Dealing with padding in a BMP file in C

Question

I am trying to edit a BMP file in C. My code works for BMP files with no padding but I am having trouble dealing with padding.

There are a few other questions on BMP

Answer 1

Something like:

...

int originalLineSize = width * 3;
int workLineSize = originalLineSize + 4 - originalLineSize % 4;

for (int a = 0; a < bmpArraySize; ++a) {
    if ((a % workLineSize) >= originalLineSize)
        bmpArray[a] = 0x00;
    }
    else if (bmpArray[a] < 127) {
        bmpArray[a] = 0;
    ...
}