Speicherreservierung fuer Bildserie

Startcode/imageInput.c

@@ -9,10 +9,76 @@
 // TODO Implementieren Sie geeignete Hilfsfunktionen für das Lesen der Bildserie aus einer Datei
 
 // TODO Vervollständigen Sie die Funktion readImages unter Benutzung Ihrer Hilfsfunktionen
+static int Header_check(FILE *file) {
+    char puffer[BUFFER_SIZE] = {0};
+
+    fread(puffer, sizeof (char), strlen(FILE_HEADER_STRING), file);
+
+    if (!strcmp(puffer, FILE_HEADER_STRING)) {
+        return 1;
+    }
+    return 0;
+}
+
+static int readDimensions(FILE *file, unsigned short werte[]) {
+    size_t anzahl_gelesen = fread(werte, sizeof (unsigned short), 3, file);
+
+    if (anzahl_gelesen == 3) {
+    return 1;
+    }
+    return 0;
+}
+
+static GrayScaleImageSeries *createSeries(unsigned short anzahl){
+    GrayScaleImageSeries *series = (GrayScaleImageSeries *)malloc(sizeof(GrayScaleImageSeries));
+    if (series == NULL) {
+        return NULL;
+    }
+    series->count = anzahl;
+
+    series->labels = (unsigned char *)calloc(anzahl, sizeof(unsigned char));
+    if (series->labels == NULL) {
+        free(series);
+        return NULL;
+    }
+
+    series->images = (GrayScaleImage *)calloc(anzahl, sizeof(GrayScaleImage));
+    if (series->images == NULL) {
+        free(series->labels);
+        free(series);
+        return NULL;
+    }
+
+
+    return series;
+}
+
 GrayScaleImageSeries *readImages(const char *path)
 {
     GrayScaleImageSeries *series = NULL;
-    
+
+    FILE *bilder = fopen(path, "rb");
+    if (bilder == NULL) {
+        printf("Error opening file\n");
+        return NULL;
+    }
+
+    if (Header_check(bilder) == 0) {
+        fclose(bilder);
+        return NULL;
+    }
+
+    unsigned short werte[3];
+    if (readDimensions(bilder, werte) == 0) {
+        fclose(bilder);
+        return NULL;
+    }
+    series = createSeries(werte[0]);
+    if (series == NULL) {
+        fclose(bilder);
+        return NULL;
+    }
+
     return series;
 }