GZIP Archive
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Contents
GZIP, GZ
- Format Type : Archive
- Endian Order : Little Endian
- Signature : 1F 8B
Format Specifications
//header
2 bytes (uint16) - signature // 1F 8B (35615)
1 byte (uint8) - compression method // 1-7 - reserved
// 8 - deflate
1 byte (uint8) - flags // bit 0 FTEXT - file is ASCII text
// bit 1 FHCRC - CRC16 for the gzip header is present
// bit 2 FEXTRA - optional extra fields are present
// bit 3 FNAME - an original file name is present
// bit 4 FCOMMENT - a zero-terminated file comment is present
// bit 5 reserved
// bit 6 reserved
// bit 7 reserved
4 bytes (time) - modification time in Unix format
1 byte (uint8) - extra flags // 2 - compressor used maximum compression, slowest algorithm
// 4 - compressor used fastest algorithm
1 byte (uint8) - operating system / file system // 0 - FAT filesystem (MS-DOS, OS/2, NT/Win32)
// 1 - Amiga
// 2 - VMS (or OpenVMS)
// 3 - Unix
// 4 - VM/CMS
// 5 - Atari TOS
// 6 - HPFS filesystem (OS/2, NT)
// 7 - Macintosh
// 8 - Z-System
// 9 - CP/M
// 10 - TOPS-20
// 11 - NTFS filesystem (NT)
// 12 - QDOS
// 13 - Acorn RISCOS
// 255 - unknown
// extra header
x bytes - optional extra header
// body
x bytes - body with DEFLATE compressed payload
// footer
4 bytes - CRC32
4 bytes (uint32) - size of the original (uncompressed) input data modulo 2^32.
Notes and Comments
None.
Games
List of games using this file format:
- Deja Vu (*.DAT)
QuickBMS Script
Not written yet.
Compatible Programs
- Winrar (autodetecs files with GZ extension)
See Also
