106 lines
3.8 KiB
C
106 lines
3.8 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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// Funktionen müssen noch auf Teilfunktionen
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// übersichtlich aufgeteilt werden!
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// TODO Implementieren Sie geeignete Hilfsfunktionen für das Lesen der Bildserie aus einer Datei
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int readStatusInfo(FILE **source, char *const headerString, int *const imageCount, int *const imageWidth, int *const imageHeight, int const amountToRead);
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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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GrayScaleImageSeries *series = NULL;
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// selbst geschriebene Variablen
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FILE *readSource;
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int i = 0;
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unsigned int numberOfBytesToRead = 0;
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const unsigned int amountOfStatusInfoToRead = 1;
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char headerString[sizeof("__info2_image_file_format__")];
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readSource = fopen(path, "rb");
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if (readSource != NULL)
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{
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numberOfBytesToRead = readStatusInfo(&readSource, headerString, &series->count, &series->images->width, &series->images->height, amountOfStatusInfoToRead);
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// bufferspeicher anlegen der unsigned char pointer
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// mit anzahl der pixel als größe ist um dann
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// grauwerte in diesen buffer zu schreiben
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// (grayscale pixeltype in grayscale image series)
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series->images->buffer = calloc((series->count) * numberOfBytesToRead, sizeof(GrayScalePixelType));
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// zusätzlich auch speicher anlegen der für die labels da ist
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series->labels = calloc((series->count), sizeof(&(series->labels)));
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// AB HIER Schleife die für
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// anzahl der Bilder je die Bytes und das Label einließt
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for (i = 0; i <= (series->count); i++)
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{
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fread((series->images->buffer + i * numberOfBytesToRead), sizeof(&(series->images->buffer)), numberOfBytesToRead, readSource);
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fread((series->labels + i), sizeof(&(series->labels)), amountOfStatusInfoToRead, readSource);
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}
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}
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fclose(readSource);
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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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int i = 0;
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// Write NULL into all memory spaces
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for (i = 0; i < ((series->count) * (series->images->width) * (series->images->height)); i++)
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{
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*(series->images->buffer + i * (series->images->width) * (series->images->height)) = '\0';
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}
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for (i = 0; i < (series->count); i++)
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{
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*(series->labels + i) = '\0';
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}
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series->count = 0;
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series->images->width = 0;
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series->images->height = 0;
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// Closse all allocated memory
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// AND write NULL into every pointer
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// so they can't be accessed
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free(series->images->buffer);
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free(series->labels);
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series->images->buffer = NULL;
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series->images = NULL;
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series->labels = NULL;
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free(series);
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series = NULL;
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}
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// reads string, pictureCount, pictureWidth, pictureHight
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int readStatusInfo(FILE **source, char *const headerString, int *const imageCount, int *const imageWidth, int *const imageHeight, int const amountToRead)
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{
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int bytesToRead = 0;
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fread(headerString, sizeof(*headerString), amountToRead, *source);
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fread(imageCount, sizeof(*imageCount), amountToRead, *source);
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fread(imageWidth, sizeof(*imageWidth), amountToRead, *source);
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fread(imageHeight, sizeof(*imageHeight), amountToRead, *source);
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bytesToRead = (*imageWidth) * (*imageHeight);
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return bytesToRead;
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}
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