Visualization Library v1.0.3A lightweight C++ OpenGL middleware for 2D/3D graphics |
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00001 /**************************************************************************************/ 00002 /* */ 00003 /* Visualization Library */ 00004 /* http://visualizationlibrary.org */ 00005 /* */ 00006 /* Copyright (c) 2005-2010, Michele Bosi */ 00007 /* All rights reserved. */ 00008 /* */ 00009 /* Redistribution and use in source and binary forms, with or without modification, */ 00010 /* are permitted provided that the following conditions are met: */ 00011 /* */ 00012 /* - Redistributions of source code must retain the above copyright notice, this */ 00013 /* list of conditions and the following disclaimer. */ 00014 /* */ 00015 /* - Redistributions in binary form must reproduce the above copyright notice, this */ 00016 /* list of conditions and the following disclaimer in the documentation and/or */ 00017 /* other materials provided with the distribution. */ 00018 /* */ 00019 /* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND */ 00020 /* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED */ 00021 /* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE */ 00022 /* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR */ 00023 /* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES */ 00024 /* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; */ 00025 /* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON */ 00026 /* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT */ 00027 /* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS */ 00028 /* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ 00029 /* */ 00030 /**************************************************************************************/ 00031 00032 #include <vlCore/MemoryFile.hpp> 00033 #include <vlCore/Log.hpp> 00034 00035 using namespace vl; 00036 00037 //--------------------------------------------------------------------------- 00038 // MemoryFile 00039 //--------------------------------------------------------------------------- 00040 MemoryFile::MemoryFile() 00041 { 00042 mBuffer = new Buffer; 00043 mPtr = 0; 00044 mIsOpen = false; 00045 } 00046 //--------------------------------------------------------------------------- 00047 bool MemoryFile::open(EOpenMode mode) 00048 { 00049 if ( isOpen() ) 00050 { 00051 Log::error("MemoryFile::open(): file already open.\n"); 00052 return false; 00053 } 00054 00055 // for now support only OM_ReadOnly mode 00056 mIsOpen = (mode == OM_ReadOnly); 00057 return mIsOpen; 00058 } 00059 //--------------------------------------------------------------------------- 00060 void MemoryFile::copy(VirtualFile* file) 00061 { 00062 if (file->isOpen()) 00063 file->close(); 00064 00065 allocateBuffer(file->size()); 00066 00067 file->open(OM_ReadOnly); 00068 00069 file->read( ptr(), size() ); 00070 00071 file->close(); 00072 } 00073 //--------------------------------------------------------------------------- 00074 long long MemoryFile::position_Implementation() const 00075 { 00076 if (!isOpen()) 00077 return -1; 00078 return mPtr; 00079 } 00080 //--------------------------------------------------------------------------- 00081 long long MemoryFile::read_Implementation(void* buffer, long long byte_count) 00082 { 00083 if (!isOpen()) 00084 return 0; 00085 if ( mBuffer->bytesUsed() ) 00086 { 00087 long long bytes_left = mBuffer->bytesUsed() - mPtr; 00088 byte_count = byte_count < bytes_left ? byte_count : bytes_left; 00089 memcpy(buffer, ptr() + mPtr, (size_t)byte_count); 00090 mPtr += byte_count; 00091 return byte_count; 00092 } 00093 else 00094 { 00095 // no error is generated for an empty memory stream 00096 return 0; 00097 } 00098 } 00099 //--------------------------------------------------------------------------- 00100 bool MemoryFile::seekSet_Implementation(long long offset) 00101 { 00102 if (!isOpen()) 00103 return false; 00104 mPtr = offset; 00105 if (mPtr < 0) mPtr = 0; 00106 if (mPtr > static_cast<long long>(mBuffer->bytesUsed())) 00107 mPtr = mBuffer->bytesUsed(); 00108 return true; 00109 } 00110 //----------------------------------------------------------------------------- 00111 ref<VirtualFile> MemoryFile::clone() const 00112 { 00113 ref<MemoryFile> file = new MemoryFile; 00114 file->operator=(*this); 00115 return file; 00116 } 00117 //---------------------------------------------------------------------------