Fix iconv unsupported `//IGNORE//TRANSLIT` on IBM i

Fixes #791

CHANGELOG.md

@@ -26,6 +26,7 @@ and this project adheres to [Semantic Versioning](https://semver.org).
 - Fix color from CSS when reading from HTML - [#831](https://github.com/PHPOffice/PhpSpreadsheet/pull/831) 
 - Fix infinite loop when reading invalid ODS files - [#832](https://github.com/PHPOffice/PhpSpreadsheet/pull/832) 
 - Fix time format for duration is incorrect - [#666](https://github.com/PHPOffice/PhpSpreadsheet/pull/666)
+- Fix iconv unsupported `//IGNORE//TRANSLIT` on IBM i - [#791](https://github.com/PHPOffice/PhpSpreadsheet/issues/791)
 
 ## [1.5.2] - 2018-11-25
 

composer.json

@@ -44,6 +44,7 @@
         "ext-dom": "*",
         "ext-gd": "*",
         "ext-iconv": "*",
+        "ext-fileinfo": "*",
         "ext-libxml": "*",
         "ext-mbstring": "*",
         "ext-SimpleXML": "*",

composer.lock

@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "5e66d1016f24ad7d6495ed4d7a04234d",
+    "content-hash": "d70247696f417581626dde9641b53bdc",
     "packages": [
         {
             "name": "markbaker/complex",
@@ -3197,6 +3197,7 @@
         "ext-dom": "*",
         "ext-gd": "*",
         "ext-iconv": "*",
+        "ext-fileinfo": "*",
         "ext-libxml": "*",
         "ext-mbstring": "*",
         "ext-simplexml": "*",

src/PhpSpreadsheet/Shared/StringHelper.php

@@ -53,6 +53,13 @@ class StringHelper
      */
     private static $isIconvEnabled;
 
+    /**
+     * iconv options.
+     *
+     * @var string
+     */
+    private static $iconvOptions = '//IGNORE//TRANSLIT';
+
     /**
      * Build control characters array.
      */
@@ -243,39 +250,26 @@ class StringHelper
             return self::$isIconvEnabled;
         }
 
+        // Assume no problems with iconv
+        self::$isIconvEnabled = true;
+
         // Fail if iconv doesn't exist
         if (!function_exists('iconv')) {
             self::$isIconvEnabled = false;
-
-            return false;
-        }
-
-        // Sometimes iconv is not working, and e.g. iconv('UTF-8', 'UTF-16LE', 'x') just returns false,
-        if (!@iconv('UTF-8', 'UTF-16LE', 'x')) {
+        } elseif (!@iconv('UTF-8', 'UTF-16LE', 'x')) {
+            // Sometimes iconv is not working, and e.g. iconv('UTF-8', 'UTF-16LE', 'x') just returns false,
             self::$isIconvEnabled = false;
-
-            return false;
-        }
-
-        // Sometimes iconv_substr('A', 0, 1, 'UTF-8') just returns false in PHP 5.2.0
-        // we cannot use iconv in that case either (http://bugs.php.net/bug.php?id=37773)
-        if (!@iconv_substr('A', 0, 1, 'UTF-8')) {
+        } elseif (defined('PHP_OS') && @stristr(PHP_OS, 'AIX') && defined('ICONV_IMPL') && (@strcasecmp(ICONV_IMPL, 'unknown') == 0) && defined('ICONV_VERSION') && (@strcasecmp(ICONV_VERSION, 'unknown') == 0)) {
+            // CUSTOM: IBM AIX iconv() does not work
             self::$isIconvEnabled = false;
-
-            return false;
         }
 
-        // CUSTOM: IBM AIX iconv() does not work
-        if (defined('PHP_OS') && @stristr(PHP_OS, 'AIX') && defined('ICONV_IMPL') && (@strcasecmp(ICONV_IMPL, 'unknown') == 0) && defined('ICONV_VERSION') && (@strcasecmp(ICONV_VERSION, 'unknown') == 0)) {
-            self::$isIconvEnabled = false;
-
-            return false;
+        // Deactivate iconv default options if they fail (as seen on IMB i)
+        if (self::$isIconvEnabled && !@iconv('UTF-8', 'UTF-16LE' . self::$iconvOptions, 'x')) {
+            self::$iconvOptions = '';
         }
 
-        // If we reach here no problems were detected with iconv
-        self::$isIconvEnabled = true;
-
-        return true;
+        return self::$isIconvEnabled;
     }
 
     private static function buildCharacterSets()
@@ -453,7 +447,7 @@ class StringHelper
     public static function convertEncoding($value, $to, $from)
     {
         if (self::getIsIconvEnabled()) {
-            $result = iconv($from, $to . '//IGNORE//TRANSLIT', $value);
+            $result = iconv($from, $to . self::$iconvOptions, $value);
             if (false !== $result) {
                 return $result;
             }