91 lines
2.8 KiB
C
91 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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// DONE: Implementieren Sie geeignete Hilfsfunktionen für das Lesen der Bildserie aus einer Datei
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static unsigned short readUShort(FILE *file) {
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unsigned short value = 0;
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if (fread(&value, sizeof(unsigned short), 1, file) != 1) {
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return 0;
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}
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return value;
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}
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// DONE: 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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GrayScaleImageSeries *series = NULL;
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FILE *file = fopen(path, "rb"); // "rb" ist wichtig für Windows!
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if (file == NULL) {
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return NULL;
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}
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// Header prüfen
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char headerBuffer[BUFFER_SIZE] = {0};
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size_t headerLen = strlen(FILE_HEADER_STRING);
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if (fread(headerBuffer, sizeof(char), headerLen, file) != headerLen ||
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strcmp(headerBuffer, FILE_HEADER_STRING) != 0) {
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fclose(file);
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return NULL;
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}
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// Metadaten lesen
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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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// Speicher für die Serie reservieren
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series = (GrayScaleImageSeries*)calloc(1, sizeof(GrayScaleImageSeries));
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if (series == NULL) { fclose(file); return NULL; }
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series->count = count;
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series->images = (GrayScaleImage*)calloc(count, sizeof(GrayScaleImage));
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series->labels = (unsigned char*)calloc(count, sizeof(unsigned char));
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if (series->images == NULL || series->labels == NULL) {
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clearSeries(series);
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fclose(file);
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return NULL;
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}
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// Bilder und Labels lesen
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unsigned int pixelCount = width * height;
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for (unsigned int i = 0; i < count; i++) {
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series->images[i].width = width;
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series->images[i].height = height;
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series->images[i].buffer = (GrayScalePixelType*)malloc(pixelCount * sizeof(GrayScalePixelType));
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if (series->images[i].buffer != NULL) {
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fread(series->images[i].buffer, sizeof(GrayScalePixelType), pixelCount, file);
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}
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fread(&series->labels[i], sizeof(unsigned char), 1, file);
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}
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fclose(file);
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return series;
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}
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// DONE: 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 != NULL) {
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if (series->images != NULL) {
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for (unsigned int i = 0; i < series->count; i++) {
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if (series->images[i].buffer != NULL) {
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free(series->images[i].buffer);
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}
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}
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free(series->images);
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}
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if (series->labels != NULL) {
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free(series->labels);
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}
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free(series);
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}
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} |