CyberCat

I don't know why people prefer integers type for this purpose which forces you to deal with endianness.

I just simplified yours too.

void inject(uint64_t offset, const void *bytes, size_t bytes_len) {
	 MSHookMemory((void *)getRealOffset(offset), bytes, bytes_len);
}

Usage:

//offset & bytes literal & bytes length
/* 
mov w0, #1
ret 
*/
inject(0x100299DC4, "\x20\x00\x80\x52\xC0\x03\x5F\xD6", 8);

You can write as many bytes as you want with this.