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//------------------------------------------------------------------------
// Copyright 2007-2010 (c) Jeff Brown <spadix@users.sourceforge.net>
//
// This file is part of the ZBar Bar Code Reader.
//
// The ZBar Bar Code Reader is free software; you can redistribute it
// and/or modify it under the terms of the GNU Lesser Public License as
// published by the Free Software Foundation; either version 2.1 of
// the License, or (at your option) any later version.
//
// The ZBar Bar Code Reader 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 Public License for more details.
//
// You should have received a copy of the GNU Lesser Public License
// along with the ZBar Bar Code Reader; if not, write to the Free
// Software Foundation, Inc., 51 Franklin St, Fifth Floor,
// Boston, MA 02110-1301 USA
//
// http://sourceforge.net/projects/zbar
//------------------------------------------------------------------------
#ifndef _ZBAR_DECODER_H_
#define _ZBAR_DECODER_H_
/// @file
/// Decoder C++ wrapper
#ifndef _ZBAR_H_
#error "include zbar.h in your application, **not** zbar/Decoder.h"
#endif
#include <string>
namespace zbar
{
/// low-level bar width stream decoder interface.
/// identifies symbols and extracts encoded data
class Decoder
{
public:
/// Decoder result handler.
/// applications should subtype this and pass an instance to
/// set_handler() to implement result processing
class Handler
{
public:
virtual ~Handler()
{
}
/// invoked by the Decoder as decode results become available.
virtual void decode_callback(Decoder &decoder) = 0;
};
/// constructor.
Decoder() : _handler(NULL)
{
_decoder = zbar_decoder_create();
}
~Decoder()
{
zbar_decoder_destroy(_decoder);
}
/// clear all decoder state.
/// see zbar_decoder_reset()
void reset()
{
zbar_decoder_reset(_decoder);
}
/// mark start of a new scan pass.
/// see zbar_decoder_new_scan()
void new_scan()
{
zbar_decoder_new_scan(_decoder);
}
/// process next bar/space width from input stream.
/// see zbar_decode_width()
zbar_symbol_type_t decode_width(unsigned width)
{
return (zbar_decode_width(_decoder, width));
}
/// process next bar/space width from input stream.
/// see zbar_decode_width()
Decoder &operator<<(unsigned width)
{
zbar_decode_width(_decoder, width);
return (*this);
}
/// retrieve color of @em next element passed to Decoder.
/// see zbar_decoder_get_color()
zbar_color_t get_color() const
{
return (zbar_decoder_get_color(_decoder));
}
/// retrieve last decoded symbol type.
/// see zbar_decoder_get_type()
zbar_symbol_type_t get_type() const
{
return (zbar_decoder_get_type(_decoder));
}
/// retrieve string name of last decoded symbol type.
/// see zbar_get_symbol_name()
const char *get_symbol_name() const
{
return (zbar_get_symbol_name(zbar_decoder_get_type(_decoder)));
}
/// retrieve string name for last decode addon.
/// see zbar_get_addon_name()
/// @deprecated in 0.11
const char *get_addon_name() const
{
return (zbar_get_addon_name(zbar_decoder_get_type(_decoder)));
}
/// retrieve last decoded data in ASCII format as a char array.
/// see zbar_decoder_get_data()
const char *get_data_chars() const
{
return (zbar_decoder_get_data(_decoder));
}
/// retrieve last decoded data as a std::string.
/// see zbar_decoder_get_data()
const std::string get_data_string() const
{
return (std::string(zbar_decoder_get_data(_decoder),
zbar_decoder_get_data_length(_decoder)));
}
/// retrieve last decoded data as a std::string.
/// see zbar_decoder_get_data()
const std::string get_data() const
{
return (get_data_string());
}
/// retrieve length of decoded binary data.
/// see zbar_decoder_get_data_length()
int get_data_length() const
{
return (zbar_decoder_get_data_length(_decoder));
}
/// retrieve last decode direction.
/// see zbar_decoder_get_direction()
/// @since 0.11
int get_direction() const
{
return (zbar_decoder_get_direction(_decoder));
}
/// setup callback to handle result data.
void set_handler(Handler &handler)
{
_handler = &handler;
zbar_decoder_set_handler(_decoder, _cb);
zbar_decoder_set_userdata(_decoder, this);
}
/// set config for indicated symbology (0 for all) to specified value.
/// @see zbar_decoder_set_config()
/// @since 0.4
int set_config(zbar_symbol_type_t symbology, zbar_config_t config,
int value)
{
return (zbar_decoder_set_config(_decoder, symbology, config, value));
}
/// set config parsed from configuration string.
/// @see zbar_decoder_parse_config()
/// @since 0.4
int set_config(std::string cfgstr)
{
return (zbar_decoder_parse_config(_decoder, cfgstr.c_str()));
}
private:
friend class Scanner;
zbar_decoder_t *_decoder;
Handler *_handler;
static void _cb(zbar_decoder_t *cdcode)
{
Decoder *dcode = (Decoder *)zbar_decoder_get_userdata(cdcode);
if (dcode && dcode->_handler)
dcode->_handler->decode_callback(*dcode);
}
};
} // namespace zbar
#endif
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