53 lines
998 B
Go
53 lines
998 B
Go
package libolmpickle
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import (
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"bytes"
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"encoding/binary"
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"fmt"
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)
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func isZeroByteSlice(data []byte) bool {
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for _, b := range data {
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if b != 0 {
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return false
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}
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}
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return true
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}
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type Decoder struct {
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buf bytes.Buffer
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}
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func NewDecoder(buf []byte) *Decoder {
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return &Decoder{buf: *bytes.NewBuffer(buf)}
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}
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func (d *Decoder) ReadUInt8() (uint8, error) {
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return d.buf.ReadByte()
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}
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func (d *Decoder) ReadBool() (bool, error) {
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val, err := d.buf.ReadByte()
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return val != 0x00, err
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}
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func (d *Decoder) ReadBytes(length int) (data []byte, err error) {
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data = d.buf.Next(length)
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if len(data) != length {
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return nil, fmt.Errorf("only %d in buffer, expected %d", len(data), length)
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} else if isZeroByteSlice(data) {
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return nil, nil
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}
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return
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}
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func (d *Decoder) ReadUInt32() (uint32, error) {
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data := d.buf.Next(4)
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if len(data) != 4 {
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return 0, fmt.Errorf("only %d bytes is buffer, expected 4 for uint32", len(data))
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} else {
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return binary.BigEndian.Uint32(data), nil
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}
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}
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