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/*=========================================================================
Program: Visualization Toolkit
Module: vtkUTF8TextCodec.cxx
Copyright (c)
All rights reserved.
See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notice for more information.
=========================================================================*/
/*-------------------------------------------------------------------------
Copyright 2010 Sandia Corporation.
Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
the U.S. Government retains certain rights in this software.
-------------------------------------------------------------------------*/
#include "vtkUTF8TextCodec.h"
#include "vtkObjectFactory.h"
#include "vtkTextCodecFactory.h"
#include <utf8.h>
vtkStandardNewMacro(vtkUTF8TextCodec);
bool vtkUTF8TextCodec::CanHandle(const char* testStr)
{
if (0 == strcmp(testStr, "UTF-8"))
{
return true;
}
else
{
return false;
}
}
namespace
{
// iterator to use in testing validity - throws all input away.
class testIterator : public vtkTextCodec::OutputIterator
{
public:
testIterator& operator++(int) VTK_OVERRIDE {return *this;}
testIterator& operator*() VTK_OVERRIDE {return *this;}
testIterator& operator=(const vtkUnicodeString::value_type) VTK_OVERRIDE
{return *this;}
testIterator() {}
~testIterator() VTK_OVERRIDE {}
private:
testIterator(const testIterator&) VTK_DELETE_FUNCTION;
const testIterator& operator=(const testIterator&) VTK_DELETE_FUNCTION;
};
} // end anonymous namespace
bool vtkUTF8TextCodec::IsValid(istream& InputStream)
{
bool returnBool = true;
// get the position of the stream so we can restore it when we are done
istream::pos_type StreamPos = InputStream.tellg();
try
{
testIterator junk;
this->ToUnicode(InputStream, junk);
}
catch(...)
{
returnBool = false;
}
// reset the stream
InputStream.clear();
InputStream.seekg(StreamPos);
return returnBool;
}
void vtkUTF8TextCodec::ToUnicode(istream& InputStream,
vtkTextCodec::OutputIterator& Output)
{
try
{
while (!InputStream.eof())
{
vtkUnicodeString::value_type CodePoint = this->NextUnicode(InputStream);
*Output++ = CodePoint;
}
}
catch (std::string& ef)
{
if (ef == "End of Input")
{
return; // we just completed the sequence...
}
else
{
throw;
}
}
}
vtkUnicodeString::value_type vtkUTF8TextCodec::NextUnicode(istream& InputStream)
{
istream::char_type c[5];
c[4] = '\0';
unsigned int getSize = 0;
c[getSize] = InputStream.get();
if (InputStream.fail())
{
throw(std::string("End of Input"));
}
getSize = utf8::internal::sequence_length(c);
if (0 == getSize)
throw(std::string("Not enough space"));
for (unsigned int i = 1; i < getSize; ++i)
{
c[i] = InputStream.get();
if (InputStream.fail())
throw(std::string("Not enough space"));
}
istream::char_type* c1 = c;
const vtkTypeUInt32 code_point = utf8::next(c1, &c[getSize]);
return code_point;
}
vtkUTF8TextCodec::vtkUTF8TextCodec() : vtkTextCodec()
{
}
vtkUTF8TextCodec::~vtkUTF8TextCodec()
{
}
void vtkUTF8TextCodec::PrintSelf(ostream& os, vtkIndent indent)
{
os << indent << "vtkUTF8TextCodec (" << this << ") \n";
indent = indent.GetNextIndent();
this->Superclass::PrintSelf(os, indent.GetNextIndent());
}
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