads are
+ *    performed for at least two bytes (required for the translate_eol option).
+ */
+void fill_window(TState &state)
+{
+    register unsigned n, m;
+    unsigned more;    /* Amount of free space at the end of the window. */
+
+    do {
+        more = (unsigned)(state.ds.window_size - (ulg)state.ds.lookahead - (ulg)state.ds.strstart);
+
+        /* If the window is almost full and there is insufficient lookahead,
+         * move the upper half to the lower one to make room in the upper half.
+         */
+        if (more == (unsigned)EOF) {
+            /* Very unlikely, but possible on 16 bit machine if strstart == 0
+             * and lookahead == 1 (input done one byte at time)
+             */
+            more--;
+
+        /* For MMAP or BIG_MEM, the whole input file is already in memory so
+         * we must not perform sliding. We must however call (*read_buf)() in
+         * order to compute the crc, update lookahead and possibly set eofile.
+         */
+        } else if (state.ds.strstart >= WSIZE+MAX_DIST && state.ds.sliding) {
+
+            /* By the IN assertion, the window is not empty so we can't confuse
+             * more == 0 with more == 64K on a 16 bit machine.
+             */
+            memcpy((char*)state.ds.window, (char*)state.ds.window+WSIZE, (unsigned)WSIZE);
+            state.ds.match_start -= WSIZE;
+            state.ds.strstart    -= WSIZE; /* we now have strstart >= MAX_DIST: */
+
+            state.ds.block_start -= (long) WSIZE;
+
+            for (n = 0; n < HASH_SIZE; n++) {
+                m = state.ds.head[n];
+                state.ds.head[n] = (Pos)(m >= WSIZE ? m-WSIZE : NIL);
+            }
+            for (n = 0; n < WSIZE; n++) {
+                m = state.ds.prev[n];
+                state.ds.prev[n] = (Pos)(m >= WSIZE ? m-WSIZE : NIL);
+                /* If n is not on any hash chain, prev[n] is garbage but
+                 * its value will never be used.
+                 */
+            }
+            more += WSIZE;
+        }
+        if (state.ds.eofile) return;
+
+        /* If there was no sliding:
+         *    strstart <= WSIZE+MAX_DIST-1 && lookahead <= MIN_LOOKAHEAD - 1 &&
+         *    more == window_size - lookahead - strstart
+         * => more >= window_size - (MIN_LOOKAHEAD-1 + WSIZE + MAX_DIST-1)
+         * => more >= window_size - 2*WSIZE + 2
+         * In the MMAP or BIG_MEM case (not yet supported in gzip),
+         *   window_size == input_size + MIN_LOOKAHEAD  &&
+         *   strstart + lookahead <= input_size => more >= MIN_LOOKAHEAD.
+         * Otherwise, window_size == 2*WSIZE so more >= 2.
+         * If there was sliding, more >= WSIZE. So in all cases, more >= 2.
+         */
+        Assert(state,more >= 2, "more < 2");
+
+        n = state.readfunc(state, (char*)state.ds.window+state.ds.strstart+state.ds.lookahead, more);
+
+        if (n == 0 || n == (unsigned)EOF) {
+            state.ds.eofile = 1;
+        } else {
+            state.ds.lookahead += n;
+        }
+    } while (state.ds.lookahead < MIN_LOOKAHEAD && !state.ds.eofile);
+}
+
+/* ===========================================================================
+ * Flush the current block, with given end-of-file flag.
+ * IN assertion: strstart is set to the end of the current match.
+ */
+#define FLUSH_BLOCK(state,eof) \
+   flush_block(state,state.ds.block_start >= 0L ? (char*)&state.ds.window[(unsigned)state.ds.block_start] : \
+                (char*)NULL, (long)state.ds.strstart - state.ds.block_start, (eof))
+
+/* ===========================================================================
+ * Processes a new input file and return its compressed length. This
+ * function does not perform lazy evaluation of matches and inserts
+ * new strings in the dictionary only for unmatched strings or for short
+ * matches. It is used only for the fast compression options.
+ */
+ulg deflate_fast(TState &state)
+{
+    IPos hash_head = NIL;       /* head of the hash chain */
+    int flush;                  /* set if current block must be flushed */
+    unsigned match_length = 0;  /* length of best match */
+
+    state.ds.prev_length = MIN_MATCH-1;
+    while (state.ds.lookahead != 0) {
+        /* Insert the string window[strstart .. strstart+2] in the
+         * dictionary, and set hash_head to the head of the hash chain:
+         */
+        if (state.ds.lookahead >= MIN_MATCH)
+        INSERT_STRING(state.ds.strstart, hash_head);
+
+        /* Find the longest match, discarding those <= prev_length.
+         * At this point we have always match_length < MIN_MATCH
+         */
+        if (hash_head != NIL && state.ds.strstart - hash_head <= MAX_DIST) {
+            /* To simplify the code, we prevent matches with the string
+             * of window index 0 (in particular we have to avoid a match
+             * of the string with itself at the start of the input file).
+             */
+            /* Do not look for matches beyond the end of the input.
+             * This is necessary to make deflate deterministic.
+             */
+            if ((unsigned)state.ds.nice_match > state.ds.lookahead) state.ds.nice_match = (int)state.ds.lookahead;
+            match_length = longest_match (state,hash_head);
+            /* longest_match() sets match_start */
+            if (match_length > state.ds.lookahead) match_length = state.ds.lookahead;
+        }
+        if (match_length >= MIN_MATCH) {
+            check_match(state,state.ds.strstart, state.ds.match_start, match_length);
+
+            flush = ct_tally(state,state.ds.strstart-state.ds.match_start, match_length - MIN_MATCH);
+
+            state.ds.lookahead -= match_length;
+
+            /* Insert new strings in the hash table only if the match length
+             * is not too large. This saves time but degrades compression.
+             */
+            if (match_length <= state.ds.max_insert_length
+                && state.ds.lookahead >= MIN_MATCH) {
+                match_length--; /* string at strstart already in hash table */
+                do {
+                    state.ds.strstart++;
+                    INSERT_STRING(state.ds.strstart, hash_head);
+                    /* strstart never exceeds WSIZE-MAX_MATCH, so there are
+                     * always MIN_MATCH bytes ahead.
+                     */
+                } while (--match_length != 0);
+                state.ds.strstart++;
+            } else {
+                state.ds.strstart += match_length;
+                match_length = 0;
+                state.ds.ins_h = state.ds.window[state.ds.strstart];
+                UPDATE_HASH(state.ds.ins_h, state.ds.window[state.ds.strstart+1]);
+                Assert(state,MIN_MATCH==3,"Call UPDATE_HASH() MIN_MATCH-3 more times");
+            }
+        } else {
+            /* No match, output a literal byte */
+            flush = ct_tally (state,0, state.ds.window[state.ds.strstart]);
+            state.ds.lookahead--;
+            state.ds.strstart++;
+        }
+        if (flush) FLUSH_BLOCK(state,0), state.ds.block_start = state.ds.strstart;
+
+        /* Make sure that we always have enough lookahead, except
+         * at the end of the input file. We need MAX_MATCH bytes
+         * for the next match, plus MIN_MATCH bytes to insert the
+         * string following the next match.
+         */
+        if (state.ds.lookahead < MIN_LOOKAHEAD) fill_window(state);
+    }
+    return FLUSH_BLOCK(state,1); /* eof */
+}
+
+/* ===========================================================================
+ * Same as above, but achieves better compression. We use a lazy
+ * evaluation for matches: a match is finally adopted only if there is
+ * no better match at the next window position.
+ */
+ulg deflate(TState &state)
+{
+    IPos hash_head = NIL;       /* head of hash chain */
+    IPos prev_match;            /* previous match */
+    int flush;                  /* set if current block must be flushed */
+    int match_available = 0;    /* set if previous match exists */
+    register unsigned match_length = MIN_MATCH-1; /* length of best match */
+
+    if (state.level <= 3) return deflate_fast(state); /* optimized for speed */
+
+    /* Process the input block. */
+    while (state.ds.lookahead != 0) {
+        /* Insert the string window[strstart .. strstart+2] in the
+         * dictionary, and set hash_head to the head of the hash chain:
+         */
+        if (state.ds.lookahead >= MIN_MATCH)
+        INSERT_STRING(state.ds.strstart, hash_head);
+
+        /* Find the longest match, discarding those <= prev_length.
+         */
+        state.ds.prev_length = match_length, prev_match = state.ds.match_start;
+        match_length = MIN_MATCH-1;
+
+        if (hash_head != NIL && state.ds.prev_length < state.ds.max_lazy_match &&
+            state.ds.strstart - hash_head <= MAX_DIST) {
+            /* To simplify the code, we prevent matches with the string
+             * of window index 0 (in particular we have to avoid a match
+             * of the string with itself at the start of the input file).
+             */
+            /* Do not look for matches beyond the end of the input.
+             * This is necessary to make deflate deterministic.
+             */
+            if ((unsigned)state.ds.nice_match > state.ds.lookahead) state.ds.nice_match = (int)state.ds.lookahead;
+            match_length = longest_match (state,hash_head);
+            /* longest_match() sets match_start */
+            if (match_length > state.ds.lookahead) match_length = state.ds.lookahead;
+
+            /* Ignore a length 3 match if it is too distant: */
+            if (match_length == MIN_MATCH && state.ds.strstart-state.ds.match_start > TOO_FAR){
+                /* If prev_match is also MIN_MATCH, match_start is garbage
+                 * but we will ignore the current match anyway.
+                 */
+                match_length = MIN_MATCH-1;
+            }
+        }
+        /* If there was a match at the previous step and the current
+         * match is not better, output the previous match:
+         */
+        if (state.ds.prev_length >= MIN_MATCH && match_length <= state.ds.prev_length) {
+            unsigned max_insert = state.ds.strstart + state.ds.lookahead - MIN_MATCH;
+            check_match(state,state.ds.strstart-1, prev_match, state.ds.prev_length);
+            flush = ct_tally(state,state.ds.strstart-1-prev_match, state.ds.prev_length - MIN_MATCH);
+
+            /* Insert in hash table all strings up to the end of the match.
+             * strstart-1 and strstart are already inserted.
+             */
+            state.ds.lookahead -= state.ds.prev_length-1;
+            state.ds.prev_length -= 2;
+            do {
+                if (++state.ds.strstart <= max_insert) {
+                    INSERT_STRING(state.ds.strstart, hash_head);
+                    /* strstart never exceeds WSIZE-MAX_MATCH, so there are
+                     * always MIN_MATCH bytes ahead.
+                     */
+                }
+            } while (--state.ds.prev_length != 0);
+            state.ds.strstart++;
+            match_available = 0;
+            match_length = MIN_MATCH-1;
+
+            if (flush) FLUSH_BLOCK(state,0), state.ds.block_start = state.ds.strstart;
+
+        } else if (match_available) {
+            /* If there was no match at the previous position, output a
+             * single literal. If there was a match but the current match
+             * is longer, truncate the previous match to a single literal.
+             */
+            if (ct_tally (state,0, state.ds.window[state.ds.strstart-1])) {
+                FLUSH_BLOCK(state,0), state.ds.block_start = state.ds.strstart;
+            }
+            state.ds.strstart++;
+            state.ds.lookahead--;
+        } else {
+            /* There is no previous match to compare with, wait for
+             * the next step to decide.
+             */
+            match_available = 1;
+            state.ds.strstart++;
+            state.ds.lookahead--;
+        }
+//        Assert(state,strstart <= isize && lookahead <= isize, "a bit too far");
+
+        /* Make sure that we always have enough lookahead, except
+         * at the end of the input file. We need MAX_MATCH bytes
+         * for the next match, plus MIN_MATCH bytes to insert the
+         * string following the next match.
+         */
+        if (state.ds.lookahead < MIN_LOOKAHEAD) fill_window(state);
+    }
+    if (match_available) ct_tally (state,0, state.ds.window[state.ds.strstart-1]);
+
+    return FLUSH_BLOCK(state,1); /* eof */
+}
+
+
+
+
+
+
+
+
+
+
+
+
+int putlocal(struct zlist far *z, WRITEFUNC wfunc,void *param)
+{ // Write a local header described by *z to file *f.  Return a ZE_ error code.
+  PUTLG(LOCSIG, f);
+  PUTSH(z->ver, f);
+  PUTSH(z->lflg, f);
+  PUTSH(z->how, f);
+  PUTLG(z->tim, f);
+  PUTLG(z->crc, f);
+  PUTLG(z->siz, f);
+  PUTLG(z->len, f);
+  PUTSH(z->nam, f);
+  PUTSH(z->ext, f);
+  size_t res = (size_t)wfunc(param, z->iname, (unsigned int)z->nam);
+  if (res!=z->nam) return ZE_TEMP;
+  if (z->ext)
+  { res = (size_t)wfunc(param, z->extra, (unsigned int)z->ext);
+    if (res!=z->ext) return ZE_TEMP;
+  }
+  return ZE_OK;
+}
+
+int putextended(struct zlist far *z, WRITEFUNC wfunc, void *param)
+{ // Write an extended local header described by *z to file *f. Returns a ZE_ code
+  PUTLG(EXTLOCSIG, f);
+  PUTLG(z->crc, f);
+  PUTLG(z->siz, f);
+  PUTLG(z->len, f);
+  return ZE_OK;
+}
+
+int putcentral(struct zlist far *z, WRITEFUNC wfunc, void *param)
+{ // Write a central header entry of *z to file *f. Returns a ZE_ code.
+  PUTLG(CENSIG, f);
+  PUTSH(z->vem, f);
+  PUTSH(z->ver, f);
+  PUTSH(z->flg, f);
+  PUTSH(z->how, f);
+  PUTLG(z->tim, f);
+  PUTLG(z->crc, f);
+  PUTLG(z->siz, f);
+  PUTLG(z->len, f);
+  PUTSH(z->nam, f);
+  PUTSH(z->cext, f);
+  PUTSH(z->com, f);
+  PUTSH(z->dsk, f);
+  PUTSH(z->att, f);
+  PUTLG(z->atx, f);
+  PUTLG(z->off, f);
+  if ((size_t)wfunc(param, z->iname, (unsigned int)z->nam) != z->nam ||
+      (z->cext && (size_t)wfunc(param, z->cextra, (unsigned int)z->cext) != z->cext) ||
+      (z->com && (size_t)wfunc(param, z->comment, (unsigned int)z->com) != z->com))
+    return ZE_TEMP;
+  return ZE_OK;
+}
+
+
+int putend(int n, ulg s, ulg c, extent m, char *z, WRITEFUNC wfunc, void *param)
+{ // write the end of the central-directory-data to file *f.
+  PUTLG(ENDSIG, f);
+  PUTSH(0, f);
+  PUTSH(0, f);
+  PUTSH(n, f);
+  PUTSH(n, f);
+  PUTLG(s, f);
+  PUTLG(c, f);
+  PUTSH(m, f);
+  // Write the comment, if any
+  if (m && wfunc(param, z, (unsigned int)m) != m) return ZE_TEMP;
+  return ZE_OK;
+}
+
+
+
+
+
+
+const ulg crc_table[256] = {
+  0x00000000L, 0x77073096L, 0xee0e612cL, 0x990951baL, 0x076dc419L,
+  0x706af48fL, 0xe963a535L, 0x9e6495a3L, 0x0edb8832L, 0x79dcb8a4L,
+  0xe0d5e91eL, 0x97d2d988L, 0x09b64c2bL, 0x7eb17cbdL, 0xe7b82d07L,
+  0x90bf1d91L, 0x1db71064L, 0x6ab020f2L, 0xf3b97148L, 0x84be41deL,
+  0x1adad47dL, 0x6ddde4ebL, 0xf4d4b551L, 0x83d385c7L, 0x136c9856L,
+  0x646ba8c0L, 0xfd62f97aL, 0x8a65c9ecL, 0x14015c4fL, 0x63066cd9L,
+  0xfa0f3d63L, 0x8d080df5L, 0x3b6e20c8L, 0x4c69105eL, 0xd56041e4L,
+  0xa2677172L, 0x3c03e4d1L, 0x4b04d447L, 0xd20d85fdL, 0xa50ab56bL,
+  0x35b5a8faL, 0x42b2986cL, 0xdbbbc9d6L, 0xacbcf940L, 0x32d86ce3L,
+  0x45df5c75L, 0xdcd60dcfL, 0xabd13d59L, 0x26d930acL, 0x51de003aL,
+  0xc8d75180L, 0xbfd06116L, 0x21b4f4b5L, 0x56b3c423L, 0xcfba9599L,
+  0xb8bda50fL, 0x2802b89eL, 0x5f058808L, 0xc60cd9b2L, 0xb10be924L,
+  0x2f6f7c87L, 0x58684c11L, 0xc1611dabL, 0xb6662d3dL, 0x76dc4190L,
+  0x01db7106L, 0x98d220bcL, 0xefd5102aL, 0x71b18589L, 0x06b6b51fL,
+  0x9fbfe4a5L, 0xe8b8d433L, 0x7807c9a2L, 0x0f00f934L, 0x9609a88eL,
+  0xe10e9818L, 0x7f6a0dbbL, 0x086d3d2dL, 0x91646c97L, 0xe6635c01L,
+  0x6b6b51f4L, 0x1c6c6162L, 0x856530d8L, 0xf262004eL, 0x6c0695edL,
+  0x1b01a57bL, 0x8208f4c1L, 0xf50fc457L, 0x65b0d9c6L, 0x12b7e950L,
+  0x8bbeb8eaL, 0xfcb9887cL, 0x62dd1ddfL, 0x15da2d49L, 0x8cd37cf3L,
+  0xfbd44c65L, 0x4db26158L, 0x3ab551ceL, 0xa3bc0074L, 0xd4bb30e2L,
+  0x4adfa541L, 0x3dd895d7L, 0xa4d1c46dL, 0xd3d6f4fbL, 0x4369e96aL,
+  0x346ed9fcL, 0xad678846L, 0xda60b8d0L, 0x44042d73L, 0x33031de5L,
+  0xaa0a4c5fL, 0xdd0d7cc9L, 0x5005713cL, 0x270241aaL, 0xbe0b1010L,
+  0xc90c2086L, 0x5768b525L, 0x206f85b3L, 0xb966d409L, 0xce61e49fL,
+  0x5edef90eL, 0x29d9c998L, 0xb0d09822L, 0xc7d7a8b4L, 0x59b33d17L,
+  0x2eb40d81L, 0xb7bd5c3bL, 0xc0ba6cadL, 0xedb88320L, 0x9abfb3b6L,
+  0x03b6e20cL, 0x74b1d29aL, 0xead54739L, 0x9dd277afL, 0x04db2615L,
+  0x73dc1683L, 0xe3630b12L, 0x94643b84L, 0x0d6d6a3eL, 0x7a6a5aa8L,
+  0xe40ecf0bL, 0x9309ff9dL, 0x0a00ae27L, 0x7d079eb1L, 0xf00f9344L,
+  0x8708a3d2L, 0x1e01f268L, 0x6906c2feL, 0xf762575dL, 0x806567cbL,
+  0x196c3671L, 0x6e6b06e7L, 0xfed41b76L, 0x89d32be0L, 0x10da7a5aL,
+  0x67dd4accL, 0xf9b9df6fL, 0x8ebeeff9L, 0x17b7be43L, 0x60b08ed5L,
+  0xd6d6a3e8L, 0xa1d1937eL, 0x38d8c2c4L, 0x4fdff252L, 0xd1bb67f1L,
+  0xa6bc5767L, 0x3fb506ddL, 0x48b2364bL, 0xd80d2bdaL, 0xaf0a1b4cL,
+  0x36034af6L, 0x41047a60L, 0xdf60efc3L, 0xa867df55L, 0x316e8eefL,
+  0x4669be79L, 0xcb61b38cL, 0xbc66831aL, 0x256fd2a0L, 0x5268e236L,
+  0xcc0c7795L, 0xbb0b4703L, 0x220216b9L, 0x5505262fL, 0xc5ba3bbeL,
+  0xb2bd0b28L, 0x2bb45a92L, 0x5cb36a04L, 0xc2d7ffa7L, 0xb5d0cf31L,
+  0x2cd99e8bL, 0x5bdeae1dL, 0x9b64c2b0L, 0xec63f226L, 0x756aa39cL,
+  0x026d930aL, 0x9c0906a9L, 0xeb0e363fL, 0x72076785L, 0x05005713L,
+  0x95bf4a82L, 0xe2b87a14L, 0x7bb12baeL, 0x0cb61b38L, 0x92d28e9bL,
+  0xe5d5be0dL, 0x7cdcefb7L, 0x0bdbdf21L, 0x86d3d2d4L, 0xf1d4e242L,
+  0x68ddb3f8L, 0x1fda836eL, 0x81be16cdL, 0xf6b9265bL, 0x6fb077e1L,
+  0x18b74777L, 0x88085ae6L, 0xff0f6a70L, 0x66063bcaL, 0x11010b5cL,
+  0x8f659effL, 0xf862ae69L, 0x616bffd3L, 0x166ccf45L, 0xa00ae278L,
+  0xd70dd2eeL, 0x4e048354L, 0x3903b3c2L, 0xa7672661L, 0xd06016f7L,
+  0x4969474dL, 0x3e6e77dbL, 0xaed16a4aL, 0xd9d65adcL, 0x40df0b66L,
+  0x37d83bf0L, 0xa9bcae53L, 0xdebb9ec5L, 0x47b2cf7fL, 0x30b5ffe9L,
+  0xbdbdf21cL, 0xcabac28aL, 0x53b39330L, 0x24b4a3a6L, 0xbad03605L,
+  0xcdd70693L, 0x54de5729L, 0x23d967bfL, 0xb3667a2eL, 0xc4614ab8L,
+  0x5d681b02L, 0x2a6f2b94L, 0xb40bbe37L, 0xc30c8ea1L, 0x5a05df1bL,
+  0x2d02ef8dL
+};
+
+#define CRC32(c, b) (crc_table[((int)(c) ^ (b)) & 0xff] ^ ((c) >> 8))
+#define DO1(buf)  crc = CRC32(crc, *buf++)
+#define DO2(buf)  DO1(buf); DO1(buf)
+#define DO4(buf)  DO2(buf); DO2(buf)
+#define DO8(buf)  DO4(buf); DO4(buf)
+
+ulg crc32(ulg crc, const uch *buf, extent len)
+{ if (buf==NULL) return 0L;
+  crc = crc ^ 0xffffffffL;
+  while (len >= 8) {DO8(buf); len -= 8;}
+  if (len) do {DO1(buf);} while (--len);
+  return crc ^ 0xffffffffL;  // (instead of ~c for 64-bit machines)
+}
+
+
+
+
+
+
+
+
+bool HasZipSuffix(const char *fn)
+{ const char *ext = fn+strlen(fn);
+  while (ext>fn && *ext!='.') ext--;
+  if (ext==fn && *ext!='.') return false;
+  if (stricmp(ext,".Z")==0) return true;
+  if (stricmp(ext,".zip")==0) return true;
+  if (stricmp(ext,".zoo")==0) return true;
+  if (stricmp(ext,".arc")==0) return true;
+  if (stricmp(ext,".lzh")==0) return true;
+  if (stricmp(ext,".arj")==0) return true;
+  if (stricmp(ext,".gz")==0) return true;
+  if (stricmp(ext,".tgz")==0) return true;
+  return false;
+}
+
+
+time_t filetime2timet(const FILETIME ft)
+{ SYSTEMTIME st; FileTimeToSystemTime(&ft,&st);
+  if (st.wYear<1970) {st.wYear=1970; st.wMonth=1; st.wDay=1;}
+  if (st.wYear>=2038) {st.wYear=2037; st.wMonth=12; st.wDay=31;}
+  struct tm tm;
+  tm.tm_sec = st.wSecond;
+  tm.tm_min = st.wMinute;
+  tm.tm_hour = st.wHour;
+  tm.tm_mday = st.wDay;
+  tm.tm_mon = st.wMonth-1;
+  tm.tm_year = st.wYear-1900;
+  tm.tm_isdst = 0;
+  time_t t = mktime(&tm);
+  return t;
+}
+
+
+ZRESULT GetFileInfo(HANDLE hf, ulg *attr, long *size, iztimes *times, ulg *timestamp)
+{ 
+	DWORD type=GetFileType(hf);
+  if (type!=FILE_TYPE_DISK) 
+	  return ZR_NOTINITED;
+  // The handle must be a handle to a file
+  // The date and time is returned in a long with the date most significant to allow
+  // unsigned integer comparison of absolute times. The attributes have two
+  // high bytes unix attr, and two low bytes a mapping of that to DOS attr.
+  //struct stat s; int res=stat(fn,&s); if (res!=0) return false;
+  // translate windows file attributes into zip ones.
+  BY_HANDLE_FILE_INFORMATION bhi; 
+  BOOL res=GetFileInformationByHandle(hf,&bhi);
+  if (!res) 
+	  return ZR_NOFILE;
+
+  // +++1.3
+  /// Convert times from UTC to local time. MSDN says that FILETIME is local
+  /// for FAT file system and UTC for NTFS system, but tests show that both FAT and NTFS
+  /// return UTC time.
+  {
+	  // Get time zone difference
+	  SYSTEMTIME stUTC, stLocal;
+	  GetSystemTime(&stUTC);
+	  GetLocalTime(&stLocal); // could be a few milliseconds difference, but should we care?
+	  FILETIME ftUTC, ftLocal;
+	  SystemTimeToFileTime(&stUTC, &ftUTC);
+	  SystemTimeToFileTime(&stLocal, &ftLocal);
+	  LONG64 uiUTC, uiLocal;
+	  memcpy (&uiUTC, &ftUTC, min(sizeof(LONG64), sizeof(FILETIME))); // use 'min' as safeguard, however both sizes should be the same: 64-bit
+	  memcpy (&uiLocal, &ftLocal, min(sizeof(LONG64), sizeof(FILETIME)));
+	  LONG64 uiTimeDiff = uiUTC - uiLocal;
+
+	  // apply difference
+	  FILETIME* pFileTimes[3] = { &bhi.ftLastWriteTime, &bhi.ftLastAccessTime, &bhi.ftCreationTime };
+	  for (int i=0; i<3; i++){
+		  LONG64 uiUTC_file;
+		  memcpy (&uiUTC_file, pFileTimes[i], min(sizeof(LONG64), sizeof(FILETIME)));
+		  LONG64 uiLocal_file = uiUTC_file - uiTimeDiff;
+		  memcpy (pFileTimes[i], &uiLocal_file, min(sizeof(LONG64), sizeof(FILETIME)));
+	  }
+  }
+
+  DWORD fa=bhi.dwFileAttributes; 
+  ulg a=0;
+  // Zip uses the lower word for its interpretation of windows stuff
+  if (fa&FILE_ATTRIBUTE_READONLY) a|=0x01;
+  if (fa&FILE_ATTRIBUTE_HIDDEN)   a|=0x02;
+  if (fa&FILE_ATTRIBUTE_SYSTEM)   a|=0x04;
+  if (fa&FILE_ATTRIBUTE_DIRECTORY)a|=0x10;
+  if (fa&FILE_ATTRIBUTE_ARCHIVE)  a|=0x20;
+  // It uses the upper word for standard unix attr, which we must manually construct
+  if (fa&FILE_ATTRIBUTE_DIRECTORY)a|=0x40000000;  // directory
+  else a|=0x80000000;  // normal file
+  a|=0x01000000;      // readable
+  if (fa&FILE_ATTRIBUTE_READONLY) {}
+  else a|=0x00800000; // writeable
+  // now just a small heuristic to check if it's an executable:
+  DWORD red, hsize=GetFileSize(hf,NULL); if (hsize>40)
+  { SetFilePointer(hf,0,NULL,FILE_BEGIN); unsigned short magic; ReadFile(hf,&magic,sizeof(magic),&red,NULL);
+    SetFilePointer(hf,36,NULL,FILE_BEGIN); unsigned long hpos;  ReadFile(hf,&hpos,sizeof(hpos),&red,NULL);
+    if (magic==0x54AD && hsize>hpos+4+20+28)
+    { SetFilePointer(hf,hpos,NULL,FILE_BEGIN); unsigned long signature; ReadFile(hf,&signature,sizeof(signature),&red,NULL);
+      if (signature==IMAGE_DOS_SIGNATURE || signature==IMAGE_OS2_SIGNATURE
+         || signature==IMAGE_OS2_SIGNATURE_LE || signature==IMAGE_NT_SIGNATURE)
+      { a |= 0x00400000; // executable
+      }
+    }
+  }
+  //
+  if (attr!=NULL) *attr = a;
+  if (size!=NULL) *size = hsize;
+  if (times!=NULL)
+  { // time_t is 32bit number of seconds elapsed since 0:0:0GMT, Jan1, 1970.
+    // but FILETIME is 64bit number of 100-nanosecs since Jan1, 1601
+    times->atime = filetime2timet(bhi.ftLastAccessTime);
+    times->mtime = filetime2timet(bhi.ftLastWriteTime);
+    times->ctime = filetime2timet(bhi.ftCreationTime);
+  }
+  if (timestamp!=NULL)
+  { WORD dosdate,dostime;
+    FileTimeToDosDateTime(&bhi.ftLastWriteTime,&dosdate,&dostime);
+    *timestamp = (WORD)dostime | (((DWORD)dosdate)<<16);
+  }
+  return ZR_OK;
+}
+
+
+
+
+
+///////////////////////////////////////////////////////////////////////////////
+///////////////////////////////////////////////////////////////////////////////
+///////////////////////////////////////////////////////////////////////////////
+
+class TZip
+{ public:
+  TZip() : hfout(0),hmapout(0),zfis(0),obuf(0),hfin(0),writ(0),oerr(false),hasputcen(false),ooffset(0) {}
+  ~TZip() {}
+
+  // These variables say about the file we're writing into
+  // We can write to pipe, file-by-handle, file-by-name, memory-to-memmapfile
+  HANDLE hfout;             // if valid, we'll write here (for files or pipes)
+  HANDLE hmapout;           // otherwise, we'll write here (for memmap)
+  unsigned ooffset;         // for hfout, this is where the pointer was initially
+  ZRESULT oerr;             // did a write operation give rise to an error?
+  unsigned writ;            // how far have we written. This is maintained by Add, not write(), to avoid confusion over seeks
+  bool ocanseek;            // can we seek?
+  char *obuf;               // this is where we've locked mmap to view.
+  unsigned int opos;        // current pos in the mmap
+  unsigned int mapsize;     // the size of the map we created
+  bool hasputcen;           // have we yet placed the central directory?
+  //
+  TZipFileInfo *zfis;       // each file gets added onto this list, for writing the table at the end
+
+  ZRESULT Create(void *z,unsigned int len,DWORD flags);
+  static unsigned sflush(void *param,const char *buf, unsigned *size);
+  static unsigned swrite(void *param,const char *buf, unsigned size);
+  unsigned int write(const char *buf,unsigned int size);
+  bool oseek(unsigned int pos);
+  ZRESULT GetMemory(void **pbuf, unsigned long *plen);
+  ZRESULT Close();
+
+  // some variables to do with the file currently being read:
+  // I haven't done it object-orientedly here, just put them all
+  // together, since OO didn't seem to make the design any clearer.
+  ulg attr; iztimes times; ulg timestamp;  // all open_* methods set these
+  bool iseekable; long isize,ired;         // size is not set until close() on pips
+  ulg crc;                                 // crc is not set until close(). iwrit is cumulative
+  HANDLE hfin; bool selfclosehf;           // for input files and pipes
+  const char *bufin; unsigned int lenin,posin; // for memory
+  // and a variable for what we've done with the input: (i.e. compressed it!)
+  ulg csize;                               // compressed size, set by the compression routines
+  // and this is used by some of the compression routines
+  char buf[16384];
+
+
+  ZRESULT open_file(const TCHAR *fn);
+  ZRESULT open_handle(HANDLE hf,unsigned int len);
+  ZRESULT open_mem(void *src,unsigned int len);
+  ZRESULT open_dir();
+  static unsigned sread(TState &s,char *buf,unsigned size);
+  unsigned read(char *buf, unsigned size);
+  ZRESULT iclose();
+
+  ZRESULT ideflate(TZipFileInfo *zfi);
+  ZRESULT istore();
+
+  ZRESULT Add(const char *odstzn, void *src,unsigned int len, DWORD flags);
+  ZRESULT AddCentral();
+
+};
+
+ZRESULT TZip::Create(void *z,unsigned int len,DWORD flags)
+{ 
+	if (hfout!=0 || hmapout!=0 || obuf!=0 || writ!=0 || oerr!=ZR_OK || hasputcen) 
+		return ZR_NOTINITED;
+	//
+	if (flags==ZIP_HANDLE)
+	{ 
+		HANDLE hf = (HANDLE)z;
+		BOOL res = DuplicateHandle(GetCurrentProcess(),hf,GetCurrentProcess(),&hfout,0,FALSE,DUPLICATE_SAME_ACCESS);
+		if (!res) 
+			return ZR_NODUPH;
+		// now we have our own hfout, which we must close. And the caller will close hf
+		DWORD type = GetFileType(hfout);
+		ocanseek = (type==FILE_TYPE_DISK);
+		if (type==FILE_TYPE_DISK) 
+			ooffset=SetFilePointer(hfout,0,NULL,FILE_CURRENT);
+		else 
+			ooffset=0;
+		return ZR_OK;
+	}
+	else if (flags==ZIP_FILENAME)
+	{ 
+#ifdef _UNICODE
+		const TCHAR *fn = (const TCHAR*)z;
+		hfout = CreateFileW(fn,GENERIC_WRITE,0,NULL,CREATE_ALWAYS,FILE_ATTRIBUTE_NORMAL,NULL);
+#else
+		const char *fn = (const char*)z;
+		hfout = CreateFileA(fn,GENERIC_WRITE,0,NULL,CREATE_ALWAYS,FILE_ATTRIBUTE_NORMAL,NULL);
+#endif
+
+		if (hfout==INVALID_HANDLE_VALUE) 
+		{
+			hfout=0;
+			return ZR_NOFILE;
+		}
+		ocanseek=true;
+		ooffset=0;
+		return ZR_OK;
+	}
+	else if (flags==ZIP_MEMORY)
+	{ 
+		unsigned int size = len;
+		if (size==0) 
+			return ZR_MEMSIZE;
+		if (z!=0) 
+			obuf=(char*)z;
+		else
+		{ 
+			hmapout = CreateFileMapping(INVALID_HANDLE_VALUE,NULL,PAGE_READWRITE,0,size,NULL);
+			if (hmapout==NULL) 
+				return ZR_NOALLOC;
+			obuf = (char*)MapViewOfFile(hmapout,FILE_MAP_ALL_ACCESS,0,0,size);
+			if (obuf==0) 
+			{
+				CloseHandle(hmapout); 
+				hmapout=0; 
+				return ZR_NOALLOC;
+			}
+		}
+		ocanseek=true;
+		opos=0; 
+		mapsize=size;
+		return ZR_OK;
+	}
+	else 
+		return ZR_ARGS;
+}
+
+
+unsigned TZip::sflush(void *param,const char *buf, unsigned *size)
+{ // static
+  if (*size==0) return 0;
+  TZip *zip = (TZip*)param;
+  unsigned int writ = zip->write(buf,*size);
+  if (writ!=0) *size=0;
+  return writ;
+}
+unsigned TZip::swrite(void *param,const char *buf, unsigned size)
+{ // static
+  if (size==0) return 0;
+  TZip *zip=(TZip*)param; return zip->write(buf,size);
+}
+
+#if 0  // -----------------------------------------------------------
+unsigned int TZip::write(const char *buf,unsigned int size)
+{ if (obuf!=0)
+  { if (opos+size>=mapsize) {oerr=ZR_MEMSIZE; return 0;}
+    memcpy(obuf+opos, buf, size);
+    opos+=size;
+    return size;
+  }
+  else if (hfout!=0)
+  { DWORD writ; WriteFile(hfout,buf,size,&writ,NULL);
+    return writ;
+  }
+  oerr=ZR_NOTINITED; return 0;
+}
+#endif // -----------------------------------------------------------
+
+//+++1.2
+unsigned int TZip::write(const char *buf, unsigned int size)
+{ 
+	if (obuf != 0)
+	{ 
+		if (opos+size >= mapsize)
+		{
+			int newmapsize = 2*mapsize>opos+size?2*mapsize:opos+size;
+			HANDLE hmapout2 = CreateFileMapping(INVALID_HANDLE_VALUE,NULL,PAGE_READWRITE,0,newmapsize,NULL);
+			if (hmapout2 == NULL)
+				return ZR_NOALLOC;
+			char *obuf2 = NULL; // this is where we've locked mmap to view.
+			
+			obuf2 = (char*)MapViewOfFile(hmapout2,FILE_MAP_ALL_ACCESS,0,0,newmapsize);
+			if (obuf2 == 0)
+			{
+				CloseHandle(hmapout2);
+				hmapout2 = 0;
+				return ZR_NOALLOC;
+			}
+			
+			memcpy(obuf2, obuf, mapsize);
+			
+			UnmapViewOfFile(obuf);
+			CloseHandle(hmapout);
+			
+			mapsize = newmapsize;
+			obuf = obuf2;
+			hmapout = hmapout2;
+		}
+		memcpy(obuf+opos, buf, size);
+		opos += size;
+		return size;
+	}
+	else if (hfout!=0)
+	{ 
+		DWORD writ = 0; 
+		WriteFile(hfout,buf,size,&writ,NULL);
+		return writ;
+	}
+	oerr = ZR_NOTINITED; 
+	return 0;
+}
+
+
+bool TZip::oseek(unsigned int pos)
+{ if (!ocanseek) {oerr=ZR_SEEK; return false;}
+  if (obuf!=0)
+  { if (pos>=mapsize) {oerr=ZR_MEMSIZE; return false;}
+    opos=pos;
+    return true;
+  }
+  else if (hfout!=0)
+  { SetFilePointer(hfout,pos+ooffset,NULL,FILE_BEGIN);
+    return true;
+  }
+  oerr=ZR_NOTINITED; return 0;
+}
+
+ZRESULT TZip::GetMemory(void **pbuf, unsigned long *plen)
+{ // When the user calls GetMemory, they're presumably at the end
+  // of all their adding. In any case, we have to add the central
+  // directory now, otherwise the memory we tell them won't be complete.
+  if (!hasputcen) AddCentral(); hasputcen=true;
+  if (pbuf!=NULL) *pbuf=(void*)obuf;
+  if (plen!=NULL) *plen=writ;
+  if (obuf==NULL) return ZR_NOTMMAP;
+  return ZR_OK;
+}
+
+ZRESULT TZip::Close()
+{ // if the directory hadn't already been added through a call to GetMemory,
+  // then we do it now
+  ZRESULT res=ZR_OK; if (!hasputcen) res=AddCentral(); hasputcen=true;
+  if (obuf!=0 && hmapout!=0) UnmapViewOfFile(obuf); obuf=0;
+  if (hmapout!=0) CloseHandle(hmapout); hmapout=0;
+  if (hfout!=0) CloseHandle(hfout); hfout=0;
+  return res;
+}
+
+
+
+
+ZRESULT TZip::open_file(const TCHAR *fn)
+{ hfin=0; bufin=0; selfclosehf=false; crc=CRCVAL_INITIAL; isize=0; csize=0; ired=0;
+  if (fn==0) return ZR_ARGS;
+  HANDLE hf = CreateFile(fn,GENERIC_READ,FILE_SHARE_READ,NULL,OPEN_EXISTING,0,NULL);
+  if (hf==INVALID_HANDLE_VALUE) return ZR_NOFILE;
+  ZRESULT res = open_handle(hf,0);
+  if (res!=ZR_OK) {CloseHandle(hf); return res;}
+  selfclosehf=true;
+  return ZR_OK;
+}
+ZRESULT TZip::open_handle(HANDLE hf,unsigned int len)
+{ hfin=0; bufin=0; selfclosehf=false; crc=CRCVAL_INITIAL; isize=0; csize=0; ired=0;
+  if (hf==0 || hf==INVALID_HANDLE_VALUE) return ZR_ARGS;
+  DWORD type = GetFileType(hf);
+  if (type==FILE_TYPE_DISK)
+  { ZRESULT res = GetFileInfo(hf,&attr,&isize,&times,&timestamp);
+    if (res!=ZR_OK) return res;
+    SetFilePointer(hf,0,NULL,FILE_BEGIN); // because GetFileInfo will have screwed it up
+    iseekable=true; hfin=hf;
+    return ZR_OK;
+  }
+  else
+  { attr= 0x80000000;      // just a normal file
+    isize = -1;            // can't know size until at the end
+    if (len!=0) isize=len; // unless we were told explicitly!
+    iseekable=false;
+    SYSTEMTIME st; GetLocalTime(&st);
+    FILETIME ft;   SystemTimeToFileTime(&st,&ft);
+    WORD dosdate,dostime; FileTimeToDosDateTime(&ft,&dosdate,&dostime);
+    times.atime = filetime2timet(ft);
+    times.mtime = times.atime;
+    times.ctime = times.atime;
+    timestamp = (WORD)dostime | (((DWORD)dosdate)<<16);
+    hfin=hf;
+    return ZR_OK;
+  }
+}
+ZRESULT TZip::open_mem(void *src,unsigned int len)
+{ hfin=0; bufin=(const char*)src; selfclosehf=false; crc=CRCVAL_INITIAL; ired=0; csize=0; ired=0;
+  lenin=len; posin=0;
+  if (src==0 || len==0) return ZR_ARGS;
+  attr= 0x80000000; // just a normal file
+  isize = len;
+  iseekable=true;
+  SYSTEMTIME st; GetLocalTime(&st);
+  FILETIME ft;   SystemTimeToFileTime(&st,&ft);
+  WORD dosdate,dostime; FileTimeToDosDateTime(&ft,&dosdate,&dostime);
+  times.atime = filetime2timet(ft);
+  times.mtime = times.atime;
+  times.ctime = times.atime;
+  timestamp = (WORD)dostime | (((DWORD)dosdate)<<16);
+  return ZR_OK;
+}
+ZRESULT TZip::open_dir()
+{ hfin=0; bufin=0; selfclosehf=false; crc=CRCVAL_INITIAL; isize=0; csize=0; ired=0;
+  attr= 0x41C00010; // a readable writable directory, and again directory
+  isize = 0;
+  iseekable=false;
+  SYSTEMTIME st; GetLocalTime(&st);
+  FILETIME ft;   SystemTimeToFileTime(&st,&ft);
+  WORD dosdate,dostime; FileTimeToDosDateTime(&ft,&dosdate,&dostime);
+  times.atime = filetime2timet(ft);
+  times.mtime = times.atime;
+  times.ctime = times.atime;
+  timestamp = (WORD)dostime | (((DWORD)dosdate)<<16);
+  return ZR_OK;
+}
+
+unsigned TZip::sread(TState &s,char *buf,unsigned size)
+{ // static
+  TZip *zip = (TZip*)s.param;
+  return zip->read(buf,size);
+}
+
+unsigned TZip::read(char *buf, unsigned size)
+{ if (bufin!=0)
+  { if (posin>=lenin) return 0; // end of input
+    ulg red = lenin-posin;
+    if (red>size) red=size;
+    memcpy(buf, bufin+posin, red);
+    posin += red;
+    ired += red;
+    crc = crc32(crc, (uch*)buf, red);
+    return red;
+  }
+  else if (hfin!=0)
+  { DWORD red;
+    BOOL ok = ReadFile(hfin,buf,size,&red,NULL);
+    if (!ok) return 0;
+    ired += red;
+    crc = crc32(crc, (uch*)buf, red);
+    return red;
+  }
+  else {oerr=ZR_NOTINITED; return 0;}
+}
+
+ZRESULT TZip::iclose()
+{ if (selfclosehf && hfin!=0) CloseHandle(hfin); hfin=0;
+  bool mismatch = (isize!=-1 && isize!=ired);
+  isize=ired; // and crc has been being updated anyway
+  if (mismatch) return ZR_MISSIZE;
+  else return ZR_OK;
+}
+
+
+
+#if 0  // -----------------------------------------------------------
+ZRESULT TZip::ideflate(TZipFileInfo *zfi)
+{ TState state;
+  state.readfunc=sread; state.flush_outbuf=sflush;
+  state.param=this; state.level=8; state.seekable=iseekable; state.err=NULL;
+  // the following line will make ct_init realise it has to perform the init
+  state.ts.static_dtree[0].dl.len = 0;
+  // It would be nicer if I could figure out precisely which data had to
+  // be initted each time, and which didn't, but that's kind of difficult.
+  // Maybe for the next version...
+  //
+  bi_init(state,buf, sizeof(buf), TRUE); // it used to be just 1024-size, not 16384 as here
+  ct_init(state,&zfi->att);
+  lm_init(state,state.level, &zfi->flg);
+  ulg sz = deflate(state);
+  csize=sz;
+  if (state.err!=NULL) return ZR_FLATE;
+  else return ZR_OK;
+}
+#endif // -----------------------------------------------------------
+
+//+++1.2
+// create state object on heap
+ZRESULT TZip::ideflate(TZipFileInfo *zfi)
+{
+	ZRESULT zr = ZR_OK;
+	TState* state=new TState();
+	(*state).readfunc=sread; (*state).flush_outbuf=sflush;
+	(*state).param=this; (*state).level=8; (*state).seekable=iseekable; (*state).err=NULL;
+	// the following line will make ct_init realise it has to perform the init
+	(*state).ts.static_dtree[0].dl.len = 0;
+	// It would be nicer if I could figure out precisely which data had to
+	// be initted each time, and which didn't, but that's kind of difficult.
+	// Maybe for the next version...
+	//
+	bi_init(*state,buf, sizeof(buf), TRUE); // it used to be just 1024-size, not 16384 as here
+	ct_init(*state,&zfi->att);
+	lm_init(*state,(*state).level, &zfi->flg);
+	ulg sz = deflate(*state);
+	csize=sz;
+	if ((*state).err!=NULL)
+	{
+		zr = ZR_FLATE;
+	}
+	delete state;
+	return zr;
+}
+
+ZRESULT TZip::istore()
+{ ulg size=0;
+  for (;;)
+  { unsigned int cin=read(buf,16384); if (cin<=0 || cin==(unsigned int)EOF) break;
+    unsigned int cout = write(buf,cin); if (cout!=cin) return ZR_MISSIZE;
+    size += cin;
+  }
+  csize=size;
+  return ZR_OK;
+}
+
+
+
+
+ZRESULT TZip::Add(const char *odstzn, void *src,unsigned int len, DWORD flags)
+{ 
+	if (oerr) 
+		return ZR_FAILED;
+	if (hasputcen) 
+		return ZR_ENDED;
+
+	// zip has its own notion of what its names should look like: i.e. dir/file.stuff
+	char dstzn[MAX_PATH]; 
+	strcpy(dstzn, odstzn);
+	if (*dstzn == 0) 
+		return ZR_ARGS;
+	char *d=dstzn; 
+	while (*d != 0) 
+	{
+		if (*d == '\\') 
+			*d = '/'; d++;
+	}
+	bool isdir = (flags==ZIP_FOLDER);
+	bool needs_trailing_slash = (isdir && dstzn[strlen(dstzn)-1]!='/');
+	int method=DEFLATE; 
+	if (isdir || HasZipSuffix(dstzn)) 
+		method=STORE;
+
+	// now open whatever was our input source:
+	ZRESULT openres;
+	if (flags==ZIP_FILENAME) 
+		openres=open_file((const TCHAR*)src);
+	else if (flags==ZIP_HANDLE) 
+		openres=open_handle((HANDLE)src,len);
+	else if (flags==ZIP_MEMORY) 
+		openres=open_mem(src,len);
+	else if (flags==ZIP_FOLDER) 
+		openres=open_dir();
+	else return ZR_ARGS;
+	if (openres!=ZR_OK) 
+		return openres;
+
+	// A zip "entry" consists of a local header (which includes the file name),
+	// then the compressed data, and possibly an extended local header.
+
+	// Initialize the local header
+	TZipFileInfo zfi; zfi.nxt=NULL;
+	strcpy(zfi.name,"");
+	strcpy(zfi.iname,dstzn); 
+	zfi.nam=strlen(zfi.iname);
+	if (needs_trailing_slash) 
+	{
+		strcat(zfi.iname,"/"); 
+		zfi.nam++;
+	}
+	strcpy(zfi.zname,"");
+	zfi.extra=NULL; zfi.ext=0;   // extra header to go after this compressed data, and its length
+	zfi.cextra=NULL; zfi.cext=0; // extra header to go in the central end-of-zip directory, and its length
+	zfi.comment=NULL; zfi.com=0; // comment, and its length
+	zfi.mark = 1;
+	zfi.dosflag = 0;
+	zfi.att = (ush)BINARY;
+	zfi.vem = (ush)0xB17; // 0xB00 is win32 os-code. 0x17 is 23 in decimal: zip 2.3
+	zfi.ver = (ush)20;    // Needs PKUNZIP 2.0 to unzip it
+	zfi.tim = timestamp;
+	// Even though we write the header now, it will have to be rewritten, since we don't know compressed size or crc.
+	zfi.crc = 0;            // to be updated later
+	zfi.flg = 8;            // 8 means 'there is an extra header'. Assume for the moment that we need it.
+	zfi.lflg = zfi.flg;     // to be updated later
+	zfi.how = (ush)method;  // to be updated later
+	zfi.siz = (ulg)(method==STORE && isize>=0 ? isize : 0); // to be updated later
+	zfi.len = (ulg)(isize);  // to be updated later
+	zfi.dsk = 0;
+	zfi.atx = attr;
+	zfi.off = writ+ooffset;         // offset within file of the start of this local record
+	// stuff the 'times' structure into zfi.extra
+	char xloc[EB_L_UT_SIZE]; 
+	zfi.extra=xloc;  
+	zfi.ext=EB_L_UT_SIZE;
+	char xcen[EB_C_UT_SIZE]; 
+	zfi.cextra=xcen; 
+	zfi.cext=EB_C_UT_SIZE;
+	xloc[0]  = 'U';
+	xloc[1]  = 'T';
+	xloc[2]  = EB_UT_LEN(3);       // length of data part of e.f.
+	xloc[3]  = 0;
+	xloc[4]  = EB_UT_FL_MTIME | EB_UT_FL_ATIME | EB_UT_FL_CTIME;
+	xloc[5]  = (char)(times.mtime);
+	xloc[6]  = (char)(times.mtime >> 8);
+	xloc[7]  = (char)(times.mtime >> 16);
+	xloc[8]  = (char)(times.mtime >> 24);
+	xloc[9]  = (char)(times.atime);
+	xloc[10] = (char)(times.atime >> 8);
+	xloc[11] = (char)(times.atime >> 16);
+	xloc[12] = (char)(times.atime >> 24);
+	xloc[13] = (char)(times.ctime);
+	xloc[14] = (char)(times.ctime >> 8);
+	xloc[15] = (char)(times.ctime >> 16);
+	xloc[16] = (char)(times.ctime >> 24);
+	memcpy(zfi.cextra,zfi.extra,EB_C_UT_SIZE);
+	zfi.cextra[EB_LEN] = EB_UT_LEN(1);
+
+
+	// (1) Start by writing the local header:
+	int r = putlocal(&zfi,swrite,this);
+	if (r!=ZE_OK) 
+	{
+		iclose(); 
+		return ZR_WRITE;
+	}
+	writ += 4 + LOCHEAD + (unsigned int)zfi.nam + (unsigned int)zfi.ext;
+	if (oerr!=ZR_OK) 
+	{
+		iclose(); 
+		return oerr;
+	}
+
+	//(2) Write deflated/stored file to zip file
+	ZRESULT writeres=ZR_OK;
+	if (!isdir && method==DEFLATE) 
+		writeres=ideflate(&zfi);
+	else if (!isdir && method==STORE) 
+		writeres=istore();
+	else if (isdir) 
+		csize=0;
+	iclose();
+	writ += csize;
+	if (oerr!=ZR_OK) 
+		return oerr;
+	if (writeres!=ZR_OK) 
+		return ZR_WRITE;
+
+	// (3) Either rewrite the local header with correct information...
+	bool first_header_has_size_right = (zfi.siz==csize);
+	zfi.crc = crc;
+	zfi.siz = csize;
+	zfi.len = isize;
+	if (ocanseek)
+	{ 
+		zfi.how = (ush)method;
+		if ((zfi.flg & 1) == 0) 
+			zfi.flg &= ~8; // clear the extended local header flag
+		zfi.lflg = zfi.flg;
+		// rewrite the local header:
+		if (!oseek(zfi.off-ooffset)) 
+			return ZR_SEEK;
+		if ((r = putlocal(&zfi, swrite,this)) != ZE_OK) 
+			return ZR_WRITE;
+		if (!oseek(writ)) 
+			return ZR_SEEK;
+	}
+	else
+	{ 
+		// (4) ... or put an updated header at the end
+		if (zfi.how != (ush) method) 
+			return ZR_NOCHANGE;
+		if (method==STORE && !first_header_has_size_right) 
+			return ZR_NOCHANGE;
+		if ((r = putextended(&zfi, swrite,this)) != ZE_OK) 
+			return ZR_WRITE;
+		writ += 16L;
+		zfi.flg = zfi.lflg; // if flg modified by inflate, for the central index
+	}
+	if (oerr!=ZR_OK) 
+		return oerr;
+
+	// Keep a copy of the zipfileinfo, for our end-of-zip directory
+	char *cextra = new char[zfi.cext]; 
+	memcpy(cextra,zfi.cextra,zfi.cext); zfi.cextra=cextra;
+	TZipFileInfo *pzfi = new TZipFileInfo; 
+	memcpy(pzfi,&zfi,sizeof(zfi));
+	if (zfis==NULL) 
+		zfis=pzfi;
+	else 
+	{
+		TZipFileInfo *z=zfis; 
+		while (z->nxt!=NULL) 
+			z=z->nxt; 
+		z->nxt=pzfi;
+	}
+	return ZR_OK;
+}
+
+ZRESULT TZip::AddCentral()
+{ // write central directory
+  int numentries = 0;
+  ulg pos_at_start_of_central = writ;
+  //ulg tot_unc_size=0, tot_compressed_size=0;
+  bool okay=true;
+  for (TZipFileInfo *zfi=zfis; zfi!=NULL; )
+  { if (okay)
+    { int res = putcentral(zfi, swrite,this);
+      if (res!=ZE_OK) okay=false;
+    }
+    writ += 4 + CENHEAD + (unsigned int)zfi->nam + (unsigned int)zfi->cext + (unsigned int)zfi->com;
+    //tot_unc_size += zfi->len;
+    //tot_compressed_size += zfi->siz;
+    numentries++;
+    //
+    TZipFileInfo *zfinext = zfi->nxt;
+    if (zfi->cextra!=0) delete[] zfi->cextra;
+    delete zfi;
+    zfi = zfinext;
+  }
+  ulg center_size = writ - pos_at_start_of_central;
+  if (okay)
+  { int res = putend(numentries, center_size, pos_at_start_of_central+ooffset, 0, NULL, swrite,this);
+    if (res!=ZE_OK) okay=false;
+    writ += 4 + ENDHEAD + 0;
+  }
+  if (!okay) return ZR_WRITE;
+  return ZR_OK;
+}
+
+
+
+
+
+ZRESULT lasterrorZ=ZR_OK;
+
+unsigned int FormatZipMessageZ(ZRESULT code, char *buf,unsigned int len)
+{ if (code==ZR_RECENT) code=lasterrorZ;
+  const char *msg="unknown zip result code";
+  switch (code)
+  { case ZR_OK: msg="Success"; break;
+    case ZR_NODUPH: msg="Culdn't duplicate handle"; break;
+    case ZR_NOFILE: msg="Couldn't create/open file"; break;
+    case ZR_NOALLOC: msg="Failed to allocate memory"; break;
+    case ZR_WRITE: msg="Error writing to file"; break;
+    case ZR_NOTFOUND: msg="File not found in the zipfile"; break;
+    case ZR_MORE: msg="Still more data to unzip"; break;
+    case ZR_CORRUPT: msg="Zipfile is corrupt or not a zipfile"; break;
+    case ZR_READ: msg="Error reading file"; break;
+    case ZR_ARGS: msg="Caller: faulty arguments"; break;
+    case ZR_PARTIALUNZ: msg="Caller: the file had already been partially unzipped"; break;
+    case ZR_NOTMMAP: msg="Caller: can only get memory of a memory zipfile"; break;
+    case ZR_MEMSIZE: msg="Caller: not enough space allocated for memory zipfile"; break;
+    case ZR_FAILED: msg="Caller: there was a previous error"; break;
+    case ZR_ENDED: msg="Caller: additions to the zip have already been ended"; break;
+    case ZR_ZMODE: msg="Caller: mixing creation and opening of zip"; break;
+    case ZR_NOTINITED: msg="Zip-bug: internal initialisation not completed"; break;
+    case ZR_SEEK: msg="Zip-bug: trying to seek the unseekable"; break;
+    case ZR_MISSIZE: msg="Zip-bug: the anticipated size turned out wrong"; break;
+    case ZR_NOCHANGE: msg="Zip-bug: tried to change mind, but not allowed"; break;
+    case ZR_FLATE: msg="Zip-bug: an internal error during flation"; break;
+  }
+  unsigned int mlen=(unsigned int)strlen(msg);
+  if (buf==0 || len==0) return mlen;
+  unsigned int n=mlen; if (n+1>len) n=len-1;
+  strncpy(buf,msg,n); buf[n]=0;
+  return mlen;
+}
+
+
+
+typedef struct
+{ DWORD flag;
+  TZip *zip;
+} TZipHandleData;
+
+
+HZIP CreateZipZ(void *z,unsigned int len,DWORD flags)
+{ 
+	tzset();
+	TZip *zip = new TZip();
+	lasterrorZ = zip->Create(z,len,flags);
+	if (lasterrorZ != ZR_OK) 
+	{
+		delete zip; 
+		return 0;
+	}
+	TZipHandleData *han = new TZipHandleData;
+	han->flag = 2; 
+	han->zip = zip; 
+	return (HZIP)han;
+}
+
+ZRESULT ZipAdd(HZIP hz, const TCHAR *dstzn, void *src, unsigned int len, DWORD flags)
+{ 
+	if (hz == 0) 
+	{
+		lasterrorZ = ZR_ARGS;
+		return ZR_ARGS;
+	}
+	TZipHandleData *han = (TZipHandleData*)hz;
+	if (han->flag != 2) 
+	{
+		lasterrorZ = ZR_ZMODE;
+		return ZR_ZMODE;
+	}
+	TZip *zip = han->zip;
+
+
+	if (flags == ZIP_FILENAME)
+	{
+		char szDest[MAX_PATH*2];
+		memset(szDest, 0, sizeof(szDest));
+
+#ifdef _UNICODE
+		// need to convert Unicode dest to ANSI
+		int nActualChars = WideCharToMultiByte(CP_ACP,	// code page
+								0,						// performance and mapping flags
+								(LPCWSTR) dstzn,		// wide-character string
+								-1,						// number of chars in string
+								szDest,					// buffer for new string
+								MAX_PATH*2-2,			// size of buffer
+								NULL,					// default for unmappable chars
+								NULL);					// set when default char used
+		if (nActualChars == 0)
+			return ZR_ARGS; 
+#else
+		strcpy(szDest, dstzn);
+#endif
+
+		lasterrorZ = zip->Add(szDest, src, len, flags);
+	}
+	else
+	{
+		lasterrorZ = zip->Add((char *)dstzn, src, len, flags);
+	}
+
+	return lasterrorZ;
+}
+
+ZRESULT ZipGetMemory(HZIP hz, void **buf, unsigned long *len)
+{ if (hz==0) {if (buf!=0) *buf=0; if (len!=0) *len=0; lasterrorZ=ZR_ARGS;return ZR_ARGS;}
+  TZipHandleData *han = (TZipHandleData*)hz;
+  if (han->flag!=2) {lasterrorZ=ZR_ZMODE;return ZR_ZMODE;}
+  TZip *zip = han->zip;
+  lasterrorZ = zip->GetMemory(buf,len);
+  return lasterrorZ;
+}
+
+ZRESULT CloseZipZ(HZIP hz)
+{ if (hz==0) {lasterrorZ=ZR_ARGS;return ZR_ARGS;}
+  TZipHandleData *han = (TZipHandleData*)hz;
+  if (han->flag!=2) {lasterrorZ=ZR_ZMODE;return ZR_ZMODE;}
+  TZip *zip = han->zip;
+  lasterrorZ = zip->Close();
+  delete zip;
+  delete han;
+  return lasterrorZ;
+}
+
+bool IsZipHandleZ(HZIP hz)
+{ if (hz==0) return true;
+  TZipHandleData *han = (TZipHandleData*)hz;
+  return (han->flag==2);
+}
+
+//+++1.2
+/**
+* Added by Renaud Deysine. This fonctionnality was missing in API
+* @brief Add a folder to the zip file. Empty folders will also be added.
+* This method add recursively the content of a directory
+* @param AbsolutePath like "C:\\Windows" or "C:\\Windows\"
+* @param DirToAdd like "System32"
+*
+*/
+BOOL AddFolderContent(HZIP hZip, TCHAR* AbsolutePath, TCHAR* DirToAdd)
+{
+	HANDLE hFind; // file handle
+	WIN32_FIND_DATA FindFileData;
+	TCHAR PathToSearchInto [MAX_PATH] = {0};
+	
+	if (NULL != DirToAdd)
+	{
+		ZipAdd(hZip, DirToAdd, 0, 0, ZIP_FOLDER);
+	}
+	
+	// Construct the path to search into "C:\\Windows\\System32\\*"
+	_tcscpy(PathToSearchInto, AbsolutePath);
+	_tcscat(PathToSearchInto, _T("\\"));
+	_tcscat(PathToSearchInto, DirToAdd);
+	_tcscat(PathToSearchInto, _T("\\*"));
+	
+	hFind = FindFirstFile(PathToSearchInto,&FindFileData); // find the first file
+	if(hFind == INVALID_HANDLE_VALUE)
+	{
+		return FALSE;
+	}
+	
+	bool bSearch = true;
+	while(bSearch) // until we finds an entry
+	{
+		if(FindNextFile(hFind,&FindFileData))
+		{
+			// Don't care about . and ..
+			//if(IsDots(FindFileData.cFileName))
+			if ((_tcscmp(FindFileData.cFileName, _T(".")) == 0) ||
+				(_tcscmp(FindFileData.cFileName, _T("..")) == 0))
+				continue;
+			
+			// We have found a directory
+			if((FindFileData.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY))
+			{
+				TCHAR RelativePathNewDirFound[MAX_PATH] = {0};
+				_tcscat(RelativePathNewDirFound, DirToAdd);
+				_tcscat(RelativePathNewDirFound, _T("\\"));
+				_tcscat(RelativePathNewDirFound, FindFileData.cFileName);
+				
+				// Recursive call with the new directory found
+				if (AddFolderContent(hZip, AbsolutePath, RelativePathNewDirFound)== FALSE)
+				{
+					return FALSE ;
+				}
+				
+			}
+			// We have found a file
+			else
+			{
+				// Add the found file to the zip file
+				TCHAR RelativePathNewFileFound[MAX_PATH] = {0};
+				_tcscpy(RelativePathNewFileFound, DirToAdd);
+				_tcscat(RelativePathNewFileFound, _T("\\"));
+				_tcscat(RelativePathNewFileFound, FindFileData.cFileName);
+				
+				if (ZipAdd(hZip, RelativePathNewFileFound, RelativePathNewFileFound, 0, ZIP_FILENAME) != ZR_OK)
+				{
+					return FALSE;
+				}
+			}
+			
+		}//FindNextFile
+		else
+		{
+			if(GetLastError() == ERROR_NO_MORE_FILES) // no more files there
+				bSearch = false;
+			else {
+				// some error occured, close the handle and return FALSE
+				FindClose(hFind);
+				return FALSE;
+			}
+		}
+	}//while
+	
+	FindClose(hFind); // closing file handle
+	return true;
+	
+}
+
author	Mounir IDRASSI <mounir.idrassi@idrix.fr>	2016-08-14 02:20:42 +0200
committer	Mounir IDRASSI <mounir.idrassi@idrix.fr>	2016-08-15 01:09:16 +0200
commit	4cf9db9f9556ab1127f5bce91db6c02028637b57 (patch)
tree	2f83feeca3fa92a4fbed8f55c00e41c40072f9ea /src/Common/XZip.cpp
parent	c4d4ade9d00e65112b93640bd3a0eeb50279a202 (diff)
download	VeraCrypt-4cf9db9f9556ab1127f5bce91db6c02028637b57.tar.gz VeraCrypt-4cf9db9f9556ab1127f5bce91db6c02028637b57.zip