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
43namespace WebCore {
44
45void 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
79v8::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.
110NPIdentifier 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
130struct ExceptionHandlerInfo {
131    ExceptionHandlerInfo* previous;
132    ExceptionHandler handler;
133    void* data;
134};
135
136static ExceptionHandlerInfo* topHandler;
137
138void 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
147void popExceptionHandler()
148{
149    ASSERT(topHandler);
150    ExceptionHandlerInfo* doomed = topHandler;
151    topHandler = topHandler->previous;
152    delete doomed;
153}
154
155ExceptionCatcher::ExceptionCatcher()
156{
157    if (!topHandler)
158        m_tryCatch.SetVerbose(true);
159}
160
161ExceptionCatcher::~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