141 lines
3.0 KiB
C++
141 lines
3.0 KiB
C++
// zlib input file stream wrapper.
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//
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// Written by Bernie Bright, 1998
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//
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// Copyright (C) 1998 Bernie Bright - bbright@c031.aone.net.au
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License as
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// published by the Free Software Foundation; either version 2 of the
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// License, or (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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//
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// $Id$
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#include <ctype.h> // isspace()
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#include <Misc/fgstream.hxx>
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fg_gzifstream::fg_gzifstream()
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: istream(&gzbuf)
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{
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}
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//-----------------------------------------------------------------------------
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//
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// Open a possibly gzipped file for reading.
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//
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fg_gzifstream::fg_gzifstream( const string& name, ios_openmode io_mode )
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: istream(&gzbuf)
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{
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this->open( name, io_mode );
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}
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//-----------------------------------------------------------------------------
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//
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// Attach a stream to an already opened file descriptor.
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//
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fg_gzifstream::fg_gzifstream( int fd, ios_openmode io_mode )
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: istream(&gzbuf)
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{
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gzbuf.attach( fd, io_mode );
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}
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//-----------------------------------------------------------------------------
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//
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// Open a possibly gzipped file for reading.
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// If the initial open fails and the filename has a ".gz" extension then
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// remove the extension and try again.
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// If the initial open fails and the filename doesn't have a ".gz" extension
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// then append ".gz" and try again.
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//
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void
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fg_gzifstream::open( const string& name, ios_openmode io_mode )
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{
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gzbuf.open( name.c_str(), io_mode );
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if ( ! gzbuf.is_open() )
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{
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string s = name;
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if ( s.substr( s.length() - 3, 3 ) == ".gz" )
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{
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// remove ".gz" suffix
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s.replace( s.length() - 3, 3, "" );
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// s.erase( s.length() - 3, 3 );
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}
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else
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{
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// Append ".gz" suffix
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s += ".gz";
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}
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// Try again.
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gzbuf.open( s.c_str(), io_mode );
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}
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}
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void
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fg_gzifstream::attach( int fd, ios_openmode io_mode )
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{
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gzbuf.attach( fd, io_mode );
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}
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//
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// Manipulators
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//
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istream&
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skipeol( istream& in )
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{
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char c = 0;
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// skip to end of line.
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while ( in.get(c) && (c != '\n' && c != '\r') )
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;
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// \r\n ?
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return in;
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}
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istream&
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skipws( istream& in )
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{
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char c;
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while ( in.get(c) )
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{
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if ( ! isspace( c ) )
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{
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// put pack the non-space character
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in.putback(c);
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break;
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}
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}
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return in;
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}
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istream&
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skipcomment( istream& in )
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{
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while ( in )
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{
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// skip whitespace
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in >> skipws;
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char c;
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if ( in.get( c ) && c != '#' )
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{
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// not a comment
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in.putback(c);
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break;
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}
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in >> skipeol;
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}
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return in;
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}
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