initiate Neuronales_Netz

Neuronales_Netz/imageInput.c

@@ -6,17 +6,157 @@
 #define BUFFER_SIZE 100
 #define FILE_HEADER_STRING "__info2_image_file_format__"
 
+
+
 // TODO Implementieren Sie geeignete Hilfsfunktionen für das Lesen der Bildserie aus einer Datei
 
 // TODO Vervollständigen Sie die Funktion readImages unter Benutzung Ihrer Hilfsfunktionen
 GrayScaleImageSeries *readImages(const char *path)
 {
-    GrayScaleImageSeries *series = NULL;
+    FILE* file = fopen(path, "rb");
+    
+    if(file == NULL) 
+    {
+        puts("could not open file.");
+
+        return NULL;
+    }
+
+    if(!checkFileHeaderString(file))
+    {
+        puts("wrong File.");
+
+        return NULL;
+    }
+
+    unsigned short count = getCount(file);
+    if(!count)
+    {
+        puts("could not read number of images.");
+
+        return NULL;
+    }
+
+    unsigned short width = getWidth(file);
+    if(!width)
+    {
+        puts("could not read Width of images.");
+
+        return NULL;
+    }
+
+    unsigned short height = getHeight(file);
+    if(!height)
+    {
+        puts("could not read height of images.");
+
+        return NULL;
+    }
+
+    GrayScaleImageSeries *series = createSeries(count);
+
+    series->count = count;
+    unsigned short resolution = width * height;
+
+    for(unsigned int i = 0; i < series->count; i++)
+    {
+        series->images[i].width = width;
+        series->images[i].height = height;
+
+        series->images[i].buffer = getPixels(file, resolution);
+        series->labels[i] = getLabel(file);
+    }
+
+    fclose(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->images[i].buffer);
+    }
+
+    free(series->images);
+    free(series->labels);
+    free(series);
+}
+
+
+int checkFileHeaderString(FILE *file)
 {
+    char buffer[strlen(FILE_HEADER_STRING)];
+
+    fread(buffer, sizeof(char), strlen(FILE_HEADER_STRING), file);
+
+    for(int i = 0; i < strlen(FILE_HEADER_STRING); i++)
+    {
+        if(buffer[i] != FILE_HEADER_STRING[i])
+        {
+            return 0;
+        }
+    }
+    return 1;
+}
+
+unsigned short getCount(FILE *file)
+{
+    unsigned short count = 0;
+
+    fread(&count, sizeof(unsigned short), 1, file);
+
+    return count;
+}
+
+unsigned short getWidth(FILE *file)
+{
+    unsigned short width = 0;
+
+    fread(&width, sizeof(unsigned short), 1, file);
+
+    return width;
+}
+
+unsigned short getHeight(FILE *file)
+{
+    unsigned short height = 0;
+
+    fread(&height, sizeof(unsigned short), 1, file);
+
+    return height;
+}
+
+GrayScaleImageSeries *createSeries(unsigned short count)
+{
+    GrayScaleImage *images = (GrayScaleImage*) calloc(count, sizeof(GrayScaleImage));
+    unsigned char *labels = (unsigned char*) calloc(count, sizeof(unsigned char));
+
+    GrayScaleImageSeries *series = (GrayScaleImageSeries*) calloc(1, sizeof(GrayScaleImageSeries));
+    series->images = images;
+    series->labels = labels;
+
+    return series;
+}
+
+GrayScalePixelType *getPixels(FILE *file, unsigned short resolution)
+{
+    GrayScalePixelType *pixels = (GrayScalePixelType*) calloc(resolution, sizeof(GrayScalePixelType));
+
+    fread(pixels, sizeof(GrayScalePixelType), resolution, file);
+
+    return pixels;
+}
+
+unsigned char getLabel(FILE *file)
+{
+    unsigned char label = '\0';
+
+    fread(&label, sizeof(unsigned char), 1, file);
+
+    return label;
 }