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replace WriteUintN and ReadUintN by explicit functions

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This commit is contained in:
Marten Seemann
2019-08-20 15:59:39 +07:00
parent 2133d01956
commit ccb197939d
4 changed files with 92 additions and 70 deletions
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27
internal/utils/byteorder_big_endian.go
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@@ -44,6 +44,22 @@ func (bigEndian) ReadUint32(b io.ByteReader) (uint32, error) {
return uint32(b1) + uint32(b2)<<8 + uint32(b3)<<16 + uint32(b4)<<24, nil
}
// ReadUint24 reads a uint24
func (bigEndian) ReadUint24(b io.ByteReader) (uint32, error) {
var b1, b2, b3 uint8
var err error
if b3, err = b.ReadByte(); err != nil {
return 0, err
}
if b2, err = b.ReadByte(); err != nil {
return 0, err
}
if b1, err = b.ReadByte(); err != nil {
return 0, err
}
return uint32(b1) + uint32(b2)<<8 + uint32(b3)<<16, nil
}
// ReadUint16 reads a uint16
func (bigEndian) ReadUint16(b io.ByteReader) (uint16, error) {
var b1, b2 uint8
@@ -57,17 +73,16 @@ func (bigEndian) ReadUint16(b io.ByteReader) (uint16, error) {
return uint16(b1) + uint16(b2)<<8, nil
}
func (bigEndian) WriteUintN(b *bytes.Buffer, length uint8, i uint64) {
for j := length; j > 0; j-- {
b.WriteByte(uint8(i >> (8 * (j - 1))))
}
}
// WriteUint32 writes a uint32
func (bigEndian) WriteUint32(b *bytes.Buffer, i uint32) {
b.Write([]byte{uint8(i >> 24), uint8(i >> 16), uint8(i >> 8), uint8(i)})
}
// WriteUint24 writes a uint24
func (bigEndian) WriteUint24(b *bytes.Buffer, i uint32) {
b.Write([]byte{uint8(i >> 16), uint8(i >> 8), uint8(i)})
}
// WriteUint16 writes a uint16
func (bigEndian) WriteUint16(b *bytes.Buffer, i uint16) {
b.Write([]byte{uint8(i >> 8), uint8(i)})