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      1 /*
      2  * Copyright (C) 2008, 2009 Google Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions are
      6  * met:
      7  *
      8  *     * Redistributions of source code must retain the above copyright
      9  * notice, this list of conditions and the following disclaimer.
     10  *     * Redistributions in binary form must reproduce the above
     11  * copyright notice, this list of conditions and the following disclaimer
     12  * in the documentation and/or other materials provided with the
     13  * distribution.
     14  *     * Neither the name of Google Inc. nor the names of its
     15  * contributors may be used to endorse or promote products derived from
     16  * this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #include "config.h"
     32 #include "V8NPUtils.h"
     33 
     34 #include "DOMWindow.h"
     35 #include "Frame.h"
     36 #include "PlatformString.h"
     37 #include "npruntime_impl.h"
     38 #include "npruntime_priv.h"
     39 #include "NPV8Object.h"
     40 #include "V8NPObject.h"
     41 #include "V8Proxy.h"
     42 
     43 namespace WebCore {
     44 
     45 void convertV8ObjectToNPVariant(v8::Local<v8::Value> object, NPObject* owner, NPVariant* result)
     46 {
     47     VOID_TO_NPVARIANT(*result);
     48 
     49     // It is really the caller's responsibility to deal with the empty handle case because there could be different actions to
     50     // take in different contexts.
     51     ASSERT(!object.IsEmpty());
     52 
     53     if (object.IsEmpty())
     54         return;
     55 
     56     if (object->IsNumber())
     57         DOUBLE_TO_NPVARIANT(object->NumberValue(), *result);
     58     else if (object->IsBoolean())
     59         BOOLEAN_TO_NPVARIANT(object->BooleanValue(), *result);
     60     else if (object->IsNull())
     61         NULL_TO_NPVARIANT(*result);
     62     else if (object->IsUndefined())
     63         VOID_TO_NPVARIANT(*result);
     64     else if (object->IsString()) {
     65         v8::String::Utf8Value utf8(object);
     66         int length = utf8.length() + 1;
     67         char* utf8Chars = reinterpret_cast<char*>(malloc(length));
     68         memcpy(utf8Chars, *utf8, length);
     69         STRINGN_TO_NPVARIANT(utf8Chars, utf8.length(), *result);
     70     } else if (object->IsObject()) {
     71         DOMWindow* window = V8Proxy::retrieveWindow(V8Proxy::currentContext());
     72         NPObject* npobject = npCreateV8ScriptObject(0, v8::Handle<v8::Object>::Cast(object), window);
     73         if (npobject)
     74             _NPN_RegisterObject(npobject, owner);
     75         OBJECT_TO_NPVARIANT(npobject, *result);
     76     }
     77 }
     78 
     79 v8::Handle<v8::Value> convertNPVariantToV8Object(const NPVariant* variant, NPObject* npobject)
     80 {
     81     NPVariantType type = variant->type;
     82 
     83     switch (type) {
     84     case NPVariantType_Int32:
     85         return v8::Integer::New(NPVARIANT_TO_INT32(*variant));
     86     case NPVariantType_Double:
     87         return v8::Number::New(NPVARIANT_TO_DOUBLE(*variant));
     88     case NPVariantType_Bool:
     89         return NPVARIANT_TO_BOOLEAN(*variant) ? v8::True() : v8::False();
     90     case NPVariantType_Null:
     91         return v8::Null();
     92     case NPVariantType_Void:
     93         return v8::Undefined();
     94     case NPVariantType_String: {
     95         NPString src = NPVARIANT_TO_STRING(*variant);
     96         return v8::String::New(src.UTF8Characters, src.UTF8Length);
     97     }
     98     case NPVariantType_Object: {
     99         NPObject* obj = NPVARIANT_TO_OBJECT(*variant);
    100         if (obj->_class == npScriptObjectClass)
    101             return reinterpret_cast<V8NPObject*>(obj)->v8Object;
    102         return createV8ObjectForNPObject(obj, npobject);
    103     }
    104     default:
    105         return v8::Undefined();
    106     }
    107 }
    108 
    109 // Helper function to create an NPN String Identifier from a v8 string.
    110 NPIdentifier getStringIdentifier(v8::Handle<v8::String> str)
    111 {
    112     const int kStackBufferSize = 100;
    113 
    114     int bufferLength = str->Utf8Length() + 1;
    115     if (bufferLength <= kStackBufferSize) {
    116         // Use local stack buffer to avoid heap allocations for small strings. Here we should only use the stack space for
    117         // stackBuffer when it's used, not when we use the heap.
    118         //
    119         // WriteUtf8 is guaranteed to generate a null-terminated string because bufferLength is constructed to be one greater
    120         // than the string length.
    121         char stackBuffer[kStackBufferSize];
    122         str->WriteUtf8(stackBuffer, bufferLength);
    123         return _NPN_GetStringIdentifier(stackBuffer);
    124     }
    125 
    126     v8::String::Utf8Value utf8(str);
    127     return _NPN_GetStringIdentifier(*utf8);
    128 }
    129 
    130 struct ExceptionHandlerInfo {
    131     ExceptionHandlerInfo* previous;
    132     ExceptionHandler handler;
    133     void* data;
    134 };
    135 
    136 static ExceptionHandlerInfo* topHandler;
    137 
    138 void pushExceptionHandler(ExceptionHandler handler, void* data)
    139 {
    140     ExceptionHandlerInfo* info = new ExceptionHandlerInfo;
    141     info->previous = topHandler;
    142     info->handler = handler;
    143     info->data = data;
    144     topHandler = info;
    145 }
    146 
    147 void popExceptionHandler()
    148 {
    149     ASSERT(topHandler);
    150     ExceptionHandlerInfo* doomed = topHandler;
    151     topHandler = topHandler->previous;
    152     delete doomed;
    153 }
    154 
    155 ExceptionCatcher::ExceptionCatcher()
    156 {
    157     if (!topHandler)
    158         m_tryCatch.SetVerbose(true);
    159 }
    160 
    161 ExceptionCatcher::~ExceptionCatcher()
    162 {
    163     if (!m_tryCatch.HasCaught())
    164         return;
    165 
    166     if (topHandler)
    167         topHandler->handler(topHandler->data, *v8::String::Utf8Value(m_tryCatch.Exception()));
    168 }
    169 
    170 } // namespace WebCore
    171