/usr/share/zabbix/include/classes/class.cjson.php is in zabbix-frontend-php 1:1.8.11-1.
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/*
** ZABBIX
** Copyright (C) 2000-2009 SIA Zabbix
**
** This program is free software; you can redistribute it and/or modify
** it under the terms of the GNU General Public License as published by
** the Free Software Foundation; either version 2 of the License, or
** (at your option) any later version.
**
** This program 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 General Public License for more details.
**
** You should have received a copy of the GNU General Public License
** along with this program; if not, write to the Free Software
** Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
**/
?>
<?php
/**
** Class for wrapping JSON encoding/decoding functionality.
**
** @ MOD from package Solar_Json <solarphp.com>
**
** @author Michal Migurski <mike-json@teczno.com>
** @author Matt Knapp <mdknapp[at]gmail[dot]com>
** @author Brett Stimmerman <brettstimmerman[at]gmail[dot]com>
** @author Clay Loveless <clay@killersoft.com>
** @modified by Artem Suharev <aly@zabbix.com>
**
** @license http://opensource.org/licenses/bsd-license.php BSD
**/
class CJSON{
/**
*
* User-defined configuration, primarily of use in unit testing.
*
* Keys are ...
*
* `bypass_ext`
* : (bool) Flag to instruct Solar_Json to bypass
* native json extension, ifinstalled.
*
* `bypass_mb`
* : (bool) Flag to instruct Solar_Json to bypass
* native mb_convert_encoding() function, if
* installed.
*
* `noerror`
* : (bool) Flag to instruct Solar_Json to return null
* for values it cannot encode rather than throwing
* an exceptions (PHP-only encoding) or PHP warnings
* (native json_encode() function).
*
* @var array
*
*/
protected $_config = array(
'bypass_ext' => false,
'bypass_mb' => false,
'noerror' => false
);
/**
*
* Marker constants for use in _json_decode()
*
* @constant
*
*/
const SLICE = 1;
const IN_STR = 2;
const IN_ARR = 3;
const IN_OBJ = 4;
const IN_CMT = 5;
/**
*
* Nest level counter for determining correct behavior of decoding string
* representations of numbers and boolean values.
*
* @var int
*/
protected $_level;
/**
*
* Constructor.
*
* ifthe $config param is an array, it is merged with the class
* config array and any values from the Solar.config.php file.
*
* The Solar.config.php values are inherited along class parent
* lines; for example, all classes descending from Solar_Base use the
* Solar_Base config file values until overridden.
*
* @param mixed $config User-defined configuration values.
*
*/
public function __construct($config = null){
$this->_mapAscii();
$this->_setStateTransitionTable();
}
/**
*
* Default destructor; does nothing other than provide a safe fallback
* for calls to parent::__destruct().
*
* @return void
*
*/
public function __destruct(){
}
/**
*
* Encodes the mixed $valueToEncode into JSON format.
*
* @param mixed $valueToEncode Value to be encoded into JSON format
*
* @param array $deQuote Array of keys whose values should **not** be
* quoted in encoded string.
*
* @return string JSON encoded value
*
*/
public function encode($valueToEncode, $deQuote = array()){
mb_internal_encoding('ASCII');
if(!$this->_config['bypass_ext'] && function_exists('json_encode')){
if($this->_config['noerror']){
$old_errlevel = error_reporting(E_ERROR ^ E_WARNING);
}
$encoded = json_encode($valueToEncode);
if($this->_config['noerror']){
error_reporting($old_errlevel);
}
}
else {
// Fall back to PHP-only method
$encoded = $this->_json_encode($valueToEncode);
}
// Sometimes you just don't want some values quoted
if(!empty($deQuote)){
$encoded = $this->_deQuote($encoded, $deQuote);
}
mb_internal_encoding('UTF-8');
return $encoded;
}
/**
*
* Accepts a JSON-encoded string, and removes quotes around values of
* keys specified in the $keys array.
*
* Sometimes, such as when constructing behaviors on the fly for "onSuccess"
* handlers to an Ajax request, the value needs to **not** have quotes around
* it. This method will remove those quotes and perform stripslashes on any
* escaped quotes within the quoted value.
*
* @param string $encoded JSON-encoded string
*
* @param array $keys Array of keys whose values should be de-quoted
*
* @return string $encoded Cleaned string
*
*/
protected function _deQuote($encoded, $keys){
foreach($keys as $key){
$pattern = "/(\"".$key."\"\:)(\".*(?:[^\\\]\"))/U";
$encoded = preg_replace_callback(
$pattern,
array($this, '_stripvalueslashes'),
$encoded
);
}
return $encoded;
}
/**
*
* Method for use with preg_replace_callback in the _deQuote() method.
*
* Returns \["keymatch":\]\[value\] where value has had its leading and
* trailing double-quotes removed, and stripslashes() run on the rest of
* the value.
*
* @param array $matches Regexp matches
*
* @return string replacement string
*
*/
protected function _stripvalueslashes($matches){
return $matches[1].stripslashes(substr($matches[2], 1, -1));
}
/**
*
* Decodes the $encodedValue string which is encoded in the JSON format.
*
* For compatibility with the native json_decode() function, this static
* method accepts the $encodedValue string and an optional boolean value
* $asArray which indicates whether or not the decoded value should be
* returned as an array. The default is false, meaning the default return
* from this method is an object.
*
* For compliance with the [JSON specification][], no attempt is made to
* decode strings that are obviously not an encoded arrays or objects.
*
* [JSON specification]: http://www.ietf.org/rfc/rfc4627.txt
*
* @param string $encodedValue String encoded in JSON format
*
* @param bool $asArray Optional argument to decode as an array.
* Default false.
*
* @return mixed decoded value
*
*/
public function decode($encodedValue, $asArray = false){
$first_char = substr(ltrim($encodedValue), 0, 1);
if($first_char != '{' && $first_char != '['){
return null;
}
if(!$this->_config['bypass_ext'] && function_exists('json_decode')){
return json_decode($encodedValue, (bool) $asArray);
}
// Fall back to PHP-only method
ini_set('pcre.backtrack_limit', '10000000');
$this->_level = 0;
$result = null;
// Required for internal parser, it operates with ASCII data
mb_internal_encoding('ASCII');
if($this->isValid($encodedValue)){
$result = $this->_json_decode($encodedValue, (bool) $asArray);
}
mb_internal_encoding('UTF-8');
return $result;
}
/**
*
* Encodes the mixed $valueToEncode into the JSON format, without use of
* native PHP json extension.
*
* @param mixed $var Any number, boolean, string, array, or object
* to be encoded. Strings are expected to be in ASCII or UTF-8 format.
*
* @return mixed JSON string representation of input value
*
*/
protected function _json_encode($var){
switch(gettype($var)){
case 'boolean':
return $var ? 'true' : 'false';
case 'NULL':
return 'null';
case 'integer':
// BREAK WITH Services_JSON:
// disabled for compatibility with ext/json. ext/json returns
// a string for integers, so we will to.
//return (int) $var;
return (string) $var;
case 'double':
case 'float':
// BREAK WITH Services_JSON:
// disabled for compatibility with ext/json. ext/json returns
// a string for floats and doubles, so we will to.
//return (float) $var;
return (string) $var;
case 'string':
// STRINGS ARE EXPECTED TO BE IN ASCII OR UTF-8 FORMAT
$ascii = '';
$strlen_var = zbx_strlen($var);
/**
* Iterate over every character in the string,
* escaping with a slash or encoding to UTF-8 where necessary
*/
for($c = 0; $c < $strlen_var; ++$c){
$ord_var_c = ord($var{$c});
switch(true){
case $ord_var_c == 0x08:
$ascii .= '\b';
break;
case $ord_var_c == 0x09:
$ascii .= '\t';
break;
case $ord_var_c == 0x0A:
$ascii .= '\n';
break;
case $ord_var_c == 0x0C:
$ascii .= '\f';
break;
case $ord_var_c == 0x0D:
$ascii .= '\r';
break;
case $ord_var_c == 0x22:
case $ord_var_c == 0x2F:
case $ord_var_c == 0x5C:
// double quote, slash, slosh
$ascii .= '\\'.$var{$c};
break;
case (($ord_var_c >= 0x20) && ($ord_var_c <= 0x7F)):
// characters U-00000000 - U-0000007F (same as ASCII)
$ascii .= $var{$c};
break;
case (($ord_var_c & 0xE0) == 0xC0):
// characters U-00000080 - U-000007FF, mask 110XXXXX
// see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
$char = pack('C*', $ord_var_c, ord($var{$c + 1}));
$c += 1;
$utf16 = $this->_utf82utf16($char);
$ascii .= sprintf('\u%04s', bin2hex($utf16));
break;
case (($ord_var_c & 0xF0) == 0xE0):
// characters U-00000800 - U-0000FFFF, mask 1110XXXX
// see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
$char = pack('C*', $ord_var_c,
ord($var{$c + 1}),
ord($var{$c + 2}));
$c += 2;
$utf16 = $this->_utf82utf16($char);
$ascii .= sprintf('\u%04s', bin2hex($utf16));
break;
case (($ord_var_c & 0xF8) == 0xF0):
// characters U-00010000 - U-001FFFFF, mask 11110XXX
// see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
$char = pack('C*', $ord_var_c,
ord($var{$c + 1}),
ord($var{$c + 2}),
ord($var{$c + 3}));
$c += 3;
$utf16 = $this->_utf82utf16($char);
$ascii .= sprintf('\u%04s', bin2hex($utf16));
break;
case (($ord_var_c & 0xFC) == 0xF8):
// characters U-00200000 - U-03FFFFFF, mask 111110XX
// see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
$char = pack('C*', $ord_var_c,
ord($var{$c + 1}),
ord($var{$c + 2}),
ord($var{$c + 3}),
ord($var{$c + 4}));
$c += 4;
$utf16 = $this->_utf82utf16($char);
$ascii .= sprintf('\u%04s', bin2hex($utf16));
break;
case (($ord_var_c & 0xFE) == 0xFC):
// characters U-04000000 - U-7FFFFFFF, mask 1111110X
// see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
$char = pack('C*', $ord_var_c,
ord($var{$c + 1}),
ord($var{$c + 2}),
ord($var{$c + 3}),
ord($var{$c + 4}),
ord($var{$c + 5}));
$c += 5;
$utf16 = $this->_utf82utf16($char);
$ascii .= sprintf('\u%04s', bin2hex($utf16));
break;
}
}
return '"'.$ascii.'"';
case 'array':
/**
*
* As per JSON spec ifany array key is not an integer
* we must treat the the whole array as an object. We
* also try to catch a sparsely populated associative
* array with numeric keys here because some JS engines
* will create an array with empty indexes up to
* max_index which can cause memory issues and because
* the keys, which may be relevant, will be remapped
* otherwise.
*
* As per the ECMA and JSON specification an object may
* have any string as a property. Unfortunately due to
* a hole in the ECMA specification ifthe key is a
* ECMA reserved word or starts with a digit the
* parameter is only accessible using ECMAScript's
* bracket notation.
*
*/
// treat as a JSON object
if(is_array($var) && count($var) &&
(array_keys($var) !== range(0, sizeof($var) - 1))){
$properties = array_map(array($this, '_name_value'),
array_keys($var),
array_values($var));
return '{' . join(',', $properties) . '}';
}
// treat it like a regular array
$elements = array_map(array($this, '_json_encode'), $var);
return '[' . join(',', $elements) . ']';
case 'object':
$vars = get_object_vars($var);
$properties = array_map(array($this, '_name_value'),
array_keys($vars),
array_values($vars));
return '{' . join(',', $properties) . '}';
default:
if($this->_config['noerror']){
return 'null';
}
throw Solar::exception(
'Solar_Json',
'ERR_CANNOT_ENCODE',
gettype($var) . ' cannot be encoded as a JSON string',
array('var' => $var)
);
}
}
/**
*
* Decodes a JSON string into appropriate variable.
*
* Note: several changes were made in translating this method from
* Services_JSON, particularly related to how strings are handled. According
* to JSON_checker test suite from <http://www.json.org/JSON_checker/>,
* a JSON payload should be an object or an array, not a string.
*
* Therefore, returning bool(true) for 'true' is invalid JSON decoding
* behavior, unless nested inside of an array or object.
*
* Similarly, a string of '1' should return null, not int(1), unless
* nested inside of an array or object.
*
* @param string $str String encoded in JSON format
*
* @param bool $asArray Optional argument to decode as an array.
*
* @return mixed decoded value
*
* @todo Rewrite this based off of method used in Solar_Json_Checker
*
*/
protected function _json_decode($str, $asArray = false){
$str = $this->_reduce_string($str);
switch (zbx_strtolower($str)){
case 'true':
// JSON_checker test suite claims
// "A JSON payload should be an object or array, not a string."
// Thus, returning bool(true) is invalid parsing, unless
// we're nested inside an array or object.
if(in_array($this->_level, array(self::IN_ARR, self::IN_OBJ))){
return true;
}
else {
return null;
}
break;
case 'false':
// JSON_checker test suite claims
// "A JSON payload should be an object or array, not a string."
// Thus, returning bool(false) is invalid parsing, unless
// we're nested inside an array or object.
if(in_array($this->_level, array(self::IN_ARR, self::IN_OBJ))){
return false;
}
else {
return null;
}
break;
case 'null':
return null;
default:
$m = array();
if(is_numeric($str) || ctype_digit($str) || ctype_xdigit($str)){
// Return float or int, or null as appropriate
if(in_array($this->_level, array(self::IN_ARR, self::IN_OBJ))){
return ((float) $str == (integer) $str)
? (integer) $str
: (float) $str;
}
else {
return null;
}
break;
}
else if(preg_match('/^("|\').*(\1)$/s', $str, $m)
&& $m[1] == $m[2]){
// STRINGS RETURNED IN UTF-8 FORMAT
$delim = substr($str, 0, 1);
$chrs = substr($str, 1, -1);
$utf8 = '';
$strlen_chrs = zbx_strlen($chrs);
for ($c = 0; $c < $strlen_chrs; ++$c){
$substr_chrs_c_2 = substr($chrs, $c, 2);
$ord_chrs_c = ord($chrs{$c});
switch(true){
case $substr_chrs_c_2 == '\b':
$utf8 .= chr(0x08);
++$c;
break;
case $substr_chrs_c_2 == '\t':
$utf8 .= chr(0x09);
++$c;
break;
case $substr_chrs_c_2 == '\n':
$utf8 .= chr(0x0A);
++$c;
break;
case $substr_chrs_c_2 == '\f':
$utf8 .= chr(0x0C);
++$c;
break;
case $substr_chrs_c_2 == '\r':
$utf8 .= chr(0x0D);
++$c;
break;
case $substr_chrs_c_2 == '\\"':
case $substr_chrs_c_2 == '\\\'':
case $substr_chrs_c_2 == '\\\\':
case $substr_chrs_c_2 == '\\/':
if(($delim == '"' && $substr_chrs_c_2 != '\\\'') ||
($delim == "'" && $substr_chrs_c_2 != '\\"')){
$utf8 .= $chrs{++$c};
}
break;
case preg_match('/\\\u[0-9A-F]{4}/i', substr($chrs, $c, 6)):
// single, escaped unicode character
$utf16 = chr(hexdec(substr($chrs, ($c + 2), 2)))
. chr(hexdec(substr($chrs, ($c + 4), 2)));
$utf8 .= $this->_utf162utf8($utf16);
$c += 5;
break;
case ($ord_chrs_c >= 0x20) && ($ord_chrs_c <= 0x7F):
$utf8 .= $chrs{$c};
break;
case ($ord_chrs_c & 0xE0) == 0xC0:
// characters U-00000080 - U-000007FF, mask 110XXXXX
//see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
$utf8 .= substr($chrs, $c, 2);
++$c;
break;
case ($ord_chrs_c & 0xF0) == 0xE0:
// characters U-00000800 - U-0000FFFF, mask 1110XXXX
// see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
$utf8 .= substr($chrs, $c, 3);
$c += 2;
break;
case ($ord_chrs_c & 0xF8) == 0xF0:
// characters U-00010000 - U-001FFFFF, mask 11110XXX
// see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
$utf8 .= substr($chrs, $c, 4);
$c += 3;
break;
case ($ord_chrs_c & 0xFC) == 0xF8:
// characters U-00200000 - U-03FFFFFF, mask 111110XX
// see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
$utf8 .= substr($chrs, $c, 5);
$c += 4;
break;
case ($ord_chrs_c & 0xFE) == 0xFC:
// characters U-04000000 - U-7FFFFFFF, mask 1111110X
// see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
$utf8 .= substr($chrs, $c, 6);
$c += 5;
break;
}
}
if(in_array($this->_level, array(self::IN_ARR, self::IN_OBJ))){
return $utf8;
}
else {
return null;
}
} else if(preg_match('/^\[.*\]$/s', $str) || preg_match('/^\{.*\}$/s', $str)){
// array, or object notation
if($str{0} == '['){
$stk = array(self::IN_ARR);
$this->_level = self::IN_ARR;
$arr = array();
}
else {
if($asArray){
$stk = array(self::IN_OBJ);
$obj = array();
}
else {
$stk = array(self::IN_OBJ);
$obj = new stdClass();
}
$this->_level = self::IN_OBJ;
}
array_push($stk, array('what' => self::SLICE,
'where' => 0,
'delim' => false));
$chrs = substr($str, 1, -1);
$chrs = $this->_reduce_string($chrs);
if($chrs == ''){
if(reset($stk) == self::IN_ARR){
return $arr;
}
else {
return $obj;
}
}
$strlen_chrs = zbx_strlen($chrs);
for ($c = 0; $c <= $strlen_chrs; ++$c){
$top = end($stk);
$substr_chrs_c_2 = substr($chrs, $c, 2);
if(($c == $strlen_chrs) || (($chrs{$c} == ',') && ($top['what'] == self::SLICE))){
// found a comma that is not inside a string, array, etc.,
// OR we've reached the end of the character list
$slice = substr($chrs, $top['where'], ($c - $top['where']));
array_push($stk, array('what' => self::SLICE, 'where' => ($c + 1), 'delim' => false));
//print("Found split at {$c}: ".substr($chrs, $top['where'], (1 + $c - $top['where']))."\n");
if(reset($stk) == self::IN_ARR){
$this->_level = self::IN_ARR;
// we are in an array, so just push an element onto the stack
array_push($arr, $this->_json_decode($slice, $asArray));
}
else if(reset($stk) == self::IN_OBJ){
$this->_level = self::IN_OBJ;
// we are in an object, so figure
// out the property name and set an
// element in an associative array,
// for now
$parts = array();
if(preg_match('/^\s*(["\'].*[^\\\]["\'])\s*:\s*(\S.*),?$/Uis', $slice, $parts)){
// "name":value pair
$key = $this->_json_decode($parts[1],$asArray);
$val = $this->_json_decode($parts[2],$asArray);
if($asArray){
$obj[$key] = $val;
}
else {
$obj->$key = $val;
}
}
else if(preg_match('/^\s*(\w+)\s*:\s*(\S.*),?$/Uis', $slice, $parts)){
// name:value pair, where name is unquoted
$key = $parts[1];
$val = $this->_json_decode($parts[2],$asArray);
if($asArray){
$obj[$key] = $val;
}
else {
$obj->$key = $val;
}
}
else if(preg_match('/^\s*(["\']["\'])\s*:\s*(\S.*),?$/Uis', $slice, $parts)){
// "":value pair
//$key = $this->_json_decode($parts[1]);
// use string that matches ext/json
$key = '_empty_';
$val = $this->_json_decode($parts[2],$asArray);
if($asArray){
$obj[$key] = $val;
}
else {
$obj->$key = $val;
}
}
}
}
else if((($chrs{$c} == '"') || ($chrs{$c} == "'")) && ($top['what'] != self::IN_STR)){
// found a quote, and we are not inside a string
array_push($stk, array('what' => self::IN_STR, 'where' => $c, 'delim' => $chrs{$c}));
//print("Found start of string at {$c}\n");
}
else if(($chrs{$c} == $top['delim']) &&
($top['what'] == self::IN_STR) &&
((zbx_strlen(substr($chrs, 0, $c)) - zbx_strlen(rtrim(substr($chrs, 0, $c), '\\'))) % 2 != 1)){
// found a quote, we're in a string, and it's not escaped
// we know that it's not escaped becase there is _not_ an
// odd number of backslashes at the end of the string so far
array_pop($stk);
//print("Found end of string at {$c}: ".substr($chrs, $top['where'], (1 + 1 + $c - $top['where']))."\n");
}
else if(($chrs{$c} == '[') &&
in_array($top['what'], array(self::SLICE, self::IN_ARR, self::IN_OBJ))){
// found a left-bracket, and we are in an array, object, or slice
array_push($stk, array('what' => self::IN_ARR, 'where' => $c, 'delim' => false));
//print("Found start of array at {$c}\n");
}
else if(($chrs{$c} == ']') && ($top['what'] == self::IN_ARR)){
// found a right-bracket, and we're in an array
$this->_level = null;
array_pop($stk);
//print("Found end of array at {$c}: ".substr($chrs, $top['where'], (1 + $c - $top['where']))."\n");
}
else if(($chrs{$c} == '{') &&
in_array($top['what'], array(self::SLICE, self::IN_ARR, self::IN_OBJ))){
// found a left-brace, and we are in an array, object, or slice
array_push($stk, array('what' => self::IN_OBJ, 'where' => $c, 'delim' => false));
//print("Found start of object at {$c}\n");
}
else if(($chrs{$c} == '}') && ($top['what'] == self::IN_OBJ)){
// found a right-brace, and we're in an object
$this->_level = null;
array_pop($stk);
//print("Found end of object at {$c}: ".substr($chrs, $top['where'], (1 + $c - $top['where']))."\n");
}
else if(($substr_chrs_c_2 == '/*') &&
in_array($top['what'], array(self::SLICE, self::IN_ARR, self::IN_OBJ))){
// found a comment start, and we are in an array, object, or slice
array_push($stk, array('what' => self::IN_CMT, 'where' => $c, 'delim' => false));
$c++;
//print("Found start of comment at {$c}\n");
}
else if(($substr_chrs_c_2 == '*/') && ($top['what'] == self::IN_CMT)){
// found a comment end, and we're in one now
array_pop($stk);
$c++;
for ($i = $top['where']; $i <= $c; ++$i)
$chrs = substr_replace($chrs, ' ', $i, 1);
//print("Found end of comment at {$c}: ".substr($chrs, $top['where'], (1 + $c - $top['where']))."\n");
}
}
if(reset($stk) == self::IN_ARR){
return $arr;
}
else if(reset($stk) == self::IN_OBJ){
return $obj;
}
}
}
}
/**
*
* Array-walking method for use in generating JSON-formatted name-value
* pairs in the form of '"name":value'.
*
* @param string $name name of key to use
*
* @param mixed $value element to be encoded
*
* @return string JSON-formatted name-value pair
*
*/
protected function _name_value($name, $value){
$encoded_value = $this->_json_encode($value);
return $this->_json_encode(strval($name)) . ':' . $encoded_value;
}
/**
*
* Convert a string from one UTF-16 char to one UTF-8 char.
*
* Normally should be handled by mb_convert_encoding, but
* provides a slower PHP-only method for installations
* that lack the multibye string extension.
*
* @param string $utf16 UTF-16 character
*
* @return string UTF-8 character
*
*/
protected function _utf162utf8($utf16){
// oh please oh please oh please oh please oh please
if(!$this->_config['bypass_mb'] &&
function_exists('mb_convert_encoding')){
return mb_convert_encoding($utf16, 'UTF-8', 'UTF-16');
}
$bytes = (ord($utf16{0}) << 8) | ord($utf16{1});
switch (true){
case ((0x7F & $bytes) == $bytes):
// this case should never be reached, because we are in ASCII range
// see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
return chr(0x7F & $bytes);
case (0x07FF & $bytes) == $bytes:
// return a 2-byte UTF-8 character
// see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
return chr(0xC0 | (($bytes >> 6) & 0x1F))
. chr(0x80 | ($bytes & 0x3F));
case (0xFFFF & $bytes) == $bytes:
// return a 3-byte UTF-8 character
// see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
return chr(0xE0 | (($bytes >> 12) & 0x0F))
. chr(0x80 | (($bytes >> 6) & 0x3F))
. chr(0x80 | ($bytes & 0x3F));
}
// ignoring UTF-32 for now, sorry
return '';
}
/**
*
* Convert a string from one UTF-8 char to one UTF-16 char.
*
* Normally should be handled by mb_convert_encoding, but
* provides a slower PHP-only method for installations
* that lack the multibye string extension.
*
* @param string $utf8 UTF-8 character
*
* @return string UTF-16 character
*
*/
protected function _utf82utf16($utf8){
// oh please oh please oh please oh please oh please
if(!$this->_config['bypass_mb'] &&
function_exists('mb_convert_encoding')){
return mb_convert_encoding($utf8, 'UTF-16', 'UTF-8');
}
switch (zbx_strlen($utf8)){
case 1:
// this case should never be reached, because we are in ASCII range
// see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
return $utf8;
case 2:
// return a UTF-16 character from a 2-byte UTF-8 char
// see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
return chr(0x07 & (ord($utf8{0}) >> 2))
. chr((0xC0 & (ord($utf8{0}) << 6))
| (0x3F & ord($utf8{1})));
case 3:
// return a UTF-16 character from a 3-byte UTF-8 char
// see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
return chr((0xF0 & (ord($utf8{0}) << 4))
| (0x0F & (ord($utf8{1}) >> 2)))
. chr((0xC0 & (ord($utf8{1}) << 6))
| (0x7F & ord($utf8{2})));
}
// ignoring UTF-32 for now, sorry
return '';
}
/**
*
* Reduce a string by removing leading and trailing comments and whitespace.
*
* @param string $str string value to strip of comments and whitespace
*
* @return string string value stripped of comments and whitespace
*
*/
protected function _reduce_string($str){
$str = preg_replace(array(
// eliminate single line comments in '// ...' form
'#^\s*//(.+)$#m',
// eliminate multi-line comments in '/* ... */' form, at start of string
'#^\s*/\*(.+)\*/#Us',
// eliminate multi-line comments in '/* ... */' form, at end of string
'#/\*(.+)\*/\s*$#Us'
), '', $str);
// eliminate extraneous space
return trim($str);
}
protected function _exception($code, $info = array()){
$class = get_class($this);
SDI(array($class, $code, (array) $info));
}
//***************************************************************************
// CHECK JSON *
//***************************************************************************
const S_ERR = -1; // Error
const S_SPA = 0; // Space
const S_WSP = 1; // Other whitespace
const S_LBE = 2; // {
const S_RBE = 3; // }
const S_LBT = 4; // [
const S_RBT = 5; // ]
const S_COL = 6; // :
const S_COM = 7; // ,
const S_QUO = 8; // "
const S_BAC = 9; // \
const S_SLA = 10; // /
const S_PLU = 11; // +
const S_MIN = 12; // -
const S_DOT = 13; // .
const S_ZER = 14; // 0
const S_DIG = 15; // 123456789
const S__A_ = 16; // a
const S__B_ = 17; // b
const S__C_ = 18; // c
const S__D_ = 19; // d
const S__E_ = 20; // e
const S__F_ = 21; // f
const S__L_ = 22; // l
const S__N_ = 23; // n
const S__R_ = 24; // r
const S__S_ = 25; // s
const S__T_ = 26; // t
const S__U_ = 27; // u
const S_A_F = 28; // ABCDF
const S_E = 29; // E
const S_ETC = 30; // Everything else
/**
*
* Map of 128 ASCII characters into the 32 character classes.
*
* The remaining Unicode characters should be mapped to S_ETC.
*
* @var array
*
*/
protected $_ascii_class = array();
/**
*
* State transition table.
*
* @var array
*
*/
protected $_state_transition_table = array();
/**
*
* These modes can be pushed on the "pushdown automata" (PDA) stack.
*
* @constant
*
*/
const MODE_DONE = 1;
const MODE_KEY = 2;
const MODE_OBJECT = 3;
const MODE_ARRAY = 4;
/**
*
* Max depth allowed for nested structures.
*
* @constant
*
*/
const MAX_DEPTH = 20;
/**
*
* The stack to maintain the state of nested structures.
*
* @var array
*
*/
protected $_the_stack = array();
/**
*
* Pointer for the top of the stack.
*
* @var int
*
*/
protected $_the_top;
/**
*
* The isValid method takes a UTF-16 encoded string and determines ifit is
* a syntactically correct JSON text.
*
* It is implemented as a Pushdown Automaton; that means it is a finite
* state machine with a stack.
*
* @param string $str The JSON text to validate
*
* @return bool
*
*/
public function isValid($str){
// string length
$len = zbx_strlen($str);
// the next character
//$b = 0;
// the next character class
//$c = 0;
// the next state
//$s = 0;
$_the_state = 0;
$this->_the_top = -1;
$this->_push(self::MODE_DONE);
for($_the_index = 0; $_the_index < $len; $_the_index++){
$b = $str{$_the_index};
if(chr(ord($b) & 127) == $b){
$c = $this->_ascii_class[ord($b)];
if($c <= self::S_ERR){
return false;
}
}
else {
$c = self::S_ETC;
}
// Get the next state from the transition table
$s = $this->_state_transition_table[$_the_state][$c];
if($s < 0){
// Perform one of the predefined actions
switch($s){
// empty }
case -9:
if(!$this->_pop(self::MODE_KEY)){
return false;
}
$_the_state = 9;
break;
// {
case -8:
if(!$this->_push(self::MODE_KEY)){
return false;
}
$_the_state = 1;
break;
// }
case -7:
if(!$this->_pop(self::MODE_OBJECT)){
return false;
}
$_the_state = 9;
break;
// [
case -6:
if(!$this->_push(self::MODE_ARRAY)){
return false;
}
$_the_state = 2;
break;
// ]
case -5:
if(!$this->_pop(self::MODE_ARRAY)){
return false;
}
$_the_state = 9;
break;
// "
case -4:
switch($this->_the_stack[$this->_the_top]){
case self::MODE_KEY:
$_the_state = 27;
break;
case self::MODE_ARRAY:
case self::MODE_OBJECT:
$_the_state = 9;
break;
default:
return false;
}
break;
// '
case -3:
switch($this->_the_stack[$this->_the_top]){
case self::MODE_OBJECT:
if($this->_pop(self::MODE_OBJECT) && $this->_push(self::MODE_KEY)){
$_the_state = 29;
}
break;
case self::MODE_ARRAY:
$_the_state = 28;
break;
default:
return false;
}
break;
// :
case -2:
if($this->_pop(self::MODE_KEY) && $this->_push(self::MODE_OBJECT)){
$_the_state = 28;
break;
}
// syntax error
case -1:
return false;
}
}
else {
// change the state and iterate
$_the_state = $s;
}
}
if($_the_state == 9 && $this->_pop(self::MODE_DONE)){
return true;
}
return false;
}
/**
*
* Map the 128 ASCII characters into the 32 character classes.
* The remaining Unicode characters should be mapped to S_ETC.
*
* @return void
*
*/
protected function _mapAscii(){
$this->_ascii_class = array(
self::S_ERR, self::S_ERR, self::S_ERR, self::S_ERR, self::S_ERR, self::S_ERR, self::S_ERR, self::S_ERR,
self::S_ERR, self::S_WSP, self::S_WSP, self::S_ERR, self::S_ERR, self::S_WSP, self::S_ERR, self::S_ERR,
self::S_ERR, self::S_ERR, self::S_ERR, self::S_ERR, self::S_ERR, self::S_ERR, self::S_ERR, self::S_ERR,
self::S_ERR, self::S_ERR, self::S_ERR, self::S_ERR, self::S_ERR, self::S_ERR, self::S_ERR, self::S_ERR,
self::S_SPA, self::S_ETC, self::S_QUO, self::S_ETC, self::S_ETC, self::S_ETC, self::S_ETC, self::S_ETC,
self::S_ETC, self::S_ETC, self::S_ETC, self::S_PLU, self::S_COM, self::S_MIN, self::S_DOT, self::S_SLA,
self::S_ZER, self::S_DIG, self::S_DIG, self::S_DIG, self::S_DIG, self::S_DIG, self::S_DIG, self::S_DIG,
self::S_DIG, self::S_DIG, self::S_COL, self::S_ETC, self::S_ETC, self::S_ETC, self::S_ETC, self::S_ETC,
self::S_ETC, self::S_A_F, self::S_A_F, self::S_A_F, self::S_A_F, self::S_E , self::S_A_F, self::S_ETC,
self::S_ETC, self::S_ETC, self::S_ETC, self::S_ETC, self::S_ETC, self::S_ETC, self::S_ETC, self::S_ETC,
self::S_ETC, self::S_ETC, self::S_ETC, self::S_ETC, self::S_ETC, self::S_ETC, self::S_ETC, self::S_ETC,
self::S_ETC, self::S_ETC, self::S_ETC, self::S_LBT, self::S_BAC, self::S_RBT, self::S_ETC, self::S_ETC,
self::S_ETC, self::S__A_, self::S__B_, self::S__C_, self::S__D_, self::S__E_, self::S__F_, self::S_ETC,
self::S_ETC, self::S_ETC, self::S_ETC, self::S_ETC, self::S__L_, self::S_ETC, self::S__N_, self::S_ETC,
self::S_ETC, self::S_ETC, self::S__R_, self::S__S_, self::S__T_, self::S__U_, self::S_ETC, self::S_ETC,
self::S_ETC, self::S_ETC, self::S_ETC, self::S_LBE, self::S_ETC, self::S_RBE, self::S_ETC, self::S_ETC
);
}
/**
*
* The state transition table takes the current state and the current symbol,
* and returns either a new state or an action. A new state is a number between
* 0 and 29. An action is a negative number between -1 and -9. A JSON text is
* accepted ifthe end of the text is in state 9 and mode is MODE_DONE.
*
* @return void;
*
*/
protected function _setStateTransitionTable(){
$this->_state_transition_table = array(
array( 0, 0,-8,-1,-6,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1),
array( 1, 1,-1,-9,-1,-1,-1,-1, 3,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1),
array( 2, 2,-8,-1,-6,-5,-1,-1, 3,-1,-1,-1,20,-1,21,22,-1,-1,-1,-1,-1,13,-1,17,-1,-1,10,-1,-1,-1,-1),
array( 3,-1, 3, 3, 3, 3, 3, 3,-4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3),
array(-1,-1,-1,-1,-1,-1,-1,-1, 3, 3, 3,-1,-1,-1,-1,-1,-1, 3,-1,-1,-1, 3,-1, 3, 3,-1, 3, 5,-1,-1,-1),
array(-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, 6, 6, 6, 6, 6, 6, 6, 6,-1,-1,-1,-1,-1,-1, 6, 6,-1),
array(-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, 7, 7, 7, 7, 7, 7, 7, 7,-1,-1,-1,-1,-1,-1, 7, 7,-1),
array(-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, 8, 8, 8, 8, 8, 8, 8, 8,-1,-1,-1,-1,-1,-1, 8, 8,-1),
array(-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, 3, 3, 3, 3, 3, 3, 3, 3,-1,-1,-1,-1,-1,-1, 3, 3,-1),
array( 9, 9,-1,-7,-1,-5,-1,-3,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1),
array(-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,11,-1,-1,-1,-1,-1,-1),
array(-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,12,-1,-1,-1),
array(-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, 9,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1),
array(-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,14,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1),
array(-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,15,-1,-1,-1,-1,-1,-1,-1,-1),
array(-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,16,-1,-1,-1,-1,-1),
array(-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, 9,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1),
array(-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,18,-1,-1,-1),
array(-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,19,-1,-1,-1,-1,-1,-1,-1,-1),
array(-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, 9,-1,-1,-1,-1,-1,-1,-1,-1),
array(-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,21,22,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1),
array( 9, 9,-1,-7,-1,-5,-1,-3,-1,-1,-1,-1,-1,23,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1),
array( 9, 9,-1,-7,-1,-5,-1,-3,-1,-1,-1,-1,-1,23,22,22,-1,-1,-1,-1,24,-1,-1,-1,-1,-1,-1,-1,-1,24,-1),
array( 9, 9,-1,-7,-1,-5,-1,-3,-1,-1,-1,-1,-1,-1,23,23,-1,-1,-1,-1,24,-1,-1,-1,-1,-1,-1,-1,-1,24,-1),
array(-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,25,25,-1,26,26,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1),
array(-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,26,26,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1),
array( 9, 9,-1,-7,-1,-5,-1,-3,-1,-1,-1,-1,-1,-1,26,26,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1),
array(27,27,-1,-1,-1,-1,-2,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1),
array(28,28,-8,-1,-6,-1,-1,-1, 3,-1,-1,-1,20,-1,21,22,-1,-1,-1,-1,-1,13,-1,17,-1,-1,10,-1,-1,-1,-1),
array(29,29,-1,-1,-1,-1,-1,-1, 3,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1)
);
}
/**
*
* Push a mode onto the stack. Return false ifthere is overflow.
*
* @param int $mode Mode to push onto the stack
*
* @return bool Success/failure of stack push
*
*/
protected function _push($mode){
$this->_the_top++;
if($this->_the_top >= self::MAX_DEPTH){
return false;
}
$this->_the_stack[$this->_the_top] = $mode;
return true;
}
/**
*
* Pop the stack, assuring that the current mode matches the expectation.
* Return false ifthere is underflow or ifthe modes mismatch.
*
* @param int $mode Mode to pop from the stack
*
* @return bool Success/failure of stack pop
*
*/
protected function _pop($mode){
if($this->_the_top < 0 || $this->_the_stack[$this->_the_top] != $mode){
return false;
}
$this->_the_stack[$this->_the_top] = 0;
$this->_the_top--;
return true;
}
}
?>
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