#------------------------------------------------------------------------------
# $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 <[email protected]>

#### 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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