Merge branch 'main' of https://git.efi.th-nuernberg.de/gitea/bruennerda98937/info2NeuronalesNetzBruennnerKobNew

imageInput.c

@@ -6,17 +6,110 @@
 #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
+
+/// @brief Gets the next char value from specified and opened file
+/// @param openedFile stream FILE, from which to read
+/// @param iterations how many chars are being taken from (1 char equals 2 Hexdecimals equals 8bit)
+static int getCharValueFromFile(FILE* openedFile, int iterations) {
+    int addToFile = 0;
+
+    if (openedFile == NULL) return 0;
+
+    for (int i = 0; i < iterations; i++) {
+        int tmp = fgetc(openedFile);
+        //If the File ends, the method returns a '0'
+        if (openedFile == EOF) return addToFile;
+
+        addToFile += tmp; 
+    }
+
+    return addToFile;
+}
 
 // TODO Vervollständigen Sie die Funktion readImages unter Benutzung Ihrer Hilfsfunktionen
 GrayScaleImageSeries *readImages(const char *path)
 {
     GrayScaleImageSeries *series = NULL;
-    
+
+    FILE* openFile;
+
+    openFile = fopen(path, "rb");
+
+    // file Could not be opened/does not exist
+    if (openFile != NULL) {
+
+         char* actualFileTag = malloc(strlen(FILE_HEADER_STRING) * sizeof(char));
+         int numberOfImages = 0;
+         int width = 0;
+         int height = 0;
+
+        for (int i = 0; i < strlen(FILE_HEADER_STRING); i++) {
+            actualFileTag += fgetc(openFile);
+        }
+
+        // checks if the files are equal: strcmp should return '0' --> convert it to '1' for 'true'
+        int fileTagEqual = !strcmp(actualFileTag, FILE_HEADER_STRING);
+
+        //we only need the fileTag to verify its an image for our series.
+        free(actualFileTag);
+        actualFileTag = NULL;
+
+
+        if (fileTagEqual) {
+            numberOfImages = getCharValueFromFile(openFile, 2);
+
+            // no Images in series -> No image-series
+            if (numberOfImages == 0) {
+                fclose(openFile);
+                return series;
+            }
+
+            width  = getCharValueFromFile(openFile, 2);
+            height = getCharValueFromFile(openFile, 2);
+
+            // no height/width --> impossible file 
+            if(height == 0 || width == 0) {
+                fclose(openFile);
+                return series;
+            }
+
+            //all the starting parameters are set --> the images can be read and stored
+            GrayScaleImage* images = malloc(numberOfImages * sizeof(GrayScaleImage));
+            unsigned char* labels = malloc(numberOfImages * sizeof(unsigned char));
+
+            series->count = 0;
+            series->images = images;
+            series->labels = labels;
+
+            for (int i = 0; i < numberOfImages; i++) {
+                for (int j = 0; j < width * height; j++) {
+                    // allocating the actual matrix image for image
+                    images[i].buffer = malloc(width * height);
+
+                    images[i].height = height;
+                    images[i].width = width;
+                    images[i].buffer[j] = fgetc(openFile);
+                }
+                //rest of the values that only affect the image itself
+                series->labels[i] = fgetc(openFile);
+                series->count++;
+            }
+        }
+    }
+
+    fclose(openFile);
     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);
+    series->images = NULL;
+    free(series->labels);
+    series->labels = NULL;
 }