/*
 * Copyright (C) 2014 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 "platform/TestingPlatformSupport.h"

namespace blink {

TestingDiscardableMemory::TestingDiscardableMemory(size_t size) : m_data(size), m_isLocked(true)
{
}

TestingDiscardableMemory::~TestingDiscardableMemory()
{
}

bool TestingDiscardableMemory::lock()
{
    ASSERT(!m_isLocked);
    m_isLocked = true;
    return false;
}

void* TestingDiscardableMemory::data()
{
    ASSERT(m_isLocked);
    return m_data.data();
}

void TestingDiscardableMemory::unlock()
{
    ASSERT(m_isLocked);
    m_isLocked = false;
    // Force eviction to catch clients not correctly checking the return value of lock().
    memset(m_data.data(), 0, m_data.size());
}

TestingPlatformSupport::TestingPlatformSupport(const Config& config)
    : m_config(config)
    , m_oldPlatform(Platform::current())
{
    Platform::initialize(this);
}

TestingPlatformSupport::~TestingPlatformSupport()
{
    Platform::initialize(m_oldPlatform);
}

WebDiscardableMemory* TestingPlatformSupport::allocateAndLockDiscardableMemory(size_t bytes)
{
    return !m_config.hasDiscardableMemorySupport ? 0 : new TestingDiscardableMemory(bytes);
}

void TestingPlatformSupport::cryptographicallyRandomValues(unsigned char* buffer, size_t length)
{
}

const unsigned char* TestingPlatformSupport::getTraceCategoryEnabledFlag(const char* categoryName)
{
    static const unsigned char tracingIsDisabled = 0;
    return &tracingIsDisabled;
}

} // namespace blink