81 lines
2.9 KiB
C
81 lines
2.9 KiB
C
/*------------------------------------------------------------------------
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* Copyright 2010 (c) Jeff Brown <spadix@users.sourceforge.net>
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*
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* This file is part of the ZBar Bar Code Reader.
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*
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* The ZBar Bar Code Reader is free software; you can redistribute it
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* and/or modify it under the terms of the GNU Lesser Public License as
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* published by the Free Software Foundation; either version 2.1 of
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* the License, or (at your option) any later version.
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*
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* The ZBar Bar Code Reader is distributed in the hope that it will be
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* useful, but WITHOUT ANY WARRANTY; without even the implied warranty
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* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser Public License for more details.
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*
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* You should have received a copy of the GNU Lesser Public License
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* along with the ZBar Bar Code Reader; if not, write to the Free
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* Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301 USA
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*
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* http://sourceforge.net/projects/zbar
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*------------------------------------------------------------------------*/
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#ifndef _DATABAR_H_
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#define _DATABAR_H_
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#define DATABAR_MAX_SEGMENTS 32
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/* active DataBar (partial) segment entry */
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typedef struct databar_segment_s {
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signed finder : 5; /* finder pattern */
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unsigned exp : 1; /* DataBar expanded finder */
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unsigned color : 1; /* finder coloring */
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unsigned side : 1; /* data character side of finder */
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unsigned partial : 1; /* unpaired partial segment */
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unsigned count : 7; /* times encountered */
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unsigned epoch : 8; /* age, in characters scanned */
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unsigned check : 8; /* bar checksum */
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signed short data; /* decoded character data */
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unsigned short width; /* measured width of finder (14 modules) */
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} databar_segment_t;
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/* DataBar specific decode state */
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typedef struct databar_decoder_s {
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unsigned config; /* decoder configuration flags */
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unsigned config_exp;
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unsigned csegs : 8; /* allocated segments */
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unsigned epoch : 8; /* current scan */
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databar_segment_t *segs; /* active segment list */
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signed char chars[16]; /* outstanding character indices */
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} databar_decoder_t;
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/* reset DataBar segment decode state */
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static inline void databar_new_scan (databar_decoder_t *db)
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{
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int i;
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for(i = 0; i < 16; i++)
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if(db->chars[i] >= 0) {
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databar_segment_t *seg = db->segs + db->chars[i];
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if(seg->partial)
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seg->finder = -1;
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db->chars[i] = -1;
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}
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}
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/* reset DataBar accumulated segments */
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static inline void databar_reset (databar_decoder_t *db)
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{
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int i, n = db->csegs;
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databar_new_scan(db);
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for(i = 0; i < n; i++)
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db->segs[i].finder = -1;
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}
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/* decode DataBar symbols */
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zbar_symbol_type_t _zbar_decode_databar(zbar_decoder_t *dcode);
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#endif
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