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imageInput.c aktualisiert

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alle 6/6 Tests bestanden. Noch Kommentare überarbeiten. Allgemein Code nochmal cleanen. 16.11; 14:11
This commit is contained in:
Noah Gehring 2025-11-16 13:11:33 +00:00
parent 29c91593fa
commit 41ab6e7850
1 changed files with 27 additions and 137 deletions
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160
imageInput.c
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@ -5,7 +5,7 @@
#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
static int checkHeader (FILE *file)
@ -13,147 +13,37 @@ static int checkHeader (FILE *file)
char header [strlen (FILE_HEADER_STRING) +1]; //Ermittle die Länge des Strings, +1 wegen Null
size_t gelesen = fread (header, sizeof(char), strlen(FILE_HEADER_STRING), file);
if (gelesen == NULL)
if (gelesen != strlen (FILE_HEADER_STRING))
return -1;
header [strlen (FILE_HEADER_STRING)] = '\0';
if (strcmp (header, FILE_HEADER_STRING) == 0) //Headerlänge Vergleich
{
if (strcmp(header, FILE_HEADER_STRING) == 0) {
return 1;
} else
{
} else {
return -1;
}
}
static unsigned int readUnit (FILE *file)
static unsigned short readShort (FILE *file)
{
unsigned int value = 0;
size_t gelesen = fread (&value, sizeof(unsigned int), 1, file); //liest genau 4 Bytes ein
if (gelesen == NULL)
return -1;
return value;
unsigned char bytes [2];
if (fread(bytes, sizeof(unsigned char), 2, file) != 2)
return 0;
return (bytes [1] << 8) | bytes [0]; //Big-Endian -> Little-Endian
}
static GrayScaleImage readSingleImage (FILE *file)
{
GrayScaleImage img = NULL;
//Breite und Höhe einlesen
size_t gelesenWidth = fread (&img.width, sizeof(unsigned int), 1, file);
size_t gelesenHeight = fread (&img.height, sizeof(unsigned int), 1, file);
if (gelesenWidth == NULL || gelesenHeight == NULL)
return -1;
//Speicher für Pixel reservieren
size_t pixelCount = img.width * img.height;
img.buffer = malloc(pixelCount * sizeof(GrayScalePixelType));
if (img.buffer == NULL)
return -1;
//Pixel einlesen
size_t gelesenPixels = fread (img.buffer, sizeof(GrayScalePixelType), pixelCount, file);
if (gelesenPixels != pixelCount)
return -1;
return img;
}
static unsigned char readLabel (FILE *file)
{
unsigned char label = NULL;
size_t gelesen = fread (&label, sizeof(unsigned char), 1, file);
if (gelesen == NULL)
return -1;
return label;
}
// TODO Vervollständigen Sie die Funktion readImages unter Benutzung Ihrer Hilfsfunktionen
GrayScaleImageSeries *readImages(const char *path)
{
GrayScaleImageSeries *series = NULL;
unsigend int count = NULL;
FILE *file = fopen(path, "rb");
if (path == NULL) {
return -1;
}
if (checkHeader(file) != 1) {
return -1;
}
count = readUnit (file);
series = malloc (sizeof(GrayScaleImageSeries));
series ->count = count;
series ->images = malloc (count * sizeof(GrayScaleImage));
series ->labels = malloc (count * sizeof(unsigned char));
for (unsigned int i = 0; i < count; i++)
{
series ->images[i] = readSingleImage(file);
series ->labels[i] = readLabel(file);
}
fclose (file);
return series; //series ist das array das ein Bild besitzt
}
*/
// TODO Implementieren Sie geeignete Hilfsfunktionen für das Lesen der Bildserie aus einer Datei neue Version16.11. 11:40 3/6 Tests
static int checkHeader (FILE *file)
{
char header [strlen (FILE_HEADER_STRING) +1]; //Ermittle die Länge des Strings, +1 wegen Null
size_t gelesen = fread (header, sizeof(char), strlen(FILE_HEADER_STRING), file);
if (gelesen == 0)
return -1;
header [strlen (FILE_HEADER_STRING)] = '\0';
if (strcmp (header, FILE_HEADER_STRING) == 0) //Headerlänge Vergleich
{
return 1;
} else
{
return -1;
}
}
static unsigned int readUnit (FILE *file)
{
unsigned int value = 0;
size_t gelesen = fread (&value, sizeof(unsigned int), 1, file); //liest genau 4 Bytes ein
if (gelesen == 0)
return -1;
return value;
}
static GrayScaleImage readSingleImage (FILE *file)
static GrayScaleImage readSingleImage (FILE *file, unsigned short width, unsigned short height)
{
GrayScaleImage img;
img.width = width;
img.height = height;
img.buffer = NULL;
img.width = 0;
img.height = 0;
//Breite und Höhe einlesen
size_t gelesenWidth = fread (&img.width, sizeof(unsigned int), 1, file);
size_t gelesenHeight = fread (&img.height, sizeof(unsigned int), 1, file);
if (gelesenWidth == 0 || gelesenHeight == 0)
return img;
//Speicher für Pixel reservieren
size_t pixelCount = img.width * img.height;
size_t pixelCount = width * height;
img.buffer = malloc(pixelCount * sizeof(GrayScalePixelType));
if (img.buffer == NULL){
img.width = 0;
@ -167,7 +57,6 @@ static GrayScaleImage readSingleImage (FILE *file)
img.buffer = NULL;
img.width = 0;
img.height = 0;
return img;
}
return img;
@ -188,10 +77,9 @@ static unsigned char readLabel (FILE *file)
GrayScaleImageSeries *readImages(const char *path)
{
GrayScaleImageSeries *series = NULL;
unsigned int count = 0;
FILE *file = fopen(path, "rb");
if (path == 0) {
if (file == NULL) {
return NULL;
}
@ -199,28 +87,30 @@ GrayScaleImageSeries *readImages(const char *path)
return NULL;
}
count = readUnit (file);
unsigned short count = readShort(file);
unsigned short width = readShort(file);
unsigned short height = readShort(file);
series = malloc (sizeof(GrayScaleImageSeries));
if (series == NULL)
return NULL;
series->count = count;
series->images = malloc (count * sizeof(GrayScaleImage));
series->labels = malloc (count * sizeof(unsigned char));
if (series->images == NULL || series->labels == NULL)
return NULL;
for (unsigned int i = 0; i < count; i++)
{
series->images[i] = readSingleImage(file);
if (series->images[i].buffer == NULL){
}
series->images[i] = readSingleImage(file, width, height);
series->labels[i] = readLabel(file);
}
fclose (file);
return series; //series ist das array das ein Bild besitzt
return series;
}
// TODO Vervollständigen Sie die Funktion clearSeries, welche eine Bildserie vollständig aus dem Speicher freigibt
void clearSeries(GrayScaleImageSeries *series)
{