Neuronalesnetz/imageInput.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "imageInput.h"

#define BUFFER_SIZE 100
#define FILE_HEADER_STRING "__info2_image_file_format__"


// Tests passed
//      Rethink logic
//      Cleanup Programm
//      merge with others to test in entirity





// Funktionen müssen noch auf Teilfunktionen 
// übersichtlich aufgeteilt werden!

// TODO Implementieren Sie geeignete Hilfsfunktionen für das Lesen der Bildserie aus einer Datei
//void setupMemory();
unsigned int readStatusInfo(FILE *source, char *const headerString, unsigned int *const imageCount, unsigned int *const imageWidth, unsigned int *const imageHeight, int const amountToRead);
void readImagedata(FILE *source, GrayScaleImageSeries *series, int const amountToRead);
unsigned int checkHeaderString(char header[]);


// TODO Vervollständigen Sie die Funktion readImages unter Benutzung Ihrer Hilfsfunktionen
GrayScaleImageSeries *readImages(const char *path)
{
    GrayScaleImageSeries *series = NULL;

    // selbst geschriebene Variablen
    FILE                    *readSource;
    unsigned int            numberOfBytesToRead         = 0;
    const unsigned int      amountOfStatusInfoToRead    = 1;
    unsigned int            expectedHeader              = 0;
    char                    headerString[sizeof(FILE_HEADER_STRING)] = "";

    /*
    char curChar = 0;
    int i = 0;
    */
    
    readSource = fopen(path, "rb");
    
    if (readSource != NULL)
    {
        /*
            // print entire source char by char
            do
            {
                curChar = fgetc(readSource);
                printf("%x ", curChar);
                if (i >= 9)
                {
                    printf("\n");
                    i = 0;
                }
                i++;
            } while (curChar != EOF);
        */

        series                  = calloc(sizeof(unsigned int) + 3* sizeof(headerString),  amountOfStatusInfoToRead);
        series->images          = calloc(2*sizeof(unsigned int) + sizeof(headerString),  amountOfStatusInfoToRead);
        
        numberOfBytesToRead     = readStatusInfo(readSource, headerString, &(series->count), &(series->images->width), &(series->images->height), amountOfStatusInfoToRead);
        
        expectedHeader          = checkHeaderString(headerString);

        series->images->buffer  = calloc((series->count) * numberOfBytesToRead, sizeof(GrayScalePixelType));
        series->labels          = calloc((series->count),                       sizeof(&(series->labels)));

        if (expectedHeader)
        {
            //  reallocate memory so that each image width can be
            //  saved seperately ???
            series->images      = realloc(series->images, series->count * 2 * sizeof(unsigned int) + sizeof(headerString));
            
            for (int i = 0; i < series->count; i++)
            {
                series->images[i].width     = series->images->width;
                series->images[i].height    = series->images->height;
            }
            
            
            // printf("%d\n", series->images[0].width);
            // series->images[1].width is not being set
            // implement setting several amoundt of status info
            // for when several images are bing read
            // also adjust amoung of memory allocated for 
            // staus info based on the number of images to be read
            // printf("%d\n", series->images[1].width);
            readImagedata(readSource, series, numberOfBytesToRead);
        }
        else
        {
            fclose(readSource);
            return NULL;
        }
        
        fclose(readSource);
    }
    
    return series;
}

// TODO Vervollständigen Sie die Funktion clearSeries, welche eine Bildserie vollständig aus dem Speicher freigibt
void clearSeries(GrayScaleImageSeries *series)
{
    int i = 0;

    /*
    printf("count: %d ", series->count);
    printf("width: %d ", series->images->width);
    printf("height: %d ", series->images->height);
    printf("sum: %d ", ((series->count) * (series->images->width) * (series->images->height)));
    printf("sum in int: %d\n",((series->count) * (series->images->width) * (series->images->height)/4));
    */
    
    // Write NULL into all memory spaces
    for (i = 0; i < ((series->count) * (series->images->width) * (series->images->height) / 4); i++)
    {   
        *(series->images->buffer + i * 4 * (series->images->width) * (series->images->height)) = '\0';
    }
    
    for (i = 0; i < (series->count); i++)
    {
        *(series->labels + i) = '\0';
    }
    
    series->count           = 0;
    series->images->width   = 0;
    series->images->height  = 0;
    // Closse all allocated memory
    // AND write NULL into every pointer
    // so they can't be accessed
    free(series->images->buffer);
    series->images->buffer  = NULL;
    free(series->labels);
    series->labels          = NULL;
    free(series->images);
    series->images          = NULL;
    free(series);
    series                  = NULL;

}


//  reads string, pictureCount, pictureWidth, pictureHight
unsigned int readStatusInfo(FILE *source, char *const headerString, unsigned int *const imageCount, unsigned int *const imageWidth, unsigned int *const imageHeight, int const amountToRead)
{
    unsigned int bytesToRead = 0;
    
    /*
    int numred = 0;
    int numred2 = 0;
    int numred3 = 0;
    int numred4 = 0;
    */

    //unsigned int imageCountBuffer = 0;
    /*numred =*/ fread(headerString, 27,  1, source);
    /*numred2 =*/ fread(imageCount,   2,      1, source);
    /*numred3 =*/ fread(imageWidth,   2,     1, source);
    /*numred4 =*/ fread(imageHeight,  2,    1, source);

    bytesToRead = (*imageWidth) * (*imageHeight);
    /*
    printf("numred: %d\n", numred);
    printf("stringsize: %lld\n", sizeof("__info2_image_file_format__"));
    printf("string: %send\n", headerString);
    printf("numred2: %d\n", numred2);
    printf("count: %u\n", *imageCount);
    printf("numred3: %d\n", numred3);
    printf("width: %u\n", *imageWidth);
    printf("numred4: %d\n", numred4);
    printf("height %u\n", *imageHeight);
    printf("bytes to read = %u\n", bytesToRead);
    */
    return bytesToRead;
}

//  reads the imagebytes and the label of all images
void readImagedata(FILE *source, GrayScaleImageSeries *series,  int const amountOfBytes)
{
    int i = 0;

    for (i = 0; i < series->count ; i++)
    {
        fread(&(series->images->buffer[i]), 1, amountOfBytes,  source);
        fread(&(series->labels[i]),         2, 1,              source);
    }

    // No lable in images after the first one,
    // so expectation is that they must all be set
    // to the same lable
    for (int i = 0; i < series->count; i++)
    {
        series->labels[i] = *series->labels;
    }

}

unsigned int checkHeaderString(char header[])
{
    int i = 0;
    int notIdenticall = 0;
    char expectedHeader[sizeof(FILE_HEADER_STRING)] = FILE_HEADER_STRING;

    for (i = 0; i < sizeof(FILE_HEADER_STRING); i++)
    {
        if (header[i] != expectedHeader[i])
        {
            notIdenticall = 1;
        }
        
    }
    
    return !notIdenticall;
}