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      1 /*
      2  * Copyright (C) 2010 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 _MTP_STRING_BUFFER_H
     18 #define _MTP_STRING_BUFFER_H
     19 
     20 #include <stdint.h>
     21 
     22 // Max Character number of a MTP String
     23 #define MTP_STRING_MAX_CHARACTER_NUMBER             255
     24 
     25 namespace android {
     26 
     27 class MtpDataPacket;
     28 
     29 // Represents a utf8 string, with a maximum of 255 characters
     30 class MtpStringBuffer {
     31 
     32 private:
     33     // mBuffer contains string in UTF8 format
     34     // maximum 3 bytes/character, with 1 extra for zero termination
     35     uint8_t         mBuffer[MTP_STRING_MAX_CHARACTER_NUMBER * 3 + 1];
     36     int             mCharCount;
     37     int             mByteCount;
     38 
     39 public:
     40                     MtpStringBuffer();
     41                     MtpStringBuffer(const char* src);
     42                     MtpStringBuffer(const uint16_t* src);
     43                     MtpStringBuffer(const MtpStringBuffer& src);
     44     virtual         ~MtpStringBuffer();
     45 
     46     void            set(const char* src);
     47     void            set(const uint16_t* src);
     48 
     49     bool            readFromPacket(MtpDataPacket* packet);
     50     void            writeToPacket(MtpDataPacket* packet) const;
     51 
     52     inline int      getCharCount() const { return mCharCount; }
     53     inline int      getByteCount() const { return mByteCount; }
     54 
     55 	inline operator const char*() const { return (const char *)mBuffer; }
     56 };
     57 
     58 }; // namespace android
     59 
     60 #endif // _MTP_STRING_BUFFER_H
     61