JSBlobCustom.cpp   [plain text]

/*
 * Copyright (C) 2012 Google Inc. All rights reserved.
 *
 * 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,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "config.h"
#include "JSBlob.h"

#include "Blob.h"
#include "ExceptionCode.h"
#include "ExceptionCodePlaceholder.h"
#include "JSArrayBuffer.h"
#include "JSDOMBinding.h"
#include "JSDictionary.h"
#include "JSFile.h"
#include "WebKitBlobBuilder.h"
#include <runtime/Error.h>
#include <runtime/JSArray.h>
#include <wtf/Assertions.h>

using namespace JSC;

namespace WebCore {

JSValue toJS(ExecState* exec, JSDOMGlobalObject* globalObject, Blob* blob)
{
    if (!blob)
        return jsNull();

    if (blob->isFile())
        return CREATE_DOM_WRAPPER(exec, globalObject, File, blob);

    return CREATE_DOM_WRAPPER(exec, globalObject, Blob, blob);
}

EncodedJSValue JSC_HOST_CALL JSBlobConstructor::constructJSBlob(ExecState* exec)
{
    JSBlobConstructor* jsConstructor = jsCast<JSBlobConstructor*>(exec->callee());
    ScriptExecutionContext* context = jsConstructor->scriptExecutionContext();
    if (!context)
        return throwVMError(exec, createReferenceError(exec, "Blob constructor associated document is unavailable"));

    if (!exec->argumentCount()) {
        RefPtr<Blob> blob = Blob::create();
        return JSValue::encode(CREATE_DOM_WRAPPER(exec, jsConstructor->globalObject(), Blob, blob.get()));
    }

    JSValue firstArg = exec->argument(0);
    if (!isJSArray(firstArg))
        return throwVMError(exec, createTypeError(exec, "First argument of the constructor is not of type Array"));

    String type;
    String endings = "transparent";

    if (exec->argumentCount() > 1) {
        JSValue blobPropertyBagValue = exec->argument(1);

        if (!blobPropertyBagValue.isObject())
            return throwVMError(exec, createTypeError(exec, "Second argument of the constructor is not of type Object"));

        // Given the above test, this will always yield an object.
        JSObject* blobPropertyBagObject = blobPropertyBagValue.toObject(exec);

        // Create the dictionary wrapper from the initializer object.
        JSDictionary dictionary(exec, blobPropertyBagObject);

        // Attempt to get the endings property and validate it.
        bool containsEndings = dictionary.get("endings", endings);
        if (exec->hadException())
            return JSValue::encode(jsUndefined());

        if (containsEndings) {
            if (endings != "transparent" && endings != "native")
                return throwVMError(exec, createTypeError(exec, "The endings property must be either \"transparent\" or \"native\""));
        }

        // Attempt to get the type property.
        dictionary.get("type", type);
        if (exec->hadException())
            return JSValue::encode(jsUndefined());
    }

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

    // FIXME: this would be better if the WebKitBlobBuilder were a stack object to avoid the allocation.
    RefPtr<WebKitBlobBuilder> blobBuilder = WebKitBlobBuilder::create();

    JSArray* array = asArray(firstArg);
    unsigned length = array->length();

    for (unsigned i = 0; i < length; ++i) {
        JSValue item = array->getIndex(i);
#if ENABLE(BLOB)
        if (item.inherits(&JSArrayBuffer::s_info))
            blobBuilder->append(toArrayBuffer(item));
        else
#endif
        if (item.inherits(&JSBlob::s_info))
            blobBuilder->append(toBlob(item));
        else {
            String string = ustringToString(item.toString(exec)->value(exec));
            if (exec->hadException())
                return JSValue::encode(jsUndefined());
            blobBuilder->append(string, endings, ASSERT_NO_EXCEPTION);
        }
    }

    RefPtr<Blob> blob = blobBuilder->getBlob(type);
    return JSValue::encode(CREATE_DOM_WRAPPER(exec, jsConstructor->globalObject(), Blob, blob.get()));
}

} // namespace WebCore