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authorVincent Peyruqueou2023-03-27 11:46:59 +0200
committerVincent Peyruqueou2023-03-27 11:46:59 +0200
commit0916b5f9072f7bd1b7b045ceb07758f9dc097ac2 (patch)
tree2904afe1d5d4d770695f78db5ccd722735a8e67b /pcre/pcre_valid_utf8.c
parent5443d6828eaf5cbc7dc4613d9d75b4c192d17730 (diff)
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Add sources of PCRE and Microsoft Visual Studio solutions to compile the libHEADmaster
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+/*************************************************
+* Perl-Compatible Regular Expressions *
+*************************************************/
+
+/* PCRE is a library of functions to support regular expressions whose syntax
+and semantics are as close as possible to those of the Perl 5 language.
+
+ Written by Philip Hazel
+ Copyright (c) 1997-2013 University of Cambridge
+
+-----------------------------------------------------------------------------
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+ * Redistributions of source code must retain the above copyright notice,
+ this list of conditions and the following disclaimer.
+
+ * Redistributions in binary form must reproduce the above copyright
+ notice, this list of conditions and the following disclaimer in the
+ documentation and/or other materials provided with the distribution.
+
+ * Neither the name of the University of Cambridge nor the names of its
+ contributors may be used to endorse or promote products derived from
+ this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+-----------------------------------------------------------------------------
+*/
+
+
+/* This module contains an internal function for validating UTF-8 character
+strings. */
+
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "pcre_internal.h"
+
+
+/*************************************************
+* Validate a UTF-8 string *
+*************************************************/
+
+/* This function is called (optionally) at the start of compile or match, to
+check that a supposed UTF-8 string is actually valid. The early check means
+that subsequent code can assume it is dealing with a valid string. The check
+can be turned off for maximum performance, but the consequences of supplying an
+invalid string are then undefined.
+
+Originally, this function checked according to RFC 2279, allowing for values in
+the range 0 to 0x7fffffff, up to 6 bytes long, but ensuring that they were in
+the canonical format. Once somebody had pointed out RFC 3629 to me (it
+obsoletes 2279), additional restrictions were applied. The values are now
+limited to be between 0 and 0x0010ffff, no more than 4 bytes long, and the
+subrange 0xd000 to 0xdfff is excluded. However, the format of 5-byte and 6-byte
+characters is still checked.
+
+From release 8.13 more information about the details of the error are passed
+back in the returned value:
+
+PCRE_UTF8_ERR0 No error
+PCRE_UTF8_ERR1 Missing 1 byte at the end of the string
+PCRE_UTF8_ERR2 Missing 2 bytes at the end of the string
+PCRE_UTF8_ERR3 Missing 3 bytes at the end of the string
+PCRE_UTF8_ERR4 Missing 4 bytes at the end of the string
+PCRE_UTF8_ERR5 Missing 5 bytes at the end of the string
+PCRE_UTF8_ERR6 2nd-byte's two top bits are not 0x80
+PCRE_UTF8_ERR7 3rd-byte's two top bits are not 0x80
+PCRE_UTF8_ERR8 4th-byte's two top bits are not 0x80
+PCRE_UTF8_ERR9 5th-byte's two top bits are not 0x80
+PCRE_UTF8_ERR10 6th-byte's two top bits are not 0x80
+PCRE_UTF8_ERR11 5-byte character is not permitted by RFC 3629
+PCRE_UTF8_ERR12 6-byte character is not permitted by RFC 3629
+PCRE_UTF8_ERR13 4-byte character with value > 0x10ffff is not permitted
+PCRE_UTF8_ERR14 3-byte character with value 0xd000-0xdfff is not permitted
+PCRE_UTF8_ERR15 Overlong 2-byte sequence
+PCRE_UTF8_ERR16 Overlong 3-byte sequence
+PCRE_UTF8_ERR17 Overlong 4-byte sequence
+PCRE_UTF8_ERR18 Overlong 5-byte sequence (won't ever occur)
+PCRE_UTF8_ERR19 Overlong 6-byte sequence (won't ever occur)
+PCRE_UTF8_ERR20 Isolated 0x80 byte (not within UTF-8 character)
+PCRE_UTF8_ERR21 Byte with the illegal value 0xfe or 0xff
+PCRE_UTF8_ERR22 Unused (was non-character)
+
+Arguments:
+ string points to the string
+ length length of string, or -1 if the string is zero-terminated
+ errp pointer to an error position offset variable
+
+Returns: = 0 if the string is a valid UTF-8 string
+ > 0 otherwise, setting the offset of the bad character
+*/
+
+int
+PRIV(valid_utf)(PCRE_PUCHAR string, int length, int *erroroffset)
+{
+#ifdef SUPPORT_UTF
+register PCRE_PUCHAR p;
+
+if (length < 0)
+ {
+ for (p = string; *p != 0; p++);
+ length = (int)(p - string);
+ }
+
+for (p = string; length-- > 0; p++)
+ {
+ register pcre_uchar ab, c, d;
+
+ c = *p;
+ if (c < 128) continue; /* ASCII character */
+
+ if (c < 0xc0) /* Isolated 10xx xxxx byte */
+ {
+ *erroroffset = (int)(p - string);
+ return PCRE_UTF8_ERR20;
+ }
+
+ if (c >= 0xfe) /* Invalid 0xfe or 0xff bytes */
+ {
+ *erroroffset = (int)(p - string);
+ return PCRE_UTF8_ERR21;
+ }
+
+ ab = PRIV(utf8_table4)[c & 0x3f]; /* Number of additional bytes */
+ if (length < ab)
+ {
+ *erroroffset = (int)(p - string); /* Missing bytes */
+ return ab - length; /* Codes ERR1 to ERR5 */
+ }
+ length -= ab; /* Length remaining */
+
+ /* Check top bits in the second byte */
+
+ if (((d = *(++p)) & 0xc0) != 0x80)
+ {
+ *erroroffset = (int)(p - string) - 1;
+ return PCRE_UTF8_ERR6;
+ }
+
+ /* For each length, check that the remaining bytes start with the 0x80 bit
+ set and not the 0x40 bit. Then check for an overlong sequence, and for the
+ excluded range 0xd800 to 0xdfff. */
+
+ switch (ab)
+ {
+ /* 2-byte character. No further bytes to check for 0x80. Check first byte
+ for for xx00 000x (overlong sequence). */
+
+ case 1: if ((c & 0x3e) == 0)
+ {
+ *erroroffset = (int)(p - string) - 1;
+ return PCRE_UTF8_ERR15;
+ }
+ break;
+
+ /* 3-byte character. Check third byte for 0x80. Then check first 2 bytes
+ for 1110 0000, xx0x xxxx (overlong sequence) or
+ 1110 1101, 1010 xxxx (0xd800 - 0xdfff) */
+
+ case 2:
+ if ((*(++p) & 0xc0) != 0x80) /* Third byte */
+ {
+ *erroroffset = (int)(p - string) - 2;
+ return PCRE_UTF8_ERR7;
+ }
+ if (c == 0xe0 && (d & 0x20) == 0)
+ {
+ *erroroffset = (int)(p - string) - 2;
+ return PCRE_UTF8_ERR16;
+ }
+ if (c == 0xed && d >= 0xa0)
+ {
+ *erroroffset = (int)(p - string) - 2;
+ return PCRE_UTF8_ERR14;
+ }
+ break;
+
+ /* 4-byte character. Check 3rd and 4th bytes for 0x80. Then check first 2
+ bytes for for 1111 0000, xx00 xxxx (overlong sequence), then check for a
+ character greater than 0x0010ffff (f4 8f bf bf) */
+
+ case 3:
+ if ((*(++p) & 0xc0) != 0x80) /* Third byte */
+ {
+ *erroroffset = (int)(p - string) - 2;
+ return PCRE_UTF8_ERR7;
+ }
+ if ((*(++p) & 0xc0) != 0x80) /* Fourth byte */
+ {
+ *erroroffset = (int)(p - string) - 3;
+ return PCRE_UTF8_ERR8;
+ }
+ if (c == 0xf0 && (d & 0x30) == 0)
+ {
+ *erroroffset = (int)(p - string) - 3;
+ return PCRE_UTF8_ERR17;
+ }
+ if (c > 0xf4 || (c == 0xf4 && d > 0x8f))
+ {
+ *erroroffset = (int)(p - string) - 3;
+ return PCRE_UTF8_ERR13;
+ }
+ break;
+
+ /* 5-byte and 6-byte characters are not allowed by RFC 3629, and will be
+ rejected by the length test below. However, we do the appropriate tests
+ here so that overlong sequences get diagnosed, and also in case there is
+ ever an option for handling these larger code points. */
+
+ /* 5-byte character. Check 3rd, 4th, and 5th bytes for 0x80. Then check for
+ 1111 1000, xx00 0xxx */
+
+ case 4:
+ if ((*(++p) & 0xc0) != 0x80) /* Third byte */
+ {
+ *erroroffset = (int)(p - string) - 2;
+ return PCRE_UTF8_ERR7;
+ }
+ if ((*(++p) & 0xc0) != 0x80) /* Fourth byte */
+ {
+ *erroroffset = (int)(p - string) - 3;
+ return PCRE_UTF8_ERR8;
+ }
+ if ((*(++p) & 0xc0) != 0x80) /* Fifth byte */
+ {
+ *erroroffset = (int)(p - string) - 4;
+ return PCRE_UTF8_ERR9;
+ }
+ if (c == 0xf8 && (d & 0x38) == 0)
+ {
+ *erroroffset = (int)(p - string) - 4;
+ return PCRE_UTF8_ERR18;
+ }
+ break;
+
+ /* 6-byte character. Check 3rd-6th bytes for 0x80. Then check for
+ 1111 1100, xx00 00xx. */
+
+ case 5:
+ if ((*(++p) & 0xc0) != 0x80) /* Third byte */
+ {
+ *erroroffset = (int)(p - string) - 2;
+ return PCRE_UTF8_ERR7;
+ }
+ if ((*(++p) & 0xc0) != 0x80) /* Fourth byte */
+ {
+ *erroroffset = (int)(p - string) - 3;
+ return PCRE_UTF8_ERR8;
+ }
+ if ((*(++p) & 0xc0) != 0x80) /* Fifth byte */
+ {
+ *erroroffset = (int)(p - string) - 4;
+ return PCRE_UTF8_ERR9;
+ }
+ if ((*(++p) & 0xc0) != 0x80) /* Sixth byte */
+ {
+ *erroroffset = (int)(p - string) - 5;
+ return PCRE_UTF8_ERR10;
+ }
+ if (c == 0xfc && (d & 0x3c) == 0)
+ {
+ *erroroffset = (int)(p - string) - 5;
+ return PCRE_UTF8_ERR19;
+ }
+ break;
+ }
+
+ /* Character is valid under RFC 2279, but 4-byte and 5-byte characters are
+ excluded by RFC 3629. The pointer p is currently at the last byte of the
+ character. */
+
+ if (ab > 3)
+ {
+ *erroroffset = (int)(p - string) - ab;
+ return (ab == 4)? PCRE_UTF8_ERR11 : PCRE_UTF8_ERR12;
+ }
+ }
+
+#else /* Not SUPPORT_UTF */
+(void)(string); /* Keep picky compilers happy */
+(void)(length);
+(void)(erroroffset);
+#endif
+
+return PCRE_UTF8_ERR0; /* This indicates success */
+}
+
+/* End of pcre_valid_utf8.c */