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// Copyright (C) 2003, 2009 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING3. If not see
// <http://www.gnu.org/licenses/>.
// 27.8.1.4 Overridden virtual functions
#include <fstream>
#include <locale>
#include <cstdio>
#include <testsuite_hooks.h>
template <typename InternT, typename StateT = mbstate_t>
class checksumcvt : public std::codecvt<InternT, char, StateT>
{
typedef std::codecvt<InternT, char, StateT> Base;
static const size_t width = sizeof(InternT) + 1;
public:
typedef InternT intern_type;
typedef char extern_type;
explicit checksumcvt(size_t refs = 0)
: Base(refs)
{ }
protected:
virtual typename std::codecvt<InternT, char, StateT>::result
do_out(StateT&, const intern_type* from,
const intern_type* from_end, const intern_type*& from_next,
extern_type* to, extern_type* to_end,
extern_type*& to_next) const
{
size_t len = std::min(static_cast<size_t>(from_end - from),
static_cast<size_t>(to_end - to) / width);
while (len--)
{
const char* p = reinterpret_cast<const char*>(from);
unsigned char checksum = 0;
for (size_t i = 0; i < sizeof(intern_type); ++i)
{
*to++ = p[i];
checksum ^= static_cast<unsigned char>(p[i]);
}
*to++ = checksum;
++from;
}
from_next = from;
to_next = to;
return from_next == from_end ? std::codecvt<InternT, char, StateT>::ok
: std::codecvt<InternT, char, StateT>::partial;
}
virtual typename std::codecvt<InternT, char, StateT>::result
do_unshift(StateT&, extern_type* to,
extern_type*, extern_type*& to_next) const
{
to_next = to;
return std::codecvt<InternT, char, StateT>::ok;
}
virtual typename std::codecvt<InternT, char, StateT>::result
do_in(StateT&, const extern_type* from,
const extern_type* from_end, const extern_type*& from_next,
intern_type* to, intern_type* to_end,
intern_type*& to_next) const
{
size_t len = std::min(static_cast<size_t>(to_end - to),
static_cast<size_t>(from_end - from) / width);
while (len)
{
const char* f = from;
intern_type tmp;
char* p = reinterpret_cast<char*>(&tmp);
unsigned char checksum = 0;
for (size_t i = 0; i < sizeof(intern_type); ++i)
{
p[i] = *f;
checksum ^= static_cast<unsigned char>(*f++);
}
if (*f++ != checksum)
break;
from = f;
*to++ = tmp;
len--;
}
from_next = from;
to_next = to;
return len ? std::codecvt<InternT, char, StateT>::error :
(from_next == from_end ? std::codecvt<InternT, char, StateT>::ok
: std::codecvt<InternT, char, StateT>::partial);
}
virtual int
do_encoding() const throw()
{ return width; }
virtual int
do_length(StateT&, const extern_type* from,
const extern_type* end, size_t max) const
{
size_t len = std::min(max, static_cast<size_t>(end - from) / width);
int ret = 0;
while (len--)
{
unsigned char checksum = 0;
for (size_t i = 0; i < sizeof(intern_type); ++i)
{
checksum ^= static_cast<unsigned char>(*from++);
}
if (*from++ != checksum)
break;
ret++;
}
return ret;
}
virtual int
do_max_length() const throw()
{ return width; }
virtual bool
do_always_noconv() const throw()
{ return false; }
};
// libstdc++/11544 (invalid byte sequence in file)
void test02()
{
using namespace std;
bool test __attribute__((unused)) = true;
locale loc(locale::classic(), new checksumcvt<wchar_t>);
const char* name = "tmp_11544-2";
FILE* f = fopen(name, "w");
fwrite("aaaab", 1, 5, f);
fclose(f);
wifstream in;
in.imbue(loc);
in.open(name);
VERIFY( in.good() );
in.get();
VERIFY( !in.good() );
VERIFY( in.bad() );
VERIFY( !in.eof() );
in.close();
}
int main()
{
test02();
return 0;
}
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