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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
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