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This commit is contained in:
Bruno Rybársky
2025-05-04 00:39:45 +02:00
parent 4a0ca11c9a
commit 45872bc035
4 changed files with 409 additions and 68 deletions
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96
base.c
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@@ -5,54 +5,68 @@
#include <string.h>
#include <stdio.h>
#include <stdint-gcc.h>
#include <malloc.h>
#include "base.h"
// Base64 decoding table
const unsigned char dtable[256] = {
['A'] = 0, ['B'] = 1, ['C'] = 2, ['D'] = 3,
['E'] = 4, ['F'] = 5, ['G'] = 6, ['H'] = 7,
['I'] = 8, ['J'] = 9, ['K'] = 10, ['L'] = 11,
['M'] = 12, ['N'] = 13, ['O'] = 14, ['P'] = 15,
['Q'] = 16, ['R'] = 17, ['S'] = 18, ['T'] = 19,
['U'] = 20, ['V'] = 21, ['W'] = 22, ['X'] = 23,
['Y'] = 24, ['Z'] = 25,
['a'] = 26, ['b'] = 27, ['c'] = 28, ['d'] = 29,
['e'] = 30, ['f'] = 31, ['g'] = 32, ['h'] = 33,
['i'] = 34, ['j'] = 35, ['k'] = 36, ['l'] = 37,
['m'] = 38, ['n'] = 39, ['o'] = 40, ['p'] = 41,
['q'] = 42, ['r'] = 43, ['s'] = 44, ['t'] = 45,
['u'] = 46, ['v'] = 47, ['w'] = 48, ['x'] = 49,
['y'] = 50, ['z'] = 51,
['0'] = 52, ['1'] = 53, ['2'] = 54, ['3'] = 55,
['4'] = 56, ['5'] = 57, ['6'] = 58, ['7'] = 59,
['8'] = 60, ['9'] = 61, ['+'] = 62, ['/'] = 63,
};
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;
void build_decoding_table() {
int base64_decode(const char *in, unsigned char *out, size_t *out_len) {
size_t len = strlen(in);
size_t i, j;
unsigned char a, b, c, d;
decoding_table = malloc(256);
if (len % 4 != 0) return -1;
for (i = 0, j = 0; i < len; i += 4) {
a = dtable[(unsigned char)in[i]];
b = dtable[(unsigned char)in[i+1]];
c = dtable[(unsigned char)in[i+2]];
d = dtable[(unsigned char)in[i+3]];
out[j++] = (a << 2) | (b >> 4);
if (in[i+2] != '=') {
out[j++] = (b << 4) | (c >> 2);
if (in[i+3] != '=')
out[j++] = (c << 6) | d;
}
}
*out_len = j;
return 0;
for (int i = 0; i < 64; i++)
decoding_table[(unsigned char) encoding_table[i]] = i;
}
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) {
printf("babbaba %zu\n", input_length);
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 = malloc(*output_length);
if (decoded_data == NULL) {
printf("fefefefeg\n");
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;
}
void hex_dump(const unsigned char *data, size_t len) {
for (size_t i = 0; i < len; i++) {
printf("%02X ", data[i]);