bench-forgejo/vendor/github.com/klauspost/compress/flate/gen_inflate.go
6543 12a1f914f4
Vendor Update Go Libs (#13166)
* update github.com/alecthomas/chroma v0.8.0 -> v0.8.1

* github.com/blevesearch/bleve v1.0.10 -> v1.0.12

* editorconfig-core-go v2.1.1 -> v2.3.7

* github.com/gliderlabs/ssh v0.2.2 -> v0.3.1

* migrate editorconfig.ParseBytes to Parse

* github.com/shurcooL/vfsgen to 0d455de96546

* github.com/go-git/go-git/v5 v5.1.0 -> v5.2.0

* github.com/google/uuid v1.1.1 -> v1.1.2

* github.com/huandu/xstrings v1.3.0 -> v1.3.2

* github.com/klauspost/compress v1.10.11 -> v1.11.1

* github.com/markbates/goth v1.61.2 -> v1.65.0

* github.com/mattn/go-sqlite3 v1.14.0 -> v1.14.4

* github.com/mholt/archiver v3.3.0 -> v3.3.2

* github.com/microcosm-cc/bluemonday 4f7140c49acb -> v1.0.4

* github.com/minio/minio-go v7.0.4 -> v7.0.5

* github.com/olivere/elastic v7.0.9 -> v7.0.20

* github.com/urfave/cli v1.20.0 -> v1.22.4

* github.com/prometheus/client_golang v1.1.0 -> v1.8.0

* github.com/xanzy/go-gitlab v0.37.0 -> v0.38.1

* mvdan.cc/xurls v2.1.0 -> v2.2.0

Co-authored-by: Lauris BH <lauris@nix.lv>
2020-10-16 01:06:27 -04:00

276 lines
6.3 KiB
Go
Vendored

// +build generate
//go:generate go run $GOFILE && gofmt -w inflate_gen.go
package main
import (
"os"
"strings"
)
func main() {
f, err := os.Create("inflate_gen.go")
if err != nil {
panic(err)
}
defer f.Close()
types := []string{"*bytes.Buffer", "*bytes.Reader", "*bufio.Reader", "*strings.Reader"}
names := []string{"BytesBuffer", "BytesReader", "BufioReader", "StringsReader"}
imports := []string{"bytes", "bufio", "io", "strings", "math/bits"}
f.WriteString(`// Code generated by go generate gen_inflate.go. DO NOT EDIT.
package flate
import (
`)
for _, imp := range imports {
f.WriteString("\t\"" + imp + "\"\n")
}
f.WriteString(")\n\n")
template := `
// 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) $FUNCNAME$() {
const (
stateInit = iota // Zero value must be stateInit
stateDict
)
fr := f.r.($TYPE$)
moreBits := func() error {
c, err := fr.ReadByte()
if err != nil {
return noEOF(err)
}
f.roffset++
f.b |= uint32(c) << f.nb
f.nb += 8
return nil
}
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 n uint // number of bits extra
var length int
var err error
switch {
case v < 256:
f.dict.writeByte(byte(v))
if f.dict.availWrite() == 0 {
f.toRead = f.dict.readFlush()
f.step = (*decompressor).$FUNCNAME$
f.stepState = stateInit
return
}
goto readLiteral
case v == 256:
f.finishBlock()
return
// otherwise, reference to older data
case v < 265:
length = v - (257 - 3)
n = 0
case v < 269:
length = v*2 - (265*2 - 11)
n = 1
case v < 273:
length = v*4 - (269*4 - 19)
n = 2
case v < 277:
length = v*8 - (273*8 - 35)
n = 3
case v < 281:
length = v*16 - (277*16 - 67)
n = 4
case v < 285:
length = v*32 - (281*32 - 131)
n = 5
case v < maxNumLit:
length = 258
n = 0
default:
if debugDecode {
fmt.Println(v, ">= maxNumLit")
}
f.err = CorruptInputError(f.roffset)
return
}
if n > 0 {
for f.nb < n {
if err = moreBits(); err != nil {
if debugDecode {
fmt.Println("morebits n>0:", err)
}
f.err = err
return
}
}
length += int(f.b & uint32(1<<(n&regSizeMaskUint32)-1))
f.b >>= n & regSizeMaskUint32
f.nb -= n
}
var dist uint32
if f.hd == nil {
for f.nb < 5 {
if err = f.moreBits(); err != nil {
if debugDecode {
fmt.Println("morebits f.nb<5:", err)
}
f.err = err
return
}
}
dist = uint32(bits.Reverse8(uint8(f.b & 0x1F << 3)))
f.b >>= 5
f.nb -= 5
} else {
sym, err := f.huffSym(f.hd)
if err != nil {
if debugDecode {
fmt.Println("huffsym:", err)
}
f.err = err
return
}
dist = uint32(sym)
}
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 {
if err = f.moreBits(); err != nil {
if debugDecode {
fmt.Println("morebits f.nb<nb:", err)
}
f.err = err
return
}
}
extra |= f.b & uint32(1<<(nb&regSizeMaskUint32)-1)
f.b >>= nb & regSizeMaskUint32
f.nb -= nb
dist = 1<<((nb+1)&regSizeMaskUint32) + 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).$FUNCNAME$ // We need to continue this work
f.stepState = stateDict
return
}
goto readLiteral
}
}
`
for i, t := range types {
s := strings.Replace(template, "$FUNCNAME$", "huffman"+names[i], -1)
s = strings.Replace(s, "$TYPE$", t, -1)
f.WriteString(s)
}
f.WriteString("func (f *decompressor) huffmanBlockDecoder() func() {\n")
f.WriteString("\tswitch f.r.(type) {\n")
for i, t := range types {
f.WriteString("\t\tcase " + t + ":\n")
f.WriteString("\t\t\treturn f.huffman" + names[i] + "\n")
}
f.WriteString("\t\tdefault:\n")
f.WriteString("\t\t\treturn f.huffmanBlockGeneric")
f.WriteString("\t}\n}\n")
}