mirror of
https://github.com/mudler/luet.git
synced 2025-06-28 16:28:06 +00:00
4adc0dc9b9
Instead of using gox on one side and an action to release, we can merge them together with goreleaser which will build for extra targets (arm, mips if needed in the future) and it also takes care of creating checksums, a source archive, and a changelog and creating a release with all the artifacts. All binaries should respect the old naming convention, so any scripts out there should still work. Signed-off-by: Itxaka <igarcia@suse.com>
1003 lines
24 KiB
Go
1003 lines
24 KiB
Go
// Code generated by go generate gen_inflate.go. DO NOT EDIT.
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package flate
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import (
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"bufio"
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"bytes"
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"fmt"
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"math/bits"
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"strings"
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)
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// Decode a single Huffman block from f.
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// hl and hd are the Huffman states for the lit/length values
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// and the distance values, respectively. If hd == nil, using the
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// fixed distance encoding associated with fixed Huffman blocks.
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func (f *decompressor) huffmanBytesBuffer() {
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const (
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stateInit = iota // Zero value must be stateInit
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stateDict
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)
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fr := f.r.(*bytes.Buffer)
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switch f.stepState {
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case stateInit:
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goto readLiteral
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case stateDict:
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goto copyHistory
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}
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readLiteral:
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// Read literal and/or (length, distance) according to RFC section 3.2.3.
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{
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var v int
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{
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// Inlined v, err := f.huffSym(f.hl)
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// Since a huffmanDecoder can be empty or be composed of a degenerate tree
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// with single element, huffSym must error on these two edge cases. In both
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// cases, the chunks slice will be 0 for the invalid sequence, leading it
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// satisfy the n == 0 check below.
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n := uint(f.hl.maxRead)
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// Optimization. Compiler isn't smart enough to keep f.b,f.nb in registers,
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// but is smart enough to keep local variables in registers, so use nb and b,
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// inline call to moreBits and reassign b,nb back to f on return.
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nb, b := f.nb, f.b
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for {
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for nb < n {
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c, err := fr.ReadByte()
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if err != nil {
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f.b = b
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f.nb = nb
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f.err = noEOF(err)
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return
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}
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f.roffset++
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b |= uint32(c) << (nb & regSizeMaskUint32)
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nb += 8
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}
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chunk := f.hl.chunks[b&(huffmanNumChunks-1)]
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n = uint(chunk & huffmanCountMask)
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if n > huffmanChunkBits {
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chunk = f.hl.links[chunk>>huffmanValueShift][(b>>huffmanChunkBits)&f.hl.linkMask]
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n = uint(chunk & huffmanCountMask)
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}
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if n <= nb {
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if n == 0 {
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f.b = b
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f.nb = nb
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if debugDecode {
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fmt.Println("huffsym: n==0")
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}
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f.err = CorruptInputError(f.roffset)
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return
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}
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f.b = b >> (n & regSizeMaskUint32)
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f.nb = nb - n
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v = int(chunk >> huffmanValueShift)
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break
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}
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}
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}
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var length int
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switch {
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case v < 256:
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f.dict.writeByte(byte(v))
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if f.dict.availWrite() == 0 {
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f.toRead = f.dict.readFlush()
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f.step = (*decompressor).huffmanBytesBuffer
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f.stepState = stateInit
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return
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}
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goto readLiteral
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case v == 256:
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f.finishBlock()
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return
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// otherwise, reference to older data
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case v < 265:
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length = v - (257 - 3)
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case v < maxNumLit:
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val := decCodeToLen[(v - 257)]
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length = int(val.length) + 3
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n := uint(val.extra)
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for f.nb < n {
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c, err := fr.ReadByte()
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if err != nil {
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if debugDecode {
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fmt.Println("morebits n>0:", err)
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}
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f.err = err
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return
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}
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f.roffset++
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f.b |= uint32(c) << f.nb
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f.nb += 8
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}
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length += int(f.b & uint32(1<<(n®SizeMaskUint32)-1))
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f.b >>= n & regSizeMaskUint32
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f.nb -= n
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default:
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if debugDecode {
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fmt.Println(v, ">= maxNumLit")
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}
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f.err = CorruptInputError(f.roffset)
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return
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}
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var dist uint32
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if f.hd == nil {
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for f.nb < 5 {
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c, err := fr.ReadByte()
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if err != nil {
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if debugDecode {
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fmt.Println("morebits f.nb<5:", err)
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}
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f.err = err
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return
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}
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f.roffset++
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f.b |= uint32(c) << f.nb
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f.nb += 8
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}
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dist = uint32(bits.Reverse8(uint8(f.b & 0x1F << 3)))
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f.b >>= 5
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f.nb -= 5
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} else {
|
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// Since a huffmanDecoder can be empty or be composed of a degenerate tree
|
|
// with single element, huffSym must error on these two edge cases. In both
|
|
// cases, the chunks slice will be 0 for the invalid sequence, leading it
|
|
// satisfy the n == 0 check below.
|
|
n := uint(f.hd.maxRead)
|
|
// Optimization. Compiler isn't smart enough to keep f.b,f.nb in registers,
|
|
// but is smart enough to keep local variables in registers, so use nb and b,
|
|
// inline call to moreBits and reassign b,nb back to f on return.
|
|
nb, b := f.nb, f.b
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for {
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|
for nb < n {
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c, err := fr.ReadByte()
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if err != nil {
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f.b = b
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f.nb = nb
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f.err = noEOF(err)
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return
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}
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f.roffset++
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b |= uint32(c) << (nb & regSizeMaskUint32)
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nb += 8
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}
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chunk := f.hd.chunks[b&(huffmanNumChunks-1)]
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n = uint(chunk & huffmanCountMask)
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if n > huffmanChunkBits {
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chunk = f.hd.links[chunk>>huffmanValueShift][(b>>huffmanChunkBits)&f.hd.linkMask]
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n = uint(chunk & huffmanCountMask)
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|
}
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|
if n <= nb {
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|
if n == 0 {
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|
f.b = b
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f.nb = nb
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if debugDecode {
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fmt.Println("huffsym: n==0")
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|
}
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f.err = CorruptInputError(f.roffset)
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return
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}
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f.b = b >> (n & regSizeMaskUint32)
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f.nb = nb - n
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dist = uint32(chunk >> huffmanValueShift)
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break
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|
}
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}
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}
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switch {
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|
case dist < 4:
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dist++
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case dist < maxNumDist:
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nb := uint(dist-2) >> 1
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|
// have 1 bit in bottom of dist, need nb more.
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|
extra := (dist & 1) << (nb & regSizeMaskUint32)
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|
for f.nb < nb {
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|
c, err := fr.ReadByte()
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|
if err != nil {
|
|
if debugDecode {
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|
fmt.Println("morebits f.nb<nb:", err)
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|
}
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|
f.err = err
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return
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}
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f.roffset++
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f.b |= uint32(c) << f.nb
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f.nb += 8
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}
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extra |= f.b & uint32(1<<(nb®SizeMaskUint32)-1)
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f.b >>= nb & regSizeMaskUint32
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f.nb -= nb
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dist = 1<<((nb+1)®SizeMaskUint32) + 1 + extra
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default:
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if debugDecode {
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fmt.Println("dist too big:", dist, maxNumDist)
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}
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f.err = CorruptInputError(f.roffset)
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return
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}
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// No check on length; encoding can be prescient.
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if dist > uint32(f.dict.histSize()) {
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if debugDecode {
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fmt.Println("dist > f.dict.histSize():", dist, f.dict.histSize())
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|
}
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f.err = CorruptInputError(f.roffset)
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return
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}
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|
f.copyLen, f.copyDist = length, int(dist)
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goto copyHistory
|
|
}
|
|
|
|
copyHistory:
|
|
// Perform a backwards copy according to RFC section 3.2.3.
|
|
{
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|
cnt := f.dict.tryWriteCopy(f.copyDist, f.copyLen)
|
|
if cnt == 0 {
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|
cnt = f.dict.writeCopy(f.copyDist, f.copyLen)
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|
}
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|
f.copyLen -= cnt
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|
|
|
if f.dict.availWrite() == 0 || f.copyLen > 0 {
|
|
f.toRead = f.dict.readFlush()
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|
f.step = (*decompressor).huffmanBytesBuffer // We need to continue this work
|
|
f.stepState = stateDict
|
|
return
|
|
}
|
|
goto readLiteral
|
|
}
|
|
}
|
|
|
|
// Decode a single Huffman block from f.
|
|
// hl and hd are the Huffman states for the lit/length values
|
|
// and the distance values, respectively. If hd == nil, using the
|
|
// fixed distance encoding associated with fixed Huffman blocks.
|
|
func (f *decompressor) huffmanBytesReader() {
|
|
const (
|
|
stateInit = iota // Zero value must be stateInit
|
|
stateDict
|
|
)
|
|
fr := f.r.(*bytes.Reader)
|
|
|
|
switch f.stepState {
|
|
case stateInit:
|
|
goto readLiteral
|
|
case stateDict:
|
|
goto copyHistory
|
|
}
|
|
|
|
readLiteral:
|
|
// Read literal and/or (length, distance) according to RFC section 3.2.3.
|
|
{
|
|
var v int
|
|
{
|
|
// Inlined v, err := f.huffSym(f.hl)
|
|
// Since a huffmanDecoder can be empty or be composed of a degenerate tree
|
|
// with single element, huffSym must error on these two edge cases. In both
|
|
// cases, the chunks slice will be 0 for the invalid sequence, leading it
|
|
// satisfy the n == 0 check below.
|
|
n := uint(f.hl.maxRead)
|
|
// Optimization. Compiler isn't smart enough to keep f.b,f.nb in registers,
|
|
// but is smart enough to keep local variables in registers, so use nb and b,
|
|
// inline call to moreBits and reassign b,nb back to f on return.
|
|
nb, b := f.nb, f.b
|
|
for {
|
|
for nb < n {
|
|
c, err := fr.ReadByte()
|
|
if err != nil {
|
|
f.b = b
|
|
f.nb = nb
|
|
f.err = noEOF(err)
|
|
return
|
|
}
|
|
f.roffset++
|
|
b |= uint32(c) << (nb & regSizeMaskUint32)
|
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nb += 8
|
|
}
|
|
chunk := f.hl.chunks[b&(huffmanNumChunks-1)]
|
|
n = uint(chunk & huffmanCountMask)
|
|
if n > huffmanChunkBits {
|
|
chunk = f.hl.links[chunk>>huffmanValueShift][(b>>huffmanChunkBits)&f.hl.linkMask]
|
|
n = uint(chunk & huffmanCountMask)
|
|
}
|
|
if n <= nb {
|
|
if n == 0 {
|
|
f.b = b
|
|
f.nb = nb
|
|
if debugDecode {
|
|
fmt.Println("huffsym: n==0")
|
|
}
|
|
f.err = CorruptInputError(f.roffset)
|
|
return
|
|
}
|
|
f.b = b >> (n & regSizeMaskUint32)
|
|
f.nb = nb - n
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v = int(chunk >> huffmanValueShift)
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|
break
|
|
}
|
|
}
|
|
}
|
|
|
|
var length int
|
|
switch {
|
|
case v < 256:
|
|
f.dict.writeByte(byte(v))
|
|
if f.dict.availWrite() == 0 {
|
|
f.toRead = f.dict.readFlush()
|
|
f.step = (*decompressor).huffmanBytesReader
|
|
f.stepState = stateInit
|
|
return
|
|
}
|
|
goto readLiteral
|
|
case v == 256:
|
|
f.finishBlock()
|
|
return
|
|
// otherwise, reference to older data
|
|
case v < 265:
|
|
length = v - (257 - 3)
|
|
case v < maxNumLit:
|
|
val := decCodeToLen[(v - 257)]
|
|
length = int(val.length) + 3
|
|
n := uint(val.extra)
|
|
for f.nb < n {
|
|
c, err := fr.ReadByte()
|
|
if err != nil {
|
|
if debugDecode {
|
|
fmt.Println("morebits n>0:", err)
|
|
}
|
|
f.err = err
|
|
return
|
|
}
|
|
f.roffset++
|
|
f.b |= uint32(c) << f.nb
|
|
f.nb += 8
|
|
}
|
|
length += int(f.b & uint32(1<<(n®SizeMaskUint32)-1))
|
|
f.b >>= n & regSizeMaskUint32
|
|
f.nb -= n
|
|
default:
|
|
if debugDecode {
|
|
fmt.Println(v, ">= maxNumLit")
|
|
}
|
|
f.err = CorruptInputError(f.roffset)
|
|
return
|
|
}
|
|
|
|
var dist uint32
|
|
if f.hd == nil {
|
|
for f.nb < 5 {
|
|
c, err := fr.ReadByte()
|
|
if err != nil {
|
|
if debugDecode {
|
|
fmt.Println("morebits f.nb<5:", err)
|
|
}
|
|
f.err = err
|
|
return
|
|
}
|
|
f.roffset++
|
|
f.b |= uint32(c) << f.nb
|
|
f.nb += 8
|
|
}
|
|
dist = uint32(bits.Reverse8(uint8(f.b & 0x1F << 3)))
|
|
f.b >>= 5
|
|
f.nb -= 5
|
|
} else {
|
|
// Since a huffmanDecoder can be empty or be composed of a degenerate tree
|
|
// with single element, huffSym must error on these two edge cases. In both
|
|
// cases, the chunks slice will be 0 for the invalid sequence, leading it
|
|
// satisfy the n == 0 check below.
|
|
n := uint(f.hd.maxRead)
|
|
// Optimization. Compiler isn't smart enough to keep f.b,f.nb in registers,
|
|
// but is smart enough to keep local variables in registers, so use nb and b,
|
|
// inline call to moreBits and reassign b,nb back to f on return.
|
|
nb, b := f.nb, f.b
|
|
for {
|
|
for nb < n {
|
|
c, err := fr.ReadByte()
|
|
if err != nil {
|
|
f.b = b
|
|
f.nb = nb
|
|
f.err = noEOF(err)
|
|
return
|
|
}
|
|
f.roffset++
|
|
b |= uint32(c) << (nb & regSizeMaskUint32)
|
|
nb += 8
|
|
}
|
|
chunk := f.hd.chunks[b&(huffmanNumChunks-1)]
|
|
n = uint(chunk & huffmanCountMask)
|
|
if n > huffmanChunkBits {
|
|
chunk = f.hd.links[chunk>>huffmanValueShift][(b>>huffmanChunkBits)&f.hd.linkMask]
|
|
n = uint(chunk & huffmanCountMask)
|
|
}
|
|
if n <= nb {
|
|
if n == 0 {
|
|
f.b = b
|
|
f.nb = nb
|
|
if debugDecode {
|
|
fmt.Println("huffsym: n==0")
|
|
}
|
|
f.err = CorruptInputError(f.roffset)
|
|
return
|
|
}
|
|
f.b = b >> (n & regSizeMaskUint32)
|
|
f.nb = nb - n
|
|
dist = uint32(chunk >> huffmanValueShift)
|
|
break
|
|
}
|
|
}
|
|
}
|
|
|
|
switch {
|
|
case dist < 4:
|
|
dist++
|
|
case dist < maxNumDist:
|
|
nb := uint(dist-2) >> 1
|
|
// have 1 bit in bottom of dist, need nb more.
|
|
extra := (dist & 1) << (nb & regSizeMaskUint32)
|
|
for f.nb < nb {
|
|
c, err := fr.ReadByte()
|
|
if err != nil {
|
|
if debugDecode {
|
|
fmt.Println("morebits f.nb<nb:", err)
|
|
}
|
|
f.err = err
|
|
return
|
|
}
|
|
f.roffset++
|
|
f.b |= uint32(c) << f.nb
|
|
f.nb += 8
|
|
}
|
|
extra |= f.b & uint32(1<<(nb®SizeMaskUint32)-1)
|
|
f.b >>= nb & regSizeMaskUint32
|
|
f.nb -= nb
|
|
dist = 1<<((nb+1)®SizeMaskUint32) + 1 + extra
|
|
default:
|
|
if debugDecode {
|
|
fmt.Println("dist too big:", dist, maxNumDist)
|
|
}
|
|
f.err = CorruptInputError(f.roffset)
|
|
return
|
|
}
|
|
|
|
// No check on length; encoding can be prescient.
|
|
if dist > uint32(f.dict.histSize()) {
|
|
if debugDecode {
|
|
fmt.Println("dist > f.dict.histSize():", dist, f.dict.histSize())
|
|
}
|
|
f.err = CorruptInputError(f.roffset)
|
|
return
|
|
}
|
|
|
|
f.copyLen, f.copyDist = length, int(dist)
|
|
goto copyHistory
|
|
}
|
|
|
|
copyHistory:
|
|
// Perform a backwards copy according to RFC section 3.2.3.
|
|
{
|
|
cnt := f.dict.tryWriteCopy(f.copyDist, f.copyLen)
|
|
if cnt == 0 {
|
|
cnt = f.dict.writeCopy(f.copyDist, f.copyLen)
|
|
}
|
|
f.copyLen -= cnt
|
|
|
|
if f.dict.availWrite() == 0 || f.copyLen > 0 {
|
|
f.toRead = f.dict.readFlush()
|
|
f.step = (*decompressor).huffmanBytesReader // We need to continue this work
|
|
f.stepState = stateDict
|
|
return
|
|
}
|
|
goto readLiteral
|
|
}
|
|
}
|
|
|
|
// Decode a single Huffman block from f.
|
|
// hl and hd are the Huffman states for the lit/length values
|
|
// and the distance values, respectively. If hd == nil, using the
|
|
// fixed distance encoding associated with fixed Huffman blocks.
|
|
func (f *decompressor) huffmanBufioReader() {
|
|
const (
|
|
stateInit = iota // Zero value must be stateInit
|
|
stateDict
|
|
)
|
|
fr := f.r.(*bufio.Reader)
|
|
|
|
switch f.stepState {
|
|
case stateInit:
|
|
goto readLiteral
|
|
case stateDict:
|
|
goto copyHistory
|
|
}
|
|
|
|
readLiteral:
|
|
// Read literal and/or (length, distance) according to RFC section 3.2.3.
|
|
{
|
|
var v int
|
|
{
|
|
// Inlined v, err := f.huffSym(f.hl)
|
|
// Since a huffmanDecoder can be empty or be composed of a degenerate tree
|
|
// with single element, huffSym must error on these two edge cases. In both
|
|
// cases, the chunks slice will be 0 for the invalid sequence, leading it
|
|
// satisfy the n == 0 check below.
|
|
n := uint(f.hl.maxRead)
|
|
// Optimization. Compiler isn't smart enough to keep f.b,f.nb in registers,
|
|
// but is smart enough to keep local variables in registers, so use nb and b,
|
|
// inline call to moreBits and reassign b,nb back to f on return.
|
|
nb, b := f.nb, f.b
|
|
for {
|
|
for nb < n {
|
|
c, err := fr.ReadByte()
|
|
if err != nil {
|
|
f.b = b
|
|
f.nb = nb
|
|
f.err = noEOF(err)
|
|
return
|
|
}
|
|
f.roffset++
|
|
b |= uint32(c) << (nb & regSizeMaskUint32)
|
|
nb += 8
|
|
}
|
|
chunk := f.hl.chunks[b&(huffmanNumChunks-1)]
|
|
n = uint(chunk & huffmanCountMask)
|
|
if n > huffmanChunkBits {
|
|
chunk = f.hl.links[chunk>>huffmanValueShift][(b>>huffmanChunkBits)&f.hl.linkMask]
|
|
n = uint(chunk & huffmanCountMask)
|
|
}
|
|
if n <= nb {
|
|
if n == 0 {
|
|
f.b = b
|
|
f.nb = nb
|
|
if debugDecode {
|
|
fmt.Println("huffsym: n==0")
|
|
}
|
|
f.err = CorruptInputError(f.roffset)
|
|
return
|
|
}
|
|
f.b = b >> (n & regSizeMaskUint32)
|
|
f.nb = nb - n
|
|
v = int(chunk >> huffmanValueShift)
|
|
break
|
|
}
|
|
}
|
|
}
|
|
|
|
var length int
|
|
switch {
|
|
case v < 256:
|
|
f.dict.writeByte(byte(v))
|
|
if f.dict.availWrite() == 0 {
|
|
f.toRead = f.dict.readFlush()
|
|
f.step = (*decompressor).huffmanBufioReader
|
|
f.stepState = stateInit
|
|
return
|
|
}
|
|
goto readLiteral
|
|
case v == 256:
|
|
f.finishBlock()
|
|
return
|
|
// otherwise, reference to older data
|
|
case v < 265:
|
|
length = v - (257 - 3)
|
|
case v < maxNumLit:
|
|
val := decCodeToLen[(v - 257)]
|
|
length = int(val.length) + 3
|
|
n := uint(val.extra)
|
|
for f.nb < n {
|
|
c, err := fr.ReadByte()
|
|
if err != nil {
|
|
if debugDecode {
|
|
fmt.Println("morebits n>0:", err)
|
|
}
|
|
f.err = err
|
|
return
|
|
}
|
|
f.roffset++
|
|
f.b |= uint32(c) << f.nb
|
|
f.nb += 8
|
|
}
|
|
length += int(f.b & uint32(1<<(n®SizeMaskUint32)-1))
|
|
f.b >>= n & regSizeMaskUint32
|
|
f.nb -= n
|
|
default:
|
|
if debugDecode {
|
|
fmt.Println(v, ">= maxNumLit")
|
|
}
|
|
f.err = CorruptInputError(f.roffset)
|
|
return
|
|
}
|
|
|
|
var dist uint32
|
|
if f.hd == nil {
|
|
for f.nb < 5 {
|
|
c, err := fr.ReadByte()
|
|
if err != nil {
|
|
if debugDecode {
|
|
fmt.Println("morebits f.nb<5:", err)
|
|
}
|
|
f.err = err
|
|
return
|
|
}
|
|
f.roffset++
|
|
f.b |= uint32(c) << f.nb
|
|
f.nb += 8
|
|
}
|
|
dist = uint32(bits.Reverse8(uint8(f.b & 0x1F << 3)))
|
|
f.b >>= 5
|
|
f.nb -= 5
|
|
} else {
|
|
// Since a huffmanDecoder can be empty or be composed of a degenerate tree
|
|
// with single element, huffSym must error on these two edge cases. In both
|
|
// cases, the chunks slice will be 0 for the invalid sequence, leading it
|
|
// satisfy the n == 0 check below.
|
|
n := uint(f.hd.maxRead)
|
|
// Optimization. Compiler isn't smart enough to keep f.b,f.nb in registers,
|
|
// but is smart enough to keep local variables in registers, so use nb and b,
|
|
// inline call to moreBits and reassign b,nb back to f on return.
|
|
nb, b := f.nb, f.b
|
|
for {
|
|
for nb < n {
|
|
c, err := fr.ReadByte()
|
|
if err != nil {
|
|
f.b = b
|
|
f.nb = nb
|
|
f.err = noEOF(err)
|
|
return
|
|
}
|
|
f.roffset++
|
|
b |= uint32(c) << (nb & regSizeMaskUint32)
|
|
nb += 8
|
|
}
|
|
chunk := f.hd.chunks[b&(huffmanNumChunks-1)]
|
|
n = uint(chunk & huffmanCountMask)
|
|
if n > huffmanChunkBits {
|
|
chunk = f.hd.links[chunk>>huffmanValueShift][(b>>huffmanChunkBits)&f.hd.linkMask]
|
|
n = uint(chunk & huffmanCountMask)
|
|
}
|
|
if n <= nb {
|
|
if n == 0 {
|
|
f.b = b
|
|
f.nb = nb
|
|
if debugDecode {
|
|
fmt.Println("huffsym: n==0")
|
|
}
|
|
f.err = CorruptInputError(f.roffset)
|
|
return
|
|
}
|
|
f.b = b >> (n & regSizeMaskUint32)
|
|
f.nb = nb - n
|
|
dist = uint32(chunk >> huffmanValueShift)
|
|
break
|
|
}
|
|
}
|
|
}
|
|
|
|
switch {
|
|
case dist < 4:
|
|
dist++
|
|
case dist < maxNumDist:
|
|
nb := uint(dist-2) >> 1
|
|
// have 1 bit in bottom of dist, need nb more.
|
|
extra := (dist & 1) << (nb & regSizeMaskUint32)
|
|
for f.nb < nb {
|
|
c, err := fr.ReadByte()
|
|
if err != nil {
|
|
if debugDecode {
|
|
fmt.Println("morebits f.nb<nb:", err)
|
|
}
|
|
f.err = err
|
|
return
|
|
}
|
|
f.roffset++
|
|
f.b |= uint32(c) << f.nb
|
|
f.nb += 8
|
|
}
|
|
extra |= f.b & uint32(1<<(nb®SizeMaskUint32)-1)
|
|
f.b >>= nb & regSizeMaskUint32
|
|
f.nb -= nb
|
|
dist = 1<<((nb+1)®SizeMaskUint32) + 1 + extra
|
|
default:
|
|
if debugDecode {
|
|
fmt.Println("dist too big:", dist, maxNumDist)
|
|
}
|
|
f.err = CorruptInputError(f.roffset)
|
|
return
|
|
}
|
|
|
|
// No check on length; encoding can be prescient.
|
|
if dist > uint32(f.dict.histSize()) {
|
|
if debugDecode {
|
|
fmt.Println("dist > f.dict.histSize():", dist, f.dict.histSize())
|
|
}
|
|
f.err = CorruptInputError(f.roffset)
|
|
return
|
|
}
|
|
|
|
f.copyLen, f.copyDist = length, int(dist)
|
|
goto copyHistory
|
|
}
|
|
|
|
copyHistory:
|
|
// Perform a backwards copy according to RFC section 3.2.3.
|
|
{
|
|
cnt := f.dict.tryWriteCopy(f.copyDist, f.copyLen)
|
|
if cnt == 0 {
|
|
cnt = f.dict.writeCopy(f.copyDist, f.copyLen)
|
|
}
|
|
f.copyLen -= cnt
|
|
|
|
if f.dict.availWrite() == 0 || f.copyLen > 0 {
|
|
f.toRead = f.dict.readFlush()
|
|
f.step = (*decompressor).huffmanBufioReader // We need to continue this work
|
|
f.stepState = stateDict
|
|
return
|
|
}
|
|
goto readLiteral
|
|
}
|
|
}
|
|
|
|
// Decode a single Huffman block from f.
|
|
// hl and hd are the Huffman states for the lit/length values
|
|
// and the distance values, respectively. If hd == nil, using the
|
|
// fixed distance encoding associated with fixed Huffman blocks.
|
|
func (f *decompressor) huffmanStringsReader() {
|
|
const (
|
|
stateInit = iota // Zero value must be stateInit
|
|
stateDict
|
|
)
|
|
fr := f.r.(*strings.Reader)
|
|
|
|
switch f.stepState {
|
|
case stateInit:
|
|
goto readLiteral
|
|
case stateDict:
|
|
goto copyHistory
|
|
}
|
|
|
|
readLiteral:
|
|
// Read literal and/or (length, distance) according to RFC section 3.2.3.
|
|
{
|
|
var v int
|
|
{
|
|
// Inlined v, err := f.huffSym(f.hl)
|
|
// Since a huffmanDecoder can be empty or be composed of a degenerate tree
|
|
// with single element, huffSym must error on these two edge cases. In both
|
|
// cases, the chunks slice will be 0 for the invalid sequence, leading it
|
|
// satisfy the n == 0 check below.
|
|
n := uint(f.hl.maxRead)
|
|
// Optimization. Compiler isn't smart enough to keep f.b,f.nb in registers,
|
|
// but is smart enough to keep local variables in registers, so use nb and b,
|
|
// inline call to moreBits and reassign b,nb back to f on return.
|
|
nb, b := f.nb, f.b
|
|
for {
|
|
for nb < n {
|
|
c, err := fr.ReadByte()
|
|
if err != nil {
|
|
f.b = b
|
|
f.nb = nb
|
|
f.err = noEOF(err)
|
|
return
|
|
}
|
|
f.roffset++
|
|
b |= uint32(c) << (nb & regSizeMaskUint32)
|
|
nb += 8
|
|
}
|
|
chunk := f.hl.chunks[b&(huffmanNumChunks-1)]
|
|
n = uint(chunk & huffmanCountMask)
|
|
if n > huffmanChunkBits {
|
|
chunk = f.hl.links[chunk>>huffmanValueShift][(b>>huffmanChunkBits)&f.hl.linkMask]
|
|
n = uint(chunk & huffmanCountMask)
|
|
}
|
|
if n <= nb {
|
|
if n == 0 {
|
|
f.b = b
|
|
f.nb = nb
|
|
if debugDecode {
|
|
fmt.Println("huffsym: n==0")
|
|
}
|
|
f.err = CorruptInputError(f.roffset)
|
|
return
|
|
}
|
|
f.b = b >> (n & regSizeMaskUint32)
|
|
f.nb = nb - n
|
|
v = int(chunk >> huffmanValueShift)
|
|
break
|
|
}
|
|
}
|
|
}
|
|
|
|
var length int
|
|
switch {
|
|
case v < 256:
|
|
f.dict.writeByte(byte(v))
|
|
if f.dict.availWrite() == 0 {
|
|
f.toRead = f.dict.readFlush()
|
|
f.step = (*decompressor).huffmanStringsReader
|
|
f.stepState = stateInit
|
|
return
|
|
}
|
|
goto readLiteral
|
|
case v == 256:
|
|
f.finishBlock()
|
|
return
|
|
// otherwise, reference to older data
|
|
case v < 265:
|
|
length = v - (257 - 3)
|
|
case v < maxNumLit:
|
|
val := decCodeToLen[(v - 257)]
|
|
length = int(val.length) + 3
|
|
n := uint(val.extra)
|
|
for f.nb < n {
|
|
c, err := fr.ReadByte()
|
|
if err != nil {
|
|
if debugDecode {
|
|
fmt.Println("morebits n>0:", err)
|
|
}
|
|
f.err = err
|
|
return
|
|
}
|
|
f.roffset++
|
|
f.b |= uint32(c) << f.nb
|
|
f.nb += 8
|
|
}
|
|
length += int(f.b & uint32(1<<(n®SizeMaskUint32)-1))
|
|
f.b >>= n & regSizeMaskUint32
|
|
f.nb -= n
|
|
default:
|
|
if debugDecode {
|
|
fmt.Println(v, ">= maxNumLit")
|
|
}
|
|
f.err = CorruptInputError(f.roffset)
|
|
return
|
|
}
|
|
|
|
var dist uint32
|
|
if f.hd == nil {
|
|
for f.nb < 5 {
|
|
c, err := fr.ReadByte()
|
|
if err != nil {
|
|
if debugDecode {
|
|
fmt.Println("morebits f.nb<5:", err)
|
|
}
|
|
f.err = err
|
|
return
|
|
}
|
|
f.roffset++
|
|
f.b |= uint32(c) << f.nb
|
|
f.nb += 8
|
|
}
|
|
dist = uint32(bits.Reverse8(uint8(f.b & 0x1F << 3)))
|
|
f.b >>= 5
|
|
f.nb -= 5
|
|
} else {
|
|
// Since a huffmanDecoder can be empty or be composed of a degenerate tree
|
|
// with single element, huffSym must error on these two edge cases. In both
|
|
// cases, the chunks slice will be 0 for the invalid sequence, leading it
|
|
// satisfy the n == 0 check below.
|
|
n := uint(f.hd.maxRead)
|
|
// Optimization. Compiler isn't smart enough to keep f.b,f.nb in registers,
|
|
// but is smart enough to keep local variables in registers, so use nb and b,
|
|
// inline call to moreBits and reassign b,nb back to f on return.
|
|
nb, b := f.nb, f.b
|
|
for {
|
|
for nb < n {
|
|
c, err := fr.ReadByte()
|
|
if err != nil {
|
|
f.b = b
|
|
f.nb = nb
|
|
f.err = noEOF(err)
|
|
return
|
|
}
|
|
f.roffset++
|
|
b |= uint32(c) << (nb & regSizeMaskUint32)
|
|
nb += 8
|
|
}
|
|
chunk := f.hd.chunks[b&(huffmanNumChunks-1)]
|
|
n = uint(chunk & huffmanCountMask)
|
|
if n > huffmanChunkBits {
|
|
chunk = f.hd.links[chunk>>huffmanValueShift][(b>>huffmanChunkBits)&f.hd.linkMask]
|
|
n = uint(chunk & huffmanCountMask)
|
|
}
|
|
if n <= nb {
|
|
if n == 0 {
|
|
f.b = b
|
|
f.nb = nb
|
|
if debugDecode {
|
|
fmt.Println("huffsym: n==0")
|
|
}
|
|
f.err = CorruptInputError(f.roffset)
|
|
return
|
|
}
|
|
f.b = b >> (n & regSizeMaskUint32)
|
|
f.nb = nb - n
|
|
dist = uint32(chunk >> huffmanValueShift)
|
|
break
|
|
}
|
|
}
|
|
}
|
|
|
|
switch {
|
|
case dist < 4:
|
|
dist++
|
|
case dist < maxNumDist:
|
|
nb := uint(dist-2) >> 1
|
|
// have 1 bit in bottom of dist, need nb more.
|
|
extra := (dist & 1) << (nb & regSizeMaskUint32)
|
|
for f.nb < nb {
|
|
c, err := fr.ReadByte()
|
|
if err != nil {
|
|
if debugDecode {
|
|
fmt.Println("morebits f.nb<nb:", err)
|
|
}
|
|
f.err = err
|
|
return
|
|
}
|
|
f.roffset++
|
|
f.b |= uint32(c) << f.nb
|
|
f.nb += 8
|
|
}
|
|
extra |= f.b & uint32(1<<(nb®SizeMaskUint32)-1)
|
|
f.b >>= nb & regSizeMaskUint32
|
|
f.nb -= nb
|
|
dist = 1<<((nb+1)®SizeMaskUint32) + 1 + extra
|
|
default:
|
|
if debugDecode {
|
|
fmt.Println("dist too big:", dist, maxNumDist)
|
|
}
|
|
f.err = CorruptInputError(f.roffset)
|
|
return
|
|
}
|
|
|
|
// No check on length; encoding can be prescient.
|
|
if dist > uint32(f.dict.histSize()) {
|
|
if debugDecode {
|
|
fmt.Println("dist > f.dict.histSize():", dist, f.dict.histSize())
|
|
}
|
|
f.err = CorruptInputError(f.roffset)
|
|
return
|
|
}
|
|
|
|
f.copyLen, f.copyDist = length, int(dist)
|
|
goto copyHistory
|
|
}
|
|
|
|
copyHistory:
|
|
// Perform a backwards copy according to RFC section 3.2.3.
|
|
{
|
|
cnt := f.dict.tryWriteCopy(f.copyDist, f.copyLen)
|
|
if cnt == 0 {
|
|
cnt = f.dict.writeCopy(f.copyDist, f.copyLen)
|
|
}
|
|
f.copyLen -= cnt
|
|
|
|
if f.dict.availWrite() == 0 || f.copyLen > 0 {
|
|
f.toRead = f.dict.readFlush()
|
|
f.step = (*decompressor).huffmanStringsReader // We need to continue this work
|
|
f.stepState = stateDict
|
|
return
|
|
}
|
|
goto readLiteral
|
|
}
|
|
}
|
|
|
|
func (f *decompressor) huffmanBlockDecoder() func() {
|
|
switch f.r.(type) {
|
|
case *bytes.Buffer:
|
|
return f.huffmanBytesBuffer
|
|
case *bytes.Reader:
|
|
return f.huffmanBytesReader
|
|
case *bufio.Reader:
|
|
return f.huffmanBufioReader
|
|
case *strings.Reader:
|
|
return f.huffmanStringsReader
|
|
default:
|
|
return f.huffmanBlockGeneric
|
|
}
|
|
}
|