--- /dev/null
+<?php
+/**
+ * SimplePie
+ *
+ * A PHP-Based RSS and Atom Feed Framework.
+ * Takes the hard work out of managing a complete RSS/Atom solution.
+ *
+ * Copyright (c) 2004-2012, Ryan Parman, Geoffrey Sneddon, Ryan McCue, and contributors
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification, are
+ * permitted provided that the following conditions are met:
+ *
+ * * Redistributions of source code must retain the above copyright notice, this list of
+ * conditions and the following disclaimer.
+ *
+ * * Redistributions in binary form must reproduce the above copyright notice, this list
+ * of conditions and the following disclaimer in the documentation and/or other materials
+ * provided with the distribution.
+ *
+ * * Neither the name of the SimplePie Team nor the names of its contributors may be used
+ * to endorse or promote products derived from this software without specific prior
+ * written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS
+ * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
+ * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS
+ * AND CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * @package SimplePie
+ * @version 1.3.1
+ * @copyright 2004-2012 Ryan Parman, Geoffrey Sneddon, Ryan McCue
+ * @author Ryan Parman
+ * @author Geoffrey Sneddon
+ * @author Ryan McCue
+ * @link http://simplepie.org/ SimplePie
+ * @license http://www.opensource.org/licenses/bsd-license.php BSD License
+ */
+
+
+/**
+ * Decode 'gzip' encoded HTTP data
+ *
+ * @package SimplePie
+ * @subpackage HTTP
+ * @link http://www.gzip.org/format.txt
+ */
+class SimplePie_gzdecode
+{
+ /**
+ * Compressed data
+ *
+ * @access private
+ * @var string
+ * @see gzdecode::$data
+ */
+ var $compressed_data;
+
+ /**
+ * Size of compressed data
+ *
+ * @access private
+ * @var int
+ */
+ var $compressed_size;
+
+ /**
+ * Minimum size of a valid gzip string
+ *
+ * @access private
+ * @var int
+ */
+ var $min_compressed_size = 18;
+
+ /**
+ * Current position of pointer
+ *
+ * @access private
+ * @var int
+ */
+ var $position = 0;
+
+ /**
+ * Flags (FLG)
+ *
+ * @access private
+ * @var int
+ */
+ var $flags;
+
+ /**
+ * Uncompressed data
+ *
+ * @access public
+ * @see gzdecode::$compressed_data
+ * @var string
+ */
+ var $data;
+
+ /**
+ * Modified time
+ *
+ * @access public
+ * @var int
+ */
+ var $MTIME;
+
+ /**
+ * Extra Flags
+ *
+ * @access public
+ * @var int
+ */
+ var $XFL;
+
+ /**
+ * Operating System
+ *
+ * @access public
+ * @var int
+ */
+ var $OS;
+
+ /**
+ * Subfield ID 1
+ *
+ * @access public
+ * @see gzdecode::$extra_field
+ * @see gzdecode::$SI2
+ * @var string
+ */
+ var $SI1;
+
+ /**
+ * Subfield ID 2
+ *
+ * @access public
+ * @see gzdecode::$extra_field
+ * @see gzdecode::$SI1
+ * @var string
+ */
+ var $SI2;
+
+ /**
+ * Extra field content
+ *
+ * @access public
+ * @see gzdecode::$SI1
+ * @see gzdecode::$SI2
+ * @var string
+ */
+ var $extra_field;
+
+ /**
+ * Original filename
+ *
+ * @access public
+ * @var string
+ */
+ var $filename;
+
+ /**
+ * Human readable comment
+ *
+ * @access public
+ * @var string
+ */
+ var $comment;
+
+ /**
+ * Don't allow anything to be set
+ *
+ * @param string $name
+ * @param mixed $value
+ */
+ public function __set($name, $value)
+ {
+ trigger_error("Cannot write property $name", E_USER_ERROR);
+ }
+
+ /**
+ * Set the compressed string and related properties
+ *
+ * @param string $data
+ */
+ public function __construct($data)
+ {
+ $this->compressed_data = $data;
+ $this->compressed_size = strlen($data);
+ }
+
+ /**
+ * Decode the GZIP stream
+ *
+ * @return bool Successfulness
+ */
+ public function parse()
+ {
+ if ($this->compressed_size >= $this->min_compressed_size)
+ {
+ // Check ID1, ID2, and CM
+ if (substr($this->compressed_data, 0, 3) !== "\x1F\x8B\x08")
+ {
+ return false;
+ }
+
+ // Get the FLG (FLaGs)
+ $this->flags = ord($this->compressed_data[3]);
+
+ // FLG bits above (1 << 4) are reserved
+ if ($this->flags > 0x1F)
+ {
+ return false;
+ }
+
+ // Advance the pointer after the above
+ $this->position += 4;
+
+ // MTIME
+ $mtime = substr($this->compressed_data, $this->position, 4);
+ // Reverse the string if we're on a big-endian arch because l is the only signed long and is machine endianness
+ if (current(unpack('S', "\x00\x01")) === 1)
+ {
+ $mtime = strrev($mtime);
+ }
+ $this->MTIME = current(unpack('l', $mtime));
+ $this->position += 4;
+
+ // Get the XFL (eXtra FLags)
+ $this->XFL = ord($this->compressed_data[$this->position++]);
+
+ // Get the OS (Operating System)
+ $this->OS = ord($this->compressed_data[$this->position++]);
+
+ // Parse the FEXTRA
+ if ($this->flags & 4)
+ {
+ // Read subfield IDs
+ $this->SI1 = $this->compressed_data[$this->position++];
+ $this->SI2 = $this->compressed_data[$this->position++];
+
+ // SI2 set to zero is reserved for future use
+ if ($this->SI2 === "\x00")
+ {
+ return false;
+ }
+
+ // Get the length of the extra field
+ $len = current(unpack('v', substr($this->compressed_data, $this->position, 2)));
+ $this->position += 2;
+
+ // Check the length of the string is still valid
+ $this->min_compressed_size += $len + 4;
+ if ($this->compressed_size >= $this->min_compressed_size)
+ {
+ // Set the extra field to the given data
+ $this->extra_field = substr($this->compressed_data, $this->position, $len);
+ $this->position += $len;
+ }
+ else
+ {
+ return false;
+ }
+ }
+
+ // Parse the FNAME
+ if ($this->flags & 8)
+ {
+ // Get the length of the filename
+ $len = strcspn($this->compressed_data, "\x00", $this->position);
+
+ // Check the length of the string is still valid
+ $this->min_compressed_size += $len + 1;
+ if ($this->compressed_size >= $this->min_compressed_size)
+ {
+ // Set the original filename to the given string
+ $this->filename = substr($this->compressed_data, $this->position, $len);
+ $this->position += $len + 1;
+ }
+ else
+ {
+ return false;
+ }
+ }
+
+ // Parse the FCOMMENT
+ if ($this->flags & 16)
+ {
+ // Get the length of the comment
+ $len = strcspn($this->compressed_data, "\x00", $this->position);
+
+ // Check the length of the string is still valid
+ $this->min_compressed_size += $len + 1;
+ if ($this->compressed_size >= $this->min_compressed_size)
+ {
+ // Set the original comment to the given string
+ $this->comment = substr($this->compressed_data, $this->position, $len);
+ $this->position += $len + 1;
+ }
+ else
+ {
+ return false;
+ }
+ }
+
+ // Parse the FHCRC
+ if ($this->flags & 2)
+ {
+ // Check the length of the string is still valid
+ $this->min_compressed_size += $len + 2;
+ if ($this->compressed_size >= $this->min_compressed_size)
+ {
+ // Read the CRC
+ $crc = current(unpack('v', substr($this->compressed_data, $this->position, 2)));
+
+ // Check the CRC matches
+ if ((crc32(substr($this->compressed_data, 0, $this->position)) & 0xFFFF) === $crc)
+ {
+ $this->position += 2;
+ }
+ else
+ {
+ return false;
+ }
+ }
+ else
+ {
+ return false;
+ }
+ }
+
+ // Decompress the actual data
+ if (($this->data = gzinflate(substr($this->compressed_data, $this->position, -8))) === false)
+ {
+ return false;
+ }
+ else
+ {
+ $this->position = $this->compressed_size - 8;
+ }
+
+ // Check CRC of data
+ $crc = current(unpack('V', substr($this->compressed_data, $this->position, 4)));
+ $this->position += 4;
+ /*if (extension_loaded('hash') && sprintf('%u', current(unpack('V', hash('crc32b', $this->data)))) !== sprintf('%u', $crc))
+ {
+ return false;
+ }*/
+
+ // Check ISIZE of data
+ $isize = current(unpack('V', substr($this->compressed_data, $this->position, 4)));
+ $this->position += 4;
+ if (sprintf('%u', strlen($this->data) & 0xFFFFFFFF) !== sprintf('%u', $isize))
+ {
+ return false;
+ }
+
+ // Wow, against all odds, we've actually got a valid gzip string
+ return true;
+ }
+ else
+ {
+ return false;
+ }
+ }
+}
scripts.mit.edu / autoinstalls / wordpress.git / blobdiff