71 lines
1.9 KiB
Go
71 lines
1.9 KiB
Go
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package protocol
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import "io"
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import "fmt"
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// ReadBuf reads a size-prefixed buffer.
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func ReadBuf (sizeBytes int, reader io.Reader) (buf []byte, err error) {
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size, err := ReadInt(reader, sizeBytes)
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if err != nil { return nil, err }
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buf = make([]byte, size)
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_, err = io.ReadFull(reader, buf)
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return buf, err
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}
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// ReadBuf8 reads a size-prefixed buffer with an 8-bit size.
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func ReadBuf8 (reader io.Reader) (buf []byte, err error) {
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return ReadBuf(1, reader)
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}
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// ReadBuf16 reads a size-prefixed buffer with a 16-bit size.
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func ReadBuf16 (reader io.Reader) (buf []byte, err error) {
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return ReadBuf(2, reader)
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}
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// ReadString reads a size-prefixed string.
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func ReadString (sizeBytes int, reader io.Reader) (str string, err error) {
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buf, err := ReadBuf(sizeBytes, reader)
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return string(buf), err
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}
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// ReadString8 reads a size-prefixed string with an 8-bit size.
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func ReadString8 (reader io.Reader) (str string, err error) {
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return ReadString(1, reader)
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}
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// ReadString16 reads a size-prefixed string with a 16-bit size.
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func ReadString16 (reader io.Reader) (str string, err error) {
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return ReadString(2, reader)
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}
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func WriteBuf (writer io.Writer, sizeBytes int, buf []byte) (err error) {
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if uint(len(buf)) > MaxIntOfSize(sizeBytes) {
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panic(fmt.Sprintf("len %d cannot fit in U%d", len(buf), sizeBytes * 8))
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}
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err = WriteInt(writer, sizeBytes, uint(len(buf)))
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if err != nil { return }
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_, err = writer.Write(buf)
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return
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}
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func WriteBuf8 (writer io.Writer, buf []byte) error {
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return WriteBuf(writer, 1, buf)
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}
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func WriteBuf16 (writer io.Writer, buf []byte) error {
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return WriteBuf(writer, 2, buf)
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}
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func WriteString (writer io.Writer, sizeBytes int, str string) (err error) {
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return WriteBuf(writer, sizeBytes, []byte(str))
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}
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func WriteString8 (writer io.Writer, str string) (err error) {
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return WriteBuf8(writer, []byte(str))
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}
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func WriteString16 (writer io.Writer, str string) (err error) {
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return WriteBuf16(writer, []byte(str))
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}
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