Id3TagsRemover.h

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/*
 * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License").
 * You may not use this file except in compliance with the License.
 * A copy of the License is located at
 *
 *     http://aws.amazon.com/apache2.0/
 *
 * or in the "license" file accompanying this file. This file is distributed
 * on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
 * express or implied. See the License for the specific language governing
 * permissions and limitations under the License.
 */

#ifndef ALEXA_CLIENT_SDK_PLAYLISTPARSER_INCLUDE_PLAYLISTPARSER_ID3TAGSREMOVER_H_
#define ALEXA_CLIENT_SDK_PLAYLISTPARSER_INCLUDE_PLAYLISTPARSER_ID3TAGSREMOVER_H_

#include <atomic>
#include <cstddef>
#include <memory>
#include <vector>

#include <AVSCommon/AVS/Attachment/InProcessAttachment.h>
#include <AVSCommon/AVS/Attachment/InProcessAttachmentReader.h>
#include <AVSCommon/AVS/Attachment/InProcessAttachmentWriter.h>
#include <AVSCommon/Utils/RequiresShutdown.h>

namespace alexaClientSDK {
namespace playlistParser {

class Id3TagsRemover : public avsCommon::utils::RequiresShutdown {
public:
    using ByteVector = std::vector<unsigned char>;

    Id3TagsRemover();

    void doShutdown() override;

    bool removeTagsAndWrite(
        const std::shared_ptr<avsCommon::avs::attachment::InProcessAttachment>& attachment,
        const std::shared_ptr<avsCommon::avs::attachment::AttachmentWriter>& streamWriter);

    void stripID3Tags(ByteVector& buffer);

private:
    struct Context {
        ByteVector remainingBuffer;

        std::size_t remainingBytesToStrip;

        bool isBufferComplete;

        Context() : remainingBytesToStrip{0}, isBufferComplete{false} {};
    };

    void stripID3Tags(ByteVector& buffer, Context& context);

    bool writeBufferToWriter(
        const ByteVector& buffer,
        const std::shared_ptr<avsCommon::avs::attachment::AttachmentWriter>& writer);

    std::atomic<bool> m_shuttingDown;
};

}  // namespace playlistParser
}  // namespace alexaClientSDK

#endif  // ALEXA_CLIENT_SDK_PLAYLISTPARSER_INCLUDE_PLAYLISTPARSER_ID3TAGSREMOVER_H_