2016-01-29 13:39:55 +00:00
|
|
|
package io // import "github.com/v2ray/v2ray-core/common/io"
|
|
|
|
|
|
|
|
import (
|
|
|
|
"io"
|
|
|
|
|
2016-03-11 22:51:58 +00:00
|
|
|
"github.com/v2ray/v2ray-core/common"
|
2016-01-29 13:39:55 +00:00
|
|
|
"github.com/v2ray/v2ray-core/common/alloc"
|
|
|
|
)
|
|
|
|
|
|
|
|
// ReadFrom reads from a reader and put all content to a buffer.
|
|
|
|
// If buffer is nil, ReadFrom creates a new normal buffer.
|
|
|
|
func ReadFrom(reader io.Reader, buffer *alloc.Buffer) (*alloc.Buffer, error) {
|
|
|
|
if buffer == nil {
|
|
|
|
buffer = alloc.NewBuffer()
|
|
|
|
}
|
|
|
|
nBytes, err := reader.Read(buffer.Value)
|
|
|
|
buffer.Slice(0, nBytes)
|
|
|
|
return buffer, err
|
|
|
|
}
|
|
|
|
|
2016-02-06 21:28:35 +00:00
|
|
|
// Reader extends io.Reader with alloc.Buffer.
|
2016-01-29 13:39:55 +00:00
|
|
|
type Reader interface {
|
2016-04-12 19:43:13 +00:00
|
|
|
common.Releasable
|
2016-02-06 21:28:35 +00:00
|
|
|
// Read reads content from underlying reader, and put it into an alloc.Buffer.
|
2016-01-29 13:39:55 +00:00
|
|
|
Read() (*alloc.Buffer, error)
|
|
|
|
}
|
|
|
|
|
2016-02-06 21:28:35 +00:00
|
|
|
// AdaptiveReader is a Reader that adjusts its reading speed automatically.
|
2016-01-29 13:39:55 +00:00
|
|
|
type AdaptiveReader struct {
|
|
|
|
reader io.Reader
|
|
|
|
allocate func() *alloc.Buffer
|
|
|
|
}
|
|
|
|
|
2016-02-06 21:28:35 +00:00
|
|
|
// NewAdaptiveReader creates a new AdaptiveReader.
|
2016-04-28 20:31:33 +00:00
|
|
|
// The AdaptiveReader instance doesn't take the ownership of reader.
|
2016-01-29 13:39:55 +00:00
|
|
|
func NewAdaptiveReader(reader io.Reader) *AdaptiveReader {
|
|
|
|
return &AdaptiveReader{
|
|
|
|
reader: reader,
|
|
|
|
allocate: alloc.NewBuffer,
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2016-02-06 21:28:35 +00:00
|
|
|
// Read implements Reader.Read().
|
2016-01-29 13:39:55 +00:00
|
|
|
func (this *AdaptiveReader) Read() (*alloc.Buffer, error) {
|
|
|
|
buffer, err := ReadFrom(this.reader, this.allocate())
|
|
|
|
|
2016-05-11 17:54:20 +00:00
|
|
|
if buffer.Len() >= alloc.BufferSize {
|
2016-01-29 13:39:55 +00:00
|
|
|
this.allocate = alloc.NewLargeBuffer
|
2016-05-11 17:54:20 +00:00
|
|
|
} else {
|
2016-01-29 13:39:55 +00:00
|
|
|
this.allocate = alloc.NewBuffer
|
|
|
|
}
|
|
|
|
|
|
|
|
if err != nil {
|
2016-02-01 11:22:29 +00:00
|
|
|
buffer.Release()
|
2016-01-29 13:39:55 +00:00
|
|
|
return nil, err
|
|
|
|
}
|
|
|
|
return buffer, nil
|
|
|
|
}
|
2016-03-11 22:51:58 +00:00
|
|
|
|
|
|
|
func (this *AdaptiveReader) Release() {
|
|
|
|
this.reader = nil
|
|
|
|
}
|