1 /* 2 * BlockBufferedFileBinaryInputOutputPort.h - 3 * 4 * Copyright (c) 2009 Higepon(Taro Minowa) <higepon@users.sourceforge.jp> 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 18 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 19 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 20 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 21 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 22 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED 23 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 24 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 25 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 26 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 27 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 * 29 * $Id: BlockBufferedFileBinaryInputOutputPort.h 261 2008-07-25 06:16:44Z higepon $ 30 */ 31 32 #ifndef SCHEME_BLOCKBUFFERED_FILE_BINARY_INPUT_OUTPUT_PORT_ 33 #define SCHEME_BLOCKBUFFERED_FILE_BINARY_INPUT_OUTPUT_PORT_ 34 35 #include "OSCompat.h" 36 #include "BufferedFileBinaryInputOutputPort.h" 37 38 namespace scheme { 39 40 class BlockBufferedFileBinaryInputOutputPort : public BufferedFileBinaryInputOutputPort 41 { 42 public: BlockBufferedFileBinaryInputOutputPort(const ucs4string & filename,int openFlags)43 BlockBufferedFileBinaryInputOutputPort(const ucs4string& filename, int openFlags) : 44 BufferedFileBinaryInputOutputPort(filename, openFlags) {} ~BlockBufferedFileBinaryInputOutputPort()45 virtual ~BlockBufferedFileBinaryInputOutputPort() {} 46 47 protected: 48 // N.B. writeToFile doesn't change the fd's position. writeToBuffer(uint8_t * data,int64_t reqSize)49 int64_t writeToBuffer(uint8_t* data, int64_t reqSize) 50 { 51 if (reqSize > 0) { 52 isDirty_ = true; 53 } 54 int64_t writeSize = 0; 55 const int64_t origPositon = file_->seek(0, File::Current); 56 MOSH_ASSERT(origPositon >= 0); 57 bool needUnwind = false; 58 59 while (writeSize < reqSize) { 60 MOSH_ASSERT(BUF_SIZE >= bufferIndex_); 61 const int64_t bufferRestSize = BUF_SIZE - bufferIndex_; 62 MOSH_ASSERT(reqSize > writeSize); 63 const int64_t restSize = reqSize - writeSize; 64 if (bufferRestSize >= restSize) { 65 moshMemcpy(buffer_ + bufferIndex_, data + writeSize, restSize); 66 bufferIndex_ += restSize; 67 writeSize += restSize; 68 } else { 69 moshMemcpy(buffer_ + bufferIndex_, data + writeSize, bufferRestSize); 70 bufferIndex_ += bufferRestSize; 71 writeSize += bufferRestSize; 72 internalFlush(); 73 needUnwind = true; 74 } 75 } 76 if (needUnwind) { 77 file_->seek(origPositon); 78 } 79 return writeSize; 80 } 81 }; 82 83 } // namespace scheme 84 85 #endif // SCHEME_BLOCKBUFFERED_FILE_BINARY_INPUT_OUTPUT_PORT_ 86