ClamAV学习【6】—— cli_load函数浏览

（老爸回家，就放开心和他到处走，累……趁其和老妈聊天之际，再继续看代码）

参数选项，加载病毒都浏览得七七八八了，这里就贴个简单的函数注释吧。哈哈。

代码注释如下：

int cli_load(const char *filename, struct cl_engine **engine, unsigned int *signo, unsigned int options, struct cli_dbio *dbio)
{
	FILE *fs = NULL;
	int ret = CL_SUCCESS;
	uint8_t skipped = 0;
	const char *dbname;

	//打开病毒库文件
    if(!dbio && (fs = fopen(filename, "rb")) == NULL) {
	cli_errmsg("cli_load(): Can't open file %s\n", filename);
	return CL_EOPEN;
    }

	//不清楚下面宏定义为啥被忽略了
	//路径分隔符windows的应该不是/的
/*
#ifdef C_WINDOWS
    if((dbname = strrchr(filename, '\\')))
#else
*/
	//将dbname定位到文件名位置
    if((dbname = strrchr(filename, '/')))
/*#endif */
	dbname++;
    else
	dbname = filename;

	//判断拓展名
	//不同类型病毒库(临时生成)调用不同方法
    if(cli_strbcasestr(dbname, ".db")) {
	ret = cli_loaddb(fs, engine, signo, options, dbio, dbname);

    } else if(cli_strbcasestr(dbname, ".cvd")) {
	    int warn = 0;

	//判断是否为daily.cvd文件
	if(!strcmp(dbname, "daily.cvd"))
	    warn = 1;

	//调用cvdload加载病毒库
	ret = cli_cvdload(fs, engine, signo, warn, options, 0);

    } else if(cli_strbcasestr(dbname, ".cld")) {
	    int warn = 0;

	if(!strcmp(dbname, "daily.cld"))
	    warn = 1;

	ret = cli_cvdload(fs, engine, signo, warn, options | CL_DB_CVDNOTMP, 1);

    } else if(cli_strbcasestr(dbname, ".hdb")) {
	ret = cli_loadmd5(fs, engine, signo, MD5_HDB, options, dbio, dbname);

    } else if(cli_strbcasestr(dbname, ".hdu")) {
	if(options & CL_DB_PUA)
	    ret = cli_loadmd5(fs, engine, signo, MD5_HDB, options, dbio, dbname);
	else
	    skipped = 1;

    } else if(cli_strbcasestr(dbname, ".fp")) {
	ret = cli_loadmd5(fs, engine, signo, MD5_FP, options, dbio, dbname);

    } else if(cli_strbcasestr(dbname, ".mdb")) {
	ret = cli_loadmd5(fs, engine, signo, MD5_MDB, options, dbio, dbname);

    } else if(cli_strbcasestr(dbname, ".mdu")) {
	if(options & CL_DB_PUA)
	    ret = cli_loadmd5(fs, engine, signo, MD5_MDB, options, dbio, dbname);
	else
	    skipped = 1;

    } else if(cli_strbcasestr(dbname, ".ndb")) {
	ret = cli_loadndb(fs, engine, signo, 0, options, dbio, dbname);

    } else if(cli_strbcasestr(dbname, ".ndu")) {
	if(!(options & CL_DB_PUA))
	    skipped = 1;
	else
	    ret = cli_loadndb(fs, engine, signo, 0, options, dbio, dbname);

    } else if(cli_strbcasestr(dbname, ".sdb")) {
	ret = cli_loadndb(fs, engine, signo, 1, options, dbio, dbname);

    } else if(cli_strbcasestr(dbname, ".zmd")) {
	ret = cli_loadmd(fs, engine, signo, 1, options, dbio, dbname);

    } else if(cli_strbcasestr(dbname, ".rmd")) {
	ret = cli_loadmd(fs, engine, signo, 2, options, dbio, dbname);

    } else if(cli_strbcasestr(dbname, ".cfg")) {
	ret = cli_dconf_load(fs, engine, options, dbio);

    } else if(cli_strbcasestr(dbname, ".wdb")) {
	if(options & CL_DB_PHISHING_URLS) {
	    ret = cli_loadwdb(fs, engine, options, dbio);
	} else
	    skipped = 1;
    } else if(cli_strbcasestr(dbname, ".pdb")) {
	if(options & CL_DB_PHISHING_URLS) {
	    ret = cli_loadpdb(fs, engine, options, dbio);
	} else
	    skipped = 1;
    } else if(cli_strbcasestr(dbname, ".ftm")) {
	ret = cli_loadftm(fs, engine, options, 0, dbio);

    } else if(cli_strbcasestr(dbname, ".ign")) {
	ret = cli_loadign(fs, engine, options, dbio);

    } else {
	cli_dbgmsg("cli_load: unknown extension - assuming old database format\n");
	ret = cli_loaddb(fs, engine, signo, options, dbio, dbname);
    }

	//判断病毒库加载是否成功
    if(ret) {
	cli_errmsg("Can't load %s: %s\n", filename, cl_strerror(ret));
    } else  {
	if(skipped)
	    cli_dbgmsg("%s skipped\n", filename);
	else
	    cli_dbgmsg("%s loaded\n", filename);
    }

    if(fs)
	fclose(fs);

    return ret;
}

原文：http://blog.csdn.net/betabin/article/details/7435170