From: Timo Sirainen <tss@iki.fi>
Date: Sat, 1 Nov 2008 19:07:12 +0000 (+0200)
Subject: Added some UTF16_ macros for helping UTF-16 conversions.
X-Git-Tag: 1.2.alpha4~111
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=0b2b090cdc3d36f30d6d2ec99b35ac0b7657d538;p=thirdparty%2Fdovecot%2Fcore.git

Added some UTF16_ macros for helping UTF-16 conversions.

--HG--
branch : HEAD
---

diff --git a/src/lib/unichar.h b/src/lib/unichar.h
index 3039c391b1..73a1c5439e 100644
--- a/src/lib/unichar.h
+++ b/src/lib/unichar.h
@@ -4,6 +4,24 @@
 /* Character used to replace invalid input. */
 #define UNICODE_REPLACEMENT_CHAR 0xfffd
 
+/* Characters >= base require surrogates */
+#define UTF16_SURROGATE_BASE 0x10000
+
+#define UTF16_SURROGATE_SHIFT 10
+#define UTF16_SURROGATE_MASK 0x03ff
+#define UTF16_SURROGATE_HIGH_FIRST 0xd800
+#define UTF16_SURROGATE_HIGH_LAST 0xdbff
+#define UTF16_SURROGATE_HIGH_MAX 0xdfff
+#define UTF16_SURROGATE_LOW_FIRST 0xdc00
+#define UTF16_SURROGATE_LOW_LAST 0xdfff
+
+#define UTF16_SURROGATE_HIGH(chr) \
+	(UTF16_SURROGATE_HIGH_FIRST + \
+	 (((chr) - UTF16_SURROGATE_BASE) >> UTF16_SURROGATE_SHIFT))
+#define UTF16_SURROGATE_LOW(chr) \
+	(UTF16_SURROGATE_LOW_FIRST + \
+	 (((chr) - UTF16_SURROGATE_BASE) & UTF16_SURROGATE_MASK))
+
 typedef uint32_t unichar_t;
 ARRAY_DEFINE_TYPE(unichars, unichar_t);