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How to inverse the origin of a TGA file (flip it upside down)?

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Hello, I have tried to flip a TGA upside down, but I can''t get it to work. I essentially do something like this:
unsigned char t;
for (int z = 0, y = tgaImageSize-1; z < tgaImageSize; z++, y--)
	t = tgaImageData[y];
	tgaImageData[y] = tgaImageData[z];
	tgaImageData[z] = t;
It just displays the texture as it looked before I did this. Any help would be greatly appreciated!

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From my engine:
void rRawInfo::FlipVert(void) {
rByte *Buffer;
unsigned int a, b, c, d;

b = Width*BytesPP;
c = Height/2;

Buffer = (rByte *) malloc(b);

for(a=0; a<c; a++) {
d = ((Height-1)-a)*b;
memcpy(Buffer, &Data[a*b], b);
memcpy(&Data[a*b], &Data[d], b);
memcpy(&Data[d], Buffer, b);


It''s not super-optimized, but it works for me. I don''t load too many targas or bitmaps anyway, I use my own image format that has them up right by default.

[Resist Windows XP''s Invasive Production Activation Technology!]

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