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tlv/truncated: add non-generic encoders for truncated types

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These encoders can be composed to create composite types without
incurring additional allocations that would be required to pass the
truncated types through the generic interface.
This commit is contained in:
Conner Fromknecht
2019-11-04 14:10:43 -08:00
parent 083b574fd8
commit b3b51923dc
2 changed files with 75 additions and 0 deletions
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27
tlv/truncated.go
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@ -40,6 +40,15 @@ func ETUint16(w io.Writer, val interface{}, buf *[8]byte) error {
return NewTypeForEncodingErr(val, "uint16")
}
// ETUint16T is an Encoder for truncated uint16 values, where leading zeros will
// be omitted. An error is returned if val is not a *uint16.
func ETUint16T(w io.Writer, val uint16, buf *[8]byte) error {
binary.BigEndian.PutUint16(buf[:2], val)
numZeros := numLeadingZeroBytes16(val)
_, err := w.Write(buf[numZeros:2])
return err
}
// DTUint16 is an Decoder for truncated uint16 values, where leading zeros will
// be resurrected. An error is returned if val is not a *uint16.
func DTUint16(r io.Reader, val interface{}, buf *[8]byte, l uint64) error {
@ -92,6 +101,15 @@ func ETUint32(w io.Writer, val interface{}, buf *[8]byte) error {
return NewTypeForEncodingErr(val, "uint32")
}
// ETUint32T is an Encoder for truncated uint32 values, where leading zeros will
// be omitted. An error is returned if val is not a *uint32.
func ETUint32T(w io.Writer, val uint32, buf *[8]byte) error {
binary.BigEndian.PutUint32(buf[:4], val)
numZeros := numLeadingZeroBytes32(val)
_, err := w.Write(buf[numZeros:4])
return err
}
// DTUint32 is an Decoder for truncated uint32 values, where leading zeros will
// be resurrected. An error is returned if val is not a *uint32.
func DTUint32(r io.Reader, val interface{}, buf *[8]byte, l uint64) error {
@ -154,6 +172,15 @@ func ETUint64(w io.Writer, val interface{}, buf *[8]byte) error {
return NewTypeForEncodingErr(val, "uint64")
}
// ETUint64T is an Encoder for truncated uint64 values, where leading zeros will
// be omitted. An error is returned if val is not a *uint64.
func ETUint64T(w io.Writer, val uint64, buf *[8]byte) error {
binary.BigEndian.PutUint64(buf[:], val)
numZeros := numLeadingZeroBytes64(val)
_, err := w.Write(buf[numZeros:])
return err
}
// DTUint64 is an Decoder for truncated uint64 values, where leading zeros will
// be resurrected. An error is returned if val is not a *uint64.
func DTUint64(r io.Reader, val interface{}, buf *[8]byte, l uint64) error {