/*
* Author:
* Guido Draheim <guidod@gmx.de>
*
* Copyright (c) 2000,2001,2002,2003 Guido Draheim
* All rights reserved
* use under the restrictions of the
* Lesser GNU General Public License
* or alternatively the restrictions
* of the Mozilla Public License 1.1
*
* The information was taken from appnote-981119-iz.zip
* at http://www.freesoftware.com/pub/infozip/doc/
* which in turn is based on PKWARE's appnote.txt
* (newer link: ftp://ftp.info-zip.org/pub/infozip/doc/)
*/
#ifndef _ZZIP_FORMAT_H /* zzipformat.h */
#define _ZZIP_FORMAT_H
#include <zzip/types.h>
#include <zzip/__hints.h>
/* we have ICO C 9X types defined */
/*
* Overall zipfile format
* [local file header + file data stream + checksum descriptor] ...
* ... [disk central directory] [disk trailer record]
*/
# ifdef _MSC_VER
# pragma pack(push, 1)
# endif
struct zzip_version
{
zzip_byte_t version[1];
zzip_byte_t ostype[1];
} ZZIP_GNUC_PACKED;
struct zzip_dostime
{
zzip_byte_t time[2];
zzip_byte_t date[2];
} ZZIP_GNUC_PACKED;
#ifdef ZZIP_NEED_PACKED
/* if your compiler does interesting things about struct packing... */
typedef zzip_byte_t zzip_version_t[2];
typedef zzip_byte_t zzip_dostime_t[4];
#else
typedef struct zzip_version zzip_version_t;
typedef struct zzip_dostime zzip_dostime_t;
#endif
#define ZZIP_CHECKMAGIC(__p,__A,__B,__C,__D) \
( (((zzip_byte_t*)(__p))[0]==(__A)) && \
(((zzip_byte_t*)(__p))[1]==(__B)) && \
(((zzip_byte_t*)(__p))[2]==(__C)) && \
(((zzip_byte_t*)(__p))[3]==(__D)) )
/* A. Local file header */
struct zzip_file_header
{
# define ZZIP_FILE_HEADER_MAGIC 0x04034b50
# define ZZIP_FILE_HEADER_CHECKMAGIC(__p) ZZIP_CHECKMAGIC(__p,'P','K','\3','\4')
zzip_byte_t z_magic[4]; /* local file header signature (0x04034b50) */
zzip_version_t z_extract; /* version needed to extract */
zzip_byte_t z_flags[2]; /* general purpose bit flag */
zzip_byte_t z_compr[2]; /* compression method */
zzip_dostime_t z_dostime; /* last mod file time (dos format) */
zzip_byte_t z_crc32[4]; /* crc-32 */
zzip_byte_t z_csize[4]; /* compressed size */
zzip_byte_t z_usize[4]; /* uncompressed size */
zzip_byte_t z_namlen[2]; /* filename length (null if stdin) */
zzip_byte_t z_extras[2]; /* extra field length */
/* followed by filename (of variable size) */
/* followed by extra field (of variable size) */
} ZZIP_GNUC_PACKED;
#define zzip_file_header_headerlength (4+2+2+2+4+4+4+4+2+2)
/* B. data descriptor
* the data descriptor exists only if bit 3 of z_flags is set. It is byte aligned
* and immediately follows the last byte of compressed data. It is only used if
* the output media of the compressor was not seekable, eg. standard output.
*/
struct zzip_file_trailer
{
# define ZZIP_FILE_TRAILER_MAGIC 0x08074B50
# define ZZIP_FILE_TRAILER_CHECKMAGIC(__p) ZZIP_CHECKMAGIC(__p,'P','K','\7','\8')
zzip_byte_t z_magic[4]; /* data descriptor signature (0x08074b50) */
zzip_byte_t z_crc32[4]; /* crc-32 */
zzip_byte_t z_csize[4]; /* compressed size */
zzip_byte_t z_usize[4]; /* uncompressed size */
} ZZIP_GNUC_PACKED;
#define zzip_file_trailer_headerlength (4+4+4+4)
/* C. central directory structure:
[file header] . . . end of central dir record
*/
/* directory file header
* - a single entry including filename, extras and comment may not exceed 64k.
*/
struct zzip_disk_entry
{
# define ZZIP_DISK_ENTRY_MAGIC 0x02014b50
# define ZZIP_DISK_ENTRY_CHECKMAGIC(__p) ZZIP_CHECKMAGIC(__p,'P','K','\1','\2')
zzip_byte_t z_magic[4]; /* central file header signature (0x02014b50) */
zzip_version_t z_encoder; /* version made by */
zzip_version_t z_extract; /* version need to extract */
zzip_byte_t z_flags[2]; /* general purpose bit flag */
zzip_byte_t z_compr[2]; /* compression method */
zzip_dostime_t z_dostime; /* last mod file time&date (dos format) */
zzip_byte_t z_crc32[4]; /* crc-32 */
zzip_byte_t z_csize[4]; /* compressed size */
zzip_byte_t z_usize[4]; /* uncompressed size */
zzip_byte_t z_namlen[2]; /* filename length (null if stdin) */
zzip_byte_t z_extras[2]; /* extra field length */
zzip_byte_t z_comment[2]; /* file comment length */
zzip_byte_t z_diskstart[2]; /* disk number of start (if spanning zip over multiple disks) */
zzip_byte_t z_filetype[2]; /* internal file attributes, bit0 = ascii */
zzip_byte_t z_filemode[4]; /* extrnal file attributes, eg. msdos attrib byte */
zzip_byte_t z_offset[4]; /* relative offset of local file header, seekval if singledisk */
/* followed by filename (of variable size) */
/* followed by extra field (of variable size) */
/* followed by file comment (of variable size) */
} ZZIP_GNUC_PACKED;
#define zzip_disk_entry_headerlength (4+2+2+2+2+4+4+4+4+2+2+2+2+2+4+4)
struct zzip_root_dirent
{ /* the old name of the structure above */
# define ZZIP_ROOT_DIRENT_MAGIC 0x02014b50
# define ZZIP_ROOT_DIRENT_CHECKMAGIC(__p) ZZIP_DISK_ENTRY_CHECKMAGIC(__p)
zzip_byte_t z_magic[4];
zzip_version_t z_encoder;
zzip_version_t z_extract;
zzip_byte_t z_flags[2];
zzip_byte_t z_compr[2];
zzip_dostime_t z_dostime;
zzip_byte_t z_crc32[4];
zzip_byte_t z_csize[4];
zzip_byte_t z_usize[4];
zzip_byte_t z_namlen[2];
zzip_byte_t z_extras[2];
zzip_byte_t z_comment[2];
zzip_byte_t z_diskstart[2];
zzip_byte_t z_filetype[2];
zzip_byte_t z_filemode[4];
zzip_byte_t z_off[4];
} ZZIP_GNUC_PACKED;
/* end of central dir record */
struct zzip_disk_trailer
{
# define ZZIP_DISK_TRAILER_MAGIC 0x06054b50
# define ZZIP_DISK_TRAILER_CHECKMAGIC(__p) ZZIP_CHECKMAGIC(__p,'P','K','\5','\6')
zzip_byte_t z_magic[4]; /* end of central dir signature (0x06054b50) */
zzip_byte_t z_disk[2]; /* number of this disk */
zzip_byte_t z_finaldisk[2]; /* number of the disk with the start of the central dir */
zzip_byte_t z_entries[2]; /* total number of entries in the central dir on this disk */
zzip_byte_t z_finalentries[2]; /* total number of entries in the central dir */
zzip_byte_t z_rootsize[4]; /* size of the central directory */
zzip_byte_t z_rootseek[4]; /* offset of start of central directory with respect to *
* the starting disk number */
zzip_byte_t z_comment[2]; /* zipfile comment length */
/* followed by zipfile comment (of variable size) */
} ZZIP_GNUC_PACKED;
#define zzip_disk_trailer_headerlength (4+2+2+2+2+4+4+2)
/* extra field should be type + size + data + type + size + data ... */
struct zzip_extra_block
{ /* fetch.h macros do not need this struct */
zzip_byte_t z_datatype[2]; /* as input type - a mere <char*> is okay */
zzip_byte_t z_datasize[2]; /* being returned by xx_to_extras usually */
} ZZIP_GNUC_PACKED;
#define zzip_extra_block_headerlength (2+2)
/* Zip64 end of central dir record */
struct zzip_disk64_trailer
{
# define ZZIP_DISK64_TRAILER_MAGIC 0x06064b50
# define ZZIP_DISK64_TRAILER_CHECKMAGIC(__p) ZZIP_CHECKMAGIC(__p,'P','K','\6','\6')
zzip_byte_t z_magic[4]; /* end of central dir signature (0x06054b50) */
zzip_byte_t z_size[8]; /* size of this central directory record */
zzip_version_t z_encoder; /* version made by */
zzip_version_t z_extract; /* version need to extract */
zzip_byte_t z_disk[4]; /* number of this disk */
zzip_byte_t z_finaldisk[4]; /* number of the disk with the start of the central dir */
zzip_byte_t z_entries[8]; /* total number of entries in the central dir on this disk */
zzip_byte_t z_finalentries[8]; /* total number of entries in the central dir */
zzip_byte_t z_rootsize[8]; /* size of the central directory */
zzip_byte_t z_rootseek[8]; /* offset of start of central directory with respect to *
* the starting disk number */
/* followed by zip64 extensible data sector (of variable size) */
} ZZIP_GNUC_PACKED;
#define zzip_disk64_trailer_headerlength (4+8+2+2+4+4+8+8+8+8)
/* z_flags */
#define ZZIP_IS_ENCRYPTED(p) ((*(zzip_byte_t*)p)&1)
#define ZZIP_IS_COMPRLEVEL(p) (((*(zzip_byte_t*)p)>>1)&3)
#define ZZIP_IS_STREAMED(p) (((*(zzip_byte_t*)p)>>3)&1)
#define ZZIP_IS_PATCHED(p) (((*(zzip_byte_t*)p)>>5)&1)
/* z_compr */
#define ZZIP_IS_STORED 0
#define ZZIP_IS_SHRUNK 1
#define ZZIP_IS_REDUCEDx1 2
#define ZZIP_IS_REDUCEDx2 3
#define ZZIP_IS_REDUCEDx3 4
#define ZZIP_IS_REDUCEDx4 5
#define ZZIP_IS_IMPLODED 6
#define ZZIP_IS_TOKENIZED 7
#define ZZIP_IS_DEFLATED 8
#define ZZIP_IS_DEFLATED_BETTER 9
#define ZZIP_IS_IMPLODED_BETTER 10
/* deflated comprlevel */
#define ZZIP_DEFLATED_STD_COMPR 0
#define ZZIP_DEFLATED_MAX_COMPR 1
#define ZZIP_DEFLATED_LOW_COMPR 2
#define ZZIP_DEFLATED_MIN_COMPR 3
# ifdef _MSC_VER
# pragma pack(pop)
# endif
#endif /* _ZZIPFORMAT_H */