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read_writer.go
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read_writer.go
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package core
import (
"bufio"
"io"
)
type ReadWriter struct {
*bufio.ReadWriter
readError error
writeError error
}
func NewReadWriter(rw io.ReadWriter, bufSize int) *ReadWriter {
return &ReadWriter{
ReadWriter: bufio.NewReadWriter(bufio.NewReaderSize(rw, bufSize), bufio.NewWriterSize(rw, bufSize)),
}
}
func (rw *ReadWriter) Read(p []byte) (int, error) {
if rw.readError != nil {
return 0, rw.readError
}
n, err := io.ReadAtLeast(rw.ReadWriter, p, len(p))
rw.readError = err
return n, err
}
func (rw *ReadWriter) ReadError() error {
return rw.readError
}
func (rw *ReadWriter) ReadUintBE(n int) (uint32, error) {
if rw.readError != nil {
return 0, rw.readError
}
ret := uint32(0)
for i := 0; i < n; i++ {
b, err := rw.ReadByte()
if err != nil {
rw.readError = err
return 0, err
}
ret = ret<<8 + uint32(b)
}
return ret, nil
}
func (rw *ReadWriter) ReadUintLE(n int) (uint32, error) {
if rw.readError != nil {
return 0, rw.readError
}
ret := uint32(0)
for i := 0; i < n; i++ {
b, err := rw.ReadByte()
if err != nil {
rw.readError = err
return 0, err
}
ret += uint32(b) << uint32(i*8)
}
return ret, nil
}
func (rw *ReadWriter) Flush() error {
if rw.writeError != nil {
return rw.writeError
}
if rw.ReadWriter.Writer.Buffered() == 0 {
return nil
}
return rw.ReadWriter.Flush()
}
func (rw *ReadWriter) Write(p []byte) (int, error) {
if rw.writeError != nil {
return 0, rw.writeError
}
return rw.ReadWriter.Write(p)
}
func (rw *ReadWriter) WriteError() error {
return rw.writeError
}
func (rw *ReadWriter) WriteUintBE(v uint32, n int) error {
if rw.writeError != nil {
return rw.writeError
}
for i := 0; i < n; i++ {
b := byte(v>>uint32((n-i-1)<<3)) & 0xff
if err := rw.WriteByte(b); err != nil {
rw.writeError = err
return err
}
}
return nil
}
func (rw *ReadWriter) WriteUintLE(v uint32, n int) error {
if rw.writeError != nil {
return rw.writeError
}
for i := 0; i < n; i++ {
b := byte(v) & 0xff
if err := rw.WriteByte(b); err != nil {
rw.writeError = err
return err
}
v = v >> 8
}
return nil
}