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70 lines
1.4 KiB
70 lines
1.4 KiB
package io
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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/alloc"
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)
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// Reader extends io.Reader with alloc.Buffer.
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type Reader interface {
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common.Releasable
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// Read reads content from underlying reader, and put it into an alloc.Buffer.
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Read() (*alloc.Buffer, error)
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}
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// AdaptiveReader is a Reader that adjusts its reading speed automatically.
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type AdaptiveReader struct {
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reader io.Reader
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largeBuffer *alloc.Buffer
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highVolumn bool
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}
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// NewAdaptiveReader creates a new AdaptiveReader.
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// The AdaptiveReader instance doesn't take the ownership of reader.
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func NewAdaptiveReader(reader io.Reader) *AdaptiveReader {
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return &AdaptiveReader{
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reader: reader,
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}
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}
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// Read implements Reader.Read().
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func (v *AdaptiveReader) Read() (*alloc.Buffer, error) {
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if v.highVolumn && v.largeBuffer.IsEmpty() {
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if v.largeBuffer == nil {
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v.largeBuffer = alloc.NewLocalBuffer(32 * 1024)
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}
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nBytes, err := v.largeBuffer.FillFrom(v.reader)
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if err != nil {
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return nil, err
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}
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if nBytes < alloc.BufferSize {
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v.highVolumn = false
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}
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}
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buffer := alloc.NewBuffer()
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if !v.largeBuffer.IsEmpty() {
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buffer.FillFrom(v.largeBuffer)
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return buffer, nil
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}
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_, err := buffer.FillFrom(v.reader)
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if err != nil {
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buffer.Release()
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return nil, err
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}
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if buffer.IsFull() {
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v.highVolumn = true
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}
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return buffer, nil
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}
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// Release implements Releasable.Release().
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func (v *AdaptiveReader) Release() {
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v.reader = nil
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}
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