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 #ifndef _IO_STREAM_MEMINPUTSTREAM_H_ 17 #define _IO_STREAM_MEMINPUTSTREAM_H_ 18 19 #include "InputStream.h" 20 21 namespace parselib { 22 23 /** 24 * A concrete implementation of InputStream for a memory buffer data source 25 */ 26 class MemInputStream : public InputStream { 27 public: 28 /** constructor. Caller is presumed to have allocated and filled the memory buffer */ MemInputStream(unsigned char * buff,int32_t len)29 MemInputStream(unsigned char *buff, int32_t len) : mBuffer(buff), mBufferLen(len), mPos(0) {} ~MemInputStream()30 virtual ~MemInputStream() {} 31 32 virtual int32_t read(void *buff, int32_t numBytes); 33 34 virtual int32_t peek(void *buff, int32_t numBytes); 35 36 virtual void advance(int32_t numBytes); 37 38 virtual int32_t getPos(); 39 40 virtual void setPos(int32_t pos); 41 42 private: 43 /** Points to the data buffer to stream from. */ 44 unsigned char *mBuffer; 45 46 /** Total number of bytes in the memory buffer */ 47 int32_t mBufferLen; 48 49 /** The index of the next byte to read */ 50 int32_t mPos; 51 }; 52 53 } // namespace parselib 54 55 #endif // _IO_STREAM_MEMINPUTSTREAM_H_ 56