72 lines
1.5 KiB
C
72 lines
1.5 KiB
C
##include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "imageInput.h"
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#define BUFFER_SIZE 100
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#define FILE_HEADER_STRING "__info2_image_file_format__"
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/*
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* Hilfsfunktionen
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*/
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static FILE *openImageFile(const char *path) // Checks if the given filename pointer is valid (not NULL).
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{
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if (path == NULL)
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{
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return NULL;
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}
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return fopen(path, "rb"); //opening document in binear
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}
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static int readAndCheckHeader(FILE *file) // gets the length of the header text
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{
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size_t headerLength = strlen(FILE_HEADER_STRING);
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char buffer[BUFFER_SIZE];
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if (headerLength + 1 > BUFFER_SIZE) //checks if buffer is big enough for header size
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{
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return 0;
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}
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if (fread(buffer, 1, headerLength, file) != headerLength) // Checks if reading the expected number of header bytes from the file succeeded
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return 0;
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buffer[headerLength] = '\0'; // add string terminator so the header becomes a valid C-string
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if (strcmp(buffer, FILE_HEADER_STRING) != 0) // checks if the expected header matches the header read from the file
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{
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return 0;
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}
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return 1; /* Header ok */
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}
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static int readImageMetaData(FILE *file, // reads the metadata (count, width, height) from the file and stores them in the provided pointers
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unsigned short *count,
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unsigned short *width,
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unsigned short *height)
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{
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/*
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Hauptfunktion
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*/
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