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/*
* Copyright (C) 2017 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License 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 PRIVACY_BUFFER_H
#define PRIVACY_BUFFER_H
#include "Privacy.h"
#include <android/util/EncodedBuffer.h>
#include <android/util/ProtoOutputStream.h>
#include <stdint.h>
#include <utils/Errors.h>
using namespace android;
using namespace android::util;
/**
* PrivacyBuffer holds the original protobuf data and strips PII-sensitive fields
* based on the request and holds stripped data in its own buffer for output.
*/
class PrivacyBuffer
{
public:
PrivacyBuffer(const Privacy* policy, EncodedBuffer::iterator& data);
~PrivacyBuffer();
/**
* Strip based on the request and hold data in its own buffer. Return NO_ERROR if strip succeeds.
*/
status_t strip(const PrivacySpec& spec);
/**
* Clear encoded buffer so it can be reused by another request.
*/
void clear();
/**
* Return the size of the stripped data.
*/
size_t size() const;
/**
* Flush buffer to the given fd. NO_ERROR is returned if the flush succeeds.
*/
status_t flush(int fd);
private:
const Privacy* mPolicy;
EncodedBuffer::iterator& mData;
ProtoOutputStream mProto;
size_t mSize;
status_t stripField(const Privacy* parentPolicy, const PrivacySpec& spec);
void writeFieldOrSkip(uint32_t fieldTag, bool skip);
};
#endif // PRIVACY_BUFFER_H
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