1 /* 2 * Copyright (C) 2013 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 _CHARACTER_ENCODING_DETECTOR_H 18 #define _CHARACTER_ENCODING_DETECTOR_H 19 20 #include <media/mediascanner.h> 21 22 #include "StringArray.h" 23 24 /** Declare opaque structures from ICU4C. */ 25 struct UConverter; 26 typedef struct UConverter UConverter; 27 28 struct UCharsetMatch; 29 typedef struct UCharsetMatch UCharsetMatch; 30 31 namespace android { 32 33 class CharacterEncodingDetector { 34 35 public: 36 CharacterEncodingDetector(); 37 ~CharacterEncodingDetector(); 38 39 void addTag(const char *name, const char *value); 40 size_t size(); 41 42 void detectAndConvert(); 43 status_t getTag(int index, const char **name, const char**value); 44 45 private: 46 const UCharsetMatch *getPreferred( 47 const char *input, size_t len, 48 const UCharsetMatch** ucma, size_t matches, 49 bool *goodmatch, int *highestmatch); 50 51 bool isFrequent(const uint16_t *values, uint32_t c); 52 53 // cached name and value strings, for native encoding support. 54 // TODO: replace these with byte blob arrays that don't require the data to be 55 // singlenullbyte-terminated 56 StringArray mNames; 57 StringArray mValues; 58 59 UConverter* mUtf8Conv; 60 const char* mLocaleEnc; 61 }; 62 63 64 65 }; // namespace android 66 67 #endif 68