generated from freudenreichan/info2Praktikum-NeuronalesNetz
121 lines
3.5 KiB
C
121 lines
3.5 KiB
C
#include <stdio.h>
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#include <stdint.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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/// @brief Gets the next char value from specified and opened file in the moment that is only ONE short int.
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/// @param openedFile stream FILE, from which to read
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static int getCharValueFromFile(FILE* openedFile) {
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int addToFile = 0;
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if (openedFile == NULL) return 0;
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addToFile = fgetc(openedFile);
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addToFile += fgetc(openedFile) * 256;
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return addToFile;
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}
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GrayScaleImageSeries* readImages(const char *path)
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{
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GrayScaleImageSeries *series = NULL;
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// uint16_t
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FILE* openFile;
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openFile = fopen(path, "rb");
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// file Could not be opened/does not exist
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if (openFile != NULL) {
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char* actualFileTag = malloc(strlen(FILE_HEADER_STRING)+1 * sizeof(char));
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int numberOfImages = 0;
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int width = 0;
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int height = 0;
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for (int i = 0; i < strlen(FILE_HEADER_STRING); i++) {
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char tmpFileChar = fgetc(openFile);
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if (tmpFileChar == EOF) {
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fclose(openFile);
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return NULL;
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}
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actualFileTag[i] = tmpFileChar;
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}
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actualFileTag[strlen(FILE_HEADER_STRING)] = '\0';
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// checks if the files are equal
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int fileTagEqual = strcmp(actualFileTag, FILE_HEADER_STRING);
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//we only need the fileTag to verify its an image for our series.
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free(actualFileTag);
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actualFileTag = NULL;
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//only if equal, the method continues
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if (fileTagEqual == 0) {
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numberOfImages = getCharValueFromFile(openFile);
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// no Images in series -> No image-series
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if (numberOfImages == 0) {
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fclose(openFile);
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return NULL;
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}
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width = getCharValueFromFile(openFile);
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height = getCharValueFromFile(openFile);
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// no height/width --> impossible file
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if(height == 0 || width == 0) {
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fclose(openFile);
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return NULL;
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}
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//all the starting parameters are set --> the images can be read and stored
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series = malloc(sizeof(GrayScaleImageSeries));
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series->count = 0;
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series->images = malloc(numberOfImages * sizeof(GrayScaleImage));
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series->labels = malloc(numberOfImages * sizeof(unsigned char));
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for (int i = 0; i < numberOfImages; i++) {
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series->images[i].height = height;
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series->images[i].width = width;
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series->images[i].buffer = malloc(width * height);
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for (int j = 0; j < (width * height); j++) {
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// allocating the actual matrix image for image
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series->images[i].buffer[j] = fgetc(openFile);
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}
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//rest of the values that only affect the image itself
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series->labels[i] = fgetc(openFile);
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series->count++;
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}
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}
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// the fclose happens here, since every other path closes the file beforehand
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fclose (openFile);
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}
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return series;
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}
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void clearSeries(GrayScaleImageSeries *series)
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{
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if (series == NULL) return;
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for (int i = 0; i < series->count; i++) {
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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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free(series->labels);
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series->labels = NULL;
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free(series);
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series = NULL;
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} |