Function SV_WriteDownloadToClient

codemp/server/sv_client.cpp:714–934

================== SV_WriteDownloadToClient Check to see if the client wants a file, open it if needed and start pumping the client Fill up msg with data ================== */

==================
*/
void SV_WriteDownloadToClient(client_t *cl, msg_t *msg)
{
	int curindex;
	int rate;
	int blockspersnap;
	int unreferenced = 1;
	char errorMessage[1024];
	char pakbuf[MAX_QPATH], *pakptr;
	int numRefPaks;

	if (!*cl->downloadName)
		return;	// Nothing being downloaded

	if(!cl->download)
	{
		qboolean idPack = qfalse;
		qboolean missionPack = qfalse;

 		// Chop off filename extension.
		Com_sprintf(pakbuf, sizeof(pakbuf), "%s", cl->downloadName);
		pakptr = strrchr(pakbuf, '.');

		if(pakptr)
		{
			*pakptr = '\0';

			// Check for pk3 filename extension
			if(!Q_stricmp(pakptr + 1, "pk3"))
			{
				const char *referencedPaks = FS_ReferencedPakNames();

				// Check whether the file appears in the list of referenced
				// paks to prevent downloading of arbitrary files.
				Cmd_TokenizeStringIgnoreQuotes(referencedPaks);
				numRefPaks = Cmd_Argc();

				for(curindex = 0; curindex < numRefPaks; curindex++)
				{
					if(!FS_FilenameCompare(Cmd_Argv(curindex), pakbuf))
					{
						unreferenced = 0;

						// now that we know the file is referenced,
						// check whether it's legal to download it.
						missionPack = FS_idPak(pakbuf, "missionpack");
						idPack = missionPack;
						idPack = (qboolean)(idPack || FS_idPak(pakbuf, BASEGAME));

						break;
					}
				}
			}
		}

		cl->download = 0;

		// We open the file here
		if ( !sv_allowDownload->integer ||