kolibrios/contrib/media/updf/include/bits/basic_file.h
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git-svn-id: svn://kolibrios.org@4680 a494cfbc-eb01-0410-851d-a64ba20cac60
2014-03-22 21:00:40 +00:00

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C++

// Wrapper of C-language FILE struct -*- C++ -*-
// Copyright (C) 1999, 2000, 2001 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 2, 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 COPYING. If not, write to the Free
// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
// USA.
// As a special exception, you may use this file as part of a free software
// library without restriction. Specifically, if other files instantiate
// templates or use macros or inline functions from this file, or you compile
// this file and link it with other files to produce an executable, this
// file does not by itself cause the resulting executable to be covered by
// the GNU General Public License. This exception does not however
// invalidate any other reasons why the executable file might be covered by
// the GNU General Public License.
//
// ISO C++ 14882: 27.8 File-based streams
//
#ifndef _CPP_BASIC_FILE
#define _CPP_BASIC_FILE 1
#pragma GCC system_header
#include <bits/c++config.h>
#include <bits/std_ios.h>
namespace std
{
// Ulrich is going to make some detailed comment here, explaining
// all this unpleasantness, providing detailed performance analysis
// as to why we have to do all this lame vtable hacking instead of a
// sane, function-based approach. This verbiage will provide a clear
// and detailed description of the whole object-layout,
// vtable-swapping, sordid history of this hack.
template<typename _CharT>
struct __basic_file_base: public __c_file_type
{
virtual
~__basic_file_base() { };
virtual int
overflow(int __c = EOF) = 0;
virtual int
underflow() = 0;
virtual int
uflow() = 0;
virtual int
pbackfail(int __c) = 0;
virtual streamsize
xsputn(const _CharT* __s, streamsize __n) = 0;
virtual streamsize
xsgetn(_CharT* __s, streamsize __n) = 0;
virtual streamoff
seekoff(streamoff __off, ios_base::seekdir __way,
ios_base::openmode __mode = ios_base::in | ios_base::out) = 0;
virtual streamoff
seekpos(streamoff __pos,
ios_base::openmode __mode = ios_base::in | ios_base::out) = 0;
virtual streambuf*
setbuf(_CharT* __b, int __len) = 0;
virtual int
sync() = 0;
virtual int
doallocate() = 0;
virtual streamsize
sys_read(_CharT* __s, streamsize __n) = 0;
virtual streamsize
sys_write(const _CharT* __s, streamsize __n) = 0;
virtual streamoff
sys_seek(streamoff __off, ios_base::seekdir __way) = 0;
virtual int
sys_close() = 0;
virtual int
sys_stat(void* __v) = 0;
virtual int
showmanyc() = 0;
virtual void
imbue(void* __v) = 0;
};
// Some of these member functions are based on libio/filebuf.cc.
// Also note that the order and number of virtual functions has to precisely
// match the order and number in the _IO_jump_t struct defined in libioP.h.
template<typename _CharT>
#ifdef _GLIBCPP_BASIC_FILE_INHERITANCE
class __basic_file: public __basic_file_base<_CharT>
#else
class __basic_file
#endif
{
#if _GLIBCPP_BASIC_FILE_ENCAPSULATION
__c_file_type* _M_cfile;
bool _M_cfile_created;
#else
# ifdef _GLIBCPP_USE_WCHAR_T
__c_wfile_type _M_wfile;
# endif
#endif
public:
__basic_file(__c_lock* __lock = 0);
void
_M_open_mode(ios_base::openmode __mode, int& __p_mode, int& __rw_mode,
char* __c_mode);
// Equivalent to the normal fopen function.
__basic_file*
open(const char* __name, ios_base::openmode __mode, int __prot = 0664);
// Used for opening the standard streams, cin, cout, cerr, clog,
// and their wide-stream equivalents. Instead of calling open, it
// just sets __c_file_type->_fileno and the respective _flags bits, and
// returns.
__basic_file*
sys_open(__c_file_type* __file, ios_base::openmode __mode);
_CharT
sys_getc();
_CharT
sys_ungetc(_CharT);
__basic_file*
close();
bool
is_open();
// NB: Must match FILE specific jump table starting here--this
// means all virtual functions starting with the dtor must match,
// slot by slot. For glibc-based dystems, this means the _IO_FILE
// as the FILE struct and _IO_jump_t as the jump table.
virtual
~__basic_file(); // Takes the place of __finish.
virtual int
overflow(int __c = EOF);
virtual int
underflow();
virtual int
uflow();
virtual int
pbackfail(int __c);
// A complex "write" function that sets all of __c_file_type's
// pointers and associated data members correctly and manages its
// relation to the external byte sequence.
virtual streamsize
xsputn(const _CharT* __s, streamsize __n);
// A complex "read" function that sets all of __c_file_type's
// pointers and associated data members correctly and manages its
// relation to the external byte sequence.
virtual streamsize
xsgetn(_CharT* __s, streamsize __n);
// A complex "seekoff" function that sets all of __c_file_type's
// pointers and associated data members correctly and manages its
// relation to the external byte sequence.
virtual streamoff
seekoff(streamoff __off, ios_base::seekdir __way,
ios_base::openmode __mode = ios_base::in | ios_base::out);
// A complex "seekpos" function that sets all of __c_file_type's
// pointers and associated data members correctly and manages its
// relation to the external byte sequence.
virtual streamoff
seekpos(streamoff __pos,
ios_base::openmode __mode = ios_base::in | ios_base::out);
virtual streambuf*
setbuf(_CharT* __b, int __len);
virtual int
sync();
virtual int
doallocate();
// A simple read function for the external byte sequence, that
// does no mucking around with or setting of the pointers or flags
// in __c_file_type.
virtual streamsize
sys_read(_CharT* __s, streamsize __n);
// A simple write function for the external byte sequence, that
// does no mucking around with or setting of the pointers or flags
// in __c_file_type.
virtual streamsize
sys_write(const _CharT* __s, streamsize __n);
// A simple seek function for the external byte sequence, that
// does no mucking around with or setting of the pointers or flags
// in __c_file_type.
virtual streamoff
sys_seek(streamoff __off, ios_base::seekdir __way);
virtual int
sys_close();
virtual int
sys_stat(void* __v);
virtual int
showmanyc();
virtual void
imbue(void* __v);
};
} // namespace std
// Now include the bits that are dependant on the underlying I/O
// model chosen at configure time.
#include <bits/basic_file_model.h>
#endif // _CPP_BASIC_FILE