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[release-17.0] Fix a number of encoding issues when evaluating expres…
…sions with the evalengine (#13509) (#13551) Signed-off-by: Dirkjan Bussink <[email protected]> Co-authored-by: vitess-bot[bot] <108069721+vitess-bot[bot]@users.noreply.github.com>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,80 @@ | ||
| /* | ||
| Copyright 2023 The Vitess Authors. | ||
| Licensed under the Apache License, Version 2.0 (the "License"); | ||
| you may not use this file except in compliance with the License. | ||
| You may obtain a copy of the License at | ||
| http://www.apache.org/licenses/LICENSE-2.0 | ||
| Unless required by applicable law or agreed to in writing, software | ||
| distributed under the License is distributed on an "AS IS" BASIS, | ||
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| See the License for the specific language governing permissions and | ||
| limitations under the License. | ||
| */ | ||
|
|
||
| package hex | ||
|
|
||
| import ( | ||
| "encoding/hex" | ||
| "math/bits" | ||
| ) | ||
|
|
||
| const hextable = "0123456789ABCDEF" | ||
|
|
||
| func EncodeBytes(src []byte) []byte { | ||
| j := 0 | ||
| dst := make([]byte, len(src)*2) | ||
| for _, v := range src { | ||
| dst[j] = hextable[v>>4] | ||
| dst[j+1] = hextable[v&0x0f] | ||
| j += 2 | ||
| } | ||
| return dst | ||
| } | ||
|
|
||
| func EncodeUint(u uint64) []byte { | ||
| var a [16 + 1]byte | ||
| i := len(a) | ||
| shift := uint(bits.TrailingZeros(uint(16))) & 7 | ||
| b := uint64(16) | ||
| m := uint(16) - 1 // == 1<<shift - 1 | ||
|
|
||
| for u >= b { | ||
| i-- | ||
| a[i] = hextable[uint(u)&m] | ||
| u >>= shift | ||
| } | ||
|
|
||
| // u < base | ||
| i-- | ||
| a[i] = hextable[uint(u)] | ||
| return a[i:] | ||
| } | ||
|
|
||
| func DecodeUint(u uint64) []byte { | ||
| if u == 0 { | ||
| return []byte{0} | ||
| } | ||
| var decoded []byte | ||
| for u > 0 { | ||
| c1 := u % 10 | ||
| c2 := u % 100 / 10 | ||
| decoded = append([]byte{byte(c1 + c2<<4)}, decoded...) | ||
| u /= 100 | ||
| } | ||
| return decoded | ||
| } | ||
|
|
||
| func DecodedLen(src []byte) int { | ||
| return (len(src) + 1) / 2 | ||
| } | ||
|
|
||
| func DecodeBytes(dst, src []byte) bool { | ||
| if len(src)&1 == 1 { | ||
| src = append([]byte{'0'}, src...) | ||
| } | ||
| _, err := hex.Decode(dst, src) | ||
| return err == nil | ||
| } |
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