/* zip_algorithm_deflate.c -- deflate (de)compression routines Copyright (C) 2017-2019 Dieter Baron and Thomas Klausner This file is part of libzip, a library to manipulate ZIP archives. The authors can be contacted at Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. 3. The names of the authors may not be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include "zipint.h" #include #include #include struct ctx { zip_error_t *error; bool compress; int compression_flags; bool end_of_input; z_stream zstr; }; static void * allocate(bool compress, int compression_flags, zip_error_t *error) { struct ctx *ctx; if ((ctx = (struct ctx *)malloc(sizeof(*ctx))) == NULL) { zip_error_set(error, ZIP_ET_SYS, errno); return NULL; } ctx->error = error; ctx->compress = compress; ctx->compression_flags = compression_flags; if (ctx->compression_flags < 1 || ctx->compression_flags > 9) { ctx->compression_flags = Z_BEST_COMPRESSION; } ctx->end_of_input = false; ctx->zstr.zalloc = Z_NULL; ctx->zstr.zfree = Z_NULL; ctx->zstr.opaque = NULL; return ctx; } static void * compress_allocate(zip_uint16_t method, int compression_flags, zip_error_t *error) { return allocate(true, compression_flags, error); } static void * decompress_allocate(zip_uint16_t method, int compression_flags, zip_error_t *error) { return allocate(false, compression_flags, error); } static void deallocate(void *ud) { struct ctx *ctx = (struct ctx *)ud; free(ctx); } static zip_uint16_t general_purpose_bit_flags(void *ud) { struct ctx *ctx = (struct ctx *)ud; if (!ctx->compress) { return 0; } if (ctx->compression_flags < 3) { return 2 << 1; } else if (ctx->compression_flags > 7) { return 1 << 1; } return 0; } static bool start(void *ud) { struct ctx *ctx = (struct ctx *)ud; int ret; ctx->zstr.avail_in = 0; ctx->zstr.next_in = NULL; ctx->zstr.avail_out = 0; ctx->zstr.next_out = NULL; if (ctx->compress) { /* negative value to tell zlib not to write a header */ ret = deflateInit2(&ctx->zstr, ctx->compression_flags, Z_DEFLATED, -MAX_WBITS, MAX_MEM_LEVEL, Z_DEFAULT_STRATEGY); } else { ret = inflateInit2(&ctx->zstr, -MAX_WBITS); } if (ret != Z_OK) { zip_error_set(ctx->error, ZIP_ER_ZLIB, ret); return false; } return true; } static bool end(void *ud) { struct ctx *ctx = (struct ctx *)ud; int err; if (ctx->compress) { err = deflateEnd(&ctx->zstr); } else { err = inflateEnd(&ctx->zstr); } if (err != Z_OK) { zip_error_set(ctx->error, ZIP_ER_ZLIB, err); return false; } return true; } static bool input(void *ud, zip_uint8_t *data, zip_uint64_t length) { struct ctx *ctx = (struct ctx *)ud; if (length > UINT_MAX || ctx->zstr.avail_in > 0) { zip_error_set(ctx->error, ZIP_ER_INVAL, 0); return false; } ctx->zstr.avail_in = (uInt)length; ctx->zstr.next_in = (Bytef *)data; return true; } static void end_of_input(void *ud) { struct ctx *ctx = (struct ctx *)ud; ctx->end_of_input = true; } static zip_compression_status_t process(void *ud, zip_uint8_t *data, zip_uint64_t *length) { struct ctx *ctx = (struct ctx *)ud; int ret; ctx->zstr.avail_out = (uInt)ZIP_MIN(UINT_MAX, *length); ctx->zstr.next_out = (Bytef *)data; if (ctx->compress) { ret = deflate(&ctx->zstr, ctx->end_of_input ? Z_FINISH : 0); } else { ret = inflate(&ctx->zstr, Z_SYNC_FLUSH); } *length = *length - ctx->zstr.avail_out; switch (ret) { case Z_OK: return ZIP_COMPRESSION_OK; case Z_STREAM_END: return ZIP_COMPRESSION_END; case Z_BUF_ERROR: if (ctx->zstr.avail_in == 0) { return ZIP_COMPRESSION_NEED_DATA; } /* fallthrough */ default: zip_error_set(ctx->error, ZIP_ER_ZLIB, ret); return ZIP_COMPRESSION_ERROR; } } /* clang-format off */ zip_
/*
  zip_fopen.c -- open file in zip archive for reading
  Copyright (C) 1999-2014 Dieter Baron and Thomas Klausner

  This file is part of libzip, a library to manipulate ZIP archives.
  The authors can be contacted at <libzip@nih.at>

  Redistribution and use in source and binary forms, with or without
  modification, are permitted provided that the following conditions
  are met:
  1. Redistributions of source code must retain the above copyright
     notice, this list of conditions and the following disclaimer.
  2. Redistributions in binary form must reproduce the above copyright
     notice, this list of conditions and the following disclaimer in
     the documentation and/or other materials provided with the
     distribution.
  3. The names of the authors may not be used to endorse or promote
     products derived from this software without specific prior
     written permission.
 
  THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS
  OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
  GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
  IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
  IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/


#include "zipint.h"


ZIP_EXTERN zip_file_t *
zip_fopen(zip_t *za, const char *fname, zip_flags_t flags)
{
    zip_int64_t idx;

    if ((idx=zip_name_locate(za, fname, flags)) < 0)
	return NULL;

    return zip_fopen_index_encrypted(za, (zip_uint64_t)idx, flags, za->default_password);
}