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speed up reading wxFileConfig from wxInputStream by factors of 3.5, 20 and 7 for ANSI/wchar_t/UTF-8 builds respectively (replaces patch 1755969)

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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@47555 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Vadim Zeitlin
2007-07-18 23:37:12 +00:00
parent 7a3ba5af83
commit 5ad2b5ce07
1 changed files with 44 additions and 55 deletions
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99
src/common/fileconf.cpp
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@@ -437,70 +437,59 @@ wxFileConfig::wxFileConfig(wxInputStream &inStream, const wxMBConv& conv)
m_linesTail = NULL;
// read the entire stream contents in memory
wxString str;
wxWxCharBuffer cbuf;
static const size_t chunkLen = 1024;
wxMemoryBuffer buf(chunkLen);
do
{
static const size_t chunkLen = 1024;
inStream.Read(buf.GetAppendBuf(chunkLen), chunkLen);
buf.UngetAppendBuf(inStream.LastRead());
wxMemoryBuffer buf(chunkLen);
do
const wxStreamError err = inStream.GetLastError();
if ( err != wxSTREAM_NO_ERROR && err != wxSTREAM_EOF )
{
inStream.Read(buf.GetAppendBuf(chunkLen), chunkLen);
buf.UngetAppendBuf(inStream.LastRead());
const wxStreamError err = inStream.GetLastError();
if ( err != wxSTREAM_NO_ERROR && err != wxSTREAM_EOF )
{
wxLogError(_("Error reading config options."));
break;
}
wxLogError(_("Error reading config options."));
break;
}
while ( !inStream.Eof() );
}
while ( !inStream.Eof() );
#if wxUSE_UNICODE
size_t len;
str = conv.cMB2WC((char *)buf.GetData(), buf.GetDataLen(), &len);
if ( !len && buf.GetDataLen() )
{
wxLogError(_("Failed to read config options."));
}
#else // !wxUSE_UNICODE
// no need for conversion
str.assign((char *)buf.GetData(), buf.GetDataLen());
#endif // wxUSE_UNICODE/!wxUSE_UNICODE
}
// translate everything to the current (platform-dependent) line
// termination character
str = wxTextBuffer::Translate(str);
wxMemoryText memText;
// Now we can add the text to the memory text. To do this we extract line
// by line from the translated string, until we've reached the end.
//
// VZ: all this is horribly inefficient, we should do the translation on
// the fly in one pass saving both memory and time (TODO)
const wxChar *pEOL = wxTextBuffer::GetEOL(wxTextBuffer::typeDefault);
const size_t EOLLen = wxStrlen(pEOL);
int posLineStart = str.Find(pEOL);
while ( posLineStart != -1 )
size_t len;
cbuf = conv.cMB2WC((char *)buf.GetData(), buf.GetDataLen(), &len);
if ( !len && buf.GetDataLen() )
{
wxString line(str.Left(posLineStart));
memText.AddLine(line);
str = str.Mid(posLineStart + EOLLen);
posLineStart = str.Find(pEOL);
wxLogError(_("Failed to read config options."));
}
#else // !wxUSE_UNICODE
// no need for conversion
cbuf = wxCharBuffer::CreateNonOwned((char *)buf.GetData());
#endif // wxUSE_UNICODE/!wxUSE_UNICODE
// also add whatever we have left in the translated string.
if ( !str.empty() )
memText.AddLine(str);
// now break it into lines
wxMemoryText memText;
for ( const wxChar *s = cbuf; ; ++s )
{
const wxChar *e = s;
while ( *e != '\0' && *e != '\n' && *e != '\r' )
++e;
// notice that we throw away the original EOL kind here, maybe we
// should preserve it?
memText.AddLine(wxString(s, e));
if ( *e == '\0' )
break;
// skip the second EOL byte if it's a DOS one
if ( *e == '\r' && e[1] == '\n' )
++e;
s = e;
}
// Finally we can parse it all.
Parse(memText, true /* local */);