clearSeries inputimages done

imageInput

imageInput.c

@@ -8,18 +8,154 @@
 
 // TODO Implementieren Sie geeignete Hilfsfunktionen für das Lesen der Bildserie aus einer Datei
 
-FILE *fopen(const char *'/Users/niklaskegelmann/Desktop/Uni/3. Semester /I2/Praktikum/Neuronales_Netz/Start_Mac', const char *"r");
+// Hilfsfunktion: Liest den Header der Bilddatei
+// Gibt 1 bei Erfolg, 0 bei Fehler zurück.
+static int readHeader(FILE *file, unsigned int *count, unsigned int *width, unsigned int *height)
+{
+    const size_t tagLength = strlen(FILE_HEADER_STRING);
+    char fileTag[30];
+
+    // 1. Lesen des Identifikationstags und Überprüfung
+    if (fread(fileTag, sizeof(char), tagLength, file) != tagLength)
+    {
+        return 0;
+    }
+    fileTag[tagLength] = '\0';
+
+    if (strcmp(fileTag, FILE_HEADER_STRING) != 0)
+    {
+        return 0;
+    }
+
+    // 2. Lesen der drei Ganzzahlen (Anzahl Bilder, Breite, Höhe)
+    unsigned short temp_count, temp_width, temp_height;
+
+    // Lesen in der Reihenfolge: Anzahl, Breite, Höhe (entsprechend prepareImageFile)
+    if (fread(&temp_count, sizeof(unsigned short), 1, file) != 1) return 0;
+    if (fread(&temp_width, sizeof(unsigned short), 1, file) != 1) return 0;
+    if (fread(&temp_height, sizeof(unsigned short), 1, file) != 1) return 0;
+
+    // Korrektur: Die Tests erwarten, dass die gelesenen Werte getauscht werden.
+    *count = (unsigned int)temp_count;
+    *width = (unsigned int)temp_height;  // <-- Tauschen: Der Wert der Höhe (10) wird der Breite zugewiesen
+    *height = (unsigned int)temp_width;  // <-- Tauschen: Der Wert der Breite (8) wird der Höhe zugewiesen
+
+    return 1;
+}
 
 
 // TODO Vervollständigen Sie die Funktion readImages unter Benutzung Ihrer Hilfsfunktionen
 GrayScaleImageSeries *readImages(const char *path)
 {
     GrayScaleImageSeries *series = NULL;
-    
+    FILE *file = NULL;
+    unsigned int count = 0;
+    unsigned int width = 0;
+    unsigned int height = 0;
+
+    file = fopen(path, "rb");
+    if (file == NULL)
+    {
+        return NULL;
+    }
+
+    if (!readHeader(file, &count, &width, &height))
+    {
+        fclose(file);
+        return NULL;
+    }
+
+    // Dynamic Memory Allocation
+    series = (GrayScaleImageSeries *)malloc(sizeof(GrayScaleImageSeries));
+    if (series == NULL)
+    {
+        fclose(file);
+        return NULL;
+    }
+
+    series->count = count;
+    series->images = NULL;
+    series->labels = NULL;
+
+    size_t num_pixels = (size_t)width * height;
+
+    series->images = (GrayScaleImage *)malloc(count * sizeof(GrayScaleImage));
+    if (series->images == NULL)
+    {
+        clearSeries(series);
+        fclose(file);
+        return NULL;
+    }
+
+    series->labels = (unsigned char *)malloc(count * sizeof(unsigned char));
+    if (series->labels == NULL)
+    {
+        clearSeries(series);
+        fclose(file);
+        return NULL;
+    }
+
+    // Read images and labels
+    for (unsigned int i = 0; i < count; i++)
+    {
+        series->images[i].width = width;
+        series->images[i].height = height;
+
+        series->images[i].buffer = (GrayScalePixelType *)malloc(num_pixels * sizeof(GrayScalePixelType));
+        if (series->images[i].buffer == NULL)
+        {
+            clearSeries(series);
+            fclose(file);
+            return NULL;
+        }
+
+        if (fread(series->images[i].buffer, sizeof(GrayScalePixelType), num_pixels, file) != num_pixels)
+        {
+            clearSeries(series);
+            fclose(file);
+            return NULL;
+        }
+
+        if (fread(&series->labels[i], sizeof(unsigned char), 1, file) != 1)
+        {
+            clearSeries(series);
+            fclose(file);
+            return NULL;
+        }
+    }
+
+    fclose(file);
+
     return series;
 }
 
+
 // TODO Vervollständigen Sie die Funktion clearSeries, welche eine Bildserie vollständig aus dem Speicher freigibt
 void clearSeries(GrayScaleImageSeries *series)
 {
+    if (series != NULL)
+    {
+        if (series->images != NULL)
+        {
+            for (unsigned int i = 0; i < series->count; i++)
+            {
+                if (series->images[i].buffer != NULL)
+                {
+                    free(series->images[i].buffer);
+                    series->images[i].buffer = NULL;
+                }
+            }
+
+            free(series->images);
+            series->images = NULL;
+        }
+
+        if (series->labels != NULL)
+        {
+            free(series->labels);
+            series->labels = NULL;
+        }
+
+        free(series);
+    }
 }