generated from freudenreichan/info2Praktikum-NeuronalesNetz
78 lines
2.6 KiB
C
78 lines
2.6 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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int checkString (FILE *file){ //Checks if String at the start of File equals expected Format (0 for wrong 1 for right)
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if (file == NULL){ //returns 0 for empty file
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return 0;
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}
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char expectedString[] = FILE_HEADER_STRING;
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char actualString[BUFFER_SIZE];
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rewind(file);
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size_t bytesRead = fread(actualString, 1,27 , file); //Stores Bytes of start of File to actualString
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if (bytesRead != 27){
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return 0;} //Returns 0 if File is to short
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actualString[27] = '\0';
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if (strcmp(actualString, expectedString) != 0){
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return 0;
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}
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else{
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return 1;
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}
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}
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void setParameters(FILE* file, unsigned int* imageCount, unsigned int* width, unsigned int* height);
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void allocateMemory(GrayScaleImageSeries *s, const int imageCount, const int width, const int height);
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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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// TODO open binary file from file name
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GrayScaleImageSeries *series = NULL;
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if(!(checkString(file)))
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return NULL;
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unsigned int* imageCount = &(series->count); // sets a pointer for int variable count in struct
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setParameters(file, imageCount, &(series->images->width), &(series->images->height));
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allocateMemory(series, *imageCount, series->images->width, series->images->height);
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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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for(size_t i = series->count - 1; i >= 0; i--)
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{
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free(series->images+series->count*sizeof(GrayScaleImage)*i);
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free(series->labels+series->count*sizeof(unsigned char)*i);
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}
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series->images = NULL;
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series->labels = NULL;
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}
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void setParameters(FILE* file, unsigned int* imageCount, unsigned int* width, unsigned int* height) { // sets the parameters
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char buffer[3];
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fseek(file, 27, SEEK_SET);
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fread(buffer, 1, 3, file);
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*imageCount = (int) buffer[0];
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*width = (int) buffer[1];
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*height = (int) buffer[2];
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}
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// change this to createMatrix?
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void allocateMemory(GrayScaleImageSeries* s, const int imageCount, const int width, const int height) {
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for (int i = 0; i < imageCount; i++) {
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s->images[i].buffer = (unsigned char *) malloc(width * height * sizeof(unsigned char)); // allocates memory for every image in the series
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}
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} |