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system/ThirdParty/Kint/Zval/BlobValue.php

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+<?php
+
+/*
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2013 Jonathan Vollebregt (jnvsor@gmail.com), Rokas Šleinius (raveren@gmail.com)
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+namespace Kint\Zval;
+
+class BlobValue extends Value
+{
+    /**
+     * @var array Character encodings to detect
+     *
+     * @see https://secure.php.net/function.mb-detect-order
+     *
+     * In practice, mb_detect_encoding can only successfully determine the
+     * difference between the following common charsets at once without
+     * breaking things for one of the other charsets:
+     * - ASCII
+     * - UTF-8
+     * - SJIS
+     * - EUC-JP
+     *
+     * The order of the charsets is significant. If you put UTF-8 before ASCII
+     * it will never match ASCII, because UTF-8 is a superset of ASCII.
+     * Similarly, SJIS and EUC-JP frequently match UTF-8 strings, so you should
+     * check UTF-8 first. SJIS and EUC-JP seem to work either way, but SJIS is
+     * more common so it should probably be first.
+     *
+     * While you're free to experiment with other charsets, remember to keep
+     * this behavior in mind when setting up your char_encodings array.
+     *
+     * This depends on the mbstring extension
+     */
+    public static $char_encodings = [
+        'ASCII',
+        'UTF-8',
+    ];
+
+    /**
+     * @var array Legacy character encodings to detect
+     *
+     * @see https://secure.php.net/function.iconv
+     *
+     * Assuming the other encoding checks fail, this will perform a
+     * simple iconv conversion to check for invalid bytes. If any are
+     * found it will not match.
+     *
+     * This can be useful for ambiguous single byte encodings like
+     * windows-125x and iso-8859-x which have practically undetectable
+     * differences because they use every single byte available.
+     *
+     * This is *NOT* reliable and should not be trusted implicitly. As
+     * with char_encodings, the order of the charsets is significant.
+     *
+     * This depends on the iconv extension
+     */
+    public static $legacy_encodings = [];
+
+    public $type = 'string';
+    public $encoding = false;
+    public $hints = ['string'];
+
+    public function getType()
+    {
+        if (false === $this->encoding) {
+            return 'binary '.$this->type;
+        }
+
+        if ('ASCII' === $this->encoding) {
+            return $this->type;
+        }
+
+        return $this->encoding.' '.$this->type;
+    }
+
+    public function getValueShort()
+    {
+        if ($rep = $this->value) {
+            return '"'.$rep->contents.'"';
+        }
+    }
+
+    public function transplant(Value $old)
+    {
+        parent::transplant($old);
+
+        if ($old instanceof self) {
+            $this->encoding = $old->encoding;
+        }
+    }
+
+    public static function strlen($string, $encoding = false)
+    {
+        if (\function_exists('mb_strlen')) {
+            if (false === $encoding) {
+                $encoding = self::detectEncoding($string);
+            }
+
+            if ($encoding && 'ASCII' !== $encoding) {
+                return \mb_strlen($string, $encoding);
+            }
+        }
+
+        return \strlen($string);
+    }
+
+    public static function substr($string, $start, $length = null, $encoding = false)
+    {
+        if (\function_exists('mb_substr')) {
+            if (false === $encoding) {
+                $encoding = self::detectEncoding($string);
+            }
+
+            if ($encoding && 'ASCII' !== $encoding) {
+                return \mb_substr($string, $start, $length, $encoding);
+            }
+        }
+
+        // Special case for substr/mb_substr discrepancy
+        if ('' === $string) {
+            return '';
+        }
+
+        return \substr($string, $start, isset($length) ? $length : PHP_INT_MAX);
+    }
+
+    public static function detectEncoding($string)
+    {
+        if (\function_exists('mb_detect_encoding')) {
+            if ($ret = \mb_detect_encoding($string, self::$char_encodings, true)) {
+                return $ret;
+            }
+        }
+
+        // Pretty much every character encoding uses first 32 bytes as control
+        // characters. If it's not a multi-byte format it's safe to say matching
+        // any control character besides tab, nl, and cr means it's binary.
+        if (\preg_match('/[\\x00-\\x08\\x0B\\x0C\\x0E-\\x1F]/', $string)) {
+            return false;
+        }
+
+        if (\function_exists('iconv')) {
+            foreach (self::$legacy_encodings as $encoding) {
+                if (@\iconv($encoding, $encoding, $string) === $string) {
+                    return $encoding;
+                }
+            }
+        } elseif (!\function_exists('mb_detect_encoding')) { // @codeCoverageIgnore
+            // If a user has neither mb_detect_encoding, nor iconv, nor the
+            // polyfills, there's not much we can do about it...
+            // Pretend it's ASCII and pray the browser renders it properly.
+            return 'ASCII'; // @codeCoverageIgnore
+        }
+
+        return false;
+    }
+}