Function read_header

src/burp/mvol.cpp:1753–1992

____________________________________________________________ Functional description

// Functional description
//
static bool read_header(DESC handle, ULONG* buffer_size, USHORT* format, bool init_flag)
{
	TEXT buffer[MAX_FILE_NAME_SIZE], msg[BURP_MSG_GET_SIZE];

	BurpGlobals* tdgbl = BurpGlobals::getSpecific();

	// Headers are a version number, and a volume number

	if (tdgbl->stdIoMode && tdgbl->uSvc->isService())
	{
		tdgbl->uSvc->started();
		tdgbl->mvol_io_cnt = tdgbl->uSvc->getBytes(tdgbl->mvol_io_buffer, tdgbl->mvol_io_buffer_size);
	}
	else
	{
#ifndef WIN_NT
		tdgbl->mvol_io_cnt = read(handle, tdgbl->mvol_io_buffer, tdgbl->mvol_actual_buffer_size);
#else
		DWORD bytesRead = 0;
		ReadFile(handle, tdgbl->mvol_io_buffer, tdgbl->mvol_actual_buffer_size, &bytesRead, NULL);
		tdgbl->mvol_io_cnt = bytesRead;
#endif
	}
	if (!tdgbl->mvol_io_cnt)
		BURP_error_redirect(0, 45); // maybe there's a better message

	tdgbl->mvol_io_ptr = tdgbl->mvol_io_buffer;

	int attribute = get(tdgbl);
	if (attribute != rec_burp)
		BURP_error_redirect(0, 45);
		// msg 45 expected backup description record

	int l, maxlen;
	int temp;
	TEXT* p;
	for (attribute = get(tdgbl); attribute != att_end; attribute = get(tdgbl))
	{
		switch (attribute)
		{
		case att_backup_blksize:
			{
				const ULONG temp_buffer_size = get_numeric();
				if (init_flag)
					*buffer_size = temp_buffer_size;
			}
			break;

		case att_backup_compress:
			temp = get_numeric();
			if (init_flag)
				tdgbl->gbl_sw_compress = temp != 0;
			break;

		case att_backup_date:
			l = get(tdgbl);
			if (init_flag)
			{