WP_Http_Encoding::compatible_gzinflate() - Code Metrics - ntwb/wordpress - Measure and Improve Code Quality continuously with Scrutinizer

WP_Http_Encoding::compatible_gzinflate() D
last analyzed 2017-06-24 04:06 UTC

↳ Parent: WP_Http_Encoding

Complexity

Conditions	9
Paths	53

Size

Total Lines	30
Code Lines	21

Duplication

Lines	19
Ratio	63.33 %

Importance

Changes

Metric	Value
cc	9
eloc	21
nc	53
nop	1
dl	19
loc	30
rs	4.909
c	0
b	0
f	0

<?php
/**
 * HTTP API: WP_Http_Encoding class
 *
 * @package WordPress
 * @subpackage HTTP
 * @since 4.4.0
 */

/**
 * Core class used to implement deflate and gzip transfer encoding support for HTTP requests.
 *
 * Includes RFC 1950, RFC 1951, and RFC 1952.
 *
 * @since 2.8.0
 */
class WP_Http_Encoding {

	/**
	 * Compress raw string using the deflate format.
	 *
	 * Supports the RFC 1951 standard.
	 *
	 * @since 2.8.0
	 *
	 * @static
	 *
	 * @param string $raw String to compress.
	 * @param int $level Optional, default is 9. Compression level, 9 is highest.
	 * @param string $supports Optional, not used. When implemented it will choose the right compression based on what the server supports.
	 * @return string|false False on failure.
	 */
	public static function compress( $raw, $level = 9, $supports = null ) {

		return gzdeflate( $raw, $level );
	}

	/**
	 * Decompression of deflated string.
	 *
	 * Will attempt to decompress using the RFC 1950 standard, and if that fails
	 * then the RFC 1951 standard deflate will be attempted. Finally, the RFC
	 * 1952 standard gzip decode will be attempted. If all fail, then the
	 * original compressed string will be returned.
	 *
	 * @since 2.8.0
	 *
	 * @static
	 *
	 * @param string $compressed String to decompress.
	 * @param int $length The optional length of the compressed data.
	 * @return string|bool False on failure.
	 */
	public static function decompress( $compressed, $length = null ) {


		if ( empty($compressed) )
			return $compressed;

		if ( false !== ( $decompressed = @gzinflate( $compressed ) ) )
			return $decompressed;

		if ( false !== ( $decompressed = self::compatible_gzinflate( $compressed ) ) )
			return $decompressed;

		if ( false !== ( $decompressed = @gzuncompress( $compressed ) ) )
			return $decompressed;

		if ( function_exists('gzdecode') ) {
			$decompressed = @gzdecode( $compressed );

			if ( false !== $decompressed )
				return $decompressed;
		}

		return $compressed;
	}

	/**
	 * Decompression of deflated string while staying compatible with the majority of servers.
	 *
	 * Certain Servers will return deflated data with headers which PHP's gzinflate()
	 * function cannot handle out of the box. The following function has been created from
	 * various snippets on the gzinflate() PHP documentation.
	 *
	 * Warning: Magic numbers within. Due to the potential different formats that the compressed
	 * data may be returned in, some "magic offsets" are needed to ensure proper decompression
	 * takes place. For a simple progmatic way to determine the magic offset in use, see:
	 * https://core.trac.wordpress.org/ticket/18273
	 *
	 * @since 2.8.1
	 * @link https://core.trac.wordpress.org/ticket/18273
	 * @link https://secure.php.net/manual/en/function.gzinflate.php#70875
	 * @link https://secure.php.net/manual/en/function.gzinflate.php#77336
	 *
	 * @static
	 *
	 * @param string $gzData String to decompress.
	 * @return string|bool False on failure.
	 */
	public static function compatible_gzinflate($gzData) {

		// Compressed data might contain a full header, if so strip it for gzinflate().
		if ( substr($gzData, 0, 3) == "\x1f\x8b\x08" ) {
			$i = 10;
			$flg = ord( substr($gzData, 3, 1) );
			if ( $flg > 0 ) {
				if ( $flg & 4 ) {
					list($xlen) = unpack('v', substr($gzData, $i, 2) );
					$i = $i + 2 + $xlen;
				}
				if ( $flg & 8 )
					$i = strpos($gzData, "\0", $i) + 1;
				if ( $flg & 16 )
					$i = strpos($gzData, "\0", $i) + 1;
				if ( $flg & 2 )
					$i = $i + 2;
			}
			$decompressed = @gzinflate( substr($gzData, $i, -8) );
			if ( false !== $decompressed )
				return $decompressed;
		}

		// Compressed data from java.util.zip.Deflater amongst others.
		$decompressed = @gzinflate( substr($gzData, 2) );
		if ( false !== $decompressed )
			return $decompressed;

		return false;
	}

	/**
	 * What encoding types to accept and their priority values.
	 *
	 * @since 2.8.0
	 *
	 * @static
	 *
	 * @param string $url
	 * @param array  $args
	 * @return string Types of encoding to accept.
	 */
	public static function accept_encoding( $url, $args ) {
		$type = array();
		$compression_enabled = self::is_available();

		if ( ! $args['decompress'] ) // Decompression specifically disabled.
			$compression_enabled = false;
		elseif ( $args['stream'] ) // Disable when streaming to file.
			$compression_enabled = false;
		elseif ( isset( $args['limit_response_size'] ) ) // If only partial content is being requested, we won't be able to decompress it.
			$compression_enabled = false;

		if ( $compression_enabled ) {
			if ( function_exists( 'gzinflate' ) )
				$type[] = 'deflate;q=1.0';

			if ( function_exists( 'gzuncompress' ) )
				$type[] = 'compress;q=0.5';

			if ( function_exists( 'gzdecode' ) )
				$type[] = 'gzip;q=0.5';
		}

		/**
		 * Filters the allowed encoding types.
		 *
		 * @since 3.6.0
		 *
		 * @param array  $type Encoding types allowed. Accepts 'gzinflate',
		 *                     'gzuncompress', 'gzdecode'.
		 * @param string $url  URL of the HTTP request.
		 * @param array  $args HTTP request arguments.
		 */
		$type = apply_filters( 'wp_http_accept_encoding', $type, $url, $args );

		return implode(', ', $type);
	}

	/**
	 * What encoding the content used when it was compressed to send in the headers.
	 *
	 * @since 2.8.0
	 *
	 * @static
	 *
	 * @return string Content-Encoding string to send in the header.
	 */
	public static function content_encoding() {
		return 'deflate';
	}

	/**
	 * Whether the content be decoded based on the headers.
	 *
	 * @since 2.8.0
	 *
	 * @static
	 *
	 * @param array|string $headers All of the available headers.
	 * @return bool
	 */
	public static function should_decode($headers) {
		if ( is_array( $headers ) ) {
			if ( array_key_exists('content-encoding', $headers) && ! empty( $headers['content-encoding'] ) )
				return true;
		} elseif ( is_string( $headers ) ) {
			return ( stripos($headers, 'content-encoding:') !== false );
		}

		return false;
	}

	/**
	 * Whether decompression and compression are supported by the PHP version.
	 *
	 * Each function is tested instead of checking for the zlib extension, to
	 * ensure that the functions all exist in the PHP version and aren't
	 * disabled.
	 *
	 * @since 2.8.0
	 *
	 * @static
	 *
	 * @return bool
	 */
	public static function is_available() {
		return ( function_exists('gzuncompress') || function_exists('gzdeflate') || function_exists('gzinflate') );
	}
}


1		<?php
2		/**
3		* HTTP API: WP_Http_Encoding class
4		*
5		* @package WordPress
6		* @subpackage HTTP
7		* @since 4.4.0
8		*/
9
10		/**
11		* Core class used to implement deflate and gzip transfer encoding support for HTTP requests.
12		*
13		* Includes RFC 1950, RFC 1951, and RFC 1952.
14		*
15		* @since 2.8.0
16		*/
17		class WP_Http_Encoding {
18
19		/**
20		* Compress raw string using the deflate format.
21		*
22		* Supports the RFC 1951 standard.
23		*
24		* @since 2.8.0
25		*
26		* @static
27		*
28		* @param string $raw String to compress.
29		* @param int $level Optional, default is 9. Compression level, 9 is highest.
30		* @param string $supports Optional, not used. When implemented it will choose the right compression based on what the server supports.
31		* @return string\|false False on failure.
32		*/
33		public static function compress( $raw, $level = 9, $supports = null ) {
		0 ignored issues – show Unused Code introduced 2016-03-16 22:18 UTC by Report Bug Copy Issue Report The parameter `$supports` is not used and could be removed. This check looks from parameters that have been defined for a function or method, but which are not used in the method body. Loading history...
34		return gzdeflate( $raw, $level );
35		}
36
37		/**
38		* Decompression of deflated string.
39		*
40		* Will attempt to decompress using the RFC 1950 standard, and if that fails
41		* then the RFC 1951 standard deflate will be attempted. Finally, the RFC
42		* 1952 standard gzip decode will be attempted. If all fail, then the
43		* original compressed string will be returned.
44		*
45		* @since 2.8.0
46		*
47		* @static
48		*
49		* @param string $compressed String to decompress.
50		* @param int $length The optional length of the compressed data.
51		* @return string\|bool False on failure.
52		*/
53		public static function decompress( $compressed, $length = null ) {
		0 ignored issues – show Unused Code introduced 2015-12-17 04:17 UTC by Report Bug Copy Issue Report The parameter `$length` is not used and could be removed. This check looks from parameters that have been defined for a function or method, but which are not used in the method body. Loading history...
54
55		if ( empty($compressed) )
56		return $compressed;
57
58		if ( false !== ( $decompressed = @gzinflate( $compressed ) ) )
59		return $decompressed;
60
61		if ( false !== ( $decompressed = self::compatible_gzinflate( $compressed ) ) )
62		return $decompressed;
63
64		if ( false !== ( $decompressed = @gzuncompress( $compressed ) ) )
65		return $decompressed;
66
67		if ( function_exists('gzdecode') ) {
68		$decompressed = @gzdecode( $compressed );
69
70		if ( false !== $decompressed )
71		return $decompressed;
72		}
73
74		return $compressed;
75		}
76
77		/**
78		* Decompression of deflated string while staying compatible with the majority of servers.
79		*
80		* Certain Servers will return deflated data with headers which PHP's gzinflate()
81		* function cannot handle out of the box. The following function has been created from
82		* various snippets on the gzinflate() PHP documentation.
83		*
84		* Warning: Magic numbers within. Due to the potential different formats that the compressed
85		* data may be returned in, some "magic offsets" are needed to ensure proper decompression
86		* takes place. For a simple progmatic way to determine the magic offset in use, see:
87		* https://core.trac.wordpress.org/ticket/18273
88		*
89		* @since 2.8.1
90		* @link https://core.trac.wordpress.org/ticket/18273
91		* @link https://secure.php.net/manual/en/function.gzinflate.php#70875
92		* @link https://secure.php.net/manual/en/function.gzinflate.php#77336
93		*
94		* @static
95		*
96		* @param string $gzData String to decompress.
97		* @return string\|bool False on failure.
98		*/
99		public static function compatible_gzinflate($gzData) {
100
101		// Compressed data might contain a full header, if so strip it for gzinflate().
102	View Code Duplication	if ( substr($gzData, 0, 3) == "\x1f\x8b\x08" ) {
103		$i = 10;
104		$flg = ord( substr($gzData, 3, 1) );
105		if ( $flg > 0 ) {
106		if ( $flg & 4 ) {
107		list($xlen) = unpack('v', substr($gzData, $i, 2) );
108		$i = $i + 2 + $xlen;
109		}
110		if ( $flg & 8 )
111		$i = strpos($gzData, "\0", $i) + 1;
112		if ( $flg & 16 )
113		$i = strpos($gzData, "\0", $i) + 1;
114		if ( $flg & 2 )
115		$i = $i + 2;
116		}
117		$decompressed = @gzinflate( substr($gzData, $i, -8) );
118		if ( false !== $decompressed )
119		return $decompressed;
120		}
121
122		// Compressed data from java.util.zip.Deflater amongst others.
123		$decompressed = @gzinflate( substr($gzData, 2) );
124		if ( false !== $decompressed )
125		return $decompressed;
126
127		return false;
128		}
129
130		/**
131		* What encoding types to accept and their priority values.
132		*
133		* @since 2.8.0
134		*
135		* @static
136		*
137		* @param string $url
138		* @param array $args
139		* @return string Types of encoding to accept.
140		*/
141		public static function accept_encoding( $url, $args ) {
142		$type = array();
143		$compression_enabled = self::is_available();
144
145		if ( ! $args['decompress'] ) // Decompression specifically disabled.
146		$compression_enabled = false;
147		elseif ( $args['stream'] ) // Disable when streaming to file.
148		$compression_enabled = false;
149		elseif ( isset( $args['limit_response_size'] ) ) // If only partial content is being requested, we won't be able to decompress it.
150		$compression_enabled = false;
151
152		if ( $compression_enabled ) {
153		if ( function_exists( 'gzinflate' ) )
154		$type[] = 'deflate;q=1.0';
155
156		if ( function_exists( 'gzuncompress' ) )
157		$type[] = 'compress;q=0.5';
158
159		if ( function_exists( 'gzdecode' ) )
160		$type[] = 'gzip;q=0.5';
161		}
162
163		/**
164		* Filters the allowed encoding types.
165		*
166		* @since 3.6.0
167		*
168		* @param array $type Encoding types allowed. Accepts 'gzinflate',
169		* 'gzuncompress', 'gzdecode'.
170		* @param string $url URL of the HTTP request.
171		* @param array $args HTTP request arguments.
172		*/
173		$type = apply_filters( 'wp_http_accept_encoding', $type, $url, $args );
174
175		return implode(', ', $type);
176		}
177
178		/**
179		* What encoding the content used when it was compressed to send in the headers.
180		*
181		* @since 2.8.0
182		*
183		* @static
184		*
185		* @return string Content-Encoding string to send in the header.
186		*/
187		public static function content_encoding() {
188		return 'deflate';
189		}
190
191		/**
192		* Whether the content be decoded based on the headers.
193		*
194		* @since 2.8.0
195		*
196		* @static
197		*
198		* @param array\|string $headers All of the available headers.
199		* @return bool
200		*/
201		public static function should_decode($headers) {
202		if ( is_array( $headers ) ) {
203		if ( array_key_exists('content-encoding', $headers) && ! empty( $headers['content-encoding'] ) )
204		return true;
205		} elseif ( is_string( $headers ) ) {
206		return ( stripos($headers, 'content-encoding:') !== false );
207		}
208
209		return false;
210		}
211
212		/**
213		* Whether decompression and compression are supported by the PHP version.
214		*
215		* Each function is tested instead of checking for the zlib extension, to
216		* ensure that the functions all exist in the PHP version and aren't
217		* disabled.
218		*
219		* @since 2.8.0
220		*
221		* @static
222		*
223		* @return bool
224		*/
225		public static function is_available() {
226		return ( function_exists('gzuncompress') \|\| function_exists('gzdeflate') \|\| function_exists('gzinflate') );
227		}
228		}
229

ntwb / wordpress

WP_Http_Encoding::compatible_gzinflate() D last analyzed 2017-06-24 04:06 UTC

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WP_Http_Encoding::compatible_gzinflate() D
last analyzed 2017-06-24 04:06 UTC