forked from TrueCloudLab/frostfs-api-go
45 lines
925 B
Go
45 lines
925 B
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"
|
||
|
|
)
|
||
|
|
|
||
|
|
func BytesMarshal(field int, buf, v []byte) (int, error) {
|
||
|
|
if len(v) == 0 {
|
||
|
|
return 0, nil
|
||
|
|
}
|
||
|
|
|
||
|
|
// buf length check can prevent panic at PutUvarint, but it will make
|
||
|
|
// marshaller a bit slower.
|
||
|
|
|
||
|
|
prefix := field<<3 | 0x2
|
||
|
|
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
|
||
|
|
}
|
||
|
|
|
||
|
|
// varUIntSize returns length of varint byte sequence for uint64 value 'x'.
|
||
|
|
func VarUIntSize(x uint64) int {
|
||
|
|
return (bits.Len64(x|1) + 6) / 7
|
||
|
|
}
|