1 /* 2 * Copyright 2019, The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef _ANDROID_MEDIA_STREAMS_H_ 18 #define _ANDROID_MEDIA_STREAMS_H_ 19 20 #include "src/piex_types.h" 21 #include "src/piex.h" 22 23 #include <jni.h> 24 #include <nativehelper/JNIHelp.h> 25 #include <utils/KeyedVector.h> 26 #include <utils/String8.h> 27 #include <utils/StrongPointer.h> 28 29 namespace android { 30 31 class FileStream : public piex::StreamInterface { 32 private: 33 FILE *mFile; 34 size_t mPosition; 35 36 public: 37 explicit FileStream(const int fd); 38 explicit FileStream(const String8 filename); 39 ~FileStream(); 40 41 // Reads 'length' amount of bytes from 'offset' to 'data'. The 'data' buffer 42 // provided by the caller, guaranteed to be at least "length" bytes long. 43 // On 'kOk' the 'data' pointer contains 'length' valid bytes beginning at 44 // 'offset' bytes from the start of the stream. 45 // Returns 'kFail' if 'offset' + 'length' exceeds the stream and does not 46 // change the contents of 'data'. 47 piex::Error GetData( 48 const size_t offset, const size_t length, std::uint8_t* data) override; 49 bool exists() const; 50 }; 51 52 // Reads EXIF metadata from a given raw image via piex. 53 // And returns true if the operation is successful; otherwise, false. 54 bool GetExifFromRawImage( 55 piex::StreamInterface* stream, const String8& filename, piex::PreviewImageData& image_data); 56 57 // Returns true if the conversion is successful; otherwise, false. 58 bool ConvertKeyValueArraysToKeyedVector( 59 JNIEnv *env, jobjectArray keys, jobjectArray values, 60 KeyedVector<String8, String8>* vector); 61 62 struct AMessage; 63 status_t ConvertMessageToMap( 64 JNIEnv *env, const sp<AMessage> &msg, jobject *map); 65 66 status_t ConvertKeyValueArraysToMessage( 67 JNIEnv *env, jobjectArray keys, jobjectArray values, 68 sp<AMessage> *msg); 69 70 }; // namespace android 71 72 #endif // _ANDROID_MEDIA_STREAMS_H_ 73