imageInput implementiert

imageInput.c

@@ -7,11 +7,71 @@
 #define FILE_HEADER_STRING "__info2_image_file_format__"
 
 // TODO Implementieren Sie geeignete Hilfsfunktionen für das Lesen der Bildserie aus einer Datei
+static FILE* openAndReadShort (const char *path, unsigned short *count, unsigned short *width, unsigned short *height) {
+    FILE *file = fopen(path, "rb");
+    if (!file) {
+        perror("Konnte Datei nicht finden");
+        return NULL;
+    }
 
+    fread(count, sizeof(unsigned short), 1, file);
+    fread(width, sizeof(unsigned short), 1, file);
+    fread(height, sizeof(unsigned short), 1, file);
+
+    return file;
+}
+
+static GrayScaleImage* readPixles (FILE *file, unsigned short *width, unsigned short *height) {
+    GrayScaleImage *image = malloc (sizeof(GrayScaleImage));
+    image->width = *width;
+    image->height = *height;
+    image->buffer = malloc ((*width) * (*height) * sizeof(GrayScalePixelType));
+    if (!image->buffer) {
+        free(image);
+        return NULL;
+    }
+
+    for (unsigned int i = 0; i < (*width) * (*height); i++) {
+        unsigned char pixel;
+        if (fread(&pixel, sizeof(unsigned char), 1, file) != 1) {
+            free(image->buffer);
+            free(image);
+            return NULL;
+        }
+    image->buffer[i] = pixel;
+    }
+
+    return image;
+}
 // TODO Vervollständigen Sie die Funktion readImages unter Benutzung Ihrer Hilfsfunktionen
 GrayScaleImageSeries *readImages(const char *path)
 {
-    GrayScaleImageSeries *series = NULL;
+    unsigned short count = 0, width = 0, height = 0;
+
+    FILE *file = openAndReadShort(path, &count, &width, &height);
+
+    GrayScaleImageSeries *series = malloc(sizeof(GrayScaleImageSeries));
+    if (!series) {
+        fclose(file);
+        return NULL;
+    }
+    series->count = count;
+
+    series->images = malloc(count * sizeof(GrayScaleImage));
+    series->labels = malloc(count* sizeof(unsigned char));
+
+    for (unsigned int i = 0; i < series->count; i++) {
+       GrayScaleImage *image = readPixles(file, &width, &height);
+       series->images[i] = *image;
+       free(image);
+
+       if (fread(&series->labels[i], sizeof(unsigned char), 1, file) != 1) {
+            clearSeries(series); 
+            fclose(file); 
+            return NULL; 
+        }
+    }
+    fclose(file);
     
     return series;
 }
@@ -19,4 +79,10 @@ GrayScaleImageSeries *readImages(const char *path)
 // TODO Vervollständigen Sie die Funktion clearSeries, welche eine Bildserie vollständig aus dem Speicher freigibt
 void clearSeries(GrayScaleImageSeries *series)
 {
+    for (unsigned int i = 0; i < series->count; i++) {
+        free(series->images[i].buffer);
+    }
+    free(series->images);
+    free(series->labels);
+    free(series);
 }