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/*------------------------------------------------------------------------
* Copyright 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 _DATABAR_H_
#define _DATABAR_H_
#define DATABAR_MAX_SEGMENTS 32
/* active DataBar (partial) segment entry */
typedef struct databar_segment_s {
signed finder : 5; /* finder pattern */
unsigned exp : 1; /* DataBar expanded finder */
unsigned color : 1; /* finder coloring */
unsigned side : 1; /* data character side of finder */
unsigned partial : 1; /* unpaired partial segment */
unsigned count : 7; /* times encountered */
unsigned epoch : 8; /* age, in characters scanned */
unsigned check : 8; /* bar checksum */
signed short data; /* decoded character data */
unsigned short width; /* measured width of finder (14 modules) */
} databar_segment_t;
/* DataBar specific decode state */
typedef struct databar_decoder_s {
unsigned config; /* decoder configuration flags */
unsigned config_exp;
unsigned csegs : 8; /* allocated segments */
unsigned epoch : 8; /* current scan */
databar_segment_t *segs; /* active segment list */
signed char chars[16]; /* outstanding character indices */
} databar_decoder_t;
/* reset DataBar segment decode state */
static inline void databar_new_scan(databar_decoder_t *db)
{
int i;
for (i = 0; i < 16; i++)
if (db->chars[i] >= 0) {
databar_segment_t *seg = db->segs + db->chars[i];
if (seg->partial)
seg->finder = -1;
db->chars[i] = -1;
}
}
/* reset DataBar accumulated segments */
static inline void databar_reset(databar_decoder_t *db)
{
int i, n = db->csegs;
databar_new_scan(db);
for (i = 0; i < n; i++)
db->segs[i].finder = -1;
}
/* decode DataBar symbols */
zbar_symbol_type_t _zbar_decode_databar(zbar_decoder_t *dcode);
#endif
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