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1978 lines (1679 loc) · 70.6 KB
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/* unzip.c -- IO for uncompress .zip files using zlib
Version 1.2.0, September 16th, 2017
part of the MiniZip project
Copyright (C) 2010-2017 Nathan Moinvaziri
Modifications for AES, PKWARE disk spanning
https://github.com/nmoinvaz/minizip
Copyright (C) 2009-2010 Mathias Svensson
Modifications for Zip64 support on both zip and unzip
http://result42.com
Copyright (C) 2007-2008 Even Rouault
Modifications of Unzip for Zip64
Copyright (C) 1998-2010 Gilles Vollant
http://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 <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <errno.h>
#include "zlib.h"
#include "unzip.h"
#ifdef HAVE_AES
# define AES_METHOD (99)
# define AES_PWVERIFYSIZE (2)
# define AES_MAXSALTLENGTH (16)
# define AES_AUTHCODESIZE (10)
# define AES_HEADERSIZE (11)
# define AES_KEYSIZE(mode) (64 + (mode * 64))
# include "aes/aes.h"
# include "aes/fileenc.h"
#endif
#ifdef HAVE_APPLE_COMPRESSION
# include <compression.h>
#endif
#ifndef NOUNCRYPT
# include "crypt.h"
#endif
#define DISKHEADERMAGIC (0x08074b50)
#define LOCALHEADERMAGIC (0x04034b50)
#define CENTRALHEADERMAGIC (0x02014b50)
#define ENDHEADERMAGIC (0x06054b50)
#define ZIP64ENDHEADERMAGIC (0x06064b50)
#define ZIP64ENDLOCHEADERMAGIC (0x07064b50)
#define SIZECENTRALDIRITEM (0x2e)
#define SIZECENTRALHEADERLOCATOR (0x14)
#define SIZEZIPLOCALHEADER (0x1e)
#ifndef BUFREADCOMMENT
# define BUFREADCOMMENT (0x400)
#endif
#ifndef UNZ_BUFSIZE
# define UNZ_BUFSIZE (UINT16_MAX)
#endif
#ifndef UNZ_MAXFILENAMEINZIP
# define UNZ_MAXFILENAMEINZIP (256)
#endif
#ifndef ALLOC
# define ALLOC(size) (malloc(size))
#endif
#ifndef TRYFREE
# define TRYFREE(p) {if (p) free(p);}
#endif
const char unz_copyright[] = " unzip 1.2.0 Copyright 1998-2017 - https://github.com/nmoinvaz/minizip";
/* unz_file_info_internal contain internal info about a file in zipfile*/
typedef struct unz_file_info64_internal_s
{
uint64_t offset_curfile; /* relative offset of local header 8 bytes */
uint64_t byte_before_the_zipfile; /* byte before the zipfile, (>0 for sfx) */
#ifdef HAVE_AES
uint8_t aes_encryption_mode;
uint16_t aes_compression_method;
uint16_t aes_version;
#endif
} unz_file_info64_internal;
/* file_in_zip_read_info_s contain internal information about a file in zipfile */
typedef struct
{
uint8_t *read_buffer; /* internal buffer for compressed data */
z_stream stream; /* zLib stream structure for inflate */
#ifdef HAVE_BZIP2
bz_stream bstream; /* bzLib stream structure for bziped */
#endif
#ifdef HAVE_APPLE_COMPRESSION
compression_stream astream; /* libcompression stream structure */
#endif
#ifdef HAVE_AES
fcrypt_ctx aes_ctx;
#endif
uint64_t pos_in_zipfile; /* position in byte on the zipfile, for fseek */
uint8_t stream_initialised; /* flag set if stream structure is initialised */
uint64_t offset_local_extrafield; /* offset of the local extra field */
uint16_t size_local_extrafield; /* size of the local extra field */
uint64_t pos_local_extrafield; /* position in the local extra field in read */
uint64_t total_out_64;
uint32_t crc32; /* crc32 of all data uncompressed */
uint32_t crc32_expected; /* crc32 we must obtain after decompress all */
uint64_t rest_read_compressed; /* number of byte to be decompressed */
uint64_t rest_read_uncompressed; /* number of byte to be obtained after decomp */
zlib_filefunc64_32_def z_filefunc;
voidpf filestream; /* io structore of the zipfile */
uint16_t compression_method; /* compression method (0==store) */
uint64_t byte_before_the_zipfile; /* byte before the zipfile, (>0 for sfx) */
int raw;
} file_in_zip64_read_info_s;
/* unz64_s contain internal information about the zipfile */
typedef struct
{
zlib_filefunc64_32_def z_filefunc;
voidpf filestream; /* io structure of the current zipfile */
voidpf filestream_with_CD; /* io structure of the disk with the central directory */
unz_global_info64 gi; /* public global information */
uint64_t byte_before_the_zipfile; /* byte before the zipfile, (>0 for sfx) */
uint64_t num_file; /* number of the current file in the zipfile */
uint64_t pos_in_central_dir; /* pos of the current file in the central dir */
uint64_t current_file_ok; /* flag about the usability of the current file */
uint64_t central_pos; /* position of the beginning of the central dir */
uint32_t number_disk; /* number of the current disk, used for spanning ZIP */
uint64_t size_central_dir; /* size of the central directory */
uint64_t offset_central_dir; /* offset of start of central directory with
respect to the starting disk number */
unz_file_info64 cur_file_info; /* public info about the current file in zip*/
unz_file_info64_internal cur_file_info_internal;
/* private info about it*/
file_in_zip64_read_info_s *pfile_in_zip_read;
/* structure about the current file if we are decompressing it */
int is_zip64; /* is the current file zip64 */
#ifndef NOUNCRYPT
uint32_t keys[3]; /* keys defining the pseudo-random sequence */
const z_crc_t *pcrc_32_tab;
#endif
} unz64_internal;
/* Read a byte from a gz_stream; Return EOF for end of file. */
static int unzReadUInt8(const zlib_filefunc64_32_def *pzlib_filefunc_def, voidpf filestream, uint8_t *value)
{
uint8_t c = 0;
if (ZREAD64(*pzlib_filefunc_def, filestream, &c, 1) == 1)
{
*value = (uint8_t)c;
return UNZ_OK;
}
*value = 0;
if (ZERROR64(*pzlib_filefunc_def, filestream))
return UNZ_ERRNO;
return UNZ_EOF;
}
static int unzReadUInt16(const zlib_filefunc64_32_def *pzlib_filefunc_def, voidpf filestream, uint16_t *value)
{
uint16_t x;
uint8_t c = 0;
int err = UNZ_OK;
err = unzReadUInt8(pzlib_filefunc_def, filestream, &c);
x = (uint16_t)c;
if (err == UNZ_OK)
err = unzReadUInt8(pzlib_filefunc_def, filestream, &c);
x |= ((uint16_t)c) << 8;
if (err == UNZ_OK)
*value = x;
else
*value = 0;
return err;
}
static int unzReadUInt32(const zlib_filefunc64_32_def *pzlib_filefunc_def, voidpf filestream, uint32_t *value)
{
uint32_t x = 0;
uint8_t c = 0;
int err = UNZ_OK;
err = unzReadUInt8(pzlib_filefunc_def, filestream, &c);
x = (uint32_t)c;
if (err == UNZ_OK)
err = unzReadUInt8(pzlib_filefunc_def, filestream, &c);
x |= ((uint32_t)c) << 8;
if (err == UNZ_OK)
err = unzReadUInt8(pzlib_filefunc_def, filestream, &c);
x |= ((uint32_t)c) << 16;
if (err == UNZ_OK)
err = unzReadUInt8(pzlib_filefunc_def, filestream, &c);
x += ((uint32_t)c) << 24;
if (err == UNZ_OK)
*value = x;
else
*value = 0;
return err;
}
static int unzReadUInt64(const zlib_filefunc64_32_def *pzlib_filefunc_def, voidpf filestream, uint64_t *value)
{
uint64_t x = 0;
uint8_t i = 0;
int err = UNZ_OK;
err = unzReadUInt8(pzlib_filefunc_def, filestream, &i);
x = (uint64_t)i;
if (err == UNZ_OK)
err = unzReadUInt8(pzlib_filefunc_def, filestream, &i);
x |= ((uint64_t)i) << 8;
if (err == UNZ_OK)
err = unzReadUInt8(pzlib_filefunc_def, filestream, &i);
x |= ((uint64_t)i) << 16;
if (err == UNZ_OK)
err = unzReadUInt8(pzlib_filefunc_def, filestream, &i);
x |= ((uint64_t)i) << 24;
if (err == UNZ_OK)
err = unzReadUInt8(pzlib_filefunc_def, filestream, &i);
x |= ((uint64_t)i) << 32;
if (err == UNZ_OK)
err = unzReadUInt8(pzlib_filefunc_def, filestream, &i);
x |= ((uint64_t)i) << 40;
if (err == UNZ_OK)
err = unzReadUInt8(pzlib_filefunc_def, filestream, &i);
x |= ((uint64_t)i) << 48;
if (err == UNZ_OK)
err = unzReadUInt8(pzlib_filefunc_def, filestream, &i);
x |= ((uint64_t)i) << 56;
if (err == UNZ_OK)
*value = x;
else
*value = 0;
return err;
}
/* Locate the Central directory of a zip file (at the end, just before the global comment) */
static int unzSearchCentralDir(const zlib_filefunc64_32_def *pzlib_filefunc_def, uint64_t *pos_found, voidpf filestream)
{
uint8_t buf[BUFREADCOMMENT + 4];
uint64_t file_size = 0;
uint64_t back_read = 4;
uint64_t max_back = UINT16_MAX; /* maximum size of global comment */
uint32_t read_size = 0;
uint64_t read_pos = 0;
uint32_t i = 0;
*pos_found = 0;
if (ZSEEK64(*pzlib_filefunc_def, filestream, 0, ZLIB_FILEFUNC_SEEK_END) != 0)
return UNZ_ERRNO;
file_size = ZTELL64(*pzlib_filefunc_def, filestream);
if (max_back > file_size)
max_back = file_size;
while (back_read < max_back)
{
if (back_read + BUFREADCOMMENT > max_back)
back_read = max_back;
else
back_read += BUFREADCOMMENT;
read_pos = file_size - back_read;
read_size = ((BUFREADCOMMENT + 4) < (file_size - read_pos)) ?
(BUFREADCOMMENT + 4) : (uint32_t)(file_size - read_pos);
if (ZSEEK64(*pzlib_filefunc_def, filestream, read_pos, ZLIB_FILEFUNC_SEEK_SET) != 0)
break;
if (ZREAD64(*pzlib_filefunc_def, filestream, buf, read_size) != read_size)
break;
for (i = read_size - 3; (i--) > 0;)
if (((*(buf+i)) == (ENDHEADERMAGIC & 0xff)) &&
((*(buf+i+1)) == (ENDHEADERMAGIC >> 8 & 0xff)) &&
((*(buf+i+2)) == (ENDHEADERMAGIC >> 16 & 0xff)) &&
((*(buf+i+3)) == (ENDHEADERMAGIC >> 24 & 0xff)))
{
*pos_found = read_pos+i;
return UNZ_OK;
}
}
return UNZ_ERRNO;
}
/* Locate the Central directory 64 of a zipfile (at the end, just before the global comment) */
static int unzSearchCentralDir64(const zlib_filefunc64_32_def *pzlib_filefunc_def, uint64_t *offset, voidpf filestream,
const uint64_t endcentraloffset)
{
uint32_t value32 = 0;
*offset = 0;
/* Zip64 end of central directory locator */
if (ZSEEK64(*pzlib_filefunc_def, filestream, endcentraloffset - SIZECENTRALHEADERLOCATOR, ZLIB_FILEFUNC_SEEK_SET) != 0)
return UNZ_ERRNO;
/* Read locator signature */
if (unzReadUInt32(pzlib_filefunc_def, filestream, &value32) != UNZ_OK)
return UNZ_ERRNO;
if (value32 != ZIP64ENDLOCHEADERMAGIC)
return UNZ_ERRNO;
/* Number of the disk with the start of the zip64 end of central directory */
if (unzReadUInt32(pzlib_filefunc_def, filestream, &value32) != UNZ_OK)
return UNZ_ERRNO;
/* Relative offset of the zip64 end of central directory record */
if (unzReadUInt64(pzlib_filefunc_def, filestream, offset) != UNZ_OK)
return UNZ_ERRNO;
/* Total number of disks */
if (unzReadUInt32(pzlib_filefunc_def, filestream, &value32) != UNZ_OK)
return UNZ_ERRNO;
/* Goto end of central directory record */
if (ZSEEK64(*pzlib_filefunc_def, filestream, *offset, ZLIB_FILEFUNC_SEEK_SET) != 0)
return UNZ_ERRNO;
/* The signature */
if (unzReadUInt32(pzlib_filefunc_def, filestream, &value32) != UNZ_OK)
return UNZ_ERRNO;
if (value32 != ZIP64ENDHEADERMAGIC)
return UNZ_ERRNO;
return UNZ_OK;
}
static unzFile unzOpenInternal(const void *path, zlib_filefunc64_32_def *pzlib_filefunc64_32_def)
{
unz64_internal us;
unz64_internal *s = NULL;
uint64_t central_pos = 0;
uint64_t central_pos64 = 0;
uint64_t number_entry_CD = 0;
uint16_t value16 = 0;
uint32_t value32 = 0;
uint64_t value64 = 0;
voidpf filestream = NULL;
int err = UNZ_OK;
us.filestream = NULL;
us.filestream_with_CD = NULL;
us.z_filefunc.zseek32_file = NULL;
us.z_filefunc.ztell32_file = NULL;
if (pzlib_filefunc64_32_def == NULL)
fill_fopen64_filefunc(&us.z_filefunc.zfile_func64);
else
us.z_filefunc = *pzlib_filefunc64_32_def;
us.filestream = ZOPEN64(us.z_filefunc, path, ZLIB_FILEFUNC_MODE_READ | ZLIB_FILEFUNC_MODE_EXISTING);
if (us.filestream == NULL)
return NULL;
us.filestream_with_CD = us.filestream;
us.is_zip64 = 0;
/* Search for end of central directory header */
err = unzSearchCentralDir(&us.z_filefunc, ¢ral_pos, us.filestream);
if (err == UNZ_OK)
{
if (ZSEEK64(us.z_filefunc, us.filestream, central_pos, ZLIB_FILEFUNC_SEEK_SET) != 0)
err = UNZ_ERRNO;
/* The signature, already checked */
if (unzReadUInt32(&us.z_filefunc, us.filestream, &value32) != UNZ_OK)
err = UNZ_ERRNO;
/* Number of this disk */
if (unzReadUInt16(&us.z_filefunc, us.filestream, &value16) != UNZ_OK)
err = UNZ_ERRNO;
us.number_disk = value16;
/* Number of the disk with the start of the central directory */
if (unzReadUInt16(&us.z_filefunc, us.filestream, &value16) != UNZ_OK)
err = UNZ_ERRNO;
us.gi.number_disk_with_CD = value16;
/* Total number of entries in the central directory on this disk */
if (unzReadUInt16(&us.z_filefunc, us.filestream, &value16) != UNZ_OK)
err = UNZ_ERRNO;
us.gi.number_entry = value16;
/* Total number of entries in the central directory */
if (unzReadUInt16(&us.z_filefunc, us.filestream, &value16) != UNZ_OK)
err = UNZ_ERRNO;
number_entry_CD = value16;
if (number_entry_CD != us.gi.number_entry)
err = UNZ_BADZIPFILE;
/* Size of the central directory */
if (unzReadUInt32(&us.z_filefunc, us.filestream, &value32) != UNZ_OK)
err = UNZ_ERRNO;
us.size_central_dir = value32;
/* Offset of start of central directory with respect to the starting disk number */
if (unzReadUInt32(&us.z_filefunc, us.filestream, &value32) != UNZ_OK)
err = UNZ_ERRNO;
us.offset_central_dir = value32;
/* Zipfile comment length */
if (unzReadUInt16(&us.z_filefunc, us.filestream, &us.gi.size_comment) != UNZ_OK)
err = UNZ_ERRNO;
if (err == UNZ_OK)
{
/* Search for Zip64 end of central directory header */
int err64 = unzSearchCentralDir64(&us.z_filefunc, ¢ral_pos64, us.filestream, central_pos);
if (err64 == UNZ_OK)
{
central_pos = central_pos64;
us.is_zip64 = 1;
if (ZSEEK64(us.z_filefunc, us.filestream, central_pos, ZLIB_FILEFUNC_SEEK_SET) != 0)
err = UNZ_ERRNO;
/* the signature, already checked */
if (unzReadUInt32(&us.z_filefunc, us.filestream, &value32) != UNZ_OK)
err = UNZ_ERRNO;
/* size of zip64 end of central directory record */
if (unzReadUInt64(&us.z_filefunc, us.filestream, &value64) != UNZ_OK)
err = UNZ_ERRNO;
/* version made by */
if (unzReadUInt16(&us.z_filefunc, us.filestream, &value16) != UNZ_OK)
err = UNZ_ERRNO;
/* version needed to extract */
if (unzReadUInt16(&us.z_filefunc, us.filestream, &value16) != UNZ_OK)
err = UNZ_ERRNO;
/* number of this disk */
if (unzReadUInt32(&us.z_filefunc, us.filestream, &us.number_disk) != UNZ_OK)
err = UNZ_ERRNO;
/* number of the disk with the start of the central directory */
if (unzReadUInt32(&us.z_filefunc, us.filestream, &us.gi.number_disk_with_CD) != UNZ_OK)
err = UNZ_ERRNO;
/* total number of entries in the central directory on this disk */
if (unzReadUInt64(&us.z_filefunc, us.filestream, &us.gi.number_entry) != UNZ_OK)
err = UNZ_ERRNO;
/* total number of entries in the central directory */
if (unzReadUInt64(&us.z_filefunc, us.filestream, &number_entry_CD) != UNZ_OK)
err = UNZ_ERRNO;
if (number_entry_CD != us.gi.number_entry)
err = UNZ_BADZIPFILE;
/* size of the central directory */
if (unzReadUInt64(&us.z_filefunc, us.filestream, &us.size_central_dir) != UNZ_OK)
err = UNZ_ERRNO;
/* offset of start of central directory with respect to the starting disk number */
if (unzReadUInt64(&us.z_filefunc, us.filestream, &us.offset_central_dir) != UNZ_OK)
err = UNZ_ERRNO;
}
else if ((us.gi.number_entry == UINT16_MAX) || (us.size_central_dir == UINT16_MAX) || (us.offset_central_dir == UINT32_MAX))
err = UNZ_BADZIPFILE;
}
}
else
err = UNZ_ERRNO;
if ((err == UNZ_OK) && (central_pos < us.offset_central_dir + us.size_central_dir))
err = UNZ_BADZIPFILE;
if (err != UNZ_OK)
{
ZCLOSE64(us.z_filefunc, us.filestream);
return NULL;
}
if (us.gi.number_disk_with_CD == 0)
{
/* If there is only one disk open another stream so we don't have to seek between the CD
and the file headers constantly */
filestream = ZOPEN64(us.z_filefunc, path, ZLIB_FILEFUNC_MODE_READ | ZLIB_FILEFUNC_MODE_EXISTING);
if (filestream != NULL)
us.filestream = filestream;
}
/* Hack for zip files that have no respect for zip64
if ((central_pos > 0xffffffff) && (us.offset_central_dir < 0xffffffff))
us.offset_central_dir = central_pos - us.size_central_dir;*/
us.byte_before_the_zipfile = central_pos - (us.offset_central_dir + us.size_central_dir);
us.central_pos = central_pos;
us.pfile_in_zip_read = NULL;
s = (unz64_internal*)ALLOC(sizeof(unz64_internal));
if (s != NULL)
{
*s = us;
unzGoToFirstFile((unzFile)s);
}
return (unzFile)s;
}
extern unzFile ZEXPORT unzOpen2(const char *path, zlib_filefunc_def *pzlib_filefunc32_def)
{
if (pzlib_filefunc32_def != NULL)
{
zlib_filefunc64_32_def zlib_filefunc64_32_def_fill;
fill_zlib_filefunc64_32_def_from_filefunc32(&zlib_filefunc64_32_def_fill, pzlib_filefunc32_def);
return unzOpenInternal(path, &zlib_filefunc64_32_def_fill);
}
return unzOpenInternal(path, NULL);
}
extern unzFile ZEXPORT unzOpen2_64(const void *path, zlib_filefunc64_def *pzlib_filefunc_def)
{
if (pzlib_filefunc_def != NULL)
{
zlib_filefunc64_32_def zlib_filefunc64_32_def_fill;
zlib_filefunc64_32_def_fill.zfile_func64 = *pzlib_filefunc_def;
zlib_filefunc64_32_def_fill.ztell32_file = NULL;
zlib_filefunc64_32_def_fill.zseek32_file = NULL;
return unzOpenInternal(path, &zlib_filefunc64_32_def_fill);
}
return unzOpenInternal(path, NULL);
}
extern unzFile ZEXPORT unzOpen(const char *path)
{
return unzOpenInternal(path, NULL);
}
extern unzFile ZEXPORT unzOpen64(const void *path)
{
return unzOpenInternal(path, NULL);
}
extern int ZEXPORT unzClose(unzFile file)
{
unz64_internal *s;
if (file == NULL)
return UNZ_PARAMERROR;
s = (unz64_internal*)file;
if (s->pfile_in_zip_read != NULL)
unzCloseCurrentFile(file);
if ((s->filestream != NULL) && (s->filestream != s->filestream_with_CD))
ZCLOSE64(s->z_filefunc, s->filestream);
if (s->filestream_with_CD != NULL)
ZCLOSE64(s->z_filefunc, s->filestream_with_CD);
s->filestream = NULL;
s->filestream_with_CD = NULL;
TRYFREE(s);
return UNZ_OK;
}
/* Goto to the next available disk for spanned archives */
static int unzGoToNextDisk(unzFile file)
{
unz64_internal *s;
uint32_t number_disk_next = 0;
s = (unz64_internal*)file;
if (s == NULL)
return UNZ_PARAMERROR;
number_disk_next = s->number_disk;
if ((s->pfile_in_zip_read != NULL) && (s->pfile_in_zip_read->rest_read_uncompressed > 0))
/* We are currently reading a file and we need the next sequential disk */
number_disk_next += 1;
else
/* Goto the disk for the current file */
number_disk_next = s->cur_file_info.disk_num_start;
if (number_disk_next != s->number_disk)
{
/* Switch disks */
if ((s->filestream != NULL) && (s->filestream != s->filestream_with_CD))
ZCLOSE64(s->z_filefunc, s->filestream);
if (number_disk_next == s->gi.number_disk_with_CD)
{
s->filestream = s->filestream_with_CD;
}
else
{
s->filestream = ZOPENDISK64(s->z_filefunc, s->filestream_with_CD, number_disk_next,
ZLIB_FILEFUNC_MODE_READ | ZLIB_FILEFUNC_MODE_EXISTING);
}
if (s->filestream == NULL)
return UNZ_ERRNO;
s->number_disk = number_disk_next;
}
return UNZ_OK;
}
extern int ZEXPORT unzGetGlobalInfo(unzFile file, unz_global_info* pglobal_info32)
{
unz64_internal *s = NULL;
if (file == NULL)
return UNZ_PARAMERROR;
s = (unz64_internal*)file;
pglobal_info32->number_entry = (uint32_t)s->gi.number_entry;
pglobal_info32->size_comment = s->gi.size_comment;
pglobal_info32->number_disk_with_CD = s->gi.number_disk_with_CD;
return UNZ_OK;
}
extern int ZEXPORT unzGetGlobalInfo64(unzFile file, unz_global_info64 *pglobal_info)
{
unz64_internal *s = NULL;
if (file == NULL)
return UNZ_PARAMERROR;
s = (unz64_internal*)file;
*pglobal_info = s->gi;
return UNZ_OK;
}
extern int ZEXPORT unzGetGlobalComment(unzFile file, char *comment, uint16_t comment_size)
{
unz64_internal *s = NULL;
uint16_t bytes_to_read = comment_size;
if (file == NULL)
return (int)UNZ_PARAMERROR;
s = (unz64_internal*)file;
if (bytes_to_read > s->gi.size_comment)
bytes_to_read = s->gi.size_comment;
if (ZSEEK64(s->z_filefunc, s->filestream_with_CD, s->central_pos + 22, ZLIB_FILEFUNC_SEEK_SET) != 0)
return UNZ_ERRNO;
if (bytes_to_read > 0)
{
*comment = 0;
if (ZREAD64(s->z_filefunc, s->filestream_with_CD, comment, bytes_to_read) != bytes_to_read)
return UNZ_ERRNO;
}
if ((comment != NULL) && (comment_size > s->gi.size_comment))
*(comment + s->gi.size_comment) = 0;
return (int)bytes_to_read;
}
static int unzGetCurrentFileInfoField(unzFile file, uint32_t *seek, void *field, uint16_t field_size, uint16_t size_file_field, int null_terminated_field)
{
unz64_internal *s = NULL;
uint32_t bytes_to_read = 0;
int err = UNZ_OK;
if (file == NULL)
return (int)UNZ_PARAMERROR;
s = (unz64_internal*)file;
/* Read field */
if (field != NULL)
{
if (size_file_field < field_size)
{
if (null_terminated_field)
*((char *)field+size_file_field) = 0;
bytes_to_read = size_file_field;
}
else
bytes_to_read = field_size;
if (*seek != 0)
{
if (ZSEEK64(s->z_filefunc, s->filestream_with_CD, *seek, ZLIB_FILEFUNC_SEEK_CUR) == 0)
*seek = 0;
else
err = UNZ_ERRNO;
}
if ((size_file_field > 0) && (field_size > 0))
{
if (ZREAD64(s->z_filefunc, s->filestream_with_CD, field, bytes_to_read) != bytes_to_read)
err = UNZ_ERRNO;
}
*seek += size_file_field - bytes_to_read;
}
else
{
*seek += size_file_field;
}
return err;
}
/* Get info about the current file in the zipfile, with internal only info */
static int unzGetCurrentFileInfoInternal(unzFile file, unz_file_info64 *pfile_info,
unz_file_info64_internal *pfile_info_internal, char *filename, uint16_t filename_size, void *extrafield,
uint16_t extrafield_size, char *comment, uint16_t comment_size)
{
unz64_internal *s = NULL;
unz_file_info64 file_info;
unz_file_info64_internal file_info_internal;
uint32_t magic = 0;
uint64_t current_pos = 0;
uint32_t seek = 0;
uint32_t extra_pos = 0;
uint16_t extra_header_id = 0;
uint16_t extra_data_size = 0;
uint16_t value16 = 0;
uint32_t value32 = 0;
uint64_t value64 = 0;
int err = UNZ_OK;
if (file == NULL)
return UNZ_PARAMERROR;
s = (unz64_internal*)file;
if (ZSEEK64(s->z_filefunc, s->filestream_with_CD,
s->pos_in_central_dir + s->byte_before_the_zipfile, ZLIB_FILEFUNC_SEEK_SET) != 0)
err = UNZ_ERRNO;
/* Check the magic */
if (err == UNZ_OK)
{
if (unzReadUInt32(&s->z_filefunc, s->filestream_with_CD, &magic) != UNZ_OK)
err = UNZ_ERRNO;
else if (magic != CENTRALHEADERMAGIC)
err = UNZ_BADZIPFILE;
}
/* Read central directory header */
if (unzReadUInt16(&s->z_filefunc, s->filestream_with_CD, &file_info.version) != UNZ_OK)
err = UNZ_ERRNO;
if (unzReadUInt16(&s->z_filefunc, s->filestream_with_CD, &file_info.version_needed) != UNZ_OK)
err = UNZ_ERRNO;
if (unzReadUInt16(&s->z_filefunc, s->filestream_with_CD, &file_info.flag) != UNZ_OK)
err = UNZ_ERRNO;
if (unzReadUInt16(&s->z_filefunc, s->filestream_with_CD, &file_info.compression_method) != UNZ_OK)
err = UNZ_ERRNO;
if (unzReadUInt32(&s->z_filefunc, s->filestream_with_CD, &file_info.dos_date) != UNZ_OK)
err = UNZ_ERRNO;
if (unzReadUInt32(&s->z_filefunc, s->filestream_with_CD, &file_info.crc) != UNZ_OK)
err = UNZ_ERRNO;
if (unzReadUInt32(&s->z_filefunc, s->filestream_with_CD, &value32) != UNZ_OK)
err = UNZ_ERRNO;
file_info.compressed_size = value32;
if (unzReadUInt32(&s->z_filefunc, s->filestream_with_CD, &value32) != UNZ_OK)
err = UNZ_ERRNO;
file_info.uncompressed_size = value32;
if (unzReadUInt16(&s->z_filefunc, s->filestream_with_CD, &file_info.size_filename) != UNZ_OK)
err = UNZ_ERRNO;
if (unzReadUInt16(&s->z_filefunc, s->filestream_with_CD, &file_info.size_file_extra) != UNZ_OK)
err = UNZ_ERRNO;
if (unzReadUInt16(&s->z_filefunc, s->filestream_with_CD, &file_info.size_file_comment) != UNZ_OK)
err = UNZ_ERRNO;
if (unzReadUInt16(&s->z_filefunc, s->filestream_with_CD, &value16) != UNZ_OK)
err = UNZ_ERRNO;
file_info.disk_num_start = value16;
if (unzReadUInt16(&s->z_filefunc, s->filestream_with_CD, &file_info.internal_fa) != UNZ_OK)
err = UNZ_ERRNO;
if (unzReadUInt32(&s->z_filefunc, s->filestream_with_CD, &file_info.external_fa) != UNZ_OK)
err = UNZ_ERRNO;
/* Relative offset of local header */
if (unzReadUInt32(&s->z_filefunc, s->filestream_with_CD, &value32) != UNZ_OK)
err = UNZ_ERRNO;
file_info.size_file_extra_internal = 0;
file_info.disk_offset = value32;
file_info_internal.offset_curfile = value32;
#ifdef HAVE_AES
file_info_internal.aes_compression_method = 0;
file_info_internal.aes_encryption_mode = 0;
file_info_internal.aes_version = 0;
#endif
if (err == UNZ_OK)
err = unzGetCurrentFileInfoField(file, &seek, filename, filename_size, file_info.size_filename, 1);
/* Read extrafield */
if (err == UNZ_OK)
err = unzGetCurrentFileInfoField(file, &seek, extrafield, extrafield_size, file_info.size_file_extra, 0);
if ((err == UNZ_OK) && (file_info.size_file_extra != 0))
{
if (seek != 0)
{
if (ZSEEK64(s->z_filefunc, s->filestream_with_CD, seek, ZLIB_FILEFUNC_SEEK_CUR) == 0)
seek = 0;
else
err = UNZ_ERRNO;
}
/* We are going to parse the extra field so we need to move back */
current_pos = ZTELL64(s->z_filefunc, s->filestream_with_CD);
if (current_pos < file_info.size_file_extra)
err = UNZ_ERRNO;
current_pos -= file_info.size_file_extra;
if (ZSEEK64(s->z_filefunc, s->filestream_with_CD, current_pos, ZLIB_FILEFUNC_SEEK_SET) != 0)
err = UNZ_ERRNO;
while ((err != UNZ_ERRNO) && (extra_pos < file_info.size_file_extra))
{
if (unzReadUInt16(&s->z_filefunc, s->filestream_with_CD, &extra_header_id) != UNZ_OK)
err = UNZ_ERRNO;
if (unzReadUInt16(&s->z_filefunc, s->filestream_with_CD, &extra_data_size) != UNZ_OK)
err = UNZ_ERRNO;
/* ZIP64 extra fields */
if (extra_header_id == 0x0001)
{
/* Subtract size of ZIP64 field, since ZIP64 is handled internally */
file_info.size_file_extra_internal += 2 + 2 + extra_data_size;
if (file_info.uncompressed_size == UINT32_MAX)
{
if (unzReadUInt64(&s->z_filefunc, s->filestream_with_CD, &file_info.uncompressed_size) != UNZ_OK)
err = UNZ_ERRNO;
}
if (file_info.compressed_size == UINT32_MAX)
{
if (unzReadUInt64(&s->z_filefunc, s->filestream_with_CD, &file_info.compressed_size) != UNZ_OK)
err = UNZ_ERRNO;
}
if (file_info_internal.offset_curfile == UINT32_MAX)
{
/* Relative Header offset */
if (unzReadUInt64(&s->z_filefunc, s->filestream_with_CD, &value64) != UNZ_OK)
err = UNZ_ERRNO;
file_info_internal.offset_curfile = value64;
file_info.disk_offset = value64;
}
if (file_info.disk_num_start == UINT32_MAX)
{
/* Disk Start Number */
if (unzReadUInt32(&s->z_filefunc, s->filestream_with_CD, &file_info.disk_num_start) != UNZ_OK)
err = UNZ_ERRNO;
}
}
#ifdef HAVE_AES
/* AES header */
else if (extra_header_id == 0x9901)
{
uint8_t value8 = 0;
/* Subtract size of AE
D10B
S field, since AES is handled internally */
file_info.size_file_extra_internal += 2 + 2 + extra_data_size;
/* Verify version info */
if (unzReadUInt16(&s->z_filefunc, s->filestream_with_CD, &value16) != UNZ_OK)
err = UNZ_ERRNO;
/* Support AE-1 and AE-2 */
if (value16 != 1 && value16 != 2)
err = UNZ_ERRNO;
file_info_internal.aes_version = value16;
if (unzReadUInt8(&s->z_filefunc, s->filestream_with_CD, &value8) != UNZ_OK)
err = UNZ_ERRNO;
if ((char)value8 != 'A')
err = UNZ_ERRNO;
if (unzReadUInt8(&s->z_filefunc, s->filestream_with_CD, &value8) != UNZ_OK)
err = UNZ_ERRNO;
if ((char)value8 != 'E')
err = UNZ_ERRNO;
/* Get AES encryption strength and actual compression method */
if (unzReadUInt8(&s->z_filefunc, s->filestream_with_CD, &value8) != UNZ_OK)
err = UNZ_ERRNO;
file_info_internal.aes_encryption_mode = value8;
if (unzReadUInt16(&s->z_filefunc, s->filestream_with_CD, &value16) != UNZ_OK)
err = UNZ_ERRNO;
file_info_internal.aes_compression_method = value16;
}
#endif
else
{
if (ZSEEK64(s->z_filefunc, s->filestream_with_CD,extra_data_size, ZLIB_FILEFUNC_SEEK_CUR) != 0)
err = UNZ_ERRNO;
}
extra_pos += 2 + 2 + extra_data_size;
}
}
if (file_info.disk_num_start == s->gi.number_disk_with_CD)
file_info_internal.byte_before_the_zipfile = s->byte_before_the_zipfile;
else
file_info_internal.byte_before_the_zipfile = 0;
if (err == UNZ_OK)
err = unzGetCurrentFileInfoField(file, &seek, comment, comment_size, file_info.size_file_comment, 1);
if ((err == UNZ_OK) && (pfile_info != NULL))
*pfile_info = file_info;
if ((err == UNZ_OK) && (pfile_info_internal != NULL))
*pfile_info_internal = file_info_internal;
return err;
}
extern int ZEXPORT unzGetCurrentFileInfo(unzFile file, unz_file_info *pfile_info, char *filename,
uint16_t filename_size, void *extrafield, uint16_t extrafield_size, char *comment, uint16_t comment_size)
{
unz_file_info64 file_info64;
int err = UNZ_OK;
err = unzGetCurrentFileInfoInternal(file, &file_info64, NULL, filename, filename_size,
extrafield, extrafield_size, comment, comment_size);
if ((err == UNZ_OK) && (pfile_info != NULL))
{
pfile_info->version = file_info64.version;
pfile_info->version_needed = file_info64.version_needed;
pfile_info->flag = file_info64.flag;
pfile_info->compression_method = file_info64.compression_method;
pfile_info->dos_date = file_info64.dos_date;
pfile_info->crc = file_info64.crc;
pfile_info->size_filename = file_info64.size_filename;
pfile_info->size_file_extra = file_info64.size_file_extra - file_info64.size_file_extra_internal;
pfile_info->size_file_comment = file_info64.size_file_comment;
pfile_info->disk_num_start = (uint16_t)file_info64.disk_num_start;
pfile_info->internal_fa = file_info64.internal_fa;
pfile_info->external_fa = file_info64.external_fa;
pfile_info->compressed_size = (uint32_t)file_info64.compressed_size;
pfile_info->uncompressed_size = (uint32_t)file_info64.uncompressed_size;
}
return err;
}
extern int ZEXPORT unzGetCurrentFileInfo64(unzFile file, unz_file_info64 * pfile_info, char *filename,
uint16_t filename_size, void *extrafield, uint16_t extrafield_size, char *comment, uint16_t comment_size)
{
return unzGetCurrentFileInfoInternal(file, pfile_info, NULL, filename, filename_size,
extrafield, extrafield_size, comment,comment_size);
}
/* Read the local header of the current zipfile. Check the coherency of the local header and info in the
end of central directory about this file store in *piSizeVar the size of extra info in local header
(filename and size of extra field data) */
static int unzCheckCurrentFileCoherencyHeader(unz64_internal *s, uint32_t *psize_variable, uint64_t *poffset_local_extrafield,
uint16_t *psize_local_extrafield)
{
uint32_t magic = 0;
uint16_t value16 = 0;
uint32_t value32 = 0;
uint32_t flags = 0;
uint16_t size_filename = 0;
uint16_t size_extra_field = 0;
uint16_t compression_method = 0;
int err = UNZ_OK;
if (psize_variable == NULL)
return UNZ_PARAMERROR;
*psize_variable = 0;
if (poffset_local_extrafield == NULL)
return UNZ_PARAMERROR;
*poffset_local_extrafield = 0;
if (psize_local_extrafield == NULL)
return UNZ_PARAMERROR;
*psize_local_extrafield = 0;
err = unzGoToNextDisk((unzFile)s);
if (err != UNZ_OK)
return err;
if (ZSEEK64(s->z_filefunc, s->filestream, s->cur_file_info_internal.offset_curfile +
s->cur_file_info_internal.byte_before_the_zipfile, ZLIB_FILEFUNC_SEEK_SET) != 0)
return UNZ_ERRNO;
if (err == UNZ_OK)
{
if (unzReadUInt32(&s->z_filefunc, s->filestream, &magic) != UNZ_OK)
err = UNZ_ERRNO;
else if (magic != LOCALHEADERMAGIC)
err = UNZ_BADZIPFILE;
}
if (unzReadUInt16(&s->z_filefunc, s->filestream, &value16) != UNZ_OK)
err = UNZ_ERRNO;
if (unzReadUInt16(&s->z_filefunc, s->filestream, &value16) != UNZ_OK)
err = UNZ_ERRNO;
flags = value16;
if (unzReadUInt16(&s->z_filefunc, s->filestream, &value16) != UNZ_OK)
err = UNZ_ERRNO;
else if ((err == UNZ_OK) && (value16 != s->cur_file_info.compression_method))
err = UNZ_BADZIPFILE;
compression_method = s->cur_file_info.compression_method;
#ifdef HAVE_AES
if (compression_method == AES_METHOD)
compression_method = s->cur_file_info_internal.aes_compression_method;
#endif
if ((err == UNZ_OK) && (compression_method != 0) && (compression_method != Z_DEFLATED))
{
#ifdef HAVE_BZIP2
if (compression_method != Z_BZIP2ED)
#endif
err = UNZ_BADZIPFILE;
}
if (unzReadUInt32(&s->z_filefunc, s->filestream, &value32) != UNZ_OK) /* date/time */