text: /*
   * Copyright 2019, 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 _ANDROID_MEDIA_STREAMS_H_
  #define _ANDROID_MEDIA_STREAMS_H_
  
  #include "src/piex_types.h"
  #include "src/piex.h"
  
  #include <jni.h>
  #include <nativehelper/JNIHelp.h>
  #include <utils/KeyedVector.h>
  #include <utils/String8.h>
  #include <utils/StrongPointer.h>
  #include <SkStream.h>
  
  
  namespace android {
  
  class AssetStream : public piex::StreamInterface {
  private:
      SkStream *mStream;
      size_t mPosition;
  
  public:
      explicit AssetStream(SkStream* stream);
      ~AssetStream();
  
      // Reads 'length' amount of bytes from 'offset' to 'data'. The 'data' buffer
      // provided by the caller, guaranteed to be at least "length" bytes long.
      // On 'kOk' the 'data' pointer contains 'length' valid bytes beginning at
      // 'offset' bytes from the start of the stream.
      // Returns 'kFail' if 'offset' + 'length' exceeds the stream and does not
      // change the contents of 'data'.
      piex::Error GetData(
              const size_t offset, const size_t length, std::uint8_t* data) override;
  };
  
  class BufferedStream : public piex::StreamInterface {
  private:
      SkStream *mStream;
      // Growable memory stream
      SkDynamicMemoryWStream mStreamBuffer;
  
      // Minimum size to read on filling the buffer.
      const size_t kMinSizeToRead = 8192;
  
  public:
      explicit BufferedStream(SkStream* stream);
      ~BufferedStream();
  
      // Reads 'length' amount of bytes from 'offset' to 'data'. The 'data' buffer
      // provided by the caller, guaranteed to be at least "length" bytes long.
      // On 'kOk' the 'data' pointer contains 'length' valid bytes beginning at
      // 'offset' bytes from the start of the stream.
      // Returns 'kFail' if 'offset' + 'length' exceeds the stream and does not
      // change the contents of 'data'.
      piex::Error GetData(
              const size_t offset, const size_t length, std::uint8_t* data) override;
  };
  
  class FileStream : public piex::StreamInterface {
  private:
      FILE *mFile;
      size_t mPosition;
  
  public:
      explicit FileStream(const int fd);
      explicit FileStream(const String8 filename);
      ~FileStream();
  
      // Reads 'length' amount of bytes from 'offset' to 'data'. The 'data' buffer
      // provided by the caller, guaranteed to be at least "length" bytes long.
      // On 'kOk' the 'data' pointer contains 'length' valid bytes beginning at
      // 'offset' bytes from the start of the stream.
      // Returns 'kFail' if 'offset' + 'length' exceeds the stream and does not
      // change the contents of 'data'.
      piex::Error GetData(
              const size_t offset, const size_t length, std::uint8_t* data) override;
      bool exists() const;
  };
  
  // Reads EXIF metadata from a given raw image via piex.
  // And returns true if the operation is successful; otherwise, false.
  bool GetExifFromRawImage(
          piex::StreamInterface* stream, const String8& filename, piex::PreviewImageData& image_data);
  
  // Returns true if the conversion is successful; otherwise, false.
  bool ConvertKeyValueArraysToKeyedVector(
          JNIEnv *env, jobjectArray keys, jobjectArray values,
          KeyedVector<String8, String8>* vector);
  
  struct AMessage;
  status_t ConvertMessageToMap(
          JNIEnv *env, const sp<AMessage> &msg, jobject *map);
  
  status_t ConvertKeyValueArraysToMessage(
          JNIEnv *env, jobjectArray keys, jobjectArray values,
          sp<AMessage> *msg);
  
  };  // namespace android
  
  #endif //  _ANDROID_MEDIA_STREAMS_H_
  