diff options
| author | Heinrich Schuchardt <xypron.glpk@gmx.de> | 2017-10-09 21:09:05 +0200 |
|---|---|---|
| committer | Alexander Graf <agraf@suse.de> | 2017-10-10 10:01:27 +0200 |
| commit | 984f251feeb932cfe551cbd62c5f7f5e073b6cc3 (patch) | |
| tree | e89009a68b9cfde6ac80bf4042d221807bab5c1f /include/charset.h | |
| parent | 16a73b249d138fedeb188710533902ed7aac1ddc (diff) | |
efi_loader: MAX_UTF8_PER_UTF16 = 3
The constant MAX_UTF8_PER_UTF16 is used to calculate
required memory when converting from UTF-16 to UTF-8.
If this constant is too big we waste memory.
A code point encoded by one UTF-16 symbol is converted to a
maximum of three UTF-8 symbols, e.g.
0xffff could be encoded as 0xef 0xbf 0xbf.
The first byte carries four bits, the second and third byte
carry six bits each.
A code point encoded by two UTF-16 symbols is converted to four
UTF-8 symbols.
So in this case we need a maximum of two UTF-8 symbols per
UTF-16 symbol.
As the overall maximum is three UTF-8 symobls per UTF-16 symbol
we need MAX_UTF8_PER_UTF16 = 3.
Fixes: 78178bb0c9d lib: add some utf16 handling helpers
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Signed-off-by: Alexander Graf <agraf@suse.de>
Diffstat (limited to 'include/charset.h')
| -rw-r--r-- | include/charset.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/include/charset.h b/include/charset.h index 39279f746a..37a3278499 100644 --- a/include/charset.h +++ b/include/charset.h @@ -9,7 +9,7 @@ #ifndef __CHARSET_H_ #define __CHARSET_H_ -#define MAX_UTF8_PER_UTF16 4 +#define MAX_UTF8_PER_UTF16 3 /** * utf16_strlen() - Get the length of an utf16 string @@ -52,7 +52,7 @@ uint16_t *utf16_strdup(const uint16_t *s); * Converts 'size' characters of the utf16 string 'src' to utf8 * written to the 'dest' buffer. * - * NOTE that a single utf16 character can generate up to 4 utf8 + * NOTE that a single utf16 character can generate up to 3 utf8 * characters. See MAX_UTF8_PER_UTF16. * * @dest the destination buffer to write the utf8 characters |