forked from TrueCloudLab/frostfs-api-go
361 lines
7.4 KiB
Go
361 lines
7.4 KiB
Go
/*
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This package contains help functions for stable marshaller. Their usage is
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totally optional. One can implement fast stable marshaller without these
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runtime function calls.
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*/
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package proto
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import (
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"encoding/binary"
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"math"
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"math/bits"
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)
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type (
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stableMarshaller interface {
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StableMarshal([]byte) []byte
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StableSize() int
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}
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)
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func BytesMarshal(field int, buf, v []byte) int {
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if len(v) == 0 {
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return 0
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}
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return bytesMarshal(field, buf, v)
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}
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func bytesMarshal(field int, buf, v []byte) int {
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prefix := field<<3 | 0x2
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// buf length check can prevent panic at PutUvarint, but it will make
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// marshaller a bit slower.
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i := binary.PutUvarint(buf, uint64(prefix))
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i += binary.PutUvarint(buf[i:], uint64(len(v)))
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i += copy(buf[i:], v)
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return i
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}
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func BytesSize(field int, v []byte) int {
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ln := len(v)
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if ln == 0 {
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return 0
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}
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return bytesSize(field, v)
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}
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func bytesSize(field int, v []byte) int {
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prefix := field<<3 | 0x2
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return VarUIntSize(uint64(prefix)) + VarUIntSize(uint64(len(v))) + len(v)
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}
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func StringMarshal(field int, buf []byte, v string) int {
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return BytesMarshal(field, buf, []byte(v))
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}
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func StringSize(field int, v string) int {
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return BytesSize(field, []byte(v))
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}
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func BoolMarshal(field int, buf []byte, v bool) int {
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if !v {
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return 0
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}
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prefix := field << 3
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// buf length check can prevent panic at PutUvarint, but it will make
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// marshaller a bit slower.
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i := binary.PutUvarint(buf, uint64(prefix))
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buf[i] = 0x1
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return i + 1
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}
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func BoolSize(field int, v bool) int {
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if !v {
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return 0
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}
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prefix := field << 3
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return VarUIntSize(uint64(prefix)) + 1 // bool is always 1 byte long
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}
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func UInt64Marshal(field int, buf []byte, v uint64) int {
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if v == 0 {
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return 0
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}
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prefix := field << 3
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// buf length check can prevent panic at PutUvarint, but it will make
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// marshaller a bit slower.
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i := binary.PutUvarint(buf, uint64(prefix))
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i += binary.PutUvarint(buf[i:], v)
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return i
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}
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func UInt64Size(field int, v uint64) int {
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if v == 0 {
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return 0
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}
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prefix := field << 3
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return VarUIntSize(uint64(prefix)) + VarUIntSize(v)
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}
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func Int64Marshal(field int, buf []byte, v int64) int {
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return UInt64Marshal(field, buf, uint64(v))
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}
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func Int64Size(field int, v int64) int {
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return UInt64Size(field, uint64(v))
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}
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func UInt32Marshal(field int, buf []byte, v uint32) int {
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return UInt64Marshal(field, buf, uint64(v))
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}
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func UInt32Size(field int, v uint32) int {
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return UInt64Size(field, uint64(v))
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}
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func Int32Marshal(field int, buf []byte, v int32) int {
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return UInt64Marshal(field, buf, uint64(v))
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}
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func Int32Size(field int, v int32) int {
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return UInt64Size(field, uint64(v))
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}
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func EnumMarshal(field int, buf []byte, v int32) int {
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return UInt64Marshal(field, buf, uint64(v))
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}
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func EnumSize(field int, v int32) int {
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return UInt64Size(field, uint64(v))
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}
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func RepeatedBytesMarshal(field int, buf []byte, v [][]byte) int {
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var offset int
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for i := range v {
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offset += bytesMarshal(field, buf[offset:], v[i])
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}
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return offset
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}
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func RepeatedBytesSize(field int, v [][]byte) (size int) {
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for i := range v {
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size += bytesSize(field, v[i])
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}
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return size
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}
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func RepeatedStringMarshal(field int, buf []byte, v []string) int {
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var offset int
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for i := range v {
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offset += bytesMarshal(field, buf[offset:], []byte(v[i]))
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}
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return offset
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}
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func RepeatedStringSize(field int, v []string) (size int) {
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for i := range v {
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size += bytesSize(field, []byte(v[i]))
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}
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return size
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}
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func repeatedUIntSize[T ~uint64 | ~int64 | ~uint32 | ~int32](field int, v []T) (size, arraySize int) {
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if len(v) == 0 {
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return 0, 0
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}
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for i := range v {
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size += VarUIntSize(uint64(v[i]))
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}
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arraySize = size
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size += VarUIntSize(uint64(size))
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prefix := field<<3 | 0x2
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size += VarUIntSize(uint64(prefix))
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return size, arraySize
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}
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func repeatedUIntMarshal[T ~uint64 | ~int64 | ~uint32 | ~int32](field int, buf []byte, v []T) int {
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if len(v) == 0 {
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return 0
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}
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prefix := field<<3 | 0x02
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offset := binary.PutUvarint(buf, uint64(prefix))
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_, arrSize := repeatedUIntSize(field, v)
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offset += binary.PutUvarint(buf[offset:], uint64(arrSize))
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for i := range v {
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offset += binary.PutUvarint(buf[offset:], uint64(v[i]))
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}
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return offset
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}
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func RepeatedUInt64Marshal(field int, buf []byte, v []uint64) int {
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return repeatedUIntMarshal(field, buf, v)
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}
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func RepeatedUInt64Size(field int, v []uint64) (size, arraySize int) {
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return repeatedUIntSize(field, v)
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}
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func RepeatedInt64Marshal(field int, buf []byte, v []int64) int {
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return repeatedUIntMarshal(field, buf, v)
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}
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func RepeatedInt64Size(field int, v []int64) (size, arraySize int) {
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return repeatedUIntSize(field, v)
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}
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func RepeatedUInt32Marshal(field int, buf []byte, v []uint32) int {
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return repeatedUIntMarshal(field, buf, v)
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}
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func RepeatedUInt32Size(field int, v []uint32) (size, arraySize int) {
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return repeatedUIntSize(field, v)
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}
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func RepeatedInt32Marshal(field int, buf []byte, v []int32) int {
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return repeatedUIntMarshal(field, buf, v)
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}
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func RepeatedInt32Size(field int, v []int32) (size, arraySize int) {
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return repeatedUIntSize(field, v)
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}
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// VarUIntSize returns length of varint byte sequence for uint64 value 'x'.
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func VarUIntSize(x uint64) int {
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return (bits.Len64(x|1) + 6) / 7
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}
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func NestedStructurePrefix(field int64) (prefix uint64, ln int) {
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prefix = uint64(field<<3 | 0x02)
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return prefix, VarUIntSize(prefix)
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}
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func NestedStructureMarshal(field int64, buf []byte, v stableMarshaller) int {
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n := v.StableSize()
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if n == 0 {
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return 0
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}
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prefix, _ := NestedStructurePrefix(field)
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offset := binary.PutUvarint(buf, prefix)
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offset += binary.PutUvarint(buf[offset:], uint64(n))
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v.StableMarshal(buf[offset:])
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return offset + n
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}
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func NestedStructureSize(field int64, v stableMarshaller) (size int) {
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n := v.StableSize()
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if n == 0 {
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return 0
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}
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_, ln := NestedStructurePrefix(field)
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size = ln + VarUIntSize(uint64(n)) + n
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return size
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}
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func Fixed64Marshal(field int, buf []byte, v uint64) int {
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if v == 0 {
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return 0
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}
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prefix := field<<3 | 1
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// buf length check can prevent panic at PutUvarint, but it will make
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// marshaller a bit slower.
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i := binary.PutUvarint(buf, uint64(prefix))
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binary.LittleEndian.PutUint64(buf[i:], v)
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return i + 8
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}
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func Fixed64Size(fNum int, v uint64) int {
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if v == 0 {
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return 0
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}
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prefix := fNum<<3 | 1
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return VarUIntSize(uint64(prefix)) + 8
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}
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func Float64Marshal(field int, buf []byte, v float64) int {
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if v == 0 {
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return 0
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}
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prefix := field<<3 | 1
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i := binary.PutUvarint(buf, uint64(prefix))
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binary.LittleEndian.PutUint64(buf[i:], math.Float64bits(v))
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return i + 8
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}
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func Float64Size(fNum int, v float64) int {
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if v == 0 {
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return 0
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}
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prefix := fNum<<3 | 1
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return VarUIntSize(uint64(prefix)) + 8
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}
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// Fixed32Marshal encodes uint32 value to Protocol Buffers fixed32 field with specified number,
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// and writes it to specified buffer. Returns number of bytes written.
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//
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// Panics if the buffer is undersized.
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func Fixed32Marshal(field int, buf []byte, v uint32) int {
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if v == 0 {
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return 0
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}
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prefix := field<<3 | 5
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// buf length check can prevent panic at PutUvarint, but it will make
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// marshaller a bit slower.
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i := binary.PutUvarint(buf, uint64(prefix))
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binary.LittleEndian.PutUint32(buf[i:], v)
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return i + 4
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}
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// Fixed32Size returns number of bytes required to encode uint32 value to Protocol Buffers fixed32 field
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// with specified number.
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func Fixed32Size(fNum int, v uint32) int {
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if v == 0 {
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return 0
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}
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prefix := fNum<<3 | 5
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return VarUIntSize(uint64(prefix)) + 4
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}
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