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* Guido Draheim <guidod@gmx.de>
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* Copyright (c) 2000,2001 Guido Draheim
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* use under the restrictions of the
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* Lesser GNU General Public License
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* The information was taken from appnote-981119-iz.zip
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* at http://www.freesoftware.com/pub/infozip/doc/
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* which in turn is based on PKWARE's appnote.txt
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#ifndef _ZZIP_FORMAT_H /* zzipformat.h */
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#define _ZZIP_FORMAT_H
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/* we have ICO C 9X types defined */
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* Overall zipfile format
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* [local file header + file data + data descriptr] ... [central directory] [EOD record]
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# pragma pack(push, 1)
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} __attribute__((packed));
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} __attribute__((packed));
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#define ZZIP_CHECKMAGIC(__p,__A,__B,__C,__D) \
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( (((char*)(__p))[0]==(__A)) && \
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(((char*)(__p))[1]==(__B)) && \
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(((char*)(__p))[2]==(__C)) && \
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(((char*)(__p))[3]==(__D)) )
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/* A. Local file header */
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struct zzip_file_header
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# define ZZIP_FILE_HEADER_MAGIC 0x04034b50
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# define ZZIP_FILE_HEADER_CHECKMAGIC(__p) ZZIP_CHECKMAGIC(__p,'P','K','\3','\4')
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char z_magic[4]; /* local file header signature (0x04034b50) */
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struct zzip_version z_extract; /* version needed to extract */
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char z_flags[2]; /* general purpose bit flag */
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char z_compr[2]; /* compression method */
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struct zzip_dostime z_dostime; /* last mod file time (dos format) */
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char z_crc32[4]; /* crc-32 */
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char z_csize[4]; /* compressed size */
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char z_usize[4]; /* uncompressed size */
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char z_namlen[2]; /* filename length (null if stdin) */
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char z_extras[2]; /* extra field length */
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/* followed by filename (of variable size) */
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/* followed by extra field (of variable size) */
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} __attribute__((packed));
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* the data descriptor exists only if bit 3 of z_flags is set. It is byte aligned
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* and immediately follows the last byte of compressed data. It is only used if
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* the output media of the compressor was not seekable, eg. standard output.
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struct zzip_file_trailer
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# define ZZIP_FILE_TRAILER_MAGIC 0x08074B50
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# define ZZIP_FILE_TRAILER_CHECKMAGIC(__p) ZZIP_CHECKMAGIC(__p,'P','K','\7','\8')
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uint32_t z_magic; /* data descriptor signature (0x08074b50) */
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uint32_t z_crc32; /* crc-32 */
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uint32_t z_csize; /* compressed size */
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uint32_t z_usize; /* uncompressed size */
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} __attribute__((packed));
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/* C. central directory structure:
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[file header] . . . end of central dir record
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/* directory file header
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* - a single entry including filename, extras and comment may not exceed 64k.
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struct zzip_root_dirent
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# define ZZIP_ROOT_DIRENT_MAGIC 0x02014b50
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# define ZZIP_ROOT_DIRENT_CHECKMAGIC(__p) ZZIP_CHECKMAGIC(__p,'P','K','\1','\2')
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char z_magic[4]; /* central file header signature (0x02014b50) */
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struct zzip_version z_encoder; /* version made by */
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struct zzip_version z_extract; /* version need to extract */
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char z_flags[2]; /* general purpose bit flag */
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char z_compr[2]; /* compression method */
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struct zzip_dostime z_dostime; /* last mod file time&date (dos format) */
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char z_crc32[4]; /* crc-32 */
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char z_csize[4]; /* compressed size */
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char z_usize[4]; /* uncompressed size */
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char z_namlen[2]; /* filename length (null if stdin) */
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char z_extras[2]; /* extra field length */
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char z_comment[2]; /* file comment length */
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char z_diskstart[2]; /* disk number of start (if spanning zip over multiple disks) */
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char z_filetype[2]; /* internal file attributes, bit0 = ascii */
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char z_filemode[4]; /* extrnal file attributes, eg. msdos attrib byte */
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char z_off[4]; /* relative offset of local file header, seekval if singledisk */
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/* followed by filename (of variable size) */
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/* followed by extra field (of variable size) */
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/* followed by file comment (of variable size) */
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} __attribute__((packed));
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/* end of central dir record */
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struct zzip_disk_trailer
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# define ZZIP_DISK_TRAILER_MAGIC 0x06054b50
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# define ZZIP_DISK_TRAILER_CHECKMAGIC(__p) ZZIP_CHECKMAGIC(__p,'P','K','\5','\6')
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char z_magic[4]; /* end of central dir signature (0x06054b50) */
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char z_disk[2]; /* number of this disk */
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char z_finaldisk[2]; /* number of the disk with the start of the central dir */
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char z_entries[2]; /* total number of entries in the central dir on this disk */
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char z_finalentries[2]; /* total number of entries in the central dir */
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char z_rootsize[4]; /* size of the central directory */
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char z_rootseek[4]; /* offset of start of central directory with respect to *
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* the starting disk number */
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char z_comment[2]; /* zipfile comment length */
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/* followed by zipfile comment (of variable size) */
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} __attribute__((packed));
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#define ZZIP_IS_ENCRYPTED(p) ((*(unsigned char*)p)&1)
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#define ZZIP_IS_COMPRLEVEL(p) (((*(unsigned char*)p)>>1)&3)
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#define ZZIP_IS_STREAMED(p) (((*(unsigned char*)p)>>3)&1)
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#define ZZIP_IS_STORED 0
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#define ZZIP_IS_SHRUNK 1
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#define ZZIP_IS_REDUCEDx1 2
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#define ZZIP_IS_REDUCEDx2 3
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#define ZZIP_IS_REDUCEDx3 4
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#define ZZIP_IS_REDUCEDx4 5
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#define ZZIP_IS_IMPLODED 6
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#define ZZIP_IS_TOKENIZED 7
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#define ZZIP_IS_DEFLATED 8
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#define ZZIP_IS_DEFLATED_BETTER 9
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#define ZZIP_IS_IMPLODED_BETTER 10
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#endif /* _ZZIPFORMAT_H */
added
removed
zzip/format.h
