mirror of https://github.com/v2ray/v2ray-core
148 lines
2.9 KiB
Go
148 lines
2.9 KiB
Go
package crypto
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import (
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"io"
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"v2ray.com/core/common/buf"
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"v2ray.com/core/common/serial"
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)
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type ChunkSizeDecoder interface {
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SizeBytes() int
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Decode([]byte) (uint16, error)
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}
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type ChunkSizeEncoder interface {
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SizeBytes() int
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Encode(uint16, []byte) []byte
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}
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type PlainChunkSizeParser struct{}
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func (PlainChunkSizeParser) SizeBytes() int {
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return 2
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}
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func (PlainChunkSizeParser) Encode(size uint16, b []byte) []byte {
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return serial.Uint16ToBytes(size, b)
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}
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func (PlainChunkSizeParser) Decode(b []byte) (uint16, error) {
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return serial.BytesToUint16(b), nil
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}
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type ChunkStreamReader struct {
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sizeDecoder ChunkSizeDecoder
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reader buf.Reader
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buffer []byte
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leftOver buf.MultiBuffer
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leftOverSize int
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}
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func NewChunkStreamReader(sizeDecoder ChunkSizeDecoder, reader io.Reader) *ChunkStreamReader {
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return &ChunkStreamReader{
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sizeDecoder: sizeDecoder,
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reader: buf.NewReader(reader),
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buffer: make([]byte, sizeDecoder.SizeBytes()),
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}
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}
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func (r *ChunkStreamReader) readAtLeast(size int) error {
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mb := r.leftOver
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r.leftOver = nil
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for mb.Len() < size {
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extra, err := r.reader.Read()
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if err != nil {
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mb.Release()
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return err
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}
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mb.AppendMulti(extra)
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}
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r.leftOver = mb
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return nil
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}
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func (r *ChunkStreamReader) readSize() (uint16, error) {
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if r.sizeDecoder.SizeBytes() > r.leftOver.Len() {
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if err := r.readAtLeast(r.sizeDecoder.SizeBytes() - r.leftOver.Len()); err != nil {
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return 0, err
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}
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}
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r.leftOver.Read(r.buffer)
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return r.sizeDecoder.Decode(r.buffer)
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}
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func (r *ChunkStreamReader) Read() (buf.MultiBuffer, error) {
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size := r.leftOverSize
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if size == 0 {
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nextSize, err := r.readSize()
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if err != nil {
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return nil, err
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}
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if nextSize == 0 {
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return nil, io.EOF
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}
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size = int(nextSize)
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}
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if r.leftOver.IsEmpty() {
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if err := r.readAtLeast(1); err != nil {
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return nil, err
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}
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}
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if size >= r.leftOver.Len() {
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mb := r.leftOver
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r.leftOverSize = size - r.leftOver.Len()
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r.leftOver = nil
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return mb, nil
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}
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mb := r.leftOver.SliceBySize(size)
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if mb.Len() != size {
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b := buf.New()
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b.AppendSupplier(buf.ReadFullFrom(&r.leftOver, size-mb.Len()))
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mb.Append(b)
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}
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r.leftOverSize = 0
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return mb, nil
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}
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type ChunkStreamWriter struct {
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sizeEncoder ChunkSizeEncoder
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writer buf.Writer
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}
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func NewChunkStreamWriter(sizeEncoder ChunkSizeEncoder, writer io.Writer) *ChunkStreamWriter {
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return &ChunkStreamWriter{
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sizeEncoder: sizeEncoder,
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writer: buf.NewWriter(writer),
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}
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}
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func (w *ChunkStreamWriter) Write(mb buf.MultiBuffer) error {
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mb2Write := buf.NewMultiBuffer()
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const sliceSize = 8192
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for {
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slice := mb.SliceBySize(sliceSize)
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b := buf.New()
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b.AppendSupplier(func(buffer []byte) (int, error) {
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w.sizeEncoder.Encode(uint16(slice.Len()), buffer[:0])
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return w.sizeEncoder.SizeBytes(), nil
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})
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mb2Write.Append(b)
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mb2Write.AppendMulti(slice)
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if mb.IsEmpty() {
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break
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}
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}
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return w.writer.Write(mb2Write)
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}
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