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/* Distributed under the OSI-approved BSD 3-Clause License. See accompanying
file Copyright.txt or https://cmake.org/licensing for details. */
#include "cmGeneratedFileStream.h"
#include <stdio.h>
#include "cmSystemTools.h"
#if defined(CMAKE_BUILD_WITH_CMAKE)
# include "cm_codecvt.hxx"
# include "cm_zlib.h"
#endif
cmGeneratedFileStream::cmGeneratedFileStream(Encoding encoding)
{
#ifdef CMAKE_BUILD_WITH_CMAKE
if (encoding != codecvt::None) {
imbue(std::locale(getloc(), new codecvt(encoding)));
}
#else
static_cast<void>(encoding);
#endif
}
cmGeneratedFileStream::cmGeneratedFileStream(std::string const& name,
bool quiet, Encoding encoding)
: cmGeneratedFileStreamBase(name)
, Stream(TempName.c_str())
{
// Check if the file opened.
if (!*this && !quiet) {
cmSystemTools::Error("Cannot open file for write: ",
this->TempName.c_str());
cmSystemTools::ReportLastSystemError("");
}
#ifdef CMAKE_BUILD_WITH_CMAKE
if (encoding != codecvt::None) {
imbue(std::locale(getloc(), new codecvt(encoding)));
}
#else
static_cast<void>(encoding);
#endif
}
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->fail();
}
cmGeneratedFileStream& cmGeneratedFileStream::Open(std::string const& 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(),
std::ios::out | std::ios::binary);
} else {
this->Stream::open(this->TempName.c_str());
}
// Check if the file opened.
if (!*this && !quiet) {
cmSystemTools::Error("Cannot open file for write: ",
this->TempName.c_str());
cmSystemTools::ReportLastSystemError("");
}
return *this;
}
bool cmGeneratedFileStream::Close()
{
// Save whether the temporary output file is valid before closing.
this->Okay = !this->fail();
// 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)
{
this->CopyIfDifferent = copy_if_different;
}
void cmGeneratedFileStream::SetCompression(bool compression)
{
this->Compress = compression;
}
void cmGeneratedFileStream::SetCompressionExtraExtension(bool ext)
{
this->CompressExtraExtension = ext;
}
cmGeneratedFileStreamBase::cmGeneratedFileStreamBase()
: CopyIfDifferent(false)
, Okay(false)
, Compress(false)
, CompressExtraExtension(true)
{
}
cmGeneratedFileStreamBase::cmGeneratedFileStreamBase(std::string const& name)
: CopyIfDifferent(false)
, Okay(false)
, Compress(false)
, CompressExtraExtension(true)
{
this->Open(name);
}
cmGeneratedFileStreamBase::~cmGeneratedFileStreamBase()
{
this->Close();
}
void cmGeneratedFileStreamBase::Open(std::string const& name)
{
// Save the original name of the file.
this->Name = name;
// Create the name of the temporary file.
this->TempName = name;
#if defined(__VMS)
this->TempName += "_tmp";
#else
this->TempName += ".tmp";
#endif
// Make sure the temporary file that will be used is not present.
cmSystemTools::RemoveFile(this->TempName);
std::string dir = cmSystemTools::GetFilenamePath(this->TempName);
cmSystemTools::MakeDirectory(dir);
}
bool cmGeneratedFileStreamBase::Close()
{
bool replaced = false;
std::string resname = this->Name;
if (this->Compress && this->CompressExtraExtension) {
resname += ".gz";
}
// 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) {
std::string gzname = this->TempName + ".temp.gz";
if (this->CompressFile(this->TempName, gzname)) {
this->RenameFile(gzname, resname);
}
cmSystemTools::RemoveFile(gzname);
} else {
this->RenameFile(this->TempName, resname);
}
replaced = true;
}
// 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
int cmGeneratedFileStreamBase::CompressFile(std::string const& oldname,
std::string const& newname)
{
gzFile gf = gzopen(newname.c_str(), "w");
if (!gf) {
return 0;
}
FILE* ifs = cmsys::SystemTools::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 (!gzwrite(gf, buffer, static_cast<int>(res))) {
fclose(ifs);
gzclose(gf);
return 0;
}
}
fclose(ifs);
gzclose(gf);
return 1;
}
#else
int cmGeneratedFileStreamBase::CompressFile(std::string const&,
std::string const&)
{
return 0;
}
#endif
int cmGeneratedFileStreamBase::RenameFile(std::string const& oldname,
std::string const& newname)
{
return cmSystemTools::RenameFile(oldname.c_str(), newname.c_str());
}
void cmGeneratedFileStream::SetName(const std::string& fname)
{
this->Name = fname;
}
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