50140. File Encoder and Decoder
難度：3/51
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36#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include "conversion.h"
void bin2ascii(char input_file[32], char output_file[32], char dict[17]){
FILE* f_in = fopen(input_file, "rb");
FILE* f_out = fopen(output_file, "w");
uint8_t n;
while(fread(&n, sizeof(uint8_t), 1, f_in) == 1){
fprintf(f_out, "%c%c", dict[(uint8_t) n >> 4], dict[n & (uint8_t)0xf]);
}
fclose(f_in);
fclose(f_out);
}
void ascii2bin(char input_file[32], char output_file[32], char dict[17]){
FILE* f_in = fopen(input_file, "r");
FILE* f_out = fopen(output_file, "wb");
char c1, c2;
while(fscanf(f_in, "%c%c", &c1, &c2) != EOF){
uint8_t i, j;
for(i = 0; i < 16; i++){
if(dict[i] == c1) break;
}
for(j = 0; j < 16; j++){
if(dict[j] == c2) break;
}
uint8_t n = i * 16 + j;
fwrite(&n, sizeof(uint8_t), 1, f_out);
}
fclose(f_in);
fclose(f_out);
}