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created support-Function 'readStatusInfo'

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This commit is contained in:
Jonas Hofmann 2025-11-13 01:43:59 +01:00
parent 3ca24ebdb7
commit 12359f3ac5
1 changed files with 27 additions and 18 deletions
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35
imageInput.c
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@ -11,6 +11,10 @@
// TODO Implementieren Sie geeignete Hilfsfunktionen für das Lesen der Bildserie aus einer Datei
int readStatusInfo(FILE **source, char *const headerString, int *const imageCount, int *const imageWidth, int *const imageHeight, int const amountToRead);
// TODO Vervollständigen Sie die Funktion readImages unter Benutzung Ihrer Hilfsfunktionen
GrayScaleImageSeries *readImages(const char *path)
{
@ -20,27 +24,17 @@ GrayScaleImageSeries *readImages(const char *path)
FILE *readSource;
int i = 0;
unsigned int numberOfBytesToRead = 0;
unsigned int amountOfStatusInfoToRead = 1;
const unsigned int amountOfStatusInfoToRead = 1;
char headerString[sizeof("__info2_image_file_format__")];
readSource = fopen(path, "rb");
if (readSource != NULL)
{
// dateiaufbau:
numberOfBytesToRead = readStatusInfo(&readSource, headerString, &series->count, &series->images->width, &series->images->height, amountOfStatusInfoToRead);
// string __info2_image_file_format__
fread(headerString, sizeof(headerString), amountOfStatusInfoToRead, readSource);
// INT - Anzahl der Bilder
fread(&(series->count), sizeof(series->count), amountOfStatusInfoToRead, readSource);
// INT - Breite eines Bildes (Pixel)
fread(&(series->images->width), sizeof(series->images->width), amountOfStatusInfoToRead, readSource);
// INT - Höhe eines Bildes (Pixel)
fread(&(series->images->height), sizeof(series->images->height), amountOfStatusInfoToRead, readSource);
// Bis hier alles nur einmal durchführen
numberOfBytesToRead = (series->images->width) * (series->images->height);
// bufferspeicher anlegen der unsigned char pointer
// mit anzahl der pixel als größe ist um dann
// grauwerte in diesen buffer zu schreiben
@ -94,3 +88,18 @@ void clearSeries(GrayScaleImageSeries *series)
series = NULL;
}
// reads string, pictureCount, pictureWidth, pictureHight
int readStatusInfo(FILE **source, char *const headerString, int *const imageCount, int *const imageWidth, int *const imageHeight, int const amountToRead)
{
int bytesToRead = 0;
fread(headerString, sizeof(*headerString), amountToRead, *source);
fread(imageCount, sizeof(*imageCount), amountToRead, *source);
fread(imageWidth, sizeof(*imageWidth), amountToRead, *source);
fread(imageHeight, sizeof(*imageHeight), amountToRead, *source);
bytesToRead = (*imageWidth) * (*imageHeight);
return bytesToRead;
}