Function findNthAtom

xs/platforms/mc/xsHosts.c:470–503

}

char *findNthAtom(uint32_t atomTypeIn, int index, const uint8_t *xsb, int xsbSize, int *atomSizeOut)
{
	const uint8_t *atom = xsb, *xsbEnd = xsb + xsbSize;

	if (0 == index) {	// hack - only validate XS_A header at root...
		if (c_read32be(xsb + 4) != FOURCC('X', 'S', '_', 'A'))
			return NULL;

		atom += 8;
	}

	while (atom < xsbEnd) {
		int32_t atomSize = c_read32be(atom);
		uint32_t atomType = c_read32be(atom + 4);

		if ((atomSize < 8) || ((atom + atomSize) > xsbEnd))
			return NULL;

		if (atomType == atomTypeIn) {
			index -= 1;
			if (index <= 0) {
				if (atomSizeOut)
					*atomSizeOut = atomSize - 8;
				return (char *)(atom + 8);
			}
		}
		atom += atomSize;
	}

	if (atomSizeOut)
		*atomSizeOut = 0;

	return NULL;
}

#endif