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glibc/libidn/nfkc.c
Paul Eggert 59ba27a63a Replace FSF snail mail address with URLs.
2012-02-09 23:18:22 +00:00

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/* nfkc.c Unicode normalization utilities.
* Copyright (C) 2002, 2003 Simon Josefsson
*
* This file is part of GNU Libidn.
*
* GNU Libidn is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* GNU Libidn is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with GNU Libidn; if not, see <http://www.gnu.org/licenses/>.
*/
#if HAVE_CONFIG_H
# include "config.h"
#endif
#include <stdlib.h>
#include <string.h>
#include "stringprep.h"
/* This file contains functions from GLIB, including gutf8.c and
* gunidecomp.c, all licensed under LGPL and copyright hold by:
*
* Copyright (C) 1999, 2000 Tom Tromey
* Copyright 2000 Red Hat, Inc.
*/
/* Hacks to make syncing with GLIB code easier. */
#define gboolean int
#define gchar char
#define guchar unsigned char
#define glong long
#define gint int
#define guint unsigned int
#define gushort unsigned short
#define gint16 int16_t
#define guint16 uint16_t
#define gunichar uint32_t
#define gsize size_t
#define gssize ssize_t
#define g_malloc malloc
#define g_free free
#define GError void
#define g_set_error(a,b,c,d) ((void) 0)
#define g_new(struct_type, n_structs) \
((struct_type *) g_malloc (((gsize) sizeof (struct_type)) * ((gsize) (n_structs))))
# if defined (__GNUC__) && !defined (__STRICT_ANSI__) && !defined (__cplusplus)
# define G_STMT_START (void)(
# define G_STMT_END )
# else
# if (defined (sun) || defined (__sun__))
# define G_STMT_START if (1)
# define G_STMT_END else (void)0
# else
# define G_STMT_START do
# define G_STMT_END while (0)
# endif
# endif
#define g_return_val_if_fail(expr,val) G_STMT_START{ (void)0; }G_STMT_END
#define G_N_ELEMENTS(arr) (sizeof (arr) / sizeof ((arr)[0]))
#define TRUE 1
#define FALSE 0
/* Code from GLIB gunicode.h starts here. */
typedef enum
{
G_NORMALIZE_DEFAULT,
G_NORMALIZE_NFD = G_NORMALIZE_DEFAULT,
G_NORMALIZE_DEFAULT_COMPOSE,
G_NORMALIZE_NFC = G_NORMALIZE_DEFAULT_COMPOSE,
G_NORMALIZE_ALL,
G_NORMALIZE_NFKD = G_NORMALIZE_ALL,
G_NORMALIZE_ALL_COMPOSE,
G_NORMALIZE_NFKC = G_NORMALIZE_ALL_COMPOSE
}
GNormalizeMode;
/* Code from GLIB gutf8.c starts here. */
#define UTF8_COMPUTE(Char, Mask, Len) \
if (Char < 128) \
{ \
Len = 1; \
Mask = 0x7f; \
} \
else if ((Char & 0xe0) == 0xc0) \
{ \
Len = 2; \
Mask = 0x1f; \
} \
else if ((Char & 0xf0) == 0xe0) \
{ \
Len = 3; \
Mask = 0x0f; \
} \
else if ((Char & 0xf8) == 0xf0) \
{ \
Len = 4; \
Mask = 0x07; \
} \
else if ((Char & 0xfc) == 0xf8) \
{ \
Len = 5; \
Mask = 0x03; \
} \
else if ((Char & 0xfe) == 0xfc) \
{ \
Len = 6; \
Mask = 0x01; \
} \
else \
Len = -1;
#define UTF8_LENGTH(Char) \
((Char) < 0x80 ? 1 : \
((Char) < 0x800 ? 2 : \
((Char) < 0x10000 ? 3 : \
((Char) < 0x200000 ? 4 : \
((Char) < 0x4000000 ? 5 : 6)))))
#define UTF8_GET(Result, Chars, Count, Mask, Len) \
(Result) = (Chars)[0] & (Mask); \
for ((Count) = 1; (Count) < (Len); ++(Count)) \
{ \
if (((Chars)[(Count)] & 0xc0) != 0x80) \
{ \
(Result) = -1; \
break; \
} \
(Result) <<= 6; \
(Result) |= ((Chars)[(Count)] & 0x3f); \
}
#define UNICODE_VALID(Char) \
((Char) < 0x110000 && \
(((Char) & 0xFFFFF800) != 0xD800) && \
((Char) < 0xFDD0 || (Char) > 0xFDEF) && \
((Char) & 0xFFFE) != 0xFFFE)
static const gchar utf8_skip_data[256] = {
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2, 2,
3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4, 5,
5, 5, 5, 6, 6, 1, 1
};
const gchar *const g_utf8_skip = utf8_skip_data;
#define g_utf8_next_char(p) (char *)((p) + g_utf8_skip[*(guchar *)(p)])
/*
* g_utf8_strlen:
* @p: pointer to the start of a UTF-8 encoded string.
* @max: the maximum number of bytes to examine. If @max
* is less than 0, then the string is assumed to be
* nul-terminated. If @max is 0, @p will not be examined and
* may be %NULL.
*
* Returns the length of the string in characters.
*
* Return value: the length of the string in characters
**/
static glong
g_utf8_strlen (const gchar * p, gssize max)
{
glong len = 0;
const gchar *start = p;
g_return_val_if_fail (p != NULL || max == 0, 0);
if (max < 0)
{
while (*p)
{
p = g_utf8_next_char (p);
++len;
}
}
else
{
if (max == 0 || !*p)
return 0;
p = g_utf8_next_char (p);
while (p - start < max && *p)
{
++len;
p = g_utf8_next_char (p);
}
/* only do the last len increment if we got a complete
* char (don't count partial chars)
*/
if (p - start == max)
++len;
}
return len;
}
/*
* g_utf8_get_char:
* @p: a pointer to Unicode character encoded as UTF-8
*
* Converts a sequence of bytes encoded as UTF-8 to a Unicode character.
* If @p does not point to a valid UTF-8 encoded character, results are
* undefined. If you are not sure that the bytes are complete
* valid Unicode characters, you should use g_utf8_get_char_validated()
* instead.
*
* Return value: the resulting character
**/
static gunichar
g_utf8_get_char (const gchar * p)
{
int i, mask = 0, len;
gunichar result;
unsigned char c = (unsigned char) *p;
UTF8_COMPUTE (c, mask, len);
if (len == -1)
return (gunichar) - 1;
UTF8_GET (result, p, i, mask, len);
return result;
}
/*
* g_unichar_to_utf8:
* @c: a ISO10646 character code
* @outbuf: output buffer, must have at least 6 bytes of space.
* If %NULL, the length will be computed and returned
* and nothing will be written to @outbuf.
*
* Converts a single character to UTF-8.
*
* Return value: number of bytes written
**/
static int
g_unichar_to_utf8 (gunichar c, gchar * outbuf)
{
guint len = 0;
int first;
int i;
if (c < 0x80)
{
first = 0;
len = 1;
}
else if (c < 0x800)
{
first = 0xc0;
len = 2;
}
else if (c < 0x10000)
{
first = 0xe0;
len = 3;
}
else if (c < 0x200000)
{
first = 0xf0;
len = 4;
}
else if (c < 0x4000000)
{
first = 0xf8;
len = 5;
}
else
{
first = 0xfc;
len = 6;
}
if (outbuf)
{
for (i = len - 1; i > 0; --i)
{
outbuf[i] = (c & 0x3f) | 0x80;
c >>= 6;
}
outbuf[0] = c | first;
}
return len;
}
/*
* g_utf8_to_ucs4_fast:
* @str: a UTF-8 encoded string
* @len: the maximum length of @str to use. If @len < 0, then
* the string is nul-terminated.
* @items_written: location to store the number of characters in the
* result, or %NULL.
*
* Convert a string from UTF-8 to a 32-bit fixed width
* representation as UCS-4, assuming valid UTF-8 input.
* This function is roughly twice as fast as g_utf8_to_ucs4()
* but does no error checking on the input.
*
* Return value: a pointer to a newly allocated UCS-4 string.
* This value must be freed with g_free().
**/
static gunichar *
g_utf8_to_ucs4_fast (const gchar * str, glong len, glong * items_written)
{
gint j, charlen;
gunichar *result;
gint n_chars, i;
const gchar *p;
g_return_val_if_fail (str != NULL, NULL);
p = str;
n_chars = 0;
if (len < 0)
{
while (*p)
{
p = g_utf8_next_char (p);
++n_chars;
}
}
else
{
while (p < str + len && *p)
{
p = g_utf8_next_char (p);
++n_chars;
}
}
result = g_new (gunichar, n_chars + 1);
if (!result)
return NULL;
p = str;
for (i = 0; i < n_chars; i++)
{
gunichar wc = ((unsigned char *) p)[0];
if (wc < 0x80)
{
result[i] = wc;
p++;
}
else
{
if (wc < 0xe0)
{
charlen = 2;
wc &= 0x1f;
}
else if (wc < 0xf0)
{
charlen = 3;
wc &= 0x0f;
}
else if (wc < 0xf8)
{
charlen = 4;
wc &= 0x07;
}
else if (wc < 0xfc)
{
charlen = 5;
wc &= 0x03;
}
else
{
charlen = 6;
wc &= 0x01;
}
for (j = 1; j < charlen; j++)
{
wc <<= 6;
wc |= ((unsigned char *) p)[j] & 0x3f;
}
result[i] = wc;
p += charlen;
}
}
result[i] = 0;
if (items_written)
*items_written = i;
return result;
}
/*
* g_ucs4_to_utf8:
* @str: a UCS-4 encoded string
* @len: the maximum length of @str to use. If @len < 0, then
* the string is terminated with a 0 character.
* @items_read: location to store number of characters read read, or %NULL.
* @items_written: location to store number of bytes written or %NULL.
* The value here stored does not include the trailing 0
* byte.
* @error: location to store the error occuring, or %NULL to ignore
* errors. Any of the errors in #GConvertError other than
* %G_CONVERT_ERROR_NO_CONVERSION may occur.
*
* Convert a string from a 32-bit fixed width representation as UCS-4.
* to UTF-8. The result will be terminated with a 0 byte.
*
* Return value: a pointer to a newly allocated UTF-8 string.
* This value must be freed with g_free(). If an
* error occurs, %NULL will be returned and
* @error set.
**/
static gchar *
g_ucs4_to_utf8 (const gunichar * str,
glong len,
glong * items_read, glong * items_written, GError ** error)
{
gint result_length;
gchar *result = NULL;
gchar *p;
gint i;
result_length = 0;
for (i = 0; len < 0 || i < len; i++)
{
if (!str[i])
break;
if (str[i] >= 0x80000000)
{
if (items_read)
*items_read = i;
g_set_error (error, G_CONVERT_ERROR,
G_CONVERT_ERROR_ILLEGAL_SEQUENCE,
_("Character out of range for UTF-8"));
goto err_out;
}
result_length += UTF8_LENGTH (str[i]);
}
result = g_malloc (result_length + 1);
if (!result)
return NULL;
p = result;
i = 0;
while (p < result + result_length)
p += g_unichar_to_utf8 (str[i++], p);
*p = '\0';
if (items_written)
*items_written = p - result;
err_out:
if (items_read)
*items_read = i;
return result;
}
/* Code from GLIB gunidecomp.c starts here. */
#include "gunidecomp.h"
#include "gunicomp.h"
#define CC_PART1(Page, Char) \
((combining_class_table_part1[Page] >= G_UNICODE_MAX_TABLE_INDEX) \
? (combining_class_table_part1[Page] - G_UNICODE_MAX_TABLE_INDEX) \
: (cclass_data[combining_class_table_part1[Page]][Char]))
#define CC_PART2(Page, Char) \
((combining_class_table_part2[Page] >= G_UNICODE_MAX_TABLE_INDEX) \
? (combining_class_table_part2[Page] - G_UNICODE_MAX_TABLE_INDEX) \
: (cclass_data[combining_class_table_part2[Page]][Char]))
#define COMBINING_CLASS(Char) \
(((Char) <= G_UNICODE_LAST_CHAR_PART1) \
? CC_PART1 ((Char) >> 8, (Char) & 0xff) \
: (((Char) >= 0xe0000 && (Char) <= G_UNICODE_LAST_CHAR) \
? CC_PART2 (((Char) - 0xe0000) >> 8, (Char) & 0xff) \
: 0))
/* constants for hangul syllable [de]composition */
#define SBase 0xAC00
#define LBase 0x1100
#define VBase 0x1161
#define TBase 0x11A7
#define LCount 19
#define VCount 21
#define TCount 28
#define NCount (VCount * TCount)
#define SCount (LCount * NCount)
/*
* g_unicode_canonical_ordering:
* @string: a UCS-4 encoded string.
* @len: the maximum length of @string to use.
*
* Computes the canonical ordering of a string in-place.
* This rearranges decomposed characters in the string
* according to their combining classes. See the Unicode
* manual for more information.
**/
static void
g_unicode_canonical_ordering (gunichar * string, gsize len)
{
gsize i;
int swap = 1;
while (swap)
{
int last;
swap = 0;
last = COMBINING_CLASS (string[0]);
for (i = 0; i < len - 1; ++i)
{
int next = COMBINING_CLASS (string[i + 1]);
if (next != 0 && last > next)
{
gsize j;
/* Percolate item leftward through string. */
for (j = i + 1; j > 0; --j)
{
gunichar t;
if (COMBINING_CLASS (string[j - 1]) <= next)
break;
t = string[j];
string[j] = string[j - 1];
string[j - 1] = t;
swap = 1;
}
/* We're re-entering the loop looking at the old
character again. */
next = last;
}
last = next;
}
}
}
/* http://www.unicode.org/unicode/reports/tr15/#Hangul
* r should be null or have sufficient space. Calling with r == NULL will
* only calculate the result_len; however, a buffer with space for three
* characters will always be big enough. */
static void
decompose_hangul (gunichar s, gunichar * r, gsize * result_len)
{
gint SIndex = s - SBase;
/* not a hangul syllable */
if (SIndex < 0 || SIndex >= SCount)
{
if (r)
r[0] = s;
*result_len = 1;
}
else
{
gunichar L = LBase + SIndex / NCount;
gunichar V = VBase + (SIndex % NCount) / TCount;
gunichar T = TBase + SIndex % TCount;
if (r)
{
r[0] = L;
r[1] = V;
}
if (T != TBase)
{
if (r)
r[2] = T;
*result_len = 3;
}
else
*result_len = 2;
}
}
/* returns a pointer to a null-terminated UTF-8 string */
static const gchar *
find_decomposition (gunichar ch, gboolean compat)
{
int start = 0;
int end = G_N_ELEMENTS (decomp_table);
if (ch >= decomp_table[start].ch && ch <= decomp_table[end - 1].ch)
{
while (TRUE)
{
int half = (start + end) / 2;
if (ch == decomp_table[half].ch)
{
int offset;
if (compat)
{
offset = decomp_table[half].compat_offset;
if (offset == G_UNICODE_NOT_PRESENT_OFFSET)
offset = decomp_table[half].canon_offset;
}
else
{
offset = decomp_table[half].canon_offset;
if (offset == G_UNICODE_NOT_PRESENT_OFFSET)
return NULL;
}
return &(decomp_expansion_string[offset]);
}
else if (half == start)
break;
else if (ch > decomp_table[half].ch)
start = half;
else
end = half;
}
}
return NULL;
}
/* L,V => LV and LV,T => LVT */
static gboolean
combine_hangul (gunichar a, gunichar b, gunichar * result)
{
gint LIndex = a - LBase;
gint SIndex = a - SBase;
gint VIndex = b - VBase;
gint TIndex = b - TBase;
if (0 <= LIndex && LIndex < LCount && 0 <= VIndex && VIndex < VCount)
{
*result = SBase + (LIndex * VCount + VIndex) * TCount;
return TRUE;
}
else if (0 <= SIndex && SIndex < SCount && (SIndex % TCount) == 0
&& 0 <= TIndex && TIndex <= TCount)
{
*result = a + TIndex;
return TRUE;
}
return FALSE;
}
#define CI(Page, Char) \
((compose_table[Page] >= G_UNICODE_MAX_TABLE_INDEX) \
? (compose_table[Page] - G_UNICODE_MAX_TABLE_INDEX) \
: (compose_data[compose_table[Page]][Char]))
#define COMPOSE_INDEX(Char) \
((((Char) >> 8) > (COMPOSE_TABLE_LAST)) ? 0 : CI((Char) >> 8, (Char) & 0xff))
static gboolean
combine (gunichar a, gunichar b, gunichar * result)
{
gushort index_a, index_b;
if (combine_hangul (a, b, result))
return TRUE;
index_a = COMPOSE_INDEX (a);
if (index_a >= COMPOSE_FIRST_SINGLE_START && index_a < COMPOSE_SECOND_START)
{
if (b == compose_first_single[index_a - COMPOSE_FIRST_SINGLE_START][0])
{
*result =
compose_first_single[index_a - COMPOSE_FIRST_SINGLE_START][1];
return TRUE;
}
else
return FALSE;
}
index_b = COMPOSE_INDEX (b);
if (index_b >= COMPOSE_SECOND_SINGLE_START)
{
if (a ==
compose_second_single[index_b - COMPOSE_SECOND_SINGLE_START][0])
{
*result =
compose_second_single[index_b - COMPOSE_SECOND_SINGLE_START][1];
return TRUE;
}
else
return FALSE;
}
if (index_a >= COMPOSE_FIRST_START && index_a < COMPOSE_FIRST_SINGLE_START
&& index_b >= COMPOSE_SECOND_START
&& index_b < COMPOSE_SECOND_SINGLE_START)
{
gunichar res =
compose_array[index_a - COMPOSE_FIRST_START][index_b -
COMPOSE_SECOND_START];
if (res)
{
*result = res;
return TRUE;
}
}
return FALSE;
}
static gunichar *
_g_utf8_normalize_wc (const gchar * str, gssize max_len, GNormalizeMode mode)
{
gsize n_wc;
gunichar *wc_buffer;
const char *p;
gsize last_start;
gboolean do_compat = (mode == G_NORMALIZE_NFKC || mode == G_NORMALIZE_NFKD);
gboolean do_compose = (mode == G_NORMALIZE_NFC || mode == G_NORMALIZE_NFKC);
n_wc = 0;
p = str;
while ((max_len < 0 || p < str + max_len) && *p)
{
const gchar *decomp;
gunichar wc = g_utf8_get_char (p);
if (wc >= 0xac00 && wc <= 0xd7af)
{
gsize result_len;
decompose_hangul (wc, NULL, &result_len);
n_wc += result_len;
}
else
{
decomp = find_decomposition (wc, do_compat);
if (decomp)
n_wc += g_utf8_strlen (decomp, -1);
else
n_wc++;
}
p = g_utf8_next_char (p);
}
wc_buffer = g_new (gunichar, n_wc + 1);
if (!wc_buffer)
return NULL;
last_start = 0;
n_wc = 0;
p = str;
while ((max_len < 0 || p < str + max_len) && *p)
{
gunichar wc = g_utf8_get_char (p);
const gchar *decomp;
int cc;
gsize old_n_wc = n_wc;
if (wc >= 0xac00 && wc <= 0xd7af)
{
gsize result_len;
decompose_hangul (wc, wc_buffer + n_wc, &result_len);
n_wc += result_len;
}
else
{
decomp = find_decomposition (wc, do_compat);
if (decomp)
{
const char *pd;
for (pd = decomp; *pd != '\0'; pd = g_utf8_next_char (pd))
wc_buffer[n_wc++] = g_utf8_get_char (pd);
}
else
wc_buffer[n_wc++] = wc;
}
if (n_wc > 0)
{
cc = COMBINING_CLASS (wc_buffer[old_n_wc]);
if (cc == 0)
{
g_unicode_canonical_ordering (wc_buffer + last_start,
n_wc - last_start);
last_start = old_n_wc;
}
}
p = g_utf8_next_char (p);
}
if (n_wc > 0)
{
g_unicode_canonical_ordering (wc_buffer + last_start,
n_wc - last_start);
last_start = n_wc;
}
wc_buffer[n_wc] = 0;
/* All decomposed and reordered */
if (do_compose && n_wc > 0)
{
gsize i, j;
int last_cc = 0;
last_start = 0;
for (i = 0; i < n_wc; i++)
{
int cc = COMBINING_CLASS (wc_buffer[i]);
if (i > 0 &&
(last_cc == 0 || last_cc != cc) &&
combine (wc_buffer[last_start], wc_buffer[i],
&wc_buffer[last_start]))
{
for (j = i + 1; j < n_wc; j++)
wc_buffer[j - 1] = wc_buffer[j];
n_wc--;
i--;
if (i == last_start)
last_cc = 0;
else
last_cc = COMBINING_CLASS (wc_buffer[i - 1]);
continue;
}
if (cc == 0)
last_start = i;
last_cc = cc;
}
}
wc_buffer[n_wc] = 0;
return wc_buffer;
}
/*
* g_utf8_normalize:
* @str: a UTF-8 encoded string.
* @len: length of @str, in bytes, or -1 if @str is nul-terminated.
* @mode: the type of normalization to perform.
*
* Converts a string into canonical form, standardizing
* such issues as whether a character with an accent
* is represented as a base character and combining
* accent or as a single precomposed character. You
* should generally call g_utf8_normalize() before
* comparing two Unicode strings.
*
* The normalization mode %G_NORMALIZE_DEFAULT only
* standardizes differences that do not affect the
* text content, such as the above-mentioned accent
* representation. %G_NORMALIZE_ALL also standardizes
* the "compatibility" characters in Unicode, such
* as SUPERSCRIPT THREE to the standard forms
* (in this case DIGIT THREE). Formatting information
* may be lost but for most text operations such
* characters should be considered the same.
* For example, g_utf8_collate() normalizes
* with %G_NORMALIZE_ALL as its first step.
*
* %G_NORMALIZE_DEFAULT_COMPOSE and %G_NORMALIZE_ALL_COMPOSE
* are like %G_NORMALIZE_DEFAULT and %G_NORMALIZE_ALL,
* but returned a result with composed forms rather
* than a maximally decomposed form. This is often
* useful if you intend to convert the string to
* a legacy encoding or pass it to a system with
* less capable Unicode handling.
*
* Return value: a newly allocated string, that is the
* normalized form of @str.
**/
static gchar *
g_utf8_normalize (const gchar * str, gssize len, GNormalizeMode mode)
{
gunichar *result_wc = _g_utf8_normalize_wc (str, len, mode);
gchar *result;
result = g_ucs4_to_utf8 (result_wc, -1, NULL, NULL, NULL);
g_free (result_wc);
return result;
}
/* Public Libidn API starts here. */
/**
* stringprep_utf8_to_unichar:
* @p: a pointer to Unicode character encoded as UTF-8
*
* Converts a sequence of bytes encoded as UTF-8 to a Unicode character.
* If @p does not point to a valid UTF-8 encoded character, results are
* undefined.
*
* Return value: the resulting character.
**/
uint32_t
stringprep_utf8_to_unichar (const char *p)
{
return g_utf8_get_char (p);
}
/**
* stringprep_unichar_to_utf8:
* @c: a ISO10646 character code
* @outbuf: output buffer, must have at least 6 bytes of space.
* If %NULL, the length will be computed and returned
* and nothing will be written to @outbuf.
*
* Converts a single character to UTF-8.
*
* Return value: number of bytes written.
**/
int
stringprep_unichar_to_utf8 (uint32_t c, char *outbuf)
{
return g_unichar_to_utf8 (c, outbuf);
}
/**
* stringprep_utf8_to_ucs4:
* @str: a UTF-8 encoded string
* @len: the maximum length of @str to use. If @len < 0, then
* the string is nul-terminated.
* @items_written: location to store the number of characters in the
* result, or %NULL.
*
* Convert a string from UTF-8 to a 32-bit fixed width
* representation as UCS-4, assuming valid UTF-8 input.
* This function does no error checking on the input.
*
* Return value: a pointer to a newly allocated UCS-4 string.
* This value must be freed with free().
**/
uint32_t *
stringprep_utf8_to_ucs4 (const char *str, ssize_t len, size_t * items_written)
{
return g_utf8_to_ucs4_fast (str, (glong) len, (glong *) items_written);
}
/**
* stringprep_ucs4_to_utf8:
* @str: a UCS-4 encoded string
* @len: the maximum length of @str to use. If @len < 0, then
* the string is terminated with a 0 character.
* @items_read: location to store number of characters read read, or %NULL.
* @items_written: location to store number of bytes written or %NULL.
* The value here stored does not include the trailing 0
* byte.
*
* Convert a string from a 32-bit fixed width representation as UCS-4.
* to UTF-8. The result will be terminated with a 0 byte.
*
* Return value: a pointer to a newly allocated UTF-8 string.
* This value must be freed with free(). If an
* error occurs, %NULL will be returned and
* @error set.
**/
char *
stringprep_ucs4_to_utf8 (const uint32_t * str, ssize_t len,
size_t * items_read, size_t * items_written)
{
return g_ucs4_to_utf8 (str, len, (glong *) items_read,
(glong *) items_written, NULL);
}
/**
* stringprep_utf8_nfkc_normalize:
* @str: a UTF-8 encoded string.
* @len: length of @str, in bytes, or -1 if @str is nul-terminated.
*
* Converts a string into canonical form, standardizing
* such issues as whether a character with an accent
* is represented as a base character and combining
* accent or as a single precomposed character.
*
* The normalization mode is NFKC (ALL COMPOSE). It standardizes
* differences that do not affect the text content, such as the
* above-mentioned accent representation. It standardizes the
* "compatibility" characters in Unicode, such as SUPERSCRIPT THREE to
* the standard forms (in this case DIGIT THREE). Formatting
* information may be lost but for most text operations such
* characters should be considered the same. It returns a result with
* composed forms rather than a maximally decomposed form.
*
* Return value: a newly allocated string, that is the
* NFKC normalized form of @str.
**/
char *
stringprep_utf8_nfkc_normalize (const char *str, ssize_t len)
{
return g_utf8_normalize (str, len, G_NORMALIZE_NFKC);
}
/**
* stringprep_ucs4_nfkc_normalize:
* @str: a Unicode string.
* @len: length of @str array, or -1 if @str is nul-terminated.
*
* Converts UCS4 string into UTF-8 and runs
* stringprep_utf8_nfkc_normalize().
*
* Return value: a newly allocated Unicode string, that is the NFKC
* normalized form of @str.
**/
uint32_t *
stringprep_ucs4_nfkc_normalize (uint32_t * str, ssize_t len)
{
char *p;
uint32_t *result_wc;
p = stringprep_ucs4_to_utf8 (str, len, 0, 0);
result_wc = _g_utf8_normalize_wc (p, -1, G_NORMALIZE_NFKC);
free (p);
return result_wc;
}
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