Source/WebCore/contentextensions/ContentExtensionRule.cpp

/*
 * Copyright (C) 2014, 2015 Apple 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:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS 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 APPLE INC. OR ITS 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 "ContentExtensionRule.h"

#if ENABLE(CONTENT_EXTENSIONS)

namespace WebCore {

namespace ContentExtensions {

ContentExtensionRule::ContentExtensionRule(const Trigger& trigger, const Action& action)
    : m_trigger(trigger)
    , m_action(action)
{
    ASSERT(!m_trigger.urlFilter.isEmpty());
}

Action Action::deserialize(const SerializedActionByte* actions, const uint32_t actionsLength, uint32_t location)
{
    RELEASE_ASSERT(location < actionsLength);
    switch (static_cast<ActionType>(actions[location])) {
    case ActionType::BlockCookies:
        return Action(ActionType::BlockCookies, location);
    case ActionType::BlockLoad:
        return Action(ActionType::BlockLoad, location);
    case ActionType::IgnorePreviousRules:
        return Action(ActionType::IgnorePreviousRules, location);
    case ActionType::MakeHTTPS:
        return Action(ActionType::MakeHTTPS, location);
    case ActionType::CSSDisplayNoneSelector: {
        uint32_t headerLength = sizeof(ActionType) + sizeof(uint32_t) + sizeof(bool);
        uint32_t stringStartIndex = location + headerLength;
        RELEASE_ASSERT(actionsLength >= stringStartIndex);
        uint32_t selectorLength = *reinterpret_cast<const unsigned*>(&actions[location + sizeof(ActionType)]);
        bool wideCharacters = actions[location + sizeof(ActionType) + sizeof(uint32_t)];
        
        if (wideCharacters) {
            RELEASE_ASSERT(actionsLength >= stringStartIndex + selectorLength * sizeof(UChar));
            return Action(ActionType::CSSDisplayNoneSelector, String(reinterpret_cast<const UChar*>(&actions[stringStartIndex]), selectorLength), location);
        }
        RELEASE_ASSERT(actionsLength >= stringStartIndex + selectorLength * sizeof(LChar));
        return Action(ActionType::CSSDisplayNoneSelector, String(reinterpret_cast<const LChar*>(&actions[stringStartIndex]), selectorLength), location);
    }
    case ActionType::CSSDisplayNoneStyleSheet:
    case ActionType::InvalidAction:
    default:
        RELEASE_ASSERT_NOT_REACHED();
    }
}
    
ActionType Action::deserializeType(const SerializedActionByte* actions, const uint32_t actionsLength, uint32_t location)
{
    RELEASE_ASSERT(location < actionsLength);
    ActionType type = static_cast<ActionType>(actions[location]);
    switch (type) {
    case ActionType::BlockCookies:
    case ActionType::BlockLoad:
    case ActionType::IgnorePreviousRules:
    case ActionType::CSSDisplayNoneSelector:
    case ActionType::MakeHTTPS:
        return type;
    case ActionType::CSSDisplayNoneStyleSheet:
    case ActionType::InvalidAction:
    default:
        RELEASE_ASSERT_NOT_REACHED();
    }
}
    
uint32_t Action::serializedLength(const SerializedActionByte* actions, const uint32_t actionsLength, uint32_t location)
{
    RELEASE_ASSERT(location < actionsLength);
    switch (static_cast<ActionType>(actions[location])) {
    case ActionType::BlockCookies:
    case ActionType::BlockLoad:
    case ActionType::IgnorePreviousRules:
    case ActionType::MakeHTTPS:
        return sizeof(ActionType);
    case ActionType::CSSDisplayNoneSelector: {
        uint32_t headerLength = sizeof(ActionType) + sizeof(uint32_t) + sizeof(bool);
        uint32_t stringStartIndex = location + headerLength;
        RELEASE_ASSERT(actionsLength >= stringStartIndex);
        uint32_t selectorLength = *reinterpret_cast<const unsigned*>(&actions[location + sizeof(ActionType)]);
        bool wideCharacters = actions[location + sizeof(ActionType) + sizeof(uint32_t)];
        
        if (wideCharacters)
            return headerLength + selectorLength * sizeof(UChar);
        return headerLength + selectorLength * sizeof(LChar);
    }
    case ActionType::CSSDisplayNoneStyleSheet:
    case ActionType::InvalidAction:
    default:
        RELEASE_ASSERT_NOT_REACHED();
    }
}

} // namespace ContentExtensions

} // namespace WebCore

#endif // ENABLE(CONTENT_EXTENSIONS)