sk1

sk1/compressor.c

@@ -59,43 +59,33 @@ int compress_1(const char* input_file_name, const char* output_file_name) {
     return 0;
 }
 int decompress_1(const char* input_file_name, const char* output_file_name) {
-    size_t size;
-    unsigned char* data;
-    if (read_file(input_file_name, &data, &size) != 0) return -1;
+    FILE* input_file = fopen(input_file_name, "rb");
+    if (!input_file) return -1;
 
-    unsigned char* decompressed = malloc(size * 255);
-    if (!decompressed) {
-        free(data);
+    FILE* output_file = fopen(output_file_name, "wb");
+    if (!output_file) {
+        fclose(input_file);
         return -1;
     }
 
-    size_t write_idx = 0;
-    for (size_t i = 0; i < size;) {
-        unsigned char byte = data[i++];
-        size_t count = 0;
-        while (i < size && isdigit(data[i])) {
-            count = count * 10 + (data[i++] - '0');
+    unsigned char index, byte;
+    while (fread(&index, 1, 1, input_file) == 1) {
+        if (fread(&byte, 1, 1, input_file) == 1) {
+            for (int i = 0; i < index; i++) {
+                fwrite(&byte, 1, 1, output_file);
             }
-        for (size_t j = 0; j < count; j++) {
-            if (write_idx >= size * 255) {
-                size_t new_size = write_idx * 2;
-                unsigned char* new_buffer = realloc(decompressed, new_size);
-                if (!new_buffer) {
-                    free(decompressed);
-                    free(data);
+        }
+        else {
+            // Якщо ми не змогли прочитати байт, закриваємо файли та повертаємо помилку
+            fclose(input_file);
+            fclose(output_file);
             return -1;
         }
-                decompressed = new_buffer;
-            }
-            decompressed[write_idx++] = byte;
-        }
     }
 
-    int result = write_file(output_file_name, decompressed, write_idx);
-    free(data);
-    free(decompressed);
-
-    return result == 0 ? (int)write_idx : -1;
+    fclose(input_file);
+    fclose(output_file);
+    return 0;
 }
 
 // LZ78