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Aliaksandr Valialkin 2024-04-28 22:03:27 +02:00
parent 6d3b506dcf
commit d724da794f
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GPG key ID: 52C003EE2BCDB9EB
2 changed files with 31 additions and 7 deletions
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30
lib/encoding/int.go
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@ -83,9 +83,22 @@ func UnmarshalInt64(src []byte) int64 {
// MarshalVarInt64 appends marshalsed v to dst and returns the result.
func MarshalVarInt64(dst []byte, v int64) []byte {
var tmp [1]int64
tmp[0] = v
return MarshalVarInt64s(dst, tmp[:])
u := uint64((v << 1) ^ (v >> 63))
if v < (1<<6) && v > (-1<<6) {
return append(dst, byte(u))
}
if u < (1 << (2 * 7)) {
return append(dst, byte(u|0x80), byte(u>>7))
}
if u < (1 << (3 * 7)) {
return append(dst, byte(u|0x80), byte((u>>7)|0x80), byte(u>>(2*7)))
}
// Slow path for big integers
var tmp [1]uint64
tmp[0] = u
return MarshalVarUint64s(dst, tmp[:])
}
// MarshalVarInt64s appends marshaled vs to dst and returns the result.
@ -268,6 +281,17 @@ func unmarshalVarInt64sSlow(dst []int64, src []byte) ([]byte, error) {
// MarshalVarUint64 appends marshaled u to dst and returns the result.
func MarshalVarUint64(dst []byte, u uint64) []byte {
if u < (1 << 7) {
return append(dst, byte(u))
}
if u < (1 << (2 * 7)) {
return append(dst, byte(u|0x80), byte(u>>7))
}
if u < (1 << (3 * 7)) {
return append(dst, byte(u|0x80), byte((u>>7)|0x80), byte(u>>(2*7)))
}
// Slow path for big integers.
var tmp [1]uint64
tmp[0] = u
return MarshalVarUint64s(dst, tmp[:])