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314 lines
8.9 KiB
314 lines
8.9 KiB
/*=========================================================================
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Program: CMake - Cross-Platform Makefile Generator
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Module: $RCSfile: cmGeneratedFileStream.cxx,v $
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Language: C++
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Date: $Date: 2007-11-16 12:01:58 $
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Version: $Revision: 1.19 $
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Copyright (c) 2002 Kitware, Inc., Insight Consortium. All rights reserved.
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See Copyright.txt or http://www.cmake.org/HTML/Copyright.html for details.
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This software is distributed WITHOUT ANY WARRANTY; without even
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the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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PURPOSE. See the above copyright notices for more information.
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=========================================================================*/
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#include "cmGeneratedFileStream.h"
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#include "cmSystemTools.h"
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// Includes needed for implementation of RenameFile. This is not in
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// system tools because it is not implemented robustly enough to move
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// files across directories.
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#ifdef _WIN32
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# include <windows.h>
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# include <sys/stat.h>
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#endif
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#if defined(CMAKE_BUILD_WITH_CMAKE)
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# include <cm_zlib.h>
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#endif
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//----------------------------------------------------------------------------
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cmGeneratedFileStream::cmGeneratedFileStream():
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cmGeneratedFileStreamBase(), Stream()
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{
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}
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//----------------------------------------------------------------------------
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cmGeneratedFileStream::cmGeneratedFileStream(const char* name, bool quiet):
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cmGeneratedFileStreamBase(name),
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Stream(TempName.c_str())
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{
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// Check if the file opened.
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if(!*this && !quiet)
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{
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cmSystemTools::Error("Cannot open file for write: ",
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this->TempName.c_str());
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cmSystemTools::ReportLastSystemError("");
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}
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}
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//----------------------------------------------------------------------------
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cmGeneratedFileStream::~cmGeneratedFileStream()
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{
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// This is the first destructor called. Check the status of the
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// stream and give the information to the private base. Next the
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// stream will be destroyed which will close the temporary file.
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// Finally the base destructor will be called to replace the
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// destination file.
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this->Okay = (*this)?true:false;
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}
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//----------------------------------------------------------------------------
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cmGeneratedFileStream&
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cmGeneratedFileStream::Open(const char* name, bool quiet, bool binaryFlag)
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{
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// Store the file name and construct the temporary file name.
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this->cmGeneratedFileStreamBase::Open(name);
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// Open the temporary output file.
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if ( binaryFlag )
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{
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this->Stream::open(this->TempName.c_str(),
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std::ios::out | std::ios::binary);
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}
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else
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{
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this->Stream::open(this->TempName.c_str(), std::ios::out);
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}
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// Check if the file opened.
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if(!*this && !quiet)
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{
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cmSystemTools::Error("Cannot open file for write: ",
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this->TempName.c_str());
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cmSystemTools::ReportLastSystemError("");
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}
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return *this;
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}
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//----------------------------------------------------------------------------
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bool
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cmGeneratedFileStream::Close()
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{
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// Save whether the temporary output file is valid before closing.
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this->Okay = (*this)?true:false;
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// Close the temporary output file.
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this->Stream::close();
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// Remove the temporary file (possibly by renaming to the real file).
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return this->cmGeneratedFileStreamBase::Close();
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}
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//----------------------------------------------------------------------------
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void cmGeneratedFileStream::SetCopyIfDifferent(bool copy_if_different)
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{
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this->CopyIfDifferent = copy_if_different;
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}
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//----------------------------------------------------------------------------
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void cmGeneratedFileStream::SetCompression(bool compression)
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{
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this->Compress = compression;
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}
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//----------------------------------------------------------------------------
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void cmGeneratedFileStream::SetCompressionExtraExtension(bool ext)
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{
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this->CompressExtraExtension = ext;
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}
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//----------------------------------------------------------------------------
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cmGeneratedFileStreamBase::cmGeneratedFileStreamBase():
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Name(),
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TempName(),
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CopyIfDifferent(false),
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Okay(false),
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Compress(false),
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CompressExtraExtension(true)
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{
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}
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//----------------------------------------------------------------------------
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cmGeneratedFileStreamBase::cmGeneratedFileStreamBase(const char* name):
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Name(),
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TempName(),
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CopyIfDifferent(false),
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Okay(false),
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Compress(false),
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CompressExtraExtension(true)
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{
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this->Open(name);
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}
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//----------------------------------------------------------------------------
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cmGeneratedFileStreamBase::~cmGeneratedFileStreamBase()
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{
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this->Close();
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}
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//----------------------------------------------------------------------------
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void cmGeneratedFileStreamBase::Open(const char* name)
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{
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// Save the original name of the file.
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this->Name = name;
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// Create the name of the temporary file.
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this->TempName = name;
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this->TempName += ".tmp";
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// Make sure the temporary file that will be used is not present.
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cmSystemTools::RemoveFile(this->TempName.c_str());
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std::string dir = cmSystemTools::GetFilenamePath(this->TempName);
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cmSystemTools::MakeDirectory(dir.c_str());
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}
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//----------------------------------------------------------------------------
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bool cmGeneratedFileStreamBase::Close()
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{
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bool replaced = false;
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std::string resname = this->Name;
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if ( this->Compress && this->CompressExtraExtension )
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{
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resname += ".gz";
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}
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// Only consider replacing the destination file if no error
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// occurred.
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if(!this->Name.empty() &&
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this->Okay &&
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(!this->CopyIfDifferent ||
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cmSystemTools::FilesDiffer(this->TempName.c_str(), resname.c_str())))
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{
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// The destination is to be replaced. Rename the temporary to the
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// destination atomically.
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if ( this->Compress )
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{
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std::string gzname = this->TempName + ".temp.gz";
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if ( this->CompressFile(this->TempName.c_str(), gzname.c_str()) )
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{
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this->RenameFile(gzname.c_str(), resname.c_str());
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}
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cmSystemTools::RemoveFile(gzname.c_str());
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}
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else
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{
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this->RenameFile(this->TempName.c_str(), resname.c_str());
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}
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replaced = true;
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}
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// Else, the destination was not replaced.
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//
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// Always delete the temporary file. We never want it to stay around.
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cmSystemTools::RemoveFile(this->TempName.c_str());
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return replaced;
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}
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//----------------------------------------------------------------------------
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#ifdef CMAKE_BUILD_WITH_CMAKE
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int cmGeneratedFileStreamBase::CompressFile(const char* oldname,
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const char* newname)
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{
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gzFile gf = gzopen(newname, "w");
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if ( !gf )
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{
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return 0;
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}
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FILE* ifs = fopen(oldname, "r");
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if ( !ifs )
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{
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return 0;
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}
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size_t res;
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const size_t BUFFER_SIZE = 1024;
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char buffer[BUFFER_SIZE];
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while ( (res = fread(buffer, 1, BUFFER_SIZE, ifs)) > 0 )
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{
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if ( !gzwrite(gf, buffer, static_cast<int>(res)) )
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{
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fclose(ifs);
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gzclose(gf);
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return 0;
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}
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}
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fclose(ifs);
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gzclose(gf);
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return 1;
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}
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#else
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int cmGeneratedFileStreamBase::CompressFile(const char*, const char*)
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{
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return 0;
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}
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#endif
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//----------------------------------------------------------------------------
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int cmGeneratedFileStreamBase::RenameFile(const char* oldname,
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const char* newname)
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{
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#ifdef _WIN32
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/* On Windows the move functions will not replace existing files.
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Check if the destination exists. */
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struct stat newFile;
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if(stat(newname, &newFile) == 0)
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{
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/* The destination exists. We have to replace it carefully. The
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MoveFileEx function does what we need but is not available on
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Win9x. */
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OSVERSIONINFO osv;
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DWORD attrs;
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/* Make sure the destination is not read only. */
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attrs = GetFileAttributes(newname);
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if(attrs & FILE_ATTRIBUTE_READONLY)
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{
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SetFileAttributes(newname, attrs & ~FILE_ATTRIBUTE_READONLY);
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}
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/* Check the windows version number. */
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osv.dwOSVersionInfoSize = sizeof(osv);
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GetVersionEx(&osv);
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if(osv.dwPlatformId == VER_PLATFORM_WIN32_WINDOWS)
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{
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/* This is Win9x. There is no MoveFileEx implementation. We
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cannot quite rename the file atomically. Just delete the
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destination and then move the file. */
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DeleteFile(newname);
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return MoveFile(oldname, newname);
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}
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else
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{
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/* This is not Win9x. Use the MoveFileEx implementation. */
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return MoveFileEx(oldname, newname, MOVEFILE_REPLACE_EXISTING);
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}
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}
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else
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{
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/* The destination does not exist. Just move the file. */
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return MoveFile(oldname, newname);
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}
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#else
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/* On UNIX we have an OS-provided call to do this atomically. */
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return rename(oldname, newname) == 0;
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#endif
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}
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//----------------------------------------------------------------------------
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void cmGeneratedFileStream::SetName(const char* fname)
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{
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if ( !fname )
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{
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this->Name = "";
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return;
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}
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this->Name = fname;
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}
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