| /* gutf8.c - Operations on UTF-8 strings. |
| * |
| * Copyright (C) 1999 Tom Tromey |
| * Copyright (C) 2000 Red Hat, Inc. |
| * |
| * This library 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 of the License, or (at your option) any later version. |
| * |
| * This library 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 this library; if not, write to the |
| * Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
| * Boston, MA 02111-1307, USA. |
| */ |
| |
| #include <config.h> |
| |
| #include <stdlib.h> |
| #ifdef HAVE_CODESET |
| #include <langinfo.h> |
| #endif |
| #include <string.h> |
| |
| #include "glib.h" |
| |
| #ifdef G_PLATFORM_WIN32 |
| #include <stdio.h> |
| #define STRICT |
| #include <windows.h> |
| #undef STRICT |
| #endif |
| |
| #include "libcharset/libcharset.h" |
| |
| #include "glibintl.h" |
| |
| #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) < 0xD800 || (Char) >= 0xE000) && \ |
| (Char) != 0xFFFE && (Char) != 0xFFFF) |
| |
| |
| 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; |
| |
| /** |
| * g_utf8_find_prev_char: |
| * @str: pointer to the beginning of a UTF-8 encoded string |
| * @p: pointer to some position within @str |
| * |
| * Given a position @p with a UTF-8 encoded string @str, find the start |
| * of the previous UTF-8 character starting before @p. Returns %NULL if no |
| * UTF-8 characters are present in @p before @str. |
| * |
| * @p does not have to be at the beginning of a UTF-8 character. No check |
| * is made to see if the character found is actually valid other than |
| * it starts with an appropriate byte. |
| * |
| * Return value: a pointer to the found character or %NULL. |
| **/ |
| gchar * |
| g_utf8_find_prev_char (const char *str, |
| const char *p) |
| { |
| for (--p; p >= str; --p) |
| { |
| if ((*p & 0xc0) != 0x80) |
| return (gchar *)p; |
| } |
| return NULL; |
| } |
| |
| /** |
| * g_utf8_find_next_char: |
| * @p: a pointer to a position within a UTF-8 encoded string |
| * @end: a pointer to the end of the string, or %NULL to indicate |
| * that the string is nul-terminated, in which case |
| * the returned value will be |
| * |
| * Finds the start of the next UTF-8 character in the string after @p. |
| * |
| * @p does not have to be at the beginning of a UTF-8 character. No check |
| * is made to see if the character found is actually valid other than |
| * it starts with an appropriate byte. |
| * |
| * Return value: a pointer to the found character or %NULL |
| **/ |
| gchar * |
| g_utf8_find_next_char (const gchar *p, |
| const gchar *end) |
| { |
| if (*p) |
| { |
| if (end) |
| for (++p; p < end && (*p & 0xc0) == 0x80; ++p) |
| ; |
| else |
| for (++p; (*p & 0xc0) == 0x80; ++p) |
| ; |
| } |
| return (p == end) ? NULL : (gchar *)p; |
| } |
| |
| /** |
| * g_utf8_prev_char: |
| * @p: a pointer to a position within a UTF-8 encoded string |
| * |
| * Finds the previous UTF-8 character in the string before @p. |
| * |
| * @p does not have to be at the beginning of a UTF-8 character. No check |
| * is made to see if the character found is actually valid other than |
| * it starts with an appropriate byte. If @p might be the first |
| * character of the string, you must use g_utf8_find_prev_char() instead. |
| * |
| * Return value: a pointer to the found character. |
| **/ |
| gchar * |
| g_utf8_prev_char (const gchar *p) |
| { |
| while (TRUE) |
| { |
| p--; |
| if ((*p & 0xc0) != 0x80) |
| return (gchar *)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. |
| * |
| * Returns the length of the string in characters. |
| * |
| * Return value: the length of the string in characters |
| **/ |
| glong |
| g_utf8_strlen (const gchar *p, |
| gssize max) |
| { |
| glong len = 0; |
| const gchar *start = p; |
| |
| 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 |
| **/ |
| 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_utf8_offset_to_pointer: |
| * @str: a UTF-8 encoded string |
| * @offset: a character offset within @str |
| * |
| * Converts from an integer character offset to a pointer to a position |
| * within the string. |
| * |
| * Return value: the resulting pointer |
| **/ |
| gchar * |
| g_utf8_offset_to_pointer (const gchar *str, |
| glong offset) |
| { |
| const gchar *s = str; |
| while (offset--) |
| s = g_utf8_next_char (s); |
| |
| return (gchar *)s; |
| } |
| |
| /** |
| * g_utf8_pointer_to_offset: |
| * @str: a UTF-8 encoded string |
| * @pos: a pointer to a position within @str |
| * |
| * Converts from a pointer to position within a string to a integer |
| * character offset. |
| * |
| * Return value: the resulting character offset |
| **/ |
| glong |
| g_utf8_pointer_to_offset (const gchar *str, |
| const gchar *pos) |
| { |
| const gchar *s = str; |
| glong offset = 0; |
| |
| while (s < pos) |
| { |
| s = g_utf8_next_char (s); |
| offset++; |
| } |
| |
| return offset; |
| } |
| |
| |
| /** |
| * g_utf8_strncpy: |
| * @dest: buffer to fill with characters from @src |
| * @src: UTF-8 encoded string |
| * @n: character count |
| * |
| * Like the standard C <function>strncpy()</function> function, but |
| * copies a given number of characters instead of a given number of |
| * bytes. The @src string must be valid UTF-8 encoded text. |
| * (Use g_utf8_validate() on all text before trying to use UTF-8 |
| * utility functions with it.) |
| * |
| * Return value: @dest |
| **/ |
| gchar * |
| g_utf8_strncpy (gchar *dest, |
| const gchar *src, |
| gsize n) |
| { |
| const gchar *s = src; |
| while (n && *s) |
| { |
| s = g_utf8_next_char(s); |
| n--; |
| } |
| strncpy(dest, src, s - src); |
| dest[s - src] = 0; |
| return dest; |
| } |
| |
| G_LOCK_DEFINE_STATIC (aliases); |
| |
| static GHashTable * |
| get_alias_hash (void) |
| { |
| static GHashTable *alias_hash = NULL; |
| const char *aliases; |
| |
| G_LOCK (aliases); |
| |
| if (!alias_hash) |
| { |
| alias_hash = g_hash_table_new (g_str_hash, g_str_equal); |
| |
| aliases = _g_locale_get_charset_aliases (); |
| while (*aliases != '\0') |
| { |
| const char *canonical; |
| const char *alias; |
| const char **alias_array; |
| int count = 0; |
| |
| alias = aliases; |
| aliases += strlen (aliases) + 1; |
| canonical = aliases; |
| aliases += strlen (aliases) + 1; |
| |
| alias_array = g_hash_table_lookup (alias_hash, canonical); |
| if (alias_array) |
| { |
| while (alias_array[count]) |
| count++; |
| } |
| |
| alias_array = g_renew (const char *, alias_array, count + 2); |
| alias_array[count] = alias; |
| alias_array[count + 1] = NULL; |
| |
| g_hash_table_insert (alias_hash, (char *)canonical, alias_array); |
| } |
| } |
| |
| G_UNLOCK (aliases); |
| |
| return alias_hash; |
| } |
| |
| /* As an abuse of the alias table, the following routines gets |
| * the charsets that are aliases for the canonical name. |
| */ |
| const char ** |
| _g_charset_get_aliases (const char *canonical_name) |
| { |
| GHashTable *alias_hash = get_alias_hash (); |
| |
| return g_hash_table_lookup (alias_hash, canonical_name); |
| } |
| |
| static gboolean |
| g_utf8_get_charset_internal (const char *raw_data, |
| const char **a) |
| { |
| const char *charset = getenv("CHARSET"); |
| |
| if (charset && *charset) |
| { |
| *a = charset; |
| |
| if (charset && strstr (charset, "UTF-8")) |
| return TRUE; |
| else |
| return FALSE; |
| } |
| |
| /* The libcharset code tries to be thread-safe without |
| * a lock, but has a memory leak and a missing memory |
| * barrier, so we lock for it |
| */ |
| G_LOCK (aliases); |
| charset = _g_locale_charset_unalias (raw_data); |
| G_UNLOCK (aliases); |
| |
| if (charset && *charset) |
| { |
| *a = charset; |
| |
| if (charset && strstr (charset, "UTF-8")) |
| return TRUE; |
| else |
| return FALSE; |
| } |
| |
| /* Assume this for compatibility at present. */ |
| *a = "US-ASCII"; |
| |
| return FALSE; |
| } |
| |
| typedef struct _GCharsetCache GCharsetCache; |
| |
| struct _GCharsetCache { |
| gboolean is_utf8; |
| gchar *raw; |
| gchar *charset; |
| }; |
| |
| static void |
| charset_cache_free (gpointer data) |
| { |
| GCharsetCache *cache = data; |
| g_free (cache->raw); |
| g_free (cache->charset); |
| g_free (cache); |
| } |
| |
| /** |
| * g_get_charset: |
| * @charset: return location for character set name |
| * |
| * Obtains the character set for the current locale; you might use |
| * this character set as an argument to g_convert(), to convert from |
| * the current locale's encoding to some other encoding. (Frequently |
| * g_locale_to_utf8() and g_locale_from_utf8() are nice shortcuts, |
| * though.) |
| * |
| * The return value is %TRUE if the locale's encoding is UTF-8, in that |
| * case you can perhaps avoid calling g_convert(). |
| * |
| * The string returned in @charset is not allocated, and should not be |
| * freed. |
| * |
| * Return value: %TRUE if the returned charset is UTF-8 |
| **/ |
| gboolean |
| g_get_charset (G_CONST_RETURN char **charset) |
| { |
| static GStaticPrivate cache_private = G_STATIC_PRIVATE_INIT; |
| GCharsetCache *cache = g_static_private_get (&cache_private); |
| const gchar *raw; |
| |
| if (!cache) |
| { |
| cache = g_new0 (GCharsetCache, 1); |
| g_static_private_set (&cache_private, cache, charset_cache_free); |
| } |
| |
| raw = _g_locale_charset_raw (); |
| |
| if (!(cache->raw && strcmp (cache->raw, raw) == 0)) |
| { |
| const gchar *new_charset; |
| |
| g_free (cache->raw); |
| g_free (cache->charset); |
| cache->raw = g_strdup (raw); |
| cache->is_utf8 = g_utf8_get_charset_internal (raw, &new_charset); |
| cache->charset = g_strdup (new_charset); |
| } |
| |
| if (charset) |
| *charset = cache->charset; |
| |
| return cache->is_utf8; |
| } |
| |
| /* unicode_strchr */ |
| |
| /** |
| * 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 |
| **/ |
| 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_strchr: |
| * @p: a nul-terminated UTF-8 encoded string |
| * @len: the maximum length of @p |
| * @c: a ISO10646 character |
| * |
| * Finds the leftmost occurrence of the given ISO10646 character |
| * in a UTF-8 encoded string, while limiting the search to @len bytes. |
| * If @len is -1, allow unbounded search. |
| * |
| * Return value: %NULL if the string does not contain the character, |
| * otherwise, a pointer to the start of the leftmost occurrence of |
| * the character in the string. |
| **/ |
| gchar * |
| g_utf8_strchr (const char *p, |
| gssize len, |
| gunichar c) |
| { |
| gchar ch[10]; |
| |
| gint charlen = g_unichar_to_utf8 (c, ch); |
| ch[charlen] = '\0'; |
| |
| return g_strstr_len (p, len, ch); |
| } |
| |
| |
| /** |
| * g_utf8_strrchr: |
| * @p: a nul-terminated UTF-8 encoded string |
| * @len: the maximum length of @p |
| * @c: a ISO10646 character |
| * |
| * Find the rightmost occurrence of the given ISO10646 character |
| * in a UTF-8 encoded string, while limiting the search to @len bytes. |
| * If @len is -1, allow unbounded search. |
| * |
| * Return value: %NULL if the string does not contain the character, |
| * otherwise, a pointer to the start of the rightmost occurrence of the |
| * character in the string. |
| **/ |
| gchar * |
| g_utf8_strrchr (const char *p, |
| gssize len, |
| gunichar c) |
| { |
| gchar ch[10]; |
| |
| gint charlen = g_unichar_to_utf8 (c, ch); |
| ch[charlen] = '\0'; |
| |
| return g_strrstr_len (p, len, ch); |
| } |
| |
| |
| /* Like g_utf8_get_char, but take a maximum length |
| * and return (gunichar)-2 on incomplete trailing character |
| */ |
| static inline gunichar |
| g_utf8_get_char_extended (const gchar *p, |
| gssize max_len) |
| { |
| guint i, len; |
| gunichar wc = (guchar) *p; |
| |
| if (wc < 0x80) |
| { |
| return wc; |
| } |
| else if (wc < 0xc0) |
| { |
| return (gunichar)-1; |
| } |
| else if (wc < 0xe0) |
| { |
| len = 2; |
| wc &= 0x1f; |
| } |
| else if (wc < 0xf0) |
| { |
| len = 3; |
| wc &= 0x0f; |
| } |
| else if (wc < 0xf8) |
| { |
| len = 4; |
| wc &= 0x07; |
| } |
| else if (wc < 0xfc) |
| { |
| len = 5; |
| wc &= 0x03; |
| } |
| else if (wc < 0xfe) |
| { |
| len = 6; |
| wc &= 0x01; |
| } |
| else |
| { |
| return (gunichar)-1; |
| } |
| |
| if (max_len >= 0 && len > max_len) |
| { |
| for (i = 1; i < max_len; i++) |
| { |
| if ((((guchar *)p)[i] & 0xc0) != 0x80) |
| return (gunichar)-1; |
| } |
| return (gunichar)-2; |
| } |
| |
| for (i = 1; i < len; ++i) |
| { |
| gunichar ch = ((guchar *)p)[i]; |
| |
| if ((ch & 0xc0) != 0x80) |
| { |
| if (ch) |
| return (gunichar)-1; |
| else |
| return (gunichar)-2; |
| } |
| |
| wc <<= 6; |
| wc |= (ch & 0x3f); |
| } |
| |
| if (UTF8_LENGTH(wc) != len) |
| return (gunichar)-1; |
| |
| return wc; |
| } |
| |
| /** |
| * g_utf8_get_char_validated: |
| * @p: a pointer to Unicode character encoded as UTF-8 |
| * @max_len: the maximum number of bytes to read, or -1, for no maximum. |
| * |
| * Convert a sequence of bytes encoded as UTF-8 to a Unicode character. |
| * This function checks for incomplete characters, for invalid characters |
| * such as characters that are out of the range of Unicode, and for |
| * overlong encodings of valid characters. |
| * |
| * Return value: the resulting character. If @p points to a partial |
| * sequence at the end of a string that could begin a valid character, |
| * returns (gunichar)-2; otherwise, if @p does not point to a valid |
| * UTF-8 encoded Unicode character, returns (gunichar)-1. |
| **/ |
| gunichar |
| g_utf8_get_char_validated (const gchar *p, |
| gssize max_len) |
| { |
| gunichar result = g_utf8_get_char_extended (p, max_len); |
| |
| if (result & 0x80000000) |
| return result; |
| else if (!UNICODE_VALID (result)) |
| return (gunichar)-1; |
| else |
| return result; |
| } |
| |
| /** |
| * 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(). |
| **/ |
| 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); |
| |
| 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_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_read: location to store number of bytes read, or %NULL. |
| * If %NULL, then %G_CONVERT_ERROR_PARTIAL_INPUT will be |
| * returned in case @str contains a trailing partial |
| * character. If an error occurs then the index of the |
| * invalid input is stored here. |
| * @items_written: location to store number of characters written or %NULL. |
| * The value here stored does not include the trailing 0 |
| * character. |
| * @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 UTF-8 to a 32-bit fixed width |
| * representation as UCS-4. A trailing 0 will be added to the |
| * string after the converted text. |
| * |
| * Return value: a pointer to a newly allocated UCS-4 string. |
| * This value must be freed with g_free(). If an |
| * error occurs, %NULL will be returned and |
| * @error set. |
| **/ |
| gunichar * |
| g_utf8_to_ucs4 (const gchar *str, |
| glong len, |
| glong *items_read, |
| glong *items_written, |
| GError **error) |
| { |
| gunichar *result = NULL; |
| gint n_chars, i; |
| const gchar *in; |
| |
| in = str; |
| n_chars = 0; |
| while ((len < 0 || str + len - in > 0) && *in) |
| { |
| gunichar wc = g_utf8_get_char_extended (in, str + len - in); |
| if (wc & 0x80000000) |
| { |
| if (wc == (gunichar)-2) |
| { |
| if (items_read) |
| break; |
| else |
| g_set_error (error, G_CONVERT_ERROR, G_CONVERT_ERROR_PARTIAL_INPUT, |
| _("Partial character sequence at end of input")); |
| } |
| else |
| g_set_error (error, G_CONVERT_ERROR, G_CONVERT_ERROR_ILLEGAL_SEQUENCE, |
| _("Invalid byte sequence in conversion input")); |
| |
| goto err_out; |
| } |
| |
| n_chars++; |
| |
| in = g_utf8_next_char (in); |
| } |
| |
| result = g_new (gunichar, n_chars + 1); |
| |
| in = str; |
| for (i=0; i < n_chars; i++) |
| { |
| result[i] = g_utf8_get_char (in); |
| in = g_utf8_next_char (in); |
| } |
| result[i] = 0; |
| |
| if (items_written) |
| *items_written = n_chars; |
| |
| err_out: |
| if (items_read) |
| *items_read = in - str; |
| |
| 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. |
| **/ |
| 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); |
| 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; |
| } |
| |
| #define SURROGATE_VALUE(h,l) (((h) - 0xd800) * 0x400 + (l) - 0xdc00 + 0x10000) |
| |
| /** |
| * g_utf16_to_utf8: |
| * @str: a UTF-16 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 words read, or %NULL. |
| * If %NULL, then %G_CONVERT_ERROR_PARTIAL_INPUT will be |
| * returned in case @str contains a trailing partial |
| * character. If an error occurs then the index of the |
| * invalid input is stored here. |
| * @items_written: location to store number of bytes written, or %NULL. |
| * The value stored here 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 UTF-16 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. |
| **/ |
| gchar * |
| g_utf16_to_utf8 (const gunichar2 *str, |
| glong len, |
| glong *items_read, |
| glong *items_written, |
| GError **error) |
| { |
| /* This function and g_utf16_to_ucs4 are almost exactly identical - The lines that differ |
| * are marked. |
| */ |
| const gunichar2 *in; |
| gchar *out; |
| gchar *result = NULL; |
| gint n_bytes; |
| gunichar high_surrogate; |
| |
| g_return_val_if_fail (str != 0, NULL); |
| |
| n_bytes = 0; |
| in = str; |
| high_surrogate = 0; |
| while ((len < 0 || in - str < len) && *in) |
| { |
| gunichar2 c = *in; |
| gunichar wc; |
| |
| if (c >= 0xdc00 && c < 0xe000) /* low surrogate */ |
| { |
| if (high_surrogate) |
| { |
| wc = SURROGATE_VALUE (high_surrogate, c); |
| high_surrogate = 0; |
| } |
| else |
| { |
| g_set_error (error, G_CONVERT_ERROR, G_CONVERT_ERROR_ILLEGAL_SEQUENCE, |
| _("Invalid sequence in conversion input")); |
| goto err_out; |
| } |
| } |
| else |
| { |
| if (high_surrogate) |
| { |
| g_set_error (error, G_CONVERT_ERROR, G_CONVERT_ERROR_ILLEGAL_SEQUENCE, |
| _("Invalid sequence in conversion input")); |
| goto err_out; |
| } |
| |
| if (c >= 0xd800 && c < 0xdc00) /* high surrogate */ |
| { |
| high_surrogate = c; |
| goto next1; |
| } |
| else |
| wc = c; |
| } |
| |
| /********** DIFFERENT for UTF8/UCS4 **********/ |
| n_bytes += UTF8_LENGTH (wc); |
| |
| next1: |
| in++; |
| } |
| |
| if (high_surrogate && !items_read) |
| { |
| g_set_error (error, G_CONVERT_ERROR, G_CONVERT_ERROR_PARTIAL_INPUT, |
| _("Partial character sequence at end of input")); |
| goto err_out; |
| } |
| |
| /* At this point, everything is valid, and we just need to convert |
| */ |
| /********** DIFFERENT for UTF8/UCS4 **********/ |
| result = g_malloc (n_bytes + 1); |
| |
| high_surrogate = 0; |
| out = result; |
| in = str; |
| while (out < result + n_bytes) |
| { |
| gunichar2 c = *in; |
| gunichar wc; |
| |
| if (c >= 0xdc00 && c < 0xe000) /* low surrogate */ |
| { |
| wc = SURROGATE_VALUE (high_surrogate, c); |
| high_surrogate = 0; |
| } |
| else if (c >= 0xd800 && c < 0xdc00) /* high surrogate */ |
| { |
| high_surrogate = c; |
| goto next2; |
| } |
| else |
| wc = c; |
| |
| /********** DIFFERENT for UTF8/UCS4 **********/ |
| out += g_unichar_to_utf8 (wc, out); |
| |
| next2: |
| in++; |
| } |
| |
| /********** DIFFERENT for UTF8/UCS4 **********/ |
| *out = '\0'; |
| |
| if (items_written) |
| /********** DIFFERENT for UTF8/UCS4 **********/ |
| *items_written = out - result; |
| |
| err_out: |
| if (items_read) |
| *items_read = in - str; |
| |
| return result; |
| } |
| |
| /** |
| * g_utf16_to_ucs4: |
| * @str: a UTF-16 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 words read, or %NULL. |
| * If %NULL, then %G_CONVERT_ERROR_PARTIAL_INPUT will be |
| * returned in case @str contains a trailing partial |
| * character. If an error occurs then the index of the |
| * invalid input is stored here. |
| * @items_written: location to store number of characters written, or %NULL. |
| * The value stored here does not include the trailing |
| * 0 character. |
| * @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 UTF-16 to UCS-4. The result will be |
| * terminated with a 0 character. |
| * |
| * Return value: a pointer to a newly allocated UCS-4 string. |
| * This value must be freed with g_free(). If an |
| * error occurs, %NULL will be returned and |
| * @error set. |
| **/ |
| gunichar * |
| g_utf16_to_ucs4 (const gunichar2 *str, |
| glong len, |
| glong *items_read, |
| glong *items_written, |
| GError **error) |
| { |
| const gunichar2 *in; |
| gchar *out; |
| gchar *result = NULL; |
| gint n_bytes; |
| gunichar high_surrogate; |
| |
| g_return_val_if_fail (str != 0, NULL); |
| |
| n_bytes = 0; |
| in = str; |
| high_surrogate = 0; |
| while ((len < 0 || in - str < len) && *in) |
| { |
| gunichar2 c = *in; |
| gunichar wc; |
| |
| if (c >= 0xdc00 && c < 0xe000) /* low surrogate */ |
| { |
| if (high_surrogate) |
| { |
| wc = SURROGATE_VALUE (high_surrogate, c); |
| high_surrogate = 0; |
| } |
| else |
| { |
| g_set_error (error, G_CONVERT_ERROR, G_CONVERT_ERROR_ILLEGAL_SEQUENCE, |
| _("Invalid sequence in conversion input")); |
| goto err_out; |
| } |
| } |
| else |
| { |
| if (high_surrogate) |
| { |
| g_set_error (error, G_CONVERT_ERROR, G_CONVERT_ERROR_ILLEGAL_SEQUENCE, |
| _("Invalid sequence in conversion input")); |
| goto err_out; |
| } |
| |
| if (c >= 0xd800 && c < 0xdc00) /* high surrogate */ |
| { |
| high_surrogate = c; |
| goto next1; |
| } |
| else |
| wc = c; |
| } |
| |
| /********** DIFFERENT for UTF8/UCS4 **********/ |
| n_bytes += sizeof (gunichar); |
| |
| next1: |
| in++; |
| } |
| |
| if (high_surrogate && !items_read) |
| { |
| g_set_error (error, G_CONVERT_ERROR, G_CONVERT_ERROR_PARTIAL_INPUT, |
| _("Partial character sequence at end of input")); |
| goto err_out; |
| } |
| |
| /* At this point, everything is valid, and we just need to convert |
| */ |
| /********** DIFFERENT for UTF8/UCS4 **********/ |
| result = g_malloc (n_bytes + 4); |
| |
| high_surrogate = 0; |
| out = result; |
| in = str; |
| while (out < result + n_bytes) |
| { |
| gunichar2 c = *in; |
| gunichar wc; |
| |
| if (c >= 0xdc00 && c < 0xe000) /* low surrogate */ |
| { |
| wc = SURROGATE_VALUE (high_surrogate, c); |
| high_surrogate = 0; |
| } |
| else if (c >= 0xd800 && c < 0xdc00) /* high surrogate */ |
| { |
| high_surrogate = c; |
| goto next2; |
| } |
| else |
| wc = c; |
| |
| /********** DIFFERENT for UTF8/UCS4 **********/ |
| *(gunichar *)out = wc; |
| out += sizeof (gunichar); |
| |
| next2: |
| in++; |
| } |
| |
| /********** DIFFERENT for UTF8/UCS4 **********/ |
| *(gunichar *)out = 0; |
| |
| if (items_written) |
| /********** DIFFERENT for UTF8/UCS4 **********/ |
| *items_written = (out - result) / sizeof (gunichar); |
| |
| err_out: |
| if (items_read) |
| *items_read = in - str; |
| |
| return (gunichar *)result; |
| } |
| |
| /** |
| * g_utf8_to_utf16: |
| * @str: a UTF-8 encoded string |
| * @len: the maximum length of @str to use. If @len < 0, then |
| * the string is nul-terminated. |
| * @items_read: location to store number of bytes read, or %NULL. |
| * If %NULL, then %G_CONVERT_ERROR_PARTIAL_INPUT will be |
| * returned in case @str contains a trailing partial |
| * character. If an error occurs then the index of the |
| * invalid input is stored here. |
| * @items_written: location to store number of words written, or %NULL. |
| * The value stored here does not include the trailing |
| * 0 word. |
| * @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 UTF-8 to UTF-16. A 0 word will be |
| * added to the result after the converted text. |
| * |
| * Return value: a pointer to a newly allocated UTF-16 string. |
| * This value must be freed with g_free(). If an |
| * error occurs, %NULL will be returned and |
| * @error set. |
| **/ |
| gunichar2 * |
| g_utf8_to_utf16 (const gchar *str, |
| glong len, |
| glong *items_read, |
| glong *items_written, |
| GError **error) |
| { |
| gunichar2 *result = NULL; |
| gint n16; |
| const gchar *in; |
| gint i; |
| |
| g_return_val_if_fail (str != NULL, NULL); |
| |
| in = str; |
| n16 = 0; |
| while ((len < 0 || str + len - in > 0) && *in) |
| { |
| gunichar wc = g_utf8_get_char_extended (in, str + len - in); |
| if (wc & 0x80000000) |
| { |
| if (wc == (gunichar)-2) |
| { |
| if (items_read) |
| break; |
| else |
| g_set_error (error, G_CONVERT_ERROR, G_CONVERT_ERROR_PARTIAL_INPUT, |
| _("Partial character sequence at end of input")); |
| } |
| else |
| g_set_error (error, G_CONVERT_ERROR, G_CONVERT_ERROR_ILLEGAL_SEQUENCE, |
| _("Invalid byte sequence in conversion input")); |
| |
| goto err_out; |
| } |
| |
| if (wc < 0xd800) |
| n16 += 1; |
| else if (wc < 0xe000) |
| { |
| g_set_error (error, G_CONVERT_ERROR, G_CONVERT_ERROR_ILLEGAL_SEQUENCE, |
| _("Invalid sequence in conversion input")); |
| |
| goto err_out; |
| } |
| else if (wc < 0x10000) |
| n16 += 1; |
| else if (wc < 0x110000) |
| n16 += 2; |
| else |
| { |
| g_set_error (error, G_CONVERT_ERROR, G_CONVERT_ERROR_ILLEGAL_SEQUENCE, |
| _("Character out of range for UTF-16")); |
| |
| goto err_out; |
| } |
| |
| in = g_utf8_next_char (in); |
| } |
| |
| result = g_new (gunichar2, n16 + 1); |
| |
| in = str; |
| for (i = 0; i < n16;) |
| { |
| gunichar wc = g_utf8_get_char (in); |
| |
| if (wc < 0x10000) |
| { |
| result[i++] = wc; |
| } |
| else |
| { |
| result[i++] = (wc - 0x10000) / 0x400 + 0xd800; |
| result[i++] = (wc - 0x10000) % 0x400 + 0xdc00; |
| } |
| |
| in = g_utf8_next_char (in); |
| } |
| |
| result[i] = 0; |
| |
| if (items_written) |
| *items_written = n16; |
| |
| err_out: |
| if (items_read) |
| *items_read = in - str; |
| |
| return result; |
| } |
| |
| /** |
| * g_ucs4_to_utf16: |
| * @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 bytes read, or %NULL. |
| * If an error occurs then the index of the invalid input |
| * is stored here. |
| * @items_written: location to store number of words written, or %NULL. |
| * The value stored here does not include the trailing |
| * 0 word. |
| * @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 UCS-4 to UTF-16. A 0 word will be |
| * added to the result after the converted text. |
| * |
| * Return value: a pointer to a newly allocated UTF-16 string. |
| * This value must be freed with g_free(). If an |
| * error occurs, %NULL will be returned and |
| * @error set. |
| **/ |
| gunichar2 * |
| g_ucs4_to_utf16 (const gunichar *str, |
| glong len, |
| glong *items_read, |
| glong *items_written, |
| GError **error) |
| { |
| gunichar2 *result = NULL; |
| gint n16; |
| gint i, j; |
| |
| n16 = 0; |
| i = 0; |
| while ((len < 0 || i < len) && str[i]) |
| { |
| gunichar wc = str[i]; |
| |
| if (wc < 0xd800) |
| n16 += 1; |
| else if (wc < 0xe000) |
| { |
| g_set_error (error, G_CONVERT_ERROR, G_CONVERT_ERROR_ILLEGAL_SEQUENCE, |
| _("Invalid sequence in conversion input")); |
| |
| goto err_out; |
| } |
| else if (wc < 0x10000) |
| n16 += 1; |
| else if (wc < 0x110000) |
| n16 += 2; |
| else |
| { |
| g_set_error (error, G_CONVERT_ERROR, G_CONVERT_ERROR_ILLEGAL_SEQUENCE, |
| _("Character out of range for UTF-16")); |
| |
| goto err_out; |
| } |
| |
| i++; |
| } |
| |
| result = g_new (gunichar2, n16 + 1); |
| |
| for (i = 0, j = 0; j < n16; i++) |
| { |
| gunichar wc = str[i]; |
| |
| if (wc < 0x10000) |
| { |
| result[j++] = wc; |
| } |
| else |
| { |
| result[j++] = (wc - 0x10000) / 0x400 + 0xd800; |
| result[j++] = (wc - 0x10000) % 0x400 + 0xdc00; |
| } |
| } |
| result[j] = 0; |
| |
| if (items_written) |
| *items_written = n16; |
| |
| err_out: |
| if (items_read) |
| *items_read = i; |
| |
| return result; |
| } |
| |
| /** |
| * g_utf8_validate: |
| * @str: a pointer to character data |
| * @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). |
| * |
| * Returns %TRUE if all of @str was valid. Many GLib and GTK+ |
| * routines <emphasis>require</emphasis> valid UTF-8 as input; |
| * so data read from a file or the network should be checked |
| * with g_utf8_validate() before doing anything else with it. |
| * |
| * Return value: %TRUE if the text was valid UTF-8 |
| **/ |
| gboolean |
| g_utf8_validate (const gchar *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 (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') |
| return FALSE; |
| else |
| return TRUE; |
| } |
| |
| /** |
| * g_unichar_validate: |
| * @ch: a Unicode character |
| * |
| * Checks whether @ch is a valid Unicode character. Some possible |
| * integer values of @ch will not be valid. 0 is considered a valid |
| * character, though it's normally a string terminator. |
| * |
| * Return value: %TRUE if @ch is a valid Unicode character |
| **/ |
| gboolean |
| g_unichar_validate (gunichar ch) |
| { |
| return UNICODE_VALID (ch); |
| } |
| |
| /** |
| * g_utf8_strreverse: |
| * @str: a UTF-8 encoded string |
| * @len: the maximum length of @str to use. If @len < 0, then |
| * the string is nul-terminated. |
| * |
| * Reverses a UTF-8 string. @str must be valid UTF-8 encoded text. |
| * (Use g_utf8_validate() on all text before trying to use UTF-8 |
| * utility functions with it.) |
| * |
| * Note that unlike g_strreverse(), this function returns |
| * newly-allocated memory, which should be freed with g_free() when |
| * no longer needed. |
| * |
| * Returns: a newly-allocated string which is the reverse of @str. |
| * |
| * Since: 2.2 |
| */ |
| gchar * |
| g_utf8_strreverse (const gchar *str, |
| gssize len) |
| { |
| gchar *result; |
| const gchar *p; |
| gchar *m, *r, skip; |
| |
| if (len < 0) |
| len = strlen (str); |
| |
| result = g_new (gchar, len + 1); |
| r = result + len; |
| p = str; |
| while (*p) |
| { |
| skip = g_utf8_skip[*(guchar*)p]; |
| r -= skip; |
| for (m = r; skip; skip--) |
| *m++ = *p++; |
| } |
| result[len] = 0; |
| |
| return result; |
| } |