Jim Evins
375 lines
8.6 KiB
C++
375 lines
8.6 KiB
C++
/* GnuBarcode.cpp
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*
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* Copyright (C) 2017 Jim Evins <evins@snaught.com>
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*
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* This file is part of gLabels-qt.
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*
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* gLabels-qt is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* gLabels-qt is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU 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 gLabels-qt. If not, see <http://www.gnu.org/licenses/>.
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*/
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#if HAVE_GNU_BARCODE
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#include "GnuBarcode.h"
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#include <QtDebug>
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#include <barcode.h>
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#include <cctype>
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namespace
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{
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const double INK_BLEED = 0.1; /* Shrink bars to account for ink bleed. */
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const double FONT_SCALE = 0.75; /* Shrink font slightly, otherwise too crowded. */
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}
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namespace glabels
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{
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namespace GnuBarcode
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{
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bool Base::isAscii( const std::string& data ) const
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{
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for ( unsigned int i = 0; i < data.size(); i++ )
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{
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if ( (data[i] & 0x80) != 0 )
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{
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return false;
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}
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}
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return true;
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}
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bool Base::isNumericLengthValid( const std::string& data,
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unsigned int nMin,
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unsigned int nMax ) const
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{
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unsigned int n = 0;
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for ( unsigned int i = 0; i < data.size(); i++ )
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{
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if ( (data[i] & 0x80) == 0 )
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{
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n++;
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}
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else
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{
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return false;
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}
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}
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return (n >= nMin) && (n <= nMax);
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}
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bool Base::isNumericLength1Valid( const std::string& data,
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unsigned int nMin,
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unsigned int nMax ) const
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{
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unsigned int n = 0;
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for ( unsigned int i = 0; !isspace(data[i]) && (i < data.size()); i++ )
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{
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if ( isdigit(data[i]) )
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{
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n++;
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}
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else if ( !isspace(data[i]) )
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{
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return false;
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}
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}
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return (n >= nMin) && (n <= nMax);
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}
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bool Base::isNumericLength2Valid( const std::string& data,
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unsigned int nMin,
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unsigned int nMax ) const
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{
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unsigned int i;
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unsigned int n = 0;
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for ( i = 0; !isspace(data[i]) && (i < data.size()); i++ )
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{
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/* Skip over 1st string */
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}
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for ( i++ /* skip space */ ; i < data.size(); i++ )
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{
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if ( isdigit(data[i]) )
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{
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n++;
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}
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else
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{
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return false;
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}
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}
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return (n >= nMin) && (n <= nMax);
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}
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void Base::vectorize( const std::string& encodedData,
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const std::string& displayText,
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const std::string& cookedData,
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double& w,
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double& h )
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{
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/*
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* First encode using GNU Barcode library.
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*/
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Barcode_Item* bci = Barcode_Create( (char*)cookedData.c_str() );
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bci->scalef = 0;
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bci->width = (int)w;
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bci->height = (int)h;
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bci->flags = flags;
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if ( !showText() )
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{
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bci->flags |= BARCODE_NO_ASCII;
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}
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if ( !checksum() )
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{
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bci->flags |= BARCODE_NO_CHECKSUM;
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}
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Barcode_Encode( bci, flags );
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if ( (bci->partial == nullptr) || (bci->textinfo == nullptr) )
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{
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Barcode_Delete( bci );
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setIsDataValid( false );
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return;
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}
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/*
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* Now do the actual vectorization.
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*
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* This code is based on the postscript renderer (ps.c) from the GNU barcode library:
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*
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* Copyright (C) 1999 Alessaandro Rubini (rubini@gnu.org)
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* Copyright (C) 1999 Prosa Srl. (prosa@prosa.it)
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*/
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if (bci->width > (2*bci->margin))
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{
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bci->width -= 2*bci->margin;
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}
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if (bci->height > (2*bci->margin))
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{
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bci->height -= 2*bci->margin;
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}
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/* First calculate barlen */
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int barlen = bci->partial[0] - '0';
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for ( int i = 1; bci->partial[i] != 0; i++ )
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{
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if ( isdigit(bci->partial[i]) )
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{
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barlen += bci->partial[i] - '0';
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}
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else
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{
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if ( (bci->partial[i] != '+') && (bci->partial[i] != '-') )
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{
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barlen += bci->partial[i] - 'a' + 1;
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}
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}
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}
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/* The scale factor depends on bar length */
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double scalef = 1;
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if ( bci->scalef == 0 )
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{
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if ( bci->width == 0 )
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{
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bci->width = barlen; /* default */
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}
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scalef = bci->scalef = (double)bci->width / (double)barlen;
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if ( scalef < 0.5 )
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{
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scalef = 0.5;
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}
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}
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/* The width defaults to "just enough" */
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bci->width = (int)( barlen * scalef + 1 );
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/* But it can be too small, in this case enlarge and center the area */
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if ( bci->width < (int)(barlen * scalef) )
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{
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int wid = (int)( barlen * scalef + 1);
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bci->xoff -= (wid - bci->width)/2 ;
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bci->width = wid;
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/* Can't extend too far on the left */
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if (bci->xoff < 0)
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{
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bci->width += -bci->xoff;
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bci->xoff = 0;
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}
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}
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/* The height defaults to 80 points (rescaled) */
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if ( bci->height == 0 )
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{
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bci->height = (int)( 80 * scalef );
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}
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/* If too small (5 + text), reduce the scale factor and center */
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int i = 5 + 10 * ( ((bci->flags & BARCODE_NO_ASCII)==0) ? 1 : 0 );
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if ( bci->height < (int)(i * scalef) )
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{
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bci->height = (int)( i * scalef );
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}
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/* Now traverse the code string and create a list of lines */
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char mode = '-'; /* text below bars */
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double x = bci->margin + (bci->partial[0] - '0') * scalef;
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i = 1;
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for ( int ip = 1; bci->partial[ip] != 0; ip++, i++)
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{
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/* special cases: '+' and '-' */
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if ( bci->partial[ip] == '+' || bci->partial[ip] == '-' )
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{
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mode = bci->partial[ip]; /* don't count it */
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i++;
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continue;
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}
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/* j is the width of this bar/space */
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int j;
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if ( isdigit(bci->partial[ip]) )
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{
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j = bci->partial[ip] - '0';
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}
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else
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{
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j = bci->partial[ip] - 'a' + 1;
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}
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if ( (i % 2) != 0 )
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{
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/* bar */
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double x0 = x;
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double y0 = bci->margin;
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double yr = bci->height;
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if ( (bci->flags & BARCODE_NO_ASCII) == 0 )
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{
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/* leave space for text */
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if (mode == '-')
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{
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/* text below bars: 10 or 5 points */
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yr -= (isdigit(bci->partial[ip]) ? 10 : 5) * scalef;
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}
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else
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{
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/* '+' */
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/* above bars: 10 or 0 from bottom,
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and 10 from top */
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y0 += 10 * scalef;
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yr -= (isdigit(bci->partial[ip]) ? 20 : 10) * scalef;
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}
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}
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addBox( x0, y0, (j * scalef) - INK_BLEED, yr );
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}
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x += j * scalef;
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}
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/* Now the text */
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mode = '-'; /* reinstantiate default */
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if ( (bci->flags & BARCODE_NO_ASCII) == 0 )
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{
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int len = strlen( bci->textinfo );
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for ( int i = 0; i < len; i++ )
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{
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if ( bci->textinfo[i] == ' ' )
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{
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continue;
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}
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if ( (bci->textinfo[i] == '+') || (bci->textinfo[i] == '-') )
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{
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mode = bci->textinfo[i];
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continue;
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}
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double f1, f2;
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char c;
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if ( sscanf( &bci->textinfo[i], "%lf:%lf:%c", &f1, &f2, &c) != 3 )
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{
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qDebug() << "Impossible data:" << QString(&bci->textinfo[i]);
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continue;
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}
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f2 *= FONT_SCALE;
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double x0 = f1*scalef + bci->margin + 0.4*f2*scalef;
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double y0;
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if (mode == '-')
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{
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y0 = bci->margin + bci->height - 8*scalef + 0.75*f2*scalef;
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}
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else
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{
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y0 = bci->margin + 0.75*f2*scalef;
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}
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addText( x0, y0, f2*scalef, QString(c).toStdString() );
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/* skip past the substring we just read. */
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while ( (bci->textinfo[i] != ' ') && (bci->textinfo[i] != 0) )
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{
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i++;
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}
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}
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}
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/* Fill in other info */
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w = bci->width + 2.0*bci->margin;
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h = bci->height + 2.0*bci->margin;
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/* Cleanup */
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Barcode_Delete( bci );
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}
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glbarcode::Barcode* Ean::create()
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{
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return new Ean();
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}
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bool Ean::validate( const std::string& rawData )
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{
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return ( isNumericLengthValid( rawData, 7, 8 )
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|| isNumericLengthValid( rawData, 12, 13 )
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|| ( isNumericLength1Valid( rawData, 7, 8 ) && isNumericLength2Valid( rawData, 2, 2 ) )
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|| ( isNumericLength1Valid( rawData, 7, 8 ) && isNumericLength2Valid( rawData, 5, 5 ) )
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|| ( isNumericLength1Valid( rawData, 12, 13 ) && isNumericLength2Valid( rawData, 2, 2 ) )
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|| ( isNumericLength1Valid( rawData, 12, 13 ) && isNumericLength2Valid( rawData, 5, 5 ) ) );
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}
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std::string Ean::encode( const std::string& cookedData )
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{
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flags = BARCODE_EAN;
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return ""; // Actual encoding is done in vectorize
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}
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}
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}
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#endif // HAVE_GNU_BARCODE
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