From 147fea4aa8f74c72086ee3d416e24982bd8b3a52 Mon Sep 17 00:00:00 2001
From: nyamatongwe <unknown>
Date: Sat, 4 Jun 2011 21:14:10 +1000
Subject: Included DBCS support.

---
 cocoa/PlatCocoa.mm | 25 ++++++++++++++++++++++++-
 1 file changed, 24 insertions(+), 1 deletion(-)

(limited to 'cocoa')

diff --git a/cocoa/PlatCocoa.mm b/cocoa/PlatCocoa.mm
index 80cc5a43b..a9ac95461 100644
--- a/cocoa/PlatCocoa.mm
+++ b/cocoa/PlatCocoa.mm
@@ -1863,7 +1863,30 @@ long Platform::SendScintillaPointer(WindowID w, unsigned int msg, unsigned long
 
 bool Platform::IsDBCSLeadByte(int codePage, char ch)
 {
-  // No support for DBCS.
+  // Byte ranges found in Wikipedia articles with relevant search strings in each case
+  unsigned char uch = static_cast<unsigned char>(ch);
+  switch (codePage)
+  {
+  case 932:
+    // Shift_jis
+    return ((uch >= 0x81) && (uch <= 0x9F)) ||
+        ((uch >= 0xE0) && (uch <= 0xEF));
+  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;
 }
 
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