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format.h
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/* * 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 */ #ifndef _ZZIP_FORMAT_H /* zzipformat.h */ #define _ZZIP_FORMAT_H #include <zzip/lib.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') 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)); /* 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 */