From 8ab69dd403a140d136b64579f5625481a54ada0d Mon Sep 17 00:00:00 2001
From: Hofmann Jonas <hofmannjo99187@th-nuernberg.de>
Date: Thu, 20 Nov 2025 08:27:00 +0100
Subject: [PATCH] added function to check for correct header

---
 imageInput.c | 74 ++++++++++++++++++++++++++++++++++++++--------------
 1 file changed, 54 insertions(+), 20 deletions(-)

diff --git a/imageInput.c b/imageInput.c
index e11ebec..2a1b62e 100644
--- a/imageInput.c
+++ b/imageInput.c
@@ -13,6 +13,7 @@
 //void setupMemory();
 unsigned int readStatusInfo(FILE *source, char *const headerString, unsigned int *const imageCount, unsigned int *const imageWidth, unsigned int *const imageHeight, int const amountToRead);
 void readImagedata(FILE *source, unsigned char *const imageBuffer, unsigned char *const labelBuffer,int const imageCount ,int const amountToRead);
+unsigned int checkHeaderString(char header[]);
 
 
 // TODO Vervollständigen Sie die Funktion readImages unter Benutzung Ihrer Hilfsfunktionen
@@ -24,17 +25,19 @@ GrayScaleImageSeries *readImages(const char *path)
     FILE                    *readSource;
     unsigned int            numberOfBytesToRead         = 0;
     const unsigned int      amountOfStatusInfoToRead    = 1;
-    char                    headerString[sizeof("__info2_image_file_format__\0")] = "";
+    unsigned int            expectedHeader              = 0;
+    char                    headerString[sizeof(FILE_HEADER_STRING)] = "";
 
-    
+    /*
     char curChar = 0;
     int i = 0;
+    */
     
     readSource = fopen(path, "rb");
     
     if (readSource != NULL)
     {
-        
+        /*
             // print entire source char by char
             do
             {
@@ -48,22 +51,33 @@ GrayScaleImageSeries *readImages(const char *path)
                 i++;
             } while (curChar != EOF);
             // print entire source char by char
-        
+        */
         series                  = calloc(sizeof(unsigned int) + 3* sizeof(headerString),  amountOfStatusInfoToRead);
         series->images          = calloc(2*sizeof(unsigned int) + sizeof(headerString),  amountOfStatusInfoToRead);
         
-        numberOfBytesToRead = readStatusInfo(readSource, headerString, &(series->count), &(series->images->width), &(series->images->height), amountOfStatusInfoToRead);
+        numberOfBytesToRead     = readStatusInfo(readSource, headerString, &(series->count), &(series->images->width), &(series->images->height), amountOfStatusInfoToRead);
+        
+        
+        expectedHeader          = checkHeaderString(headerString);
+
+        if (expectedHeader)
+        {
+            series->images->buffer  = calloc((series->count) * numberOfBytesToRead, sizeof(GrayScalePixelType));
+            series->labels          = calloc((series->count),                       sizeof(&(series->labels)));
+            //printf("%d\n", series->images[0].width);
+            // series->images[1].width is not being set
+            // implement setting several amoundt of status info
+            // for when several images are bing read
+            // also adjust amoung of memory allocated for 
+            // staus info based on the number of images to be read
+            //printf("%d\n", series->images[1].width);
+            readImagedata(readSource, series->images->buffer, series->labels, series->count, numberOfBytesToRead);
+        }
+        else
+        {
+            printf("unexpected header!\n");
+        }
         
-        series->images->buffer  = calloc((series->count) * numberOfBytesToRead, sizeof(GrayScalePixelType));
-        series->labels          = calloc((series->count),                       sizeof(&(series->labels)));
-        printf("%d\n", series->images[0].width);
-        // series->images[1].width is not being set
-        // implement setting several amoundt of status info
-        // for when several images are bing read
-        // also adjust amoung of memory allocated for 
-        // staus info based on the number of images to be read
-        printf("%d\n", series->images[1].width);
-        readImagedata(readSource, series->images->buffer, series->labels, series->count, numberOfBytesToRead);
         
         fclose(readSource);
     }
@@ -110,17 +124,18 @@ unsigned int readStatusInfo(FILE *source, char *const headerString, unsigned int
 {
     unsigned int bytesToRead = 0;
     
+    /*
     int numred = 0;
     int numred2 = 0;
     int numred3 = 0;
     int numred4 = 0;
-    
+    */
 
     //unsigned int imageCountBuffer = 0;
-    numred = fread(headerString, 27,  1, source);
-    numred2 = fread(imageCount,   2,      1, source);
-    numred3 = fread(imageWidth,   2,     1, source);
-    numred4 = fread(imageHeight,  2,    1, source);
+    /*numred =*/ fread(headerString, 27,  1, source);
+    /*numred2 =*/ fread(imageCount,   2,      1, source);
+    /*numred3 =*/ fread(imageWidth,   2,     1, source);
+    /*numred4 =*/ fread(imageHeight,  2,    1, source);
 
     bytesToRead = (*imageWidth) * (*imageHeight);
     /*
@@ -150,3 +165,22 @@ void readImagedata(FILE *source, unsigned char *const imageBuffer, unsigned char
     }
 }
 
+unsigned int checkHeaderString(char header[])
+{
+    int i = 0;
+    int notIdenticall = 0;
+    char expectedHeader[sizeof(FILE_HEADER_STRING)] = FILE_HEADER_STRING;
+
+    for (i = 0; i < sizeof(FILE_HEADER_STRING); i++)
+    {
+        if (header[i] != expectedHeader[i])
+        {
+            notIdenticall = 1;
+            printf("%c != %C", header[i], expectedHeader[i]);
+        }
+        
+    }
+    
+    return !notIdenticall;
+}
+