mirror of
https://github.com/v2fly/v2ray-core.git
synced 2024-12-22 18:17:52 -05:00
63 lines
1.5 KiB
Go
63 lines
1.5 KiB
Go
package io // import "github.com/v2ray/v2ray-core/common/io"
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import (
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"io"
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"github.com/v2ray/v2ray-core/common"
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"github.com/v2ray/v2ray-core/common/alloc"
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)
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// ReadFrom reads from a reader and put all content to a buffer.
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// If buffer is nil, ReadFrom creates a new normal buffer.
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func ReadFrom(reader io.Reader, buffer *alloc.Buffer) (*alloc.Buffer, error) {
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if buffer == nil {
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buffer = alloc.NewBuffer()
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}
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nBytes, err := reader.Read(buffer.Value)
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buffer.Slice(0, nBytes)
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return buffer, err
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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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allocate func() *alloc.Buffer
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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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allocate: alloc.NewBuffer,
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}
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}
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// Read implements Reader.Read().
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func (this *AdaptiveReader) Read() (*alloc.Buffer, error) {
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buffer, err := ReadFrom(this.reader, this.allocate())
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if buffer.Len() >= alloc.BufferSize {
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this.allocate = alloc.NewLargeBuffer
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} else {
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this.allocate = alloc.NewBuffer
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}
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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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return buffer, nil
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}
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func (this *AdaptiveReader) Release() {
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this.reader = nil
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}
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