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Update dependencies (#1851)
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65
vendor/github.com/klauspost/compress/zstd/fse_decoder.go
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vendored
65
vendor/github.com/klauspost/compress/zstd/fse_decoder.go
generated
vendored
@ -5,8 +5,10 @@
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package zstd
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import (
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"encoding/binary"
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"errors"
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"fmt"
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"io"
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)
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const (
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@ -182,6 +184,29 @@ func (s *fseDecoder) readNCount(b *byteReader, maxSymbol uint16) error {
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return s.buildDtable()
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}
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func (s *fseDecoder) mustReadFrom(r io.Reader) {
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fatalErr := func(err error) {
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if err != nil {
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panic(err)
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}
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}
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// dt [maxTablesize]decSymbol // Decompression table.
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// symbolLen uint16 // Length of active part of the symbol table.
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// actualTableLog uint8 // Selected tablelog.
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// maxBits uint8 // Maximum number of additional bits
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// // used for table creation to avoid allocations.
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// stateTable [256]uint16
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// norm [maxSymbolValue + 1]int16
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// preDefined bool
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fatalErr(binary.Read(r, binary.LittleEndian, &s.dt))
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fatalErr(binary.Read(r, binary.LittleEndian, &s.symbolLen))
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fatalErr(binary.Read(r, binary.LittleEndian, &s.actualTableLog))
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fatalErr(binary.Read(r, binary.LittleEndian, &s.maxBits))
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fatalErr(binary.Read(r, binary.LittleEndian, &s.stateTable))
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fatalErr(binary.Read(r, binary.LittleEndian, &s.norm))
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fatalErr(binary.Read(r, binary.LittleEndian, &s.preDefined))
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}
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// decSymbol contains information about a state entry,
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// Including the state offset base, the output symbol and
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// the number of bits to read for the low part of the destination state.
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@ -204,18 +229,10 @@ func (d decSymbol) newState() uint16 {
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return uint16(d >> 16)
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}
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func (d decSymbol) baseline() uint32 {
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return uint32(d >> 32)
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}
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func (d decSymbol) baselineInt() int {
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return int(d >> 32)
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}
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func (d *decSymbol) set(nbits, addBits uint8, newState uint16, baseline uint32) {
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*d = decSymbol(nbits) | (decSymbol(addBits) << 8) | (decSymbol(newState) << 16) | (decSymbol(baseline) << 32)
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}
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func (d *decSymbol) setNBits(nBits uint8) {
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const mask = 0xffffffffffffff00
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*d = (*d & mask) | decSymbol(nBits)
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@ -231,11 +248,6 @@ func (d *decSymbol) setNewState(state uint16) {
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*d = (*d & mask) | decSymbol(state)<<16
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}
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func (d *decSymbol) setBaseline(baseline uint32) {
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const mask = 0xffffffff
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*d = (*d & mask) | decSymbol(baseline)<<32
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}
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func (d *decSymbol) setExt(addBits uint8, baseline uint32) {
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const mask = 0xffff00ff
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*d = (*d & mask) | (decSymbol(addBits) << 8) | (decSymbol(baseline) << 32)
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@ -352,34 +364,7 @@ func (s *fseState) init(br *bitReader, tableLog uint8, dt []decSymbol) {
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s.state = dt[br.getBits(tableLog)]
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}
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// next returns the current symbol and sets the next state.
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// At least tablelog bits must be available in the bit reader.
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func (s *fseState) next(br *bitReader) {
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lowBits := uint16(br.getBits(s.state.nbBits()))
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s.state = s.dt[s.state.newState()+lowBits]
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}
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// finished returns true if all bits have been read from the bitstream
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// and the next state would require reading bits from the input.
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func (s *fseState) finished(br *bitReader) bool {
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return br.finished() && s.state.nbBits() > 0
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}
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// final returns the current state symbol without decoding the next.
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func (s *fseState) final() (int, uint8) {
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return s.state.baselineInt(), s.state.addBits()
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}
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// final returns the current state symbol without decoding the next.
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func (s decSymbol) final() (int, uint8) {
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return s.baselineInt(), s.addBits()
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}
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// nextFast returns the next symbol and sets the next state.
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// This can only be used if no symbols are 0 bits.
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// At least tablelog bits must be available in the bit reader.
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func (s *fseState) nextFast(br *bitReader) (uint32, uint8) {
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lowBits := br.get16BitsFast(s.state.nbBits())
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s.state = s.dt[s.state.newState()+lowBits]
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return s.state.baseline(), s.state.addBits()
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}
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