Rename squashfs/squashfs to squashfs/low

squashfs/low library name is now squashfslow

low/superblock.go

@@ -0,0 +1,80 @@
+package squashfslow
+
+import "math"
+
+type superblock struct {
+	Magic            uint32
+	InodeCount       uint32
+	ModTime          uint32
+	BlockSize        uint32
+	FragCount        uint32
+	CompType         uint16
+	BlockLog         uint16
+	Flags            uint16
+	IdCount          uint16
+	VerMaj           uint16
+	VerMin           uint16
+	RootInodeRef     uint64
+	Size             uint64
+	IdTableStart     uint64
+	XattrTableStart  uint64
+	InodeTableStart  uint64
+	DirTableStart    uint64
+	FragTableStart   uint64
+	ExportTableStart uint64
+}
+
+func (s superblock) ValidMagic() bool {
+	return s.Magic == 0x73717368
+}
+
+func (s superblock) ValidBlockLog() bool {
+	return s.BlockLog == uint16(math.Log2(float64(s.BlockSize)))
+}
+
+func (s superblock) ValidVersion() bool {
+	return s.VerMaj == 4 && s.VerMin == 0
+}
+
+func (s superblock) UncompressedInodes() bool {
+	return s.Flags&0x1 == 0x1
+}
+
+func (s superblock) UncompressedData() bool {
+	return s.Flags&0x2 == 0x2
+}
+func (s superblock) UncompressedFragments() bool {
+	return s.Flags&0x8 == 0x8
+}
+
+func (s superblock) NoFragments() bool {
+	return s.Flags&0x10 == 0x10
+}
+
+func (s superblock) AlwaysFragment() bool {
+	return s.Flags&0x20 == 0x20
+}
+
+func (s superblock) Duplicates() bool {
+	return s.Flags&0x40 == 0x40
+}
+
+func (s superblock) Exportable() bool {
+	return s.Flags&0x80 == 0x80
+}
+
+func (s superblock) UncompressedXattrs() bool {
+	return s.Flags&0x100 == 0x100
+}
+
+func (s superblock) NoXattrs() bool {
+	return s.Flags&0x200 == 0x200
+}
+
+func (s superblock) CompressionOptions() bool {
+	return s.Flags&0x400 == 0x400
+}
+
+func (s superblock) UncompressedIDs() bool {
+	return s.Flags&0x800 == 0x800
+}