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Funktion aufgeteilt

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This commit is contained in:
Niklas Wolf 2025-11-17 22:01:19 +01:00
parent d3a79ff7bc
commit dca1d7a816
1 changed files with 130 additions and 70 deletions
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200
imageInput.c
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@ -43,106 +43,166 @@ static int checkHeader(const GrayScalePixelType *buffer){
}
static FILE *openImageFile(const char *path)
{
return fopen(path, "rb");
}
static int readHeaderFromFile(FILE *fp, GrayScalePixelType *headerBuffer)
{
if (fread(headerBuffer, sizeof(GrayScalePixelType),HEADER_LEN, fp) != HEADER_LEN)
{
return 0;
}
return 1;
}
static int readMetaData(FILE *fp, unsigned int *numImages, unsigned int *width, unsigned int *height)
{
if (fread(numImages, sizeof(unsigned int), 1, fp) != 1 || fread(width, sizeof(unsigned int), 1, fp) != 1 || fread(height, sizeof(unsigned int), 1, fp) != 1)
{
return 0;
}
return 1;
}
static GrayScaleImageSeries *allocateSeriesStruct(void)
{
GrayScaleImageSeries *series = malloc(sizeof(GrayScaleImageSeries));
return series;
}
static int allocateImageAndLabelArrays(GrayScaleImageSeries *series, unsigned int numImages, FILE *fp)
{
series->count = numImages;
//Speicher für die Pointer an sich belegen
series->images = malloc(numImages * sizeof(GrayScaleImage));
series->labels = malloc(numImages * sizeof(unsigned char));
if (!series->images || !series->labels)
{
free(series->images); //wenn trotzdem was reingeschrieben wurde, dann freigeben
free(series->labels);
free(series);
fclose(fp);
return 0;
}
return 1;
}
static int allocateBufferForImages(GrayScaleImageSeries *series, unsigned int numImages, unsigned int width, unsigned int height, FILE *fp)
{
for (unsigned int i = 0; i < numImages; i++)
{
series ->images[i].buffer = malloc(width * height);
if (series ->images[i].buffer == NULL)
{
for (unsigned int j = 0; j < i; j++)
{
free(series->images[j].buffer);
}
free(series->images);
free(series->labels);
free(series);
fclose(fp);
return 0;
}
}
return 1;
}
static int readImagesAndLabels(FILE *fp, GrayScaleImageSeries *series, unsigned int numImages, unsigned int width, unsigned int height)
{
for (unsigned int i = 0; i < numImages; i++)
{
series->images[i].width = width;
series->images[i].height = height;
if (fread(series->images[i].buffer, 1, width *height, fp) != (width * height))
{
clearSeries(series);
fclose(fp);
return 0;
}
fread(&series->labels[i], 1, 1, fp);
}
return 1;
}
// TODO Vervollständigen Sie die Funktion readImages unter Benutzung Ihrer Hilfsfunktionen
GrayScaleImageSeries *readImages(const char *path)
{
GrayScaleImageSeries *series = NULL;
FILE *fp = fopen(path, "rb"); //Datei im Binärmodus öffnen
if(!fp)
return NULL; //Fehler: Datei konnte nicht geöffnet werden
FILE *fp = openImageFile(path);
if (!fp)
return NULL;
//Buffer zum Einlesen des Headers
GrayScalePixelType header[HEADER_LEN];
//Prüfen, ob genau die HEADER_LEN Bytes eingelesen werden
if(fread(header, sizeof(GrayScalePixelType), HEADER_LEN, fp) != HEADER_LEN){
fclose(fp);
return NULL;
}
//Prüfen, ob es sich um den korrekten Header handelt mit Hilfsfunktion
if(!checkHeader(header)){
fclose(fp);
return NULL;
}
//Anzahl der Bilder, Breite und Höhe einlesen
unsigned int numImages, width, height;
if(fread(&numImages, sizeof(unsigned int), 1, fp) != 1 || fread(&width, sizeof(unsigned int), 1, fp) != 1 || fread(&height, sizeof(unsigned int), 1, fp)!= 1)
if (!readHeaderFromFile(fp, header))
{
fclose(fp);
return NULL;
}
if (!checkHeader(header))
{
fclose(fp);
return NULL;
}
unsigned int numImages, width, height;
if (!readMetaData(fp, &numImages, &width, &height))
{
fclos(fp);
return NULL;
}
if (!checkDimensions(width, height))
{
fclose(fp);
return NULL;
}
//Speicher für die gesamte Bildserie reservieren (aber nur für die Pointer und das count-Feld)
series = malloc(sizeof(GrayScaleImageSeries));
if(!series) {
series = allocateSeriesStruct();
if (!series)
{
free(series);
fclose(fp);
return NULL; //Fehler bei Speicherreservierung
}
series->count = numImages;
//Speicher für die Pointer an sich belegen
series->images = malloc(numImages * sizeof(GrayScaleImage));
series->labels = malloc(numImages * sizeof(unsigned char));
//Prüfen, ob der Speicher reserviert werden konnte
for(unsigned int i = 0; i < numImages; i++){
series -> images[i].buffer = malloc(width * height);
if(series->images[i].buffer == NULL){
for(unsigned int j = 0; j < i; j++){
free(series->images[j].buffer);
}
free(series->images); //wenn trotzdem was reingeschrieben wurde, dann freigeben
free(series->labels);
free(series);
fclose(fp);
return NULL;
}
}
for(int i = 0; i < numImages; i++)
{
series -> images[i].width = width;
series -> images[i].height = height;
if(fread(series -> images[i].buffer, 1, width * height, fp) != (width * height))
{
clearSeries(series);
fclose(fp);
return NULL;
}
fread(&series -> labels[i], 1, 1, fp);
if (!allocateImageAndLabelArrays(series, numImages, fp))
{
return NULL;
}
if (!allocateImageAndLabelImages(series, numImages, width, height, fp))
{
return NULL;
}
if (!readImagesAndLabels(fp, series, numImages, width, height))
{
return NULL;
}
return series;
}
}
// TODO Vervollständigen Sie die Funktion clearSeries, welche eine Bildserie vollständig aus dem Speicher freigibt
void clearSeries(GrayScaleImageSeries *series)
{
}
}