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forgejo/vendor/github.com/nwaples/rardecode/decode29_ppm.go
PhilippHomann 684b7a999f
Dump: add output format tar and output to stdout (#10376)
* 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>
2020-06-05 16:47:39 -04:00

132 lines
2.1 KiB
Go
Vendored

package rardecode
import "io"
type ppm29Decoder struct {
m model // ppm model
esc byte // escape character
br io.ByteReader
}
func (d *ppm29Decoder) init(br *rarBitReader) error {
maxOrder, err := br.readBits(7)
if err != nil {
return err
}
reset := maxOrder&0x20 > 0
// Should have flushed all unread bits from bitReader by now,
// use underlying ByteReader
d.br = br.r
var maxMB int
if reset {
c, err := d.br.ReadByte()
if err != nil {
return err
}
maxMB = int(c) + 1
}
if maxOrder&0x40 > 0 {
d.esc, err = d.br.ReadByte()
if err != nil {
return err
}
}
maxOrder = (maxOrder & 0x1f) + 1
if maxOrder > 16 {
maxOrder = 16 + (maxOrder-16)*3
}
return d.m.init(d.br, reset, maxOrder, maxMB)
}
func (d *ppm29Decoder) reset() {
d.esc = 2
}
func (d *ppm29Decoder) readFilterData() ([]byte, error) {
c, err := d.m.ReadByte()
if err != nil {
return nil, err
}
n := int(c&7) + 1
if n == 7 {
b, err := d.m.ReadByte()
if err != nil {
return nil, err
}
n += int(b)
} else if n == 8 {
b, err := d.m.ReadByte()
if err != nil {
return nil, err
}
n = int(b) << 8
b, err = d.m.ReadByte()
if err != nil {
return nil, err
}
n |= int(b)
}
n++
buf := make([]byte, n)
buf[0] = byte(c)
for i := 1; i < n; i++ {
buf[i], err = d.m.ReadByte()
if err != nil {
return nil, err
}
}
return buf, nil
}
func (d *ppm29Decoder) decode(w *window) ([]byte, error) {
c, err := d.m.ReadByte()
if err != nil {
return nil, err
}
if c != d.esc {
w.writeByte(c)
return nil, nil
}
c, err = d.m.ReadByte()
if err != nil {
return nil, err
}
switch c {
case 0:
return nil, endOfBlock
case 2:
return nil, endOfBlockAndFile
case 3:
return d.readFilterData()
case 4:
offset := 0
for i := 0; i < 3; i++ {
c, err = d.m.ReadByte()
if err != nil {
return nil, err
}
offset = offset<<8 | int(c)
}
len, err := d.m.ReadByte()
if err != nil {
return nil, err
}
w.copyBytes(int(len)+32, offset+2)
case 5:
len, err := d.m.ReadByte()
if err != nil {
return nil, err
}
w.copyBytes(int(len)+4, 1)
default:
w.writeByte(d.esc)
}
return nil, nil
}