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reader.go
100 lines (85 loc) · 2 KB
/
reader.go
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package mux
import (
"io"
"v2ray.com/core/common/buf"
"v2ray.com/core/common/serial"
)
// ReadMetadata reads FrameMetadata from the given reader.
func ReadMetadata(reader io.Reader) (*FrameMetadata, error) {
metaLen, err := serial.ReadUint16(reader)
if err != nil {
return nil, err
}
if metaLen > 512 {
return nil, newError("invalid metalen ", metaLen).AtWarning()
}
b := buf.New()
defer b.Release()
if err := b.Reset(buf.ReadFullFrom(reader, int(metaLen))); err != nil {
return nil, err
}
return ReadFrameFrom(b.Bytes())
}
// PacketReader is an io.Reader that reads whole chunk of Mux frames every time.
type PacketReader struct {
reader io.Reader
eof bool
}
// NewPacketReader creates a new PacketReader.
func NewPacketReader(reader io.Reader) *PacketReader {
return &PacketReader{
reader: reader,
eof: false,
}
}
// ReadMultiBuffer implements buf.Reader.
func (r *PacketReader) ReadMultiBuffer() (buf.MultiBuffer, error) {
if r.eof {
return nil, io.EOF
}
size, err := serial.ReadUint16(r.reader)
if err != nil {
return nil, err
}
var b *buf.Buffer
if size <= buf.Size {
b = buf.New()
} else {
b = buf.NewLocal(int(size))
}
if err := b.AppendSupplier(buf.ReadFullFrom(r.reader, int(size))); err != nil {
b.Release()
return nil, err
}
r.eof = true
return buf.NewMultiBufferValue(b), nil
}
// StreamReader reads Mux frame as a stream.
type StreamReader struct {
reader *buf.BufferedReader
leftOver int
}
// NewStreamReader creates a new StreamReader.
func NewStreamReader(reader *buf.BufferedReader) *StreamReader {
return &StreamReader{
reader: reader,
leftOver: -1,
}
}
// ReadMultiBuffer implmenets buf.Reader.
func (r *StreamReader) ReadMultiBuffer() (buf.MultiBuffer, error) {
if r.leftOver == 0 {
r.leftOver = -1
return nil, io.EOF
}
if r.leftOver == -1 {
size, err := serial.ReadUint16(r.reader)
if err != nil {
return nil, err
}
r.leftOver = int(size)
}
mb, err := r.reader.ReadAtMost(r.leftOver)
r.leftOver -= mb.Len()
return mb, err
}