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added function to check for correct header

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This commit is contained in:
Jonas Hofmann 2025-11-20 08:27:00 +01:00
parent 84139cae5f
commit 8ab69dd403
1 changed files with 54 additions and 20 deletions
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74
imageInput.c
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@ -13,6 +13,7 @@
//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, unsigned char *const imageBuffer, unsigned char *const labelBuffer,int const imageCount ,int const amountToRead);
unsigned int checkHeaderString(char header[]);
// TODO Vervollständigen Sie die Funktion readImages unter Benutzung Ihrer Hilfsfunktionen
@ -24,17 +25,19 @@ GrayScaleImageSeries *readImages(const char *path)
FILE *readSource;
unsigned int numberOfBytesToRead = 0;
const unsigned int amountOfStatusInfoToRead = 1;
char headerString[sizeof("__info2_image_file_format__\0")] = "";
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
{
@ -48,22 +51,33 @@ GrayScaleImageSeries *readImages(const char *path)
i++;
} while (curChar != EOF);
// print entire source char by char
*/
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);
numberOfBytesToRead = readStatusInfo(readSource, headerString, &(series->count), &(series->images->width), &(series->images->height), amountOfStatusInfoToRead);
expectedHeader = checkHeaderString(headerString);
if (expectedHeader)
{
series->images->buffer = calloc((series->count) * numberOfBytesToRead, sizeof(GrayScalePixelType));
series->labels = calloc((series->count), sizeof(&(series->labels)));
//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->images->buffer, series->labels, series->count, numberOfBytesToRead);
}
else
{
printf("unexpected header!\n");
}
series->images->buffer = calloc((series->count) * numberOfBytesToRead, sizeof(GrayScalePixelType));
series->labels = calloc((series->count), sizeof(&(series->labels)));
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->images->buffer, series->labels, series->count, numberOfBytesToRead);
fclose(readSource);
}
@ -110,17 +124,18 @@ unsigned int readStatusInfo(FILE *source, char *const headerString, unsigned int
{
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);
/*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);
/*
@ -150,3 +165,22 @@ void readImagedata(FILE *source, unsigned char *const imageBuffer, unsigned char
}
}
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;
printf("%c != %C", header[i], expectedHeader[i]);
}
}
return !notIdenticall;
}