Make lower/upper casing locale independent

DEVSIX-9092

Autoported commit.
Original commit hash: [2501c0d]

Author: vitali-pr

itext.tests/itext.pdfocr.tesseract4.tests/itext/pdfocr/imageformats/ImageFormatIntegrationTest.cs

@@ -43,7 +43,7 @@ public abstract class ImageFormatIntegrationTest : IntegrationTestHelper {
 
         public ImageFormatIntegrationTest(IntegrationTestHelper.ReaderType type) {
             tesseractReader = GetTesseractReader(type);
-            this.testType = type.ToString().ToLowerInvariant();
+            this.testType = StringNormalizer.ToLowerCase(type.ToString());
         }
 
         [NUnit.Framework.SetUp]

itext/itext.pdfocr.tesseract4/itext/pdfocr/tesseract4/AbstractTesseract4OcrEngine.cs

@@ -355,7 +355,7 @@ public String DoImageOcr(FileInfo input, OutputFormat outputFormat) {
         /// <summary>Checks current os type.</summary>
         /// <returns>boolean true is current os is windows, otherwise - false</returns>
         public virtual bool IsWindows() {
-            return IdentifyOsType().ToLowerInvariant().Contains("win");
+            return StringNormalizer.ToLowerCase(IdentifyOsType()).Contains("win");
         }
 
         /// <summary>Identifies type of current OS and return it (win, linux).</summary>
@@ -366,7 +366,7 @@ public virtual bool IsWindows() {
         public virtual String IdentifyOsType() {
             String os = Environment.GetEnvironmentVariable("os.name") == null ? Environment.GetEnvironmentVariable("OS"
                 ) : Environment.GetEnvironmentVariable("os.name");
-            return os.ToLowerInvariant();
+            return StringNormalizer.ToLowerCase(os);
         }
 
         /// <summary>

itext/itext.pdfocr.tesseract4/itext/pdfocr/tesseract4/Tesseract4ExecutableOcrEngine.cs

@@ -412,7 +412,7 @@ private String GetExtension(FileInfo inputImage) {
                 if (index > 0) {
                     String extension = new String(inputImage.FullName.ToCharArray(), index, inputImage.FullName.Length - index
                         );
-                    return extension.ToLowerInvariant();
+                    return StringNormalizer.ToLowerCase(extension);
                 }
             }
             return ".png";

itext/itext.pdfocr.tesseract4/itext/pdfocr/tesseract4/Tesseract4OcrEngineProperties.cs

@@ -342,7 +342,7 @@ internal virtual iText.Pdfocr.Tesseract4.Tesseract4OcrEngineProperties SetUserWo
              inputStream) {
             SetPathToUserWordsFile(null);
             if (!GetLanguages().Contains(language)) {
-                if (DEFAULT_LANGUAGE.Equals(language.ToLowerInvariant())) {
+                if (DEFAULT_LANGUAGE.Equals(StringNormalizer.ToLowerCase(language))) {
                     IList<String> languagesList = GetLanguages();
                     languagesList.Add(language);
                     SetLanguages(languagesList);

port-hash

@@ -1 +1 @@
-78b9822d4fd19e4c404b571546cd23efa6ba1095
+2501c0de358f95308e52affb98db1719eae685a9