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//
// Copyright (c) 2009-2011 Artyom Beilis (Tonkikh)
//
// Distributed under the Boost Software License, Version 1.0. (See
// accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
//
#ifndef BOOST_LOCALE_IMPL_ICONV_CODEPAGE_HPP
#define BOOST_LOCALE_IMPL_ICONV_CODEPAGE_HPP
#include <boost/locale/encoding.hpp>
#include "../util/iconv.hpp"
#include <errno.h>
#include "conv.hpp"
#include <assert.h>
#include <vector>
namespace boost {
namespace locale {
namespace conv {
namespace impl {
class iconverter_base {
public:
iconverter_base() :
cvt_((iconv_t)(-1))
{
}
~iconverter_base()
{
close();
}
size_t conv(char const **inbufc,size_t *inchar_left,
char **outbuf,size_t *outchar_left)
{
char **inbuf = const_cast<char **>(inbufc);
return call_iconv(cvt_,inbuf,inchar_left,outbuf,outchar_left);
}
bool do_open(char const *to,char const *from,method_type how)
{
close();
cvt_ = iconv_open(to,from);
how_ = how;
return cvt_ != (iconv_t)(-1);
}
template<typename OutChar,typename InChar>
std::basic_string<OutChar> real_convert(InChar const *ubegin,InChar const *uend)
{
std::basic_string<OutChar> sresult;
sresult.reserve(uend - ubegin);
OutChar result[64];
char *out_start = reinterpret_cast<char *>(&result[0]);
char const *begin = reinterpret_cast<char const *>(ubegin);
char const *end = reinterpret_cast<char const *>(uend);
enum { normal , unshifting , done } state = normal;
while(state!=done) {
size_t in_left = end - begin;
size_t out_left = sizeof(result);
char *out_ptr = out_start;
size_t res = 0;
if(in_left == 0)
state = unshifting;
if(state == normal)
res = conv(&begin,&in_left,&out_ptr,&out_left);
else
res = conv(0,0,&out_ptr,&out_left);
int err = errno;
size_t output_count = (out_ptr - out_start) / sizeof(OutChar);
if(res!=0 && res!=(size_t)(-1)) {
if(how_ == stop) {
throw conversion_error();
}
}
sresult.append(&result[0],output_count);
if(res == (size_t)(-1)) {
if(err == EILSEQ || err == EINVAL) {
if(how_ == stop) {
throw conversion_error();
}
if(begin != end) {
begin+=sizeof(InChar);
if(begin >= end)
break;
}
else {
break;
}
}
else if (err==E2BIG) {
continue;
}
else {
// We should never get there
// but if we do
if(how_ == stop)
throw conversion_error();
else
break;
}
}
if(state == unshifting)
state = done;
}
return sresult;
}
private:
void close()
{
if(cvt_!=(iconv_t)(-1)) {
iconv_close(cvt_);
cvt_ = (iconv_t)(-1);
}
}
iconv_t cvt_;
method_type how_;
};
template<typename CharType>
class iconv_from_utf : public converter_from_utf<CharType>
{
public:
typedef CharType char_type;
virtual bool open(char const *charset,method_type how)
{
return self_.do_open(charset,utf_name<CharType>(),how);
}
virtual std::string convert(char_type const *ubegin,char_type const *uend)
{
return self_.template real_convert<char,char_type>(ubegin,uend);
}
virtual ~iconv_from_utf() {}
private:
iconverter_base self_;
};
class iconv_between: public converter_between
{
public:
virtual bool open(char const *to_charset,char const *from_charset,method_type how)
{
return self_.do_open(to_charset,from_charset,how);
}
virtual std::string convert(char const *begin,char const *end)
{
return self_.real_convert<char,char>(begin,end);
}
virtual ~iconv_between() {}
private:
iconverter_base self_;
};
template<typename CharType>
class iconv_to_utf : public converter_to_utf<CharType>
{
public:
typedef CharType char_type;
typedef std::basic_string<char_type> string_type;
virtual bool open(char const *charset,method_type how)
{
return self_.do_open(utf_name<CharType>(),charset,how);
}
virtual string_type convert(char const *begin,char const *end)
{
return self_.template real_convert<char_type,char>(begin,end);
}
virtual ~iconv_to_utf() {}
private:
iconverter_base self_;
};
} // impl
} // conv
} // locale
} // boost
#endif
// vim: tabstop=4 expandtab shiftwidth=4 softtabstop=4
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