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317 lines
12 KiB
JavaScript
317 lines
12 KiB
JavaScript
/*
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packer, version 2.0.2 (2005-08-19)
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Copyright 2004-2005, Dean Edwards
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License: http://creativecommons.org/licenses/LGPL/2.1/
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*/
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function pack(_script, _encoding, _fastDecode, _specialChars) {
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// constants
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var $IGNORE = "$1";
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// validate parameters
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_script += "\n";
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_encoding = Math.min(parseInt(_encoding), 95);
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// apply all parsing routines
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function _pack($script) {
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var i, $parse;
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for (i = 0; ($parse = _parsers[i]); i++) {
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$script = $parse($script);
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}
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return $script;
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};
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// unpacking function - this is the boot strap function
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// data extracted from this packing routine is passed to
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// this function when decoded in the target
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var _unpack = function($packed, $ascii, $count, $keywords, $encode, $decode) {
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while ($count--)
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if ($keywords[$count])
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$packed = $packed.replace(new RegExp('\\b' + $encode($count) + '\\b', 'g'), $keywords[$count]);
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return $packed;
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};
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// code-snippet inserted into the unpacker to speed up decoding
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var _decode = function() {
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// does the browser support String.replace where the
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// replacement value is a function?
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if (!''.replace(/^/, String)) {
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// decode all the values we need
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while ($count--) $decode[$encode($count)] = $keywords[$count] || $encode($count);
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// global replacement function
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$keywords = [function($encoded){return $decode[$encoded]}];
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// generic match
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$encode = function(){return'\\w+'};
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// reset the loop counter - we are now doing a global replace
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$count = 1;
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}
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};
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// keep a list of parsing functions, they'll be executed all at once
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var _parsers = [];
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function _addParser($parser) {
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_parsers[_parsers.length] = $parser;
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};
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// zero encoding - just removal of white space and comments
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function _basicCompression($script) {
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var $parser = new ParseMaster;
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// make safe
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$parser.escapeChar = "\\";
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// protect strings
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$parser.add(/'[^'\n\r]*'/, $IGNORE);
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$parser.add(/"[^"\n\r]*"/, $IGNORE);
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// remove comments
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$parser.add(/\/\/[^\n\r]*[\n\r]/, " ");
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$parser.add(/\/\*[^*]*\*+([^\/][^*]*\*+)*\//, " ");
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// protect regular expressions
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$parser.add(/\s+(\/[^\/\n\r\*][^\/\n\r]*\/g?i?)/, "$2"); // IGNORE
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$parser.add(/[^\w\x24\/'"*)\?:]\/[^\/\n\r\*][^\/\n\r]*\/g?i?/, $IGNORE);
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// remove: ;;; doSomething();
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if (_specialChars) $parser.add(/;;;[^\n\r]+[\n\r]/);
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// remove redundant semi-colons
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$parser.add(/\(;;\)/, $IGNORE); // protect for (;;) loops
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$parser.add(/;+\s*([};])/, "$2");
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// apply the above
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$script = $parser.exec($script);
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// remove white-space
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$parser.add(/(\b|\x24)\s+(\b|\x24)/, "$2 $3");
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$parser.add(/([+\-])\s+([+\-])/, "$2 $3");
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$parser.add(/\s+/, "");
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// done
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return $parser.exec($script);
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};
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function _encodeSpecialChars($script) {
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var $parser = new ParseMaster;
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// replace: $name -> n, $$name -> na
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$parser.add(/((\x24+)([a-zA-Z$_]+))(\d*)/, function($match, $offset) {
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var $length = $match[$offset + 2].length;
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var $start = $length - Math.max($length - $match[$offset + 3].length, 0);
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return $match[$offset + 1].substr($start, $length) + $match[$offset + 4];
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});
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// replace: _name -> _0, double-underscore (__name) is ignored
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var $regexp = /\b_[A-Za-z\d]\w*/;
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// build the word list
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var $keywords = _analyze($script, _globalize($regexp), _encodePrivate);
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// quick ref
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var $encoded = $keywords.$encoded;
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$parser.add($regexp, function($match, $offset) {
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return $encoded[$match[$offset]];
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});
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return $parser.exec($script);
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};
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function _encodeKeywords($script) {
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// escape high-ascii values already in the script (i.e. in strings)
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if (_encoding > 62) $script = _escape95($script);
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// create the parser
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var $parser = new ParseMaster;
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var $encode = _getEncoder(_encoding);
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// for high-ascii, don't encode single character low-ascii
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var $regexp = (_encoding > 62) ? /\w\w+/ : /\w+/;
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// build the word list
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$keywords = _analyze($script, _globalize($regexp), $encode);
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var $encoded = $keywords.$encoded;
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// encode
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$parser.add($regexp, function($match, $offset) {
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return $encoded[$match[$offset]];
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});
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// if encoded, wrap the script in a decoding function
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return $script && _bootStrap($parser.exec($script), $keywords);
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};
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function _analyze($script, $regexp, $encode) {
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// analyse
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// retreive all words in the script
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var $all = $script.match($regexp);
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var $$sorted = []; // list of words sorted by frequency
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var $$encoded = {}; // dictionary of word->encoding
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var $$protected = {}; // instances of "protected" words
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if ($all) {
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var $unsorted = []; // same list, not sorted
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var $protected = {}; // "protected" words (dictionary of word->"word")
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var $values = {}; // dictionary of charCode->encoding (eg. 256->ff)
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var $count = {}; // word->count
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var i = $all.length, j = 0, $word;
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// count the occurrences - used for sorting later
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do {
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$word = "$" + $all[--i];
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if (!$count[$word]) {
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$count[$word] = 0;
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$unsorted[j] = $word;
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// make a dictionary of all of the protected words in this script
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// these are words that might be mistaken for encoding
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$protected["$" + ($values[j] = $encode(j))] = j++;
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}
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// increment the word counter
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$count[$word]++;
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} while (i);
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// prepare to sort the word list, first we must protect
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// words that are also used as codes. we assign them a code
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// equivalent to the word itself.
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// e.g. if "do" falls within our encoding range
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// then we store keywords["do"] = "do";
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// this avoids problems when decoding
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i = $unsorted.length;
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do {
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$word = $unsorted[--i];
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if ($protected[$word] != null) {
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$$sorted[$protected[$word]] = $word.slice(1);
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$$protected[$protected[$word]] = true;
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$count[$word] = 0;
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}
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} while (i);
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// sort the words by frequency
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$unsorted.sort(function($match1, $match2) {
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return $count[$match2] - $count[$match1];
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});
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j = 0;
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// because there are "protected" words in the list
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// we must add the sorted words around them
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do {
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if ($$sorted[i] == null) $$sorted[i] = $unsorted[j++].slice(1);
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$$encoded[$$sorted[i]] = $values[i];
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} while (++i < $unsorted.length);
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}
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return {$sorted: $$sorted, $encoded: $$encoded, $protected: $$protected};
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};
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// build the boot function used for loading and decoding
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function _bootStrap($packed, $keywords) {
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var $ENCODE = _safeRegExp("$encode\\($count\\)", "g");
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// $packed: the packed script
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$packed = "'" + _escape($packed) + "'";
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// $ascii: base for encoding
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var $ascii = Math.min($keywords.$sorted.length, _encoding) || 1;
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// $count: number of words contained in the script
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var $count = $keywords.$sorted.length;
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// $keywords: list of words contained in the script
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for (var i in $keywords.$protected) $keywords.$sorted[i] = "";
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// convert from a string to an array
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$keywords = "'" + $keywords.$sorted.join("|") + "'.split('|')";
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// $encode: encoding function (used for decoding the script)
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var $encode = _encoding > 62 ? _encode95 : _getEncoder($ascii);
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$encode = String($encode).replace(/_encoding/g, "$ascii").replace(/arguments\.callee/g, "$encode");
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var $inline = "$count" + ($ascii > 10 ? ".toString($ascii)" : "");
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// $decode: code snippet to speed up decoding
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if (_fastDecode) {
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// create the decoder
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var $decode = _getFunctionBody(_decode);
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if (_encoding > 62) $decode = $decode.replace(/\\\\w/g, "[\\xa1-\\xff]");
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// perform the encoding inline for lower ascii values
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else if ($ascii < 36) $decode = $decode.replace($ENCODE, $inline);
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// special case: when $count==0 there are no keywords. I want to keep
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// the basic shape of the unpacking funcion so i'll frig the code...
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if (!$count) $decode = $decode.replace(_safeRegExp("($count)\\s*=\\s*1"), "$1=0");
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}
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// boot function
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var $unpack = String(_unpack);
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if (_fastDecode) {
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// insert the decoder
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$unpack = $unpack.replace(/\{/, "{" + $decode + ";");
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}
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$unpack = $unpack.replace(/"/g, "'");
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if (_encoding > 62) { // high-ascii
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// get rid of the word-boundaries for regexp matches
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$unpack = $unpack.replace(/'\\\\b'\s*\+|\+\s*'\\\\b'/g, "");
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}
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if ($ascii > 36 || _encoding > 62 || _fastDecode) {
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// insert the encode function
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$unpack = $unpack.replace(/\{/, "{$encode=" + $encode + ";");
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} else {
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// perform the encoding inline
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$unpack = $unpack.replace($ENCODE, $inline);
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}
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// pack the boot function too
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$unpack = pack($unpack, 0, false, true);
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// arguments
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var $params = [$packed, $ascii, $count, $keywords];
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if (_fastDecode) {
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// insert placeholders for the decoder
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$params = $params.concat(0, "{}");
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}
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// the whole thing
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return "eval(" + $unpack + "(" + $params + "))\n";
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};
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// mmm.. ..which one do i need ??
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function _getEncoder($ascii) {
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return $ascii > 10 ? $ascii > 36 ? $ascii > 62 ? _encode95 : _encode62 : _encode36 : _encode10;
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};
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// zero encoding
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// characters: 0123456789
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var _encode10 = function($charCode) {
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return $charCode;
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};
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// inherent base36 support
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// characters: 0123456789abcdefghijklmnopqrstuvwxyz
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var _encode36 = function($charCode) {
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return $charCode.toString(36);
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};
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// hitch a ride on base36 and add the upper case alpha characters
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// characters: 0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ
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var _encode62 = function($charCode) {
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return ($charCode < _encoding ? '' : arguments.callee(parseInt($charCode / _encoding))) +
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(($charCode = $charCode % _encoding) > 35 ? String.fromCharCode($charCode + 29) : $charCode.toString(36));
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};
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// use high-ascii values
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var _encode95 = function($charCode) {
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return ($charCode < _encoding ? '' : arguments.callee($charCode / _encoding)) +
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String.fromCharCode($charCode % _encoding + 161);
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};
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// special _chars
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var _encodePrivate = function($charCode) {
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return "_" + $charCode;
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};
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// protect characters used by the parser
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function _escape($script) {
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return $script.replace(/([\\'])/g, "\\$1");
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};
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// protect high-ascii characters already in the script
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function _escape95($script) {
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return $script.replace(/[\xa1-\xff]/g, function($match) {
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return "\\x" + $match.charCodeAt(0).toString(16);
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});
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};
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function _safeRegExp($string, $flags) {
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return new RegExp($string.replace(/\$/g, "\\$"), $flags);
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};
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// extract the body of a function
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function _getFunctionBody($function) {
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with (String($function)) return slice(indexOf("{") + 1, lastIndexOf("}"));
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};
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// set the global flag on a RegExp (you have to create a new one)
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function _globalize($regexp) {
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return new RegExp(String($regexp).slice(1, -1), "g");
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};
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// build the parsing routine
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_addParser(_basicCompression);
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if (_specialChars) _addParser(_encodeSpecialChars);
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if (_encoding) _addParser(_encodeKeywords);
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// go!
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return _pack(_script);
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};
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