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Docker image / push (push) Canceled after 0s
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91 lines
1.7 KiB
PHP
91 lines
1.7 KiB
PHP
<?php
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declare(strict_types=1);
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namespace MRBS\Utf8;
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use InvalidArgumentException;
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use MRBS\System;
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use RuntimeException;
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class Utf8Char
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{
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private $char;
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public function __construct(string $char)
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{
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$this->char = $char;
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}
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/**
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* Convert to UTF-16
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*/
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public function toUtf16(int $endianness) : string
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{
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switch ($endianness)
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{
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case System::BIG_ENDIAN:
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$format = 'n';
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break;
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case System::LITTLE_ENDIAN:
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$format = 'v';
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break;
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default:
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throw new InvalidArgumentException("Unknown endianness '$endianness'");
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break;
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}
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$ucs_string = pack($format, self::convertCharToUtf16Int($this->char));
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//error_log(sprintf("UCS %04x -> %02x,%02x",$char,ord($ucs_string[0]),ord($ucs_string[1])));
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return $ucs_string;
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}
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/**
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* Convert a character to UTF-16
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*/
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private static function convertCharToUtf16Int(string $char) : int
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{
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$c0 = ord($char[0]);
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// Easy case, code is 0xxxxxxx - just use it as is
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if ($c0 < 0x80)
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{
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return $c0;
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}
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$cn = ord($char[1]) ^ 0x80;
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$ucs = ($c0 << 6) | $cn;
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// Two byte codes: 110xxxxx 10xxxxxx
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if ($c0 < 0xE0)
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{
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$ucs &= ~0x3000;
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return $ucs;
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}
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$cn = ord($char[2]) ^ 0x80;
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$ucs = ($ucs << 6) | $cn;
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// Three byte codes: 1110xxxx 10xxxxxx 10xxxxxx
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if ($c0 < 0xF0)
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{
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$ucs &= ~0xE0000;
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return $ucs;
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}
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$cn = ord($char[3]) ^ 0x80;
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$ucs = ($ucs << 6) | $cn;
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// Four byte codes: 11110xxx 10xxxxxxx 10xxxxxx 10xxxxxx
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if ($c0 < 0xF8)
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{
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$ucs &= ~0x3C00000;
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return $ucs;
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}
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throw new RuntimeException("Shouldn't get here.");
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}
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}
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