| | |
| | | /* vim: set ts=4 sts=4 sw=4 noet : */ |
| | | /* vim: set ts=4 sts=4 sw=4 noet : */ |
| | | #include<stdio.h> |
| | | #include<general.h> |
| | | #include<snapshot.h> |
| | |
| | | static int mod_table[] = {0, 2, 1}; |
| | | |
| | | |
| | | char *base64_encode(const unsigned char *data, |
| | | size_t input_length, |
| | | size_t *output_length) { |
| | | |
| | | char *base64_encode(const unsigned char *data, size_t input_length, size_t *output_length) { |
| | | *output_length = 4 * ((input_length + 2) / 3); |
| | | int i,j; |
| | | char *encoded_data = malloc(*output_length); |
| | |
| | | |
| | | for (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 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; |
| | | |
| | | 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]; |
| | | 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 (i = 0; i < mod_table[input_length % 3]; i++) |
| | | encoded_data[*output_length - 1 - i] = '='; |
| | | encoded_data[*output_length - 1 - i] = '='; |
| | | |
| | | return encoded_data; |
| | | } |
| | | |
| | | |
| | | unsigned char *base64_decode(const char *data, |
| | | size_t input_length, |
| | | size_t *output_length) { |
| | | |
| | | unsigned char *base64_decode(const char *data, size_t input_length, size_t *output_length) { |
| | | int i,j; |
| | | if (decoding_table == NULL) build_decoding_table(); |
| | | |
| | |
| | | if (decoded_data == NULL) return NULL; |
| | | |
| | | for (i = 0, j = 0; i < input_length;) { |
| | | uint32_t sextet_a = data[i] == '=' ? 0 & i++ : decoding_table[(int)data[i++]]; |
| | | uint32_t sextet_b = data[i] == '=' ? 0 & i++ : decoding_table[(int)data[i++]]; |
| | | uint32_t sextet_c = data[i] == '=' ? 0 & i++ : decoding_table[(int)data[i++]]; |
| | | uint32_t sextet_d = data[i] == '=' ? 0 & i++ : decoding_table[(int)data[i++]]; |
| | | |
| | | uint32_t sextet_a = data[i] == '=' ? 0 & i++ : decoding_table[(int)data[i++]]; |
| | | uint32_t sextet_b = data[i] == '=' ? 0 & i++ : decoding_table[(int)data[i++]]; |
| | | uint32_t sextet_c = data[i] == '=' ? 0 & i++ : decoding_table[(int)data[i++]]; |
| | | uint32_t sextet_d = data[i] == '=' ? 0 & i++ : decoding_table[(int)data[i++]]; |
| | | |
| | | uint32_t triple = (sextet_a << 3 * 6) |
| | | 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; |
| | | 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; |
| | | } |
| | | if(decoding_table !=NULL) free(decoding_table); |
| | | return decoded_data; |
| | |
| | | decoding_table = malloc(256); |
| | | int i; |
| | | for (i = 0; i < 64; i++) |
| | | decoding_table[(unsigned char) encoding_table[i]] = i; |
| | | decoding_table[(unsigned char) encoding_table[i]] = i; |
| | | } |
| | | |
| | | |