Caleb Gardner
1d641259b2
Working on metadata parsing Runnning into some Reader issues so I might create my own.
62 lines
3.0 KiB
Go
62 lines
3.0 KiB
Go
package squashfs
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const squashfsMagic = 0x73717368
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//Superblock is a raw representation of a squashfs
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//Descriptions provided by https://dr-emann.github.io/squashfs/
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type Superblock struct {
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Magic uint32 //Magic will be 0x73717368 if it's a legit Squashfs filesystem
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Inodes uint32 //Inodes is the number of inodes in the inodes table
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MkfsTime uint32 //MkfsTime is when archive was created
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BlockSize uint32 //BlockSize is the size of data blocks in bytes
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Fragments uint32 //Fragments is the number of entries in fragment table
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Compression uint16 //Compression is what type of compression is used
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BlockLog uint16 //BlockLog should be log base 2 of BlockSize. If not then the squash might be corrupt
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Flags uint16 //Flags are the superblock's flags
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IDCount uint16 //IDCount is the number of IDs in the id lookup table
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Major uint16 //Major version of squashfs format
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Minor uint16 //Minor version of squashfs format
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RootInode uint64 //RootInode is a reference to the root of the squashfs
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BytesUsed uint64 //BytesUsed is how many bytes the archive is. squashfs archives are often padded to 4KB.
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IDTableOffset uint64 //IDTableOff is the byte offset of the IDTable
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XattrIDTableOffset uint64 //XattrIDTableOffset is the byte offset of the xattr id table
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InodeTableOffset uint64 //InodeTableOffset is the byte offset of the inode table
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DirectoryTableOffset uint64 //DirectoryTableOffset is the byte offset of the directory table
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FragmentTableOffset uint64 //FragmentTableOffset is the byte offset of the fragment table
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ExportTableOffset uint64 //ExportTableOffset is the byte offset of the export table
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}
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//SuperblockFlags is a parsed list of options set in Superblock.Flags
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type SuperblockFlags struct {
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UncompressedInodes bool
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UncompressedData bool
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Check bool //Check is unused in current versions of squashfs
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UncompressedFragments bool
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NoFragments bool
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AlwaysFragments bool
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Duplicates bool //Identical files are stored only once
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Exportable bool
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UncompressedXattrs bool
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NoXattrs bool
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CompressorOptions bool
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UncompressedIDs bool
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}
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//GetFlags returns the Flags parsed into a SuperblockFlags
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func (s *Superblock) GetFlags() SuperblockFlags {
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return SuperblockFlags{
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UncompressedInodes: s.Flags&0x1 == 0x1,
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UncompressedData: s.Flags&0x2 == 0x2,
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Check: s.Flags&0x4 == 0x4,
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UncompressedFragments: s.Flags&0x8 == 0x8,
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NoFragments: s.Flags&0x10 == 0x10,
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AlwaysFragments: s.Flags&0x20 == 0x20,
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Duplicates: s.Flags&0x40 == 0x40,
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Exportable: s.Flags&0x80 == 0x80,
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UncompressedXattrs: s.Flags&0x100 == 0x100,
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NoXattrs: s.Flags&0x200 == 0x200,
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CompressorOptions: s.Flags&0x400 == 0x400,
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UncompressedIDs: s.Flags&0x800 == 0x800,
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}
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}
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