v2ray-core/common/buf/buffered_reader.go

55 lines
1.1 KiB
Go

package buf
import (
"io"
)
// BufferedReader is a reader with internal cache.
type BufferedReader struct {
reader io.Reader
buffer *Buffer
buffered bool
}
// NewBufferedReader creates a new BufferedReader based on an io.Reader.
func NewBufferedReader(rawReader io.Reader) *BufferedReader {
return &BufferedReader{
reader: rawReader,
buffer: NewLocal(1024),
buffered: true,
}
}
// IsBuffered returns true if the internal cache is effective.
func (v *BufferedReader) IsBuffered() bool {
return v.buffered
}
// SetBuffered is to enable or disable internal cache. If cache is disabled,
// Read() calls will be delegated to the underlying io.Reader directly.
func (v *BufferedReader) SetBuffered(cached bool) {
v.buffered = cached
}
// Read implements io.Reader.Read().
func (v *BufferedReader) Read(b []byte) (int, error) {
if !v.buffered || v.buffer == nil {
if !v.buffer.IsEmpty() {
return v.buffer.Read(b)
}
return v.reader.Read(b)
}
if v.buffer.IsEmpty() {
err := v.buffer.AppendSupplier(ReadFrom(v.reader))
if err != nil {
return 0, err
}
}
if v.buffer.IsEmpty() {
return 0, nil
}
return v.buffer.Read(b)
}