From 8f930126e7de6db9c22ff9f02d52564c4c99a9a8 Mon Sep 17 00:00:00 2001
From: Jaromir Wysoglad
Date: Thu, 5 Sep 2019 02:51:10 +0200
Subject: COMMON: Add string size computation to Encoding.

---
 common/encoding.cpp | 16 ++++++++++++++++
 common/encoding.h   | 12 ++++++++++++
 2 files changed, 28 insertions(+)

(limited to 'common')

diff --git a/common/encoding.cpp b/common/encoding.cpp
index fc743e5119..3c70f19334 100644
--- a/common/encoding.cpp
+++ b/common/encoding.cpp
@@ -499,4 +499,20 @@ uint32 *Encoding::transliterateUTF32(const uint32 *string, size_t length) {
 	return result;
 }
 
+size_t Encoding::stringLength(const char *string, const String &encoding) {
+	if (encoding.hasPrefixIgnoreCase("UTF-16")) {
+		const uint16 *i = (const uint16 *) string;
+		for (;*i != 0; i++) {}
+		return (const char *) i - string;
+	} else if (encoding.hasPrefixIgnoreCase("UTF-32")) {
+		const uint32 *i = (const uint32 *) string;
+		for (;*i != 0; i++) {}
+		return (const char *) i - string;
+	} else {
+		const char *i = string;
+		for (;*i != 0; i++) {}
+		return i - string;
+	}
+}
+
 }
diff --git a/common/encoding.h b/common/encoding.h
index 2b079ad962..adb61191d1 100644
--- a/common/encoding.h
+++ b/common/encoding.h
@@ -108,6 +108,18 @@ class Encoding {
 		 * @return Array of characters with the opposite endianity
 		 */
 		static char *switchEndian(const char *string, int length, int bitCount);
+
+		/**
+		 * Computes length (in bytes) of a string in a given encoding. 
+		 * The string must be zero ended. Similar to strlen
+		 * (could be used instead of strlen).
+		 *
+		 * @param string String, which size should be computed.
+		 * @param encoding Encoding of the string.
+		 *
+		 * @return Size of the string in bytes.
+		 */
+		static size_t stringLength(const char *string, const String &encoding);
 	
 	private:
 		/** The encoding, which is currently being converted to */
-- 
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