Merge remote-tracking branch 'origin/main'

Startcode/imageInput.c

@@ -6,17 +6,114 @@
 #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;
-    
+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;
+    unsigned int readcount = fread(&number, sizeof(unsigned short), 1, file);
+    if (readcount != 1) {
+        return 0;
+    }
+    return number;
+}
+// TODO:alles in innere Funktion äußere Funktion nur fopen / fclose
+
+// fillBuffer und readLabel muss immer in einer Schleife zusammen stehen
+static int fillBuffer(unsigned char buffer[], unsigned int bufferSize, FILE *file) {
+    unsigned int readcount = fread(buffer, sizeof(GrayScalePixelType), bufferSize, file);
+    if (readcount == 0) {
+        return 0;
+    }
+    return 1;
+}
+
+static int readLabels(FILE *file, unsigned char label[], unsigned int count) {
+    unsigned int readlabels = fread(label + count, sizeof(char), 1, file);
+    if (readlabels == 0) {
+        return 0;
+    }
+    return 1;
+}
+GrayScaleImageSeries *innerSeries(FILE*file) {
+    unsigned int count = readNumber(file);
+    unsigned int width = readNumber(file);
+    unsigned int height = readNumber(file);
+    if (width == 0 || height == 0 || count == 0) {
+        return NULL;
+    }
+    // Füllen des structs series
+    GrayScaleImageSeries *series = malloc(sizeof(GrayScaleImageSeries));
+    if (series == NULL) {
+        return NULL;
+    }
+
+    series->count = count;
+    series->labels = malloc(series->count * sizeof(unsigned char));
+    series->images = malloc(series->count * sizeof(GrayScaleImage));
+    if (series->labels == NULL || series->images == NULL) {
+        return NULL;
+    }
+
+    // struct grayScaleImage füllen als Teil eines Arrays innerhalb series
+    unsigned int const bufferSize = width * height;
+    for (unsigned int i = 0; i < series->count; i++) {
+
+        GrayScaleImage *grayScaleImage = &series->images[i];
+        grayScaleImage->buffer = calloc(bufferSize, width * height * sizeof(GrayScalePixelType));
+        if (grayScaleImage->buffer == NULL) {
+            return NULL;
+        }
+
+        grayScaleImage->width = width;
+        grayScaleImage->height = height;
+        int readBufferFault = fillBuffer(grayScaleImage->buffer, bufferSize, file);
+        int readLabelFault = readLabels(file, series->labels, i);
+        if (!readLabelFault || !readBufferFault) {
+            return NULL;
+        }
+    }
+
     return series;
 }
 
-// TODO Vervollständigen Sie die Funktion clearSeries, welche eine Bildserie vollständig aus dem Speicher freigibt
-void clearSeries(GrayScaleImageSeries *series)
-{
-}
+
+GrayScaleImageSeries *readImages(const char *path) {
+    FILE *file = fopen(path, "rb");
+    if (!controlFile(file)) {
+        return NULL;
+    }
+    GrayScaleImageSeries*address = innerSeries(file);
+    fclose(file);
+    if (address == NULL) {
+        return NULL;
+    }
+   return address;
+}
+
+
+
+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);
+    }
+    free(series);
+}

Startcode/imageInput.h

@@ -20,4 +20,5 @@ typedef struct
 GrayScaleImageSeries *readImages(const char *path);
 void clearSeries(GrayScaleImageSeries *series);
 
+
 #endif