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CodeLib → Programming aids → C / C++

CodeLib C / C++: Search and replace a 4-byte sequence in a binary file

int binary_replace_file(const char* filename, unsigned int search, unsigned int replace) {
        unsigned int srecord = 0;
        int found = 0;

        FILE* fptr = fopen(filename, "rb+");
        if (fptr == NULL) return -1;

        while ((fread(&srecord, sizeof(srecord), 1, fptr) == 1))
        {
                if (srecord == search) {
                        srecord = replace;
                        fseek(fptr, -1*(long)sizeof(srecord), SEEK_CUR);
                        fwrite(&srecord, (int)sizeof(srecord), 1, fptr);
                        fseek(fptr, 0, SEEK_CUR); // important!
                        found++;
                }
                else {
                        fseek(fptr, -1*(long)(sizeof(srecord) - 1), SEEK_CUR);
                }
        }
        fclose(fptr);

        return found;
}
Daniel Marschall
ViaThinkSoft Co-Founder
Autor: Daniel Marschall
Datum: 8 August 2021
Gelesen: 642 Mal