111 lines
1.6 KiB
Go
111 lines
1.6 KiB
Go
package xdr
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import "io"
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func pad(l int) int {
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d := l % 4
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if d == 0 {
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return 0
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}
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return 4 - d
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}
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var padBytes = []byte{0, 0, 0}
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type Writer struct {
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w io.Writer
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tot int
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err error
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b [8]byte
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}
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func NewWriter(w io.Writer) *Writer {
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return &Writer{
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w: w,
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}
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}
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func (w *Writer) WriteString(s string) (int, error) {
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return w.WriteBytes([]byte(s))
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}
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func (w *Writer) WriteBytes(bs []byte) (int, error) {
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if w.err != nil {
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return 0, w.err
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}
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w.WriteUint32(uint32(len(bs)))
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if w.err != nil {
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return 0, w.err
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}
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var l, n int
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n, w.err = w.w.Write(bs)
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l += n
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if p := pad(len(bs)); w.err == nil && p > 0 {
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n, w.err = w.w.Write(padBytes[:p])
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l += n
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}
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w.tot += l
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return l, w.err
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}
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func (w *Writer) WriteUint16(v uint16) (int, error) {
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if w.err != nil {
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return 0, w.err
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}
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w.b[0] = byte(v >> 8)
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w.b[1] = byte(v)
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w.b[2] = 0
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w.b[3] = 0
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var l int
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l, w.err = w.w.Write(w.b[:4])
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w.tot += l
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return l, w.err
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}
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func (w *Writer) WriteUint32(v uint32) (int, error) {
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if w.err != nil {
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return 0, w.err
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}
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w.b[0] = byte(v >> 24)
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w.b[1] = byte(v >> 16)
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w.b[2] = byte(v >> 8)
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w.b[3] = byte(v)
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var l int
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l, w.err = w.w.Write(w.b[:4])
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w.tot += l
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return l, w.err
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}
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func (w *Writer) WriteUint64(v uint64) (int, error) {
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if w.err != nil {
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return 0, w.err
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}
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w.b[0] = byte(v >> 56)
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w.b[1] = byte(v >> 48)
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w.b[2] = byte(v >> 40)
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w.b[3] = byte(v >> 32)
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w.b[4] = byte(v >> 24)
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w.b[5] = byte(v >> 16)
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w.b[6] = byte(v >> 8)
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w.b[7] = byte(v)
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var l int
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l, w.err = w.w.Write(w.b[:8])
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w.tot += l
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return l, w.err
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}
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func (w *Writer) Tot() int {
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return w.tot
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}
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func (w *Writer) Error() error {
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return w.err
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}
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