From b5130a81251d338be96e02134d6fca7c00229e07 Mon Sep 17 00:00:00 2001
From: Heinrich Schuchardt <xypron.glpk@gmx.de>
Date: Tue, 4 Sep 2018 19:34:56 +0200
Subject: lib: charset: upper/lower case conversion

Provide functions for upper and lower case conversion.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Signed-off-by: Alexander Graf <agraf@suse.de>
---
 lib/charset.c | 47 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 47 insertions(+)

(limited to 'lib/charset.c')

diff --git a/lib/charset.c b/lib/charset.c
index 39c8329830..72c808ce64 100644
--- a/lib/charset.c
+++ b/lib/charset.c
@@ -6,8 +6,18 @@
  */
 
 #include <charset.h>
+#include <capitalization.h>
 #include <malloc.h>
 
+static struct capitalization_table capitalization_table[] =
+#ifdef CONFIG_EFI_UNICODE_CAPITALIZATION
+	UNICODE_CAPITALIZATION_TABLE;
+#elif CONFIG_FAT_DEFAULT_CODEPAGE == 1250
+	CP1250_CAPITALIZATION_TABLE;
+#else
+	CP437_CAPITALIZATION_TABLE;
+#endif
+
 s32 utf8_get(const char **src)
 {
 	s32 code = 0;
@@ -241,6 +251,43 @@ int utf16_utf8_strncpy(char **dst, const u16 *src, size_t count)
 	return 0;
 }
 
+s32 utf_to_lower(const s32 code)
+{
+	struct capitalization_table *pos = capitalization_table;
+	s32 ret = code;
+
+	if (code <= 0x7f) {
+		if (code >= 'A' && code <= 'Z')
+			ret += 0x20;
+		return ret;
+	}
+	for (; pos->upper; ++pos) {
+		if (pos->upper == code) {
+			ret = pos->lower;
+			break;
+		}
+	}
+	return ret;
+}
+
+s32 utf_to_upper(const s32 code)
+{
+	struct capitalization_table *pos = capitalization_table;
+	s32 ret = code;
+
+	if (code <= 0x7f) {
+		if (code >= 'a' && code <= 'z')
+			ret -= 0x20;
+		return ret;
+	}
+	for (; pos->lower; ++pos) {
+		if (pos->lower == code) {
+			ret = pos->upper;
+			break;
+		}
+	}
+	return ret;
+}
 
 size_t u16_strlen(const u16 *in)
 {
-- 
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