94 lines
2.3 KiB
C
94 lines
2.3 KiB
C
#include "files.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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// files.c corrections : MSB-first within each byte
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bit_array file_to_bits(const char *filename) {
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bit_array arr = {0};
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FILE *f = fopen(filename, "rb");
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if (!f) {
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perror("fopen");
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return arr;
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}
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fseek(f, 0, SEEK_END);
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long file_size = ftell(f);
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rewind(f);
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if (file_size <= 0) {
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fclose(f);
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return arr;
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}
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uint8_t *raw = (uint8_t*)malloc(file_size);
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if (!raw) { fclose(f); return arr; }
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fread(raw, 1, file_size, f);
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fclose(f);
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arr.nb_bits = (size_t)file_size * 8;
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arr.bits = (uint8_t*)malloc(arr.nb_bits * sizeof(uint8_t));
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if (!arr.bits) { free(raw); arr.nb_bits = 0; return arr; }
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// MSB-first in each byte: bit 7 -> index 0, bit 0 -> index 7
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for (size_t i = 0; i < (size_t)file_size; i++) {
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for (int b = 0; b < 8; b++) {
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arr.bits[i * 8 + b] = (raw[i] >> (7 - b)) & 1u;
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}
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}
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free(raw);
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return arr;
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}
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int bits_to_file(const char *filename, const bit_array *arr) {
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if (!arr || !arr->bits) return -1;
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size_t nb_bytes = (arr->nb_bits + 7) / 8;
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uint8_t *raw = (uint8_t*)calloc(nb_bytes, 1);
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if (!raw) return -1;
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// MSB-first packing: index bit 0 -> place at position 7 of first byte
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for (size_t i = 0; i < arr->nb_bits; i++) {
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if (arr->bits[i]) {
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size_t byte_idx = i / 8;
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int bit_in_byte = i % 8; // 0..7
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raw[byte_idx] |= (1u << (7 - bit_in_byte));
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}
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}
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FILE *f = fopen(filename, "wb");
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if (!f) { perror("fopen"); free(raw); return -1; }
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fwrite(raw, 1, nb_bytes, f);
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fclose(f);
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free(raw);
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return 0;
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}
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// Génère un nom du type "output.<ext>" où <ext> est l'extension du fichier d'entrée
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char* make_output_filename(const char *input_filename) {
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const char *dot = strrchr(input_filename, '.');
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const char *ext = dot ? dot + 1 : "bin";
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// Construire "output.<ext>"
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size_t len = strlen(ext) + strlen("output.") + 1;
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char *out = (char*)malloc(len);
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if (!out) return NULL;
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snprintf(out, len, "output.%s", ext);
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return out;
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}
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// Libérer la mémoire
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void free_bit_array(bit_array *arr) {
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if (arr && arr->bits) {
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free(arr->bits);
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arr->bits = NULL;
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arr->nb_bits = 0;
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}
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}
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