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<?php
/*
* PHP QR Code encoder
*
* Bitstream class
*
* Based on libqrencode C library distributed under LGPL 2.1
* Copyright (C) 2006, 2007, 2008, 2009 Kentaro Fukuchi <fukuchi@megaui.net>
*
* PHP QR Code is distributed under LGPL 3
* Copyright (C) 2010 Dominik Dzienia <deltalab at poczta dot fm>
*
* This library 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 3 of the License, or any later version.
*
* This library 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 this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
class QRbitstream {
public $data = array();
//----------------------------------------------------------------------
public function size()
{
return count($this->data);
}
//----------------------------------------------------------------------
public function allocate($setLength)
{
$this->data = array_fill(0, $setLength, 0);
return 0;
}
//----------------------------------------------------------------------
public static function newFromNum($bits, $num)
{
$bstream = new QRbitstream();
$bstream->allocate($bits);
$mask = 1 << ($bits - 1);
for($i=0; $i<$bits; $i++) {
if($num & $mask) {
$bstream->data[$i] = 1;
} else {
$bstream->data[$i] = 0;
}
$mask = $mask >> 1;
}
return $bstream;
}
//----------------------------------------------------------------------
public static function newFromBytes($size, $data)
{
$bstream = new QRbitstream();
$bstream->allocate($size * 8);
$p=0;
for($i=0; $i<$size; $i++) {
$mask = 0x80;
for($j=0; $j<8; $j++) {
if($data[$i] & $mask) {
$bstream->data[$p] = 1;
} else {
$bstream->data[$p] = 0;
}
$p++;
$mask = $mask >> 1;
}
}
return $bstream;
}
//----------------------------------------------------------------------
public function append(QRbitstream $arg)
{
if (is_null($arg)) {
return -1;
}
if($arg->size() == 0) {
return 0;
}
if($this->size() == 0) {
$this->data = $arg->data;
return 0;
}
$this->data = array_values(array_merge($this->data, $arg->data));
return 0;
}
//----------------------------------------------------------------------
public function appendNum($bits, $num)
{
if ($bits == 0)
return 0;
$b = QRbitstream::newFromNum($bits, $num);
if(is_null($b))
return -1;
$ret = $this->append($b);
unset($b);
return $ret;
}
//----------------------------------------------------------------------
public function appendBytes($size, $data)
{
if ($size == 0)
return 0;
$b = QRbitstream::newFromBytes($size, $data);
if(is_null($b))
return -1;
$ret = $this->append($b);
unset($b);
return $ret;
}
//----------------------------------------------------------------------
public function toByte()
{
$size = $this->size();
if($size == 0) {
return array();
}
$data = array_fill(0, (int)(($size + 7) / 8), 0);
$bytes = (int)($size / 8);
$p = 0;
for($i=0; $i<$bytes; $i++) {
$v = 0;
for($j=0; $j<8; $j++) {
$v = $v << 1;
$v |= $this->data[$p];
$p++;
}
$data[$i] = $v;
}
if($size & 7) {
$v = 0;
for($j=0; $j<($size & 7); $j++) {
$v = $v << 1;
$v |= $this->data[$p];
$p++;
}
$data[$bytes] = $v;
}
return $data;
}
}