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remove dependency to external base62 package and create own methods i…
…n utils
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,59 @@ | ||
| package util | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "math" | ||
| "strings" | ||
| ) | ||
|
|
||
| const ( | ||
| alphabet = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz" | ||
| base = uint32(len(alphabet)) | ||
| ) | ||
|
|
||
| // EncodeBase62 encodes a uint32 value to a base62 string. | ||
| func EncodeBase62(num uint32) string { | ||
| if num == 0 { | ||
| return string(alphabet[0]) | ||
| } | ||
|
|
||
| var encoded strings.Builder | ||
| remainder := uint32(0) | ||
|
|
||
| for num > 0 { | ||
| remainder = num % base | ||
| encoded.WriteByte(alphabet[remainder]) | ||
| num /= base | ||
| } | ||
|
|
||
| // Reverse the encoded string | ||
| encodedString := encoded.String() | ||
| reversed := reverse(encodedString) | ||
| return reversed | ||
| } | ||
|
|
||
| // DecodeBase62 decodes a base62 string to a uint32 value. | ||
| func DecodeBase62(encoded string) (uint32, error) { | ||
| var decoded uint32 | ||
| strLen := len(encoded) | ||
|
|
||
| for i, char := range encoded { | ||
| index := strings.IndexRune(alphabet, char) | ||
| if index < 0 { | ||
| return 0, fmt.Errorf("invalid character: %c", char) | ||
| } | ||
|
|
||
| decoded += uint32(index) * uint32(math.Pow(float64(base), float64(strLen-i-1))) | ||
| } | ||
|
|
||
| return decoded, nil | ||
| } | ||
|
|
||
| // Reverse a string. | ||
| func reverse(s string) string { | ||
| runes := []rune(s) | ||
| for i, j := 0, len(runes)-1; i < j; i, j = i+1, j-1 { | ||
| runes[i], runes[j] = runes[j], runes[i] | ||
| } | ||
| return string(runes) | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,31 @@ | ||
| package util | ||
|
|
||
| import ( | ||
| "testing" | ||
| ) | ||
|
|
||
| func TestEncodeDecode(t *testing.T) { | ||
| tests := []struct { | ||
| num uint32 | ||
| }{ | ||
| {0}, | ||
| {1}, | ||
| {42}, | ||
| {12345}, | ||
| {99999}, | ||
| {123456789}, | ||
| } | ||
|
|
||
| for _, tt := range tests { | ||
| encoded := EncodeBase62(tt.num) | ||
| decoded, err := DecodeBase62(encoded) | ||
|
|
||
| if err != nil { | ||
| t.Errorf("Decode error: %v", err) | ||
| } | ||
|
|
||
| if decoded != tt.num { | ||
| t.Errorf("Decode(%v) = %v, want %v", encoded, decoded, tt.num) | ||
| } | ||
| } | ||
| } |