The Ethernet-Board
Dependencies: EthernetInterface HTTPClient MODSERIAL mbed-dev mbed-rtos wolfSSL
Fork of sose2016_tr_oauth_pop by
base64.cpp@7:5d116f2e5587, 2016-07-12 (annotated)
- Committer:
- Cataract
- Date:
- Tue Jul 12 15:25:26 2016 +0000
- Revision:
- 7:5d116f2e5587
final commit
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
Cataract | 7:5d116f2e5587 | 1 | #include <stdint.h> |
Cataract | 7:5d116f2e5587 | 2 | #include <stdlib.h> |
Cataract | 7:5d116f2e5587 | 3 | |
Cataract | 7:5d116f2e5587 | 4 | |
Cataract | 7:5d116f2e5587 | 5 | static char encoding_table[] = {'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', |
Cataract | 7:5d116f2e5587 | 6 | 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', |
Cataract | 7:5d116f2e5587 | 7 | 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', |
Cataract | 7:5d116f2e5587 | 8 | 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f', |
Cataract | 7:5d116f2e5587 | 9 | 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', |
Cataract | 7:5d116f2e5587 | 10 | 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', |
Cataract | 7:5d116f2e5587 | 11 | 'w', 'x', 'y', 'z', '0', '1', '2', '3', |
Cataract | 7:5d116f2e5587 | 12 | '4', '5', '6', '7', '8', '9', '-', '_'}; |
Cataract | 7:5d116f2e5587 | 13 | static char *decoding_table = NULL; |
Cataract | 7:5d116f2e5587 | 14 | static int mod_table[] = {0, 2, 1}; |
Cataract | 7:5d116f2e5587 | 15 | |
Cataract | 7:5d116f2e5587 | 16 | |
Cataract | 7:5d116f2e5587 | 17 | void build_decoding_table() { |
Cataract | 7:5d116f2e5587 | 18 | |
Cataract | 7:5d116f2e5587 | 19 | decoding_table = (char*) malloc(256); |
Cataract | 7:5d116f2e5587 | 20 | |
Cataract | 7:5d116f2e5587 | 21 | for (int i = 0; i < 64; i++) |
Cataract | 7:5d116f2e5587 | 22 | decoding_table[(unsigned char) encoding_table[i]] = i; |
Cataract | 7:5d116f2e5587 | 23 | } |
Cataract | 7:5d116f2e5587 | 24 | |
Cataract | 7:5d116f2e5587 | 25 | |
Cataract | 7:5d116f2e5587 | 26 | void base64_cleanup() { |
Cataract | 7:5d116f2e5587 | 27 | free(decoding_table); |
Cataract | 7:5d116f2e5587 | 28 | } |
Cataract | 7:5d116f2e5587 | 29 | |
Cataract | 7:5d116f2e5587 | 30 | char *base64_encode(const unsigned char *data, |
Cataract | 7:5d116f2e5587 | 31 | size_t input_length, |
Cataract | 7:5d116f2e5587 | 32 | size_t *output_length) { |
Cataract | 7:5d116f2e5587 | 33 | |
Cataract | 7:5d116f2e5587 | 34 | *output_length = 4 * ((input_length +2) / 3); |
Cataract | 7:5d116f2e5587 | 35 | |
Cataract | 7:5d116f2e5587 | 36 | char *encoded_data = (char*) malloc(*output_length); |
Cataract | 7:5d116f2e5587 | 37 | if (encoded_data == NULL) return NULL; |
Cataract | 7:5d116f2e5587 | 38 | |
Cataract | 7:5d116f2e5587 | 39 | for (int i = 0, j = 0; i < input_length;) { |
Cataract | 7:5d116f2e5587 | 40 | |
Cataract | 7:5d116f2e5587 | 41 | uint32_t octet_a = i < input_length ? (unsigned char)data[i++] : 0; |
Cataract | 7:5d116f2e5587 | 42 | uint32_t octet_b = i < input_length ? (unsigned char)data[i++] : 0; |
Cataract | 7:5d116f2e5587 | 43 | uint32_t octet_c = i < input_length ? (unsigned char)data[i++] : 0; |
Cataract | 7:5d116f2e5587 | 44 | |
Cataract | 7:5d116f2e5587 | 45 | uint32_t triple = (octet_a << 0x10) + (octet_b << 0x08) + octet_c; |
Cataract | 7:5d116f2e5587 | 46 | |
Cataract | 7:5d116f2e5587 | 47 | encoded_data[j++] = encoding_table[(triple >> 3 * 6) & 0x3F]; |
Cataract | 7:5d116f2e5587 | 48 | encoded_data[j++] = encoding_table[(triple >> 2 * 6) & 0x3F]; |
Cataract | 7:5d116f2e5587 | 49 | encoded_data[j++] = encoding_table[(triple >> 1 * 6) & 0x3F]; |
Cataract | 7:5d116f2e5587 | 50 | encoded_data[j++] = encoding_table[(triple >> 0 * 6) & 0x3F]; |
Cataract | 7:5d116f2e5587 | 51 | } |
Cataract | 7:5d116f2e5587 | 52 | |
Cataract | 7:5d116f2e5587 | 53 | for (int i = 0; i < mod_table[input_length % 3]; i++) |
Cataract | 7:5d116f2e5587 | 54 | encoded_data[*output_length - 1 - i] = 0x00; |
Cataract | 7:5d116f2e5587 | 55 | |
Cataract | 7:5d116f2e5587 | 56 | return encoded_data; |
Cataract | 7:5d116f2e5587 | 57 | } |
Cataract | 7:5d116f2e5587 | 58 | |
Cataract | 7:5d116f2e5587 | 59 | |
Cataract | 7:5d116f2e5587 | 60 | unsigned char *base64_decode(const char *data, |
Cataract | 7:5d116f2e5587 | 61 | size_t input_length, |
Cataract | 7:5d116f2e5587 | 62 | size_t *output_length) { |
Cataract | 7:5d116f2e5587 | 63 | |
Cataract | 7:5d116f2e5587 | 64 | if (decoding_table == NULL) build_decoding_table(); |
Cataract | 7:5d116f2e5587 | 65 | |
Cataract | 7:5d116f2e5587 | 66 | if (input_length % 4 != 0) return NULL; |
Cataract | 7:5d116f2e5587 | 67 | |
Cataract | 7:5d116f2e5587 | 68 | *output_length = input_length / 4 * 3; |
Cataract | 7:5d116f2e5587 | 69 | if (data[input_length - 1] == '=') (*output_length)--; |
Cataract | 7:5d116f2e5587 | 70 | if (data[input_length - 2] == '=') (*output_length)--; |
Cataract | 7:5d116f2e5587 | 71 | |
Cataract | 7:5d116f2e5587 | 72 | unsigned char *decoded_data = (unsigned char*) malloc(*output_length); |
Cataract | 7:5d116f2e5587 | 73 | if (decoded_data == NULL) return NULL; |
Cataract | 7:5d116f2e5587 | 74 | |
Cataract | 7:5d116f2e5587 | 75 | for (int i = 0, j = 0; i < input_length;) { |
Cataract | 7:5d116f2e5587 | 76 | |
Cataract | 7:5d116f2e5587 | 77 | uint32_t sextet_a = data[i] == '=' ? 0 & i++ : decoding_table[data[i++]]; |
Cataract | 7:5d116f2e5587 | 78 | uint32_t sextet_b = data[i] == '=' ? 0 & i++ : decoding_table[data[i++]]; |
Cataract | 7:5d116f2e5587 | 79 | uint32_t sextet_c = data[i] == '=' ? 0 & i++ : decoding_table[data[i++]]; |
Cataract | 7:5d116f2e5587 | 80 | uint32_t sextet_d = data[i] == '=' ? 0 & i++ : decoding_table[data[i++]]; |
Cataract | 7:5d116f2e5587 | 81 | |
Cataract | 7:5d116f2e5587 | 82 | uint32_t triple = (sextet_a << 3 * 6) |
Cataract | 7:5d116f2e5587 | 83 | + (sextet_b << 2 * 6) |
Cataract | 7:5d116f2e5587 | 84 | + (sextet_c << 1 * 6) |
Cataract | 7:5d116f2e5587 | 85 | + (sextet_d << 0 * 6); |
Cataract | 7:5d116f2e5587 | 86 | |
Cataract | 7:5d116f2e5587 | 87 | if (j < *output_length) decoded_data[j++] = (triple >> 2 * 8) & 0xFF; |
Cataract | 7:5d116f2e5587 | 88 | if (j < *output_length) decoded_data[j++] = (triple >> 1 * 8) & 0xFF; |
Cataract | 7:5d116f2e5587 | 89 | if (j < *output_length) decoded_data[j++] = (triple >> 0 * 8) & 0xFF; |
Cataract | 7:5d116f2e5587 | 90 | } |
Cataract | 7:5d116f2e5587 | 91 | |
Cataract | 7:5d116f2e5587 | 92 | return decoded_data; |
Cataract | 7:5d116f2e5587 | 93 | } |