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// Copyright © 2020 rsiddharth <s@ricketyspace.net>
// SPDX-License-Identifier: ISC
package lib
// Adapted from
// https://go.googlesource.com/go/+/refs/tags/go1.15/src/encoding/hex/hex.go#83
func HexCharToDec(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
}
func DecToHexChar(i uint16) byte {
switch {
case 0 <= i && i <= 9:
return byte(48 + i)
case 10 <= i && i <= 15:
return byte(97 + (i - 10))
}
return 0
}
// 'h' must be hex encoded string.
func HexStrToAsciiStr(h string) string {
a := ""
lh := len(h)
if lh < 1 {
return a
}
if lh == 1 {
return string(HexCharToDec(h[0]))
}
for i := 0; i < lh; i += 2 {
b := HexCharToDec(h[i])<<4 | HexCharToDec(h[i+1])
a += string(b)
}
return a
}
func ByteToHexStr(b byte) string {
p := DecToHexChar(uint16(b >> 4))
q := DecToHexChar(uint16(b & 0xf))
s := string(p)
s += string(q)
return s
}
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