/[pcre]/code/trunk/pcre_valid_utf8.c
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revision 606 by ph10, Mon Jun 6 17:46:22 2011 UTC revision 1098 by chpe, Tue Oct 16 15:56:18 2012 UTC
# Line 6  Line 6 
6  and semantics are as close as possible to those of the Perl 5 language.  and semantics are as close as possible to those of the Perl 5 language.
7    
8                         Written by Philip Hazel                         Written by Philip Hazel
9             Copyright (c) 1997-2009 University of Cambridge             Copyright (c) 1997-2012 University of Cambridge
10    
11  -----------------------------------------------------------------------------  -----------------------------------------------------------------------------
12  Redistribution and use in source and binary forms, with or without  Redistribution and use in source and binary forms, with or without
# Line 64  the range 0 to 0x7fffffff, up to 6 bytes Line 64  the range 0 to 0x7fffffff, up to 6 bytes
64  the canonical format. Once somebody had pointed out RFC 3629 to me (it  the canonical format. Once somebody had pointed out RFC 3629 to me (it
65  obsoletes 2279), additional restrictions were applied. The values are now  obsoletes 2279), additional restrictions were applied. The values are now
66  limited to be between 0 and 0x0010ffff, no more than 4 bytes long, and the  limited to be between 0 and 0x0010ffff, no more than 4 bytes long, and the
67  subrange 0xd000 to 0xdfff is excluded. However, the format of 5-byte and 6-byte  subrange 0xd000 to 0xdfff is excluded. However, the format of 5-byte and 6-byte
68  characters is still checked.  characters is still checked.
69    
70  From release 8.13 more information about the details of the error are passed  From release 8.13 more information about the details of the error are passed
71  back in the returned value:  back in the returned value:
72    
73  PCRE_UTF8_ERR0   No error  PCRE_UTF8_ERR0   No error
# Line 92  PCRE_UTF8_ERR18  Overlong 5-byte sequenc Line 92  PCRE_UTF8_ERR18  Overlong 5-byte sequenc
92  PCRE_UTF8_ERR19  Overlong 6-byte sequence (won't ever occur)  PCRE_UTF8_ERR19  Overlong 6-byte sequence (won't ever occur)
93  PCRE_UTF8_ERR20  Isolated 0x80 byte (not within UTF-8 character)  PCRE_UTF8_ERR20  Isolated 0x80 byte (not within UTF-8 character)
94  PCRE_UTF8_ERR21  Byte with the illegal value 0xfe or 0xff  PCRE_UTF8_ERR21  Byte with the illegal value 0xfe or 0xff
95    PCRE_UTF8_ERR22  Non-character
96    
97  Arguments:  Arguments:
98    string       points to the string    string       points to the string
99    length       length of string, or -1 if the string is zero-terminated    length       length of string, or -1 if the string is zero-terminated
100    errp         pointer to an error position offset variable    errp         pointer to an error position offset variable
101    
102  Returns:       = 0    if the string is a valid UTF-8 string  Returns:       = 0    if the string is a valid UTF-8 string
103                 > 0    otherwise, setting the offset of the bad character                 > 0    otherwise, setting the offset of the bad character
104  */  */
105    
106  int  int
107  _pcre_valid_utf8(USPTR string, int length, int *erroroffset)  PRIV(valid_utf)(PCRE_PUCHAR string, int length, int *erroroffset)
108  {  {
109  #ifdef SUPPORT_UTF8  #ifdef SUPPORT_UTF
110  register USPTR p;  register PCRE_PUCHAR p;
111    
112  if (length < 0)  if (length < 0)
113    {    {
114    for (p = string; *p != 0; p++);    for (p = string; *p != 0; p++);
115    length = p - string;    length = (int)(p - string);
116    }    }
117    
118  for (p = string; length-- > 0; p++)  for (p = string; length-- > 0; p++)
119    {    {
120    register int ab, c, d;    register pcre_uchar ab, c, d;
121      pcre_uint32 v = 0;
122    
123    c = *p;    c = *p;
124    if (c < 128) continue;                /* ASCII character */    if (c < 128) continue;                /* ASCII character */
125    
126    if (c < 0xc0)                         /* Isolated 10xx xxxx byte */    if (c < 0xc0)                         /* Isolated 10xx xxxx byte */
127      {      {
128      *erroroffset = p - string;      *erroroffset = (int)(p - string);
129      return PCRE_UTF8_ERR20;      return PCRE_UTF8_ERR20;
130      }      }
131    
132    if (c >= 0xfe)                        /* Invalid 0xfe or 0xff bytes */    if (c >= 0xfe)                        /* Invalid 0xfe or 0xff bytes */
133      {      {
134      *erroroffset = p - string;      *erroroffset = (int)(p - string);
135      return PCRE_UTF8_ERR21;      return PCRE_UTF8_ERR21;
136      }      }
137    
138    ab = _pcre_utf8_table4[c & 0x3f];     /* Number of additional bytes */    ab = PRIV(utf8_table4)[c & 0x3f];     /* Number of additional bytes */
139    if (length < ab)    if (length < ab)
140      {      {
141      *erroroffset = p - string;          /* Missing bytes */      *erroroffset = (int)(p - string);          /* Missing bytes */
142      return ab - length;                 /* Codes ERR1 to ERR5 */      return ab - length;                 /* Codes ERR1 to ERR5 */
143      }      }
144    length -= ab;                         /* Length remaining */    length -= ab;                         /* Length remaining */
145    
146    /* Check top bits in the second byte */    /* Check top bits in the second byte */
147    
148    if (((d = *(++p)) & 0xc0) != 0x80)    if (((d = *(++p)) & 0xc0) != 0x80)
149      {      {
150      *erroroffset = p - string - 1;      *erroroffset = (int)(p - string) - 1;
151      return PCRE_UTF8_ERR6;      return PCRE_UTF8_ERR6;
152      }      }
153    
154    /* For each length, check that the remaining bytes start with the 0x80 bit    /* For each length, check that the remaining bytes start with the 0x80 bit
155    set and not the 0x40 bit. Then check for an overlong sequence, and for the    set and not the 0x40 bit. Then check for an overlong sequence, and for the
156    excluded range 0xd800 to 0xdfff. */    excluded range 0xd800 to 0xdfff. */
157    
# Line 157  for (p = string; length-- > 0; p++) Line 159  for (p = string; length-- > 0; p++)
159      {      {
160      /* 2-byte character. No further bytes to check for 0x80. Check first byte      /* 2-byte character. No further bytes to check for 0x80. Check first byte
161      for for xx00 000x (overlong sequence). */      for for xx00 000x (overlong sequence). */
162    
163      case 1: if ((c & 0x3e) == 0)      case 1: if ((c & 0x3e) == 0)
164        {        {
165        *erroroffset = p - string - 1;        *erroroffset = (int)(p - string) - 1;
166        return PCRE_UTF8_ERR15;        return PCRE_UTF8_ERR15;
167        }        }
168      break;      break;
169    
170      /* 3-byte character. Check third byte for 0x80. Then check first 2 bytes      /* 3-byte character. Check third byte for 0x80. Then check first 2 bytes
171        for 1110 0000, xx0x xxxx (overlong sequence) or        for 1110 0000, xx0x xxxx (overlong sequence) or
172            1110 1101, 1010 xxxx (0xd800 - 0xdfff) */            1110 1101, 1010 xxxx (0xd800 - 0xdfff) */
173    
174      case 2:      case 2:
175      if ((*(++p) & 0xc0) != 0x80)     /* Third byte */      if ((*(++p) & 0xc0) != 0x80)     /* Third byte */
176        {        {
177        *erroroffset = p - string - 2;        *erroroffset = (int)(p - string) - 2;
178        return PCRE_UTF8_ERR7;        return PCRE_UTF8_ERR7;
179        }        }
180      if (c == 0xe0 && (d & 0x20) == 0)      if (c == 0xe0 && (d & 0x20) == 0)
181        {        {
182        *erroroffset = p - string - 2;        *erroroffset = (int)(p - string) - 2;
183        return PCRE_UTF8_ERR16;        return PCRE_UTF8_ERR16;
184        }        }
185      if (c == 0xed && d >= 0xa0)      if (c == 0xed && d >= 0xa0)
186        {        {
187        *erroroffset = p - string - 2;        *erroroffset = (int)(p - string) - 2;
188        return PCRE_UTF8_ERR14;        return PCRE_UTF8_ERR14;
189        }        }
190        v = ((c & 0x0f) << 12) | ((d & 0x3f) << 6) | (*p & 0x3f);
191      break;      break;
192    
193      /* 4-byte character. Check 3rd and 4th bytes for 0x80. Then check first 2      /* 4-byte character. Check 3rd and 4th bytes for 0x80. Then check first 2
194         bytes for for 1111 0000, xx00 xxxx (overlong sequence), then check for a         bytes for for 1111 0000, xx00 xxxx (overlong sequence), then check for a
195         character greater than 0x0010ffff (f4 8f bf bf) */         character greater than 0x0010ffff (f4 8f bf bf) */
196    
197      case 3:      case 3:
198      if ((*(++p) & 0xc0) != 0x80)     /* Third byte */      if ((*(++p) & 0xc0) != 0x80)     /* Third byte */
199        {        {
200        *erroroffset = p - string - 2;        *erroroffset = (int)(p - string) - 2;
201        return PCRE_UTF8_ERR7;        return PCRE_UTF8_ERR7;
202        }        }
203      if ((*(++p) & 0xc0) != 0x80)     /* Fourth byte */      if ((*(++p) & 0xc0) != 0x80)     /* Fourth byte */
204        {        {
205        *erroroffset = p - string - 3;        *erroroffset = (int)(p - string) - 3;
206        return PCRE_UTF8_ERR8;        return PCRE_UTF8_ERR8;
207        }        }
208      if (c == 0xf0 && (d & 0x30) == 0)      if (c == 0xf0 && (d & 0x30) == 0)
209        {        {
210        *erroroffset = p - string - 3;        *erroroffset = (int)(p - string) - 3;
211        return PCRE_UTF8_ERR17;        return PCRE_UTF8_ERR17;
212        }        }
213      if (c > 0xf4 || (c == 0xf4 && d > 0x8f))      if (c > 0xf4 || (c == 0xf4 && d > 0x8f))
214        {        {
215        *erroroffset = p - string - 3;        *erroroffset = (int)(p - string) - 3;
216        return PCRE_UTF8_ERR13;        return PCRE_UTF8_ERR13;
217        }        }
218        v = ((c & 0x07) << 18) | ((d & 0x3f) << 12) | ((p[-1] & 0x3f) << 6) | (*p & 0x3f);
219      break;      break;
220    
221      /* 5-byte and 6-byte characters are not allowed by RFC 3629, and will be      /* 5-byte and 6-byte characters are not allowed by RFC 3629, and will be
222      rejected by the length test below. However, we do the appropriate tests      rejected by the length test below. However, we do the appropriate tests
223      here so that overlong sequences get diagnosed, and also in case there is      here so that overlong sequences get diagnosed, and also in case there is
224      ever an option for handling these larger code points. */      ever an option for handling these larger code points. */
225    
226      /* 5-byte character. Check 3rd, 4th, and 5th bytes for 0x80. Then check for      /* 5-byte character. Check 3rd, 4th, and 5th bytes for 0x80. Then check for
227      1111 1000, xx00 0xxx */      1111 1000, xx00 0xxx */
228    
229      case 4:      case 4:
230      if ((*(++p) & 0xc0) != 0x80)     /* Third byte */      if ((*(++p) & 0xc0) != 0x80)     /* Third byte */
231        {        {
232        *erroroffset = p - string - 2;        *erroroffset = (int)(p - string) - 2;
233        return PCRE_UTF8_ERR7;        return PCRE_UTF8_ERR7;
234        }        }
235      if ((*(++p) & 0xc0) != 0x80)     /* Fourth byte */      if ((*(++p) & 0xc0) != 0x80)     /* Fourth byte */
236        {        {
237        *erroroffset = p - string - 3;        *erroroffset = (int)(p - string) - 3;
238        return PCRE_UTF8_ERR8;        return PCRE_UTF8_ERR8;
239        }        }
240      if ((*(++p) & 0xc0) != 0x80)     /* Fifth byte */      if ((*(++p) & 0xc0) != 0x80)     /* Fifth byte */
241        {        {
242        *erroroffset = p - string - 4;        *erroroffset = (int)(p - string) - 4;
243        return PCRE_UTF8_ERR9;        return PCRE_UTF8_ERR9;
244        }        }
245      if (c == 0xf8 && (d & 0x38) == 0)      if (c == 0xf8 && (d & 0x38) == 0)
246        {        {
247        *erroroffset = p - string - 4;        *erroroffset = (int)(p - string) - 4;
248        return PCRE_UTF8_ERR18;        return PCRE_UTF8_ERR18;
249        }        }
250      break;      break;
251    
252      /* 6-byte character. Check 3rd-6th bytes for 0x80. Then check for      /* 6-byte character. Check 3rd-6th bytes for 0x80. Then check for
# Line 251  for (p = string; length-- > 0; p++) Line 255  for (p = string; length-- > 0; p++)
255      case 5:      case 5:
256      if ((*(++p) & 0xc0) != 0x80)     /* Third byte */      if ((*(++p) & 0xc0) != 0x80)     /* Third byte */
257        {        {
258        *erroroffset = p - string - 2;        *erroroffset = (int)(p - string) - 2;
259        return PCRE_UTF8_ERR7;        return PCRE_UTF8_ERR7;
260        }        }
261      if ((*(++p) & 0xc0) != 0x80)     /* Fourth byte */      if ((*(++p) & 0xc0) != 0x80)     /* Fourth byte */
262        {        {
263        *erroroffset = p - string - 3;        *erroroffset = (int)(p - string) - 3;
264        return PCRE_UTF8_ERR8;        return PCRE_UTF8_ERR8;
265        }        }
266      if ((*(++p) & 0xc0) != 0x80)     /* Fifth byte */      if ((*(++p) & 0xc0) != 0x80)     /* Fifth byte */
267        {        {
268        *erroroffset = p - string - 4;        *erroroffset = (int)(p - string) - 4;
269        return PCRE_UTF8_ERR9;        return PCRE_UTF8_ERR9;
270        }        }
271      if ((*(++p) & 0xc0) != 0x80)     /* Sixth byte */      if ((*(++p) & 0xc0) != 0x80)     /* Sixth byte */
272        {        {
273        *erroroffset = p - string - 5;        *erroroffset = (int)(p - string) - 5;
274        return PCRE_UTF8_ERR10;        return PCRE_UTF8_ERR10;
275        }        }
276      if (c == 0xfc && (d & 0x3c) == 0)      if (c == 0xfc && (d & 0x3c) == 0)
277        {        {
278        *erroroffset = p - string - 5;        *erroroffset = (int)(p - string) - 5;
279        return PCRE_UTF8_ERR19;        return PCRE_UTF8_ERR19;
280        }        }
281      break;      break;
282      }      }
283    
284    /* Character is valid under RFC 2279, but 4-byte and 5-byte characters are    /* Character is valid under RFC 2279, but 4-byte and 5-byte characters are
285    excluded by RFC 3629. The pointer p is currently at the last byte of the    excluded by RFC 3629. The pointer p is currently at the last byte of the
286    character. */    character. */
287    
288    if (ab > 3)    if (ab > 3)
289      {      {
290      *erroroffset = p - string - ab;      *erroroffset = (int)(p - string) - ab;
291      return (ab == 4)? PCRE_UTF8_ERR11 : PCRE_UTF8_ERR12;      return (ab == 4)? PCRE_UTF8_ERR11 : PCRE_UTF8_ERR12;
292      }      }
293    
294      /* Reject non-characters. The pointer p is currently at the last byte of the
295      character. */
296      if ((v & 0xfffeu) == 0xfffeu || (v >= 0xfdd0 && v <= 0xfdef))
297        {
298        *erroroffset = (int)(p - string) - ab;
299        return PCRE_UTF8_ERR22;
300        }
301    }    }
302    
303  #else  /* SUPPORT_UTF8 */  #else  /* Not SUPPORT_UTF */
304  (void)(string);  /* Keep picky compilers happy */  (void)(string);  /* Keep picky compilers happy */
305  (void)(length);  (void)(length);
306    (void)(erroroffset);
307  #endif  #endif
308    
309  return PCRE_UTF8_ERR0;   /* This indicates success */  return PCRE_UTF8_ERR0;   /* This indicates success */

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