cfad47cfa3/tads3/resload.cpp

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#ifdef RCSID



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static char RCSid[] =



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"$Header: d:/cvsroot/tads/tads3/resload.cpp,v 1.2 1999/05/17 02:52:29 MJRoberts Exp $";



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#endif



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/* 



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 *   Copyright (c) 1998, 2002 Michael J. Roberts.  All Rights Reserved.



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 *   



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 *   Please see the accompanying license file, LICENSE.TXT, for information



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 *   on using and copying this software.  



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 */



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/*



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Name



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  resload.cpp - resource loader



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Function



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Notes



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Modified



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  10/17/98 MJRoberts  - Creation



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*/



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#include <stddef.h>



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#include <string.h>



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#include "t3std.h"



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#include "resload.h"



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/* ------------------------------------------------------------------------ */



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/*



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 *   create resource loader 



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 */



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CResLoader::CResLoader()



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{



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    /* we have no root directory */



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    root_dir_ = 0;



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    /* no executable path yet */



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    exe_filename_ = 0;



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}



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/*



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 *   create a resource loader given a root directory 



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 */



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CResLoader::CResLoader(const char *root_dir)



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{



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    /* remember the root directory for file searches */



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    root_dir_ = lib_copy_str(root_dir);



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    /* no executable path yet */



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    exe_filename_ = 0;



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}



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/*



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 *   delete resource loader 



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 */



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CResLoader::~CResLoader()



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{



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    /* free our root directory string and executable path string */



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    lib_free_str(root_dir_);



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    lib_free_str(exe_filename_);



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}



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/*



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 *   Open a resource file given the resource path.



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 */



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osfildef *CResLoader::open_res_file(const char *respath,



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                                    const char *deflib,



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                                    const char *exerestype)



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{



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    char filepath[OSFNMAX];



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    osfildef *fp;



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    /* 



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     *   Look for the resource as an external file.  If we have a root



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     *   directory, look for the file under that directory; otherwise,



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     *   look for it in the current directory.  



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     */



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    if (root_dir_ != 0)



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    {



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        char fname[OSFNMAX];



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        /* get the resource name as a file path */



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        os_cvt_url_dir(fname, sizeof(fname), respath, FALSE);



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        /* build a full path from the root directory and the resource path */



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        os_build_full_path(filepath, sizeof(filepath), root_dir_, fname);



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    }



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    else



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    {



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        /* get the resource name as a file path */



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        os_cvt_url_dir(filepath, sizeof(filepath), respath, FALSE);



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    }



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    /* try opening the file */



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    fp = osfoprb(filepath, OSFTBIN);



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    /* if we didn't find it, try looking in the default library */



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    if (fp == 0 && deflib != 0)



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    {



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        char fname[OSFNMAX];



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        /* convert from URL notation to local path conventions */



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        os_cvt_url_dir(fname, sizeof(fname), deflib, FALSE);



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        /* build the full path, starting in the root resource directory */



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        os_build_full_path(filepath, sizeof(filepath), root_dir_, fname);



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        /* add the default resource library extension */



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        os_defext(filepath, "t3r");



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        /* try opening the file */



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        fp = open_lib_res(filepath, respath);



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    }



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    /* if we still didn't find it, try looking in the executable */



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    if (fp == 0 && exerestype != 0)



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        fp = open_exe_res(respath, exerestype);



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    /* return the result */



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    return fp;



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}