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unzip.c
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/* unzip.c -- IO for uncompress .zip files using zlib
Version 1.1, February 14h, 2010
part of the MiniZip project
Copyright (C) 1998-2010 Gilles Vollant
http://www.winimage.com/zLibDll/minizip.html
Modifications of Unzip for Zip64
Copyright (C) 2007-2008 Even Rouault
Modifications for Zip64 support on both zip and unzip
Copyright (C) 2009-2010 Mathias Svensson
http://result42.com
Modifications for AES, PKWARE disk spanning
Copyright (C) 2010-2014 Nathan Moinvaziri
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.
Mar 8th, 2016 - Lucio Cosmo
Fixed support for 64bit builds for archives with "PKWARE" password.
Changed long, unsigned long, unsigned to unsigned int in
access functions to crctables and pkeys
*/
#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
#ifndef local
# define local static
#endif
/* compile with -Dlocal if your debugger can't find static symbols */
#define DISKHEADERMAGIC (0x08074b50)
#define LOCALHEADERMAGIC (0x04034b50)
#define CENTRALHEADERMAGIC (0x02014b50)
#define ENDHEADERMAGIC (0x06054b50)
#define ZIP64ENDHEADERMAGIC (0x06064b50)
#define ZIP64ENDLOCHEADERMAGIC (0x07064b50)
#define SIZECENTRALDIRITEM (0x2e)
#define SIZECENTRALHEADERLOCATOR (0x14) /* 20 */
#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 1.01 Copyright 1998-2004 Gilles Vollant - http://www.winimage.com/zLibDll";
/* unz_file_info_interntal 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_wait; /* 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 uint32_t *pcrc_32_tab;
#endif
} unz64_s;
/* Read a byte from a gz_stream; Return EOF for end of file. */
local 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;
}
local 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;
}
local 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;
}
local 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) */
local uint64_t unzSearchCentralDir(const zlib_filefunc64_32_def *pzlib_filefunc_def, voidpf filestream)
{
unsigned char *buf = NULL;
uint64_t file_size = 0;
uint64_t back_read = 4;
uint64_t max_back = UINT16_MAX; /* maximum size of global comment */
uint64_t pos_found = 0;
uint32_t read_size = 0;
uint64_t read_pos = 0;
uint32_t i = 0;
buf = (unsigned char*)ALLOC(BUFREADCOMMENT + 4);
if (buf == NULL)
return 0;
if (ZSEEK64(*pzlib_filefunc_def, filestream, 0, ZLIB_FILEFUNC_SEEK_END) != 0)
{
TRYFREE(buf);
return 0;
}
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;
break;
}
if (pos_found != 0)
break;
}
TRYFREE(buf);
return pos_found;
}
/* Locate the Central directory 64 of a zipfile (at the end, just before the global comment) */
local uint64_t unzSearchCentralDir64(const zlib_filefunc64_32_def *pzlib_filefunc_def, voidpf filestream,
const uint64_t endcentraloffset)
{
uint64_t offset = 0;
uint32_t value32 = 0;
/* Zip64 end of central directory locator */
if (ZSEEK64(*pzlib_filefunc_def, filestream, endcentraloffset - SIZECENTRALHEADERLOCATOR, ZLIB_FILEFUNC_SEEK_SET) != 0)
return 0;
/* Read locator signature */
if (unzReadUInt32(pzlib_filefunc_def, filestream, &value32) != UNZ_OK)
return 0;
if (value32 != ZIP64ENDLOCHEADERMAGIC)
return 0;
/* Number of the disk with the start of the zip64 end of central directory */
if (unzReadUInt32(pzlib_filefunc_def, filestream, &value32) != UNZ_OK)
return 0;
/* Relative offset of the zip64 end of central directory record */
if (unzReadUInt64(pzlib_filefunc_def, filestream, &offset) != UNZ_OK)
return 0;
/* Total number of disks */
if (unzReadUInt32(pzlib_filefunc_def, filestream, &value32) != UNZ_OK)
return 0;
/* Goto end of central directory record */
if (ZSEEK64(*pzlib_filefunc_def, filestream, offset, ZLIB_FILEFUNC_SEEK_SET) != 0)
return 0;
/* The signature */
if (unzReadUInt32(pzlib_filefunc_def, filestream, &value32) != UNZ_OK)
return 0;
if (value32 != ZIP64ENDHEADERMAGIC)
return 0;
return offset;
}
local unzFile unzOpenInternal(const void *path, zlib_filefunc64_32_def *pzlib_filefunc64_32_def)
{
unz64_s us;
unz64_s *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;
if (unz_copyright[0] != ' ')
return NULL;
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 */
central_pos = unzSearchCentralDir(&us.z_filefunc, us.filestream);
if (central_pos)
{
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 */
central_pos64 = unzSearchCentralDir64(&us.z_filefunc, us.filestream, central_pos);
if (central_pos64)
{
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_s*)ALLOC(sizeof(unz64_s));
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_s *s;
if (file == NULL)
return UNZ_PARAMERROR;
s = (unz64_s*)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 */
local int unzGoToNextDisk(unzFile file)
{
unz64_s *s;
uint32_t number_disk_next = 0;
s = (unz64_s*)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_s *s = NULL;
if (file == NULL)
return UNZ_PARAMERROR;
s = (unz64_s*)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_s *s = NULL;
if (file == NULL)
return UNZ_PARAMERROR;
s = (unz64_s*)file;
*pglobal_info = s->gi;
return UNZ_OK;
}
extern int ZEXPORT unzGetGlobalComment(unzFile file, char *comment, uint16_t comment_size)
{
unz64_s *s = NULL;
uint16_t bytes_to_read = comment_size;
if (file == NULL)
return (int)UNZ_PARAMERROR;
s = (unz64_s*)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;
}
local int unzGetCurrentFileInfoField(unzFile file, uint32_t *seek, void *field, uint16_t field_size, uint16_t size_file_field, int null_terminated_field)
{
unz64_s *s = NULL;
uint32_t bytes_to_read = 0;
int err = UNZ_OK;
if (file == NULL)
return (int)UNZ_PARAMERROR;
s = (unz64_s*)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 */
local 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_s *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_s*)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 AES 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) */
local int unzCheckCurrentFileCoherencyHeader(unz64_s *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)