mirror of
https://github.com/cwinfo/matterbridge.git
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47
vendor/github.com/klauspost/compress/s2/decode_other.go
generated
vendored
47
vendor/github.com/klauspost/compress/s2/decode_other.go
generated
vendored
@ -28,6 +28,9 @@ func s2Decode(dst, src []byte) int {
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// As long as we can read at least 5 bytes...
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for s < len(src)-5 {
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// Removing bounds checks is SLOWER, when if doing
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// in := src[s:s+5]
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// Checked on Go 1.18
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switch src[s] & 0x03 {
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case tagLiteral:
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x := uint32(src[s] >> 2)
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@ -38,17 +41,25 @@ func s2Decode(dst, src []byte) int {
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s += 2
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x = uint32(src[s-1])
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case x == 61:
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in := src[s : s+3]
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x = uint32(in[1]) | uint32(in[2])<<8
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s += 3
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x = uint32(src[s-2]) | uint32(src[s-1])<<8
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case x == 62:
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in := src[s : s+4]
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// Load as 32 bit and shift down.
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x = uint32(in[0]) | uint32(in[1])<<8 | uint32(in[2])<<16 | uint32(in[3])<<24
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x >>= 8
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s += 4
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x = uint32(src[s-3]) | uint32(src[s-2])<<8 | uint32(src[s-1])<<16
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case x == 63:
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in := src[s : s+5]
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x = uint32(in[1]) | uint32(in[2])<<8 | uint32(in[3])<<16 | uint32(in[4])<<24
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s += 5
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x = uint32(src[s-4]) | uint32(src[s-3])<<8 | uint32(src[s-2])<<16 | uint32(src[s-1])<<24
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}
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length = int(x) + 1
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if length > len(dst)-d || length > len(src)-s || (strconv.IntSize == 32 && length <= 0) {
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if debug {
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fmt.Println("corrupt: lit size", length)
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}
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return decodeErrCodeCorrupt
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}
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if debug {
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@ -62,8 +73,8 @@ func s2Decode(dst, src []byte) int {
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case tagCopy1:
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s += 2
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length = int(src[s-2]) >> 2 & 0x7
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toffset := int(uint32(src[s-2])&0xe0<<3 | uint32(src[s-1]))
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length = int(src[s-2]) >> 2 & 0x7
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if toffset == 0 {
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if debug {
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fmt.Print("(repeat) ")
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@ -71,14 +82,16 @@ func s2Decode(dst, src []byte) int {
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// keep last offset
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switch length {
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case 5:
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length = int(src[s]) + 4
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s += 1
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length = int(uint32(src[s-1])) + 4
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case 6:
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in := src[s : s+2]
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length = int(uint32(in[0])|(uint32(in[1])<<8)) + (1 << 8)
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s += 2
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length = int(uint32(src[s-2])|(uint32(src[s-1])<<8)) + (1 << 8)
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case 7:
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in := src[s : s+3]
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length = int((uint32(in[2])<<16)|(uint32(in[1])<<8)|uint32(in[0])) + (1 << 16)
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s += 3
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length = int(uint32(src[s-3])|(uint32(src[s-2])<<8)|(uint32(src[s-1])<<16)) + (1 << 16)
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default: // 0-> 4
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}
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} else {
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@ -86,17 +99,23 @@ func s2Decode(dst, src []byte) int {
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}
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length += 4
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case tagCopy2:
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in := src[s : s+3]
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offset = int(uint32(in[1]) | uint32(in[2])<<8)
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length = 1 + int(in[0])>>2
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s += 3
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length = 1 + int(src[s-3])>>2
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offset = int(uint32(src[s-2]) | uint32(src[s-1])<<8)
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case tagCopy4:
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in := src[s : s+5]
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offset = int(uint32(in[1]) | uint32(in[2])<<8 | uint32(in[3])<<16 | uint32(in[4])<<24)
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length = 1 + int(in[0])>>2
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s += 5
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length = 1 + int(src[s-5])>>2
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offset = int(uint32(src[s-4]) | uint32(src[s-3])<<8 | uint32(src[s-2])<<16 | uint32(src[s-1])<<24)
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}
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if offset <= 0 || d < offset || length > len(dst)-d {
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if debug {
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fmt.Println("corrupt: match, length", length, "offset:", offset, "dst avail:", len(dst)-d, "dst pos:", d)
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}
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return decodeErrCodeCorrupt
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}
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@ -163,6 +182,9 @@ func s2Decode(dst, src []byte) int {
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}
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length = int(x) + 1
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if length > len(dst)-d || length > len(src)-s || (strconv.IntSize == 32 && length <= 0) {
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if debug {
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fmt.Println("corrupt: lit size", length)
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}
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return decodeErrCodeCorrupt
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}
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if debug {
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@ -229,6 +251,9 @@ func s2Decode(dst, src []byte) int {
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}
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if offset <= 0 || d < offset || length > len(dst)-d {
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if debug {
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fmt.Println("corrupt: match, length", length, "offset:", offset, "dst avail:", len(dst)-d, "dst pos:", d)
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}
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return decodeErrCodeCorrupt
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}
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