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/*
* Author:
* Guido Draheim <guidod@gmx.de>
*
* Copyright (c) 2000,2001 Guido Draheim
* All rights reserved
* use under the restrictions of the
* Lesser GNU General Public License
*
* 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
*/
#ifndef _ZZIP_FORMAT_H /* zzipformat.h */
#define _ZZIP_FORMAT_H
#include <zzip.h>
/* we have ICO C 9X types defined */
/*
* Overall zipfile format
* [local file header + file data + data descriptr] ... [central directory] [EOD record]
*/
# ifdef _MSC_VER
# pragma pack(push, 1)
# endif
struct zzip_version
{
char version[1];
char ostype[1];
} __attribute__((packed));
struct zzip_dostime
{
char time[2];
char date[2];
} __attribute__((packed));
#define ZZIP_CHECKMAGIC(__p,__A,__B,__C,__D) \
( (((char*)(__p))[0]==(__A)) && \
(((char*)(__p))[1]==(__B)) && \
(((char*)(__p))[2]==(__C)) && \
(((char*)(__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')
char z_magic[4]; /* local file header signature (0x04034b50) */
struct zzip_version z_extract; /* version needed to extract */
char z_flags[2]; /* general purpose bit flag */
char z_compr[2]; /* compression method */
struct zzip_dostime z_dostime; /* last mod file time (dos format) */
char z_crc32[4]; /* crc-32 */
char z_csize[4]; /* compressed size */
char z_usize[4]; /* uncompressed size */
char z_namlen[2]; /* filename length (null if stdin) */
char z_extras[2]; /* extra field length */
/* followed by filename (of variable size) */
/* followed by extra field (of variable size) */
} __attribute__((packed));
/* 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') |
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} __attribute__((packed));
/* 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_root_dirent
{
# define ZZIP_ROOT_DIRENT_MAGIC 0x02014b50
# define ZZIP_ROOT_DIRENT_CHECKMAGIC(__p) ZZIP_CHECKMAGIC(__p,'P','K','\1','\2')
char z_magic[4]; /* central file header signature (0x02014b50) */
struct zzip_version z_encoder; /* version made by */
struct zzip_version z_extract; /* version need to extract */
char z_flags[2]; /* general purpose bit flag */
char z_compr[2]; /* compression method */
struct zzip_dostime z_dostime; /* last mod file time&date (dos format) */
char z_crc32[4]; /* crc-32 */
char z_csize[4]; /* compressed size */
char z_usize[4]; /* uncompressed size */
char z_namlen[2]; /* filename length (null if stdin) */
char z_extras[2]; /* extra field length */
char z_comment[2]; /* file comment length */
char z_diskstart[2]; /* disk number of start (if spanning zip over multiple disks) */
char z_filetype[2]; /* internal file attributes, bit0 = ascii */
char z_filemode[4]; /* extrnal file attributes, eg. msdos attrib byte */
char z_off[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) */
} __attribute__((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')
char z_magic[4]; /* end of central dir signature (0x06054b50) */
char z_disk[2]; /* number of this disk */
char z_finaldisk[2]; /* number of the disk with the start of the central dir */
char z_entries[2]; /* total number of entries in the central dir on this disk */
char z_finalentries[2]; /* total number of entries in the central dir */
char z_rootsize[4]; /* size of the central directory */
char z_rootseek[4]; /* offset of start of central directory with respect to *
* the starting disk number */
char z_comment[2]; /* zipfile comment length */
/* followed by zipfile comment (of variable size) */
} __attribute__((packed));
/* z_flags */
#define ZZIP_IS_ENCRYPTED(p) ((*(unsigned char*)p)&1)
#define ZZIP_IS_COMPRLEVEL(p) (((*(unsigned char*)p)>>1)&3)
#define ZZIP_IS_STREAMED(p) (((*(unsigned char*)p)>>3)&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
# ifdef _MSC_VER
# pragma pack(pop)
# endif
#endif /* _ZZIPFORMAT_H */
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