/* * Author: * Guido Draheim * * Copyright (c) Guido Draheim, use under copyleft (LGPL,MPL) * * 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 #include /* 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 /* clang-format off */ #define ZZIP_GETMAGIC(__p) \ ( (((zzip_byte_t*)(__p))[0]<<24) | \ (((zzip_byte_t*)(__p))[1]<<16) | \ (((zzip_byte_t*)(__p))[2]<<8) | \ (((zzip_byte_t*)(__p))[3]) ) #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)) ) #define ZZIP_CHECKEXTRA(__p,__N) \ ( ZZIP_GETEXTRA(__p) == (__N)) #define ZZIP_GETEXTRA(__p) \ ( (((zzip_byte_t*)(__p))[1]<<8) | \ (((zzip_byte_t*)(__p))[0]) ) /* clang-format on */ /* 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 (4U + 2U + 2U + 2U + 4U + 4U + 4U + 4U + 2U + 2U) /* 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 (4U + 4U + 4U + 4U) /* 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 \ (4U + 2U + 2U + 2U + 2U + 4U + 4U + 4U + 4U + 2U + 2U + 2U + 2U + 2U + 4U + 4U) 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 (4U + 2U + 2U + 2U + 2U + 4U + 4U + 2U) /* 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 is okay */ zzip_byte_t z_datasize[2]; /* being returned by xx_to_extras usually */ } ZZIP_GNUC_PACKED; #define zzip_extra_block_headerlength (2U + 2U) /* Zip64 extras block */ struct zzip_extra_zip64 { #define ZZIP_EXTRA_ZIP64_MAGIC 0x0001 #define ZZIP_EXTRA_ZIP64_CHECK(__p) ZZIP_CHECKEXTRA(__p, ZZIP_EXTRA_ZIP64_MAGIC) zzip_byte_t z_datatype[2]; /* extras signature 0x0001 */ zzip_byte_t z_datasize[2]; /* structure length 0x0010 */ zzip_byte_t z_usize[8]; /* original size */ zzip_byte_t z_csize[8]; /* compressed size */ zzip_byte_t z_offset[8]; /* offset from file header */ zzip_byte_t z_diskstart[4]; /* disk where the file starts */ } ZZIP_GNUC_PACKED; /* Zip64 end of central dir locator */ struct zzip_disk64_locator { #define ZZIP_DISK64_LOCATOR_MAGIC 0x07064b50 #define ZZIP_DISK64_LOCATOR_CHECKMAGIC(__p) ZZIP_CHECKMAGIC(__p, 'P', 'K', '\6', '\7') zzip_byte_t z_magic[4]; /* end of central dir signature (0x06054b50) */ zzip_byte_t z_rootdisk[4]; /* number of disk with the zip64 directory */ zzip_byte_t z_rootseek[8]; /* relative offset of the zip64 directory */ zzip_byte_t z_numdisks[4]; /* total numer of disks */ /* followed by zip64 extensible data sector (of variable size) */ } ZZIP_GNUC_PACKED; /* 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 (4U + 8U + 2U + 2U + 4U + 4U + 8U + 8U + 8U + 8U) /* 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 */