void hexdump(const void * buf, size_t size)
{
	const uchar * cbuf = (const uchar *) buf;
	const ulong BYTES_PER_LINE = 16;
	ulong offset, minioffset;

	for (offset = 0; offset < size; offset += BYTES_PER_LINE) {
		// OFFSETXX  xx xx xx xx xx xx xx xx  xx xx xx xx xx xx xx xx   abcdefghijklmnop
		printf("%08x  ", cbuf + offset);
		for (minioffset = offset; minioffset < offset + BYTES_PER_LINE; minioffset++) {
			if (minioffset - offset == (BYTES_PER_LINE / 2)) {
				printf(" ");
			}

			if (minioffset < size) {
				printf("%02x ", cbuf[minioffset]);
			} else {
				printf("   ");
			}
		}
		printf("  ");

		for (minioffset = offset; minioffset < offset + BYTES_PER_LINE; minioffset++) {
			if (minioffset >= size)
				break;

			if (cbuf[minioffset] < 0x20 || cbuf[minioffset] > 0x7e) {
				printf(".");
			} else {
				printf("%c", cbuf[minioffset]);
			}
		}
		printf("\n");
	}
}