BCGDrawPNG::crc() - Code Metrics - majiameng/QrCode-php - Measure and Improve Code Quality continuously with Scrutinizer

BCGDrawPNG::crc() A
last analyzed 2024-12-12 08:51 UTC

↳ Parent: BCGDrawPNG

Complexity

Conditions	1
Paths	1

Size

Total Lines	2
Code Lines	1

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
cc	1
eloc	1
nc	1
nop	2
dl	0
loc	2
rs	10
c	0
b	0
f	0

<?php
namespace tinymeng\code\Gateways\barcode\drawer;

/**
 *--------------------------------------------------------------------
 *
 * Image Class to draw PNG images with possibility to set DPI
 *
 *--------------------------------------------------------------------
 * Copyright (C) Jean-Sebastien Goupil
 * http://www.barcodephp.com
 */
if (!function_exists('file_put_contents')) {
    function file_put_contents($filename, $data) {
        $f = @fopen($filename, 'w');
        if (!$f) {

            return false;
        } else {
            $bytes = fwrite($f, $data);
            fclose($f);
            return $bytes;
        }
    }
}

class BCGDrawPNG extends BCGDraw {
    private $dpi;
    
    /**
     * Constructor.
     *
     * @param resource $im
     */
    public function __construct($im) {
        parent::__construct($im);
    }

    /**
     * Sets the DPI.
     *
     * @param int $dpi
     */
    public function setDPI($dpi) {
        if (is_numeric($dpi)) {

            $this->dpi = max(1, $dpi);
        } else {
            $this->dpi = null;
        }
    }

    /**
     * Draws the PNG on the screen or in a file.
     */
    public function draw() {
        ob_start();
        imagepng($this->im);
        $bin = ob_get_contents();
        ob_end_clean();

        $this->setInternalProperties($bin);

        if (empty($this->filename)) {
            echo $bin;
        } else {
            file_put_contents($this->filename, $bin);
        }
    }

    private function setInternalProperties(&$bin) {
        // Scan all the ChunkType
        if (strcmp(substr($bin, 0, 8), pack('H*', '89504E470D0A1A0A')) === 0) {
            $chunks = $this->detectChunks($bin);

            $this->internalSetDPI($bin, $chunks);
            $this->internalSetC($bin, $chunks);
        }
    }

    private function detectChunks($bin) {
        $data = substr($bin, 8);
        $chunks = array();
        $c = strlen($data);
        
        $offset = 0;
        while ($offset < $c) {
            $packed = unpack('Nsize/a4chunk', $data);
            $size = $packed['size'];
            $chunk = $packed['chunk'];

            $chunks[] = array('offset' => $offset + 8, 'size' => $size, 'chunk' => $chunk);
            $jump = $size + 12;
            $offset += $jump;
            $data = substr($data, $jump);
        }
        
        return $chunks;
    }

    private function internalSetDPI(&$bin, &$chunks) {
        if ($this->dpi !== null) {
            $meters = (int)($this->dpi * 39.37007874);

            $found = -1;
            $c = count($chunks);
            for($i = 0; $i < $c; $i++) {
                // We already have a pHYs
                if($chunks[$i]['chunk'] === 'pHYs') {
                    $found = $i;
                    break;
                }
            }

            $data = 'pHYs' . pack('NNC', $meters, $meters, 0x01);
            $crc = self::crc($data, 13);
            $cr = pack('Na13N', 9, $data, $crc);

            // We didn't have a pHYs
            if($found == -1) {
                // Don't do anything if we have a bad PNG
                if($c >= 2 && $chunks[0]['chunk'] === 'IHDR') {
                    array_splice($chunks, 1, 0, array(array('offset' => 33, 'size' => 9, 'chunk' => 'pHYs')));

                    // Push the data
                    for($i = 2; $i < $c; $i++) {
                        $chunks[$i]['offset'] += 21;
                    }

                    $firstPart = substr($bin, 0, 33);
                    $secondPart = substr($bin, 33);
                    $bin = $firstPart;
                    $bin .= $cr;
                    $bin .= $secondPart;
                }
            } else {
                $bin = substr_replace($bin, $cr, $chunks[$i]['offset'], 21);
            }
        }
    }

    private function internalSetC(&$bin, &$chunks) {
        if (count($chunks) >= 2 && $chunks[0]['chunk'] === 'IHDR') {
            $firstPart = substr($bin, 0, 33);
            $secondPart = substr($bin, 33);
            $cr = pack('H*', '0000004C74455874436F707972696768740047656E657261746564207769746820426172636F64652047656E657261746F7220666F722050485020687474703A2F2F7777772E626172636F64657068702E636F6D597F70B8');
            $bin = $firstPart;
            $bin .= $cr;
            $bin .= $secondPart;
        }
        
        // Chunks is dirty!! But we are done.
    }

    private static $crc_table = array();
    private static $crc_table_computed = false;

    private static function make_crc_table() {
        for ($n = 0; $n < 256; $n++) {
            $c = $n;
            for ($k = 0; $k < 8; $k++) {
                if (($c & 1) == 1) {
                    $c = 0xedb88320 ^ (self::SHR($c, 1));
                } else {
                    $c = self::SHR($c, 1);
                }
            }
            self::$crc_table[$n] = $c;
        }

        self::$crc_table_computed = true;
    }

    private static function SHR($x, $n) {
        $mask = 0x40000000;

        if ($x < 0) {
            $x &= 0x7FFFFFFF;
            $mask = $mask >> ($n - 1);
            return ($x >> $n) | $mask;
        }

        return (int)$x >> (int)$n;
    }

    private static function update_crc($crc, $buf, $len) {
        $c = $crc;

        if (!self::$crc_table_computed) {
            self::make_crc_table();
        }

        for ($n = 0; $n < $len; $n++) {
            $c = self::$crc_table[($c ^ ord($buf[$n])) & 0xff] ^ (self::SHR($c, 8));
        }

        return $c;
    }

    private static function crc($data, $len) {
        return self::update_crc(-1, $data, $len) ^ -1;
    }
}
?>



1			<?php
2			namespace tinymeng\code\Gateways\barcode\drawer;
3
4			/**
5			*--------------------------------------------------------------------
6			*
7			* Image Class to draw PNG images with possibility to set DPI
8			*
9			*--------------------------------------------------------------------
10			* Copyright (C) Jean-Sebastien Goupil
11			* http://www.barcodephp.com
12			*/
13			if (!function_exists('file_put_contents')) {
14			function file_put_contents($filename, $data) {
15			$f = @fopen($filename, 'w');
16			if (!$f) {
			0 ignored issues – show introduced 2024-12-12 08:42 UTC by Report Bug Copy Issue Report `$f` is of type `false\|resource`, thus it always evaluated to `false`. Loading history...
17			return false;
18			} else {
19			$bytes = fwrite($f, $data);
20			fclose($f);
21			return $bytes;
22			}
23			}
24			}
25
26			class BCGDrawPNG extends BCGDraw {
27			private $dpi;
28
29			/**
30			* Constructor.
31			*
32			* @param resource $im
33			*/
34			public function __construct($im) {
35			parent::__construct($im);
36			}
37
38			/**
39			* Sets the DPI.
40			*
41			* @param int $dpi
42			*/
43			public function setDPI($dpi) {
44			if (is_numeric($dpi)) {
			0 ignored issues – show introduced 2024-12-12 08:42 UTC by Report Bug Copy Issue Report The condition `is_numeric($dpi)` is always `true`. Loading history...
45			$this->dpi = max(1, $dpi);
46			} else {
47			$this->dpi = null;
48			}
49			}
50
51			/**
52			* Draws the PNG on the screen or in a file.
53			*/
54			public function draw() {
55			ob_start();
56			imagepng($this->im);
57			$bin = ob_get_contents();
58			ob_end_clean();
59
60			$this->setInternalProperties($bin);
61
62			if (empty($this->filename)) {
63			echo $bin;
64			} else {
65			file_put_contents($this->filename, $bin);
66			}
67			}
68
69			private function setInternalProperties(&$bin) {
70			// Scan all the ChunkType
71			if (strcmp(substr($bin, 0, 8), pack('H*', '89504E470D0A1A0A')) === 0) {
72			$chunks = $this->detectChunks($bin);
73
74			$this->internalSetDPI($bin, $chunks);
75			$this->internalSetC($bin, $chunks);
76			}
77			}
78
79			private function detectChunks($bin) {
80			$data = substr($bin, 8);
81			$chunks = array();
82			$c = strlen($data);
83
84			$offset = 0;
85			while ($offset < $c) {
86			$packed = unpack('Nsize/a4chunk', $data);
87			$size = $packed['size'];
88			$chunk = $packed['chunk'];
89
90			$chunks[] = array('offset' => $offset + 8, 'size' => $size, 'chunk' => $chunk);
91			$jump = $size + 12;
92			$offset += $jump;
93			$data = substr($data, $jump);
94			}
95
96			return $chunks;
97			}
98
99			private function internalSetDPI(&$bin, &$chunks) {
100			if ($this->dpi !== null) {
101			$meters = (int)($this->dpi * 39.37007874);
102
103			$found = -1;
104			$c = count($chunks);
105			for($i = 0; $i < $c; $i++) {
106			// We already have a pHYs
107			if($chunks[$i]['chunk'] === 'pHYs') {
108			$found = $i;
109			break;
110			}
111			}
112
113			$data = 'pHYs' . pack('NNC', $meters, $meters, 0x01);
114			$crc = self::crc($data, 13);
115			$cr = pack('Na13N', 9, $data, $crc);
116
117			// We didn't have a pHYs
118			if($found == -1) {
119			// Don't do anything if we have a bad PNG
120			if($c >= 2 && $chunks[0]['chunk'] === 'IHDR') {
121			array_splice($chunks, 1, 0, array(array('offset' => 33, 'size' => 9, 'chunk' => 'pHYs')));
122
123			// Push the data
124			for($i = 2; $i < $c; $i++) {
125			$chunks[$i]['offset'] += 21;
126			}
127
128			$firstPart = substr($bin, 0, 33);
129			$secondPart = substr($bin, 33);
130			$bin = $firstPart;
131			$bin .= $cr;
132			$bin .= $secondPart;
133			}
134			} else {
135			$bin = substr_replace($bin, $cr, $chunks[$i]['offset'], 21);
136			}
137			}
138			}
139
140			private function internalSetC(&$bin, &$chunks) {
141			if (count($chunks) >= 2 && $chunks[0]['chunk'] === 'IHDR') {
142			$firstPart = substr($bin, 0, 33);
143			$secondPart = substr($bin, 33);
144			$cr = pack('H*', '0000004C74455874436F707972696768740047656E657261746564207769746820426172636F64652047656E657261746F7220666F722050485020687474703A2F2F7777772E626172636F64657068702E636F6D597F70B8');
145			$bin = $firstPart;
146			$bin .= $cr;
147			$bin .= $secondPart;
148			}
149
150			// Chunks is dirty!! But we are done.
151			}
152
153			private static $crc_table = array();
154			private static $crc_table_computed = false;
155
156			private static function make_crc_table() {
157			for ($n = 0; $n < 256; $n++) {
158			$c = $n;
159			for ($k = 0; $k < 8; $k++) {
160			if (($c & 1) == 1) {
161			$c = 0xedb88320 ^ (self::SHR($c, 1));
162			} else {
163			$c = self::SHR($c, 1);
164			}
165			}
166			self::$crc_table[$n] = $c;
167			}
168
169			self::$crc_table_computed = true;
170			}
171
172			private static function SHR($x, $n) {
173			$mask = 0x40000000;
174
175			if ($x < 0) {
176			$x &= 0x7FFFFFFF;
177			$mask = $mask >> ($n - 1);
178			return ($x >> $n) \| $mask;
179			}
180
181			return (int)$x >> (int)$n;
182			}
183
184			private static function update_crc($crc, $buf, $len) {
185			$c = $crc;
186
187			if (!self::$crc_table_computed) {
188			self::make_crc_table();
189			}
190
191			for ($n = 0; $n < $len; $n++) {
192			$c = self::$crc_table[($c ^ ord($buf[$n])) & 0xff] ^ (self::SHR($c, 8));
193			}
194
195			return $c;
196			}
197
198			private static function crc($data, $len) {
199			return self::update_crc(-1, $data, $len) ^ -1;
200			}
201			}
202			?>
			0 ignored issues – show Best Practice introduced 2024-12-12 08:42 UTC by Report Bug Copy Issue Report It is not recommended to use PHP's closing tag `?>` in files other than templates. Using a closing tag in PHP files that only contain PHP code is not recommended as you might accidentally add whitespace after the closing tag which would then be output by PHP. This can cause severe problems, for example headers cannot be sent anymore. A simple precaution is to leave off the closing tag as it is not required, and it also has no negative effects whatsoever. Loading history...
203

majiameng / QrCode-php

BCGDrawPNG::crc() A last analyzed 2024-12-12 08:51 UTC

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BCGDrawPNG::crc() A
last analyzed 2024-12-12 08:51 UTC