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imageInput: Kommntare verbessert

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Pia Keil 2025-11-25 21:08:44 +01:00
parent eca1c1e4cb
commit 8605e292fd
1 changed files with 41 additions and 27 deletions
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68
imageInput.c
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@ -7,43 +7,46 @@
#define FILE_HEADER_STRING "__info2_image_file_format__"
/*
* Diese Hilfsfunktionen kümmern sich um:
* - Das Öffnen der Datei und Überprüfen des Dateinamens
* - Das Überprüfen des Headers, um sicherzustellen, dass es sich um die richtige Datei handelt
* - Das Einlesen der Metadaten (Anzahl der Bilder, Bildbreite und -höhe)
* -> Die Hilfsfunktionen garantieren, dass die Datei gültig ist, bevor mit dem Einlesen der Bilddaten fortgefahren wird.
//HilfsFunktionen:
/* Opens the file in binary mode.
* path: file path to open (must not be NULL).
* returns FILE* or NULL on failure.
*/
static FILE *openImageFile(const char *path) // Checks if the given filename pointer is valid (not NULL).
static FILE *openImageFile(const char *path)
{
if (path == NULL)
{
return NULL;
}
return fopen(path, "rb"); //opening document in binear
return fopen(path, "rb");
}
static int readAndCheckHeader(FILE *file) // gets the length of the header text
/* Reads and checks the file header.
* file: opened file to read the header from.
* returns 1 if header is valid, otherwise 0.
*/
static int readAndCheckHeader(FILE *file)
{
size_t headerLength = strlen(FILE_HEADER_STRING);
char buffer[BUFFER_SIZE];
if (headerLength + 1 > BUFFER_SIZE) //checks if buffer is big enough for header size
if (headerLength + 1 > BUFFER_SIZE)
{
return 0;
}
if (fread(buffer, 1, headerLength, file) != headerLength) // Checks if reading the expected number of header bytes from the file succeeded
if (fread(buffer, 1, headerLength, file) != headerLength)
{
return 0;
}
buffer[headerLength] = '\0'; // add string terminator so the header becomes a valid C-string
buffer[headerLength] = '\0';
if (strcmp(buffer, FILE_HEADER_STRING) != 0) // checks if the expected header matches the header read from the file
if (strcmp(buffer, FILE_HEADER_STRING) != 0)
{
return 0;
}
@ -52,25 +55,29 @@ static int readAndCheckHeader(FILE *file) // gets the length of the header text
}
static int readImageMetaData(FILE *file, // reads the metadata (count, width, height) from the file and stores them in the provided pointers
/* Reads metadata: image count, width, and height.
* file: file to read from; count/width/height are outputs.
* returns 1 on success or 0 on invalid/zero metadata.
*/
static int readImageMetaData(FILE *file,
unsigned short *count,
unsigned short *width,
unsigned short *height)
{
if (fread(count, sizeof(unsigned short), 1, file) != 1) // read the number of images from the file
if (fread(count, sizeof(unsigned short), 1, file) != 1)
{
return 0;
}
if (fread(width, sizeof(unsigned short), 1, file) != 1) // reads the image width
if (fread(width, sizeof(unsigned short), 1, file) != 1)
{
return 0;
}
if (fread(height, sizeof(unsigned short), 1, file) != 1) //reads the image height
if (fread(height, sizeof(unsigned short), 1, file) != 1)
{
return 0;
}
if (*count == 0 || *width == 0 || *height == 0) // check for invalid metadata (count, width or height cannot be zero)
if (*count == 0 || *width == 0 || *height == 0)
{
return 0;
}
@ -79,9 +86,13 @@ static int readImageMetaData(FILE *file, // reads the metadata (count, width, he
}
/*
Hauptfunktion
*/
//Hauptfunktion:
/* Loads all images + labels from a .info2 file.
* path: file path to load.
* returns a new GrayScaleImageSeries or NULL on error.
*/
GrayScaleImageSeries *readImages(const char *path)
{
// 1. Open the file
@ -110,7 +121,7 @@ GrayScaleImageSeries *readImages(const char *path)
}
// 4. Allocate memory for image series
GrayScaleImageSeries *series = (GrayScaleImageSeries *)malloc(sizeof(GrayScaleImageSeries)); // Allocate memory for the image series, images, and labels. Return NULL if allocation fails.
GrayScaleImageSeries *series = (GrayScaleImageSeries *)malloc(sizeof(GrayScaleImageSeries));
if (series == NULL)
{
fclose(file);
@ -154,7 +165,7 @@ GrayScaleImageSeries *readImages(const char *path)
return NULL;
}
if (fread(image->buffer, sizeof(GrayScalePixelType), numPixels, file) != numPixels) // Check if the correct number of pixel values (width * height) were read for the image
if (fread(image->buffer, sizeof(GrayScalePixelType), numPixels, file) != numPixels)
{
for (unsigned int j = 0; j <= i; j++)
{
@ -167,7 +178,7 @@ GrayScaleImageSeries *readImages(const char *path)
return NULL;
}
if (fread(&series->labels[i], sizeof(unsigned char), 1, file) != 1) // Check if the label for the image was successfully read (1 byte)
if (fread(&series->labels[i], sizeof(unsigned char), 1, file) != 1)
{
for (unsigned int j = 0; j <= i; j++)
{
@ -185,7 +196,10 @@ GrayScaleImageSeries *readImages(const char *path)
return series;
}
// TODO Vervollständigen Sie die Funktion clearSeries, welche eine Bildserie vollständig aus dem Speicher freigibt
/* Frees the entire image series.
* series: image series to free (NULL-safe).
* returns nothing (void).
*/
void clearSeries(GrayScaleImageSeries *series)
{
if (series == NULL)