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codecvte.h
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1998-02-09
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/**************************************************************************
*
* codecvte.h - Example of user defined codecvt facet.
* See Class Reference Section
*
* $Id: codecvte.h,v 1.2 1996/09/28 00:06:02 smithey Exp $
*
***************************************************************************
*
* (c) Copyright 1994, 1995 Rogue Wave Software, Inc.
* ALL RIGHTS RESERVED *
* The software and information contained herein are proprietary to, and
* comprise valuable trade secrets of, Rogue Wave Software, Inc., which
* intends to preserve as trade secrets such software and information.
* This software is furnished pursuant to a written license agreement and
* may be used, copied, transmitted, and stored only in accordance with
* the terms of such license and with the inclusion of the above copyright
* notice. This software and information or any other copies thereof may
* not be provided or otherwise made available to any other person.
*
* Notwithstanding any other lease or license that may pertain to, or
* accompany the delivery of, this computer software and information, the
* rights of the Government regarding its use, reproduction and disclosure
* are as set forth in Section 52.227-19 of the FARS Computer
* Software-Restricted Rights clause.
*
* Use, duplication, or disclosure by the Government is subject to
* restrictions as set forth in subparagraph (c)(1)(ii) of the Rights in
* Technical Data and Computer Software clause at DFARS 252.227-7013.
* Contractor/Manufacturer is Rogue Wave Software, Inc.,
* P.O. Box 2328, Corvallis, Oregon 97339.
*
* This computer software and information is distributed with "restricted
* rights." Use, duplication or disclosure is subject to restrictions as
* set forth in NASA FAR SUP 18-52.227-79 (April 1985) "Commercial
* Computer Software-Restricted Rights (April 1985)." If the Clause at
* 18-52.227-74 "Rights in Data General" is specified in the contract,
* then the "Alternate III" clause applies.
*
**************************************************************************/
#include <locale>
#include <strstream>
#include <functional>
#include <algorithm>
#ifndef _RWSTD_NO_NAMESPACE
using namespace std;
#endif
#define RWSTD_TABLE_SIZE 59
//
// This facet performs a conversion from Latin Alphabet No. 1
// (ISO 8859-1) to U.S. ASCII code page 437. Some conversions are one
// way (from ISO to ASCII, but not back again) because this ASCII
// code page has no equivilent to the ISO character.
//
class ex_codecvt : public codecvt<char,char,mbstate_t>
{
private:
static char table_[RWSTD_TABLE_SIZE][3];
protected:
virtual result do_in(mbstate_t&,
const char* from, const char* from_end, const char*& from_next,
char* to, char* to_limit, char*& to_next) const
{
bool match;
int i = min(to_limit-to,from_end-from);
from_next = from;
to_next = to;
for (int j =0; j < i; j++)
{
match = false;
for (int k = 0; k < RWSTD_TABLE_SIZE; k++)
{
if (*from_next >= table_[k][0] &&
*from_next <= table_[k][1])
{
*to_next = table_[k][2];
match = true;
break;
}
}
if (!match)
*to_next = *from_next;
from_next++;
to_next++;
}
return ok;
}
virtual result do_out(mbstate_t&,
const char* from, const char* from_end, const char*& from_next,
char* to, char* to_limit, char*& to_next) const
{
bool match;
int i = min(to_limit-to,from_end-from);
from_next = from;
to_next = to;
for (int j =0; j < i; j++)
{
match = false;
for (int k = 0; k < RWSTD_TABLE_SIZE; k++)
{
if (*from_next == table_[k][2] &&
table_[k][0] == table_[k][1])
{
*to_next = table_[k][1];
match = true;
break;
}
}
if (!match)
*to_next = *from_next;
from_next++;
to_next++;
}
return ok;
}
virtual bool do_always_noconv() const _RWSTD_THROW_SPEC_NULL
{ return false; }
virtual int do_encoding() const _RWSTD_THROW_SPEC_NULL
{ return 1; }
virtual int do_length (const mbstate_t&, const char* from,
const char* end, size_t max) const
{ return min((size_t)(end - from),max); }
virtual int do_max_length() const _RWSTD_THROW_SPEC_NULL
{ return INT_MAX; }
};
char ex_codecvt::table_[RWSTD_TABLE_SIZE][3] =
{ 0xa2, 0xa2, 0x9b,
0xa3, 0xa3, 0x9c,
0xa5, 0xa5, 0x9d,
0xa7, 0xa7, 0x15,
0xa8, 0xa8, 0x22,
0xaa, 0xaa, 0xa6,
0xab, 0xab, 0xae,
0xb5, 0xb5, 0xe6,
0xb6, 0xb6, 0x14,
0xb7, 0xb7, 0xfa,
0xba, 0xba, 0xa7,
0xbb, 0xbb, 0xaf,
0xbc, 0xbc, 0xac,
0xbd, 0xbd, 0xab,
0xbf, 0xbf, 0xa8,
0xc0, 0xc3, 0x41,
0xc4, 0xc4, 0x8e,
0xc5, 0xc5, 0x41,
0xc6, 0xc6, 0x92,
0xc7, 0xc7, 0x80,
0xc8, 0xc8, 0x45,
0xc9, 0xc9, 0x90,
0xca, 0xcb, 0x45,
0xcc, 0xcf, 0x49,
0xd1, 0xd1, 0xa5,
0xd2, 0xd5, 0x4f,
0xd6, 0xd6, 0x99,
0xd8, 0xd8, 0xed,
0xd9, 0xdb, 0x55,
0xdc, 0xdc, 0x9a,
0xdd, 0xdd, 0x59,
0xdf, 0xdf, 0xe1,
0xe0, 0xe0, 0x85,
0xe1, 0xe1, 0xa0,
0xe2, 0xe2, 0x83,
0xe3, 0xe3, 0x61,
0xe4, 0xe4, 0x84,
0xe5, 0xe5, 0x86,
0xe6, 0xe6, 0x91,
0xe7, 0xe7, 0x87,
0xe8, 0xe8, 0x8a,
0xe9, 0xe9, 0x82,
0xea, 0xea, 0x88,
0xeb, 0xeb, 0x89,
0xec, 0xec, 0x8d,
0xed, 0xed, 0xa1,
0xee, 0xee, 0x8c,
0xef, 0xef, 0x8b,
0xf1, 0xf1, 0xa4,
0xf2, 0xf2, 0x95,
0xf3, 0xf3, 0xa2,
0xf4, 0xf4, 0x93,
0xf5, 0xf5, 0x6f,
0xf6, 0xf6, 0x94,
0xf9, 0xf9, 0x97,
0xfa, 0xfa, 0xa3,
0xfb, 0xfb, 0x96,
0xfc, 0xfc, 0x81,
0xff, 0xff, 0x98 };