1 files changed, 49 insertions, 0 deletions
diff --git a/unicode/unicode_tablookup.c b/unicode/unicode_tablookup.c
new file mode 100644
index 0000000..c61526d
--- /dev/null
+++ b/unicode/unicode_tablookup.c
@@ -0,0 +1,49 @@
+/*
+** Copyright 2011 Double Precision, Inc.
+** See COPYING for distribution information.
+**
+*/
+
+#include	"unicode_config.h"
+#include	"unicode.h"
+
+#define BLOCK_SIZE	256
+
+uint8_t unicode_tab_lookup(unicode_char ch,
+			   const size_t *unicode_indextab,
+			   size_t unicode_indextab_sizeof,
+			   const uint8_t (*unicode_rangetab)[2],
+			   const uint8_t *unicode_classtab,
+			   uint8_t uclass)
+{
+	size_t cl=ch / BLOCK_SIZE;
+
+	if (cl < unicode_indextab_sizeof-1)
+	{
+		const size_t start_pos=unicode_indextab[cl];
+		const uint8_t (*p)[2]=unicode_rangetab + start_pos;
+		size_t b=0, e=unicode_indextab[cl+1] - start_pos;
+		uint8_t chmodcl= ch & (BLOCK_SIZE-1);
+
+		while (b < e)
+		{
+			size_t n=b + (e-b)/2;
+
+			if (chmodcl >= p[n][0])
+			{
+				if (chmodcl <= p[n][1])
+				{
+					uclass=unicode_classtab[start_pos+n];
+					break;
+				}
+				b=n+1;
+			}
+			else
+			{
+				e=n;
+			}
+		}
+	}
+
+	return uclass;
+}