1 /************************************************* 2 * Perl-Compatible Regular Expressions * 3 *************************************************/ 4 5 /* PCRE is a library of functions to support regular expressions whose syntax 6 and semantics are as close as possible to those of the Perl 5 language. 7 8 Written by Philip Hazel 9 Copyright (c) 1997-2012 University of Cambridge 10 11 ----------------------------------------------------------------------------- 12 Redistribution and use in source and binary forms, with or without 13 modification, are permitted provided that the following conditions are met: 14 15 * Redistributions of source code must retain the above copyright notice, 16 this list of conditions and the following disclaimer. 17 18 * Redistributions in binary form must reproduce the above copyright 19 notice, this list of conditions and the following disclaimer in the 20 documentation and/or other materials provided with the distribution. 21 22 * Neither the name of the University of Cambridge nor the names of its 23 contributors may be used to endorse or promote products derived from 24 this software without specific prior written permission. 25 26 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 27 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 30 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 POSSIBILITY OF SUCH DAMAGE. 37 ----------------------------------------------------------------------------- 38 */ 39 40 41 /* This module contains a function for converting any UTF-16 character 42 strings to host byte order. */ 43 44 45 #ifdef HAVE_CONFIG_H 46 #include "config.h" 47 #endif 48 49 /* Generate code with 16 bit character support. */ 50 #define COMPILE_PCRE16 51 52 #include "pcre_internal.h" 53 54 /************************************************* 55 * Convert any UTF-16 string to host byte order * 56 *************************************************/ 57 58 /* This function takes an UTF-16 string and converts 59 it to host byte order. The length can be explicitly set, 60 or automatically detected for zero terminated strings. 61 BOMs can be kept or discarded during the conversion. 62 Conversion can be done in place (output == input). 63 64 Arguments: 65 output the output buffer, its size must be greater 66 or equal than the input string 67 input any UTF-16 string 68 length the number of 16-bit units in the input string 69 can be less than zero for zero terminated strings 70 host_byte_order 71 A non-zero value means the input is in host byte 72 order, which can be dynamically changed by BOMs later. 73 Initially it contains the starting byte order and returns 74 with the last byte order so it can be used for stream 75 processing. It can be NULL, which set the host byte 76 order mode by default. 77 keep_boms for a non-zero value, the BOM (0xfeff) characters 78 are copied as well 79 80 Returns: the number of 16-bit units placed into the output buffer, 81 including the zero-terminator 82 */ 83 84 int 85 pcre16_utf16_to_host_byte_order(PCRE_UCHAR16 *output, PCRE_SPTR16 input, 86 int length, int *host_byte_order, int keep_boms) 87 { 88 #ifdef SUPPORT_UTF 89 /* This function converts any UTF-16 string to host byte order and optionally 90 removes any Byte Order Marks (BOMS). Returns with the remainig length. */ 91 int host_bo = host_byte_order != NULL ? *host_byte_order : 1; 92 pcre_uchar *optr = (pcre_uchar *)output; 93 const pcre_uchar *iptr = (const pcre_uchar *)input; 94 const pcre_uchar *end; 95 /* The c variable must be unsigned. */ 96 register pcre_uchar c; 97 98 if (length < 0) 99 length = STRLEN_UC(iptr) + 1; 100 end = iptr + length; 101 102 while (iptr < end) 103 { 104 c = *iptr++; 105 if (c == 0xfeff || c == 0xfffe) 106 { 107 /* Detecting the byte order of the machine is unnecessary, it is 108 enough to know that the UTF-16 string has the same byte order or not. */ 109 host_bo = c == 0xfeff; 110 if (keep_boms != 0) 111 *optr++ = 0xfeff; 112 else 113 length--; 114 } 115 else 116 *optr++ = host_bo ? c : ((c >> 8) | (c << 8)); /* Flip bytes if needed. */ 117 } 118 if (host_byte_order != NULL) 119 *host_byte_order = host_bo; 120 121 #else /* Not SUPPORT_UTF */ 122 (void)(output); /* Keep picky compilers happy */ 123 (void)(input); 124 (void)(keep_boms); 125 (void)(host_byte_order); 126 #endif /* SUPPORT_UTF */ 127 return length; 128 } 129 130 /* End of pcre16_utf16_utils.c */ 131
