mirror of
https://github.com/v2fly/v2ray-core.git
synced 2024-12-22 18:17:52 -05:00
202 lines
4.3 KiB
Go
202 lines
4.3 KiB
Go
package buf
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import (
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"io"
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"v2ray.com/core/common"
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"v2ray.com/core/common/errors"
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)
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// BytesToBufferReader is a Reader that adjusts its reading speed automatically.
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type BytesToBufferReader struct {
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io.Reader
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buffer []byte
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}
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// NewBytesToBufferReader returns a new BytesToBufferReader.
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func NewBytesToBufferReader(reader io.Reader) Reader {
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return &BytesToBufferReader{
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Reader: reader,
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}
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}
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func (r *BytesToBufferReader) readSmall() (MultiBuffer, error) {
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b := New()
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for i := 0; i < 64; i++ {
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err := b.Reset(ReadFrom(r.Reader))
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if b.IsFull() && largeSize > Size {
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r.buffer = newBytes(Size + 1)
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}
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if !b.IsEmpty() {
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return NewMultiBufferValue(b), nil
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}
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if err != nil {
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b.Release()
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return nil, err
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}
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}
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return nil, newError("Reader returns too many empty payloads.")
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}
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func (r *BytesToBufferReader) freeBuffer() {
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freeBytes(r.buffer)
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r.buffer = nil
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}
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// ReadMultiBuffer implements Reader.
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func (r *BytesToBufferReader) ReadMultiBuffer() (MultiBuffer, error) {
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if r.buffer == nil || largeSize == Size {
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return r.readSmall()
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}
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nBytes, err := r.Reader.Read(r.buffer)
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if nBytes > 0 {
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mb := NewMultiBufferCap(int32(nBytes/Size) + 1)
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common.Must2(mb.Write(r.buffer[:nBytes]))
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if nBytes == len(r.buffer) && nBytes < int(largeSize) {
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freeBytes(r.buffer)
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r.buffer = newBytes(int32(nBytes) + 1)
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} else if nBytes < Size {
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r.freeBuffer()
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}
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return mb, nil
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}
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r.freeBuffer()
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if err != nil {
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return nil, err
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}
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// Read() returns empty payload and nil err. We don't expect this to happen, but just in case.
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return r.readSmall()
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}
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// BufferedReader is a Reader that keeps its internal buffer.
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type BufferedReader struct {
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stream Reader
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leftOver MultiBuffer
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buffered bool
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}
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// NewBufferedReader returns a new BufferedReader.
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func NewBufferedReader(reader Reader) *BufferedReader {
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return &BufferedReader{
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stream: reader,
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buffered: true,
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}
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}
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// SetBuffered sets whether to keep the interal buffer.
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func (r *BufferedReader) SetBuffered(f bool) {
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r.buffered = f
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}
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// IsBuffered returns true if internal buffer is used.
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func (r *BufferedReader) IsBuffered() bool {
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return r.buffered
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}
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// BufferedBytes returns the number of bytes that is cached in this reader.
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func (r *BufferedReader) BufferedBytes() int32 {
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return r.leftOver.Len()
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}
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// ReadByte implements io.ByteReader.
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func (r *BufferedReader) ReadByte() (byte, error) {
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var b [1]byte
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_, err := r.Read(b[:])
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return b[0], err
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}
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// Read implements io.Reader. It reads from internal buffer first (if available) and then reads from the underlying reader.
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func (r *BufferedReader) Read(b []byte) (int, error) {
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if r.leftOver != nil {
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nBytes, _ := r.leftOver.Read(b)
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if r.leftOver.IsEmpty() {
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r.leftOver.Release()
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r.leftOver = nil
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}
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return nBytes, nil
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}
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if !r.buffered {
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if reader, ok := r.stream.(io.Reader); ok {
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return reader.Read(b)
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}
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}
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mb, err := r.stream.ReadMultiBuffer()
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if mb != nil {
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nBytes, _ := mb.Read(b)
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if !mb.IsEmpty() {
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r.leftOver = mb
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}
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return nBytes, err
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}
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return 0, err
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}
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// ReadMultiBuffer implements Reader.
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func (r *BufferedReader) ReadMultiBuffer() (MultiBuffer, error) {
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if r.leftOver != nil {
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mb := r.leftOver
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r.leftOver = nil
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return mb, nil
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}
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return r.stream.ReadMultiBuffer()
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}
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// ReadAtMost returns a MultiBuffer with at most size.
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func (r *BufferedReader) ReadAtMost(size int32) (MultiBuffer, error) {
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if r.leftOver == nil {
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mb, err := r.stream.ReadMultiBuffer()
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if mb.IsEmpty() && err != nil {
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return nil, err
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}
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r.leftOver = mb
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}
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mb := r.leftOver.SliceBySize(size)
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if r.leftOver.IsEmpty() {
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r.leftOver = nil
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}
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return mb, nil
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}
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func (r *BufferedReader) writeToInternal(writer io.Writer) (int64, error) {
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mbWriter := NewWriter(writer)
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totalBytes := int64(0)
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if r.leftOver != nil {
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totalBytes += int64(r.leftOver.Len())
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if err := mbWriter.WriteMultiBuffer(r.leftOver); err != nil {
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return 0, err
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}
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r.leftOver = nil
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}
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for {
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mb, err := r.stream.ReadMultiBuffer()
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if mb != nil {
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totalBytes += int64(mb.Len())
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if werr := mbWriter.WriteMultiBuffer(mb); werr != nil {
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return totalBytes, err
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}
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}
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if err != nil {
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return totalBytes, err
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}
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}
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}
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// WriteTo implements io.WriterTo.
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func (r *BufferedReader) WriteTo(writer io.Writer) (int64, error) {
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nBytes, err := r.writeToInternal(writer)
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if errors.Cause(err) == io.EOF {
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return nBytes, nil
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}
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return nBytes, err
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}
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