/* 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 #include #ifdef HAVE_CODESET #include #endif #include #include "glib.h" #ifdef G_PLATFORM_WIN32 #include #define STRICT #include #undef STRICT #endif #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, 3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,4,4,4,4,4,4,4,4,5,5,5,5,6,6,0,0 }; 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 strncpy() 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; } static gboolean g_utf8_get_charset_internal (char **a) { char *charset = getenv("CHARSET"); if (charset && a && ! *a) *a = charset; if (charset && strstr (charset, "UTF-8")) return TRUE; #ifdef HAVE_CODESET charset = nl_langinfo(CODESET); if (charset) { if (a && ! *a) *a = charset; if (strcmp (charset, "UTF-8") == 0) return TRUE; } #endif #if 0 /* #ifdef _NL_CTYPE_CODESET_NAME */ charset = nl_langinfo (_NL_CTYPE_CODESET_NAME); if (charset) { if (a && ! *a) *a = charset; if (strcmp (charset, "UTF-8") == 0) return TRUE; } #endif #ifdef G_PLATFORM_WIN32 if (a && ! *a) { static char codepage[10]; sprintf (codepage, "CP%d", GetACP ()); *a = codepage; /* What about codepage 1200? Is that UTF-8? */ return FALSE; } #else if (a && ! *a) *a = "US-ASCII"; #endif /* Assume this for compatibility at present. */ return FALSE; } static int utf8_locale_cache = -1; static char *utf8_charset_cache = NULL; /** * 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) { if (utf8_locale_cache != -1) { if (charset) *charset = utf8_charset_cache; return utf8_locale_cache; } utf8_locale_cache = g_utf8_get_charset_internal (&utf8_charset_cache); if (charset) *charset = utf8_charset_cache; return utf8_locale_cache; } /* 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 require 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); }