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base64: add encode
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commit
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@ -47,3 +47,49 @@ fn decode(data string) string {
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return tos(str, str_len+2)
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}
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const (
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EncodingTable = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'
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)
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fn encode(data string) string {
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input_length := data.len
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output_length := 4 * ((input_length + 2) / 3)
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mut i := 0
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mut j := 0
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mut str := malloc(output_length)
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for i < input_length {
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mut octet_a := 0
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mut octet_b := 0
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mut octet_c := 0
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if i < input_length {
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octet_a = int(data[i])
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i++
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}
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if i < input_length {
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octet_b = int(data[i])
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i++
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}
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if i < input_length {
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octet_c = int(data[i])
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i++
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}
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triple := ((octet_a << 0x10) + (octet_b << 0x08) + octet_c)
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str[j+0] = EncodingTable[(triple >> 3 * 6) & 63] // 63 is 0x3F
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str[j+1] = EncodingTable[(triple >> 2 * 6) & 63]
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str[j+2] = EncodingTable[(triple >> 1 * 6) & 63]
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str[j+3] = EncodingTable[(triple >> 0 * 6) & 63]
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j += 4
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}
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mod_table := [0, 2, 1]
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for i = 0; i < mod_table[input_length % 3]; i++ {
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str[output_length - 1 - i] = `=`
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}
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return tos(str, output_length)
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}
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