implemented header check

Startcode/imageInput.c

@@ -8,15 +8,93 @@
 
 // TODO Implementieren Sie geeignete Hilfsfunktionen für das Lesen der Bildserie aus einer Datei
 
+static GrayScaleImage *readIndividualImage(unsigned int width, unsigned int height, FILE *file){
+
+    char *buf = calloc(width * height, sizeof(char));
+    if(!buf){
+        fprintf(stderr, "calloc failed!\n");
+        return NULL;
+    }
+    if(fread(buf, sizeof(char), width * height,file) != (width* height)){
+        fprintf(stderr, "imageline not in the rigth format!\n");
+        free(buf);
+        return NULL;
+    }
+
+    GrayScaleImage *gimage = calloc(sizeof(GrayScaleImage, 1));
+    if(gimage == NULL){
+        fprintf(stderr, "calloc failed!\n");
+        free(buf);
+        return NULL;
+    }
+    
+    gimage->buffer = buf;
+    gimage->width = width;
+    gimage->height = height;
+
+    return gimage;
+}
+
 // TODO Vervollständigen Sie die Funktion readImages unter Benutzung Ihrer Hilfsfunktionen
 GrayScaleImageSeries *readImages(const char *path)
 {
     GrayScaleImageSeries *series = NULL;
     
+    series = calloc(1, sizeof(GrayScaleImageSeries));
+    if(series == NULL){
+        fprintf(stderr, "Couldn't allocate enough space!\n");
+        return NULL;
+    }
+
+    FILE *file = fopen(path, "rb");
+    if(file == NULL){
+        fprintf(stderr, "%s could not be opened!\n", path);
+        clearSeries(series);
+        return NULL;
+    }
+
+    //Schaue ob die erste Zeile der richtige Header ist.
+    char buffer[32];
+    size_t bytes = fread(buffer, sizeof(char), strlen(FILE_HEADER_STRING), file);
+    if(!strncmp(buffer, FILE_HEADER_STRING, strlen(FILE_HEADER_STRING))){
+        fprintf(stderr, "__info2_image_file_format__ not found!\n");
+        clearSeries(series);
+        return NULL;
+    }
+
+    if(bytes = fread(buffer, sizeof(short), 3, file) != (3*szieof(short))){
+        fprintf(stderr, "Couldn't read number of images/sizes of Images!\n");
+        clearSeries(series);
+        return NULL;
+    }
+
+    series->count = (short)buffer[0];
+    unsigned int width = (short)buffer[1];
+    unsigned int height = (short)buffer[2];
+
+    series->labels = calloc(count, sizeof(char));
+    if(series->labels == NULL){
+        fprintf(stderr, "calloc failed!\n");
+        clearSeries(series);
+        return NULL;
+    }
+
+    for (int i = 0; i < count; i++){
+        if(series->images[i] = readIndividualImage(width, heigth, file) == NULL){
+            clearSeries(series);
+            return NULL;
+        }
+        fread(series->labels[i], sizeof(char), 1, file);
+    }
+
     return series;
 }
 
 // TODO Vervollständigen Sie die Funktion clearSeries, welche eine Bildserie vollständig aus dem Speicher freigibt
 void clearSeries(GrayScaleImageSeries *series)
 {
+    for(int i = 0; i < series->count; i++){
+        free(series->GrayScaleImage[i]);
+    }
+    free(series);
 }