CMake/Source/cmGeneratedFileStream.cxx

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