Function romfsMountSelf

libctru/source/romfs_dev.c:234–294

}

Result romfsMountSelf(const char* name)
{
	// If we are not 3DSX, we need to mount this process' real RomFS
	if (!envIsHomebrew())
		return romfsMountFromCurrentProcess(name);

	// Otherwise, we use the embedded RomFS inside the 3DSX file
    // Retrieve the filename of our 3DSX file
	const char* filename = __romfs_path;
	if (__system_argc > 0 && __system_argv[0])
		filename = __system_argv[0];
	if (!filename)
		return MAKERESULT(RL_USAGE, RS_INVALIDARG, RM_ROMFS, RD_NO_DATA);

	// Adjust the path name
	if (strncmp(filename, "sdmc:/", 6) == 0)
		filename += 5;
	else if (strncmp(filename, "3dslink:/", 9) == 0)
	{
		strncpy(__ctru_dev_path_buf, "/3ds",     PATH_MAX);
		strncat(__ctru_dev_path_buf, filename+8, PATH_MAX);
		__ctru_dev_path_buf[PATH_MAX] = 0;
		filename = __ctru_dev_path_buf;
	}
	else
		return MAKERESULT(RL_USAGE, RS_NOTSUPPORTED, RM_ROMFS, RD_NOT_IMPLEMENTED);

	// Convert the path to UTF-16
	ssize_t units = utf8_to_utf16(__ctru_dev_utf16_buf, (const uint8_t*)filename, PATH_MAX);
	if (units < 0 || units > PATH_MAX)
		return MAKERESULT(RL_USAGE, RS_INVALIDARG, RM_ROMFS, RD_OUT_OF_RANGE);
	__ctru_dev_utf16_buf[units] = 0;

	// Open the file directly
	Handle fd = 0;
	FS_Path archPath = { PATH_EMPTY, 1, "" };
	FS_Path filePath = { PATH_UTF16, (units+1)*2, __ctru_dev_utf16_buf };
	Result rc = FSUSER_OpenFileDirectly(&fd, ARCHIVE_SDMC, archPath, filePath, FS_OPEN_READ, 0);
	if (R_FAILED(rc))
		return rc;

	// Read and parse the header
	_3DSX_Header hdr;
	u32 bytesRead = 0;
	rc = FSFILE_Read(fd, &bytesRead, 0, &hdr, sizeof(hdr));
	if (R_FAILED(rc))
	{
		FSFILE_Close(fd);
		return rc;
	}

	// Validate the 3DSX header
	if (bytesRead != sizeof(hdr) || hdr.magic != _3DSX_MAGIC || hdr.headerSize < sizeof(hdr))
	{
		FSFILE_Close(fd);
		return MAKERESULT(RL_FATAL, RS_NOTFOUND, RM_ROMFS, RD_NOT_FOUND);
	}