319 lines
8.9 KiB
C
319 lines
8.9 KiB
C
/*************************************************
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* Perl-Compatible Regular Expressions *
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*************************************************/
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/* PCRE is a library of functions to support regular expressions whose syntax
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and semantics are as close as possible to those of the Perl 5 language.
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Written by Philip Hazel
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Copyright (c) 1997-2012 University of Cambridge
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-----------------------------------------------------------------------------
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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* Neither the name of the University of Cambridge nor the names of its
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contributors may be used to endorse or promote products derived from
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this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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-----------------------------------------------------------------------------
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*/
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/* This module contains an internal function that tests a compiled pattern to
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see if it was compiled with the opposite endianness. If so, it uses an
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auxiliary local function to flip the appropriate bytes. */
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "pcre_internal.h"
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/*************************************************
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* Swap byte functions *
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*************************************************/
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/* The following functions swap the bytes of a pcre_uint16
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and pcre_uint32 value.
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Arguments:
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value any number
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Returns: the byte swapped value
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*/
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static pcre_uint32
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swap_uint32(pcre_uint32 value)
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{
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return ((value & 0x000000ff) << 24) |
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((value & 0x0000ff00) << 8) |
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((value & 0x00ff0000) >> 8) |
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(value >> 24);
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}
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static pcre_uint16
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swap_uint16(pcre_uint16 value)
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{
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return (value >> 8) | (value << 8);
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}
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/*************************************************
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* Test for a byte-flipped compiled regex *
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*************************************************/
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/* This function swaps the bytes of a compiled pattern usually
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loaded form the disk. It also sets the tables pointer, which
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is likely an invalid pointer after reload.
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Arguments:
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argument_re points to the compiled expression
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extra_data points to extra data or is NULL
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tables points to the character tables or NULL
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Returns: 0 if the swap is successful, negative on error
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*/
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#if defined COMPILE_PCRE8
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PCRE_EXP_DECL int pcre_pattern_to_host_byte_order(pcre *argument_re,
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pcre_extra *extra_data, const unsigned char *tables)
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#elif defined COMPILE_PCRE16
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PCRE_EXP_DECL int pcre16_pattern_to_host_byte_order(pcre16 *argument_re,
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pcre16_extra *extra_data, const unsigned char *tables)
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#elif defined COMPILE_PCRE32
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PCRE_EXP_DECL int pcre32_pattern_to_host_byte_order(pcre32 *argument_re,
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pcre32_extra *extra_data, const unsigned char *tables)
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#endif
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{
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REAL_PCRE *re = (REAL_PCRE *)argument_re;
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pcre_study_data *study;
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#ifndef COMPILE_PCRE8
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pcre_uchar *ptr;
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int length;
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#if defined SUPPORT_UTF && defined COMPILE_PCRE16
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BOOL utf;
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BOOL utf16_char;
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#endif /* SUPPORT_UTF && COMPILE_PCRE16 */
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#endif /* !COMPILE_PCRE8 */
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if (re == NULL) return PCRE_ERROR_NULL;
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if (re->magic_number == MAGIC_NUMBER)
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{
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if ((re->flags & PCRE_MODE) == 0) return PCRE_ERROR_BADMODE;
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re->tables = tables;
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return 0;
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}
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if (re->magic_number != REVERSED_MAGIC_NUMBER) return PCRE_ERROR_BADMAGIC;
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if ((swap_uint16(re->flags) & PCRE_MODE) == 0) return PCRE_ERROR_BADMODE;
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re->magic_number = MAGIC_NUMBER;
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re->size = swap_uint32(re->size);
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re->options = swap_uint32(re->options);
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re->flags = swap_uint16(re->flags);
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re->top_bracket = swap_uint16(re->top_bracket);
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re->top_backref = swap_uint16(re->top_backref);
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#if defined COMPILE_PCRE8 || defined COMPILE_PCRE16
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re->first_char = swap_uint16(re->first_char);
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re->req_char = swap_uint16(re->req_char);
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#elif defined COMPILE_PCRE32
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re->first_char = swap_uint32(re->first_char);
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re->req_char = swap_uint32(re->req_char);
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#endif
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re->name_table_offset = swap_uint16(re->name_table_offset);
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re->name_entry_size = swap_uint16(re->name_entry_size);
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re->name_count = swap_uint16(re->name_count);
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re->ref_count = swap_uint16(re->ref_count);
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re->tables = tables;
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#ifdef COMPILE_PCRE32
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re->dummy1 = swap_uint16(re->dummy1);
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re->dummy2 = swap_uint16(re->dummy2);
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#endif
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if (extra_data != NULL && (extra_data->flags & PCRE_EXTRA_STUDY_DATA) != 0)
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{
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study = (pcre_study_data *)extra_data->study_data;
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study->size = swap_uint32(study->size);
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study->flags = swap_uint32(study->flags);
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study->minlength = swap_uint32(study->minlength);
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}
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#ifndef COMPILE_PCRE8
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ptr = (pcre_uchar *)re + re->name_table_offset;
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length = re->name_count * re->name_entry_size;
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#if defined SUPPORT_UTF && defined COMPILE_PCRE16
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utf = (re->options & PCRE_UTF16) != 0;
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utf16_char = FALSE;
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#endif /* SUPPORT_UTF && COMPILE_PCRE16 */
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while(TRUE)
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{
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/* Swap previous characters. */
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while (length-- > 0)
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{
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#if defined COMPILE_PCRE16
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*ptr = swap_uint16(*ptr);
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#elif defined COMPILE_PCRE32
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*ptr = swap_uint32(*ptr);
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#endif
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ptr++;
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}
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#if defined SUPPORT_UTF && defined COMPILE_PCRE16
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if (utf16_char)
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{
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if (HAS_EXTRALEN(ptr[-1]))
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{
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/* We know that there is only one extra character in UTF-16. */
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*ptr = swap_uint16(*ptr);
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ptr++;
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}
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}
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utf16_char = FALSE;
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#endif /* SUPPORT_UTF */
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/* Get next opcode. */
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length = 0;
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#if defined COMPILE_PCRE16
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*ptr = swap_uint16(*ptr);
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#elif defined COMPILE_PCRE32
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*ptr = swap_uint32(*ptr);
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#endif
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switch (*ptr)
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{
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case OP_END:
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return 0;
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#if defined SUPPORT_UTF && defined COMPILE_PCRE16
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case OP_CHAR:
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case OP_CHARI:
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case OP_NOT:
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case OP_NOTI:
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case OP_STAR:
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case OP_MINSTAR:
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case OP_PLUS:
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case OP_MINPLUS:
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case OP_QUERY:
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case OP_MINQUERY:
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case OP_UPTO:
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case OP_MINUPTO:
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case OP_EXACT:
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case OP_POSSTAR:
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case OP_POSPLUS:
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case OP_POSQUERY:
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case OP_POSUPTO:
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case OP_STARI:
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case OP_MINSTARI:
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case OP_PLUSI:
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case OP_MINPLUSI:
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case OP_QUERYI:
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case OP_MINQUERYI:
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case OP_UPTOI:
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case OP_MINUPTOI:
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case OP_EXACTI:
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case OP_POSSTARI:
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case OP_POSPLUSI:
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case OP_POSQUERYI:
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case OP_POSUPTOI:
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case OP_NOTSTAR:
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case OP_NOTMINSTAR:
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case OP_NOTPLUS:
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case OP_NOTMINPLUS:
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case OP_NOTQUERY:
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case OP_NOTMINQUERY:
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case OP_NOTUPTO:
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case OP_NOTMINUPTO:
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case OP_NOTEXACT:
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case OP_NOTPOSSTAR:
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case OP_NOTPOSPLUS:
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case OP_NOTPOSQUERY:
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case OP_NOTPOSUPTO:
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case OP_NOTSTARI:
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case OP_NOTMINSTARI:
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case OP_NOTPLUSI:
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case OP_NOTMINPLUSI:
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case OP_NOTQUERYI:
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case OP_NOTMINQUERYI:
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case OP_NOTUPTOI:
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case OP_NOTMINUPTOI:
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case OP_NOTEXACTI:
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case OP_NOTPOSSTARI:
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case OP_NOTPOSPLUSI:
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case OP_NOTPOSQUERYI:
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case OP_NOTPOSUPTOI:
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if (utf) utf16_char = TRUE;
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#endif
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/* Fall through. */
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default:
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length = PRIV(OP_lengths)[*ptr] - 1;
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break;
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case OP_CLASS:
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case OP_NCLASS:
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/* Skip the character bit map. */
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ptr += 32/sizeof(pcre_uchar);
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length = 0;
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break;
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case OP_XCLASS:
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/* Reverse the size of the XCLASS instance. */
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ptr++;
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#if defined COMPILE_PCRE16
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*ptr = swap_uint16(*ptr);
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#elif defined COMPILE_PCRE32
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*ptr = swap_uint32(*ptr);
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#endif
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#ifndef COMPILE_PCRE32
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if (LINK_SIZE > 1)
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{
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/* LINK_SIZE can be 1 or 2 in 16 bit mode. */
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ptr++;
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*ptr = swap_uint16(*ptr);
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}
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#endif
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ptr++;
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length = (GET(ptr, -LINK_SIZE)) - (1 + LINK_SIZE + 1);
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#if defined COMPILE_PCRE16
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*ptr = swap_uint16(*ptr);
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#elif defined COMPILE_PCRE32
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*ptr = swap_uint32(*ptr);
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#endif
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if ((*ptr & XCL_MAP) != 0)
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{
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/* Skip the character bit map. */
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ptr += 32/sizeof(pcre_uchar);
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length -= 32/sizeof(pcre_uchar);
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}
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break;
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}
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ptr++;
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}
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/* Control should never reach here in 16/32 bit mode. */
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#endif /* !COMPILE_PCRE8 */
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return 0;
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}
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/* End of pcre_byte_order.c */
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