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mz_zip.c
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/* zip.c -- Zip manipulation
part of the minizip-ng project
Copyright (C) Nathan Moinvaziri
https://github.com/zlib-ng/minizip-ng
Copyright (C) 2009-2010 Mathias Svensson
Modifications for Zip64 support
http://result42.com
Copyright (C) 2007-2008 Even Rouault
Modifications of Unzip for Zip64
Copyright (C) 1998-2010 Gilles Vollant
https://www.winimage.com/zLibDll/minizip.html
This program is distributed under the terms of the same license as zlib.
See the accompanying LICENSE file for the full text of the license.
*/
#include "mz.h"
#include "mz_crypt.h"
#include "mz_strm.h"
#ifdef HAVE_BZIP2
# include "mz_strm_bzip.h"
#endif
#ifdef HAVE_LIBCOMP
# include "mz_strm_libcomp.h"
#endif
#ifdef HAVE_LZMA
# include "mz_strm_lzma.h"
#endif
#include "mz_strm_mem.h"
#ifdef HAVE_PKCRYPT
# include "mz_strm_pkcrypt.h"
#endif
#ifdef HAVE_WZAES
# include "mz_strm_wzaes.h"
#endif
#ifdef HAVE_ZLIB
# include "mz_strm_zlib.h"
#endif
#ifdef HAVE_ZSTD
# include "mz_strm_zstd.h"
#endif
#include "mz_zip.h"
#include <ctype.h> /* tolower */
#include <stdio.h> /* snprintf */
#if defined(_MSC_VER) || defined(__MINGW32__)
# define localtime_r(t1, t2) (localtime_s(t2, t1) == 0 ? t1 : NULL)
#endif
#if defined(_MSC_VER) && (_MSC_VER < 1900)
# define snprintf _snprintf
#endif
/***************************************************************************/
#define MZ_ZIP_MAGIC_LOCALHEADER (0x04034b50)
#define MZ_ZIP_MAGIC_LOCALHEADERU8 {0x50, 0x4b, 0x03, 0x04}
#define MZ_ZIP_MAGIC_CENTRALHEADER (0x02014b50)
#define MZ_ZIP_MAGIC_CENTRALHEADERU8 {0x50, 0x4b, 0x01, 0x02}
#define MZ_ZIP_MAGIC_ENDHEADER (0x06054b50)
#define MZ_ZIP_MAGIC_ENDHEADERU8 {0x50, 0x4b, 0x05, 0x06}
#define MZ_ZIP_MAGIC_ENDHEADER64 (0x06064b50)
#define MZ_ZIP_MAGIC_ENDLOCHEADER64 (0x07064b50)
#define MZ_ZIP_MAGIC_DATADESCRIPTOR (0x08074b50)
#define MZ_ZIP_MAGIC_DATADESCRIPTORU8 {0x50, 0x4b, 0x07, 0x08}
#define MZ_ZIP_SIZE_LD_ITEM (30)
#define MZ_ZIP_SIZE_CD_ITEM (46)
#define MZ_ZIP_SIZE_CD_LOCATOR64 (20)
#define MZ_ZIP_SIZE_MAX_DATA_DESCRIPTOR (24)
#define MZ_ZIP_OFFSET_CRC_SIZES (14)
#define MZ_ZIP_UNCOMPR_SIZE64_CUSHION (2 * 1024 * 1024)
#ifndef MZ_ZIP_EOCD_MAX_BACK
# define MZ_ZIP_EOCD_MAX_BACK (1 << 20)
#endif
/***************************************************************************/
typedef struct mz_zip_s {
mz_zip_file file_info;
mz_zip_file local_file_info;
void *stream; /* main stream */
void *cd_stream; /* pointer to the stream with the cd */
void *cd_mem_stream; /* memory stream for central directory */
void *compress_stream; /* compression stream */
void *crypt_stream; /* encryption stream */
void *file_info_stream; /* memory stream for storing file info */
void *local_file_info_stream; /* memory stream for storing local file info */
int32_t open_mode;
uint8_t recover;
uint8_t data_descriptor;
uint32_t disk_number_with_cd; /* number of the disk with the central dir */
int64_t disk_offset_shift; /* correction for zips that have wrong offset start of cd */
int64_t cd_start_pos; /* pos of the first file in the central dir stream */
int64_t cd_current_pos; /* pos of the current file in the central dir */
int64_t cd_offset; /* offset of start of central directory */
int64_t cd_size; /* size of the central directory */
uint32_t cd_signature; /* signature of central directory */
uint8_t entry_scanned; /* entry header information read ok */
uint8_t entry_opened; /* entry is open for read/write */
uint8_t entry_raw; /* entry opened with raw mode */
uint32_t entry_crc32; /* entry crc32 */
uint64_t number_entry;
uint16_t version_madeby;
char *comment;
} mz_zip;
/***************************************************************************/
#if 0
# define mz_zip_print printf
#else
# define mz_zip_print(fmt, ...)
#endif
/***************************************************************************/
/* Locate the end of central directory */
static int32_t mz_zip_search_eocd(void *stream, int64_t *central_pos) {
int64_t file_size = 0;
int64_t max_back = MZ_ZIP_EOCD_MAX_BACK;
uint8_t find[4] = MZ_ZIP_MAGIC_ENDHEADERU8;
int32_t err = MZ_OK;
err = mz_stream_seek(stream, 0, MZ_SEEK_END);
if (err != MZ_OK)
return err;
file_size = mz_stream_tell(stream);
if (max_back <= 0 || max_back > file_size)
max_back = file_size;
return mz_stream_find_reverse(stream, (const void *)find, sizeof(find), max_back, central_pos);
}
/* Locate the end of central directory 64 of a zip file */
static int32_t mz_zip_search_zip64_eocd(void *stream, const int64_t end_central_offset, int64_t *central_pos) {
int64_t offset = 0;
uint32_t value32 = 0;
int32_t err = MZ_OK;
*central_pos = 0;
/* Zip64 end of central directory locator */
err = mz_stream_seek(stream, end_central_offset - MZ_ZIP_SIZE_CD_LOCATOR64, MZ_SEEK_SET);
/* Read locator signature */
if (err == MZ_OK) {
err = mz_stream_read_uint32(stream, &value32);
if (value32 != MZ_ZIP_MAGIC_ENDLOCHEADER64)
err = MZ_FORMAT_ERROR;
}
/* Number of the disk with the start of the zip64 end of central directory */
if (err == MZ_OK)
err = mz_stream_read_uint32(stream, &value32);
/* Relative offset of the zip64 end of central directory record8 */
if (err == MZ_OK)
err = mz_stream_read_uint64(stream, (uint64_t *)&offset);
/* Total number of disks */
if (err == MZ_OK)
err = mz_stream_read_uint32(stream, &value32);
/* Goto end of central directory record */
if (err == MZ_OK)
err = mz_stream_seek(stream, (int64_t)offset, MZ_SEEK_SET);
/* The signature */
if (err == MZ_OK) {
err = mz_stream_read_uint32(stream, &value32);
if (value32 != MZ_ZIP_MAGIC_ENDHEADER64)
err = MZ_FORMAT_ERROR;
}
if (err == MZ_OK)
*central_pos = offset;
return err;
}
#ifdef HAVE_PKCRYPT
/* Get PKWARE traditional encryption verifier */
static uint16_t mz_zip_get_pk_verify(uint32_t dos_date, uint64_t crc, uint16_t flag) {
/* Info-ZIP modification to ZipCrypto format: if bit 3 of the general
* purpose bit flag is set, it uses high byte of 16-bit File Time. */
if (flag & MZ_ZIP_FLAG_DATA_DESCRIPTOR)
return ((dos_date >> 16) & 0xff) << 8 | ((dos_date >> 8) & 0xff);
return ((crc >> 16) & 0xff) << 8 | ((crc >> 24) & 0xff);
}
#endif
/* Get info about the current file in the zip file */
static int32_t mz_zip_entry_read_header(void *stream, uint8_t local, mz_zip_file *file_info, void *file_extra_stream) {
uint64_t ntfs_time = 0;
uint32_t reserved = 0;
uint32_t magic = 0;
uint32_t dos_date = 0;
uint32_t field_pos = 0;
uint16_t field_type = 0;
uint16_t field_length = 0;
uint32_t field_length_read = 0;
uint16_t ntfs_attrib_id = 0;
uint16_t ntfs_attrib_size = 0;
uint16_t linkname_size;
uint16_t value16 = 0;
uint32_t value32 = 0;
int64_t extrafield_pos = 0;
int64_t comment_pos = 0;
int64_t linkname_pos = 0;
int64_t saved_pos = 0;
int32_t err = MZ_OK;
char *linkname = NULL;
memset(file_info, 0, sizeof(mz_zip_file));
/* Check the magic */
err = mz_stream_read_uint32(stream, &magic);
if (err == MZ_END_OF_STREAM)
err = MZ_END_OF_LIST;
else if (magic == MZ_ZIP_MAGIC_ENDHEADER || magic == MZ_ZIP_MAGIC_ENDHEADER64)
err = MZ_END_OF_LIST;
else if ((local) && (magic != MZ_ZIP_MAGIC_LOCALHEADER))
err = MZ_FORMAT_ERROR;
else if ((!local) && (magic != MZ_ZIP_MAGIC_CENTRALHEADER))
err = MZ_FORMAT_ERROR;
/* Read header fields */
if (err == MZ_OK) {
if (!local)
err = mz_stream_read_uint16(stream, &file_info->version_madeby);
if (err == MZ_OK)
err = mz_stream_read_uint16(stream, &file_info->version_needed);
if (err == MZ_OK)
err = mz_stream_read_uint16(stream, &file_info->flag);
if (err == MZ_OK)
err = mz_stream_read_uint16(stream, &file_info->compression_method);
if (err == MZ_OK) {
err = mz_stream_read_uint32(stream, &dos_date);
file_info->modified_date = mz_zip_dosdate_to_time_t(dos_date);
}
if (err == MZ_OK)
err = mz_stream_read_uint32(stream, &file_info->crc);
#ifdef HAVE_PKCRYPT
if (err == MZ_OK && file_info->flag & MZ_ZIP_FLAG_ENCRYPTED) {
/* Use dos_date from header instead of derived from time in zip extensions */
file_info->pk_verify = mz_zip_get_pk_verify(dos_date, file_info->crc, file_info->flag);
}
#endif
if (err == MZ_OK) {
err = mz_stream_read_uint32(stream, &value32);
file_info->compressed_size = value32;
}
if (err == MZ_OK) {
err = mz_stream_read_uint32(stream, &value32);
file_info->uncompressed_size = value32;
}
if (err == MZ_OK)
err = mz_stream_read_uint16(stream, &file_info->filename_size);
if (err == MZ_OK)
err = mz_stream_read_uint16(stream, &file_info->extrafield_size);
if (!local) {
if (err == MZ_OK)
err = mz_stream_read_uint16(stream, &file_info->comment_size);
if (err == MZ_OK) {
err = mz_stream_read_uint16(stream, &value16);
file_info->disk_number = value16;
}
if (err == MZ_OK)
err = mz_stream_read_uint16(stream, &file_info->internal_fa);
if (err == MZ_OK)
err = mz_stream_read_uint32(stream, &file_info->external_fa);
if (err == MZ_OK) {
err = mz_stream_read_uint32(stream, &value32);
file_info->disk_offset = value32;
}
}
}
if (err == MZ_OK)
err = mz_stream_seek(file_extra_stream, 0, MZ_SEEK_SET);
/* Copy variable length data to memory stream for later retrieval */
if ((err == MZ_OK) && (file_info->filename_size > 0))
err = mz_stream_copy(file_extra_stream, stream, file_info->filename_size);
mz_stream_write_uint8(file_extra_stream, 0);
extrafield_pos = mz_stream_tell(file_extra_stream);
if ((err == MZ_OK) && (file_info->extrafield_size > 0))
err = mz_stream_copy(file_extra_stream, stream, file_info->extrafield_size);
mz_stream_write_uint8(file_extra_stream, 0);
comment_pos = mz_stream_tell(file_extra_stream);
if ((err == MZ_OK) && (file_info->comment_size > 0))
err = mz_stream_copy(file_extra_stream, stream, file_info->comment_size);
mz_stream_write_uint8(file_extra_stream, 0);
linkname_pos = mz_stream_tell(file_extra_stream);
/* Overwrite if we encounter UNIX1 extra block */
mz_stream_write_uint8(file_extra_stream, 0);
if ((err == MZ_OK) && (file_info->extrafield_size > 0)) {
/* Seek to and parse the extra field */
err = mz_stream_seek(file_extra_stream, extrafield_pos, MZ_SEEK_SET);
while ((err == MZ_OK) && (field_pos + 4 <= file_info->extrafield_size)) {
err = mz_zip_extrafield_read(file_extra_stream, &field_type, &field_length);
if (err != MZ_OK)
break;
field_pos += 4;
/* Don't allow field length to exceed size of remaining extrafield */
if (field_length > (file_info->extrafield_size - field_pos))
field_length = (uint16_t)(file_info->extrafield_size - field_pos);
/* Read ZIP64 extra field */
if ((field_type == MZ_ZIP_EXTENSION_ZIP64) && (field_length >= 8)) {
if ((err == MZ_OK) && (file_info->uncompressed_size == UINT32_MAX)) {
err = mz_stream_read_int64(file_extra_stream, &file_info->uncompressed_size);
if (file_info->uncompressed_size < 0)
err = MZ_FORMAT_ERROR;
}
if ((err == MZ_OK) && (file_info->compressed_size == UINT32_MAX)) {
err = mz_stream_read_int64(file_extra_stream, &file_info->compressed_size);
if (file_info->compressed_size < 0)
err = MZ_FORMAT_ERROR;
}
if ((err == MZ_OK) && (file_info->disk_offset == UINT32_MAX)) {
err = mz_stream_read_int64(file_extra_stream, &file_info->disk_offset);
if (file_info->disk_offset < 0)
err = MZ_FORMAT_ERROR;
}
if ((err == MZ_OK) && (file_info->disk_number == UINT16_MAX))
err = mz_stream_read_uint32(file_extra_stream, &file_info->disk_number);
}
/* Read NTFS extra field */
else if ((field_type == MZ_ZIP_EXTENSION_NTFS) && (field_length > 4)) {
if (err == MZ_OK)
err = mz_stream_read_uint32(file_extra_stream, &reserved);
field_length_read = 4;
while ((err == MZ_OK) && (field_length_read + 4 <= field_length)) {
err = mz_stream_read_uint16(file_extra_stream, &ntfs_attrib_id);
if (err == MZ_OK)
err = mz_stream_read_uint16(file_extra_stream, &ntfs_attrib_size);
field_length_read += 4;
if ((err == MZ_OK) && (ntfs_attrib_id == 0x01) && (ntfs_attrib_size == 24)) {
err = mz_stream_read_uint64(file_extra_stream, &ntfs_time);
mz_zip_ntfs_to_unix_time(ntfs_time, &file_info->modified_date);
if (err == MZ_OK) {
err = mz_stream_read_uint64(file_extra_stream, &ntfs_time);
mz_zip_ntfs_to_unix_time(ntfs_time, &file_info->accessed_date);
}
if (err == MZ_OK) {
err = mz_stream_read_uint64(file_extra_stream, &ntfs_time);
mz_zip_ntfs_to_unix_time(ntfs_time, &file_info->creation_date);
}
} else if ((err == MZ_OK) && (field_length_read + ntfs_attrib_size <= field_length)) {
err = mz_stream_seek(file_extra_stream, ntfs_attrib_size, MZ_SEEK_CUR);
}
field_length_read += ntfs_attrib_size;
}
}
/* Read UNIX1 extra field */
else if ((field_type == MZ_ZIP_EXTENSION_UNIX1) && (field_length >= 12)) {
if (err == MZ_OK) {
err = mz_stream_read_uint32(file_extra_stream, &value32);
if (err == MZ_OK && file_info->accessed_date == 0)
file_info->accessed_date = value32;
}
if (err == MZ_OK) {
err = mz_stream_read_uint32(file_extra_stream, &value32);
if (err == MZ_OK && file_info->modified_date == 0)
file_info->modified_date = value32;
}
if (err == MZ_OK)
err = mz_stream_read_uint16(file_extra_stream, &value16); /* User id */
if (err == MZ_OK)
err = mz_stream_read_uint16(file_extra_stream, &value16); /* Group id */
/* Copy linkname to end of file extra stream so we can return null
terminated string */
linkname_size = field_length - 12;
if ((err == MZ_OK) && (linkname_size > 0)) {
linkname = (char *)malloc(linkname_size);
if (linkname) {
if (mz_stream_read(file_extra_stream, linkname, linkname_size) != linkname_size)
err = MZ_READ_ERROR;
if (err == MZ_OK) {
saved_pos = mz_stream_tell(file_extra_stream);
mz_stream_seek(file_extra_stream, linkname_pos, MZ_SEEK_SET);
mz_stream_write(file_extra_stream, linkname, linkname_size);
mz_stream_write_uint8(file_extra_stream, 0);
mz_stream_seek(file_extra_stream, saved_pos, MZ_SEEK_SET);
}
free(linkname);
}
}
}
#ifdef HAVE_WZAES
/* Read AES extra field */
else if ((field_type == MZ_ZIP_EXTENSION_AES) && (field_length == 7)) {
uint8_t value8 = 0;
/* Verify version info */
err = mz_stream_read_uint16(file_extra_stream, &value16);
/* Support AE-1 and AE-2 */
if (value16 != 1 && value16 != 2)
err = MZ_FORMAT_ERROR;
file_info->aes_version = value16;
if (err == MZ_OK)
err = mz_stream_read_uint8(file_extra_stream, &value8);
if ((char)value8 != 'A')
err = MZ_FORMAT_ERROR;
if (err == MZ_OK)
err = mz_stream_read_uint8(file_extra_stream, &value8);
if ((char)value8 != 'E')
err = MZ_FORMAT_ERROR;
/* Get AES encryption strength and actual compression method */
if (err == MZ_OK) {
err = mz_stream_read_uint8(file_extra_stream, &value8);
file_info->aes_strength = value8;
}
if (err == MZ_OK) {
err = mz_stream_read_uint16(file_extra_stream, &value16);
file_info->compression_method = value16;
}
}
#endif
else if (field_length > 0) {
err = mz_stream_seek(file_extra_stream, field_length, MZ_SEEK_CUR);
}
field_pos += field_length;
}
}
/* Get pointers to variable length data */
mz_stream_mem_get_buffer(file_extra_stream, (const void **)&file_info->filename);
mz_stream_mem_get_buffer_at(file_extra_stream, extrafield_pos, (const void **)&file_info->extrafield);
mz_stream_mem_get_buffer_at(file_extra_stream, comment_pos, (const void **)&file_info->comment);
mz_stream_mem_get_buffer_at(file_extra_stream, linkname_pos, (const void **)&file_info->linkname);
/* Set to empty string just in-case */
if (!file_info->filename)
file_info->filename = "";
if (!file_info->extrafield)
file_info->extrafield_size = 0;
if (!file_info->comment)
file_info->comment = "";
if (!file_info->linkname)
file_info->linkname = "";
if (err == MZ_OK) {
mz_zip_print("Zip - Entry - Read header - %s (local %" PRId8 ")\n", file_info->filename, local);
mz_zip_print("Zip - Entry - Read header compress (ucs %" PRId64 " cs %" PRId64 " crc 0x%08" PRIx32 ")\n",
file_info->uncompressed_size, file_info->compressed_size, file_info->crc);
if (!local) {
mz_zip_print("Zip - Entry - Read header disk (disk %" PRIu32 " offset %" PRId64 ")\n",
file_info->disk_number, file_info->disk_offset);
}
mz_zip_print("Zip - Entry - Read header variable (fnl %" PRId32 " efs %" PRId32 " cms %" PRId32 ")\n",
file_info->filename_size, file_info->extrafield_size, file_info->comment_size);
}
return err;
}
static int32_t mz_zip_entry_read_descriptor(void *stream, uint8_t zip64, uint32_t *crc32, int64_t *compressed_size,
int64_t *uncompressed_size) {
uint32_t value32 = 0;
int64_t value64 = 0;
int32_t err = MZ_OK;
err = mz_stream_read_uint32(stream, &value32);
if (value32 != MZ_ZIP_MAGIC_DATADESCRIPTOR)
err = MZ_FORMAT_ERROR;
if (err == MZ_OK)
err = mz_stream_read_uint32(stream, &value32);
if (err == MZ_OK && crc32)
*crc32 = value32;
if (err == MZ_OK) {
/* If zip 64 extension is enabled then read as 8 byte */
if (!zip64) {
err = mz_stream_read_uint32(stream, &value32);
value64 = value32;
} else {
err = mz_stream_read_int64(stream, &value64);
if (value64 < 0)
err = MZ_FORMAT_ERROR;
}
if (err == MZ_OK && compressed_size)
*compressed_size = value64;
}
if (err == MZ_OK) {
if (!zip64) {
err = mz_stream_read_uint32(stream, &value32);
value64 = value32;
} else {
err = mz_stream_read_int64(stream, &value64);
if (value64 < 0)
err = MZ_FORMAT_ERROR;
}
if (err == MZ_OK && uncompressed_size)
*uncompressed_size = value64;
}
return err;
}
static int32_t mz_zip_entry_write_crc_sizes(void *stream, uint8_t zip64, uint8_t mask, mz_zip_file *file_info) {
int32_t err = MZ_OK;
if (mask)
err = mz_stream_write_uint32(stream, 0);
else
err = mz_stream_write_uint32(stream, file_info->crc); /* crc */
/* For backwards-compatibility with older zip applications we set all sizes to UINT32_MAX
* when zip64 is needed, instead of only setting sizes larger than UINT32_MAX. */
if (err == MZ_OK) {
if (zip64) /* compr size */
err = mz_stream_write_uint32(stream, UINT32_MAX);
else
err = mz_stream_write_uint32(stream, (uint32_t)file_info->compressed_size);
}
if (err == MZ_OK) {
if (mask) /* uncompr size */
err = mz_stream_write_uint32(stream, 0);
else if (zip64)
err = mz_stream_write_uint32(stream, UINT32_MAX);
else
err = mz_stream_write_uint32(stream, (uint32_t)file_info->uncompressed_size);
}
return err;
}
static int32_t mz_zip_entry_needs_zip64(mz_zip_file *file_info, uint8_t local, uint8_t *zip64) {
uint32_t max_uncompressed_size = UINT32_MAX;
uint8_t needs_zip64 = 0;
if (!zip64)
return MZ_PARAM_ERROR;
*zip64 = 0;
if (local) {
/* At local header we might not know yet whether compressed size will overflow unsigned
32-bit integer which might happen for high entropy data so we give it some cushion */
max_uncompressed_size -= MZ_ZIP_UNCOMPR_SIZE64_CUSHION;
}
needs_zip64 = (file_info->uncompressed_size >= max_uncompressed_size) || (file_info->compressed_size >= UINT32_MAX);
if (!local) {
/* Disk offset and number only used in central directory header */
needs_zip64 |= (file_info->disk_offset >= UINT32_MAX) || (file_info->disk_number >= UINT16_MAX);
}
if (file_info->zip64 == MZ_ZIP64_AUTO) {
/* If uncompressed size is unknown, assume zip64 for 64-bit data descriptors */
if (local && file_info->uncompressed_size == 0) {
/* Don't use zip64 for local header directory entries */
if (mz_zip_attrib_is_dir(file_info->external_fa, file_info->version_madeby) != MZ_OK) {
*zip64 = 1;
}
}
*zip64 |= needs_zip64;
} else if (file_info->zip64 == MZ_ZIP64_FORCE) {
*zip64 = 1;
} else if (file_info->zip64 == MZ_ZIP64_DISABLE) {
/* Zip64 extension is required to zip file */
if (needs_zip64)
return MZ_PARAM_ERROR;
}
return MZ_OK;
}
static int32_t mz_zip_entry_write_header(void *stream, uint8_t local, mz_zip_file *file_info) {
uint64_t ntfs_time = 0;
uint32_t reserved = 0;
uint32_t dos_date = 0;
uint16_t extrafield_size = 0;
uint16_t field_type = 0;
uint16_t field_length = 0;
uint16_t field_length_zip64 = 0;
uint16_t field_length_ntfs = 0;
uint16_t field_length_aes = 0;
uint16_t field_length_unix1 = 0;
uint16_t filename_size = 0;
uint16_t filename_length = 0;
uint16_t linkname_size = 0;
uint16_t version_needed = 0;
int32_t comment_size = 0;
int32_t err = MZ_OK;
int32_t err_mem = MZ_OK;
uint8_t zip64 = 0;
uint8_t skip_aes = 0;
uint8_t mask = 0;
uint8_t write_end_slash = 0;
const char *filename = NULL;
char masked_name[64];
void *file_extra_stream = NULL;
if (!file_info)
return MZ_PARAM_ERROR;
if ((local) && (file_info->flag & MZ_ZIP_FLAG_MASK_LOCAL_INFO))
mask = 1;
/* Determine if zip64 extra field is necessary */
err = mz_zip_entry_needs_zip64(file_info, local, &zip64);
if (err != MZ_OK)
return err;
/* Start calculating extra field sizes */
if (zip64) {
/* Both compressed and uncompressed sizes must be included (at least in local header) */
field_length_zip64 = 8 + 8;
if ((!local) && (file_info->disk_offset >= UINT32_MAX))
field_length_zip64 += 8;
extrafield_size += 4;
extrafield_size += field_length_zip64;
}
/* Calculate extra field size and check for duplicates */
if (file_info->extrafield_size > 0) {
file_extra_stream = mz_stream_mem_create();
if (!file_extra_stream)
return MZ_MEM_ERROR;
mz_stream_mem_set_buffer(file_extra_stream, (void *)file_info->extrafield, file_info->extrafield_size);
do {
err_mem = mz_stream_read_uint16(file_extra_stream, &field_type);
if (err_mem == MZ_OK)
err_mem = mz_stream_read_uint16(file_extra_stream, &field_length);
if (err_mem != MZ_OK)
break;
/* Prefer incoming aes extensions over ours */
if (field_type == MZ_ZIP_EXTENSION_AES)
skip_aes = 1;
/* Prefer our zip64, ntfs, unix1 extension over incoming */
if (field_type != MZ_ZIP_EXTENSION_ZIP64 && field_type != MZ_ZIP_EXTENSION_NTFS &&
field_type != MZ_ZIP_EXTENSION_UNIX1)
extrafield_size += 4 + field_length;
if (err_mem == MZ_OK)
err_mem = mz_stream_seek(file_extra_stream, field_length, MZ_SEEK_CUR);
} while (err_mem == MZ_OK);
}
#ifdef HAVE_WZAES
if (!skip_aes) {
if ((file_info->flag & MZ_ZIP_FLAG_ENCRYPTED) && (file_info->aes_version)) {
field_length_aes = 1 + 1 + 1 + 2 + 2;
extrafield_size += 4 + field_length_aes;
}
}
#else
MZ_UNUSED(field_length_aes);
MZ_UNUSED(skip_aes);
#endif
/* NTFS timestamps */
if ((file_info->modified_date != 0) && (file_info->accessed_date != 0) && (file_info->creation_date != 0) &&
(!mask)) {
field_length_ntfs = 8 + 8 + 8 + 4 + 2 + 2;
extrafield_size += 4 + field_length_ntfs;
}
/* Unix1 symbolic links */
if (file_info->linkname && *file_info->linkname != 0) {
linkname_size = (uint16_t)strlen(file_info->linkname);
field_length_unix1 = 12 + linkname_size;
extrafield_size += 4 + field_length_unix1;
}
if (local)
err = mz_stream_write_uint32(stream, MZ_ZIP_MAGIC_LOCALHEADER);
else {
err = mz_stream_write_uint32(stream, MZ_ZIP_MAGIC_CENTRALHEADER);
if (err == MZ_OK)
err = mz_stream_write_uint16(stream, file_info->version_madeby);
}
/* Calculate version needed to extract */
if (err == MZ_OK) {
version_needed = file_info->version_needed;
if (version_needed == 0) {
version_needed = 20;
if (zip64)
version_needed = 45;
#ifdef HAVE_BZIP2
if (file_info->compression_method == MZ_COMPRESS_METHOD_BZIP2)
version_needed = 46;
#endif
#ifdef HAVE_WZAES
if ((file_info->flag & MZ_ZIP_FLAG_ENCRYPTED) && (file_info->aes_version))
version_needed = 51;
#endif
#if defined(HAVE_LZMA) || defined(HAVE_LIBCOMP)
if ((file_info->compression_method == MZ_COMPRESS_METHOD_LZMA) ||
(file_info->compression_method == MZ_COMPRESS_METHOD_XZ))
version_needed = 63;
#endif
}
err = mz_stream_write_uint16(stream, version_needed);
}
if (err == MZ_OK)
err = mz_stream_write_uint16(stream, file_info->flag);
if (err == MZ_OK) {
#ifdef HAVE_WZAES
if ((file_info->flag & MZ_ZIP_FLAG_ENCRYPTED) && (file_info->aes_version))
err = mz_stream_write_uint16(stream, MZ_COMPRESS_METHOD_AES);
else
#endif
err = mz_stream_write_uint16(stream, file_info->compression_method);
}
if (err == MZ_OK) {
if (file_info->modified_date != 0 && !mask)
dos_date = mz_zip_time_t_to_dos_date(file_info->modified_date);
err = mz_stream_write_uint32(stream, dos_date);
}
if (err == MZ_OK)
err = mz_zip_entry_write_crc_sizes(stream, zip64, mask, file_info);
if (mask) {
snprintf(masked_name, sizeof(masked_name), "%" PRIx32 "_%" PRIx64, file_info->disk_number,
file_info->disk_offset);
filename = masked_name;
} else {
filename = file_info->filename;
}
filename_length = (uint16_t)strlen(filename);
filename_size += filename_length;
if ((mz_zip_attrib_is_dir(file_info->external_fa, file_info->version_madeby) == MZ_OK) &&
((filename[filename_length - 1] != '/') && (filename[filename_length - 1] != '\\'))) {
filename_size += 1;
write_end_slash = 1;
}
if (err == MZ_OK)
err = mz_stream_write_uint16(stream, filename_size);
if (err == MZ_OK)
err = mz_stream_write_uint16(stream, extrafield_size);
if (!local) {
if (file_info->comment) {
comment_size = (int32_t)strlen(file_info->comment);
if (comment_size > UINT16_MAX)
comment_size = UINT16_MAX;
}
if (err == MZ_OK)
err = mz_stream_write_uint16(stream, (uint16_t)comment_size);
if (err == MZ_OK)
err = mz_stream_write_uint16(stream, (uint16_t)file_info->disk_number);
if (err == MZ_OK)
err = mz_stream_write_uint16(stream, file_info->internal_fa);
if (err == MZ_OK)
err = mz_stream_write_uint32(stream, file_info->external_fa);
if (err == MZ_OK) {
if (file_info->disk_offset >= UINT32_MAX)
err = mz_stream_write_uint32(stream, UINT32_MAX);
else
err = mz_stream_write_uint32(stream, (uint32_t)file_info->disk_offset);
}
}
if (err == MZ_OK) {
const char *next = filename;
int32_t left = filename_length;
#if defined(_WIN32)
const char *backslash = NULL;
/* Ensure all slashes are written as forward slashes according to 4.4.17.1 */
while ((err == MZ_OK) && (backslash = strchr(next, '\\'))) {
int32_t part_length = (int32_t)(backslash - next);
if (mz_stream_write(stream, next, part_length) != part_length || mz_stream_write(stream, "/", 1) != 1)
err = MZ_WRITE_ERROR;
left -= part_length + 1;
next = backslash + 1;
}
#endif
if (err == MZ_OK && left > 0) {
if (mz_stream_write(stream, next, left) != left)
err = MZ_WRITE_ERROR;
}
/* Ensure that directories have a slash appended to them for compatibility */
if (err == MZ_OK && write_end_slash)
err = mz_stream_write_uint8(stream, '/');
}
/* Write ZIP64 extra field first so we can update sizes later if data descriptor not used */
if ((err == MZ_OK) && (zip64)) {
err = mz_zip_extrafield_write(stream, MZ_ZIP_EXTENSION_ZIP64, field_length_zip64);
if (err == MZ_OK) {
if (mask)
err = mz_stream_write_int64(stream, 0);
else
err = mz_stream_write_int64(stream, file_info->uncompressed_size);
}
if (err == MZ_OK)
err = mz_stream_write_int64(stream, file_info->compressed_size);
if ((err == MZ_OK) && (!local) && (file_info->disk_offset >= UINT32_MAX))
err = mz_stream_write_int64(stream, file_info->disk_offset);
if ((err == MZ_OK) && (!local) && (file_info->disk_number >= UINT16_MAX))
err = mz_stream_write_uint32(stream, file_info->disk_number);
}
/* Write NTFS extra field */
if ((err == MZ_OK) && (field_length_ntfs > 0)) {
err = mz_zip_extrafield_write(stream, MZ_ZIP_EXTENSION_NTFS, field_length_ntfs);
if (err == MZ_OK)
err = mz_stream_write_uint32(stream, reserved);
if (err == MZ_OK)
err = mz_stream_write_uint16(stream, 0x01);
if (err == MZ_OK)
err = mz_stream_write_uint16(stream, field_length_ntfs - 8);
if (err == MZ_OK) {
mz_zip_unix_to_ntfs_time(file_info->modified_date, &ntfs_time);
err = mz_stream_write_uint64(stream, ntfs_time);
}
if (err == MZ_OK) {
mz_zip_unix_to_ntfs_time(file_info->accessed_date, &ntfs_time);
err = mz_stream_write_uint64(stream, ntfs_time);
}
if (err == MZ_OK) {
mz_zip_unix_to_ntfs_time(file_info->creation_date, &ntfs_time);
err = mz_stream_write_uint64(stream, ntfs_time);
}
}
/* Write UNIX extra block extra field */
if ((err == MZ_OK) && (field_length_unix1 > 0)) {
err = mz_zip_extrafield_write(stream, MZ_ZIP_EXTENSION_UNIX1, field_length_unix1);
if (err == MZ_OK)
err = mz_stream_write_uint32(stream, (uint32_t)file_info->accessed_date);
if (err == MZ_OK)
err = mz_stream_write_uint32(stream, (uint32_t)file_info->modified_date);
if (err == MZ_OK) /* User id */
err = mz_stream_write_uint16(stream, 0);
if (err == MZ_OK) /* Group id */
err = mz_stream_write_uint16(stream, 0);
if (err == MZ_OK && linkname_size > 0) {
if (mz_stream_write(stream, file_info->linkname, linkname_size) != linkname_size)
err = MZ_WRITE_ERROR;
}
}
#ifdef HAVE_WZAES
/* Write AES extra field */
if ((err == MZ_OK) && (!skip_aes) && (file_info->flag & MZ_ZIP_FLAG_ENCRYPTED) && (file_info->aes_version)) {
err = mz_zip_extrafield_write(stream, MZ_ZIP_EXTENSION_AES, field_length_aes);
if (err == MZ_OK)
err = mz_stream_write_uint16(stream, file_info->aes_version);
if (err == MZ_OK)
err = mz_stream_write_uint8(stream, 'A');
if (err == MZ_OK)
err = mz_stream_write_uint8(stream, 'E');
if (err == MZ_OK)
err = mz_stream_write_uint8(stream, file_info->aes_strength);
if (err == MZ_OK)
err = mz_stream_write_uint16(stream, file_info->compression_method);
}
#endif
if (file_info->extrafield_size > 0) {
err_mem = mz_stream_mem_seek(file_extra_stream, 0, MZ_SEEK_SET);
while (err == MZ_OK && err_mem == MZ_OK) {
err_mem = mz_stream_read_uint16(file_extra_stream, &field_type);
if (err_mem == MZ_OK)
err_mem = mz_stream_read_uint16(file_extra_stream, &field_length);
if (err_mem != MZ_OK)
break;
/* Prefer our zip 64, ntfs, unix1 extensions over incoming */
if (field_type == MZ_ZIP_EXTENSION_ZIP64 || field_type == MZ_ZIP_EXTENSION_NTFS ||
field_type == MZ_ZIP_EXTENSION_UNIX1) {
err_mem = mz_stream_seek(file_extra_stream, field_length, MZ_SEEK_CUR);
continue;
}
err = mz_stream_write_uint16(stream, field_type);
if (err == MZ_OK)
err = mz_stream_write_uint16(stream, field_length);
if (err == MZ_OK)
err = mz_stream_copy(stream, file_extra_stream, field_length);
}
mz_stream_mem_delete(&file_extra_stream);
}
if (err == MZ_OK && !local && file_info->comment) {
if (mz_stream_write(stream, file_info->comment, file_info->comment_size) != file_info->comment_size)
err = MZ_WRITE_ERROR;
}
return err;
}
static int32_t mz_zip_entry_write_descriptor(void *stream, uint8_t zip64, uint32_t crc32, int64_t compressed_size,
int64_t uncompressed_size) {
int32_t err = MZ_OK;
err = mz_stream_write_uint32(stream, MZ_ZIP_MAGIC_DATADESCRIPTOR);
if (err == MZ_OK)
err = mz_stream_write_uint32(stream, crc32);
/* Store data descriptor as 8 bytes if zip 64 extension enabled */
if (err == MZ_OK) {
/* Zip 64 extension is enabled when uncompressed size is > UINT32_MAX */
if (!zip64)
err = mz_stream_write_uint32(stream, (uint32_t)compressed_size);
else
err = mz_stream_write_int64(stream, compressed_size);
}
if (err == MZ_OK) {
if (!zip64)
err = mz_stream_write_uint32(stream, (uint32_t)uncompressed_size);
else
err = mz_stream_write_int64(stream, uncompressed_size);
}
return err;
}
static int32_t mz_zip_read_cd(void *handle) {
mz_zip *zip = (mz_zip *)handle;
uint64_t number_entry_cd64 = 0;
uint64_t number_entry_cd = 0;
int64_t eocd_pos = 0;
int64_t eocd_pos64 = 0;
int64_t value64i = 0;
uint16_t value16 = 0;
uint32_t value32 = 0;
uint64_t value64 = 0;
uint16_t comment_size = 0;
int32_t comment_read = 0;
int32_t err = MZ_OK;
if (!zip)
return MZ_PARAM_ERROR;
/* Read and cache central directory records */
err = mz_zip_search_eocd(zip->stream, &eocd_pos);
if (err == MZ_OK) {
/* The signature, already checked */
err = mz_stream_read_uint32(zip->stream, &value32);
/* Number of this disk */
if (err == MZ_OK)
err = mz_stream_read_uint16(zip->stream, &value16);
/* Number of the disk with the start of the central directory */
if (err == MZ_OK)
err = mz_stream_read_uint16(zip->stream, &value16);
zip->disk_number_with_cd = value16;
/* Total number of entries in the central dir on this disk */
if (err == MZ_OK)
err = mz_stream_read_uint16(zip->stream, &value16);
zip->number_entry = value16;
/* Total number of entries in the central dir */
if (err == MZ_OK)
err = mz_stream_read_uint16(zip->stream, &value16);
number_entry_cd = value16;
/* When recover is enabled, we can ignore incorrect number of entries */
if (number_entry_cd != zip->number_entry && !zip->recover)
err = MZ_FORMAT_ERROR;
/* Size of the central directory */
if (err == MZ_OK)
err = mz_stream_read_uint32(zip->stream, &value32);
if (err == MZ_OK)
zip->cd_size = value32;
/* Offset of start of central directory with respect to the starting disk number */
if (err == MZ_OK)
err = mz_stream_read_uint32(zip->stream, &value32);
if (err == MZ_OK)
zip->cd_offset = value32;
/* Zip file global comment length */
if (err == MZ_OK)
err = mz_stream_read_uint16(zip->stream, &comment_size);
if ((err == MZ_OK) && (comment_size > 0)) {
zip->comment = (char *)malloc(comment_size + 1);