From 46f9fd7509eaa2809392acf3a264b57a2daf973c Mon Sep 17 00:00:00 2001
From: Neil <nyamatongwe@gmail.com>
Date: Mon, 12 Jun 2017 11:49:56 +1000
Subject: Removed unused functions and methods from Platform.h. Replaced
 Platform::Clamp with Sci::clamp but will later change this to std::clamp once
 on full C++17 compilers. Drop MouseButtonBounce workaround for very early
 GTK+/Linux.

---
 src/DBCS.cxx | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 48 insertions(+)
 create mode 100644 src/DBCS.cxx

(limited to 'src/DBCS.cxx')

diff --git a/src/DBCS.cxx b/src/DBCS.cxx
new file mode 100644
index 000000000..46cee8e69
--- /dev/null
+++ b/src/DBCS.cxx
@@ -0,0 +1,48 @@
+// Scintilla source code edit control
+/** @file DBCS.cxx
+ ** Functions to handle DBCS double byte encodings like Shift-JIS.
+ **/
+// Copyright 2017 by Neil Hodgson <neilh@scintilla.org>
+// The License.txt file describes the conditions under which this software may be distributed.
+
+#include "DBCS.h"
+
+#ifdef SCI_NAMESPACE
+using namespace Scintilla;
+#endif
+
+#ifdef SCI_NAMESPACE
+namespace Scintilla {
+#endif
+
+bool DBCSIsLeadByte(int codePage, char ch) {
+	// Byte ranges found in Wikipedia articles with relevant search strings in each case
+	const unsigned char uch = static_cast<unsigned char>(ch);
+	switch (codePage) {
+	case 932:
+		// Shift_jis
+		return ((uch >= 0x81) && (uch <= 0x9F)) ||
+			((uch >= 0xE0) && (uch <= 0xFC));
+		// Lead bytes F0 to FC may be a Microsoft addition.
+	case 936:
+		// GBK
+		return (uch >= 0x81) && (uch <= 0xFE);
+	case 949:
+		// Korean Wansung KS C-5601-1987
+		return (uch >= 0x81) && (uch <= 0xFE);
+	case 950:
+		// Big5
+		return (uch >= 0x81) && (uch <= 0xFE);
+	case 1361:
+		// Korean Johab KS C-5601-1992
+		return
+			((uch >= 0x84) && (uch <= 0xD3)) ||
+			((uch >= 0xD8) && (uch <= 0xDE)) ||
+			((uch >= 0xE0) && (uch <= 0xF9));
+	}
+	return false;
+}
+
+#ifdef SCI_NAMESPACE
+}
+#endif
-- 
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