58 lines
1.1 KiB
Go
58 lines
1.1 KiB
Go
//go:build ignore
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package main
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import (
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"bytes"
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"fmt"
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"log"
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"os"
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)
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func generateDecodeMap() [256]byte {
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const alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
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var decodeMap [256]byte
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for i := 0; i < len(decodeMap); i++ {
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decodeMap[i] = 0xff
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}
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for i := 0; i < len(alphabet); i++ {
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decodeMap[alphabet[i]] = byte(i)
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}
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// for URL encoding
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decodeMap['-'] = decodeMap['+']
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decodeMap['_'] = decodeMap['/']
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return decodeMap
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}
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func main() {
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f, err := os.OpenFile("decode_map.go", os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0644)
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if err != nil {
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log.Fatal(err)
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}
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m := generateDecodeMap()
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var b bytes.Buffer
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fmt.Fprintf(&b, "// Code generated by generate_decode_map.go. DO NOT EDIT.\n\n")
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fmt.Fprintf(&b, "package base64dec\n\n")
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fmt.Fprintf(&b, "var decodeMap = [256]byte{")
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for i, v := range m {
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if i%16 == 0 {
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fmt.Fprintf(&b, "\n\t")
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} else {
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fmt.Fprint(&b, " ")
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}
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fmt.Fprintf(&b, "0x%02x,", v)
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}
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fmt.Fprintf(&b, "\n}\n")
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_, err = f.Write(b.Bytes())
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if err != nil {
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log.Fatal(err)
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}
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err = f.Close()
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if err != nil {
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log.Fatal(err)
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}
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}
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