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diff --git a/src/piex.h b/src/piex.h
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--- a/src/piex.h
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-// Copyright 2015 Google Inc.
-//
-// 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.
-//
-////////////////////////////////////////////////////////////////////////////////
-//
-// The purpose of the preview-image-extractor (piex) is to find and extract the
-// largest JPEG compressed preview image contained in a RAW file.
-//
-// Even for unsupported RAW files we want to provide high quality images using a
-// dedicated, small and portable library. That is possible by taking the preview
-// image contained in all RAW files.
-//
-// Typically a preview image is stored as JPEG compressed, full size (or at
-// least half size) image in a RAW file.
-//
-// A typical client code snippet:
-//
-//   // In C++
-//   PreviewImageData image_data;
-//   unique_ptr<StreamInterface> data_stream(new DataStream(file));
-//   Error err = GetPreviewImageData(data_stream.get(), &image_data));
-//   if (err == Error::kFail) {
-//     // The input data seems to be broken.
-//     return;
-//   } else if (err == Error::kUnsupported) {
-//     // The input data is not supported.
-//     return;
-//   }
-//
-//   // Uncompress the JPEG as usual, e.g. on Android with the BitmapFactory:
-//   // In Java
-//   Bitmap bitmap = BitmapFactory.decodeByteArray(
-//       file.at(image_data.preview_offset), image_data.preview_length);
-
-#ifndef PIEX_PIEX_H_
-#define PIEX_PIEX_H_
-
-#include <string>
-#include <vector>
-
-#include "src/image_type_recognition/image_type_recognition_lite.h"
-#include "src/piex_types.h"
-
-namespace piex {
-
-// Returns the maximum number of bytes IsRaw() will read from the stream.
-size_t BytesRequiredForIsRaw();
-
-// Returns true if 'data' contains a RAW file format, even if it is not
-// supported by Piex, false otherwise. Reads at most BytesRequiredForIsRaw()
-// from the stream.
-bool IsRaw(StreamInterface* data);
-
-// Gets the largest JPEG compressed preview image data. On success
-// 'preview_image_data' contains image metadata, the unverified length and the
-// offset to a JPEG compressed image from the beginning of the file.
-//
-// Returns 'kFail' when something with the data is wrong.
-// Returns 'kUnsupported' if file format is not supported.
-//
-// One could check the "preview_image_data->preview_length != 0" for the
-// existance of a preview image.
-//
-// Updates output_type based on data, if output_type is non-null.
-Error GetPreviewImageData(
-    StreamInterface* data, PreviewImageData* preview_image_data,
-    image_type_recognition::RawImageTypes* output_type = nullptr);
-
-// Returns true if the full width and height and the mosaic pattern dimension of
-// a DNG image could be obtained. False otherwise.
-bool GetDngInformation(StreamInterface* data, std::uint32_t* width,
-                       std::uint32_t* height,
-                       std::vector<std::uint32_t>* cfa_pattern_dim);
-
-// Returns true if Exif orientation for the image can be obtained. False
-// otherwise.
-bool GetOrientation(StreamInterface* data, std::uint32_t* orientation);
-
-// Returns a vector of upper case file extensions, which are used as a first
-// step to quickly guess a supported file format.
-std::vector<std::string> SupportedExtensions();
-
-}  // namespace piex
-
-#endif  // PIEX_PIEX_H_