The Ethernet-Board
Dependencies: EthernetInterface HTTPClient MODSERIAL mbed-dev mbed-rtos wolfSSL
Fork of sose2016_tr_oauth_pop by
base64.cpp
- Committer:
- Cataract
- Date:
- 2016-07-12
- Revision:
- 7:5d116f2e5587
File content as of revision 7:5d116f2e5587:
#include <stdint.h> #include <stdlib.h> static char encoding_table[] = {'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '-', '_'}; static char *decoding_table = NULL; static int mod_table[] = {0, 2, 1}; void build_decoding_table() { decoding_table = (char*) malloc(256); for (int i = 0; i < 64; i++) decoding_table[(unsigned char) encoding_table[i]] = i; } void base64_cleanup() { free(decoding_table); } char *base64_encode(const unsigned char *data, size_t input_length, size_t *output_length) { *output_length = 4 * ((input_length +2) / 3); char *encoded_data = (char*) malloc(*output_length); if (encoded_data == NULL) return NULL; for (int i = 0, j = 0; i < input_length;) { uint32_t octet_a = i < input_length ? (unsigned char)data[i++] : 0; uint32_t octet_b = i < input_length ? (unsigned char)data[i++] : 0; uint32_t octet_c = i < input_length ? (unsigned char)data[i++] : 0; uint32_t triple = (octet_a << 0x10) + (octet_b << 0x08) + octet_c; encoded_data[j++] = encoding_table[(triple >> 3 * 6) & 0x3F]; encoded_data[j++] = encoding_table[(triple >> 2 * 6) & 0x3F]; encoded_data[j++] = encoding_table[(triple >> 1 * 6) & 0x3F]; encoded_data[j++] = encoding_table[(triple >> 0 * 6) & 0x3F]; } for (int i = 0; i < mod_table[input_length % 3]; i++) encoded_data[*output_length - 1 - i] = 0x00; return encoded_data; } unsigned char *base64_decode(const char *data, size_t input_length, size_t *output_length) { if (decoding_table == NULL) build_decoding_table(); if (input_length % 4 != 0) return NULL; *output_length = input_length / 4 * 3; if (data[input_length - 1] == '=') (*output_length)--; if (data[input_length - 2] == '=') (*output_length)--; unsigned char *decoded_data = (unsigned char*) malloc(*output_length); if (decoded_data == NULL) return NULL; for (int i = 0, j = 0; i < input_length;) { uint32_t sextet_a = data[i] == '=' ? 0 & i++ : decoding_table[data[i++]]; uint32_t sextet_b = data[i] == '=' ? 0 & i++ : decoding_table[data[i++]]; uint32_t sextet_c = data[i] == '=' ? 0 & i++ : decoding_table[data[i++]]; uint32_t sextet_d = data[i] == '=' ? 0 & i++ : decoding_table[data[i++]]; uint32_t triple = (sextet_a << 3 * 6) + (sextet_b << 2 * 6) + (sextet_c << 1 * 6) + (sextet_d << 0 * 6); if (j < *output_length) decoded_data[j++] = (triple >> 2 * 8) & 0xFF; if (j < *output_length) decoded_data[j++] = (triple >> 1 * 8) & 0xFF; if (j < *output_length) decoded_data[j++] = (triple >> 0 * 8) & 0xFF; } return decoded_data; }