fioxed errors that failed the first 4 tests - imageInput now done

imageInput.c

@@ -3,49 +3,71 @@
 #include <string.h>
 #include "imageInput.h"
 
-#define BUFFER_SIZE 100
 #define FILE_HEADER_STRING "__info2_image_file_format__"
+#define FILE_HEADER_LENGTH (sizeof(FILE_HEADER_STRING) - 1U)
 
-// TODO Implementieren Sie geeignete Hilfsfunktionen für das Lesen der Bildserie aus einer Datei
-
-// TODO Vervollständigen Sie die Funktion readImages unter Benutzung Ihrer Hilfsfunktionen
+// Reads an entire image series file and returns a heap-allocated descriptor.
 GrayScaleImageSeries *readImages(const char *path)
 {
-    GrayScaleImageSeries *series = NULL;
-
     FILE *file = fopen(path, "rb");
-
-    if(file != NULL)
+    if(file == NULL)
     {
-        if(checkFileHeader(file))
-        {
-            unsigned int numberOfImages = readDimension(file);
-            unsigned short int width = readDimension(file);
-            unsigned short int height = readDimension(file);
-            series = (GrayScaleImageSeries *)malloc(sizeof(GrayScaleImageSeries));
-            series->images = (GrayScaleImage *)malloc(numberOfImages * sizeof(GrayScaleImage));
-            series->labels = (unsigned char *)malloc(numberOfImages * sizeof(unsigned char));
-            series->count = numberOfImages;
-            for(unsigned int i = 0; i < numberOfImages; i++)
-            {
-                series->images[i] = readImage(file);
-                series->labels[i] = readLabel(file);
-            }
-            fclose(file);
-            return series;
-        }
+        return NULL;
     }
+
+    if(!checkFileHeader(file))
+    {
+        fclose(file);
+        return NULL;
+    }
+
+    unsigned int numberOfImages = readDimension(file);
+    unsigned short width = readDimension(file);
+    unsigned short height = readDimension(file);
+
+    GrayScaleImageSeries *series = (GrayScaleImageSeries *)malloc(sizeof(GrayScaleImageSeries));
+    if(series == NULL)
+    {
+        fclose(file);
+        return NULL;
+    }
+
+    series->images = (GrayScaleImage *)calloc(numberOfImages, sizeof(GrayScaleImage));
+    series->labels = (unsigned char *)calloc(numberOfImages, sizeof(unsigned char));
+    series->count = numberOfImages;
+
+    if(series->images == NULL || series->labels == NULL)
+    {
+        clearSeries(series);
+        fclose(file);
+        return NULL;
+    }
+
+    for(unsigned int i = 0; i < numberOfImages; i++)
+    {
+        series->images[i] = readImage(file, width, height);
+        series->labels[i] = readLabel(file);
+    }
+
+    fclose(file);
     return series;
 }
 
 
+// Validates and consumes the file header tag that identifies the custom format.
 bool checkFileHeader(FILE *file)
 {
-    char buffer[BUFFER_SIZE] = {0};
-    fread(buffer, sizeof(char), BUFFER_SIZE, file);
-    return strcmp(buffer, FILE_HEADER_STRING) == 0;
+    char buffer[FILE_HEADER_LENGTH + 1] = {0};
+    size_t bytesRead = fread(buffer, sizeof(char), FILE_HEADER_LENGTH, file);
+    if(bytesRead != FILE_HEADER_LENGTH)
+    {
+        return false;
+    }
+
+    return strncmp(buffer, FILE_HEADER_STRING, FILE_HEADER_LENGTH) == 0;
 }
 
+// Reads a single 16-bit dimension (width, height or count of Images) from the file.
 unsigned short int readDimension(FILE *file)
 {
     unsigned short int dimension = 0;
@@ -53,14 +75,24 @@ unsigned short int readDimension(FILE *file)
     return dimension;
 }
 
-GrayScaleImage readImage(FILE *file)
+// Reads a single grayscale image of the provided dimensions from the file.
+GrayScaleImage readImage(FILE *file, unsigned short width, unsigned short height)
 {
-    GrayScaleImage image;
-    image.buffer = (GrayScalePixelType *)malloc(image.width * image.height * sizeof(GrayScalePixelType));
-    fread(image.buffer, sizeof(GrayScalePixelType), image.width * image.height, file);
+    GrayScaleImage image = {0};
+    image.width = width;
+    image.height = height;
+
+    unsigned int pixelCount = (unsigned int)width * (unsigned int)height;
+    image.buffer = (GrayScalePixelType *)malloc(pixelCount * sizeof(GrayScalePixelType));
+    if(image.buffer != NULL)
+    {
+        fread(image.buffer, sizeof(GrayScalePixelType), pixelCount, file);
+    }
+
     return image;
 }
 
+// Reads one byte label that belongs to the preceding image.
 unsigned char readLabel(FILE *file)
 {
     unsigned char label = 0;
@@ -68,7 +100,7 @@ unsigned char readLabel(FILE *file)
     return label;
 }
 
-// TODO Vervollständigen Sie die Funktion clearSeries, welche eine Bildserie vollständig aus dem Speicher freigibt
+// Releases all heap allocations associated with a GrayScaleImageSeries.
 void clearSeries(GrayScaleImageSeries *series)
 {
     if (series != NULL)

imageInput.h

@@ -1,6 +1,9 @@
 #ifndef IMAGEINPUT_H
 #define IMAGEINPUT_H
 
+#include <stdbool.h>
+#include <stdio.h>
+
 typedef unsigned char GrayScalePixelType;
 
 typedef struct
@@ -22,7 +25,7 @@ GrayScaleImageSeries *readImages(const char *path);
 void clearSeries(GrayScaleImageSeries *series);
 bool checkFileHeader(FILE *file);
 unsigned short int readDimension(FILE *file);
-GrayScaleImage readImage(FILE *file);
+GrayScaleImage readImage(FILE *file, unsigned short width, unsigned short height);
 unsigned char readLabel(FILE *file);
 
 #endif

testFile.info2

@@ -1 +0,0 @@
-some_tag