V8BlobCustom.cpp   [plain text]

/*
 * Copyright (C) 2012 Google Inc. All rights reserved.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
 *     * Neither the name of Google Inc. nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "config.h"
#include "Blob.h"

#include "Dictionary.h"
#include "V8ArrayBuffer.h"
#include "V8Binding.h"
#include "V8BindingMacros.h"
#include "V8Blob.h"
#include "V8File.h"
#include "V8Proxy.h"
#include "V8Utilities.h"
#include "WebKitBlobBuilder.h"
#include <wtf/RefPtr.h>

namespace WebCore {

v8::Handle<v8::Value> toV8(Blob* impl, v8::Isolate* isolate)
{
    if (!impl)
        return v8::Null();

    if (impl->isFile())
        return toV8(static_cast<File*>(impl), isolate);

    return V8Blob::wrap(impl, isolate);
}

v8::Handle<v8::Value> V8Blob::constructorCallback(const v8::Arguments& args)
{
    INC_STATS("DOM.Blob.Constructor");

    if (!args.IsConstructCall())
        return throwError("DOM object constructor cannot be called as a function.", V8Proxy::TypeError);

    if (ConstructorMode::current() == ConstructorMode::WrapExistingObject)
        return args.Holder();

    // Get the script execution context.
    ScriptExecutionContext* context = getScriptExecutionContext();
    if (!context)
        return throwError("Blob constructor associated document is unavailable", V8Proxy::ReferenceError);

    if (!args.Length()) {
        RefPtr<Blob> blob = Blob::create();
        return toV8(blob.get(), args.GetIsolate());
    }

    v8::Local<v8::Value> firstArg = args[0];
    if (!firstArg->IsArray())
        return throwError("First argument of the constructor is not of type Array", V8Proxy::TypeError);

    String type;
    String endings = "transparent";

    if (args.Length() > 1) {
        if (!args[1]->IsObject())
            return throwError("Second argument of the constructor is not of type Object", V8Proxy::TypeError);

        Dictionary dictionary(args[1]);

        v8::TryCatch tryCatchEndings;
        bool containsEndings = dictionary.get("endings", endings);
        if (tryCatchEndings.HasCaught())
            return throwError(tryCatchEndings.Exception());

        if (containsEndings) {
            if (endings != "transparent" && endings != "native")
                return throwError("The endings property must be either \"transparent\" or \"native\"", V8Proxy::TypeError);
        }

        v8::TryCatch tryCatchType;
        dictionary.get("type", type);
        if (tryCatchType.HasCaught())
            return throwError(tryCatchType.Exception());
    }

    ASSERT(endings == "transparent" || endings == "native");

    RefPtr<WebKitBlobBuilder> blobBuilder = WebKitBlobBuilder::create();

    EXCEPTION_BLOCK(v8::Local<v8::Array>, blobParts, v8::Local<v8::Array>::Cast(firstArg));
    uint32_t length = blobParts->Length();

    for (uint32_t i = 0; i < length; ++i) {
        v8::Local<v8::Value> item = blobParts->Get(v8::Uint32::New(i));
        ASSERT(!item.IsEmpty());
#if ENABLE(BLOB)
        if (V8ArrayBuffer::HasInstance(item)) {
            ArrayBuffer* arrayBuffer = V8ArrayBuffer::toNative(v8::Handle<v8::Object>::Cast(item));
            ASSERT(arrayBuffer);
            blobBuilder->append(arrayBuffer);
        } else
#endif
        if (V8Blob::HasInstance(item)) {
            Blob* blob = V8Blob::toNative(v8::Handle<v8::Object>::Cast(item));
            ASSERT(blob);
            blobBuilder->append(blob);
        } else {
            EXCEPTION_BLOCK(String, stringValue, toWebCoreString(item->ToString()));
            blobBuilder->append(stringValue, endings, ASSERT_NO_EXCEPTION);
        }
    }

    RefPtr<Blob> blob = blobBuilder->getBlob(type);
    return toV8(blob.get(), args.GetIsolate());
}

} // namespace WebCore