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<?php
namespace WordPress\Encoding;
/**
* UTF-8 encoding pipeline by Dennis Snell (@dmsnell).
*
* It enables parsing XML documents with incomplete UTF-8 byte sequences
* without crashing or depending on the mbstring extension.
*/
/**
* Encode a code point number into the UTF-8 encoding.
*
* This encoder implements the UTF-8 encoding algorithm for converting
* a code point into a byte sequence. If it receives an invalid code
* point it will return the Unicode Replacement Character U+FFFD `�`.
*
* Example:
*
* '🅰' === WP_HTML_Decoder::codepoint_to_utf8_bytes( 0x1f170 );
*
* // Half of a surrogate pair is an invalid code point.
* '�' === WP_HTML_Decoder::codepoint_to_utf8_bytes( 0xd83c );
*
* @since 6.6.0
*
* @see https://www.rfc-editor.org/rfc/rfc3629 For the UTF-8 standard.
*
* @param int $codepoint Which code point to convert.
* @return string Converted code point, or `�` if invalid.
*/
function codepoint_to_utf8_bytes( $codepoint ) {
// Pre-check to ensure a valid code point.
if (
$codepoint <= 0 ||
( $codepoint >= 0xD800 && $codepoint <= 0xDFFF ) ||
$codepoint > 0x10FFFF
) {
return '�';
}
if ( $codepoint <= 0x7F ) {
return chr( $codepoint );
}
if ( $codepoint <= 0x7FF ) {
$byte1 = chr( ( 0xC0 | ( ( $codepoint >> 6 ) & 0x1F ) ) );
$byte2 = chr( $codepoint & 0x3F | 0x80 );
return "{$byte1}{$byte2}";
}
if ( $codepoint <= 0xFFFF ) {
$byte1 = chr( ( $codepoint >> 12 ) | 0xE0 );
$byte2 = chr( ( $codepoint >> 6 ) & 0x3F | 0x80 );
$byte3 = chr( $codepoint & 0x3F | 0x80 );
return "{$byte1}{$byte2}{$byte3}";
}
// Any values above U+10FFFF are eliminated above in the pre-check.
$byte1 = chr( ( $codepoint >> 18 ) | 0xF0 );
$byte2 = chr( ( $codepoint >> 12 ) & 0x3F | 0x80 );
$byte3 = chr( ( $codepoint >> 6 ) & 0x3F | 0x80 );
$byte4 = chr( $codepoint & 0x3F | 0x80 );
return "{$byte1}{$byte2}{$byte3}{$byte4}";
}