mtsatellite/common/bigendianreader.go
2024-01-07 15:31:42 +01:00

81 lines
1.5 KiB
Go

// Copyright 2024 by Sascha L. Teichmann
// Use of this source code is governed by the MIT license
// that can be found in the LICENSE file.
package common
import (
"encoding/binary"
"io"
)
type bigEndianReader struct {
parent io.Reader
buf [4]byte
err error
}
func (ber *bigEndianReader) u8() (uint8, error) {
if ber.err != nil {
return 0, ber.err
}
_, err := io.ReadFull(ber.parent, ber.buf[:1])
if err != nil {
ber.err = err
return 0, err
}
return ber.buf[0], nil
}
func (ber *bigEndianReader) u16() (uint16, error) {
if ber.err != nil {
return 0, ber.err
}
two := ber.buf[:2]
_, err := io.ReadFull(ber.parent, two)
if err != nil {
ber.err = err
return 0, err
}
return binary.BigEndian.Uint16(two), nil
}
func (ber *bigEndianReader) u32() (uint32, error) {
if ber.err != nil {
return 0, ber.err
}
four := ber.buf[:2]
_, err := io.ReadFull(ber.parent, four)
if err != nil {
ber.err = err
return 0, err
}
return binary.BigEndian.Uint32(four), nil
}
func (ber *bigEndianReader) str(n int) (string, error) {
if ber.err != nil {
return "", ber.err
}
buf := make([]byte, n)
_, err := io.ReadFull(ber.parent, buf)
if err != nil {
ber.err = err
return "", err
}
return string(buf), nil
}
func (ber *bigEndianReader) full(n int) ([]byte, error) {
if ber.err != nil {
return nil, ber.err
}
buf := make([]byte, n)
_, err := io.ReadFull(ber.parent, buf)
if err != nil {
ber.err = err
return nil, err
}
return buf, nil
}