PLearn 0.1
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00001 // -*- C++ -*- 00002 00003 // PLearn (A C++ Machine Learning Library) 00004 // Copyright (C) 1998 Pascal Vincent 00005 // Copyright (C) 1999-2002 Pascal Vincent, Yoshua Bengio and University of Montreal 00006 // Copyright (C) 2006 Xavier Saint-Mleux 00007 // 00008 00009 // Redistribution and use in source and binary forms, with or without 00010 // modification, are permitted provided that the following conditions are met: 00011 // 00012 // 1. Redistributions of source code must retain the above copyright 00013 // notice, this list of conditions and the following disclaimer. 00014 // 00015 // 2. Redistributions in binary form must reproduce the above copyright 00016 // notice, this list of conditions and the following disclaimer in the 00017 // documentation and/or other materials provided with the distribution. 00018 // 00019 // 3. The name of the authors may not be used to endorse or promote 00020 // products derived from this software without specific prior written 00021 // permission. 00022 // 00023 // THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR 00024 // IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 00025 // OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN 00026 // NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 00027 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED 00028 // TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 00029 // PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 00030 // LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 00031 // NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 00032 // SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 00033 // 00034 // This file is part of the PLearn library. For more information on the PLearn 00035 // library, go to the PLearn Web site at www.plearn.org 00036 00037 00038 #include "BufferedIntVecFile.h" 00039 00040 namespace PLearn { 00041 using namespace std; 00042 00043 /* 00044 BufferedIntVecFile::BufferedIntVecFile(const IntVecFile& other) 00045 : filename(other.filename), f(0), length_(other.length_), 00046 version_number_(other.version_number_), endianness_(other.endianness_) 00047 { 00048 open(filename, false / * readonly * /); 00049 } 00050 */ 00051 00052 void BufferedIntVecFile::open(const string& the_filename, bool readwrite) 00053 { 00054 flush(); 00055 inherited::open(the_filename, readwrite); 00056 bufstart= -1; 00057 bufmod= false; 00058 } 00059 00060 void BufferedIntVecFile::close() 00061 { 00062 flush(); 00063 inherited::close(); 00064 } 00065 00066 int BufferedIntVecFile::get(int i) const 00067 { 00068 if(bufstart < 0 || bufstart > i || i >= bufstart+buflen) 00069 const_cast<BufferedIntVecFile*>(this)->getBuf(i); 00070 return buf[i-bufstart]; 00071 } 00072 00073 void BufferedIntVecFile::put(int i, int value) 00074 { 00075 if(bufstart < 0 || bufstart > i || i >= bufstart+buflen) 00076 getBuf(i); 00077 bufmod= true; 00078 buf[i-bufstart]= value; 00079 if(i>=length_) 00080 length_ = i+1; 00081 } 00082 00083 00084 BufferedIntVecFile::~BufferedIntVecFile() 00085 { 00086 close(); 00087 if(buf) delete[] buf; 00088 } 00089 00090 void BufferedIntVecFile::getBuf(int bufstart_) 00091 { 00092 flush(); 00093 bufstart= bufstart_; 00094 for(int i= 0; i < buflen && i+bufstart < length(); ++i) 00095 buf[i]= inherited::get(i+bufstart); 00096 } 00097 00098 void BufferedIntVecFile::flush() 00099 { 00100 /* 00101 if(bufmod) 00102 for(int i= 0; i < buflen && i+bufstart < length(); ++i) 00103 inherited::put(i+bufstart, buf[i]); 00104 */ 00105 00106 if(bufmod) 00107 { 00108 int len= min(buflen, length()-bufstart); 00109 seek_to_index(bufstart); 00110 if (byte_order() != endianness_) 00111 { 00112 TVec<int> new_vec(len); 00113 new_vec.copyFrom(buf, len); 00114 endianswap(new_vec.data(), new_vec.length()); 00115 fwrite(new_vec.data(), sizeof(int), new_vec.length(), f); 00116 } 00117 else 00118 { 00119 fwrite(buf, sizeof(int), len, f); 00120 } 00121 } 00122 00123 bufmod= false; 00124 } 00125 00126 00127 } // end of namespace PLearn 00128 00129 00130 00131 /* 00132 Local Variables: 00133 mode:c++ 00134 c-basic-offset:4 00135 c-file-style:"stroustrup" 00136 c-file-offsets:((innamespace . 0)(inline-open . 0)) 00137 indent-tabs-mode:nil 00138 fill-column:79 00139 End: 00140 */ 00141 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=79 :