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Speed up TextFileWriter a bit

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Write the text and the newline separately rather than appending the
newline to the text to eliminate a copy of the text.
This commit is contained in:
Thomas Goyne 2014-04-30 06:50:42 -07:00 committed by Thomas Goyne
parent 4366ece827
commit 7a5c92aaee
2 changed files with 25 additions and 13 deletions
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35
src/text_file_writer.cpp
View file

@ -30,14 +30,23 @@
#include <boost/algorithm/string/predicate.hpp>
#include <boost/filesystem.hpp>
#ifdef _WIN32
#define NEWLINE "\r\n"
#else
#define NEWLINE "\n"
#endif
TextFileWriter::TextFileWriter(agi::fs::path const& filename, std::string encoding)
: file(new agi::io::Save(filename, true))
, ostr(file->Get())
, newline(NEWLINE)
{
if (encoding.empty())
encoding = OPT_GET("App/Save Charset")->GetString();
if (boost::iequals(encoding, "utf-8"))
if (boost::iequals(encoding, "utf-8")) {
conv = agi::make_unique<agi::charset::IconvWrapper>("utf-8", encoding.c_str(), true);
newline = conv->Convert(newline);
}
try {
// Write the BOM
@ -48,7 +57,10 @@ TextFileWriter::TextFileWriter(agi::fs::path const& filename, std::string encodi
}
}
TextFileWriter::TextFileWriter(std::ostream &ostr) : ostr(ostr) {
TextFileWriter::TextFileWriter(std::ostream &ostr)
: ostr(ostr)
, newline(NEWLINE)
{
WriteLineToFile("\xEF\xBB\xBF", false);
}
@ -56,15 +68,14 @@ TextFileWriter::~TextFileWriter() {
// Explicit empty destructor required with a unique_ptr to an incomplete class
}
void TextFileWriter::WriteLineToFile(std::string line, bool addLineBreak) {
if (addLineBreak)
#ifdef _WIN32
line += "\r\n";
#else
line += "\n";
#endif
if (conv)
line = conv->Convert(line);
void TextFileWriter::WriteLineToFile(std::string const& line, bool addLineBreak) {
if (conv) {
auto converted = conv->Convert(line);
ostr.write(converted.data(), converted.size());
}
else
ostr.write(line.data(), line.size());
if (addLineBreak)
ostr.write(newline.data(), newline.size());
}

3
src/text_file_writer.h
View file

@ -33,11 +33,12 @@ class TextFileWriter {
std::unique_ptr<agi::io::Save> file;
std::unique_ptr<agi::charset::IconvWrapper> conv;
std::ostream &ostr;
std::string newline;
public:
TextFileWriter(agi::fs::path const& filename, std::string encoding="");
TextFileWriter(std::ostream &ostr);
~TextFileWriter();
void WriteLineToFile(std::string line, bool addLineBreak=true);
void WriteLineToFile(std::string const& line, bool addLineBreak=true);
};