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magic/Magdir/dwarfs
44 строки
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Christos Zoulas
fix typos
23 май 2023, 16:37
23 май 2023, 16:37
12c550e
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#------------------------------------------------------------------------------ # $File: dwarfs,v 1.2 2023/05/23 13:37:32 christos Exp $ # dwarfs: file(1) magic for DwarFS File System Image files # URL: https://github.com/mhx/dwarfs for details about DwarFS # From: Marcus Holland-Moritz <github@mhxnet.de> #### DwarFS Version Macro 0 name dwarfsversion >&0 byte x \b, version %d >&1 byte x \b.%d #### DwarFS Compression Macro 0 name dwarfscompression >&0 leshort =0 \b, uncompressed >&0 leshort =1 \b, LZMA compression >&0 leshort =2 \b, ZSTD compression >&0 leshort =3 \b, LZ4 compression >&0 leshort =4 \b, LZ4HC compression >&0 leshort =5 \b, BROTLI compression #### DwarFS files without header ## We first check against a DWARFS magic at the start of the file, then ## validate by checking the block count / section type to be all zeros ## for the first block. Finally, we check that the *next* block also ## has the correct DWARFS magic. 0 string DWARFS >&0x2A string/b \0\0\0\0\0\0 >>&(&0x02.q+0x0A) string DWARFS DwarFS File System Image >>>&0 use dwarfsversion >>&0 use dwarfscompression #### DwarFS files with header ## We search for a DWARFS magic in the first 64k of the file (images with ## headers longer than 64k won't be recognized), then validate by checking ## the block count / section type to be all zeros for the first block. ## Finally, we check that the *next* block also has the correct DWARFS magic. ## If we find a DWARFS magic that doesn't pass validation, we continue with ## an indirect match recursively. 1 search/65536/b DWARFS >&0x2A string/b \0\0\0\0\0\0 >>&(&0x02.q+0x0A) string DWARFS DwarFS File System Image (with header) >>>&0 use dwarfsversion >>&0 use dwarfscompression >&-1 indirect x