Implement ImageInput

Startcode/imageInput.c

@@ -6,17 +6,89 @@
 #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;
-    
-    return series;
+static int controlFile(FILE *file) {
+    if (file == NULL) {
+        return 0;
+    }
+    char buffer[BUFFER_SIZE];
+    fread(buffer, sizeof(char), strlen(FILE_HEADER_STRING), file);
+    buffer[strlen(FILE_HEADER_STRING)] = '\0';
+    return !strcmp(FILE_HEADER_STRING, buffer);
+}
+
+static unsigned int readNumber(FILE *file) {
+    unsigned int number = 0;
+    fread(&number, sizeof(unsigned short), 1, file);
+    return number;
+}
+
+
+// fillBuffer und readLabel muss immer in einer Schleife zusammen stehen
+static int fillBuffer(unsigned char buffer[], unsigned int bufferSize, FILE *file) {
+        int readcount = fread(buffer, sizeof(GrayScalePixelType), bufferSize, file);
+        if (readcount == 0)
+            return 0;
+    return 1;
+}
+
+static void readLabels(FILE *file, unsigned char label[], unsigned int count) {
+    fread(label + count, sizeof(char), 1, file);
+}
+
+
+GrayScaleImageSeries *readImages(const char *path) {
+    FILE *file = fopen(path, "rb");
+
+    if (!controlFile(file)) {
+        return NULL;
+    }
+    GrayScaleImageSeries *firstSeries = malloc(sizeof(GrayScaleImageSeries));
+    firstSeries ->count = readNumber(file);
+    unsigned int width = readNumber(file);
+    unsigned int height = readNumber(file);
+
+    firstSeries ->labels = malloc(firstSeries ->count*sizeof(unsigned char));
+    firstSeries ->images = malloc(firstSeries ->count*sizeof(GrayScaleImage));
+    firstSeries ->addrSourceTxt = file;
+    if (firstSeries ->labels == NULL || firstSeries ->images == NULL) {
+        return NULL;
+    }
+    int fault = 1;
+    unsigned int const bufferSize = width * height;
+    for (unsigned int i = 0; i < firstSeries ->count && fault; i++)
+    {
+        GrayScaleImage *grayScaleImage = &firstSeries ->images[i];
+        grayScaleImage ->buffer = malloc(width * height*sizeof(GrayScalePixelType));
+        grayScaleImage ->width = width;
+        grayScaleImage -> height = height;
+        if (width == 0 || height == 0 || firstSeries ->count == 0) { // prüfen ob eingabe richtig ist
+            return NULL;
+        }
+
+        fault = fillBuffer(grayScaleImage ->buffer, bufferSize, file);
+        readLabels(file, firstSeries ->labels, i);
+    }
+
+    return firstSeries;
+}
+
+
+void clearSeries(GrayScaleImageSeries *series) {
+    if (series == NULL) {return;}
+    if (series->images != NULL) {
+        for (unsigned int i = 0; i < series->count; i++) {
+            const GrayScaleImage image = series->images[i];
+            if (image.buffer != NULL) {
+                free(image.buffer);
+            }
+        }
+        free(series->images);
+    }
+    if (series->labels != NULL) {
+        free(series->labels);
+    }
+    fclose(series->addrSourceTxt);
+    free(series);
 }
 
-// TODO Vervollständigen Sie die Funktion clearSeries, welche eine Bildserie vollständig aus dem Speicher freigibt
-void clearSeries(GrayScaleImageSeries *series)
-{
-}

Startcode/imageInput.h

@@ -15,9 +15,11 @@ typedef struct
     GrayScaleImage *images;
     unsigned char *labels;
     unsigned int count;
+    FILE *addrSourceTxt; // um in clearSeries den Text schließen zu können
 } GrayScaleImageSeries;
 
 GrayScaleImageSeries *readImages(const char *path);
 void clearSeries(GrayScaleImageSeries *series);
 
+
 #endif