Method WriteTaggedInt64

go/fory/buffer.go:1064–1079

WriteTaggedInt64 writes int64 using tagged encoding. If value is in [-1073741824, 1073741823], encode as 4 bytes: ((value as i32) << 1). Otherwise write as 9 bytes: 0b1 | little-endian 8 bytes i64.

(value int64)

// If value is in [-1073741824, 1073741823], encode as 4 bytes: ((value as i32) << 1).
// Otherwise write as 9 bytes: 0b1 | little-endian 8 bytes i64.
func (b *ByteBuffer) WriteTaggedInt64(value int64) {
	const halfMinIntValue int64 = -1073741824 // INT32_MIN / 2
	const halfMaxIntValue int64 = 1073741823  // INT32_MAX / 2
	if value >= halfMinIntValue && value <= halfMaxIntValue {
		b.WriteInt32(int32(value) << 1)
	} else {
		b.grow(9)
		b.data[b.writerIndex] = 0b1
		if isLittleEndian {
			*(*int64)(unsafe.Pointer(&b.data[b.writerIndex+1])) = value
		} else {
			binary.LittleEndian.PutUint64(b.data[b.writerIndex+1:], uint64(value))
		}
		b.writerIndex += 9
	}
}

// ReadTaggedInt64 reads int64 using tagged encoding.
// If bit 0 is 0, return value >> 1 (arithmetic shift).