everyone, this is a segment of the code from pset4(whodunit) copy.c, and I'm wondering why the function fseek is needed. Given that padding cannot be read by fread, why not just simply use fputc to add the padding right after the pixels into the output file, and do the next round of the for loop to read the next line from the input file? Why do we bother skipping over?
Thanks!
// iterate over infile's scanlines for (int i = 0, biHeight = abs(bi.biHeight); i < biHeight; i++) { // iterate over pixels in scanline for (int j = 0; j < bi.biWidth; j++) { // temporary storage RGBTRIPLE triple; // read RGB triple from infile fread(&triple, sizeof(RGBTRIPLE), 1, inptr); // write RGB triple to outfile fwrite(&triple, sizeof(RGBTRIPLE), 1, outptr); } // skip over padding, if any fseek(inptr, padding, SEEK_CUR); // then add it back (to demonstrate how) for (int k = 0; k < padding; k++) { fputc(0x00, outptr); } } 
