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// Copyright © 2020 rsiddharth <s@ricketyspace.net>
// SPDX-License-Identifier: ISC
package enc
const b64_table = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
func HexToBase64(hex string) string {
hb := []byte(hex)
b64 := ""
for i := 0; i <= len(hb)-3; i = i + 3 {
a := fromHexChar(hb[i])<<8 | fromHexChar(hb[i+1])<<4 | fromHexChar(hb[i+2])
b64 += encode(a >> 6)
b64 += encode(a & 0b111111)
}
return b64
}
func encode(b uint16) string {
return string(b64_table[b])
}
// adapted from
// https://go.googlesource.com/go/+/refs/tags/go1.15/src/encoding/hex/hex.go#83
func fromHexChar(c byte) uint16 {
switch {
case '0' <= c && c <= '9':
return uint16(c - '0')
case 'a' <= c && c <= 'f':
return uint16(c - 'a' + 10)
}
return 0
}
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