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common.go
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common.go
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package tlv
import (
"bufio"
"fmt"
"io"
)
const maxBytesSize = 1024 * 1024
func writeBytes(bw *bufio.Writer, b, header []byte) error {
size := len(b)
if size > maxBytesSize {
return fmt.Errorf("too big size=%d. Must not exceed %d", size, maxBytesSize)
}
appendUint32(header[:0], uint32(size))
_, err := bw.Write(header)
if err != nil {
return fmt.Errorf("cannot write header: %s", err)
}
_, err = bw.Write(b)
if err != nil {
return fmt.Errorf("cannot write body with size %d: %s", size, err)
}
return nil
}
func readBytes(br *bufio.Reader, b, header []byte) ([]byte, error) {
_, err := io.ReadFull(br, header)
if err != nil {
return b, fmt.Errorf("cannot read header: %s", err)
}
size := int(bytes2Uint32(header))
if size > maxBytesSize {
return b, fmt.Errorf("too big size=%d. Must not exceed %d", size, maxBytesSize)
}
if cap(b) < size {
b = make([]byte, size)
}
b = b[:size]
_, err = io.ReadFull(br, b)
if err != nil {
return b, fmt.Errorf("cannot read body with size %d: %s", size, err)
}
return b, nil
}
func appendUint32(b []byte, n uint32) []byte {
return append(b, byte(n), byte(n>>8), byte(n>>16), byte(n>>24))
}
func bytes2Uint32(b []byte) uint32 {
return (uint32(b[3]) << 24) | (uint32(b[2]) << 16) | (uint32(b[1]) << 8) | uint32(b[0])
}