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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) 1997-2014 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 that tests a compiled pattern to
+see if it was compiled with the opposite endianness. If so, it uses an
+auxiliary local function to flip the appropriate bytes. */
+
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "pcre_internal.h"
+
+
+/*************************************************
+* Swap byte functions *
+*************************************************/
+
+/* The following functions swap the bytes of a pcre_uint16
+and pcre_uint32 value.
+
+Arguments:
+ value any number
+
+Returns: the byte swapped value
+*/
+
+static pcre_uint32
+swap_uint32(pcre_uint32 value)
+{
+return ((value & 0x000000ff) << 24) |
+ ((value & 0x0000ff00) << 8) |
+ ((value & 0x00ff0000) >> 8) |
+ (value >> 24);
+}
+
+static pcre_uint16
+swap_uint16(pcre_uint16 value)
+{
+return (value >> 8) | (value << 8);
+}
+
+
+/*************************************************
+* Test for a byte-flipped compiled regex *
+*************************************************/
+
+/* This function swaps the bytes of a compiled pattern usually
+loaded form the disk. It also sets the tables pointer, which
+is likely an invalid pointer after reload.
+
+Arguments:
+ argument_re points to the compiled expression
+ extra_data points to extra data or is NULL
+ tables points to the character tables or NULL
+
+Returns: 0 if the swap is successful, negative on error
+*/
+
+#if defined COMPILE_PCRE8
+PCRE_EXP_DECL int pcre_pattern_to_host_byte_order(pcre *argument_re,
+ pcre_extra *extra_data, const unsigned char *tables)
+#elif defined COMPILE_PCRE16
+PCRE_EXP_DECL int pcre16_pattern_to_host_byte_order(pcre16 *argument_re,
+ pcre16_extra *extra_data, const unsigned char *tables)
+#elif defined COMPILE_PCRE32
+PCRE_EXP_DECL int pcre32_pattern_to_host_byte_order(pcre32 *argument_re,
+ pcre32_extra *extra_data, const unsigned char *tables)
+#endif
+{
+REAL_PCRE *re = (REAL_PCRE *)argument_re;
+pcre_study_data *study;
+#ifndef COMPILE_PCRE8
+pcre_uchar *ptr;
+int length;
+#if defined SUPPORT_UTF && defined COMPILE_PCRE16
+BOOL utf;
+BOOL utf16_char;
+#endif /* SUPPORT_UTF && COMPILE_PCRE16 */
+#endif /* !COMPILE_PCRE8 */
+
+if (re == NULL) return PCRE_ERROR_NULL;
+if (re->magic_number == MAGIC_NUMBER)
+ {
+ if ((re->flags & PCRE_MODE) == 0) return PCRE_ERROR_BADMODE;
+ re->tables = tables;
+ return 0;
+ }
+
+if (re->magic_number != REVERSED_MAGIC_NUMBER) return PCRE_ERROR_BADMAGIC;
+if ((swap_uint32(re->flags) & PCRE_MODE) == 0) return PCRE_ERROR_BADMODE;
+
+re->magic_number = MAGIC_NUMBER;
+re->size = swap_uint32(re->size);
+re->options = swap_uint32(re->options);
+re->flags = swap_uint32(re->flags);
+re->limit_match = swap_uint32(re->limit_match);
+re->limit_recursion = swap_uint32(re->limit_recursion);
+
+#if defined COMPILE_PCRE8 || defined COMPILE_PCRE16
+re->first_char = swap_uint16(re->first_char);
+re->req_char = swap_uint16(re->req_char);
+#elif defined COMPILE_PCRE32
+re->first_char = swap_uint32(re->first_char);
+re->req_char = swap_uint32(re->req_char);
+#endif
+
+re->max_lookbehind = swap_uint16(re->max_lookbehind);
+re->top_bracket = swap_uint16(re->top_bracket);
+re->top_backref = swap_uint16(re->top_backref);
+re->name_table_offset = swap_uint16(re->name_table_offset);
+re->name_entry_size = swap_uint16(re->name_entry_size);
+re->name_count = swap_uint16(re->name_count);
+re->ref_count = swap_uint16(re->ref_count);
+re->tables = tables;
+
+if (extra_data != NULL && (extra_data->flags & PCRE_EXTRA_STUDY_DATA) != 0)
+ {
+ study = (pcre_study_data *)extra_data->study_data;
+ study->size = swap_uint32(study->size);
+ study->flags = swap_uint32(study->flags);
+ study->minlength = swap_uint32(study->minlength);
+ }
+
+#ifndef COMPILE_PCRE8
+ptr = (pcre_uchar *)re + re->name_table_offset;
+length = re->name_count * re->name_entry_size;
+#if defined SUPPORT_UTF && defined COMPILE_PCRE16
+utf = (re->options & PCRE_UTF16) != 0;
+utf16_char = FALSE;
+#endif /* SUPPORT_UTF && COMPILE_PCRE16 */
+
+while(TRUE)
+ {
+ /* Swap previous characters. */
+ while (length-- > 0)
+ {
+#if defined COMPILE_PCRE16
+ *ptr = swap_uint16(*ptr);
+#elif defined COMPILE_PCRE32
+ *ptr = swap_uint32(*ptr);
+#endif
+ ptr++;
+ }
+#if defined SUPPORT_UTF && defined COMPILE_PCRE16
+ if (utf16_char)
+ {
+ if (HAS_EXTRALEN(ptr[-1]))
+ {
+ /* We know that there is only one extra character in UTF-16. */
+ *ptr = swap_uint16(*ptr);
+ ptr++;
+ }
+ }
+ utf16_char = FALSE;
+#endif /* SUPPORT_UTF */
+
+ /* Get next opcode. */
+ length = 0;
+#if defined COMPILE_PCRE16
+ *ptr = swap_uint16(*ptr);
+#elif defined COMPILE_PCRE32
+ *ptr = swap_uint32(*ptr);
+#endif
+ switch (*ptr)
+ {
+ case OP_END:
+ return 0;
+
+#if defined SUPPORT_UTF && defined COMPILE_PCRE16
+ case OP_CHAR:
+ case OP_CHARI:
+ case OP_NOT:
+ case OP_NOTI:
+ case OP_STAR:
+ case OP_MINSTAR:
+ case OP_PLUS:
+ case OP_MINPLUS:
+ case OP_QUERY:
+ case OP_MINQUERY:
+ case OP_UPTO:
+ case OP_MINUPTO:
+ case OP_EXACT:
+ case OP_POSSTAR:
+ case OP_POSPLUS:
+ case OP_POSQUERY:
+ case OP_POSUPTO:
+ case OP_STARI:
+ case OP_MINSTARI:
+ case OP_PLUSI:
+ case OP_MINPLUSI:
+ case OP_QUERYI:
+ case OP_MINQUERYI:
+ case OP_UPTOI:
+ case OP_MINUPTOI:
+ case OP_EXACTI:
+ case OP_POSSTARI:
+ case OP_POSPLUSI:
+ case OP_POSQUERYI:
+ case OP_POSUPTOI:
+ case OP_NOTSTAR:
+ case OP_NOTMINSTAR:
+ case OP_NOTPLUS:
+ case OP_NOTMINPLUS:
+ case OP_NOTQUERY:
+ case OP_NOTMINQUERY:
+ case OP_NOTUPTO:
+ case OP_NOTMINUPTO:
+ case OP_NOTEXACT:
+ case OP_NOTPOSSTAR:
+ case OP_NOTPOSPLUS:
+ case OP_NOTPOSQUERY:
+ case OP_NOTPOSUPTO:
+ case OP_NOTSTARI:
+ case OP_NOTMINSTARI:
+ case OP_NOTPLUSI:
+ case OP_NOTMINPLUSI:
+ case OP_NOTQUERYI:
+ case OP_NOTMINQUERYI:
+ case OP_NOTUPTOI:
+ case OP_NOTMINUPTOI:
+ case OP_NOTEXACTI:
+ case OP_NOTPOSSTARI:
+ case OP_NOTPOSPLUSI:
+ case OP_NOTPOSQUERYI:
+ case OP_NOTPOSUPTOI:
+ if (utf) utf16_char = TRUE;
+#endif
+ /* Fall through. */
+
+ default:
+ length = PRIV(OP_lengths)[*ptr] - 1;
+ break;
+
+ case OP_CLASS:
+ case OP_NCLASS:
+ /* Skip the character bit map. */
+ ptr += 32/sizeof(pcre_uchar);
+ length = 0;
+ break;
+
+ case OP_XCLASS:
+ /* Reverse the size of the XCLASS instance. */
+ ptr++;
+#if defined COMPILE_PCRE16
+ *ptr = swap_uint16(*ptr);
+#elif defined COMPILE_PCRE32
+ *ptr = swap_uint32(*ptr);
+#endif
+#ifndef COMPILE_PCRE32
+ if (LINK_SIZE > 1)
+ {
+ /* LINK_SIZE can be 1 or 2 in 16 bit mode. */
+ ptr++;
+ *ptr = swap_uint16(*ptr);
+ }
+#endif
+ ptr++;
+ length = (GET(ptr, -LINK_SIZE)) - (1 + LINK_SIZE + 1);
+#if defined COMPILE_PCRE16
+ *ptr = swap_uint16(*ptr);
+#elif defined COMPILE_PCRE32
+ *ptr = swap_uint32(*ptr);
+#endif
+ if ((*ptr & XCL_MAP) != 0)
+ {
+ /* Skip the character bit map. */
+ ptr += 32/sizeof(pcre_uchar);
+ length -= 32/sizeof(pcre_uchar);
+ }
+ break;
+ }
+ ptr++;
+ }
+/* Control should never reach here in 16/32 bit mode. */
+#else /* In 8-bit mode, the pattern does not need to be processed. */
+return 0;
+#endif /* !COMPILE_PCRE8 */
+}
+
+/* End of pcre_byte_order.c */