Method ReadTaggedInt64

go/fory/buffer.go:1084–1113

ReadTaggedInt64 reads int64 using tagged encoding. If bit 0 is 0, return value >> 1 (arithmetic shift). Otherwise, skip flag byte and read 8 bytes as int64.

(err *Error)

// If bit 0 is 0, return value >> 1 (arithmetic shift).
// Otherwise, skip flag byte and read 8 bytes as int64.
func (b *ByteBuffer) ReadTaggedInt64(err *Error) int64 {
	if b.readerIndex+4 > len(b.data) {
		if !b.fill(4, err) {
			return 0
		}
	}
	var i int32
	if isLittleEndian {
		i = *(*int32)(unsafe.Pointer(&b.data[b.readerIndex]))
	} else {
		i = int32(binary.LittleEndian.Uint32(b.data[b.readerIndex:]))
	}
	if (i & 0b1) != 0b1 {
		b.readerIndex += 4
		return int64(i >> 1) // arithmetic right shift
	}
	if b.readerIndex+9 > len(b.data) {
		if !b.fill(9, err) {
			return 0
		}
	}
	var value int64
	if isLittleEndian {
		value = *(*int64)(unsafe.Pointer(&b.data[b.readerIndex+1]))
	} else {
		value = int64(binary.LittleEndian.Uint64(b.data[b.readerIndex+1:]))
	}
	b.readerIndex += 9
	return value
}

// WriteTaggedUint64 writes uint64 using tagged encoding.
// If value is in [0, 0x7fffffff], encode as 4 bytes: ((value as u32) << 1).