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improved base57 decode and tests

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This commit is contained in:
Giovanni Harting
2021-10-16 03:40:49 +02:00
parent 99ec0ad1bc
commit 867e85b007
4 changed files with 57 additions and 26 deletions
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28
csgo/sharecode.go
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@@ -1,7 +1,7 @@
package csgo
import (
"encoding/hex"
"encoding/binary"
"fmt"
"math/big"
"regexp"
@@ -12,13 +12,12 @@ import (
var DICT = "ABCDEFGHJKLMNOPQRSTUVWXYZabcdefhijkmnopqrstuvwxyz23456789"
var sharecodeRexEx = regexp.MustCompile("^CSGO(?:-?[\\w]{5}){5}$")
func DecodeSharecode(code string) (uint64, uint64, uint32, error) {
func DecodeSharecode(code string) (uint64, uint64, uint16, error) {
if !sharecodeRexEx.MatchString(code) {
return 0, 0, 0, fmt.Errorf("not a CSGO sharecode: %s", code)
}
cleanCode := strings.ReplaceAll(code, "CSGO", "")
cleanCode = strings.ReplaceAll(cleanCode, "-", "")
cleanCode := strings.ReplaceAll(strings.ReplaceAll(code, "CSGO", ""), "-", "")
chars := ReverseString(strings.Split(cleanCode, ""))
bigInt := new(big.Int)
@@ -29,24 +28,17 @@ func DecodeSharecode(code string) (uint64, uint64, uint32, error) {
bigInt.Add(bigInt, big.NewInt(int64(strings.Index(DICT, c))))
}
if bigInt.BitLen() > 144 {
return 0, 0, 0, fmt.Errorf("invalid sharecode")
}
bytes := make([]byte, 18)
bigInt.FillBytes(bytes)
matchId := new(big.Int)
matchId.SetString(hex.EncodeToString(Reverse(bytes[0:8])), 16)
outcomeId := new(big.Int)
outcomeId.SetString(hex.EncodeToString(Reverse(bytes[8:16])), 16)
tokenId := new(big.Int)
tokenId.SetString(hex.EncodeToString(Reverse(bytes[16:18])), 16)
matchId := binary.LittleEndian.Uint64(bytes[0:8])
outcomeId := binary.LittleEndian.Uint64(bytes[8:16])
tokenId := binary.LittleEndian.Uint16(bytes[16:18])
return matchId.Uint64(), outcomeId.Uint64(), uint32(tokenId.Uint64()), nil
}
func Reverse(numbers []byte) []byte {
for i, j := 0, len(numbers)-1; i < j; i, j = i+1, j-1 {
numbers[i], numbers[j] = numbers[j], numbers[i]
}
return numbers
return matchId, outcomeId, tokenId, nil
}
func ReverseString(numbers []string) []string {