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-<?php
-
-/******************************************************************************
-*
-* Filename: Unicode.php
-*
-* Description: Provides functions for handling Unicode strings in PHP without
-* needing to configure the non-default mbstring extension
-*
-* Author: Evan Hunter
-*
-* Date: 27/7/2004
-*
-* Project: JPEG Metadata
-*
-* Revision: 1.10
-*
-* Changes: 1.00 -> 1.10 : Added the following functions:
-* smart_HTML_Entities
-* smart_htmlspecialchars
-* HTML_UTF16_UnEscape
-* HTML_UTF8_UnEscape
-* changed HTML_UTF8_Escape and HTML_UTF16_Escape to
-* use smart_htmlspecialchars, so that characters which
-* were already escaped would remain intact
-*
-*
-* URL: http://electronics.ozhiker.com
-*
-* License: This file is part of the PHP JPEG Metadata Toolkit.
-*
-* The PHP JPEG Metadata Toolkit 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.
-*
-* The PHP JPEG Metadata Toolkit 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 the PHP JPEG Metadata Toolkit; if not,
-* write to the Free Software Foundation, Inc., 59 Temple
-* Place, Suite 330, Boston, MA 02111-1307 USA
-*
-* If you require a different license for commercial or other
-* purposes, please contact the author: evan@ozhiker.com
-*
-******************************************************************************/
-
-
-// TODO: UTF-16 functions have not been tested fully
-
-
-
-/******************************************************************************
-*
-* Unicode UTF-8 Encoding Functions
-*
-* Description: UTF-8 is a Unicode encoding system in which extended characters
-* use only the upper half (128 values) of the byte range, thus it
-* allows the use of normal 7-bit ASCII text.
-* 7-Bit ASCII will pass straight through UTF-8 encoding/decoding without change
-*
-*
-* The encoding is as follows:
-* Unicode Value : Binary representation (x=data bit)
-*--------------------------------------------------------------------------------
-* U-00000000 - U-0000007F: 0xxxxxxx <- This is 7-bit ASCII
-* U-00000080 - U-000007FF: 110xxxxx 10xxxxxx
-* U-00000800 - U-0000FFFF: 1110xxxx 10xxxxxx 10xxxxxx
-* U-00010000 - U-001FFFFF: 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx
-* U-00200000 - U-03FFFFFF: 111110xx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx
-* U-04000000 - U-7FFFFFFF: 1111110x 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx
-*--------------------------------------------------------------------------------
-*
-******************************************************************************/
-
-
-
-
-/******************************************************************************
-*
-* Unicode UTF-16 Encoding Functions
-*
-* Description: UTF-16 is a Unicode encoding system uses 16 bit values for representing
-* characters.
-* It also has an extended set of characters available by the use
-* of surrogate pairs, which are a pair of 16 bit values, giving a
-* total data length of 20 useful bits.
-*
-*
-* The encoding is as follows:
-* Unicode Value : Binary representation (x=data bit)
-*--------------------------------------------------------------------------------
-* U-000000 - U-00D7FF: xxxxxxxx xxxxxxxx
-* U-00D800 - U-00DBFF: Not available - used for high surrogate pairs
-* U-00DC00 - U-00DFFF: Not available - used for low surrogate pairs
- U-00E000 - U-00FFFF: xxxxxxxx xxxxxxxx
-* U-010000 - U-10FFFF: 110110ww wwxxxxxx 110111xx xxxxxxxx ( wwww = (uni-0x10000)/0x10000 )
-*--------------------------------------------------------------------------------
-*
-* Surrogate pair Calculations
-*
-* $hi = ($uni - 0x10000) / 0x400 + 0xD800;
-* $lo = ($uni - 0x10000) % 0x400 + 0xDC00;
-*
-*
-* $uni = 0x10000 + ($hi - 0xD800) * 0x400 + ($lo - 0xDC00);
-*
-*
-******************************************************************************/
-
-
-
-
-
-
-/******************************************************************************
-*
-* Function: UTF8_fix
-*
-* Description: Checks a string for badly formed Unicode UTF-8 coding and
-* returns the same string containing only the parts which
-* were properly formed UTF-8 data.
-*
-* Parameters: utf8_text - a string with possibly badly formed UTF-8 data
-*
-* Returns: output - the well formed UTF-8 version of the string
-*
-******************************************************************************/
-
-function UTF8_fix( $utf8_text )
-{
- // Initialise the current position in the string
- $pos = 0;
-
- // Create a string to accept the well formed output
- $output = "" ;
-
- // Cycle through each group of bytes, ensuring the coding is correct
- while ( $pos < strlen( $utf8_text ) )
- {
- // Retreive the current numerical character value
- $chval = ord($utf8_text{$pos});
-
- // Check what the first character is - it will tell us how many bytes the
- // Unicode value covers
-
- if ( ( $chval >= 0x00 ) && ( $chval <= 0x7F ) )
- {
- // 1 Byte UTF-8 Unicode (7-Bit ASCII) Character
- $bytes = 1;
- }
- else if ( ( $chval >= 0xC0 ) && ( $chval <= 0xDF ) )
- {
- // 2 Byte UTF-8 Unicode Character
- $bytes = 2;
- }
- else if ( ( $chval >= 0xE0 ) && ( $chval <= 0xEF ) )
- {
- // 3 Byte UTF-8 Unicode Character
- $bytes = 3;
- }
- else if ( ( $chval >= 0xF0 ) && ( $chval <= 0xF7 ) )
- {
- // 4 Byte UTF-8 Unicode Character
- $bytes = 4;
- }
- else if ( ( $chval >= 0xF8 ) && ( $chval <= 0xFB ) )
- {
- // 5 Byte UTF-8 Unicode Character
- $bytes = 5;
- }
- else if ( ( $chval >= 0xFC ) && ( $chval <= 0xFD ) )
- {
- // 6 Byte UTF-8 Unicode Character
- $bytes = 6;
- }
- else
- {
- // Invalid Code - skip character and do nothing
- $bytes = 0;
- $pos++;
- }
-
-
- // check that there is enough data remaining to read
- if (($pos + $bytes - 1) < strlen( $utf8_text ) )
- {
- // Cycle through the number of bytes specified,
- // copying them to the output string
- while ( $bytes > 0 )
- {
- $output .= $utf8_text{$pos};
- $pos++;
- $bytes--;
- }
- }
- else
- {
- break;
- }
- }
-
- // Return the result
- return $output;
-}
-
-/******************************************************************************
-* End of Function: UTF8_fix
-******************************************************************************/
-
-
-
-
-
-
-
-
-
-/******************************************************************************
-*
-* Function: UTF16_fix
-*
-* Description: Checks a string for badly formed Unicode UTF-16 coding and
-* returns the same string containing only the parts which
-* were properly formed UTF-16 data.
-*
-* Parameters: utf16_text - a string with possibly badly formed UTF-16 data
-* MSB_first - True will cause processing as Big Endian UTF-16 (Motorola, MSB first)
-* False will cause processing as Little Endian UTF-16 (Intel, LSB first)
-*
-* Returns: output - the well formed UTF-16 version of the string
-*
-******************************************************************************/
-
-function UTF16_fix( $utf16_text, $MSB_first )
-{
- // Initialise the current position in the string
- $pos = 0;
-
- // Create a string to accept the well formed output
- $output = "" ;
-
- // Cycle through each group of bytes, ensuring the coding is correct
- while ( $pos < strlen( $utf16_text ) )
- {
- // Retreive the current numerical character value
- $chval1 = ord($utf16_text{$pos});
-
- // Skip over character just read
- $pos++;
-
- // Check if there is another character available
- if ( $pos < strlen( $utf16_text ) )
- {
- // Another character is available - get it for the second half of the UTF-16 value
- $chval2 = ord( $utf16_text{$pos} );
- }
- else
- {
- // Error - no second byte to this UTF-16 value - end processing
- continue 1;
- }
-
- // Skip over character just read
- $pos++;
-
- // Calculate the 16 bit unicode value
- if ( $MSB_first )
- {
- // Big Endian
- $UTF16_val = $chval1 * 0x100 + $chval2;
- }
- else
- {
- // Little Endian
- $UTF16_val = $chval2 * 0x100 + $chval1;
- }
-
-
-
- if ( ( ( $UTF16_val >= 0x0000 ) && ( $UTF16_val <= 0xD7FF ) ) ||
- ( ( $UTF16_val >= 0xE000 ) && ( $UTF16_val <= 0xFFFF ) ) )
- {
- // Normal Character (Non Surrogate pair)
- // Add it to the output
- $output .= chr( $chval1 ) . chr ( $chval2 );
- }
- else if ( ( $UTF16_val >= 0xD800 ) && ( $UTF16_val <= 0xDBFF ) )
- {
- // High surrogate of a surrogate pair
- // Now we need to read the low surrogate
- // Check if there is another 2 characters available
- if ( ( $pos + 3 ) < strlen( $utf16_text ) )
- {
- // Another 2 characters are available - get them
- $chval3 = ord( $utf16_text{$pos} );
- $chval4 = ord( $utf16_text{$pos+1} );
-
- // Calculate the second 16 bit unicode value
- if ( $MSB_first )
- {
- // Big Endian
- $UTF16_val2 = $chval3 * 0x100 + $chval4;
- }
- else
- {
- // Little Endian
- $UTF16_val2 = $chval4 * 0x100 + $chval3;
- }
-
- // Check that this is a low surrogate
- if ( ( $UTF16_val2 >= 0xDC00 ) && ( $UTF16_val2 <= 0xDFFF ) )
- {
- // Low surrogate found following high surrogate
- // Add both to the output
- $output .= chr( $chval1 ) . chr ( $chval2 ) . chr( $chval3 ) . chr ( $chval4 );
-
- // Skip over the low surrogate
- $pos += 2;
- }
- else
- {
- // Low surrogate not found after high surrogate
- // Don't add either to the output
- // Only the High surrogate is skipped and processing continues after it
- }
-
- }
- else
- {
- // Error - not enough data for low surrogate - end processing
- continue 1;
- }
-
- }
- else
- {
- // Low surrogate of a surrogate pair
- // This should not happen - it means this is a lone low surrogate
- // Dont add it to the output
- }
-
- }
-
- // Return the result
- return $output;
-}
-
-/******************************************************************************
-* End of Function: UTF16_fix
-******************************************************************************/
-
-
-
-
-
-/******************************************************************************
-*
-* Function: UTF8_to_unicode_array
-*
-* Description: Converts a string encoded with Unicode UTF-8, to an array of
-* numbers which represent unicode character numbers
-*
-* Parameters: utf8_text - a string containing the UTF-8 data
-*
-* Returns: output - the array containing the unicode character numbers
-*
-******************************************************************************/
-
-function UTF8_to_unicode_array( $utf8_text )
-{
- // Create an array to receive the unicode character numbers output
- $output = array( );
-
- // Cycle through the characters in the UTF-8 string
- for ( $pos = 0; $pos < strlen( $utf8_text ); $pos++ )
- {
- // Retreive the current numerical character value
- $chval = ord($utf8_text{$pos});
-
- // Check what the first character is - it will tell us how many bytes the
- // Unicode value covers
-
- if ( ( $chval >= 0x00 ) && ( $chval <= 0x7F ) )
- {
- // 1 Byte UTF-8 Unicode (7-Bit ASCII) Character
- $bytes = 1;
- $outputval = $chval; // Since 7-bit ASCII is unaffected, the output equals the input
- }
- else if ( ( $chval >= 0xC0 ) && ( $chval <= 0xDF ) )
- {
- // 2 Byte UTF-8 Unicode
- $bytes = 2;
- $outputval = $chval & 0x1F; // The first byte is bitwise ANDed with 0x1F to remove the leading 110b
- }
- else if ( ( $chval >= 0xE0 ) && ( $chval <= 0xEF ) )
- {
- // 3 Byte UTF-8 Unicode
- $bytes = 3;
- $outputval = $chval & 0x0F; // The first byte is bitwise ANDed with 0x0F to remove the leading 1110b
- }
- else if ( ( $chval >= 0xF0 ) && ( $chval <= 0xF7 ) )
- {
- // 4 Byte UTF-8 Unicode
- $bytes = 4;
- $outputval = $chval & 0x07; // The first byte is bitwise ANDed with 0x07 to remove the leading 11110b
- }
- else if ( ( $chval >= 0xF8 ) && ( $chval <= 0xFB ) )
- {
- // 5 Byte UTF-8 Unicode
- $bytes = 5;
- $outputval = $chval & 0x03; // The first byte is bitwise ANDed with 0x03 to remove the leading 111110b
- }
- else if ( ( $chval >= 0xFC ) && ( $chval <= 0xFD ) )
- {
- // 6 Byte UTF-8 Unicode
- $bytes = 6;
- $outputval = $chval & 0x01; // The first byte is bitwise ANDed with 0x01 to remove the leading 1111110b
- }
- else
- {
- // Invalid Code - do nothing
- $bytes = 0;
- }
-
- // Check if the byte was valid
- if ( $bytes !== 0 )
- {
- // The byte was valid
-
- // Check if there is enough data left in the UTF-8 string to allow the
- // retrieval of the remainder of this unicode character
- if ( $pos + $bytes - 1 < strlen( $utf8_text ) )
- {
- // The UTF-8 string is long enough
-
- // Cycle through the number of bytes required,
- // minus the first one which has already been done
- while ( $bytes > 1 )
- {
- $pos++;
- $bytes--;
-
- // Each remaining byte is coded with 6 bits of data and 10b on the high
- // order bits. Hence we need to shift left by 6 bits (0x40) then add the
- // current characer after it has been bitwise ANDed with 0x3F to remove the
- // highest two bits.
- $outputval = $outputval*0x40 + ( (ord($utf8_text{$pos})) & 0x3F );
- }
-
- // Add the calculated Unicode number to the output array
- $output[] = $outputval;
- }
- }
-
- }
-
- // Return the resulting array
- return $output;
-}
-
-/******************************************************************************
-* End of Function: UTF8_to_unicode_array
-******************************************************************************/
-
-
-
-
-
-/******************************************************************************
-*
-* Function: UTF16_to_unicode_array
-*
-* Description: Converts a string encoded with Unicode UTF-16, to an array of
-* numbers which represent unicode character numbers
-*
-* Parameters: utf16_text - a string containing the UTF-16 data
-* MSB_first - True will cause processing as Big Endian UTF-16 (Motorola, MSB first)
-* False will cause processing as Little Endian UTF-16 (Intel, LSB first)
-*
-* Returns: output - the array containing the unicode character numbers
-*
-******************************************************************************/
-
-function UTF16_to_unicode_array( $utf16_text, $MSB_first )
-{
- // Create an array to receive the unicode character numbers output
- $output = array( );
-
-
- // Initialise the current position in the string
- $pos = 0;
-
- // Cycle through each group of bytes, ensuring the coding is correct
- while ( $pos < strlen( $utf16_text ) )
- {
- // Retreive the current numerical character value
- $chval1 = ord($utf16_text{$pos});
-
- // Skip over character just read
- $pos++;
-
- // Check if there is another character available
- if ( $pos < strlen( $utf16_text ) )
- {
- // Another character is available - get it for the second half of the UTF-16 value
- $chval2 = ord( $utf16_text{$pos} );
- }
- else
- {
- // Error - no second byte to this UTF-16 value - end processing
- continue 1;
- }
-
- // Skip over character just read
- $pos++;
-
- // Calculate the 16 bit unicode value
- if ( $MSB_first )
- {
- // Big Endian
- $UTF16_val = $chval1 * 0x100 + $chval2;
- }
- else
- {
- // Little Endian
- $UTF16_val = $chval2 * 0x100 + $chval1;
- }
-
-
- if ( ( ( $UTF16_val >= 0x0000 ) && ( $UTF16_val <= 0xD7FF ) ) ||
- ( ( $UTF16_val >= 0xE000 ) && ( $UTF16_val <= 0xFFFF ) ) )
- {
- // Normal Character (Non Surrogate pair)
- // Add it to the output
- $output[] = $UTF16_val;
- }
- else if ( ( $UTF16_val >= 0xD800 ) && ( $UTF16_val <= 0xDBFF ) )
- {
- // High surrogate of a surrogate pair
- // Now we need to read the low surrogate
- // Check if there is another 2 characters available
- if ( ( $pos + 3 ) < strlen( $utf16_text ) )
- {
- // Another 2 characters are available - get them
- $chval3 = ord( $utf16_text{$pos} );
- $chval4 = ord( $utf16_text{$pos+1} );
-
- // Calculate the second 16 bit unicode value
- if ( $MSB_first )
- {
- // Big Endian
- $UTF16_val2 = $chval3 * 0x100 + $chval4;
- }
- else
- {
- // Little Endian
- $UTF16_val2 = $chval4 * 0x100 + $chval3;
- }
-
- // Check that this is a low surrogate
- if ( ( $UTF16_val2 >= 0xDC00 ) && ( $UTF16_val2 <= 0xDFFF ) )
- {
- // Low surrogate found following high surrogate
- // Add both to the output
- $output[] = 0x10000 + ( ( $UTF16_val - 0xD800 ) * 0x400 ) + ( $UTF16_val2 - 0xDC00 );
-
- // Skip over the low surrogate
- $pos += 2;
- }
- else
- {
- // Low surrogate not found after high surrogate
- // Don't add either to the output
- // The high surrogate is skipped and processing continued
- }
-
- }
- else
- {
- // Error - not enough data for low surrogate - end processing
- continue 1;
- }
-
- }
- else
- {
- // Low surrogate of a surrogate pair
- // This should not happen - it means this is a lone low surrogate
- // Don't add it to the output
- }
-
- }
-
- // Return the result
- return $output;
-
-
-}
-
-/******************************************************************************
-* End of Function: UTF16_to_unicode_array
-******************************************************************************/
-
-
-
-
-
-
-
-/******************************************************************************
-*
-* Function: unicode_array_to_UTF8
-*
-* Description: Converts an array of unicode character numbers to a string
-* encoded by UTF-8
-*
-* Parameters: unicode_array - the array containing unicode character numbers
-*
-* Returns: output - the UTF-8 encoded string representing the data
-*
-******************************************************************************/
-
-function unicode_array_to_UTF8( $unicode_array )
-{
-
- // Create a string to receive the UTF-8 output
- $output = "";
-
- // Cycle through each Unicode character number
- foreach( $unicode_array as $unicode_char )
- {
- // Check which range the current unicode character lies in
- if ( ( $unicode_char >= 0x00 ) && ( $unicode_char <= 0x7F ) )
- {
- // 1 Byte UTF-8 Unicode (7-Bit ASCII) Character
-
- $output .= chr($unicode_char); // Output is equal to input for 7-bit ASCII
- }
- else if ( ( $unicode_char >= 0x80 ) && ( $unicode_char <= 0x7FF ) )
- {
- // 2 Byte UTF-8 Unicode - binary encode data as : 110xxxxx 10xxxxxx
-
- $output .= chr(0xC0 + ($unicode_char/0x40));
- $output .= chr(0x80 + ($unicode_char & 0x3F));
- }
- else if ( ( $unicode_char >= 0x800 ) && ( $unicode_char <= 0xFFFF ) )
- {
- // 3 Byte UTF-8 Unicode - binary encode data as : 1110xxxx 10xxxxxx 10xxxxxx
-
- $output .= chr(0xE0 + ($unicode_char/0x1000));
- $output .= chr(0x80 + (($unicode_char/0x40) & 0x3F));
- $output .= chr(0x80 + ($unicode_char & 0x3F));
- }
- else if ( ( $unicode_char >= 0x10000 ) && ( $unicode_char <= 0x1FFFFF ) )
- {
- // 4 Byte UTF-8 Unicode - binary encode data as : 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx
-
- $output .= chr(0xF0 + ($unicode_char/0x40000));
- $output .= chr(0x80 + (($unicode_char/0x1000) & 0x3F));
- $output .= chr(0x80 + (($unicode_char/0x40) & 0x3F));
- $output .= chr(0x80 + ($unicode_char & 0x3F));
- }
- else if ( ( $unicode_char >= 0x200000 ) && ( $unicode_char <= 0x3FFFFFF ) )
- {
- // 5 Byte UTF-8 Unicode - binary encode data as : 111110xx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx
-
- $output .= chr(0xF8 + ($unicode_char/0x1000000));
- $output .= chr(0x80 + (($unicode_char/0x40000) & 0x3F));
- $output .= chr(0x80 + (($unicode_char/0x1000) & 0x3F));
- $output .= chr(0x80 + (($unicode_char/0x40) & 0x3F));
- $output .= chr(0x80 + ($unicode_char & 0x3F));
- }
- else if ( ( $unicode_char >= 0x4000000 ) && ( $unicode_char <= 0x7FFFFFFF ) )
- {
- // 6 Byte UTF-8 Unicode - binary encode data as : 1111110x 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx
-
- $output .= chr(0xFC + ($unicode_char/0x40000000));
- $output .= chr(0x80 + (($unicode_char/0x1000000) & 0x3F));
- $output .= chr(0x80 + (($unicode_char/0x40000) & 0x3F));
- $output .= chr(0x80 + (($unicode_char/0x1000) & 0x3F));
- $output .= chr(0x80 + (($unicode_char/0x40) & 0x3F));
- $output .= chr(0x80 + ($unicode_char & 0x3F));
- }
- else
- {
- // Invalid Code - do nothing
- }
-
- }
-
- // Return resulting UTF-8 String
- return $output;
-}
-
-/******************************************************************************
-* End of Function: unicode_array_to_UTF8
-******************************************************************************/
-
-
-
-
-
-
-
-
-
-/******************************************************************************
-*
-* Function: unicode_array_to_UTF16
-*
-* Description: Converts an array of unicode character numbers to a string
-* encoded by UTF-16
-*
-* Parameters: unicode_array - the array containing unicode character numbers
-* MSB_first - True will cause processing as Big Endian UTF-16 (Motorola, MSB first)
-* False will cause processing as Little Endian UTF-16 (Intel, LSB first)
-*
-* Returns: output - the UTF-16 encoded string representing the data
-*
-******************************************************************************/
-
-function unicode_array_to_UTF16( $unicode_array, $MSB_first )
-{
-
- // Create a string to receive the UTF-16 output
- $output = "";
-
- // Cycle through each Unicode character number
- foreach( $unicode_array as $unicode_char )
- {
- // Check which range the current unicode character lies in
- if ( ( ( $unicode_char >= 0x0000 ) && ( $unicode_char <= 0xD7FF ) ) ||
- ( ( $unicode_char >= 0xE000 ) && ( $unicode_char <= 0xFFFF ) ) )
- {
- // Normal 16 Bit Character (Not a Surrogate Pair)
-
- // Check what byte order should be used
- if ( $MSB_first )
- {
- // Big Endian
- $output .= chr( $unicode_char / 0x100 ) . chr( $unicode_char % 0x100 ) ;
- }
- else
- {
- // Little Endian
- $output .= chr( $unicode_char % 0x100 ) . chr( $unicode_char / 0x100 ) ;
- }
-
- }
- else if ( ( $unicode_char >= 0x10000 ) && ( $unicode_char <= 0x10FFFF ) )
- {
- // Surrogate Pair required
-
- // Calculate Surrogates
- $High_Surrogate = ( ( $unicode_char - 0x10000 ) / 0x400 ) + 0xD800;
- $Low_Surrogate = ( ( $unicode_char - 0x10000 ) % 0x400 ) + 0xDC00;
-
- // Check what byte order should be used
- if ( $MSB_first )
- {
- // Big Endian
- $output .= chr( $High_Surrogate / 0x100 ) . chr( $High_Surrogate % 0x100 );
- $output .= chr( $Low_Surrogate / 0x100 ) . chr( $Low_Surrogate % 0x100 );
- }
- else
- {
- // Little Endian
- $output .= chr( $High_Surrogate % 0x100 ) . chr( $High_Surrogate / 0x100 );
- $output .= chr( $Low_Surrogate % 0x100 ) . chr( $Low_Surrogate / 0x100 );
- }
- }
- else
- {
- // Invalid UTF-16 codepoint
- // Unicode value should never be between 0xD800 and 0xDFFF
- // Do not output this point - there is no way to encode it in UTF-16
- }
-
- }
-
- // Return resulting UTF-16 String
- return $output;
-}
-
-/******************************************************************************
-* End of Function: unicode_array_to_UTF16
-******************************************************************************/
-
-
-
-
-
-/******************************************************************************
-*
-* Function: xml_UTF8_clean
-*
-* Description: XML has specific requirements about the characters that are
-* allowed, and characters that must be escaped.
-* This function ensures that all characters in the given string
-* are valid, and that characters such as Quotes, Greater than,
-* Less than and Ampersand are properly escaped. Newlines and Tabs
-* are also escaped.
-* Note - Do not use this on constructed XML which includes tags,
-* as it will escape the tags. It is designed to be used
-* on the tag and attribute names, attribute values, and text.
-*
-* Parameters: utf8_text - a string containing the UTF-8 data
-*
-* Returns: output - the array containing the unicode character numbers
-*
-******************************************************************************/
-
-function xml_UTF8_clean( $UTF8_text )
-{
- // Ensure that the Unicode UTF8 encoding is valid.
-
- $UTF8_text = UTF8_fix( $UTF8_text );
-
-
- // XML only allows characters in the following unicode ranges
- // #x9 | #xA | #xD | [#x20-#xD7FF] | [#xE000-#xFFFD] | [#x10000-#x10FFFF]
- // Hence we need to delete any characters that dont fit this
-
- // Convert the UTF-8 string to an array of unicode character numbers
- $unicode_array = UTF8_to_unicode_array( $UTF8_text );
-
- // Create a new array to receive the valid unicode character numbers
- $new_unicode_array = array( );
-
- // Cycle through the unicode character numbers
- foreach( $unicode_array as $unichar )
- {
- // Check if the unicode character number is valid for XML
- if ( ( $unichar == 0x09 ) ||
- ( $unichar == 0x0A ) ||
- ( $unichar == 0x0D ) ||
- ( ( $unichar >= 0x20 ) && ( $unichar <= 0xD7FF ) ) ||
- ( ( $unichar >= 0xE000 ) && ( $unichar <= 0xFFFD ) ) ||
- ( ( $unichar >= 0x10000 ) && ( $unichar <= 0x10FFFF ) ) )
- {
- // Unicode character is valid for XML - add it to the valid characters array
- $new_unicode_array[] = $unichar;
- }
-
- }
-
- // Convert the array of valid unicode character numbers back to UTF-8 encoded text
- $UTF8_text = unicode_array_to_UTF8( $new_unicode_array );
-
- // Escape any special HTML characters present
- $UTF8_text = htmlspecialchars ( $UTF8_text, ENT_QUOTES );
-
- // Escape CR, LF and TAB characters, so that they are kept and not treated as expendable white space
- $trans = array( "\x09" => "&#x09;", "\x0A" => "&#x0A;", "\x0D" => "&#x0D;" );
- $UTF8_text = strtr( $UTF8_text, $trans );
-
- // Return the resulting XML valid string
- return $UTF8_text;
-}
-
-/******************************************************************************
-* End of Function: xml_UTF8_clean
-******************************************************************************/
-
-
-
-
-
-
-
-
-
-/******************************************************************************
-*
-* Function: xml_UTF16_clean
-*
-* Description: XML has specific requirements about the characters that are
-* allowed, and characters that must be escaped.
-* This function ensures that all characters in the given string
-* are valid, and that characters such as Quotes, Greater than,
-* Less than and Ampersand are properly escaped. Newlines and Tabs
-* are also escaped.
-* Note - Do not use this on constructed XML which includes tags,
-* as it will escape the tags. It is designed to be used
-* on the tag and attribute names, attribute values, and text.
-*
-* Parameters: utf16_text - a string containing the UTF-16 data
-* MSB_first - True will cause processing as Big Endian UTF-16 (Motorola, MSB first)
-* False will cause processing as Little Endian UTF-16 (Intel, LSB first)
-*
-* Returns: output - the array containing the unicode character numbers
-*
-******************************************************************************/
-
-function xml_UTF16_clean( $UTF16_text, $MSB_first )
-{
- // Ensure that the Unicode UTF16 encoding is valid.
-
- $UTF16_text = UTF16_fix( $UTF16_text, $MSB_first );
-
-
- // XML only allows characters in the following unicode ranges
- // #x9 | #xA | #xD | [#x20-#xD7FF] | [#xE000-#xFFFD] | [#x10000-#x10FFFF]
- // Hence we need to delete any characters that dont fit this
-
- // Convert the UTF-16 string to an array of unicode character numbers
- $unicode_array = UTF16_to_unicode_array( $UTF16_text, $MSB_first );
-
- // Create a new array to receive the valid unicode character numbers
- $new_unicode_array = array( );
-
- // Cycle through the unicode character numbers
- foreach( $unicode_array as $unichar )
- {
- // Check if the unicode character number is valid for XML
- if ( ( $unichar == 0x09 ) ||
- ( $unichar == 0x0A ) ||
- ( $unichar == 0x0D ) ||
- ( ( $unichar >= 0x20 ) && ( $unichar <= 0xD7FF ) ) ||
- ( ( $unichar >= 0xE000 ) && ( $unichar <= 0xFFFD ) ) ||
- ( ( $unichar >= 0x10000 ) && ( $unichar <= 0x10FFFF ) ) )
- {
- // Unicode character is valid for XML - add it to the valid characters array
- $new_unicode_array[] = $unichar;
- }
-
- }
-
- // Convert the array of valid unicode character numbers back to UTF-16 encoded text
- $UTF16_text = unicode_array_to_UTF16( $new_unicode_array, $MSB_first );
-
- // Escape any special HTML characters present
- $UTF16_text = htmlspecialchars ( $UTF16_text, ENT_QUOTES );
-
- // Escape CR, LF and TAB characters, so that they are kept and not treated as expendable white space
- $trans = array( "\x09" => "&#x09;", "\x0A" => "&#x0A;", "\x0D" => "&#x0D;" );
- $UTF16_text = strtr( $UTF16_text, $trans );
-
- // Return the resulting XML valid string
- return $UTF16_text;
-}
-
-/******************************************************************************
-* End of Function: xml_UTF16_clean
-******************************************************************************/
-
-
-
-
-
-
-/******************************************************************************
-*
-* Function: HTML_UTF8_Escape
-*
-* Description: A HTML page can display UTF-8 data properly if it has a
-* META http-equiv="Content-Type" tag with the content attribute
-* including the value: "charset=utf-8".
-* Otherwise the ISO-8859-1 character set is usually assumed, and
-* Unicode values above 0x7F must be escaped.
-* This function takes a UTF-8 encoded string and escapes the
-* characters above 0x7F as well as reserved HTML characters such
-* as Quotes, Greater than, Less than and Ampersand.
-*
-* Parameters: utf8_text - a string containing the UTF-8 data
-*
-* Returns: htmloutput - a string containing the HTML equivalent
-*
-******************************************************************************/
-
-function HTML_UTF8_Escape( $UTF8_text )
-{
-
- // Ensure that the Unicode UTF8 encoding is valid.
- $UTF8_text = UTF8_fix( $UTF8_text );
-
- // Change: changed to use smart_htmlspecialchars, so that characters which were already escaped would remain intact, as of revision 1.10
- // Escape any special HTML characters present
- $UTF8_text = smart_htmlspecialchars( $UTF8_text, ENT_QUOTES );
-
- // Convert the UTF-8 string to an array of unicode character numbers
- $unicode_array = UTF8_to_unicode_array( $UTF8_text );
-
- // Create a string to receive the escaped HTML
- $htmloutput = "";
-
- // Cycle through the unicode character numbers
- foreach( $unicode_array as $unichar )
- {
- // Check if the character needs to be escaped
- if ( ( $unichar >= 0x00 ) && ( $unichar <= 0x7F ) )
- {
- // Character is less than 0x7F - add it to the html as is
- $htmloutput .= chr( $unichar );
- }
- else
- {
- // Character is greater than 0x7F - escape it and add it to the html
- $htmloutput .= "&#x" . dechex($unichar) . ";";
- }
- }
-
- // Return the resulting escaped HTML
- return $htmloutput;
-}
-
-/******************************************************************************
-* End of Function: HTML_UTF8_Escape
-******************************************************************************/
-
-
-
-/******************************************************************************
-*
-* Function: HTML_UTF8_UnEscape
-*
-* Description: Converts HTML which contains escaped decimal or hex characters
-* into UTF-8 text
-*
-* Parameters: HTML_text - a string containing the HTML text to convert
-*
-* Returns: utfoutput - a string containing the UTF-8 equivalent
-*
-******************************************************************************/
-
-function HTML_UTF8_UnEscape( $HTML_text )
-{
- preg_match_all( "/\&\#(\d+);/", $HTML_text, $matches);
- preg_match_all( "/\&\#[x|X]([A|B|C|D|E|F|a|b|c|d|e|f|0-9]+);/", $HTML_text, $hexmatches);
- foreach( $hexmatches[1] as $index => $match )
- {
- $matches[0][] = $hexmatches[0][$index];
- $matches[1][] = hexdec( $match );
- }
-
- for ( $i = 0; $i < count( $matches[ 0 ] ); $i++ )
- {
- $trans = array( $matches[0][$i] => unicode_array_to_UTF8( array( $matches[1][$i] ) ) );
-
- $HTML_text = strtr( $HTML_text , $trans );
- }
- return $HTML_text;
-}
-
-/******************************************************************************
-* End of Function: HTML_UTF8_UnEscape
-******************************************************************************/
-
-
-
-
-
-
-/******************************************************************************
-*
-* Function: HTML_UTF16_Escape
-*
-* Description: A HTML page can display UTF-16 data properly if it has a
-* META http-equiv="Content-Type" tag with the content attribute
-* including the value: "charset=utf-16".
-* Otherwise the ISO-8859-1 character set is usually assumed, and
-* Unicode values above 0x7F must be escaped.
-* This function takes a UTF-16 encoded string and escapes the
-* characters above 0x7F as well as reserved HTML characters such
-* as Quotes, Greater than, Less than and Ampersand.
-*
-* Parameters: utf16_text - a string containing the UTF-16 data
-* MSB_first - True will cause processing as Big Endian UTF-16 (Motorola, MSB first)
-* False will cause processing as Little Endian UTF-16 (Intel, LSB first)
-*
-* Returns: htmloutput - a string containing the HTML equivalent
-*
-******************************************************************************/
-
-function HTML_UTF16_Escape( $UTF16_text, $MSB_first )
-{
-
- // Ensure that the Unicode UTF16 encoding is valid.
- $UTF16_text = UTF16_fix( $UTF16_text, $MSB_first );
-
- // Change: changed to use smart_htmlspecialchars, so that characters which were already escaped would remain intact, as of revision 1.10
- // Escape any special HTML characters present
- $UTF16_text = smart_htmlspecialchars( $UTF16_text );
-
- // Convert the UTF-16 string to an array of unicode character numbers
- $unicode_array = UTF16_to_unicode_array( $UTF16_text, $MSB_first );
-
- // Create a string to receive the escaped HTML
- $htmloutput = "";
-
- // Cycle through the unicode character numbers
- foreach( $unicode_array as $unichar )
- {
- // Check if the character needs to be escaped
- if ( ( $unichar >= 0x00 ) && ( $unichar <= 0x7F ) )
- {
- // Character is less than 0x7F - add it to the html as is
- $htmloutput .= chr( $unichar );
- }
- else
- {
- // Character is greater than 0x7F - escape it and add it to the html
- $htmloutput .= "&#x" . dechex($unichar) . ";";
- }
- }
-
- // Return the resulting escaped HTML
- return $htmloutput;
-}
-
-/******************************************************************************
-* End of Function: HTML_UTF16_Escape
-******************************************************************************/
-
-
-/******************************************************************************
-*
-* Function: HTML_UTF16_UnEscape
-*
-* Description: Converts HTML which contains escaped decimal or hex characters
-* into UTF-16 text
-*
-* Parameters: HTML_text - a string containing the HTML text to be converted
-* MSB_first - True will cause processing as Big Endian UTF-16 (Motorola, MSB first)
-* False will cause processing as Little Endian UTF-16 (Intel, LSB first)
-*
-* Returns: utfoutput - a string containing the UTF-16 equivalent
-*
-******************************************************************************/
-
-function HTML_UTF16_UnEscape( $HTML_text, $MSB_first )
-{
- $utf8_text = HTML_UTF8_UnEscape( $HTML_text );
-
- return unicode_array_to_UTF16( UTF8_to_unicode_array( $utf8_text ), $MSB_first );
-}
-
-/******************************************************************************
-* End of Function: HTML_UTF16_UnEscape
-******************************************************************************/
-
-
-
-
-/******************************************************************************
-*
-* Function: smart_HTML_Entities
-*
-* Description: Performs the same function as HTML_Entities, but leaves entities
-* that are already escaped intact.
-*
-* Parameters: HTML_text - a string containing the HTML text to be escaped
-*
-* Returns: HTML_text_out - a string containing the escaped HTML text
-*
-******************************************************************************/
-
-function smart_HTML_Entities( $HTML_text )
-{
- // Get a table containing the HTML entities translations
- $translation_table = get_html_translation_table( HTML_ENTITIES );
-
- // Change the ampersand to translate to itself, to avoid getting &amp;
- $translation_table[ chr(38) ] = '&';
-
- // Perform replacements
- // Regular expression says: find an ampersand, check the text after it,
- // if the text after it is not one of the following, then replace the ampersand
- // with &amp;
- // a) any combination of up to 4 letters (upper or lower case) with at least 2 or 3 non whitespace characters, then a semicolon
- // b) a hash symbol, then between 2 and 7 digits
- // c) a hash symbol, an 'x' character, then between 2 and 7 digits
- // d) a hash symbol, an 'X' character, then between 2 and 7 digits
- return preg_replace( "/&(?![A-Za-z]{0,4}\w{2,3};|#[0-9]{2,7}|#x[0-9]{2,7}|#X[0-9]{2,7};)/","&amp;" , strtr( $HTML_text, $translation_table ) );
-}
-
-/******************************************************************************
-* End of Function: smart_HTML_Entities
-******************************************************************************/
-
-
-
-/******************************************************************************
-*
-* Function: smart_htmlspecialchars
-*
-* Description: Performs the same function as htmlspecialchars, but leaves characters
-* that are already escaped intact.
-*
-* Parameters: HTML_text - a string containing the HTML text to be escaped
-*
-* Returns: HTML_text_out - a string containing the escaped HTML text
-*
-******************************************************************************/
-
-function smart_htmlspecialchars( $HTML_text )
-{
- // Get a table containing the HTML special characters translations
- $translation_table=get_html_translation_table (HTML_SPECIALCHARS);
-
- // Change the ampersand to translate to itself, to avoid getting &amp;
- $translation_table[ chr(38) ] = '&';
-
- // Perform replacements
- // Regular expression says: find an ampersand, check the text after it,
- // if the text after it is not one of the following, then replace the ampersand
- // with &amp;
- // a) any combination of up to 4 letters (upper or lower case) with at least 2 or 3 non whitespace characters, then a semicolon
- // b) a hash symbol, then between 2 and 7 digits
- // c) a hash symbol, an 'x' character, then between 2 and 7 digits
- // d) a hash symbol, an 'X' character, then between 2 and 7 digits
- return preg_replace( "/&(?![A-Za-z]{0,4}\w{2,3};|#[0-9]{2,7}|#x[0-9]{2,7}|#X[0-9]{2,7};)/","&amp;" , strtr( $HTML_text, $translation_table ) );
-}
-
-/******************************************************************************
-* End of Function: smart_htmlspecialchars
-******************************************************************************/
-
-
-?> \ No newline at end of file
generated by cgit v1.3 (git 2.53.0) at 2026-06-29 22:02:40 +0000