CMake/Source/cmGeneratedFileStream.cxx

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/*============================================================================
CMake - Cross Platform Makefile Generator
Copyright 2000-2009 Kitware, Inc., Insight Software Consortium
Distributed under the OSI-approved BSD License (the "License");
see accompanying file Copyright.txt for details.
This software is distributed WITHOUT ANY WARRANTY; without even the
implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the License for more information.
============================================================================*/
#include "cmGeneratedFileStream.h"
#include "cmSystemTools.h"
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#if defined(CMAKE_BUILD_WITH_CMAKE)
# include <cm_zlib.h>
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#endif
//----------------------------------------------------------------------------
cmGeneratedFileStream::cmGeneratedFileStream():
cmGeneratedFileStreamBase(), Stream()
{
}
//----------------------------------------------------------------------------
cmGeneratedFileStream::cmGeneratedFileStream(const char* name, bool quiet):
cmGeneratedFileStreamBase(name),
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Stream(TempName.c_str())
{
// Check if the file opened.
if(!*this && !quiet)
{
cmSystemTools::Error("Cannot open file for write: ",
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this->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.
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this->Okay = (*this)?true:false;
}
//----------------------------------------------------------------------------
cmGeneratedFileStream&
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cmGeneratedFileStream::Open(const char* name, bool quiet, bool binaryFlag)
{
// Store the file name and construct the temporary file name.
this->cmGeneratedFileStreamBase::Open(name);
// Open the temporary output file.
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if ( binaryFlag )
{
this->Stream::open(this->TempName.c_str(),
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std::ios::out | std::ios::binary);
}
else
{
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this->Stream::open(this->TempName.c_str(), std::ios::out);
}
// Check if the file opened.
if(!*this && !quiet)
{
cmSystemTools::Error("Cannot open file for write: ",
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this->TempName.c_str());
cmSystemTools::ReportLastSystemError("");
}
return *this;
}
//----------------------------------------------------------------------------
bool
cmGeneratedFileStream::Close()
{
// Save whether the temporary output file is valid before closing.
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this->Okay = (*this)?true:false;
// Close the temporary output file.
this->Stream::close();
// Remove the temporary file (possibly by renaming to the real file).
return this->cmGeneratedFileStreamBase::Close();
}
//----------------------------------------------------------------------------
void cmGeneratedFileStream::SetCopyIfDifferent(bool copy_if_different)
{
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this->CopyIfDifferent = copy_if_different;
}
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//----------------------------------------------------------------------------
void cmGeneratedFileStream::SetCompression(bool compression)
{
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this->Compress = compression;
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}
//----------------------------------------------------------------------------
void cmGeneratedFileStream::SetCompressionExtraExtension(bool ext)
{
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this->CompressExtraExtension = ext;
}
//----------------------------------------------------------------------------
cmGeneratedFileStreamBase::cmGeneratedFileStreamBase():
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Name(),
TempName(),
CopyIfDifferent(false),
Okay(false),
Compress(false),
CompressExtraExtension(true)
{
}
//----------------------------------------------------------------------------
cmGeneratedFileStreamBase::cmGeneratedFileStreamBase(const char* name):
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Name(),
TempName(),
CopyIfDifferent(false),
Okay(false),
Compress(false),
CompressExtraExtension(true)
{
this->Open(name);
}
//----------------------------------------------------------------------------
cmGeneratedFileStreamBase::~cmGeneratedFileStreamBase()
{
this->Close();
}
//----------------------------------------------------------------------------
void cmGeneratedFileStreamBase::Open(const char* name)
{
// Save the original name of the file.
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this->Name = name;
// Create the name of the temporary file.
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this->TempName = name;
#if defined(__VMS)
this->TempName += "_tmp";
#else
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this->TempName += ".tmp";
#endif
// 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);
cmSystemTools::MakeDirectory(dir.c_str());
}
//----------------------------------------------------------------------------
bool cmGeneratedFileStreamBase::Close()
{
bool replaced = false;
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std::string resname = this->Name;
if ( this->Compress && this->CompressExtraExtension )
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{
resname += ".gz";
}
// Only consider replacing the destination file if no error
// occurred.
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if(!this->Name.empty() &&
this->Okay &&
(!this->CopyIfDifferent ||
cmSystemTools::FilesDiffer(this->TempName.c_str(), resname.c_str())))
{
// The destination is to be replaced. Rename the temporary to the
// destination atomically.
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if ( this->Compress )
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{
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std::string gzname = this->TempName + ".temp.gz";
if ( this->CompressFile(this->TempName.c_str(), gzname.c_str()) )
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{
this->RenameFile(gzname.c_str(), resname.c_str());
}
cmSystemTools::RemoveFile(gzname.c_str());
}
else
{
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this->RenameFile(this->TempName.c_str(), resname.c_str());
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}
replaced = true;
}
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// Else, the destination was not replaced.
//
// Always delete the temporary file. We never want it to stay around.
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cmSystemTools::RemoveFile(this->TempName.c_str());
return replaced;
}
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//----------------------------------------------------------------------------
#ifdef CMAKE_BUILD_WITH_CMAKE
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int cmGeneratedFileStreamBase::CompressFile(const char* oldname,
const char* newname)
{
gzFile gf = gzopen(newname, "w");
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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 )
{
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if ( !gzwrite(gf, buffer, static_cast<int>(res)) )
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{
fclose(ifs);
gzclose(gf);
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return 0;
}
}
fclose(ifs);
gzclose(gf);
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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)
{
return cmSystemTools::RenameFile(oldname, newname);
}
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//----------------------------------------------------------------------------
void cmGeneratedFileStream::SetName(const char* fname)
{
if ( !fname )
{
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this->Name = "";
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return;
}
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this->Name = fname;
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}