mirror of
https://github.com/v2fly/v2ray-core.git
synced 2024-12-22 10:08:15 -05:00
144 lines
3.0 KiB
Go
144 lines
3.0 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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func readOne(r io.Reader) (*Buffer, error) {
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b := New()
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for i := 0; i < 64; i++ {
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_, err := b.ReadFrom(r)
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if !b.IsEmpty() {
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return 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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// BufferedReader is a Reader that keeps its internal buffer.
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type BufferedReader struct {
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// Reader is the underlying reader to be read from
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Reader Reader
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// Buffer is the internal buffer to be read from first
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Buffer MultiBuffer
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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.Buffer.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.Buffer.IsEmpty() {
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buffer, nBytes := SplitBytes(r.Buffer, b)
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r.Buffer = buffer
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if r.Buffer.IsEmpty() {
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r.Buffer = nil
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}
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return nBytes, nil
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}
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mb, err := r.Reader.ReadMultiBuffer()
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if err != nil {
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return 0, err
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}
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mb, nBytes := SplitBytes(mb, b)
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if !mb.IsEmpty() {
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r.Buffer = mb
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}
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return nBytes, nil
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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.Buffer.IsEmpty() {
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mb := r.Buffer
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r.Buffer = nil
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return mb, nil
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}
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return r.Reader.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.Buffer.IsEmpty() {
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mb, err := r.Reader.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.Buffer = mb
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}
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rb, mb := SplitSize(r.Buffer, size)
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r.Buffer = rb
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if r.Buffer.IsEmpty() {
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r.Buffer = 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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var sc SizeCounter
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if r.Buffer != nil {
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sc.Size = int64(r.Buffer.Len())
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if err := mbWriter.WriteMultiBuffer(r.Buffer); err != nil {
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return 0, err
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}
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r.Buffer = nil
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}
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err := Copy(r.Reader, mbWriter, CountSize(&sc))
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return sc.Size, err
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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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// Close implements io.Closer.
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func (r *BufferedReader) Close() error {
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if !r.Buffer.IsEmpty() {
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ReleaseMulti(r.Buffer)
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r.Buffer = nil
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}
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return common.Close(r.Reader)
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}
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// SingleReader is a Reader that read one Buffer every time.
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type SingleReader struct {
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io.Reader
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}
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// ReadMultiBuffer implements Reader.
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func (r *SingleReader) ReadMultiBuffer() (MultiBuffer, error) {
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b, err := readOne(r.Reader)
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if err != nil {
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return nil, err
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}
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return MultiBuffer{b}, nil
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}
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