/*
* Copyright (C) 2003 - 2006 Tomasz Kojm <tkojm@clamav.net>
* (C) 2006 Sensory Networks, Inc.
*
* The code of this module was based on zziplib 0.12.83:
* (c) 1999 - 2002 Guido Draheim <guidod@gmx.de>, published under
* the Lesser GNU General Public License
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301, USA.
*/
#ifndef __UNZIP_H
#define __UNZIP_H
#if HAVE_CONFIG_H
#include "clamav-config.h"
#endif
#include <stddef.h>
#include <stdio.h>
#include <sys/types.h>
#include "cltypes.h"
#ifndef HAVE_ATTRIB_PACKED
#define __attribute__(x)
#endif
#ifdef HAVE_PRAGMA_PACK
#pragma pack(1)
#endif
#ifdef HAVE_PRAGMA_PACK_HPPA
#pragma pack 1
#endif
/******** Zip format structures *********/
/* Local file header */
struct zip_file_header
{
# define ZIP_FILE_HEADER_MAGIC 0x04034b50
uint32_t z_magic; /* local file header signature */
uint16_t z_version; /* version needed to extract */
uint16_t z_flags; /* general purpose bit flag */
uint16_t z_compr; /* compression method */
uint16_t z_modtime; /* last mod file time */
uint16_t z_moddate; /* last mod file date */
uint32_t z_crc32; /* crc-32 */
uint32_t z_csize; /* compressed size */
uint32_t z_usize; /* uncompressed size */
uint16_t z_namlen; /* file name length */
uint16_t z_extras; /* extra field length */
/* followed by filename (of variable size) */
/* followed by extra field (of variable size) */
} __attribute__((packed));
/* Data descriptor (only if bit 3 of z_flags is set) */
struct zip_file_trailer
{
# define ZIP_FILE_TRAILER_MAGIC 0x08074B50
uint32_t z_magic; /* data descriptor signature (0x08074b50) */
uint32_t z_crc32; /* crc-32 */
uint32_t z_csize; /* compressed size */
uint32_t z_usize; /* uncompressed size */
} __attribute__((packed));
/* Central file header */
struct zip_root_dirent
{
# define ZIP_ROOT_DIRENT_MAGIC 0x02014b50
uint32_t z_magic; /* central file header signature */
uint16_t z_version1; /* version made by */
uint16_t z_version2; /* version needed to extract */
uint16_t z_flags; /* general purpose bit flag */
uint16_t z_compr; /* compression method */
uint16_t z_modtime; /* last mod file time */
uint16_t z_moddate; /* last mod file date */
uint32_t z_crc32; /* crc-32 */
uint32_t z_csize; /* compressed size */
uint32_t z_usize; /* uncompressed size */
uint16_t z_namlen; /* file name length */
uint16_t z_extras; /* extra field length */
uint16_t z_comment; /* file comment length */
uint16_t z_diskstart; /* disk number start */
uint16_t z_filetype; /* internal file attributes */
uint32_t z_filemode; /* extrnal file attributes */
uint32_t z_off; /* relative offset of local header */
/* followed by filename (of variable size) */
/* followed by extra field (of variable size) */
/* followed by file comment (of variable size) */
} __attribute__((packed));
/* End of central directory record */
struct zip_disk_trailer
{
# define ZIP_DISK_TRAILER_MAGIC 0x06054b50
uint32_t z_magic; /* end of central dir signature */
uint16_t z_disk; /* number of this disk */
uint16_t z_finaldisk; /* number of the disk with the start
* of the central dir
*/
uint16_t z_entries; /* total number of entries in the
* central dir on this disk
*/
uint16_t z_finalentries; /* total number of entries in the
* central dir
*/
uint32_t z_rootsize; /* size of the central directory */
uint32_t z_rootseek; /* offset of start of central directory
* with respect to the starting disk
* number
*/
uint16_t z_comment; /* zipfile comment length */
/* followed by zipfile comment (of variable size) */
} __attribute__((packed));
#define ZIP_METHOD_STORED 0
#define ZIP_METHOD_SHRUNK 1
#define ZIP_METHOD_REDUCEDx1 2
#define ZIP_METHOD_REDUCEDx2 3
#define ZIP_METHOD_REDUCEDx3 4
#define ZIP_METHOD_REDUCEDx4 5
#define ZIP_METHOD_IMPLODED 6
#define ZIP_METHOD_TOKENIZED 7
#define ZIP_METHOD_DEFLATED 8
#define ZIP_METHOD_DEFLATED64 9
#define ZIP_METHOD_IMPLODED_DCL 10
#define ZIP_METHOD_BZIP2 12
#define ZIP_METHOD_AES 99
/******** Internal structures *********/
struct __zip_file
{
struct __zip_dir *dir;
uint16_t method;
int16_t *bf;
size_t restlen;
size_t crestlen;
size_t usize;
size_t csize;
char *buf32k;
z_stream d_stream;
};
struct __zip_dir_hdr
{
uint32_t d_usize; /* uncompressed size */
uint32_t d_csize; /* compressed size */
uint32_t d_crc32; /* crc-32 */
uint32_t d_off; /* offset of file in zipfile */
uint16_t d_reclen; /* next dir_hdr structure offset */
uint16_t d_namlen; /* explicit namelen of d_name */
uint16_t d_compr; /* compression type */
int16_t d_bf[2]; /* compression type/brute force */
uint16_t d_flags; /* general purpose flags */
char d_name[1]; /* actual name of the entry */
};
struct __zip_dirent
{
uint16_t d_compr; /* compression method */
uint32_t d_csize; /* compressed size */
uint32_t st_size; /* file size / decompressed size */
uint16_t d_flags; /* general purpose flags */
char *d_name; /* file name / strdupped name */
uint32_t d_crc32; /* crc-32 */
uint32_t d_off; /* the offset in the file */
};
struct __zip_dir
{
int fd;
int errcode;
struct {
struct __zip_file *fp;
char *buf32k;
} cache;
struct __zip_dir_hdr *hdr0;
struct __zip_dir_hdr *hdr;
struct __zip_dirent dirent;
};
/* typedefs */
typedef struct __zip_dir zip_dir;
typedef struct __zip_dir_hdr zip_dir_hdr;
typedef struct __zip_file zip_file;
typedef struct __zip_dirent zip_dirent;
zip_dir *zip_dir_open(int fd, off_t start, int *errcode_p);
int zip_dir_read(zip_dir *dir, zip_dirent *d);
zip_file *zip_file_open(zip_dir *dir, const char *name, int d_off);
ssize_t zip_file_read(zip_file *fp, char *buf, size_t len);
int zip_file_close(zip_file *fp);
int zip_dir_close(zip_dir *dir);
#ifdef HAVE_PRAGMA_PACK
#pragma pack()
#endif
#ifdef HAVE_PRAGMA_PACK_HPPA
#pragma pack
#endif
#endif /* __UNZIP_H */