NLS: improve UTF8 -> UTF16 string conversion routine

[pandora-kernel.git] / include / linux / nls.h

diff --git a/include/linux/nls.h b/include/linux/nls.h
index 52b1a76..5dc635f 100644 (file)
--- a/include/linux/nls.h
+++ b/include/linux/nls.h
@@ -3,8 +3,23 @@
 
 #include <linux/init.h>
 
-/* unicode character */
-typedef __u16 wchar_t;
+/* Unicode has changed over the years.  Unicode code points no longer
+ * fit into 16 bits; as of Unicode 5 valid code points range from 0
+ * to 0x10ffff (17 planes, where each plane holds 65536 code points).
+ *
+ * The original decision to represent Unicode characters as 16-bit
+ * wchar_t values is now outdated.  But plane 0 still includes the
+ * most commonly used characters, so we will retain it.  The newer
+ * 32-bit unicode_t type can be used when it is necessary to
+ * represent the full Unicode character set.
+ */
+
+/* Plane-0 Unicode character */
+typedef u16 wchar_t;
+#define MAX_WCHAR_T    0xffff
+
+/* Arbitrary Unicode character */
+typedef u32 unicode_t;
 
 struct nls_table {
        const char *charset;
@@ -21,17 +36,26 @@ struct nls_table {
 /* this value hold the maximum octet of charset */
 #define NLS_MAX_CHARSET_SIZE 6 /* for UTF-8 */
 
-/* nls.c */
+/* Byte order for UTF-16 strings */
+enum utf16_endian {
+       UTF16_HOST_ENDIAN,
+       UTF16_LITTLE_ENDIAN,
+       UTF16_BIG_ENDIAN
+};
+
+/* nls_base.c */
 extern int register_nls(struct nls_table *);
 extern int unregister_nls(struct nls_table *);
 extern struct nls_table *load_nls(char *);
 extern void unload_nls(struct nls_table *);
 extern struct nls_table *load_nls_default(void);
 
-extern int utf8_mbtowc(wchar_t *, const __u8 *, int);
-extern int utf8_mbstowcs(wchar_t *, const __u8 *, int);
-extern int utf8_wctomb(__u8 *, wchar_t, int);
-extern int utf8_wcstombs(__u8 *, const wchar_t *, int);
+extern int utf8_to_utf32(const u8 *s, int len, unicode_t *pu);
+extern int utf32_to_utf8(unicode_t u, u8 *s, int maxlen);
+extern int utf8s_to_utf16s(const u8 *s, int len,
+               enum utf16_endian endian, wchar_t *pwcs, int maxlen);
+extern int utf16s_to_utf8s(const wchar_t *pwcs, int len,
+               enum utf16_endian endian, u8 *s, int maxlen);
 
 static inline unsigned char nls_tolower(struct nls_table *t, unsigned char c)
 {