C++ JS_GetStringBytes函数代码示例

JSBool
xpc_DumpEvalInJSStackFrame(JSContext* cx, JSUint32 frameno, const char* text)
{
    JSStackFrame* fp;
    JSStackFrame* iter = nsnull;
    JSUint32 num = 0;

    if(!cx || !text)
    {
        puts("invalid params passed to xpc_DumpEvalInJSStackFrame!");
        return JS_FALSE;
    }

    printf("js[%d]> %s\n", frameno, text);

    while(nsnull != (fp = JS_FrameIterator(cx, &iter)))
    {
        if(num == frameno)
            break;
        num++;
    }

    if(!fp)
    {
        puts("invalid frame number!");
        return JS_FALSE;
    }

    JSExceptionState* exceptionState = JS_SaveExceptionState(cx);
    JSErrorReporter older = JS_SetErrorReporter(cx, xpcDumpEvalErrorReporter);

    jsval rval;
    JSString* str;
    const char* chars;
    if(JS_EvaluateInStackFrame(cx, fp, text, strlen(text), "eval", 1, &rval) &&
       nsnull != (str = JS_ValueToString(cx, rval)) &&
       nsnull != (chars = JS_GetStringBytes(str)))
    {
        printf("%s\n", chars);
    }
    else
        puts("eval failed!");
    JS_SetErrorReporter(cx, older);
    JS_RestoreExceptionState(cx, exceptionState);
    return JS_TRUE;
}

JSBool ADM_JSAvidemuxAudio::Save(JSContext *cx, JSObject *obj, uintN argc, 
                                      jsval *argv, jsval *rval)
{// begin Save
        ADM_JSAvidemuxAudio *p = (ADM_JSAvidemuxAudio *)JS_GetPrivate(cx, obj);
        // default return value
        *rval = BOOLEAN_TO_JSVAL(false);
        if(argc != 1)
                return JS_FALSE;
        if(JSVAL_IS_STRING(argv[0]) == false)
                return JS_FALSE;
        char *pTempStr = JS_GetStringBytes(JSVAL_TO_STRING(argv[0]));
        printf("Saving Audio \"%s\"\n",pTempStr);
        enterLock();
        *rval = INT_TO_JSVAL(A_audioSave(pTempStr));
        leaveLock()
        return JS_TRUE;
}// end Save

static const char* JSVAL2String(JSContext* cx, jsval val, JSBool* isString)
{
    const char* value = nsnull;
    JSString* value_str = JS_ValueToString(cx, val);
    if(value_str)
        value = JS_GetStringBytes(value_str);
    if(value)
    {
        const char* found = strstr(value, "function ");
        if(found && (value == found || value+1 == found || value+2 == found))
            value = "[function]";
    }

    if(isString)
        *isString = JSVAL_IS_STRING(val);
    return value;
}

JSBool ADM_JSDialogFactory::JSConstructor(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval)
{
	if (argc != 1)
		return JS_FALSE;

	if (JSVAL_IS_STRING(argv[0]) == false)
		return JS_FALSE;

	ADM_scriptDialogFactoryHelper *pObject = new ADM_scriptDialogFactoryHelper(JS_GetStringBytes(JSVAL_TO_STRING(argv[0])));

	if (!JS_SetPrivate(cx, obj, pObject))
		return JS_FALSE;

	*rval = OBJECT_TO_JSVAL(obj);

	return JS_TRUE;
}

char *sm_eval(spidermonkey_vm *vm, const char *filename, const char *code, int handle_retval) {
  char *retval = NULL;
  JSScript *script;
  jsval result;

  begin_request(vm);
  script = JS_CompileScript(vm->context,
			    vm->global,
			    code, strlen(code),
			    filename, 1);
  spidermonkey_error *error = (spidermonkey_error *) JS_GetContextPrivate(vm->context);
  if (error == NULL) {
    JS_ClearPendingException(vm->context);
    JS_ExecuteScript(vm->context, vm->global, script, &result);
    error = (spidermonkey_error *) JS_GetContextPrivate(vm->context);
    if (error == NULL) {
      if (handle_retval) {
	if (JSVAL_IS_STRING(result)) {
	  JSString *str = JS_ValueToString(vm->context, result);
	  retval = copy_jsstring(str);
	}
	else if(strcmp(JS_GetStringBytes(JS_ValueToString(vm->context, result)), "undefined") == 0) {
	  retval = copy_string("{\"error\": \"Expression returned undefined\", \"lineno\": 0, \"source\": \"unknown\"}");
	}
	else {
	  retval = copy_string("{\"error\": \"non-JSON return value\", \"lineno\": 0, \"source\": \"unknown\"}");
	}
      }
      JS_DestroyScript(vm->context, script);
    }
    else {
      retval = error_to_json(error);
      free_error(error);
      JS_SetContextPrivate(vm->context, NULL);
    }
  }
  else {
    retval = error_to_json(error);
    free_error(error);
    JS_SetContextPrivate(vm->context, NULL);
  }
  JS_MaybeGC(vm->context);
  end_request(vm);
  return retval;
}

static JSBool
jsSetCooked( JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval )
{
   *rval = JSVAL_VOID ;
   if( ( 1 == argc )
       &&
       JSVAL_IS_STRING( argv[0] ) )
   {
      touchCalibration_t &cal = touchCalibration_t::get();
      cal.setCalibration( JS_GetStringBytes( JSVAL_TO_STRING( argv[0] ) ) );
      if( touchPoll_ )
         touchPoll_->setCooked();
   }
   else
      JS_ReportError( cx, "Usage: touchScreen.setCooked( { scale:{ x:#, y:# }, origin:{ x:#, y:# }, range:{ x:#, y:# }, swapXY=bool } )" );

   return JS_TRUE ;
}

static char *
getStringArgument(JSContext *cx, JSObject *obj, PRUint16 argNum, uintN argc, jsval *argv)
{
    if (argc <= argNum || !JSVAL_IS_STRING(argv[argNum])) {
        JS_ReportError(cx, "String argument expected");
        return nsnull;
    }

    /*
     * We don't want to use JS_ValueToString because we want to be able
     * to have an object to represent a target in subsequent versions.
     */
    JSString *str = JSVAL_TO_STRING(argv[argNum]);
    if (!str)
        return nsnull;

    return JS_GetStringBytes(str);
}

static JSBool
jsMD5Cram( JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval)
{
   *rval = JSVAL_FALSE ;
   if( ( 1 == argc )
       &&
       JSVAL_IS_STRING( argv[0] ) )
   {
      JSString *sArg = JSVAL_TO_STRING( argv[0] );
      md5_t md5 ;
      if( md5Cramfs( JS_GetStringBytes( sArg ), md5 ) )
         *rval = md5ToRval( cx, md5 );
   }
   else
      JS_ReportError( cx, "Usage: md5( string );" );

   return JS_TRUE;
}

/********************** Extract Path from a filename **************/
JSBool pathOnly(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval)
{// begin systemExecute
	// default return value
  *rval = INT_TO_JSVAL(-1);

  if(argc != 1)
    return JS_FALSE;
  if(JSVAL_IS_STRING(argv[0]) == false )
    return JS_FALSE;
  char *name=NULL;
  char *orgName = JS_GetStringBytes(JSVAL_TO_STRING(argv[0]));
  PathStripName(orgName);
  /* Remove last / or last \ */
  int l=strlen(orgName);
  if(l) orgName[l-1]=0;
  *rval=STRING_TO_JSVAL(JS_NewStringCopyZ(cx,orgName));
  return JS_TRUE;
}// end systemExecute

// dnsResolveEx in JS context; not available in core JavaScript.
// returns javascript null if not able to resolve.
static JSBool                                  // JS_TRUE or JS_FALSE
dns_resolve_ex(JSContext *cx, JSObject *obj, uintN argc, jsval *argv,
               jsval *rval)
{
  char* name = JS_GetStringBytes(JS_ValueToString(cx, argv[0]));
  char* out;
  char ipaddr[INET6_ADDRSTRLEN * MAX_IP_RESULTS + MAX_IP_RESULTS] = "";

  out = JS_malloc(cx, strlen(ipaddr) + 1);
  // Return "" on failure.
  if(resolve_host(name, ipaddr, MAX_IP_RESULTS, AF_UNSPEC)) {
    strcpy(out, "");
  }
  strcpy(out, ipaddr);
  JSString *str = JS_NewString(cx, out, strlen(out));
  *rval = STRING_TO_JSVAL(str);
  return JS_TRUE;
}

static JSBool
DefineGetterOrSetter(JSContext *cx, uintN argc, JSBool wantGetter, jsval *vp)
{
    uintN attrs;
    JSBool found;
    JSPropertyOp getter, setter;
    JSObject *obj2;
    jsval v;
    jsid interned_id;

    XPC_QS_ASSERT_CONTEXT_OK(cx);
    JSObject *obj = JS_THIS_OBJECT(cx, vp);
    if (!obj)
        return JS_FALSE;
    JSFastNative forward = wantGetter ? js_obj_defineGetter : js_obj_defineSetter;
    jsval id = (argc >= 1) ? JS_ARGV(cx, vp)[0] : JSVAL_VOID;
    if(!JSVAL_IS_STRING(id))
        return forward(cx, argc, vp);
    JSString *str = JSVAL_TO_STRING(id);

    const char *name = JS_GetStringBytes(str);
    if(!JS_ValueToId(cx, id, &interned_id) ||
       !JS_LookupPropertyWithFlagsById(cx, obj, interned_id,
                                       JSRESOLVE_QUALIFIED, &obj2, &v) ||
       (obj2 &&
        !JS_GetPropertyAttrsGetterAndSetterById(cx, obj2, interned_id, &attrs,
                                                &found, &getter, &setter)))
        return JS_FALSE;

    // The property didn't exist, already has a getter or setter, or is not
    // our property, then just forward now.
    if(!obj2 ||
       (attrs & (JSPROP_GETTER | JSPROP_SETTER)) ||
       !(getter || setter) ||
       !IS_PROTO_CLASS(STOBJ_GET_CLASS(obj2)))
        return forward(cx, argc, vp);

    // Reify the getter and setter...
    if(!ReifyPropertyOps(cx, obj, id, interned_id, name, getter, setter,
                         nsnull, nsnull))
        return JS_FALSE;

    return forward(cx, argc, vp);
}

JSBool
perlsub_as_constructor(
    JSContext *cx,
    JSObject *obj,
    pjsid id,
    DEFSTRICT_
    jsval *vp
) {
    // dTHX;
    const char *key;

    if(!PJSID_IS(STRING, id)) {
	return JS_TRUE;
    }

#if JS_VERSION < 185
    key = JS_GetStringBytes(PJSID_TO(STRING, id));
#else
    JSAutoByteString bytes(cx, PJSID_TO(STRING, id));
    key = bytes.ptr();
#endif

    if(strEQ(key, "constructor")) {
	JSObject *constructor;
	if(JSVAL_IS_OBJECT(*vp) && (constructor = JSVAL_TO_OBJECT(*vp)) &&  
	   PJS_GET_CLASS(cx, constructor) == &perlsub_class) {
	    /* TODO: Change the constructor 'name' */
	    jsval temp;
	    JSObject *stash = JS_GetPrototype(cx, obj);
	    JS_SetPrototype(cx, stash, JS_GetPrototype(cx, constructor));
	    JS_SetPrototype(cx, constructor, stash);
	    JS_DefineProperty(cx, constructor, "prototype", OBJECT_TO_JSVAL(obj),
		              NULL, NULL, 0);
	    JS_LookupProperty(cx, obj, "__PACKAGE__", &temp);
	    // warn("Constructor set for %s\n", JS_GetStringBytes(JSVAL_TO_STRING(temp)));
	    return JS_TRUE;
	} else {
	    JS_ReportError(cx, "Invalid constructor type");
	    return JS_FALSE;
	}
    } else
	warn ("Opps: setting %s?\n", key);
    return JS_TRUE;
}

/**
 * Get the interface name and member name (for error messages).
 *
 * We could instead have each quick stub pass its name to the error-handling
 * functions, as that name is statically known.  But that would be redundant;
 * the information is handy at runtime anyway.  Also, this code often produces
 * a more specific error message, e.g. "[nsIDOMHTMLDocument.appendChild]"
 * rather than "[nsIDOMNode.appendChild]".
 */
static void
GetMemberInfo(JSObject *obj,
              jsval memberId,
              const char **ifaceName,
              const char **memberName)
{
    // Get the interface name.  From DefinePropertyIfFound (in
    // xpcwrappednativejsops.cpp) and XPCThrower::Verbosify.
    //
    // We could instead make the quick stub could pass in its interface name,
    // but this code often produces a more specific error message, e.g.
    *ifaceName = "Unknown";

    NS_ASSERTION(IS_WRAPPER_CLASS(STOBJ_GET_CLASS(obj)) ||
                 STOBJ_GET_CLASS(obj) == &XPC_WN_Tearoff_JSClass ||
                 IS_SLIM_WRAPPER(obj),
                 "obj must be a wrapper");
    XPCWrappedNativeProto *proto;
    if(IS_SLIM_WRAPPER(obj))
    {
        proto = GetSlimWrapperProto(obj);
    }
    else
    {
        XPCWrappedNative *wrapper = (XPCWrappedNative *) obj->getPrivate();
        proto = wrapper->GetProto();
    }
    if(proto)
    {
        XPCNativeSet *set = proto->GetSet();
        if(set)
        {
            XPCNativeMember *member;
            XPCNativeInterface *iface;

            if(set->FindMember(memberId, &member, &iface))
                *ifaceName = iface->GetNameString();
        }
    }

    *memberName = (JSVAL_IS_STRING(memberId)
                   ? JS_GetStringBytes(JSVAL_TO_STRING(memberId))
                   : "unknown");
}

/** process requests in the queue.
 */
xjse_result_t	xjse_xpnet_do_queue(XPNETCTX* pxpnctx)
{
	xjse_result_t	xr1 = XJSE_SUCCESS;
	xjse_int_t		i;

	for(i = 0; i < XPNETC_NMAXREQQITEMS; i++) {
		XPNETREQQITEM*	pitem = &(pxpnctx->xpnetreqq[i]);
//XJSE_TRACE("(X) state (%d, %p)[%d]", i, pitem, pitem->state);

		switch(pitem->state) {
		case XPNREQQITEMSTATE_RESPREADY:
		{
			// response has been loaded, exec onreadystatechange.
			jsval	v1;
			JSBool	b1 = JS_GetProperty(
				pitem->pjsctx, pitem->poxhr, "onreadystatechange", &v1);
			if(b1 == JS_TRUE) {
				jsval	rv0;
				b1 = JS_CallFunctionValue(
					pitem->pjsctx, pitem->poxhr, v1, 0, 0, &rv0);
				if(b1 != JS_TRUE) {
					XJSE_TRACE("(E) JS_CallFunctionValue() failed!");
					pitem->state = XPNREQQITEMSTATE_EMPTY;
					goto	failed;
				}
XJSE_TRACE("(X) xjse_xhr_send() JS_CallFunctionValue() returned (%s).", JS_GetStringBytes(JS_ValueToString(pitem->pjsctx, rv0)));
			}
			//
			pitem->state = XPNREQQITEMSTATE_EMPTY;
		}
			break;
		case XPNREQQITEMSTATE_OBSOLETED:
			XJSE_TRACE("(X) xjse_xpnet_do_queue(): obs'ed req detected. "
				"(idx: %d)", i);
			pitem->state = XPNREQQITEMSTATE_EMPTY;
			break;
		}
	}

	return	XJSE_SUCCESS;

failed:
	return	xr1;
}

// dnsResolve in JS context; not available in core JavaScript.
// returns javascript null if not able to resolve.
static JSBool                                  // JS_TRUE or JS_FALSE
dns_resolve(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval)
{
  char* name = JS_GetStringBytes(JS_ValueToString(cx, argv[0]));
  char* out;
  char ipaddr[INET6_ADDRSTRLEN] = "";

  // Return null on failure.
  if(resolve_host(name, ipaddr, 1, AF_INET)) {
    *rval = JSVAL_NULL;
    return JS_TRUE;
  }

  out = JS_malloc(cx, strlen(ipaddr) + 1);
  strcpy(out, ipaddr);
  JSString *str = JS_NewString(cx, out, strlen(out));
  *rval = STRING_TO_JSVAL(str);
  return JS_TRUE;
}