github.com/xmplusdev/xray-core@v1.8.10/common/mux/reader.go (about)

     1  package mux
     2  
     3  import (
     4  	"io"
     5  
     6  	"github.com/xmplusdev/xray-core/common/buf"
     7  	"github.com/xmplusdev/xray-core/common/crypto"
     8  	"github.com/xmplusdev/xray-core/common/net"
     9  	"github.com/xmplusdev/xray-core/common/serial"
    10  )
    11  
    12  // PacketReader is an io.Reader that reads whole chunk of Mux frames every time.
    13  type PacketReader struct {
    14  	reader io.Reader
    15  	eof    bool
    16  	dest   *net.Destination
    17  }
    18  
    19  // NewPacketReader creates a new PacketReader.
    20  func NewPacketReader(reader io.Reader, dest *net.Destination) *PacketReader {
    21  	return &PacketReader{
    22  		reader: reader,
    23  		eof:    false,
    24  		dest:   dest,
    25  	}
    26  }
    27  
    28  // ReadMultiBuffer implements buf.Reader.
    29  func (r *PacketReader) ReadMultiBuffer() (buf.MultiBuffer, error) {
    30  	if r.eof {
    31  		return nil, io.EOF
    32  	}
    33  
    34  	size, err := serial.ReadUint16(r.reader)
    35  	if err != nil {
    36  		return nil, err
    37  	}
    38  
    39  	if size > buf.Size {
    40  		return nil, newError("packet size too large: ", size)
    41  	}
    42  
    43  	b := buf.New()
    44  	if _, err := b.ReadFullFrom(r.reader, int32(size)); err != nil {
    45  		b.Release()
    46  		return nil, err
    47  	}
    48  	r.eof = true
    49  	if r.dest != nil && r.dest.Network == net.Network_UDP {
    50  		b.UDP = r.dest
    51  	}
    52  	return buf.MultiBuffer{b}, nil
    53  }
    54  
    55  // NewStreamReader creates a new StreamReader.
    56  func NewStreamReader(reader *buf.BufferedReader) buf.Reader {
    57  	return crypto.NewChunkStreamReaderWithChunkCount(crypto.PlainChunkSizeParser{}, reader, 1)
    58  }