diff options
Diffstat (limited to 'source/blender/blenlib/intern/string_utf8.c')
| -rw-r--r-- | source/blender/blenlib/intern/string_utf8.c | 292 |
1 files changed, 205 insertions, 87 deletions
diff --git a/source/blender/blenlib/intern/string_utf8.c b/source/blender/blenlib/intern/string_utf8.c index f331d13e580..b1ad04eb70d 100644 --- a/source/blender/blenlib/intern/string_utf8.c +++ b/source/blender/blenlib/intern/string_utf8.c @@ -18,6 +18,8 @@ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. * * The Original Code is Copyright (C) 2011 Blender Foundation. + * Code from gutf8.c Copyright (C) 1999 Tom Tromey + * Copyright (C) 2000 Red Hat, Inc. * All rights reserved. * * Contributor(s): Campbell Barton. @@ -34,7 +36,7 @@ #include <wchar.h> #include <wctype.h> -#include "BLI_string.h" +#include "BLI_string_utf8.h" /* from libswish3, originally called u8_isvalid(), * modified to return the index of the bad character (byte index not utf). @@ -189,45 +191,11 @@ char *BLI_strncpy_utf8(char *dst, const char *src, size_t maxncpy) /* --------------------------------------------------------------------------*/ /* wchar_t / utf8 functions */ -/* UTF-8 <-> wchar transformations */ -static size_t chtoutf8(const unsigned long c, char o[4]) -{ - // Variables and initialization -/* memset(o, 0, 4); */ - - // Create the utf-8 string - if (c < 0x80) { - o[0] = (char) c; - return 1; - } - else if (c < 0x800) { - o[0] = (0xC0 | (c>>6)); - o[1] = (0x80 | (c & 0x3f)); - return 2; - } - else if (c < 0x10000) { - o[0] = (0xe0 | (c >> 12)); - o[1] = (0x80 | (c >>6 & 0x3f)); - o[2] = (0x80 | (c & 0x3f)); - return 3; - } - else if (c < 0x200000) { - o[0] = (0xf0 | (c>>18)); - o[1] = (0x80 | (c >>12 & 0x3f)); - o[2] = (0x80 | (c >> 6 & 0x3f)); - o[3] = (0x80 | (c & 0x3f)); - return 4; - } - - /* should we assert here? */ - return 0; -} - size_t BLI_strncpy_wchar_as_utf8(char *dst, const wchar_t *src, const size_t maxcpy) { size_t len = 0; while(*src && len < maxcpy) { /* XXX can still run over the buffer because utf8 size isnt known :| */ - len += chtoutf8(*src++, dst+len); + len += BLI_str_utf8_from_unicode(*src++, dst+len); } dst[len]= '\0'; @@ -238,11 +206,10 @@ size_t BLI_strncpy_wchar_as_utf8(char *dst, const wchar_t *src, const size_t max /* wchar len in utf8 */ size_t BLI_wstrlen_utf8(const wchar_t *src) { - char ch_dummy[4]; size_t len = 0; while(*src) { - len += chtoutf8(*src++, ch_dummy); + len += BLI_str_utf8_from_unicode(*src++, NULL); } return len; @@ -272,26 +239,6 @@ size_t BLI_strlen_utf8(const char *strc) return len; } - -/* Converts Unicode to wchar - -According to RFC 3629 "UTF-8, a transformation format of ISO 10646" -(http://tools.ietf.org/html/rfc3629), the valid UTF-8 encoding are: - - Char. number range | UTF-8 octet sequence - (hexadecimal) | (binary) - --------------------+--------------------------------------------- - 0000 0000-0000 007F | 0xxxxxxx - 0000 0080-0000 07FF | 110xxxxx 10xxxxxx - 0000 0800-0000 FFFF | 1110xxxx 10xxxxxx 10xxxxxx - 0001 0000-0010 FFFF | 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx - -If the encoding incidated by the first character is incorrect (because the -1 to 3 following characters do not match 10xxxxxx), the output is a '?' and -only a single input character is consumed. - -*/ - size_t BLI_strncpy_wchar_from_utf8(wchar_t *dst_w, const char *src_c, const size_t maxcpy) { int len=0; @@ -299,32 +246,16 @@ size_t BLI_strncpy_wchar_from_utf8(wchar_t *dst_w, const char *src_c, const size if(dst_w==NULL || src_c==NULL) return(0); while(*src_c && len < maxcpy) { - if ((*src_c & 0xe0) == 0xc0) { - if((src_c[1] & 0x80) && (src_c[1] & 0x40) == 0x00) { - *dst_w=((src_c[0] &0x1f)<<6) | (src_c[1]&0x3f); - src_c++; - } else { - *dst_w = '?'; - } - } else if ((*src_c & 0xf0) == 0xe0) { - if((src_c[1] & src_c[2] & 0x80) && ((src_c[1] | src_c[2]) & 0x40) == 0x00) { - *dst_w=((src_c[0] & 0x0f)<<12) | ((src_c[1]&0x3f)<<6) | (src_c[2]&0x3f); - src_c += 2; - } else { - *dst_w = '?'; - } - } else if ((*src_c & 0xf8) == 0xf0) { - if((src_c[1] & src_c[2] & src_c[3] & 0x80) && ((src_c[1] | src_c[2] | src_c[3]) & 0x40) == 0x00) { - *dst_w=((src_c[0] & 0x07)<<18) | ((src_c[1]&0x1f)<<12) | ((src_c[2]&0x3f)<<6) | (src_c[3]&0x3f); - src_c += 3; - } else { - *dst_w = '?'; - } - } else { - *dst_w=(src_c[0] & 0x7f); + size_t step= 0; + unsigned int unicode= BLI_str_utf8_as_unicode_and_size(src_c, &step); + if (unicode != BLI_UTF8_ERR) { + *dst_w= (wchar_t)unicode; + src_c += step; + } + else { + *dst_w = '?'; + src_c= BLI_str_find_next_char_utf8(src_c, NULL); } - - src_c++; dst_w++; len++; } @@ -334,13 +265,198 @@ size_t BLI_strncpy_wchar_from_utf8(wchar_t *dst_w, const char *src_c, const size /* end wchar_t / utf8 functions */ /* --------------------------------------------------------------------------*/ +/* copied from glib's gutf8.c */ + +/* note, glib uses unsigned int for unicode, best we do the same, + * though we dont typedef it - campbell */ + +#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; \ + } +/* same as glib define but added an 'Err' arg */ +#define UTF8_GET(Result, Chars, Count, Mask, Len, Err) \ + (Result) = (Chars)[0] & (Mask); \ + for ((Count) = 1; (Count) < (Len); ++(Count)) { \ + if (((Chars)[(Count)] & 0xc0) != 0x80) { \ + (Result) = Err; \ + break; \ + } \ + (Result) <<= 6; \ + (Result) |= ((Chars)[(Count)] & 0x3f); \ + } +/* was g_utf8_get_char */ +/** + * BLI_str_utf8_as_unicode: + * @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 + **/ +unsigned int BLI_str_utf8_as_unicode(const char *p) +{ + int i, mask = 0, len; + unsigned int result; + unsigned char c = (unsigned char) *p; + + UTF8_COMPUTE (c, mask, len); + if (len == -1) + return BLI_UTF8_ERR; + UTF8_GET (result, p, i, mask, len, BLI_UTF8_ERR); + + return result; +} + +/* varient that increments the length */ +unsigned int BLI_str_utf8_as_unicode_and_size(const char *p, size_t *index) +{ + int i, mask = 0, len; + unsigned int result; + unsigned char c = (unsigned char) *p; + + UTF8_COMPUTE (c, mask, len); + if (len == -1) + return BLI_UTF8_ERR; + UTF8_GET (result, p, i, mask, len, BLI_UTF8_ERR); + *index += len; + return result; +} + +/* another varient that steps over the index, + * note, currently this also falls back to latin1 for text drawing. */ +unsigned int BLI_str_utf8_as_unicode_step(const char *p, size_t *index) +{ + int i, mask = 0, len; + unsigned int result; + unsigned char c; + + p += *index; + c= (unsigned char) *p; + + UTF8_COMPUTE (c, mask, len); + if (len == -1) { + /* when called with NULL end, result will never be NULL, + * checks for a NULL character */ + char *p_next= BLI_str_find_next_char_utf8(p, NULL); + /* will never return the same pointer unless '\0', + * eternal loop is prevented */ + *index += (size_t)(p_next - p); + return BLI_UTF8_ERR; + } + + /* this is tricky since there are a few ways we can bail out of bad unicode + * values, 3 possible solutions. */ +#if 0 + UTF8_GET (result, p, i, mask, len, BLI_UTF8_ERR); +#elif 1 + /* WARNING: this is NOT part of glib, or supported by similar functions. + * this is added for text drawing because some filepaths can have latin1 + * characters */ + UTF8_GET (result, p, i, mask, len, BLI_UTF8_ERR); + if(result == BLI_UTF8_ERR) { + len= 1; + result= *p; + } + /* end warning! */ +#else + /* without a fallback like '?', text drawing will stop on this value */ + UTF8_GET (result, p, i, mask, len, '?'); +#endif + + *index += len; + return result; +} + +/* was g_unichar_to_utf8 */ +/** + * BLI_str_utf8_from_unicode: + * @c: a Unicode 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 + **/ +size_t BLI_str_utf8_from_unicode(unsigned int c, char *outbuf) +{ + /* If this gets modified, also update the copy in g_string_insert_unichar() */ + unsigned int 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; +} -/* copied from glib */ +/* was g_utf8_find_prev_char */ /** - * g_utf8_find_prev_char: + * BLI_str_find_prev_char_utf8: * @str: pointer to the beginning of a UTF-8 encoded string * @p: pointer to some position within @str * @@ -364,8 +480,9 @@ char * BLI_str_find_prev_char_utf8(const char *str, const char *p) return NULL; } +/* was g_utf8_find_next_char */ /** - * g_utf8_find_next_char: + * BLI_str_find_next_char_utf8: * @p: a pointer to a position within a UTF-8 encoded string * @end: a pointer to the byte following the end of the string, * or %NULL to indicate that the string is nul-terminated. @@ -395,8 +512,9 @@ char *BLI_str_find_next_char_utf8(const char *p, const char *end) return (p == end) ? NULL : (char *)p; } +/* was g_utf8_prev_char */ /** - * g_utf8_prev_char: + * BLI_str_prev_char_utf8: * @p: a pointer to a position within a UTF-8 encoded string * * Finds the previous UTF-8 character in the string before @p. |