3 * Guido Draheim <guidod@gmx.de>
5 * Copyright (c) 2000,2001,2002,2003 Guido Draheim
7 * use under the restrictions of the
8 * Lesser GNU General Public License
9 * or alternatively the restrictions
10 * of the Mozilla Public License 1.1
12 * The information was taken from appnote-981119-iz.zip
13 * at http://www.freesoftware.com/pub/infozip/doc/
14 * which in turn is based on PKWARE's appnote.txt
15 * (newer link: ftp://ftp.info-zip.org/pub/infozip/doc/)
17 #ifndef _ZZIP_FORMAT_H /* zzipformat.h */
18 #define _ZZIP_FORMAT_H
21 /* we have ICO C 9X types defined */
24 * Overall zipfile format
25 * [local file header + file data stream + checksum descriptor] ...
26 * ... [disk central directory] [disk trailer record]
30 # pragma pack(push, 1)
37 } __zzip_attribute__((packed));
43 } __zzip_attribute__((packed));
45 #ifdef ZZIP_NEED_PACKED
46 /* if your compiler does interesting things about struct packing... */
47 typedef char zzip_version_t[2];
48 typedef char zzip_dostime_t[4];
50 typedef struct zzip_version zzip_version_t;
51 typedef struct zzip_dostime zzip_dostime_t;
54 #define ZZIP_CHECKMAGIC(__p,__A,__B,__C,__D) \
55 ( (((char*)(__p))[0]==(__A)) && \
56 (((char*)(__p))[1]==(__B)) && \
57 (((char*)(__p))[2]==(__C)) && \
58 (((char*)(__p))[3]==(__D)) )
60 /* A. Local file header */
61 struct zzip_file_header
63 # define ZZIP_FILE_HEADER_MAGIC 0x04034b50
64 # define ZZIP_FILE_HEADER_CHECKMAGIC(__p) ZZIP_CHECKMAGIC(__p,'P','K','\3','\4')
65 char z_magic[4]; /* local file header signature (0x04034b50) */
66 zzip_version_t z_extract; /* version needed to extract */
67 char z_flags[2]; /* general purpose bit flag */
68 char z_compr[2]; /* compression method */
69 zzip_dostime_t z_dostime; /* last mod file time (dos format) */
70 char z_crc32[4]; /* crc-32 */
71 char z_csize[4]; /* compressed size */
72 char z_usize[4]; /* uncompressed size */
73 char z_namlen[2]; /* filename length (null if stdin) */
74 char z_extras[2]; /* extra field length */
75 /* followed by filename (of variable size) */
76 /* followed by extra field (of variable size) */
77 } __zzip_attribute__((packed));
78 #define zzip_file_header_headerlength (4+2+2+2+4+4+4+4+2+2)
81 * the data descriptor exists only if bit 3 of z_flags is set. It is byte aligned
82 * and immediately follows the last byte of compressed data. It is only used if
83 * the output media of the compressor was not seekable, eg. standard output.
85 struct zzip_file_trailer
87 # define ZZIP_FILE_TRAILER_MAGIC 0x08074B50
88 # define ZZIP_FILE_TRAILER_CHECKMAGIC(__p) ZZIP_CHECKMAGIC(__p,'P','K','\7','\8')
89 char z_magic[4]; /* data descriptor signature (0x08074b50) */
90 char z_crc32[4]; /* crc-32 */
91 char z_csize[4]; /* compressed size */
92 char z_usize[4]; /* uncompressed size */
93 } __zzip_attribute__((packed));
94 #define zzip_file_trailer_headerlength (4+4+4+4)
96 /* C. central directory structure:
97 [file header] . . . end of central dir record
100 /* directory file header
101 * - a single entry including filename, extras and comment may not exceed 64k.
104 struct zzip_disk_entry
106 # define ZZIP_DISK_ENTRY_MAGIC 0x02014b50
107 # define ZZIP_DISK_ENTRY_CHECKMAGIC(__p) ZZIP_CHECKMAGIC(__p,'P','K','\1','\2')
108 char z_magic[4]; /* central file header signature (0x02014b50) */
109 zzip_version_t z_encoder; /* version made by */
110 zzip_version_t z_extract; /* version need to extract */
111 char z_flags[2]; /* general purpose bit flag */
112 char z_compr[2]; /* compression method */
113 zzip_dostime_t z_dostime; /* last mod file time&date (dos format) */
114 char z_crc32[4]; /* crc-32 */
115 char z_csize[4]; /* compressed size */
116 char z_usize[4]; /* uncompressed size */
117 char z_namlen[2]; /* filename length (null if stdin) */
118 char z_extras[2]; /* extra field length */
119 char z_comment[2]; /* file comment length */
120 char z_diskstart[2]; /* disk number of start (if spanning zip over multiple disks) */
121 char z_filetype[2]; /* internal file attributes, bit0 = ascii */
122 char z_filemode[4]; /* extrnal file attributes, eg. msdos attrib byte */
123 char z_offset[4]; /* relative offset of local file header, seekval if singledisk */
124 /* followed by filename (of variable size) */
125 /* followed by extra field (of variable size) */
126 /* followed by file comment (of variable size) */
127 } __zzip_attribute__((packed));
128 #define zzip_disk_entry_headerlength (4+2+2+2+2+4+4+4+4+2+2+2+2+2+4+4)
131 struct zzip_root_dirent
132 { /* the old name of the structure above */
133 # define ZZIP_ROOT_DIRENT_MAGIC 0x02014b50
134 # define ZZIP_ROOT_DIRENT_CHECKMAGIC(__p) ZZIP_DISK_ENTRY_CHECKMAGIC(__p)
136 zzip_version_t z_encoder; zzip_version_t z_extract;
137 char z_flags[2]; char z_compr[2]; zzip_dostime_t z_dostime;
138 char z_crc32[4]; char z_csize[4]; char z_usize[4];
139 char z_namlen[2]; char z_extras[2]; char z_comment[2];
140 char z_diskstart[2]; char z_filetype[2]; char z_filemode[4];
142 } __zzip_attribute__((packed));
145 /* end of central dir record */
146 struct zzip_disk_trailer
148 # define ZZIP_DISK_TRAILER_MAGIC 0x06054b50
149 # define ZZIP_DISK_TRAILER_CHECKMAGIC(__p) ZZIP_CHECKMAGIC(__p,'P','K','\5','\6')
150 char z_magic[4]; /* end of central dir signature (0x06054b50) */
151 char z_disk[2]; /* number of this disk */
152 char z_finaldisk[2]; /* number of the disk with the start of the central dir */
153 char z_entries[2]; /* total number of entries in the central dir on this disk */
154 char z_finalentries[2]; /* total number of entries in the central dir */
155 char z_rootsize[4]; /* size of the central directory */
156 char z_rootseek[4]; /* offset of start of central directory with respect to *
157 * the starting disk number */
158 char z_comment[2]; /* zipfile comment length */
159 /* followed by zipfile comment (of variable size) */
160 } __zzip_attribute__((packed));
161 #define zzip_disk_trailer_headerlength (4+2+2+2+2+4+4+2)
163 /* extra field should be type + size + data + type + size + data ... */
164 struct zzip_extra_block
165 { /* fetch.h macros do not need this struct */
166 char z_datatype[2]; /* as input type - a mere <char*> is okay */
167 char z_datasize[2]; /* being returned by xx_to_extras usually */
168 } __zzip_attribute__((packed));
169 #define zzip_extra_block_headerlength (2+2)
172 #define ZZIP_IS_ENCRYPTED(p) ((*(unsigned char*)p)&1)
173 #define ZZIP_IS_COMPRLEVEL(p) (((*(unsigned char*)p)>>1)&3)
174 #define ZZIP_IS_STREAMED(p) (((*(unsigned char*)p)>>3)&1)
175 #define ZZIP_IS_PATCHED(p) (((*(unsigned char*)p)>>5)&1)
178 #define ZZIP_IS_STORED 0
179 #define ZZIP_IS_SHRUNK 1
180 #define ZZIP_IS_REDUCEDx1 2
181 #define ZZIP_IS_REDUCEDx2 3
182 #define ZZIP_IS_REDUCEDx3 4
183 #define ZZIP_IS_REDUCEDx4 5
184 #define ZZIP_IS_IMPLODED 6
185 #define ZZIP_IS_TOKENIZED 7
186 #define ZZIP_IS_DEFLATED 8
187 #define ZZIP_IS_DEFLATED_BETTER 9
188 #define ZZIP_IS_IMPLODED_BETTER 10
190 /* deflated comprlevel */
191 #define ZZIP_DEFLATED_STD_COMPR 0
192 #define ZZIP_DEFLATED_MAX_COMPR 1
193 #define ZZIP_DEFLATED_LOW_COMPR 2
194 #define ZZIP_DEFLATED_MIN_COMPR 3
200 #endif /* _ZZIPFORMAT_H */