Little changes and debug

files/files.c

@@ -3,7 +3,8 @@
 #include <stdlib.h>
 #include <string.h>
 
-// Lire un fichier binaire et en faire un tableau de bits (0/1)
+// files.c corrections : MSB-first within each byte
+
 bit_array file_to_bits(const char *filename) {
     bit_array arr = {0};
 
@@ -13,7 +14,6 @@ bit_array file_to_bits(const char *filename) {
         return arr;
     }
 
-    // Taille fichier
     fseek(f, 0, SEEK_END);
     long file_size = ftell(f);
     rewind(f);
@@ -23,27 +23,19 @@ bit_array file_to_bits(const char *filename) {
         return arr;
     }
 
-    // Lire tous les octets
     uint8_t *raw = (uint8_t*)malloc(file_size);
-    if (!raw) {
-        fclose(f);
-        return arr;
-    }
+    if (!raw) { fclose(f); return arr; }
     fread(raw, 1, file_size, f);
     fclose(f);
 
-    // Convertir en bits (0/1 dans uint8_t)
     arr.nb_bits = (size_t)file_size * 8;
-    arr.bits = (uint8_t*)malloc(arr.nb_bits);
-    if (!arr.bits) {
-        free(raw);
-        arr.nb_bits = 0;
-        return arr;
-    }
+    arr.bits = (uint8_t*)malloc(arr.nb_bits * sizeof(uint8_t));
+    if (!arr.bits) { free(raw); arr.nb_bits = 0; return arr; }
 
+    // MSB-first in each byte: bit 7 -> index 0, bit 0 -> index 7
     for (size_t i = 0; i < (size_t)file_size; i++) {
         for (int b = 0; b < 8; b++) {
-            arr.bits[i * 8 + b] = (raw[i] >> b) & 1u;
+            arr.bits[i * 8 + b] = (raw[i] >> (7 - b)) & 1u;
         }
     }
 
@@ -51,7 +43,6 @@ bit_array file_to_bits(const char *filename) {
     return arr;
 }
 
-// Transformer un tableau de bits (0/1) en fichier binaire
 int bits_to_file(const char *filename, const bit_array *arr) {
     if (!arr || !arr->bits) return -1;
 
@@ -59,19 +50,17 @@ int bits_to_file(const char *filename, const bit_array *arr) {
     uint8_t *raw = (uint8_t*)calloc(nb_bytes, 1);
     if (!raw) return -1;
 
+    // MSB-first packing: index bit 0 -> place at position 7 of first byte
     for (size_t i = 0; i < arr->nb_bits; i++) {
         if (arr->bits[i]) {
-            raw[i / 8] |= (1u << (i % 8));
+            size_t byte_idx = i / 8;
+            int bit_in_byte = i % 8; // 0..7
+            raw[byte_idx] |= (1u << (7 - bit_in_byte));
         }
     }
 
     FILE *f = fopen(filename, "wb");
-    if (!f) {
-        perror("fopen");
-        free(raw);
-        return -1;
-    }
-
+    if (!f) { perror("fopen"); free(raw); return -1; }
     fwrite(raw, 1, nb_bytes, f);
     fclose(f);
     free(raw);

files/files.h

@@ -19,3 +19,4 @@ char* make_output_filename(const char *input_filename);
 
 // Libérer la mémoire du bit_array
 void free_bit_array(bit_array *arr);
+