diff options
Diffstat (limited to 'ext/zip/lib/zip_open.c')
| -rw-r--r-- | ext/zip/lib/zip_open.c | 858 |
1 files changed, 0 insertions, 858 deletions
diff --git a/ext/zip/lib/zip_open.c b/ext/zip/lib/zip_open.c deleted file mode 100644 index f088a72b8b..0000000000 --- a/ext/zip/lib/zip_open.c +++ /dev/null @@ -1,858 +0,0 @@ -/* - zip_open.c -- open zip archive by name - Copyright (C) 1999-2015 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 <sys/stat.h> -#include <limits.h> -#include <stdio.h> -#include <stdlib.h> -#include <string.h> - -#include "zipint.h" - -typedef enum { - EXISTS_ERROR = -1, - EXISTS_NOT = 0, - EXISTS_EMPTY, - EXISTS_NONEMPTY, -} exists_t; -static zip_t *_zip_allocate_new(zip_source_t *src, unsigned int flags, zip_error_t *error); -static zip_int64_t _zip_checkcons(zip_t *za, zip_cdir_t *cdir, zip_error_t *error); -static zip_cdir_t *_zip_find_central_dir(zip_t *za, zip_uint64_t len); -static exists_t _zip_file_exists(zip_source_t *src, zip_error_t *error); -static int _zip_headercomp(const zip_dirent_t *, const zip_dirent_t *); -static unsigned char *_zip_memmem(const unsigned char *, size_t, const unsigned char *, size_t); -static zip_cdir_t *_zip_read_cdir(zip_t *za, zip_buffer_t *buffer, zip_uint64_t buf_offset, zip_error_t *error); -static zip_cdir_t *_zip_read_eocd(zip_buffer_t *buffer, zip_uint64_t buf_offset, unsigned int flags, zip_error_t *error); -static zip_cdir_t *_zip_read_eocd64(zip_source_t *src, zip_buffer_t *buffer, zip_uint64_t buf_offset, unsigned int flags, zip_error_t *error); - - -ZIP_EXTERN zip_t * -zip_open(const char *fn, int _flags, int *zep) -{ - zip_t *za; - zip_source_t *src; - struct zip_error error; - - zip_error_init(&error); - if ((src = zip_source_file_create(fn, 0, -1, &error)) == NULL) { - _zip_set_open_error(zep, &error, 0); - zip_error_fini(&error); - return NULL; - } - - if ((za = zip_open_from_source(src, _flags, &error)) == NULL) { - zip_source_free(src); - _zip_set_open_error(zep, &error, 0); - zip_error_fini(&error); - return NULL; - } - - zip_error_fini(&error); - return za; -} - - -ZIP_EXTERN zip_t * -zip_open_from_source(zip_source_t *src, int _flags, zip_error_t *error) -{ - static zip_int64_t needed_support_read = -1; - static zip_int64_t needed_support_write = -1; - - unsigned int flags; - zip_int64_t supported; - exists_t exists; - - if (_flags < 0 || src == NULL) { - zip_error_set(error, ZIP_ER_INVAL, 0); - return NULL; - } - flags = (unsigned int)_flags; - - supported = zip_source_supports(src); - if (needed_support_read == -1) { - needed_support_read = zip_source_make_command_bitmap(ZIP_SOURCE_OPEN, ZIP_SOURCE_READ, ZIP_SOURCE_CLOSE, ZIP_SOURCE_SEEK, ZIP_SOURCE_TELL, ZIP_SOURCE_STAT, -1); - needed_support_write = zip_source_make_command_bitmap(ZIP_SOURCE_BEGIN_WRITE, ZIP_SOURCE_COMMIT_WRITE, ZIP_SOURCE_ROLLBACK_WRITE, ZIP_SOURCE_SEEK_WRITE, ZIP_SOURCE_TELL_WRITE, ZIP_SOURCE_REMOVE, -1); - } - if ((supported & needed_support_read) != needed_support_read) { - zip_error_set(error, ZIP_ER_OPNOTSUPP, 0); - return NULL; - } - if ((supported & needed_support_write) != needed_support_write) { - flags |= ZIP_RDONLY; - } - - if ((flags & (ZIP_RDONLY|ZIP_TRUNCATE)) == (ZIP_RDONLY|ZIP_TRUNCATE)) { - zip_error_set(error, ZIP_ER_RDONLY, 0); - return NULL; - } - - exists = _zip_file_exists(src, error); - switch (exists) { - case EXISTS_ERROR: - return NULL; - - case EXISTS_NOT: - if ((flags & ZIP_CREATE) == 0) { - zip_error_set(error, ZIP_ER_NOENT, 0); - return NULL; - } - return _zip_allocate_new(src, flags, error); - - default: { - zip_t *za; - if (flags & ZIP_EXCL) { - zip_error_set(error, ZIP_ER_EXISTS, 0); - return NULL; - } - if (zip_source_open(src) < 0) { - _zip_error_set_from_source(error, src); - return NULL; - } - - if (flags & ZIP_TRUNCATE) { - za = _zip_allocate_new(src, flags, error); - } - else { - /* ZIP_CREATE gets ignored if file exists and not ZIP_EXCL, just like open() */ - za = _zip_open(src, flags, error); - } - - if (za == NULL) { - zip_source_close(src); - return NULL; - } - return za; - } - } -} - -ZIP_EXTERN int -zip_archive_set_tempdir(zip_t *za, const char *tempdir) -{ - char *new_tempdir; - - if (tempdir) { - if ((new_tempdir = strdup(tempdir)) == NULL) { - zip_error_set(&za->error, ZIP_ER_MEMORY, errno); - return -1; - } - } - else - new_tempdir = NULL; - - free(za->tempdir); - za->tempdir = new_tempdir; - - return 0; -} - -zip_t * -_zip_open(zip_source_t *src, unsigned int flags, zip_error_t *error) -{ - zip_t *za; - zip_cdir_t *cdir; - struct zip_stat st; - zip_uint64_t len, idx; - - zip_stat_init(&st); - if (zip_source_stat(src, &st) < 0) { - _zip_error_set_from_source(error, src); - return NULL; - } - if ((st.valid & ZIP_STAT_SIZE) == 0) { - zip_error_set(error, ZIP_ER_SEEK, EOPNOTSUPP); - return NULL; - } - len = st.size; - - /* treat empty files as empty archives */ - if (len == 0) { - if ((za=_zip_allocate_new(src, flags, error)) == NULL) { - zip_source_free(src); - return NULL; - } - - return za; - } - - if ((za=_zip_allocate_new(src, flags, error)) == NULL) { - return NULL; - } - - if ((cdir = _zip_find_central_dir(za, len)) == NULL) { - _zip_error_copy(error, &za->error); - /* keep src so discard does not get rid of it */ - zip_source_keep(src); - zip_discard(za); - return NULL; - } - - za->entry = cdir->entry; - za->nentry = cdir->nentry; - za->nentry_alloc = cdir->nentry_alloc; - za->comment_orig = cdir->comment; - - free(cdir); - - for (idx = 0; idx < za->nentry; idx++) { - const zip_uint8_t *name = _zip_string_get(za->entry[idx].orig->filename, NULL, 0, error); - if (name == NULL) { - /* keep src so discard does not get rid of it */ - zip_source_keep(src); - zip_discard(za); - return NULL; - } - - if (_zip_hash_add(za->names, name, idx, ZIP_FL_UNCHANGED, &za->error) == false) { - if (za->error.zip_err != ZIP_ER_EXISTS || (flags & ZIP_CHECKCONS)) { - _zip_error_copy(error, &za->error); - /* keep src so discard does not get rid of it */ - zip_source_keep(src); - zip_discard(za); - return NULL; - } - } - } - - za->ch_flags = za->flags; - - return za; -} - - -void -_zip_set_open_error(int *zep, const zip_error_t *err, int ze) -{ - if (err) { - ze = zip_error_code_zip(err); - if (zip_error_system_type(err) == ZIP_ET_SYS) { - errno = zip_error_code_system(err); - } - } - - if (zep) - *zep = ze; -} - - -/* _zip_readcdir: - tries to find a valid end-of-central-directory at the beginning of - buf, and then the corresponding central directory entries. - Returns a struct zip_cdir which contains the central directory - entries, or NULL if unsuccessful. */ - -static zip_cdir_t * -_zip_read_cdir(zip_t *za, zip_buffer_t *buffer, zip_uint64_t buf_offset, zip_error_t *error) -{ - zip_cdir_t *cd; - zip_uint16_t comment_len; - zip_uint64_t i, left; - zip_uint64_t eocd_offset = _zip_buffer_offset(buffer); - zip_buffer_t *cd_buffer; - - if (_zip_buffer_left(buffer) < EOCDLEN) { - /* not enough bytes left for comment */ - zip_error_set(error, ZIP_ER_NOZIP, 0); - return NULL; - } - - /* check for end-of-central-dir magic */ - if (memcmp(_zip_buffer_get(buffer, 4), EOCD_MAGIC, 4) != 0) { - zip_error_set(error, ZIP_ER_NOZIP, 0); - return NULL; - } - - if (eocd_offset >= EOCD64LOCLEN && memcmp(_zip_buffer_data(buffer) + eocd_offset - EOCD64LOCLEN, EOCD64LOC_MAGIC, 4) == 0) { - _zip_buffer_set_offset(buffer, eocd_offset - EOCD64LOCLEN); - cd = _zip_read_eocd64(za->src, buffer, buf_offset, za->flags, error); - } - else { - _zip_buffer_set_offset(buffer, eocd_offset); - cd = _zip_read_eocd(buffer, buf_offset, za->flags, error); - } - - if (cd == NULL) - return NULL; - - _zip_buffer_set_offset(buffer, eocd_offset + 20); - comment_len = _zip_buffer_get_16(buffer); - - if (cd->offset + cd->size > buf_offset + eocd_offset) { - /* cdir spans past EOCD record */ - zip_error_set(error, ZIP_ER_INCONS, 0); - _zip_cdir_free(cd); - return NULL; - } - - if (comment_len || (za->open_flags & ZIP_CHECKCONS)) { - zip_uint64_t tail_len; - - _zip_buffer_set_offset(buffer, eocd_offset + EOCDLEN); - tail_len = _zip_buffer_left(buffer); - - if (tail_len < comment_len || ((za->open_flags & ZIP_CHECKCONS) && tail_len != comment_len)) { - zip_error_set(error, ZIP_ER_INCONS, 0); - _zip_cdir_free(cd); - return NULL; - } - - if (comment_len) { - if ((cd->comment=_zip_string_new(_zip_buffer_get(buffer, comment_len), comment_len, ZIP_FL_ENC_GUESS, error)) == NULL) { - _zip_cdir_free(cd); - return NULL; - } - } - } - - if (cd->offset >= buf_offset) { - zip_uint8_t *data; - /* if buffer already read in, use it */ - _zip_buffer_set_offset(buffer, cd->offset - buf_offset); - - if ((data = _zip_buffer_get(buffer, cd->size)) == NULL) { - zip_error_set(error, ZIP_ER_INCONS, 0); - _zip_cdir_free(cd); - return NULL; - } - if ((cd_buffer = _zip_buffer_new(data, cd->size)) == NULL) { - zip_error_set(error, ZIP_ER_MEMORY, 0); - _zip_cdir_free(cd); - return NULL; - } - } - else { - cd_buffer = NULL; - - if (zip_source_seek(za->src, (zip_int64_t)cd->offset, SEEK_SET) < 0) { - _zip_error_set_from_source(error, za->src); - _zip_cdir_free(cd); - return NULL; - } - - /* possible consistency check: cd->offset = len-(cd->size+cd->comment_len+EOCDLEN) ? */ - if (zip_source_tell(za->src) != (zip_int64_t)cd->offset) { - zip_error_set(error, ZIP_ER_NOZIP, 0); - _zip_cdir_free(cd); - return NULL; - } - } - - left = (zip_uint64_t)cd->size; - i=0; - while (i<cd->nentry && left > 0) { - zip_int64_t entry_size; - if ((cd->entry[i].orig=_zip_dirent_new()) == NULL || (entry_size = _zip_dirent_read(cd->entry[i].orig, za->src, cd_buffer, false, error)) < 0) { - _zip_cdir_free(cd); - _zip_buffer_free(cd_buffer); - return NULL; - } - i++; - left -= (zip_uint64_t)entry_size; - } - - if (i != cd->nentry) { - zip_error_set(error, ZIP_ER_INCONS, 0); - _zip_buffer_free(cd_buffer); - _zip_cdir_free(cd); - return NULL; - } - - if (za->open_flags & ZIP_CHECKCONS) { - bool ok; - - if (cd_buffer) { - ok = _zip_buffer_eof(cd_buffer); - } - else { - zip_int64_t offset = zip_source_tell(za->src); - - if (offset < 0) { - _zip_error_set_from_source(error, za->src); - _zip_buffer_free(cd_buffer); - _zip_cdir_free(cd); - return NULL; - } - ok = ((zip_uint64_t)offset == cd->offset + cd->size); - } - - if (!ok) { - zip_error_set(error, ZIP_ER_INCONS, 0); - _zip_buffer_free(cd_buffer); - _zip_cdir_free(cd); - return NULL; - } - } - - _zip_buffer_free(cd_buffer); - return cd; -} - - -/* _zip_checkcons: - Checks the consistency of the central directory by comparing central - directory entries with local headers and checking for plausible - file and header offsets. Returns -1 if not plausible, else the - difference between the lowest and the highest fileposition reached */ - -static zip_int64_t -_zip_checkcons(zip_t *za, zip_cdir_t *cd, zip_error_t *error) -{ - zip_uint64_t i; - zip_uint64_t min, max, j; - struct zip_dirent temp; - - _zip_dirent_init(&temp); - if (cd->nentry) { - max = cd->entry[0].orig->offset; - min = cd->entry[0].orig->offset; - } - else - min = max = 0; - - for (i=0; i<cd->nentry; i++) { - if (cd->entry[i].orig->offset < min) - min = cd->entry[i].orig->offset; - if (min > (zip_uint64_t)cd->offset) { - zip_error_set(error, ZIP_ER_NOZIP, 0); - return -1; - } - - j = cd->entry[i].orig->offset + cd->entry[i].orig->comp_size - + _zip_string_length(cd->entry[i].orig->filename) + LENTRYSIZE; - if (j > max) - max = j; - if (max > (zip_uint64_t)cd->offset) { - zip_error_set(error, ZIP_ER_NOZIP, 0); - return -1; - } - - if (zip_source_seek(za->src, (zip_int64_t)cd->entry[i].orig->offset, SEEK_SET) < 0) { - _zip_error_set_from_source(error, za->src); - return -1; - } - - if (_zip_dirent_read(&temp, za->src, NULL, true, error) == -1) { - _zip_dirent_finalize(&temp); - return -1; - } - - if (_zip_headercomp(cd->entry[i].orig, &temp) != 0) { - zip_error_set(error, ZIP_ER_INCONS, 0); - _zip_dirent_finalize(&temp); - return -1; - } - - cd->entry[i].orig->extra_fields = _zip_ef_merge(cd->entry[i].orig->extra_fields, temp.extra_fields); - cd->entry[i].orig->local_extra_fields_read = 1; - temp.extra_fields = NULL; - - _zip_dirent_finalize(&temp); - } - - return (max-min) < ZIP_INT64_MAX ? (zip_int64_t)(max-min) : ZIP_INT64_MAX; -} - - -/* _zip_headercomp: - compares a central directory entry and a local file header - Return 0 if they are consistent, -1 if not. */ - -static int -_zip_headercomp(const zip_dirent_t *central, const zip_dirent_t *local) -{ - if ((central->version_needed != local->version_needed) -#if 0 - /* some zip-files have different values in local - and global headers for the bitflags */ - || (central->bitflags != local->bitflags) -#endif - || (central->comp_method != local->comp_method) - || (central->last_mod != local->last_mod) - || !_zip_string_equal(central->filename, local->filename)) - return -1; - - if ((central->crc != local->crc) || (central->comp_size != local->comp_size) - || (central->uncomp_size != local->uncomp_size)) { - /* InfoZip stores valid values in local header even when data descriptor is used. - This is in violation of the appnote. */ - if (((local->bitflags & ZIP_GPBF_DATA_DESCRIPTOR) == 0 - || local->crc != 0 || local->comp_size != 0 || local->uncomp_size != 0)) - return -1; - } - - return 0; -} - - -static zip_t * -_zip_allocate_new(zip_source_t *src, unsigned int flags, zip_error_t *error) -{ - zip_t *za; - - if ((za = _zip_new(error)) == NULL) { - return NULL; - } - - za->src = src; - za->open_flags = flags; - if (flags & ZIP_RDONLY) { - za->flags |= ZIP_AFL_RDONLY; - za->ch_flags |= ZIP_AFL_RDONLY; - } - return za; -} - - -/* - * tests for file existence - */ -static exists_t -_zip_file_exists(zip_source_t *src, zip_error_t *error) -{ - struct zip_stat st; - - zip_stat_init(&st); - if (zip_source_stat(src, &st) != 0) { - zip_error_t *src_error = zip_source_error(src); - if (zip_error_code_zip(src_error) == ZIP_ER_READ && zip_error_code_system(src_error) == ENOENT) { - return EXISTS_NOT; - } - _zip_error_copy(error, src_error); - return EXISTS_ERROR; - } - - return (st.valid & ZIP_STAT_SIZE) && st.size == 0 ? EXISTS_EMPTY : EXISTS_NONEMPTY; -} - - -static zip_cdir_t * -_zip_find_central_dir(zip_t *za, zip_uint64_t len) -{ - zip_cdir_t *cdir, *cdirnew; - zip_uint8_t *match; - zip_int64_t buf_offset; - zip_uint64_t buflen; - zip_int64_t a; - zip_int64_t best; - zip_error_t error; - zip_buffer_t *buffer; - - if (len < EOCDLEN) { - zip_error_set(&za->error, ZIP_ER_NOZIP, 0); - return NULL; - } - - buflen = (len < CDBUFSIZE ? len : CDBUFSIZE); - if (zip_source_seek(za->src, -(zip_int64_t)buflen, SEEK_END) < 0) { - zip_error_t *src_error = zip_source_error(za->src); - if (zip_error_code_zip(src_error) != ZIP_ER_SEEK || zip_error_code_system(src_error) != EFBIG) { - /* seek before start of file on my machine */ - _zip_error_copy(&za->error, src_error); - return NULL; - } - } - if ((buf_offset = zip_source_tell(za->src)) < 0) { - _zip_error_set_from_source(&za->error, za->src); - return NULL; - } - - if ((buffer = _zip_buffer_new_from_source(za->src, buflen, NULL, &za->error)) == NULL) { - return NULL; - } - - best = -1; - cdir = NULL; - if (buflen >= CDBUFSIZE) { - /* EOCD64 locator is before EOCD, so leave place for it */ - _zip_buffer_set_offset(buffer, EOCD64LOCLEN); - } - zip_error_set(&error, ZIP_ER_NOZIP, 0); - - match = _zip_buffer_get(buffer, 0); - while ((match=_zip_memmem(match, _zip_buffer_left(buffer)-(EOCDLEN-4), (const unsigned char *)EOCD_MAGIC, 4)) != NULL) { - _zip_buffer_set_offset(buffer, (zip_uint64_t)(match - _zip_buffer_data(buffer))); - if ((cdirnew = _zip_read_cdir(za, buffer, (zip_uint64_t)buf_offset, &error)) != NULL) { - if (cdir) { - if (best <= 0) { - best = _zip_checkcons(za, cdir, &error); - } - - a = _zip_checkcons(za, cdirnew, &error); - if (best < a) { - _zip_cdir_free(cdir); - cdir = cdirnew; - best = a; - } - else { - _zip_cdir_free(cdirnew); - } - } - else { - cdir = cdirnew; - if (za->open_flags & ZIP_CHECKCONS) - best = _zip_checkcons(za, cdir, &error); - else { - best = 0; - } - } - cdirnew = NULL; - } - - match++; - _zip_buffer_set_offset(buffer, (zip_uint64_t)(match - _zip_buffer_data(buffer))); - } - - _zip_buffer_free(buffer); - - if (best < 0) { - _zip_error_copy(&za->error, &error); - _zip_cdir_free(cdir); - return NULL; - } - - return cdir; -} - - -static unsigned char * -_zip_memmem(const unsigned char *big, size_t biglen, const unsigned char *little, size_t littlelen) -{ - const unsigned char *p; - - if ((biglen < littlelen) || (littlelen == 0)) - return NULL; - p = big-1; - while ((p=(const unsigned char *) - memchr(p+1, little[0], (size_t)(big-(p+1))+(size_t)(biglen-littlelen)+1)) != NULL) { - if (memcmp(p+1, little+1, littlelen-1)==0) - return (unsigned char *)p; - } - - return NULL; -} - - -static zip_cdir_t * -_zip_read_eocd(zip_buffer_t *buffer, zip_uint64_t buf_offset, unsigned int flags, zip_error_t *error) -{ - zip_cdir_t *cd; - zip_uint64_t i, nentry, size, offset, eocd_offset; - - if (_zip_buffer_left(buffer) < EOCDLEN) { - zip_error_set(error, ZIP_ER_INCONS, 0); - return NULL; - } - - eocd_offset = _zip_buffer_offset(buffer); - - _zip_buffer_get(buffer, 4); /* magic already verified */ - - if (_zip_buffer_get_32(buffer) != 0) { - zip_error_set(error, ZIP_ER_MULTIDISK, 0); - return NULL; - } - - /* number of cdir-entries on this disk */ - i = _zip_buffer_get_16(buffer); - /* number of cdir-entries */ - nentry = _zip_buffer_get_16(buffer); - - if (nentry != i) { - zip_error_set(error, ZIP_ER_NOZIP, 0); - return NULL; - } - - size = _zip_buffer_get_32(buffer); - offset = _zip_buffer_get_32(buffer); - - if (offset+size < offset) { - zip_error_set(error, ZIP_ER_SEEK, EFBIG); - return NULL; - } - - if (offset+size > buf_offset + eocd_offset) { - /* cdir spans past EOCD record */ - zip_error_set(error, ZIP_ER_INCONS, 0); - return NULL; - } - - if ((flags & ZIP_CHECKCONS) && offset+size != buf_offset + eocd_offset) { - zip_error_set(error, ZIP_ER_INCONS, 0); - return NULL; - } - - if ((cd=_zip_cdir_new(nentry, error)) == NULL) - return NULL; - - cd->size = size; - cd->offset = offset; - - return cd; -} - - -static zip_cdir_t * -_zip_read_eocd64(zip_source_t *src, zip_buffer_t *buffer, zip_uint64_t buf_offset, unsigned int flags, zip_error_t *error) -{ - zip_cdir_t *cd; - zip_uint64_t offset; - zip_uint8_t eocd[EOCD64LEN]; - zip_uint64_t eocd_offset; - zip_uint64_t size, nentry, i, eocdloc_offset; - bool free_buffer; - zip_uint32_t num_disks, num_disks64, eocd_disk, eocd_disk64; - - eocdloc_offset = _zip_buffer_offset(buffer); - - _zip_buffer_get(buffer, 4); /* magic already verified */ - - num_disks = _zip_buffer_get_16(buffer); - eocd_disk = _zip_buffer_get_16(buffer); - eocd_offset = _zip_buffer_get_64(buffer); - - if (eocd_offset > ZIP_INT64_MAX || eocd_offset + EOCD64LEN < eocd_offset) { - zip_error_set(error, ZIP_ER_SEEK, EFBIG); - return NULL; - } - - if (eocd_offset + EOCD64LEN > eocdloc_offset + buf_offset) { - zip_error_set(error, ZIP_ER_INCONS, 0); - return NULL; - } - - if (eocd_offset >= buf_offset && eocd_offset + EOCD64LEN <= buf_offset + _zip_buffer_size(buffer)) { - _zip_buffer_set_offset(buffer, eocd_offset - buf_offset); - free_buffer = false; - } - else { - if (zip_source_seek(src, (zip_int64_t)eocd_offset, SEEK_SET) < 0) { - _zip_error_set_from_source(error, src); - return NULL; - } - if ((buffer = _zip_buffer_new_from_source(src, EOCD64LEN, eocd, error)) == NULL) { - return NULL; - } - free_buffer = true; - } - - if (memcmp(_zip_buffer_get(buffer, 4), EOCD64_MAGIC, 4) != 0) { - zip_error_set(error, ZIP_ER_INCONS, 0); - if (free_buffer) { - _zip_buffer_free(buffer); - } - return NULL; - } - - size = _zip_buffer_get_64(buffer); - - if ((flags & ZIP_CHECKCONS) && size + eocd_offset + 12 != buf_offset + eocdloc_offset) { - zip_error_set(error, ZIP_ER_INCONS, 0); - if (free_buffer) { - _zip_buffer_free(buffer); - } - return NULL; - } - - _zip_buffer_get(buffer, 4); /* skip version made by/needed */ - - num_disks64 = _zip_buffer_get_32(buffer); - eocd_disk64 = _zip_buffer_get_32(buffer); - - /* if eocd values are 0xffff, we have to use eocd64 values. - otherwise, if the values are not the same, it's inconsistent; - in any case, if the value is not 0, we don't support it */ - if (num_disks == 0xffff) { - num_disks = num_disks64; - } - if (eocd_disk == 0xffff) { - eocd_disk = eocd_disk64; - } - if ((flags & ZIP_CHECKCONS) && (eocd_disk != eocd_disk64 || num_disks != num_disks64)) { - zip_error_set(error, ZIP_ER_INCONS, 0); - return NULL; - } - if (num_disks != 0 || eocd_disk != 0) { - zip_error_set(error, ZIP_ER_MULTIDISK, 0); - return NULL; - } - - nentry = _zip_buffer_get_64(buffer); - i = _zip_buffer_get_64(buffer); - - if (nentry != i) { - zip_error_set(error, ZIP_ER_MULTIDISK, 0); - if (free_buffer) { - _zip_buffer_free(buffer); - } - return NULL; - } - - size = _zip_buffer_get_64(buffer); - offset = _zip_buffer_get_64(buffer); - - if (!_zip_buffer_ok(buffer)) { - zip_error_set(error, ZIP_ER_INTERNAL, 0); - if (free_buffer) { - _zip_buffer_free(buffer); - } - return NULL; - } - - if (free_buffer) { - _zip_buffer_free(buffer); - } - - if (offset > ZIP_INT64_MAX || offset+size < offset) { - zip_error_set(error, ZIP_ER_SEEK, EFBIG); - return NULL; - } - if (offset+size > buf_offset + eocd_offset) { - /* cdir spans past EOCD record */ - zip_error_set(error, ZIP_ER_INCONS, 0); - return NULL; - } - if ((flags & ZIP_CHECKCONS) && offset+size != buf_offset + eocd_offset) { - zip_error_set(error, ZIP_ER_INCONS, 0); - return NULL; - } - - if ((cd=_zip_cdir_new(nentry, error)) == NULL) - return NULL; - - - cd->size = size; - cd->offset = offset; - - return cd; -} |