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(UTF) Small optimizations

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This commit is contained in:
twinaphex 2019-04-27 00:45:59 +02:00
parent f4f1212372
commit 5c3d340e01
2 changed files with 68 additions and 74 deletions
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108
libretro-common/encodings/encoding_utf.c
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@ -211,10 +211,7 @@ size_t utf8len(const char *string)
return ret;
}
static uint8_t utf8_walkbyte(const char **string)
{
return *((*string)++);
}
#define utf8_walkbyte(string) (*((*(string))++))
/* Does not validate the input, returns garbage if it's not UTF-8. */
uint32_t utf8_walk(const char **string)
@ -227,14 +224,16 @@ uint32_t utf8_walk(const char **string)
ret = (ret << 6) | (utf8_walkbyte(string) & 0x3F);
if (first >= 0xE0)
{
ret = (ret << 6) | (utf8_walkbyte(string) & 0x3F);
if (first >= 0xF0)
{
ret = (ret << 6) | (utf8_walkbyte(string) & 0x3F);
if (first >= 0xF0)
return ret | (first & 7) << 18;
if (first >= 0xE0)
}
return ret | (first & 15) << 12;
}
return ret | (first & 31) << 6;
}
@ -273,6 +272,7 @@ bool utf16_to_char_string(const uint16_t *in, char *s, size_t len)
return ret;
}
#if defined(_WIN32) && !defined(_XBOX) && !defined(UNICODE)
/* Returned pointer MUST be freed by the caller if non-NULL. */
static char *mb_to_mb_string_alloc(const char *str,
enum CodePage cp_in, enum CodePage cp_out)
@ -280,30 +280,17 @@ static char* mb_to_mb_string_alloc(const char *str,
char *path_buf = NULL;
wchar_t *path_buf_wide = NULL;
int path_buf_len = 0;
int path_buf_wide_len = 0;
int path_buf_wide_len = MultiByteToWideChar(cp_in, 0, str, -1, NULL, 0);
if (!str || !*str)
return NULL;
(void)path_buf;
(void)path_buf_wide;
(void)path_buf_len;
(void)path_buf_wide_len;
#if !defined(_WIN32) || defined(_XBOX)
/* assume string needs no modification if not on Windows */
return strdup(str);
#else
#ifdef UNICODE
/* TODO/FIXME: Not implemented. */
return strdup(str);
#else
/* Windows 95 will return 0 from these functions with a UTF8 codepage set without MSLU. From an unknown MSDN version (others omit this info):
* - CP_UTF8 Windows 98/Me, Windows NT 4.0 and later: Translate using UTF-8. When this is set, dwFlags must be zero.
* - Windows 95: Under the Microsoft Layer for Unicode, MultiByteToWideChar also supports CP_UTF7 and CP_UTF8.
/* Windows 95 will return 0 from these functions with
* a UTF8 codepage set without MSLU.
*
* From an unknown MSDN version (others omit this info):
* - CP_UTF8 Windows 98/Me, Windows NT 4.0 and later:
* Translate using UTF-8. When this is set, dwFlags must be zero.
* - Windows 95: Under the Microsoft Layer for Unicode,
* MultiByteToWideChar also supports CP_UTF7 and CP_UTF8.
*/
path_buf_wide_len = MultiByteToWideChar(cp_in, 0, str, -1, NULL, 0);
if (path_buf_wide_len)
{
@ -355,20 +342,37 @@ static char* mb_to_mb_string_alloc(const char *str,
free(path_buf_wide);
return NULL;
#endif
#endif
}
#endif
/* Returned pointer MUST be freed by the caller if non-NULL. */
char* utf8_to_local_string_alloc(const char *str)
{
if (str && *str)
{
#if defined(_WIN32) && !defined(_XBOX) && !defined(UNICODE)
return mb_to_mb_string_alloc(str, CODEPAGE_UTF8, CODEPAGE_LOCAL);
#else
/* assume string needs no modification if not on Windows */
return strdup(str);
#endif
}
return NULL;
}
/* Returned pointer MUST be freed by the caller if non-NULL. */
char* local_to_utf8_string_alloc(const char *str)
{
if (str && *str)
{
#if defined(_WIN32) && !defined(_XBOX) && !defined(UNICODE)
return mb_to_mb_string_alloc(str, CODEPAGE_LOCAL, CODEPAGE_UTF8);
#else
/* assume string needs no modification if not on Windows */
return strdup(str);
#endif
}
return NULL;
}
/* Returned pointer MUST be freed by the caller if non-NULL. */
@ -448,10 +452,8 @@ char* utf16_to_utf8_string_alloc(const wchar_t *str)
{
#ifdef _WIN32
int len = 0;
int out_len = 0;
#else
size_t len = 0;
size_t out_len = 0;
#endif
char *buf = NULL;
@ -459,40 +461,34 @@ char* utf16_to_utf8_string_alloc(const wchar_t *str)
return NULL;
#ifdef _WIN32
len = WideCharToMultiByte(CP_UTF8, 0, str, -1, NULL, 0, NULL, NULL);
if (len)
{
buf = (char*)calloc(len, sizeof(char));
UINT code_page = CP_UTF8;
len = WideCharToMultiByte(code_page,
0, str, -1, NULL, 0, NULL, NULL);
if (!buf)
return NULL;
out_len = WideCharToMultiByte(CP_UTF8, 0, str, -1, buf, len, NULL, NULL);
}
else
{
/* fallback to ANSI codepage instead */
len = WideCharToMultiByte(CP_ACP, 0, str, -1, NULL, 0, NULL, NULL);
if (len)
if (!len)
{
code_page = CP_ACP;
len = WideCharToMultiByte(code_page,
0, str, -1, NULL, 0, NULL, NULL);
}
buf = (char*)calloc(len, sizeof(char));
if (!buf)
return NULL;
out_len = WideCharToMultiByte(CP_ACP, 0, str, -1, buf, len, NULL, NULL);
}
}
if (out_len < 0)
if (WideCharToMultiByte(code_page,
0, str, -1, buf, len, NULL, NULL) < 0)
{
free(buf);
return NULL;
}
}
#else
/* NOTE: For now, assume non-Windows platforms' locale is already UTF-8. */
/* NOTE: For now, assume non-Windows platforms'
* locale is already UTF-8. */
len = wcstombs(NULL, str, 0) + 1;
if (len)
@ -502,14 +498,12 @@ char* utf16_to_utf8_string_alloc(const wchar_t *str)
if (!buf)
return NULL;
out_len = wcstombs(buf, str, len);
}
if (out_len == (size_t)-1)
if (wcstombs(buf, str, len) == (size_t)-1)
{
free(buf);
return NULL;
}
}
#endif
return buf;