Thread: [Tutorial] Unlocking Dvars [Q3]

nice work.

but if you decompiele the function you can get many more staff and more to understanding how the q3/Reverse Engineering works
and a game like call of duty 1 its jut perfect for it

in the q3 sdk:

Code:

cvar_t *Cvar_Set2( const char *var_name, const char *value, qboolean force ) {
    cvar_t    *var;

    Com_DPrintf( "Cvar_Set2: %s %s\n", var_name, value );

    if ( !Cvar_ValidateString( var_name ) ) {
        Com_Printf("invalid cvar name string: %s\n", var_name );
        var_name = "BADNAME";
    }

#if 0    // FIXME
    if ( value && !Cvar_ValidateString( value ) ) {
        Com_Printf("invalid cvar value string: %s\n", value );
        var_value = "BADVALUE";
    }
#endif

    var = Cvar_FindVar (var_name);
    if (!var) {
        if ( !value ) {
            return NULL;
        }
        // create it
        if ( !force ) {
            return Cvar_Get( var_name, value, CVAR_USER_CREATED );
        } else {
            return Cvar_Get (var_name, value, 0);
        }
    }

    if (!value ) {
        value = var->resetString;
    }

    if (!strcmp(value,var->string)) {
        return var;
    }
    // note what types of cvars have been modified (userinfo, archive, serverinfo, systeminfo)
    cvar_modifiedFlags |= var->flags;

    if (!force)
    {
        if (var->flags & CVAR_ROM)
        {
            Com_Printf ("%s is read only.\n", var_name);
            return var;
        }

        if (var->flags & CVAR_INIT)
        {
            Com_Printf ("%s is write protected.\n", var_name);
            return var;
        }

        if (var->flags & CVAR_LATCH)
        {
            if (var->latchedString)
            {
                if (strcmp(value, var->latchedString) == 0)
                    return var;
                Z_Free (var->latchedString);
            }
            else
            {
                if (strcmp(value, var->string) == 0)
                    return var;
            }

            Com_Printf ("%s will be changed upon restarting.\n", var_name);
            var->latchedString = CopyString(value);
            var->modified = qtrue;
            var->modificationCount++;
            return var;
        }

        if ( (var->flags & CVAR_CHEAT) && !cvar_cheats->integer )
        {
            Com_Printf ("%s is cheat protected.\n", var_name);
            return var;
        }

    }
    else
    {
        if (var->latchedString)
        {
            Z_Free (var->latchedString);
            var->latchedString = NULL;
        }
    }

    if (!strcmp(value, var->string))
        return var;        // not changed

    var->modified = qtrue;
    var->modificationCount++;
    
    Z_Free (var->string);    // free the old value string
    
    var->string = CopyString(value);
    var->value = atof (var->string);
    var->integer = atoi (var->string);

    return var;
}

the decompieled version from cod1, i addet a few comments

IDA - D:\games\call of duty\CoDMP.exe - [Pseudocode]

Originally Posted by Couch

Wow King you really make good use of hexrays plugin for IDA

And yeah, really quick tutorial for C&P (sorry..); some people should understand the address for the instructions and not the reference being used with the instructions.

hexrays <3
best plugin ever made for ida

Originally Posted by Couch

And yeah, really quick tutorial for C&P (sorry..);

Originally Posted by Lycosa

Believe it or not, but I didn't C+P this from anything thank you very much.