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Php82.php
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Php82.php
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<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <fabien@symfony.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Symfony\Polyfill\Php82;
/**
* @author Alexander M. Turek <me@derrabus.de>
* @author Greg Roach <greg@subaqua.co.uk>
*
* @internal
*/
class Php82
{
/**
* Determines if a string matches the ODBC quoting rules.
*
* A valid quoted string begins with a '{', ends with a '}', and has no '}'
* inside of the string that aren't repeated (as to be escaped).
*
* These rules are what .NET also follows.
*
* @see https://github.com/php/php-src/blob/838f6bffff6363a204a2597cbfbaad1d7ee3f2b6/main/php_odbc_utils.c#L31-L57
*/
public static function odbc_connection_string_is_quoted(string $str): bool
{
if ('' === $str || '{' !== $str[0]) {
return false;
}
/* Check for } that aren't doubled up or at the end of the string */
$length = \strlen($str) - 1;
for ($i = 0; $i < $length; ++$i) {
if ('}' !== $str[$i]) {
continue;
}
if ('}' !== $str[++$i]) {
return $i === $length;
}
}
return true;
}
/**
* Determines if a value for a connection string should be quoted.
*
* The ODBC specification mentions:
* "Because of connection string and initialization file grammar, keywords and
* attribute values that contain the characters []{}(),;?*=!@ not enclosed
* with braces should be avoided."
*
* Note that it assumes that the string is *not* already quoted. You should
* check beforehand.
*
* @see https://github.com/php/php-src/blob/838f6bffff6363a204a2597cbfbaad1d7ee3f2b6/main/php_odbc_utils.c#L59-L73
*/
public static function odbc_connection_string_should_quote(string $str): bool
{
return false !== strpbrk($str, '[]{}(),;?*=!@');
}
public static function odbc_connection_string_quote(string $str): string
{
return '{'.str_replace('}', '}}', $str).'}';
}
/**
* Implementation closely based on the original C code - including the GOTOs
* and pointer-style string access.
*
* @see https://github.com/php/php-src/blob/master/Zend/zend_ini.c
*/
public static function ini_parse_quantity(string $value): int
{
// Avoid dependency on ctype_space()
$ctype_space = " \t\v\r\n\f";
$str = 0;
$str_end = \strlen($value);
$digits = $str;
$overflow = false;
/* Ignore leading whitespace, but keep it for error messages. */
while ($digits < $str_end && false !== strpos($ctype_space, $value[$digits])) {
++$digits;
}
/* Ignore trailing whitespace, but keep it for error messages. */
while ($digits < $str_end && false !== strpos($ctype_space, $value[$str_end - 1])) {
--$str_end;
}
if ($digits === $str_end) {
return 0;
}
$is_negative = false;
if ('+' === $value[$digits]) {
++$digits;
} elseif ('-' === $value[$digits]) {
$is_negative = true;
++$digits;
}
if ($value[$digits] < '0' || $value[$digits] > 9) {
$message = sprintf(
'Invalid quantity "%s": no valid leading digits, interpreting as "0" for backwards compatibility',
self::escapeString($value)
);
trigger_error($message, \E_USER_WARNING);
return 0;
}
$base = 10;
$allowed_digits = '0123456789';
if ('0' === $value[$digits] && ($digits + 1 === $str_end || false === strpos($allowed_digits, $value[$digits + 1]))) {
if ($digits + 1 === $str_end) {
return 0;
}
switch ($value[$digits + 1]) {
case 'g':
case 'G':
case 'm':
case 'M':
case 'k':
case 'K':
goto evaluation;
case 'x':
case 'X':
$base = 16;
$allowed_digits = '0123456789abcdefABCDEF';
break;
case 'o':
case 'O':
$base = 8;
$allowed_digits = '01234567';
break;
case 'b':
case 'B':
$base = 2;
$allowed_digits = '01';
break;
default:
$message = sprintf(
'Invalid prefix "0%s", interpreting as "0" for backwards compatibility',
$value[$digits + 1]
);
trigger_error($message, \E_USER_WARNING);
return 0;
}
$digits += 2;
if ($digits === $str_end) {
$message = sprintf(
'Invalid quantity "%s": no digits after base prefix, interpreting as "0" for backwards compatibility',
self::escapeString($value)
);
trigger_error($message, \E_USER_WARNING);
return 0;
}
$digits_consumed = $digits;
/* Ignore leading whitespace. */
while ($digits_consumed < $str_end && false !== strpos($ctype_space, $value[$digits_consumed])) {
++$digits_consumed;
}
if ($digits_consumed !== $str_end && ('+' === $value[$digits_consumed] || '-' === $value[$digits_consumed])) {
++$digits_consumed;
}
if ('0' === $value[$digits_consumed]) {
/* Value is just 0 */
if ($digits_consumed + 1 === $str_end) {
goto evaluation;
}
switch ($value[$digits_consumed + 1]) {
case 'x':
case 'X':
case 'o':
case 'O':
case 'b':
case 'B':
$digits_consumed += 2;
break;
}
}
if ($digits !== $digits_consumed) {
$message = sprintf(
'Invalid quantity "%s": no digits after base prefix, interpreting as "0" for backwards compatibility',
self::escapeString($value)
);
trigger_error($message, \E_USER_WARNING);
return 0;
}
}
evaluation:
if (10 === $base && '0' === $value[$digits]) {
$base = 8;
$allowed_digits = '01234567';
}
while ($digits < $str_end && ' ' === $value[$digits]) {
++$digits;
}
if ($digits < $str_end && '+' === $value[$digits]) {
++$digits;
} elseif ($digits < $str_end && '-' === $value[$digits]) {
$is_negative = true;
$overflow = true;
++$digits;
}
$digits_end = $digits;
while ($digits_end < $str_end && false !== strpos($allowed_digits, $value[$digits_end])) {
++$digits_end;
}
$retval = base_convert(substr($value, $digits, $digits_end - $digits), $base, 10);
if ($is_negative && '0' === $retval) {
$is_negative = false;
$overflow = false;
}
// Check for overflow - remember that -PHP_INT_MIN = 1 + PHP_INT_MAX
if ($is_negative) {
$signed_max = strtr((string) \PHP_INT_MIN, ['-' => '']);
} else {
$signed_max = (string) \PHP_INT_MAX;
}
$max_length = max(\strlen($retval), \strlen($signed_max));
$tmp1 = str_pad($retval, $max_length, '0', \STR_PAD_LEFT);
$tmp2 = str_pad($signed_max, $max_length, '0', \STR_PAD_LEFT);
if ($tmp1 > $tmp2) {
$retval = -1;
$overflow = true;
} elseif ($is_negative) {
$retval = '-'.$retval;
}
$retval = (int) $retval;
if ($digits_end === $digits) {
$message = sprintf(
'Invalid quantity "%s": no valid leading digits, interpreting as "0" for backwards compatibility',
self::escapeString($value)
);
trigger_error($message, \E_USER_WARNING);
return 0;
}
/* Allow for whitespace between integer portion and any suffix character */
while ($digits_end < $str_end && false !== strpos($ctype_space, $value[$digits_end])) {
++$digits_end;
}
/* No exponent suffix. */
if ($digits_end === $str_end) {
goto end;
}
switch ($value[$str_end - 1]) {
case 'g':
case 'G':
$shift = 30;
break;
case 'm':
case 'M':
$shift = 20;
break;
case 'k':
case 'K':
$shift = 10;
break;
default:
/* Unknown suffix */
$invalid = self::escapeString($value);
$interpreted = self::escapeString(substr($value, $str, $digits_end - $str));
$chr = self::escapeString($value[$str_end - 1]);
$message = sprintf(
'Invalid quantity "%s": unknown multiplier "%s", interpreting as "%s" for backwards compatibility',
$invalid,
$chr,
$interpreted
);
trigger_error($message, \E_USER_WARNING);
return $retval;
}
$factor = 1 << $shift;
if (!$overflow) {
if ($retval > 0) {
$overflow = $retval > \PHP_INT_MAX / $factor;
} else {
$overflow = $retval < \PHP_INT_MIN / $factor;
}
}
if (\is_float($retval * $factor)) {
$overflow = true;
$retval <<= $shift;
} else {
$retval *= $factor;
}
if ($digits_end !== $str_end - 1) {
/* More than one character in suffix */
$message = sprintf(
'Invalid quantity "%s", interpreting as "%s%s" for backwards compatibility',
self::escapeString($value),
self::escapeString(substr($value, $str, $digits_end - $str)),
self::escapeString($value[$str_end - 1])
);
trigger_error($message, \E_USER_WARNING);
return $retval;
}
end:
if ($overflow) {
/* Not specifying the resulting value here because the caller may make
* additional conversions. Not specifying the allowed range
* because the caller may do narrower range checks. */
$message = sprintf(
'Invalid quantity "%s": value is out of range, using overflow result for backwards compatibility',
self::escapeString($value)
);
trigger_error($message, \E_USER_WARNING);
}
return $retval;
}
/**
* Escape the string to avoid null bytes and to make non-printable chars visible.
*/
private static function escapeString(string $string): string
{
$escaped = '';
for ($n = 0, $len = \strlen($string); $n < $len; ++$n) {
$c = \ord($string[$n]);
if ($c < 32 || '\\' === $string[$n] || $c > 126) {
switch ($string[$n]) {
case "\n": $escaped .= '\\n'; break;
case "\r": $escaped .= '\\r'; break;
case "\t": $escaped .= '\\t'; break;
case "\f": $escaped .= '\\f'; break;
case "\v": $escaped .= '\\v'; break;
case '\\': $escaped .= '\\\\'; break;
case "\x1B": $escaped .= '\\e'; break;
default:
$escaped .= '\\x'.strtoupper(sprintf('%02x', $c));
}
} else {
$escaped .= $string[$n];
}
}
return $escaped;
}
}

File Metadata

Mime Type
text/x-php
Expires
Sat, May 16, 19:38 (3 h, 34 m)
Storage Engine
local-disk
Storage Format
Raw Data
Storage Handle
66/b2/8eecb24e0a03c66a8dbd9bbe4565
Default Alt Text
Php82.php (12 KB)

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