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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 "bindings/v8/V8NPUtils.h"
     33 
     34 #include "bindings/v8/NPV8Object.h"
     35 #include "bindings/v8/V8Binding.h"
     36 #include "bindings/v8/V8NPObject.h"
     37 #include "bindings/v8/npruntime_impl.h"
     38 #include "bindings/v8/npruntime_priv.h"
     39 #include "core/frame/DOMWindow.h"
     40 #include "wtf/text/WTFString.h"
     41 
     42 #include <stdlib.h>
     43 
     44 namespace WebCore {
     45 
     46 void convertV8ObjectToNPVariant(v8::Local<v8::Value> object, NPObject* owner, NPVariant* result, v8::Isolate* isolate)
     47 {
     48     VOID_TO_NPVARIANT(*result);
     49 
     50     // It is really the caller's responsibility to deal with the empty handle case because there could be different actions to
     51     // take in different contexts.
     52     ASSERT(!object.IsEmpty());
     53 
     54     if (object.IsEmpty())
     55         return;
     56 
     57     if (object->IsNumber())
     58         DOUBLE_TO_NPVARIANT(object->NumberValue(), *result);
     59     else if (object->IsBoolean())
     60         BOOLEAN_TO_NPVARIANT(object->BooleanValue(), *result);
     61     else if (object->IsNull())
     62         NULL_TO_NPVARIANT(*result);
     63     else if (object->IsUndefined())
     64         VOID_TO_NPVARIANT(*result);
     65     else if (object->IsString()) {
     66         v8::Handle<v8::String> str = object.As<v8::String>();
     67         int length = str->Utf8Length() + 1;
     68         char* utf8Chars = reinterpret_cast<char*>(malloc(length));
     69         str->WriteUtf8(utf8Chars, length, 0, v8::String::HINT_MANY_WRITES_EXPECTED);
     70         STRINGN_TO_NPVARIANT(utf8Chars, length-1, *result);
     71     } else if (object->IsObject()) {
     72         DOMWindow* window = toDOMWindow(isolate->GetCurrentContext());
     73         NPObject* npobject = npCreateV8ScriptObject(0, v8::Handle<v8::Object>::Cast(object), window, isolate);
     74         if (npobject)
     75             _NPN_RegisterObject(npobject, owner);
     76         OBJECT_TO_NPVARIANT(npobject, *result);
     77     }
     78 }
     79 
     80 v8::Handle<v8::Value> convertNPVariantToV8Object(const NPVariant* variant, NPObject* owner, v8::Isolate* isolate)
     81 {
     82     NPVariantType type = variant->type;
     83 
     84     switch (type) {
     85     case NPVariantType_Int32:
     86         return v8::Integer::New(NPVARIANT_TO_INT32(*variant), isolate);
     87     case NPVariantType_Double:
     88         return v8::Number::New(isolate, NPVARIANT_TO_DOUBLE(*variant));
     89     case NPVariantType_Bool:
     90         return v8Boolean(NPVARIANT_TO_BOOLEAN(*variant), isolate);
     91     case NPVariantType_Null:
     92         return v8::Null(isolate);
     93     case NPVariantType_Void:
     94         return v8::Undefined(isolate);
     95     case NPVariantType_String: {
     96         NPString src = NPVARIANT_TO_STRING(*variant);
     97         return v8::String::NewFromUtf8(isolate, src.UTF8Characters, v8::String::kNormalString, src.UTF8Length);
     98     }
     99     case NPVariantType_Object: {
    100         NPObject* object = NPVARIANT_TO_OBJECT(*variant);
    101         if (V8NPObject* v8Object = npObjectToV8NPObject(object))
    102             return v8::Local<v8::Object>::New(isolate, v8Object->v8Object);
    103         return createV8ObjectForNPObject(object, owner, isolate);
    104     }
    105     default:
    106         return v8::Undefined(isolate);
    107     }
    108 }
    109 
    110 // Helper function to create an NPN String Identifier from a v8 string.
    111 NPIdentifier getStringIdentifier(v8::Handle<v8::String> str)
    112 {
    113     const int kStackBufferSize = 100;
    114 
    115     int bufferLength = str->Utf8Length() + 1;
    116     if (bufferLength <= kStackBufferSize) {
    117         // Use local stack buffer to avoid heap allocations for small strings. Here we should only use the stack space for
    118         // stackBuffer when it's used, not when we use the heap.
    119         //
    120         // WriteUtf8 is guaranteed to generate a null-terminated string because bufferLength is constructed to be one greater
    121         // than the string length.
    122         char stackBuffer[kStackBufferSize];
    123         str->WriteUtf8(stackBuffer, bufferLength);
    124         return _NPN_GetStringIdentifier(stackBuffer);
    125     }
    126 
    127     v8::String::Utf8Value utf8(str);
    128     return _NPN_GetStringIdentifier(*utf8);
    129 }
    130 
    131 struct ExceptionHandlerInfo {
    132     ExceptionHandlerInfo* previous;
    133     ExceptionHandler handler;
    134     void* data;
    135 };
    136 
    137 static ExceptionHandlerInfo* topHandler;
    138 
    139 void pushExceptionHandler(ExceptionHandler handler, void* data)
    140 {
    141     ExceptionHandlerInfo* info = new ExceptionHandlerInfo;
    142     info->previous = topHandler;
    143     info->handler = handler;
    144     info->data = data;
    145     topHandler = info;
    146 }
    147 
    148 void popExceptionHandler()
    149 {
    150     ASSERT(topHandler);
    151     ExceptionHandlerInfo* doomed = topHandler;
    152     topHandler = topHandler->previous;
    153     delete doomed;
    154 }
    155 
    156 ExceptionCatcher::ExceptionCatcher()
    157 {
    158     if (!topHandler)
    159         m_tryCatch.SetVerbose(true);
    160 }
    161 
    162 ExceptionCatcher::~ExceptionCatcher()
    163 {
    164     if (!m_tryCatch.HasCaught())
    165         return;
    166 
    167     if (topHandler)
    168         topHandler->handler(topHandler->data, *v8::String::Utf8Value(m_tryCatch.Exception()));
    169 }
    170 
    171 } // namespace WebCore
    172