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<?php
namespace smpp\helpers;
/**
* Class capable of encoding GSM 03.38 default alphabet and packing octets into septets as described by GSM 03.38.
* Based on mapping: http://www.unicode.org/Public/MAPPINGS/ETSI/GSM0338.TXT
*
* Copyright (C) 2011 OnlineCity
* Licensed under the MIT license, which can be read at: http://www.opensource.org/licenses/mit-license.php
* @author hd@onlinecity.dk
*/
class GsmEncoderHelper
{
/**
* Encode an UTF-8 string into GSM 03.38
* Since UTF-8 is largely ASCII compatible, and GSM 03.38 is somewhat compatible, unnecessary conversions are removed.
* Specials chars such as € can be encoded by using an escape char \x1B in front of a backwards compatible (similar) char.
* UTF-8 chars which doesn't have a GSM 03.38 equivalent is replaced with a question mark.
* UTF-8 continuation bytes (\x08-\xBF) are replaced when encountered in their valid places, but
* any continuation bytes outside of a valid UTF-8 sequence is not processed.
*
* @param string $string
* @return string
*/
public static function utf8ToGsm0338(string $string): string
{
$dict = [
'@' => "\x00",
'£' => "\x01",
'$' => "\x02",
'¥' => "\x03",
'è' => "\x04",
'é' => "\x05",
'ù' => "\x06",
'ì' => "\x07",
'ò' => "\x08",
'Ç' => "\x09",
'Ø' => "\x0B",
'ø' => "\x0C",
'Å' => "\x0E",
'å' => "\x0F",
'Δ' => "\x10",
'_' => "\x11",
'Φ' => "\x12",
'Γ' => "\x13",
'Λ' => "\x14",
'Ω' => "\x15",
'Π' => "\x16",
'Ψ' => "\x17",
'Σ' => "\x18",
'Θ' => "\x19",
'Ξ' => "\x1A",
'Æ' => "\x1C",
'æ' => "\x1D",
'ß' => "\x1E",
'É' => "\x1F",
'А' => "\x04\x10",
'Б' => "\x04\x11",
'В' => "\x04\x12",
'Г' => "\x04\x13",
'Д' => "\x04\x14",
'Е' => "\x04\x15",
'Ё' => "\x04\x01",
'Ж' => "\x04\x16",
'З' => "\x04\x17",
'И' => "\x04\x18",
'Й' => "\x04\x19",
'К' => "\x04\x1A",
'Л' => "\x04\x1B",
'М' => "\x04\x1C",
'Н' => "\x04\x1D",
'О' => "\x04\x1E",
'П' => "\x04\x1F",
'Р' => "\x04\x20",
'С' => "\x04\x21",
'Т' => "\x04\x22",
'У' => "\x04\x23",
'Ф' => "\x04\x24",
'Х' => "\x04\x25",
'Ц' => "\x04\x26",
'Ч' => "\x04\x27",
'Ш' => "\x04\x28",
'Щ' => "\x04\x29",
'Ь' => "\x04\x2A",
'Ы' => "\x04\x2B",
'Ъ' => "\x04\x2C",
'Э' => "\x04\x2D",
'Ю' => "\x04\x2E",
'Я' => "\x04\x2F",
'а' => "\x04\x30",
'б' => "\x04\x31",
'в' => "\x04\x32",
'г' => "\x04\x33",
'д' => "\x04\x34",
'е' => "\x04\x35",
'ё' => "\x04\x51",
'ж' => "\x04\x36",
'з' => "\x04\x37",
'и' => "\x04\x38",
'й' => "\x04\x39",
'к' => "\x04\x3A",
'л' => "\x04\x3B",
'м' => "\x04\x3C",
'н' => "\x04\x3D",
'о' => "\x04\x3E",
'п' => "\x04\x3F",
'р' => "\x04\x40",
'с' => "\x04\x41",
'т' => "\x04\x42",
'у' => "\x04\x43",
'ф' => "\x04\x44",
'х' => "\x04\x45",
'ц' => "\x04\x46",
'ч' => "\x04\x47",
'ш' => "\x04\x48",
'щ' => "\x04\x49",
'ь' => "\x04\x4A",
'ы' => "\x04\x4B",
'ъ' => "\x04\x4C",
'э' => "\x04\x4D",
'ю' => "\x04\x4E",
'я' => "\x04\x4F",
// all \x2? removed
// all \x3? removed
'¡' => "\x40",
'Ä' => "\x5B",
'Ö' => "\x5C",
'Ñ' => "\x5D",
'Ü' => "\x5E",
'§' => "\x5F",
'¿' => "\x60",
'ä' => "\x7B",
'ö' => "\x7C",
'ñ' => "\x7D",
'ü' => "\x7E",
'à' => "\x7F",
'^' => "\x1B\x14",
'{' => "\x1B\x28",
'}' => "\x1B\x29",
'\\' => "\x1B\x2F",
'[' => "\x1B\x3C",
'~' => "\x1B\x3D",
']' => "\x1B\x3E",
'|' => "\x1B\x40",
'€' => "\x1B\x65"
];
// Replace unconverted UTF-8 chars from codepages U+0080-U+07FF, U+0080-U+FFFF and U+010000-U+10FFFF with a single ?
// return preg_replace('/([\\xC0-\\xDF].)|([\\xE0-\\xEF]..)|([\\xF0-\\xFF]...)/m','?',$converted);
return strtr($string, $dict);
}
/**
* Count the number of GSM 03.38 chars a conversion would contain.
* It's about 3 times faster to count than convert and do strlen() if conversion is not required.
*
* @param string $utf8String
*
* @return integer
*/
public static function countGsm0338Length(string $utf8String): int
{
$len = mb_strlen($utf8String, 'utf-8');
$len += preg_match_all('/[\\^{}\\\~€|\\[\\]]/mu', $utf8String, $m);
return $len;
}
/**
* Pack an 8-bit string into 7-bit GSM format
* Returns the packed string in binary format
*
* @param string $data
*
* @return string
*/
public static function pack7bit(string $data): string
{
$l = strlen($data);
$currentByte = 0;
$offset = 0;
$packed = '';
for ($i = 0; $i < $l; $i++) {
// cap off any excess bytes
$septet = ord($data[$i]) & 0x7f;
// append the septet and then cap off excess bytes
$currentByte |= ($septet << $offset) & 0xff;
// update offset
$offset += 7;
if ($offset > 7) {
// the current byte is full, add it to the encoded data.
$packed .= chr($currentByte);
// shift left and append the left shifted septet to the current byte
$currentByte = $septet = $septet >> (7 - ($offset - 8));
// update offset
// 7 - (7 - ($offset - 8))
$offset -= 8;
}
}
// append the last byte
if ($currentByte > 0) {
$packed .= chr($currentByte);
}
return $packed;
}
}
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