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Replace g_utf8_validate() with an optimized version, and clarify the docs

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2004-11-24  Matthias Clasen  <mclasen@redhat.com>

	* glib/gutf8.c: Replace g_utf8_validate() with an
	optimized version, and clarify the docs a bit.  (#159131,
	Owen Taylor)
This commit is contained in:
Matthias Clasen 2004-11-24 17:58:21 +00:00 committed by Matthias Clasen
parent b8d9e050a4
commit 40fb4cff10
6 changed files with 187 additions and 52 deletions
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4
ChangeLog
View File

@ -1,5 +1,9 @@
2004-11-24 Matthias Clasen <mclasen@redhat.com>
* glib/gutf8.c: Replace g_utf8_validate() with an
optimized version, and clarify the docs a bit. (#159131,
Owen Taylor)
* tests/Makefile.am (test_programs): Add utf8-validate.
* tests/utf8-validate.c: Unit tests for g_utf8_validate().

4
ChangeLog.pre-2-10
View File

@ -1,5 +1,9 @@
2004-11-24 Matthias Clasen <mclasen@redhat.com>
* glib/gutf8.c: Replace g_utf8_validate() with an
optimized version, and clarify the docs a bit. (#159131,
Owen Taylor)
* tests/Makefile.am (test_programs): Add utf8-validate.
* tests/utf8-validate.c: Unit tests for g_utf8_validate().

4
ChangeLog.pre-2-12
View File

@ -1,5 +1,9 @@
2004-11-24 Matthias Clasen <mclasen@redhat.com>
* glib/gutf8.c: Replace g_utf8_validate() with an
optimized version, and clarify the docs a bit. (#159131,
Owen Taylor)
* tests/Makefile.am (test_programs): Add utf8-validate.
* tests/utf8-validate.c: Unit tests for g_utf8_validate().

4
ChangeLog.pre-2-6
View File

@ -1,5 +1,9 @@
2004-11-24 Matthias Clasen <mclasen@redhat.com>
* glib/gutf8.c: Replace g_utf8_validate() with an
optimized version, and clarify the docs a bit. (#159131,
Owen Taylor)
* tests/Makefile.am (test_programs): Add utf8-validate.
* tests/utf8-validate.c: Unit tests for g_utf8_validate().

4
ChangeLog.pre-2-8
View File

@ -1,5 +1,9 @@
2004-11-24 Matthias Clasen <mclasen@redhat.com>
* glib/gutf8.c: Replace g_utf8_validate() with an
optimized version, and clarify the docs a bit. (#159131,
Owen Taylor)
* tests/Makefile.am (test_programs): Add utf8-validate.
* tests/utf8-validate.c: Unit tests for g_utf8_validate().

219
glib/gutf8.c
View File

@ -1511,19 +1511,171 @@ g_ucs4_to_utf16 (const gunichar *str,
return result;
}
#define CONTINUATION_CHAR \
G_STMT_START { \
if ((*(guchar *)p & 0xc0) != 0x80) /* 10xxxxxx */ \
goto error; \
val <<= 6; \
val |= (*(guchar *)p) & 0x3f; \
} G_STMT_END
static const gchar *
fast_validate (const char *str)
{
gunichar val = 0;
gunichar min = 0;
const gchar *p;
for (p = str; *p; p++)
{
if (*(guchar *)p < 128)
/* done */;
else
{
const gchar *last;
last = p;
if ((*(guchar *)p & 0xe0) == 0xc0) /* 110xxxxx */
{
if (G_UNLIKELY ((*(guchar *)p & 0x1e) == 0))
goto error;
p++;
if (G_UNLIKELY ((*(guchar *)p & 0xc0) != 0x80)) /* 10xxxxxx */
goto error;
}
else
{
if ((*(guchar *)p & 0xf0) == 0xe0) /* 1110xxxx */
{
min = (1 << 11);
val = *(guchar *)p & 0x0f;
goto TWO_REMAINING;
}
else if ((*(guchar *)p & 0xf8) == 0xf0) /* 11110xxx */
{
min = (1 << 16);
val = *(guchar *)p & 0x07;
}
else
goto error;
p++;
CONTINUATION_CHAR;
TWO_REMAINING:
p++;
CONTINUATION_CHAR;
p++;
CONTINUATION_CHAR;
if (G_UNLIKELY (val < min))
goto error;
if (G_UNLIKELY (!UNICODE_VALID(val)))
goto error;
}
continue;
error:
return last;
}
}
return p;
}
static const gchar *
fast_validate_len (const char *str,
gssize max_len)
{
gunichar val = 0;
gunichar min = 0;
const gchar *p;
for (p = str; (max_len < 0 || (p - str) < max_len) && *p; p++)
{
if (*(guchar *)p < 128)
/* done */;
else
{
const gchar *last;
last = p;
if ((*(guchar *)p & 0xe0) == 0xc0) /* 110xxxxx */
{
if (G_UNLIKELY (max_len >= 0 && max_len - (p - str) < 2))
goto error;
if (G_UNLIKELY ((*(guchar *)p & 0x1e) == 0))
goto error;
p++;
if (G_UNLIKELY ((*(guchar *)p & 0xc0) != 0x80)) /* 10xxxxxx */
goto error;
}
else
{
if ((*(guchar *)p & 0xf0) == 0xe0) /* 1110xxxx */
{
if (G_UNLIKELY (max_len >= 0 && max_len - (p - str) < 3))
goto error;
min = (1 << 11);
val = *(guchar *)p & 0x0f;
goto TWO_REMAINING;
}
else if ((*(guchar *)p & 0xf8) == 0xf0) /* 11110xxx */
{
if (G_UNLIKELY (max_len >= 0 && max_len - (p - str) < 4))
goto error;
min = (1 << 16);
val = *(guchar *)p & 0x07;
}
else
goto error;
p++;
CONTINUATION_CHAR;
TWO_REMAINING:
p++;
CONTINUATION_CHAR;
p++;
CONTINUATION_CHAR;
if (G_UNLIKELY (val < min))
goto error;
if (G_UNLIKELY (!UNICODE_VALID(val)))
goto error;
}
continue;
error:
return last;
}
}
return p;
}
/**
* g_utf8_validate:
* @str: a pointer to character data
* @max_len: max bytes to validate, or -1 to go until nul
* @max_len: max bytes to validate, or -1 to go until NUL
* @end: return location for end of valid data
*
* Validates UTF-8 encoded text. @str is the text to validate;
* if @str is nul-terminated, then @max_len can be -1, otherwise
* @max_len should be the number of bytes to validate.
* If @end is non-%NULL, then the end of the valid range
* will be stored there (i.e. the address of the first invalid byte
* if some bytes were invalid, or the end of the text being validated
* otherwise).
* will be stored there (i.e. the start of the first invalid
* character if some bytes were invalid, or the end of the text
* being validated otherwise).
*
* Note that g_utf8_validate() returns %FALSE if @max_len is
* positive and NUL is met before @max_len bytes have been read.
*
* Returns %TRUE if all of @str was valid. Many GLib and GTK+
* routines <emphasis>require</emphasis> valid UTF-8 as input;
@ -1533,66 +1685,29 @@ g_ucs4_to_utf16 (const gunichar *str,
* Return value: %TRUE if the text was valid UTF-8
**/
gboolean
g_utf8_validate (const gchar *str,
gssize max_len,
const gchar **end)
{
g_utf8_validate (const char *str,
gssize max_len,
const gchar **end)
{
const gchar *p;
g_return_val_if_fail (str != NULL, FALSE);
if (end)
*end = str;
p = str;
while ((max_len < 0 || (p - str) < max_len) && *p)
{
int i, mask = 0, len;
gunichar result;
unsigned char c = (unsigned char) *p;
UTF8_COMPUTE (c, mask, len);
if (len == -1)
break;
/* check that the expected number of bytes exists in str */
if (max_len >= 0 &&
((max_len - (p - str)) < len))
break;
UTF8_GET (result, p, i, mask, len);
if (UTF8_LENGTH (result) != len) /* Check for overlong UTF-8 */
break;
if (result == (gunichar)-1)
break;
if (!UNICODE_VALID (result))
break;
p += len;
}
if (max_len < 0)
p = fast_validate (str);
else
p = fast_validate_len (str, max_len);
if (end)
*end = p;
/* See that we covered the entire length if a length was
* passed in, or that we ended on a nul if not
*/
if (max_len >= 0 &&
p != (str + max_len))
return FALSE;
else if (max_len < 0 &&
*p != '\0')
if ((max_len >= 0 && p != str + max_len) ||
(max_len < 0 && *p != '\0'))
return FALSE;
else
return TRUE;
}
/**
* g_unichar_validate:
* @ch: a Unicode character