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Add base64_encode() to utils

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Lorenz Stechauner
2022-08-17 12:57:07 +02:00
parent 0648c75baa
commit ee8aedce91
2 changed files with 27 additions and 0 deletions
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src/lib/utils.c
+21
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@@ -173,3 +173,24 @@ int str_trim_lws(char **start, char **end) {
(*end)++;
return 0;
}
int base64_encode(void *data, unsigned long data_len, char *output, unsigned long *output_len) {
unsigned long out_len = 4 * ((data_len + 2) / 3);
if (output_len != NULL) *output_len = out_len;
for (int i = 0, j = 0; i < data_len;) {
unsigned int octet_a = (i < data_len) ? ((unsigned char *) data)[i++] : 0;
unsigned int octet_b = (i < data_len) ? ((unsigned char *) data)[i++] : 0;
unsigned int octet_c = (i < data_len) ? ((unsigned char *) data)[i++] : 0;
unsigned int triple = (octet_a << 0x10) + (octet_b << 0x08) + octet_c;
output[j++] = base64_encode_table[(triple >> 3 * 6) & 0x3F];
output[j++] = base64_encode_table[(triple >> 2 * 6) & 0x3F];
output[j++] = base64_encode_table[(triple >> 1 * 6) & 0x3F];
output[j++] = base64_encode_table[(triple >> 0 * 6) & 0x3F];
}
for (int i = 0; i < base64_mod_table[data_len % 3]; i++)
output[out_len - 1 - i] = '=';
return 0;
}