121 lines
3.1 KiB
C
121 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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// -----------------------------------------------------
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// Hilfsfunktion: Überprüft den Header der Datei
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// -----------------------------------------------------
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static int checkFileHeader(FILE *file)
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{
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char buffer[BUFFER_SIZE] = {0};
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size_t headerLen = strlen(FILE_HEADER_STRING);
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if (fread(buffer, sizeof(char), headerLen, file) != headerLen)
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return 0;
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return (strncmp(buffer, FILE_HEADER_STRING, headerLen) == 0);
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}
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// -----------------------------------------------------
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// Funktion: Liest die Bilder aus einer Datei
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// -----------------------------------------------------
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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 (!checkFileHeader(file))
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{
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fclose(file);
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return NULL;
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}
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unsigned short numberOfImages = 0, width = 0, height = 0;
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// Đọc metadata: numberOfImages, height, width (theo cách test ghi)
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if (fread(&numberOfImages, sizeof(unsigned short), 1, file) != 1 ||
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fread(&height, sizeof(unsigned short), 1, file) != 1 ||
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fread(&width, sizeof(unsigned short), 1, file) != 1)
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{
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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)
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{
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fclose(file);
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return NULL;
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}
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series->count = numberOfImages;
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series->images = calloc(numberOfImages, sizeof(GrayScaleImage));
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series->labels = calloc(numberOfImages, sizeof(unsigned char));
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if (!series->images || !series->labels)
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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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for (unsigned short i = 0; i < numberOfImages; 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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unsigned int pixelCount = width * height;
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series->images[i].buffer = malloc(pixelCount * sizeof(GrayScalePixelType));
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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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if (fread(series->images[i].buffer, sizeof(GrayScalePixelType), pixelCount, file) != pixelCount ||
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fread(&series->labels[i], sizeof(unsigned char), 1, file) != 1)
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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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}
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fclose(file);
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return series;
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}
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// -----------------------------------------------------
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// Funktion: Gibt eine Bildserie vollständig frei
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// -----------------------------------------------------
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void clearSeries(GrayScaleImageSeries *series)
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{
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if (!series)
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return;
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if (series->images)
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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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series->images[i].buffer = NULL;
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}
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free(series->images);
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series->images = NULL;
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}
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if (series->labels)
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{
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free(series->labels);
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series->labels = NULL;
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}
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free(series);
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}
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