80 lines
2.8 KiB
C
80 lines
2.8 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "imageInput.h"
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#define BUFFER_SIZE 100
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#define FILE_HEADER_STRING "__info2_image_file_format__"
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// TODO Implementieren Sie geeignete Hilfsfunktionen für das Lesen der Bildserie aus einer Datei
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int checkHeader(FILE* fileName)
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{
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char buffer[BUFFER_SIZE];
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fread(buffer,sizeof(char),strlen(FILE_HEADER_STRING),fileName);
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buffer[strlen(buffer)]='\0';
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if(strncmp(buffer,"__info2_image_file_format__",strlen(FILE_HEADER_STRING)) != 0)
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return 0;
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return 1;
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}
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//// TODO Vervollständigen Sie die Funktion readImages unter Benutzung Ihrer Hilfsfunktionen
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GrayScaleImageSeries *readImages(const char *path)
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{
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FILE* file = fopen(path,"rb");
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unsigned int width=0,height=0;
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GrayScaleImageSeries *imageSeries = malloc(sizeof(GrayScaleImageSeries));
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if (imageSeries ==NULL) {
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printf("Error allocating memory for GrayScaleImageSeries\n");
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return NULL;
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}
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imageSeries->count = 0;
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if(checkHeader(file) == 0) {
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fclose(file);
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return NULL;
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}
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fread(&imageSeries->count,sizeof(unsigned short),1,file);//Einlesen der Anzahl an Bildern
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imageSeries->images = (GrayScaleImage*)malloc(imageSeries->count * sizeof(GrayScaleImage));
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fread(&width,sizeof(unsigned short),1,file);//Einlesen der Breite
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fread(&height,sizeof(unsigned short),1,file);//Einlesen der Höhe
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imageSeries->labels = malloc(imageSeries->count * sizeof(unsigned char));
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if(imageSeries->labels == NULL) { //Wenn Speicher nicht reservierbar
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free(imageSeries);
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fclose(file);
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return NULL;
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}
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for(int i = 0; i < imageSeries->count; i++) {
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imageSeries->images[i].width = width; //Bilder Einlesen //Breite und Höhe immer gleich
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imageSeries->images[i].height = height;
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const unsigned int imageSize = height*width; //Anzahl Pixel insgesamt
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imageSeries->images[i].buffer = (GrayScalePixelType*) malloc(imageSize*sizeof(GrayScalePixelType));
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if(imageSeries->images[i].buffer == NULL) {
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free(imageSeries->images); //Falls speicher nicht reservierbar
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free(imageSeries);
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fclose(file);
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return NULL;
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}
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for (int j=0;j<imageSize;j++)
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{
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//Einlesen der Pixel
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fread(&imageSeries->images[i].buffer[j],sizeof(GrayScalePixelType),1,file);
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}
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fread(&imageSeries->labels[i],sizeof(unsigned char),1,file);//Einlesen des Labels
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}
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fclose(file);
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return imageSeries;
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}
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// TODO Vervollständigen Sie die Funktion clearSeries, welche eine Bildserie vollständig aus dem Speicher freigibt
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void clearSeries(GrayScaleImageSeries *series)
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{
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for (int i = 0; i < series->count; i++)
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{
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free(series->images[i].buffer);
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}
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free(series->images);
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free(series->labels);
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free(series);
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} |