third_party/WebKit/Source/bindings/core/v8/V8NPUtils.cpp

/*
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 * modification, are permitted provided that the following conditions are
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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#include "bindings/core/v8/V8NPUtils.h"

#include "bindings/core/v8/NPV8Object.h"
#include "bindings/core/v8/V8Binding.h"
#include "bindings/core/v8/V8NPObject.h"
#include "bindings/core/v8/npruntime_impl.h"
#include "bindings/core/v8/npruntime_priv.h"
#include "core/frame/LocalDOMWindow.h"
#include "wtf/text/WTFString.h"

#include <stdlib.h>

namespace blink {

void convertV8ObjectToNPVariant(v8::Isolate* isolate, v8::Local<v8::Value> object, NPObject* owner, NPVariant* result)
{
    VOID_TO_NPVARIANT(*result);

    // It is really the caller's responsibility to deal with the empty handle case because there could be different actions to
    // take in different contexts.
    ASSERT(!object.IsEmpty());

    if (object.IsEmpty())
        return;

    if (object->IsNumber()) {
        DOUBLE_TO_NPVARIANT(object.As<v8::Number>()->Value(), *result);
    } else if (object->IsBoolean()) {
        BOOLEAN_TO_NPVARIANT(object.As<v8::Boolean>()->Value(), *result);
    } else if (object->IsNull()) {
        NULL_TO_NPVARIANT(*result);
    } else if (object->IsUndefined()) {
        VOID_TO_NPVARIANT(*result);
    } else if (object->IsString()) {
        v8::Local<v8::String> str = object.As<v8::String>();
        int length = str->Utf8Length() + 1;
        char* utf8Chars = reinterpret_cast<char*>(malloc(length));
        str->WriteUtf8(utf8Chars, length, 0, v8::String::HINT_MANY_WRITES_EXPECTED);
        STRINGN_TO_NPVARIANT(utf8Chars, length-1, *result);
    } else if (object->IsObject()) {
        LocalDOMWindow* window = currentDOMWindow(isolate);
        NPObject* npobject = npCreateV8ScriptObject(isolate, 0, v8::Local<v8::Object>::Cast(object), window);
        if (npobject)
            _NPN_RegisterObject(npobject, owner);
        OBJECT_TO_NPVARIANT(npobject, *result);
    }
}

v8::Local<v8::Value> convertNPVariantToV8Object(v8::Isolate* isolate, const NPVariant* variant, NPObject* owner)
{
    NPVariantType type = variant->type;

    switch (type) {
    case NPVariantType_Int32:
        return v8::Integer::New(isolate, NPVARIANT_TO_INT32(*variant));
    case NPVariantType_Double:
        return v8::Number::New(isolate, NPVARIANT_TO_DOUBLE(*variant));
    case NPVariantType_Bool:
        return v8Boolean(NPVARIANT_TO_BOOLEAN(*variant), isolate);
    case NPVariantType_Null:
        return v8::Null(isolate);
    case NPVariantType_Void:
        return v8::Undefined(isolate);
    case NPVariantType_String: {
        NPString src = NPVARIANT_TO_STRING(*variant);
        return v8AtomicString(isolate, src.UTF8Characters, src.UTF8Length);
    }
    case NPVariantType_Object: {
        NPObject* object = NPVARIANT_TO_OBJECT(*variant);
        if (V8NPObject* v8Object = npObjectToV8NPObject(object))
            return v8::Local<v8::Object>::New(isolate, v8Object->v8Object);
        return createV8ObjectForNPObject(isolate, object, owner);
    }
    default:
        return v8::Undefined(isolate);
    }
}

// Helper function to create an NPN String Identifier from a v8 string.
NPIdentifier getStringIdentifier(v8::Local<v8::String> str)
{
    const int kStackBufferSize = 100;

    int bufferLength = str->Utf8Length() + 1;
    if (bufferLength <= kStackBufferSize) {
        // Use local stack buffer to avoid heap allocations for small strings. Here we should only use the stack space for
        // stackBuffer when it's used, not when we use the heap.
        //
        // WriteUtf8 is guaranteed to generate a null-terminated string because bufferLength is constructed to be one greater
        // than the string length.
        char stackBuffer[kStackBufferSize];
        str->WriteUtf8(stackBuffer, bufferLength);
        return _NPN_GetStringIdentifier(stackBuffer);
    }

    v8::String::Utf8Value utf8(str);
    return _NPN_GetStringIdentifier(*utf8);
}

} // namespace blink