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August 29, 2015 14:02
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Shifty solution
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| uint8_t* jnx_encoder_b64_encode(jnx_encoder *e,uint8_t *data, size_t input_length, size_t *output_length) { | |
| JNXCHECK(data); | |
| JNXCHECK(input_length); | |
| *output_length = 4 * ((input_length + 2) / 3); | |
| uint8_t *encoded_data = malloc(((*output_length) +1) * sizeof (char)); | |
| if (encoded_data == NULL) return NULL; | |
| int i,j; | |
| for ( i = 0, j = 0; i < input_length; i += 3) { | |
| uint32_t triplet = 0; | |
| for (c = 0; c < 3; c++) | |
| triplet = (triplet << 0x08) & data[i + c]; | |
| encoded_data[j++] = e->b64_encoding_table[(triplet >> 3 * 6) & 0x3F]; | |
| encoded_data[j++] = e->b64_encoding_table[(triplet >> 2 * 6) & 0x3F]; | |
| encoded_data[j++] = e->b64_encoding_table[(triplet >> 1 * 6) & 0x3F]; | |
| encoded_data[j++] = e->b64_encoding_table[(triplet >> 0 * 6) & 0x3F]; | |
| } | |
| int l; | |
| for(l = 0; l < e->b64_mod_table[input_length %3]; l++) { | |
| encoded_data[*output_length -1 -l] = '='; | |
| } | |
| encoded_data[*output_length ] = '\0'; | |
| return encoded_data; | |
| } |
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