124 lines
4.5 KiB
C
124 lines
4.5 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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//void setupMemory();
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unsigned int readStatusInfo(FILE *source, char *const headerString, unsigned int *const imageCount, unsigned int *const imageWidth, unsigned int *const imageHeight, int const amountToRead);
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void readImagedata(FILE *source, unsigned char *const imageBuffer, unsigned char *const labelBuffer,int const imageCount ,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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unsigned int numberOfBytesToRead = 0;
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const unsigned int amountOfStatusInfoToRead = 1;
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char headerString[sizeof("__info2_image_file_format__\0")] = "";
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//speicher allocaten weil *series auf null zeigt !!!!!!!!
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readSource = fopen(path, "rb");
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if (readSource != NULL)
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{
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series = calloc(sizeof(GrayScaleImageSeries), amountOfStatusInfoToRead);
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series->images = calloc(sizeof(GrayScaleImage), amountOfStatusInfoToRead);
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numberOfBytesToRead = readStatusInfo(readSource, headerString, &(series->count), &(series->images->width), &(series->images->height), amountOfStatusInfoToRead);
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series->images->buffer = calloc((series->count) * numberOfBytesToRead, sizeof(GrayScalePixelType));
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series->labels = calloc((series->count), sizeof(&(series->labels)));
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readImagedata(readSource, series->images->buffer, series->labels, series->count, numberOfBytesToRead);
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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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unsigned int readStatusInfo(FILE *source, char *const headerString, unsigned int *const imageCount, unsigned int *const imageWidth, unsigned int *const imageHeight, int const amountToRead)
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{
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unsigned int bytesToRead = 0;
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fread(headerString, sizeof("__info2_image_file_format__\0"), amountToRead, source);
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fread(imageCount, sizeof(int), 1, source);
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fread(imageWidth, sizeof(int), amountToRead, source);
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fread(imageHeight, sizeof(int), amountToRead, source);
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bytesToRead = (*imageWidth) * (*imageHeight);
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// state of debugging:
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// stopped here,
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// read width and height
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// return nonsensical numbers
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// is the sizeof() command correct??
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printf("hier\n");
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printf("stringsize: %lld\n", sizeof(headerString));
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printf("string: %send\n", headerString);
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printf("count: %u\n", *imageCount);
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printf("width: %u\n", *imageWidth);
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printf("height %u\n", *imageHeight);
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printf("bytes to read = %u\n", bytesToRead);
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return bytesToRead;
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}
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// reads the imagebytes and the label of all images
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void readImagedata(FILE *source, unsigned char *const imageBuffer, unsigned char *const labelBuffer,int const imageCount , int const amountOfBytes)
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{
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int i = 0;
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for (i = 0; i <= imageCount; i++)
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{
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fread((imageBuffer + i * amountOfBytes), sizeof(&(imageBuffer)), amountOfBytes, source);
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fread((labelBuffer + i), sizeof(&(labelBuffer)), 1, source);
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}
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}
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