rot13plugin.cpp

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// This file is part of Ambulant Player, www.ambulantplayer.org.
//
// Copyright (C) 2003-2007 Stichting CWI, 
// Kruislaan 413, 1098 SJ Amsterdam, The Netherlands.
//
// Ambulant Player is free software; you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation; either version 2.1 of the License, or
// (at your option) any later version.
//
// Ambulant Player 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 Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with Ambulant Player; if not, write to the Free Software
// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

#include "ambulant/version.h"
#include "ambulant/common/plugin_engine.h"
#include "ambulant/lib/logger.h"
#include "ambulant/net/datasource.h"

//#define AM_DBG
#ifndef AM_DBG
#define AM_DBG if(0)
#endif
using namespace ambulant;

class rot13_filter_finder : public net::raw_filter_finder {
  public:

    net::datasource* new_raw_filter(const net::url& url, net::datasource *src);	
};

class rot13_datasource : public net::filter_datasource_impl 
{
  public:
    rot13_datasource(net::datasource *src)
    :   net::filter_datasource_impl(src) {}
    
	size_t _process(char *data, size_t size);
};

net::datasource *
rot13_filter_finder::new_raw_filter(const net::url& url, net::datasource *src)
{
    std::string path = url.get_path();
	size_t dotpos = path.find_last_of(".");
	if (dotpos <= 0) return src;
	std::string ext = path.substr(dotpos);
    if (ext == ".rot13" && dynamic_cast<rot13_datasource*>(src) == NULL) {
        AM_DBG lib::logger::get_logger()->debug("rot13_filter_finder: success for 0x%x, basetype is %s", src, typeid(src).name());
        return new rot13_datasource(src);
    }
    return src;
}

size_t
rot13_datasource::_process(char *data, size_t size)
{
	char *optr = m_databuf.get_write_ptr(size);
	size_t i;
	for(i=0; i<size; i++) {
    	char c = data[i];
    	if (c >= 'a' && c <= 'z') {
            c += 13;
            if (c > 'z') c -= 26;
    	}
    	if (c >= 'A' && c <= 'Z') {
            c += 13;
            if (c > 'Z') c -= 26;
    	}
    	optr[i] = c;
    }
	m_databuf.pushdata(size);
	return size;
}

static ambulant::common::factories * 
bug_workaround(ambulant::common::factories* factory)
{
	return factory;
}

extern "C"
#ifdef AMBULANT_PLATFORM_WIN32
__declspec(dllexport)
#endif
void initialize(
    int api_version,
    ambulant::common::factories* factory,
    ambulant::common::gui_player *player)
{
    if ( api_version != AMBULANT_PLUGIN_API_VERSION ) {
        lib::logger::get_logger()->warn("rot13_plugin: built for plugin-api version %d, current %d. Skipping.", 
            AMBULANT_PLUGIN_API_VERSION, api_version);
        return;
    }
    if ( !ambulant::check_version() )
        lib::logger::get_logger()->warn("rot13_plugin: built for different Ambulant version (%s)", AMBULANT_VERSION);
	factory = bug_workaround(factory);
    AM_DBG lib::logger::get_logger()->debug("rot13_plugin: loaded.");
    net::datasource_factory *df = factory->get_datasource_factory();
    if (df) {
    	rot13_filter_finder *ff = new rot13_filter_finder();
    	df->add_raw_filter(ff);
    	AM_DBG lib::logger::get_logger()->trace("rot13_plugin: registered");
    }
}