/* zip_close.c -- close zip archive and update changes Copyright (C) 1999-2016 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" #include <stdio.h> #include <stdlib.h> #include <string.h> #ifdef HAVE_STRINGS_H #include <strings.h> #endif #ifdef HAVE_UNISTD_H #include <unistd.h> #endif #include <sys/types.h> #include <sys/stat.h> #ifdef _WIN32 #include <io.h> #include <fcntl.h> #endif /* max deflate size increase: size + ceil(size/16k)*5+6 */ #define MAX_DEFLATE_SIZE_32 4293656963u static int add_data(zip_t *, zip_source_t *, zip_dirent_t *); static int copy_data(zip_t *, zip_uint64_t); static int copy_source(zip_t *, zip_source_t *); static int write_cdir(zip_t *, const zip_filelist_t *, zip_uint64_t); ZIP_EXTERN int zip_close(zip_t *za) { zip_uint64_t i, j, survivors; zip_int64_t off; int error; zip_filelist_t *filelist; int changed; if (za == NULL) return -1; changed = _zip_changed(za, &survivors); /* don't create zip files with no entries */ if (survivors == 0) { if ((za->open_flags & ZIP_TRUNCATE) || changed) { if (zip_source_remove(za->src) < 0) { _zip_error_set_from_source(&za->error, za->src); return -1; } } zip_discard(za); return 0; } if (!changed) { zip_discard(za); return 0; } if (survivors > za->nentry) { zip_error_set(&za->error, ZIP_ER_INTERNAL, 0); return -1; } if ((filelist=(zip_filelist_t *)malloc(sizeof(filelist[0])*(size_t)survivors)) == NULL) return -1; /* create list of files with index into original archive */ for (i=j=0; i<za->nentry; i++) { if (za->entry[i].deleted) continue; if (j >= survivors) { free(filelist); zip_error_set(&za->error, ZIP_ER_INTERNAL, 0); return -1; } filelist[j].idx = i; j++; } if (j < survivors) { free(filelist); zip_error_set(&za->error, ZIP_ER_INTERNAL, 0); return -1; } if (zip_source_begin_write(za->src) < 0) { _zip_error_set_from_source(&za->error, za->src); free(filelist); return -1; } error = 0; for (j=0; j<survivors; j++) { int new_data; zip_entry_t *entry; zip_dirent_t *de; if (za->progress_callback) { za->progress_callback((double)j/survivors); } i = filelist[j].idx; entry = za->entry+i; new_data = (ZIP_ENTRY_DATA_CHANGED(entry) || ZIP_ENTRY_CHANGED(entry, ZIP_DIRENT_COMP_METHOD) || ZIP_ENTRY_CHANGED(entry, ZIP_DIRENT_ENCRYPTION_METHOD)); /* create new local directory entry */ if (entry->changes == NULL) { if ((entry->changes=_zip_dirent_clone(entry->orig)) == NULL) { zip_error_set(&za->error, ZIP_ER_MEMORY, 0); error = 1; break; } } de = entry->changes; if (_zip_read_local_ef(za, i) < 0) { error = 1; break; } if ((off = zip_source_tell_write(za->src)) < 0) { error = 1; break; } de->offset = (zip_uint64_t)off; if (new_data) { zip_source_t *zs; zs = NULL; if (!ZIP_ENTRY_DATA_CHANGED(entry)) { if ((zs=_zip_source_zip_new(za, za, i, ZIP_FL_UNCHANGED, 0, 0, NULL)) == NULL) { error = 1; break; } } /* add_data writes dirent */ if (add_data(za, zs ? zs : entry->source, de) < 0) { error = 1; if (zs) zip_source_free(zs); break; } if (zs) zip_source_free(zs); } else { zip_uint64_t offset; /* when copying data, all sizes are known -> no data descriptor needed */ de->bitflags &= (zip_uint16_t)~ZIP_GPBF_DATA_DESCRIPTOR; if (_zip_dirent_write(za, de, ZIP_FL_LOCAL) < 0) { error = 1; break; } if ((offset=_zip_file_get_offset(za, i, &za->error)) == 0) { error = 1; break; } if (zip_source_seek(za->src, (zip_int64_t)offset, SEEK_SET) < 0) { _zip_error_set_from_source(&za->error, za->src); error = 1; break; } if (copy_data(za, de->comp_size) < 0) { error = 1; break; } } } if (!error) { if (write_cdir(za, filelist, survivors) < 0) error = 1; } free(filelist); if (!error) { if (zip_source_commit_write(za->src) != 0) { _zip_error_set_from_source(&za->error, za->src); error = 1; } } if (error) { zip_source_rollback_write(za->src); return -1; } if (za->progress_callback) { za->progress_callback(1); } zip_discard(za); return 0; } static int add_data(zip_t *za, zip_source_t *src, zip_dirent_t *de) { zip_int64_t offstart, offdata, offend; struct zip_stat st; zip_source_t *src_final, *src_tmp; int ret; int is_zip64; zip_flags_t flags; bool needs_recompress, needs_decompress, needs_crc, needs_compress, needs_reencrypt, needs_decrypt, needs_encrypt; if (zip_source_stat(src, &st) < 0) { _zip_error_set_from_source(&za->error, src); return -1; } if ((st.valid & ZIP_STAT_COMP_METHOD) == 0) { st.valid |= ZIP_STAT_COMP_METHOD; st.comp_method = ZIP_CM_STORE; } if (ZIP_CM_IS_DEFAULT(de->comp_method) && st.comp_method != ZIP_CM_STORE) de->comp_method = st.comp_method; else if (de->comp_method == ZIP_CM_STORE && (st.valid & ZIP_STAT_SIZE)) { st.valid |= ZIP_STAT_COMP_SIZE; st.comp_size = st.size; } else { /* we'll recompress */ st.valid &= ~ZIP_STAT_COMP_SIZE; } if ((st.valid & ZIP_STAT_ENCRYPTION_METHOD) == 0) { st.valid |= ZIP_STAT_ENCRYPTION_METHOD; st.encryption_method = ZIP_EM_NONE; } flags = ZIP_EF_LOCAL; if ((st.valid & ZIP_STAT_SIZE) == 0) flags |= ZIP_FL_FORCE_ZIP64; else { de->uncomp_size = st.size; if ((st.valid & ZIP_STAT_COMP_SIZE) == 0) { if (( ((de->comp_method == ZIP_CM_DEFLATE || ZIP_CM_IS_DEFAULT(de->comp_method)) && st.size > MAX_DEFLATE_SIZE_32) || (de->comp_method != ZIP_CM_STORE && de->comp_method != ZIP_CM_DEFLATE && !ZIP_CM_IS_DEFAULT(de->comp_method)))) flags |= ZIP_FL_FORCE_ZIP64; } else de->comp_size = st.comp_size; } if ((offstart = zip_source_tell_write(za->src)) < 0) { return -1; } /* as long as we don't support non-seekable output, clear data descriptor bit */ de->bitflags &= (zip_uint16_t)~ZIP_GPBF_DATA_DESCRIPTOR; if ((is_zip64=_zip_dirent_write(za, de, flags)) < 0) return -1; needs_recompress = !((st.comp_method == de->comp_method) || (ZIP_CM_IS_DEFAULT(de->comp_method) && st.comp_method == ZIP_CM_DEFLATE)); needs_decompress = needs_recompress && (st.comp_method != ZIP_CM_STORE); needs_crc = (st.comp_method == ZIP_CM_STORE) || needs_decompress; needs_compress = needs_recompress && (de->comp_method != ZIP_CM_STORE); needs_reencrypt = needs_recompress || (de->changed & ZIP_DIRENT_PASSWORD) || (de->encryption_method != st.encryption_method); needs_decrypt = needs_reencrypt && (st.encryption_method != ZIP_EM_NONE); needs_encrypt = needs_reencrypt && (de->encryption_method != ZIP_EM_NONE); src_final = src; zip_source_keep(src_final); if (needs_decrypt) { zip_encryption_implementation impl; if ((impl = _zip_get_encryption_implementation(st.encryption_method, ZIP_CODEC_DECODE)) == NULL) { zip_error_set(&za->error, ZIP_ER_ENCRNOTSUPP, 0); zip_source_free(src_final); return -1; } if ((src_tmp = impl(za, src_final, st.encryption_method, ZIP_CODEC_DECODE, za->default_password)) == NULL) { /* error set by impl */ zip_source_free(src_final); return -1; } zip_source_free(src_final); src_final = src_tmp; } if (needs_decompress) { zip_compression_implementation comp_impl; if ((comp_impl = _zip_get_compression_implementation(st.comp_method, ZIP_CODEC_DECODE)) == NULL) { zip_error_set(&za->error, ZIP_ER_COMPNOTSUPP, 0); zip_source_free(src_final); return -1; } if ((src_tmp = comp_impl(za, src_final, st.comp_method, ZIP_CODEC_DECODE)) == NULL) { /* error set by comp_impl */ zip_source_free(src_final); return -1; } zip_source_free(src_final); src_final = src_tmp; } if (needs_crc) { if ((src_tmp = zip_source_crc(za, src_final, 0)) == NULL) { zip_source_free(src_final); return -1; } zip_source_free(src_final); src_final = src_tmp; } if (needs_compress) { zip_compression_implementation comp_impl; if ((comp_impl = _zip_get_compression_implementation(de->comp_method, ZIP_CODEC_ENCODE)) == NULL) { zip_error_set(&za->error, ZIP_ER_COMPNOTSUPP, 0); zip_source_free(src_final); return -1; } if ((src_tmp = comp_impl(za, src_final, de->comp_method, ZIP_CODEC_ENCODE)) == NULL) { zip_source_free(src_final); return -1; } zip_source_free(src_final); src_final = src_tmp; } if (needs_encrypt) { zip_encryption_implementation impl; const char *password = NULL; if (de->password) { password = de->password; } else if (za->default_password) { password = za->default_password; } if ((impl = _zip_get_encryption_implementation(de->encryption_method, ZIP_CODEC_ENCODE)) == NULL) { zip_error_set(&za->error, ZIP_ER_ENCRNOTSUPP, 0); zip_source_free(src_final); return -1; } if ((src_tmp = impl(za, src_final, de->encryption_method, ZIP_CODEC_ENCODE, password)) == NULL) { /* error set by impl */ zip_source_free(src_final); return -1; } zip_source_free(src_final); src_final = src_tmp; } if ((offdata = zip_source_tell_write(za->src)) < 0) { return -1; } ret = copy_source(za, src_final); if (zip_source_stat(src_final, &st) < 0) { ret = -1; } zip_source_free(src_final); if (ret < 0) { return -1; } if ((offend = zip_source_tell_write(za->src)) < 0) { return -1; } if (zip_source_seek_write(za->src, offstart, SEEK_SET) < 0) { _zip_error_set_from_source(&za->error, za->src); return -1; } if ((st.valid & (ZIP_STAT_COMP_METHOD|ZIP_STAT_CRC|ZIP_STAT_SIZE)) != (ZIP_STAT_COMP_METHOD|ZIP_STAT_CRC|ZIP_STAT_SIZE)) { zip_error_set(&za->error, ZIP_ER_INTERNAL, 0); return -1; } if ((de->changed & ZIP_DIRENT_LAST_MOD) == 0) { if (st.valid & ZIP_STAT_MTIME) de->last_mod = st.mtime; else time(&de->last_mod); } de->comp_method = st.comp_method; de->crc = st.crc; de->uncomp_size = st.size; de->comp_size = (zip_uint64_t)(offend - offdata); if ((ret=_zip_dirent_write(za, de, flags)) < 0) return -1; if (is_zip64 != ret) { /* Zip64 mismatch between preliminary file header written before data and final file header written afterwards */ zip_error_set(&za->error, ZIP_ER_INTERNAL, 0); return -1; } if (zip_source_seek_write(za->src, offend, SEEK_SET) < 0) { _zip_error_set_from_source(&za->error, za->src); return -1; } return 0; } static int copy_data(zip_t *za, zip_uint64_t len) { zip_uint8_t buf[BUFSIZE]; size_t n; while (len > 0) { n = len > sizeof(buf) ? sizeof(buf) : len; if (_zip_read(za->src, buf, n, &za->error) < 0) { return -1; } if (_zip_write(za, buf, n) < 0) { return -1; } len -= n; } return 0; } static int copy_source(zip_t *za, zip_source_t *src) { zip_uint8_t buf[BUFSIZE]; zip_int64_t n; int ret; if (zip_source_open(src) < 0) { _zip_error_set_from_source(&za->error, src); return -1; } ret = 0; while ((n=zip_source_read(src, buf, sizeof(buf))) > 0) { if (_zip_write(za, buf, (zip_uint64_t)n) < 0) { ret = -1; break; } } if (n < 0) { _zip_error_set_from_source(&za->error, src); ret = -1; } zip_source_close(src); return ret; } static int write_cdir(zip_t *za, const zip_filelist_t *filelist, zip_uint64_t survivors) { zip_int64_t cd_start, end, size; if ((cd_start = zip_source_tell_write(za->src)) < 0) { return -1; } if ((size=_zip_cdir_write(za, filelist, survivors)) < 0) { return -1; } if ((end = zip_source_tell_write(za->src)) < 0) { return -1; } return 0; } int _zip_changed(const zip_t *za, zip_uint64_t *survivorsp) { int changed; zip_uint64_t i, survivors; changed = 0; survivors = 0; if (za->comment_changed || za->ch_flags != za->flags) changed = 1; for (i=0; i<za->nentry; i++) { if (za->entry[i].deleted || za->entry[i].source || (za->entry[i].changes && za->entry[i].changes->changed != 0)) changed = 1; if (!za->entry[i].deleted) survivors++; } if (survivorsp) *survivorsp = survivors; return changed; }