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v2fly/common/buf/io.go

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package buf
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import (
"io"
"v2ray.com/core/common/errors"
)
// Reader extends io.Reader with alloc.Buffer.
type Reader interface {
// Read reads content from underlying reader, and put it into an alloc.Buffer.
Read() (*Buffer, error)
}
// Writer extends io.Writer with alloc.Buffer.
type Writer interface {
// Write writes an alloc.Buffer into underlying writer.
Write(*Buffer) error
}
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// ReadFrom creates a Supplier to read from a given io.Reader.
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func ReadFrom(reader io.Reader) Supplier {
return func(b []byte) (int, error) {
return reader.Read(b)
}
}
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// ReadFullFrom creates a Supplier to read full buffer from a given io.Reader.
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func ReadFullFrom(reader io.Reader, size int) Supplier {
return func(b []byte) (int, error) {
return io.ReadFull(reader, b[:size])
}
}
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// Pipe dumps all content from reader to writer, until an error happens.
func Pipe(reader Reader, writer Writer) error {
for {
buffer, err := reader.Read()
if err != nil {
return err
}
if buffer.IsEmpty() {
buffer.Release()
continue
}
err = writer.Write(buffer)
if err != nil {
buffer.Release()
return err
}
}
}
// PipeUntilEOF behaves the same as Pipe(). The only difference is PipeUntilEOF returns nil on EOF.
func PipeUntilEOF(reader Reader, writer Writer) error {
err := Pipe(reader, writer)
if err != nil && errors.Cause(err) != io.EOF {
return err
}
return nil
}
// NewReader creates a new Reader.
// The Reader instance doesn't take the ownership of reader.
func NewReader(reader io.Reader) Reader {
return &BytesToBufferReader{
reader: reader,
}
}
func NewBytesReader(stream Reader) *BufferToBytesReader {
return &BufferToBytesReader{
stream: stream,
}
}
// NewWriter creates a new Writer.
func NewWriter(writer io.Writer) Writer {
return &BufferToBytesWriter{
writer: writer,
}
}
func NewBytesWriter(writer Writer) *BytesToBufferWriter {
return &BytesToBufferWriter{
writer: writer,
}
}