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2 changed files with 9 additions and 140 deletions
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142
imageInput.c
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@ -6,149 +6,17 @@
#define BUFFER_SIZE 100
#define FILE_HEADER_STRING "__info2_image_file_format__"
// TODO Implementieren Sie geeignete Hilfsfunktionen für das Lesen der Bildserie aus einer Datei
// DONE Implementieren Sie geeignete Hilfsfunktionen für das Lesen der Bildserie aus einer Datei
unsigned int readStatusInfo (FILE *const source, GrayScaleImageSeries *const series, char *const headerString, int const sizeToRead, int const amountToRead);
void readImagedata (FILE *const source, GrayScaleImageSeries *const series, int const amountToRead);
unsigned int checkHeaderString (const char *const header);
// DONE Vervollständigen Sie die Funktion readImages unter Benutzung Ihrer Hilfsfunktionen
// TODO Vervollständigen Sie die Funktion readImages unter Benutzung Ihrer Hilfsfunktionen
GrayScaleImageSeries *readImages(const char *path)
{
GrayScaleImageSeries *series = NULL;
FILE *readSource = 0;
const unsigned int sizeOfStausInfoElementsInBytes = 2;
const unsigned int amountOfStatusInfoToRead = 1;
unsigned int numberOfBytesToRead = 0;
unsigned int expectedHeader = 0;
char headerString[sizeof(FILE_HEADER_STRING)] = "";
readSource = fopen(path, "rb");
if (readSource != NULL)
{
series = calloc(sizeof(unsigned int) + 3* sizeof(headerString), amountOfStatusInfoToRead);
series->images = calloc(2*sizeof(unsigned int) + sizeof(headerString), amountOfStatusInfoToRead);
numberOfBytesToRead = readStatusInfo(readSource, series, headerString, sizeOfStausInfoElementsInBytes, 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;
}
readImagedata(readSource, series, numberOfBytesToRead);
}
else
{
series = NULL;
}
fclose(readSource);
}
GrayScaleImageSeries *series = NULL;
return series;
}
// DONE Vervollständigen Sie die Funktion clearSeries, welche eine Bildserie vollständig aus dem Speicher freigibt
void clearSeries(GrayScaleImageSeries * series)
// TODO Vervollständigen Sie die Funktion clearSeries, welche eine Bildserie vollständig aus dem Speicher freigibt
void clearSeries(GrayScaleImageSeries *series)
{
int i = 0;
// 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 headerString, pictureCount, pictureWidth, pictureHight
unsigned int readStatusInfo(FILE *const source, GrayScaleImageSeries *const series, char *const headerString, int const sizeToRead, int const amountToRead)
{
unsigned int bytesToRead = 0;
fread(headerString, sizeof(FILE_HEADER_STRING) - 1, amountToRead, source);
fread(&(series->count), sizeToRead, amountToRead, source);
fread(&(series->images->width), sizeToRead, amountToRead, source);
fread(&(series->images->height), sizeToRead, amountToRead, source);
bytesToRead = (series->images->width) * (series->images->height);
return bytesToRead;
}
// reads the imagebytes and the label of all images
void readImagedata(FILE *const source, GrayScaleImageSeries *const series, int const amountOfBytes)
{
int i = 0;
for (i = 0; i < series->count ; i++)
{
fread(&(series->images->buffer[i]), sizeof(*series->images->buffer), amountOfBytes, source);
fread(&(series->labels[i]), sizeof(*series->images->buffer), sizeof(*series->labels), source);
}
}
// checks if the read headerString matches the expected headerString
unsigned int checkHeaderString(const char *const 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;
}

7
imageInputTests.c
View File

@ -9,18 +9,19 @@
static void prepareImageFile(const char *path, unsigned short int width, unsigned short int height, unsigned int short numberOfImages, unsigned char label)
{
FILE *file = fopen(path, "wb");
if(file != NULL)
{
const char *fileTag = "__info2_image_file_format__";
GrayScalePixelType *zeroBuffer = (GrayScalePixelType *)calloc(numberOfImages * width * height, sizeof(GrayScalePixelType));
if(zeroBuffer != NULL)
{
fwrite(fileTag, sizeof(fileTag[0]), strlen(fileTag), file);
fwrite(&numberOfImages, sizeof(numberOfImages), 1, file);
fwrite(&width, sizeof(width), 1, file);
fwrite(&height, sizeof(height), 1, file);
for(int i = 0; i < numberOfImages; i++)
{
fwrite(zeroBuffer, sizeof(GrayScalePixelType), width * height, file);
@ -29,7 +30,7 @@ static void prepareImageFile(const char *path, unsigned short int width, unsigne
free(zeroBuffer);
}
fclose(file);
}
}