123 lines
3.1 KiB
C
123 lines
3.1 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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/* ---------------- Hilfsfunktionen ---------------- */
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static int readHeader(FILE *file, unsigned short *count, unsigned short *width, unsigned short *height)
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{
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unsigned short headerlength = strlen(FILE_HEADER_STRING);
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char buffer[headerlength + 1];
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if (fread(buffer, 1, headerlength, file) != headerlength)
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return 0;
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buffer[headerlength] = '\0';
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if (strcmp(buffer, FILE_HEADER_STRING) != 0)
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return 0;
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if (fread(count, sizeof(unsigned short), 1, file) != 1)
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return 0;
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if (fread(width, sizeof(unsigned short), 1, file) != 1)
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return 0;
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if (fread(height, sizeof(unsigned short), 1, file) != 1)
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return 0;
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return 1;
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}
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static int readSingleImage(FILE *file, GrayScaleImage *image)
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{
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unsigned int pixelCount = image->width * image->height;
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if (fread(image->buffer, sizeof(GrayScalePixelType), pixelCount, file) != pixelCount)
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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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if (!file)
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return NULL;
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unsigned short count, width, height;
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if (!readHeader(file, &count, &width, &height)) {
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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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series->count = count;
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series->images = malloc(count * sizeof(GrayScaleImage));
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series->labels = malloc(count * sizeof(unsigned char));
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if (!series || !series->images || !series->labels)
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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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fclose(file);
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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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{
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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 = malloc(width * height * sizeof(GrayScalePixelType));
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//malloc prüfen
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if (!series->images[i].buffer)
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{
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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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//Image einlesen + prüfen
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if (!readSingleImage(file, &series->images[i])) {
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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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// label einlesen
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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)
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{
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for(unsigned 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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}
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} |