frostfs-api-go/util/proto/marshal.go
Leonard Lyubich 51e8e318c2 [#233] proto: Implement functions for fixed64 protobuf data type
Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
2020-12-25 16:20:34 +03:00

362 lines
7 KiB
Go

/*
This package contains help functions for stable marshaller. Their usage is
totally optional. One can implement fast stable marshaller without these
runtime function calls.
*/
package proto
import (
"encoding/binary"
"math/bits"
"reflect"
)
type (
stableMarshaller interface {
StableMarshal([]byte) ([]byte, error)
StableSize() int
}
)
func BytesMarshal(field int, buf, v []byte) (int, error) {
if len(v) == 0 {
return 0, nil
}
prefix := field<<3 | 0x2
// buf length check can prevent panic at PutUvarint, but it will make
// marshaller a bit slower.
i := binary.PutUvarint(buf, uint64(prefix))
i += binary.PutUvarint(buf[i:], uint64(len(v)))
i += copy(buf[i:], v)
return i, nil
}
func BytesSize(field int, v []byte) int {
ln := len(v)
if ln == 0 {
return 0
}
prefix := field<<3 | 0x2
return VarUIntSize(uint64(prefix)) + VarUIntSize(uint64(ln)) + ln
}
func StringMarshal(field int, buf []byte, v string) (int, error) {
return BytesMarshal(field, buf, []byte(v))
}
func StringSize(field int, v string) int {
return BytesSize(field, []byte(v))
}
func BoolMarshal(field int, buf []byte, v bool) (int, error) {
if !v {
return 0, nil
}
prefix := field << 3
// buf length check can prevent panic at PutUvarint, but it will make
// marshaller a bit slower.
i := binary.PutUvarint(buf, uint64(prefix))
buf[i] = 0x1
return i + 1, nil
}
func BoolSize(field int, v bool) int {
if !v {
return 0
}
prefix := field << 3
return VarUIntSize(uint64(prefix)) + 1 // bool is always 1 byte long
}
func UInt64Marshal(field int, buf []byte, v uint64) (int, error) {
if v == 0 {
return 0, nil
}
prefix := field << 3
// buf length check can prevent panic at PutUvarint, but it will make
// marshaller a bit slower.
i := binary.PutUvarint(buf, uint64(prefix))
i += binary.PutUvarint(buf[i:], v)
return i, nil
}
func UInt64Size(field int, v uint64) int {
if v == 0 {
return 0
}
prefix := field << 3
return VarUIntSize(uint64(prefix)) + VarUIntSize(v)
}
func Int64Marshal(field int, buf []byte, v int64) (int, error) {
return UInt64Marshal(field, buf, uint64(v))
}
func Int64Size(field int, v int64) int {
return UInt64Size(field, uint64(v))
}
func UInt32Marshal(field int, buf []byte, v uint32) (int, error) {
return UInt64Marshal(field, buf, uint64(v))
}
func UInt32Size(field int, v uint32) int {
return UInt64Size(field, uint64(v))
}
func Int32Marshal(field int, buf []byte, v int32) (int, error) {
return UInt64Marshal(field, buf, uint64(v))
}
func Int32Size(field int, v int32) int {
return UInt64Size(field, uint64(v))
}
func EnumMarshal(field int, buf []byte, v int32) (int, error) {
return UInt64Marshal(field, buf, uint64(v))
}
func EnumSize(field int, v int32) int {
return UInt64Size(field, uint64(v))
}
func RepeatedBytesMarshal(field int, buf []byte, v [][]byte) (int, error) {
var offset int
for i := range v {
off, err := BytesMarshal(field, buf[offset:], v[i])
if err != nil {
return 0, err
}
offset += off
}
return offset, nil
}
func RepeatedBytesSize(field int, v [][]byte) (size int) {
for i := range v {
size += BytesSize(field, v[i])
}
return size
}
func RepeatedStringMarshal(field int, buf []byte, v []string) (int, error) {
var offset int
for i := range v {
off, err := StringMarshal(field, buf[offset:], v[i])
if err != nil {
return 0, err
}
offset += off
}
return offset, nil
}
func RepeatedStringSize(field int, v []string) (size int) {
for i := range v {
size += StringSize(field, v[i])
}
return size
}
func RepeatedUInt64Marshal(field int, buf []byte, v []uint64) (int, error) {
if len(v) == 0 {
return 0, nil
}
prefix := field<<3 | 0x02
offset := binary.PutUvarint(buf, uint64(prefix))
_, arrSize := RepeatedUInt64Size(field, v)
offset += binary.PutUvarint(buf[offset:], uint64(arrSize))
for i := range v {
offset += binary.PutUvarint(buf[offset:], v[i])
}
return offset, nil
}
func RepeatedUInt64Size(field int, v []uint64) (size, arraySize int) {
if len(v) == 0 {
return 0, 0
}
for i := range v {
size += VarUIntSize(v[i])
}
arraySize = size
size += VarUIntSize(uint64(size))
prefix := field<<3 | 0x2
size += VarUIntSize(uint64(prefix))
return size, arraySize
}
func RepeatedInt64Marshal(field int, buf []byte, v []int64) (int, error) {
if len(v) == 0 {
return 0, nil
}
convert := make([]uint64, len(v))
for i := range v {
convert[i] = uint64(v[i])
}
return RepeatedUInt64Marshal(field, buf, convert)
}
func RepeatedInt64Size(field int, v []int64) (size, arraySize int) {
if len(v) == 0 {
return 0, 0
}
convert := make([]uint64, len(v))
for i := range v {
convert[i] = uint64(v[i])
}
return RepeatedUInt64Size(field, convert)
}
func RepeatedUInt32Marshal(field int, buf []byte, v []uint32) (int, error) {
if len(v) == 0 {
return 0, nil
}
convert := make([]uint64, len(v))
for i := range v {
convert[i] = uint64(v[i])
}
return RepeatedUInt64Marshal(field, buf, convert)
}
func RepeatedUInt32Size(field int, v []uint32) (size, arraySize int) {
if len(v) == 0 {
return 0, 0
}
convert := make([]uint64, len(v))
for i := range v {
convert[i] = uint64(v[i])
}
return RepeatedUInt64Size(field, convert)
}
func RepeatedInt32Marshal(field int, buf []byte, v []int32) (int, error) {
if len(v) == 0 {
return 0, nil
}
convert := make([]uint64, len(v))
for i := range v {
convert[i] = uint64(v[i])
}
return RepeatedUInt64Marshal(field, buf, convert)
}
func RepeatedInt32Size(field int, v []int32) (size, arraySize int) {
if len(v) == 0 {
return 0, 0
}
convert := make([]uint64, len(v))
for i := range v {
convert[i] = uint64(v[i])
}
return RepeatedUInt64Size(field, convert)
}
// varUIntSize returns length of varint byte sequence for uint64 value 'x'.
func VarUIntSize(x uint64) int {
return (bits.Len64(x|1) + 6) / 7
}
func NestedStructurePrefix(field int64) (prefix uint64, ln int) {
prefix = uint64(field<<3 | 0x02)
return prefix, VarUIntSize(prefix)
}
func NestedStructureMarshal(field int64, buf []byte, v stableMarshaller) (int, error) {
if v == nil || reflect.ValueOf(v).IsNil() {
return 0, nil
}
prefix, _ := NestedStructurePrefix(field)
offset := binary.PutUvarint(buf, prefix)
n := v.StableSize()
offset += binary.PutUvarint(buf[offset:], uint64(n))
_, err := v.StableMarshal(buf[offset:])
if err != nil {
return 0, err
}
return offset + n, nil
}
func NestedStructureSize(field int64, v stableMarshaller) (size int) {
if v == nil || reflect.ValueOf(v).IsNil() {
return 0
}
_, ln := NestedStructurePrefix(field)
n := v.StableSize()
size = ln + VarUIntSize(uint64(n)) + n
return size
}
func Fixed64Marshal(field int, buf []byte, v uint64) (int, error) {
if v == 0 {
return 0, nil
}
prefix := field<<3 | 1
// buf length check can prevent panic at PutUvarint, but it will make
// marshaller a bit slower.
i := binary.PutUvarint(buf, uint64(prefix))
binary.LittleEndian.PutUint64(buf[i:], v)
return i + 8, nil
}
func Fixed64Size(fNum int, v uint64) int {
if v == 0 {
return 0
}
prefix := fNum<<3 | 1
return VarUIntSize(uint64(prefix)) + 8
}