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)
, 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.
this->Okay = (*this) ? true : false;
}
cmGeneratedFileStream& 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.
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.
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()
: Name()
, TempName()
, CopyIfDifferent(false)
, Okay(false)
, Compress(false)
, CompressExtraExtension(true)
{
}
cmGeneratedFileStreamBase::cmGeneratedFileStreamBase(const char* name)
: 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.
cmSystemTools::RemoveFile(this->TempName);
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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";
}
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// Only consider replacing the destination file if no error
// occurred.
if (!this->Name.empty() && this->Okay &&
(!this->CopyIfDifferent ||
cmSystemTools::FilesDiffer(this->TempName, resname))) {
// The destination is to be replaced. Rename the temporary to the
// destination atomically.
if (this->Compress) {
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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);
} else {
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this->RenameFile(this->TempName.c_str(), resname.c_str());
}
replaced = true;
}
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// Else, the destination was not replaced.
//
// Always delete the temporary file. We never want it to stay around.
cmSystemTools::RemoveFile(this->TempName);
return replaced;
}
#ifdef CMAKE_BUILD_WITH_CMAKE
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int cmGeneratedFileStreamBase::CompressFile(const char* oldname,
const char* newname)
{
gzFile gf = gzopen(newname, "w");
if (!gf) {
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return 0;
}
FILE* ifs = cmsys::SystemTools::Fopen(oldname, "r");
if (!ifs) {
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return 0;
}
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size_t res;
const size_t BUFFER_SIZE = 1024;
char buffer[BUFFER_SIZE];
while ((res = fread(buffer, 1, BUFFER_SIZE, ifs)) > 0) {
if (!gzwrite(gf, buffer, static_cast<int>(res))) {
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fclose(ifs);
gzclose(gf);
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return 0;
}
}
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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 std::string& fname)
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{
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this->Name = fname;
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}