105 lines
2.8 KiB
C
105 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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//Hilfsfunktion Header prüfen
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static int checkHeader(FILE *file) {
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char buffer[100];
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if (fgets(buffer, sizeof(buffer), file) == NULL)
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return 0;
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buffer[strcspn(buffer, "\r\n")] = 0;
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return strcmp(buffer,FILE_HEADER_STRING ) == 0;
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}
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//Hilfsfkt. 2 Bytes als unsigned short lesen (littel Endian)
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static unsigned short readUShort(FILE *file) {
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unsigned char bytes[2];
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fread(bytes, 1, 2, file);
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return (bytes[1] << 8) | bytes[0]; // Little Endian
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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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if (!file) return NULL;
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if (!checkHeader(file)) {
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fclose(file);
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return NULL;
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}
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unsigned short count = readUShort(file);
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unsigned short width = readUShort(file);
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unsigned short height = readUShort(file);
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if (count == 0 || width == 0 || height == 0) {
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fclose(file);
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return NULL;
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}
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GrayScaleImageSeries *series = malloc(sizeof(GrayScaleImageSeries));
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if (!series) { fclose(file); return NULL; }
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series->count = count;
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series->labels = malloc(count * sizeof(unsigned char));
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series->images = malloc(count * sizeof(GrayScaleImage));
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if (!series->labels || !series->images) {
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fclose(file);
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free(series->labels);
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free(series->images);
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free(series);
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return NULL;
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}
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for (unsigned int i = 0; i < count; i++) {
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GrayScaleImage *img = &series->images[i];
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img->width = width;
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img->height = height;
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img->buffer = malloc(width * height * sizeof(GrayScalePixelType));
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if (!img->buffer) {
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fclose(file);
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clearSeries(series);
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return NULL;
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}
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if (fread(img->buffer, sizeof(GrayScalePixelType), width * height, file) != width * height) {
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fclose(file);
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clearSeries(series);
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return NULL;
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}
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if (fread(&series->labels[i], sizeof(unsigned char), 1, file) != 1) {
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fclose(file);
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clearSeries(series);
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return NULL;
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}
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}
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fclose(file);
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return series;
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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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if (!series) return;
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for (unsigned int i = 0; i < series->count; i++) {
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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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}
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