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reader.go
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reader.go
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package buf
import (
"io"
"v2ray.com/core/common/errors"
)
// BytesToBufferReader is a Reader that adjusts its reading speed automatically.
type BytesToBufferReader struct {
reader io.Reader
buffer *Buffer
}
// Read implements Reader.Read().
func (r *BytesToBufferReader) Read() (MultiBuffer, error) {
if err := r.buffer.Reset(ReadFrom(r.reader)); err != nil {
return nil, err
}
mb := NewMultiBuffer()
for !r.buffer.IsEmpty() {
b := New()
b.AppendSupplier(ReadFrom(r.buffer))
mb.Append(b)
}
return mb, nil
}
type readerAdpater struct {
MultiBufferReader
}
func (r *readerAdpater) Read() (MultiBuffer, error) {
return r.ReadMultiBuffer()
}
type bufferToBytesReader struct {
stream Reader
current MultiBuffer
err error
}
// fill fills in the internal buffer.
func (r *bufferToBytesReader) fill() {
b, err := r.stream.Read()
if err != nil {
r.err = err
return
}
r.current = b
}
func (r *bufferToBytesReader) Read(b []byte) (int, error) {
if r.err != nil {
return 0, r.err
}
if r.current == nil {
r.fill()
if r.err != nil {
return 0, r.err
}
}
nBytes, err := r.current.Read(b)
if r.current.IsEmpty() {
r.current.Release()
r.current = nil
}
return nBytes, err
}
func (r *bufferToBytesReader) ReadMultiBuffer() (MultiBuffer, error) {
if r.err != nil {
return nil, r.err
}
if r.current == nil {
r.fill()
if r.err != nil {
return nil, r.err
}
}
b := r.current
r.current = nil
return b, nil
}
func (r *bufferToBytesReader) writeToInternal(writer io.Writer) (int64, error) {
if r.err != nil {
return 0, r.err
}
mbWriter := NewWriter(writer)
totalBytes := int64(0)
for {
if r.current == nil {
r.fill()
if r.err != nil {
return totalBytes, r.err
}
}
totalBytes += int64(r.current.Len())
if err := mbWriter.Write(r.current); err != nil {
return totalBytes, err
}
r.current = nil
}
}
func (r *bufferToBytesReader) WriteTo(writer io.Writer) (int64, error) {
nBytes, err := r.writeToInternal(writer)
if errors.Cause(err) == io.EOF {
return nBytes, nil
}
return nBytes, err
}