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684b7a999f
* Dump: Use mholt/archive/v3 to support tar including many compressions Signed-off-by: Philipp Homann <homann.philipp@googlemail.com> * Dump: Allow dump output to stdout Signed-off-by: Philipp Homann <homann.philipp@googlemail.com> * Dump: Fixed bug present since #6677 where SessionConfig.Provider is never "file" Signed-off-by: Philipp Homann <homann.philipp@googlemail.com> * Dump: never pack RepoRootPath, LFS.ContentPath and LogRootPath when they are below AppDataPath Signed-off-by: Philipp Homann <homann.philipp@googlemail.com> * Dump: also dump LFS (fixes #10058) Signed-off-by: Philipp Homann <homann.philipp@googlemail.com> * Dump: never dump CustomPath if CustomPath is a subdir of or equal to AppDataPath (fixes #10365) Signed-off-by: Philipp Homann <homann.philipp@googlemail.com> * Use log.Info instead of fmt.Fprintf Signed-off-by: Philipp Homann <homann.philipp@googlemail.com> * import ordering * make fmt Co-authored-by: zeripath <art27@cantab.net> Co-authored-by: techknowlogick <techknowlogick@gitea.io> Co-authored-by: Matti R <matti@mdranta.net>
248 lines
5.0 KiB
Go
Vendored
248 lines
5.0 KiB
Go
Vendored
package rardecode
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const (
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mainSize = 299
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offsetSize = 60
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lowOffsetSize = 17
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lengthSize = 28
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tableSize = mainSize + offsetSize + lowOffsetSize + lengthSize
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)
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var (
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lengthBase = [28]int{0, 1, 2, 3, 4, 5, 6, 7, 8, 10, 12, 14, 16, 20,
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24, 28, 32, 40, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224}
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lengthExtraBits = [28]uint{0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2,
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2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5}
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offsetBase = [60]int{0, 1, 2, 3, 4, 6, 8, 12, 16, 24, 32, 48, 64, 96,
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128, 192, 256, 384, 512, 768, 1024, 1536, 2048, 3072, 4096,
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6144, 8192, 12288, 16384, 24576, 32768, 49152, 65536, 98304,
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131072, 196608, 262144, 327680, 393216, 458752, 524288,
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589824, 655360, 720896, 786432, 851968, 917504, 983040,
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1048576, 1310720, 1572864, 1835008, 2097152, 2359296, 2621440,
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2883584, 3145728, 3407872, 3670016, 3932160}
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offsetExtraBits = [60]uint{0, 0, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6,
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6, 7, 7, 8, 8, 9, 9, 10, 10, 11, 11, 12, 12, 13, 13, 14, 14,
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15, 15, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16,
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18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18}
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shortOffsetBase = [8]int{0, 4, 8, 16, 32, 64, 128, 192}
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shortOffsetExtraBits = [8]uint{2, 2, 3, 4, 5, 6, 6, 6}
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)
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type lz29Decoder struct {
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codeLength [tableSize]byte
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mainDecoder huffmanDecoder
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offsetDecoder huffmanDecoder
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lowOffsetDecoder huffmanDecoder
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lengthDecoder huffmanDecoder
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offset [4]int // history of previous offsets
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length int // previous length
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lowOffset int
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lowOffsetRepeats int
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br *rarBitReader
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}
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func (d *lz29Decoder) reset() {
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for i := range d.offset {
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d.offset[i] = 0
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}
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d.length = 0
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for i := range d.codeLength {
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d.codeLength[i] = 0
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}
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}
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func (d *lz29Decoder) init(br *rarBitReader) error {
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d.br = br
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d.lowOffset = 0
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d.lowOffsetRepeats = 0
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n, err := d.br.readBits(1)
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if err != nil {
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return err
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}
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addOld := n > 0
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cl := d.codeLength[:]
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if err = readCodeLengthTable(d.br, cl, addOld); err != nil {
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return err
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}
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d.mainDecoder.init(cl[:mainSize])
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cl = cl[mainSize:]
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d.offsetDecoder.init(cl[:offsetSize])
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cl = cl[offsetSize:]
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d.lowOffsetDecoder.init(cl[:lowOffsetSize])
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cl = cl[lowOffsetSize:]
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d.lengthDecoder.init(cl)
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return nil
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}
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func (d *lz29Decoder) readFilterData() (b []byte, err error) {
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flags, err := d.br.ReadByte()
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if err != nil {
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return nil, err
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}
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n := (int(flags) & 7) + 1
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switch n {
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case 7:
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n, err = d.br.readBits(8)
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n += 7
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if err != nil {
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return nil, err
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}
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case 8:
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n, err = d.br.readBits(16)
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if err != nil {
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return nil, err
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}
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}
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buf := make([]byte, n+1)
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buf[0] = flags
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err = d.br.readFull(buf[1:])
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return buf, err
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}
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func (d *lz29Decoder) readEndOfBlock() error {
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n, err := d.br.readBits(1)
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if err != nil {
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return err
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}
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if n > 0 {
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return endOfBlock
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}
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n, err = d.br.readBits(1)
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if err != nil {
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return err
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}
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if n > 0 {
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return endOfBlockAndFile
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}
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return endOfFile
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}
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func (d *lz29Decoder) decode(win *window) ([]byte, error) {
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sym, err := d.mainDecoder.readSym(d.br)
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if err != nil {
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return nil, err
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}
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switch {
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case sym < 256:
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// literal
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win.writeByte(byte(sym))
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return nil, nil
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case sym == 256:
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return nil, d.readEndOfBlock()
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case sym == 257:
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return d.readFilterData()
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case sym == 258:
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// use previous offset and length
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case sym < 263:
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i := sym - 259
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offset := d.offset[i]
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copy(d.offset[1:i+1], d.offset[:i])
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d.offset[0] = offset
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i, err := d.lengthDecoder.readSym(d.br)
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if err != nil {
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return nil, err
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}
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d.length = lengthBase[i] + 2
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bits := lengthExtraBits[i]
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if bits > 0 {
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n, err := d.br.readBits(bits)
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if err != nil {
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return nil, err
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}
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d.length += n
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}
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case sym < 271:
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i := sym - 263
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copy(d.offset[1:], d.offset[:])
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offset := shortOffsetBase[i] + 1
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bits := shortOffsetExtraBits[i]
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if bits > 0 {
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n, err := d.br.readBits(bits)
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if err != nil {
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return nil, err
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}
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offset += n
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}
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d.offset[0] = offset
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d.length = 2
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default:
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i := sym - 271
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d.length = lengthBase[i] + 3
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bits := lengthExtraBits[i]
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if bits > 0 {
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n, err := d.br.readBits(bits)
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if err != nil {
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return nil, err
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}
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d.length += n
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}
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i, err = d.offsetDecoder.readSym(d.br)
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if err != nil {
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return nil, err
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}
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offset := offsetBase[i] + 1
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bits = offsetExtraBits[i]
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switch {
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case bits >= 4:
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if bits > 4 {
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n, err := d.br.readBits(bits - 4)
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if err != nil {
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return nil, err
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}
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offset += n << 4
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}
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if d.lowOffsetRepeats > 0 {
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d.lowOffsetRepeats--
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offset += d.lowOffset
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} else {
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n, err := d.lowOffsetDecoder.readSym(d.br)
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if err != nil {
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return nil, err
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}
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if n == 16 {
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d.lowOffsetRepeats = 15
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offset += d.lowOffset
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} else {
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offset += n
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d.lowOffset = n
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}
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}
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case bits > 0:
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n, err := d.br.readBits(bits)
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if err != nil {
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return nil, err
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}
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offset += n
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}
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if offset >= 0x2000 {
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d.length++
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if offset >= 0x40000 {
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d.length++
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}
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}
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copy(d.offset[1:], d.offset[:])
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d.offset[0] = offset
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}
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win.copyBytes(d.length, d.offset[0])
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return nil, nil
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}
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