mirror of
https://gitlab.winehq.org/wine/wine-gecko.git
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343 lines
9.9 KiB
C++
343 lines
9.9 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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/**
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* MODULE NOTES:
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* @update gess7/30/98
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*
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* Much as I hate to do it, we were using string compares wrong.
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* Often, programmers call functions like strcmp(s1,s2), and pass
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* one or more null strings. Rather than blow up on these, I've
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* added quick checks to ensure that cases like this don't cause
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* us to fail.
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*
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* In general, if you pass a null into any of these string compare
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* routines, we simply return 0.
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*/
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#include "nsCRT.h"
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#include "nsIServiceManager.h"
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#include "nsCharTraits.h"
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#define ADD_TO_HASHVAL(hashval, c) \
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hashval = (hashval>>28) ^ (hashval<<4) ^ (c)
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//----------------------------------------------------------------------
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////////////////////////////////////////////////////////////////////////////////
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// My lovely strtok routine
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#define IS_DELIM(m, c) ((m)[(c) >> 3] & (1 << ((c) & 7)))
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#define SET_DELIM(m, c) ((m)[(c) >> 3] |= (1 << ((c) & 7)))
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#define DELIM_TABLE_SIZE 32
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char* nsCRT::strtok(char* string, const char* delims, char* *newStr)
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{
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NS_ASSERTION(string, "Unlike regular strtok, the first argument cannot be null.");
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char delimTable[DELIM_TABLE_SIZE];
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PRUint32 i;
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char* result;
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char* str = string;
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for (i = 0; i < DELIM_TABLE_SIZE; i++)
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delimTable[i] = '\0';
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for (i = 0; delims[i]; i++) {
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SET_DELIM(delimTable, NS_STATIC_CAST(PRUint8, delims[i]));
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}
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NS_ASSERTION(delims[i] == '\0', "too many delimiters");
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// skip to beginning
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while (*str && IS_DELIM(delimTable, NS_STATIC_CAST(PRUint8, *str))) {
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str++;
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}
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result = str;
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// fix up the end of the token
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while (*str) {
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if (IS_DELIM(delimTable, NS_STATIC_CAST(PRUint8, *str))) {
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*str++ = '\0';
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break;
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}
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str++;
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}
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*newStr = str;
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return str == result ? NULL : result;
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}
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////////////////////////////////////////////////////////////////////////////////
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/**
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* Compare unichar string ptrs, stopping at the 1st null
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* NOTE: If both are null, we return 0.
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* NOTE: We terminate the search upon encountering a NULL
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*
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* @update gess 11/10/99
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* @param s1 and s2 both point to unichar strings
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* @return 0 if they match, -1 if s1<s2; 1 if s1>s2
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*/
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PRInt32 nsCRT::strcmp(const PRUnichar* s1, const PRUnichar* s2) {
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if(s1 && s2) {
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for (;;) {
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PRUnichar c1 = *s1++;
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PRUnichar c2 = *s2++;
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if (c1 != c2) {
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if (c1 < c2) return -1;
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return 1;
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}
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if ((0==c1) || (0==c2)) break;
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}
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}
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else {
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if (s1) // s2 must have been null
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return -1;
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if (s2) // s1 must have been null
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return 1;
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}
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return 0;
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}
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/**
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* Compare unichar string ptrs, stopping at the 1st null or nth char.
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* NOTE: If either is null, we return 0.
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* NOTE: We DO NOT terminate the search upon encountering NULL's before N
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*
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* @update gess 11/10/99
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* @param s1 and s2 both point to unichar strings
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* @return 0 if they match, -1 if s1<s2; 1 if s1>s2
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*/
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PRInt32 nsCRT::strncmp(const PRUnichar* s1, const PRUnichar* s2, PRUint32 n) {
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if(s1 && s2) {
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if(n != 0) {
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do {
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PRUnichar c1 = *s1++;
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PRUnichar c2 = *s2++;
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if (c1 != c2) {
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if (c1 < c2) return -1;
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return 1;
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}
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} while (--n != 0);
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}
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}
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return 0;
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}
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PRUnichar* nsCRT::strdup(const PRUnichar* str)
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{
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PRUint32 len = nsCRT::strlen(str);
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return strndup(str, len);
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}
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PRUnichar* nsCRT::strndup(const PRUnichar* str, PRUint32 len)
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{
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nsCppSharedAllocator<PRUnichar> shared_allocator;
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PRUnichar* rslt = shared_allocator.allocate(len + 1); // add one for the null
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// PRUnichar* rslt = new PRUnichar[len + 1];
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if (rslt == NULL) return NULL;
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memcpy(rslt, str, len * sizeof(PRUnichar));
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rslt[len] = 0;
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return rslt;
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}
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/**
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* |nsCRT::HashCode| is identical to |PL_HashString|, which tests
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* (http://bugzilla.mozilla.org/showattachment.cgi?attach_id=26596)
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* show to be the best hash among several other choices.
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*
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* We re-implement it here rather than calling it for two reasons:
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* (1) in this interface, we also calculate the length of the
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* string being hashed; and (2) the narrow and wide and `buffer' versions here
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* will hash equivalent strings to the same value, e.g., "Hello" and L"Hello".
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*/
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PRUint32 nsCRT::HashCode(const char* str, PRUint32* resultingStrLen)
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{
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PRUint32 h = 0;
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const char* s = str;
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if (!str) return h;
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unsigned char c;
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while ( (c = *s++) )
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ADD_TO_HASHVAL(h, c);
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if ( resultingStrLen )
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*resultingStrLen = (s-str)-1;
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return h;
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}
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PRUint32 nsCRT::HashCode(const PRUnichar* str, PRUint32* resultingStrLen)
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{
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PRUint32 h = 0;
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const PRUnichar* s = str;
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if (!str) return h;
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PRUnichar c;
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while ( (c = *s++) )
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ADD_TO_HASHVAL(h, c);
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if ( resultingStrLen )
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*resultingStrLen = (s-str)-1;
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return h;
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}
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PRUint32 nsCRT::HashCodeAsUTF8(const PRUnichar* str, PRUint32* resultingStrLen)
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{
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PRUint32 h = 0;
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const PRUnichar* s = str;
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{
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PRUint16 W1 = 0; // the first UTF-16 word in a two word tuple
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PRUint32 U = 0; // the current char as UCS-4
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int code_length = 0; // the number of bytes in the UTF-8 sequence for the current char
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PRUint16 W;
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while ( (W = *s++) )
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{
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/*
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* On the fly, decoding from UTF-16 (and/or UCS-2) into UTF-8 as per
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* http://www.ietf.org/rfc/rfc2781.txt
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* http://www.ietf.org/rfc/rfc3629.txt
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*/
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if ( !W1 )
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{
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if ( !IS_SURROGATE(W) )
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{
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U = W;
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if ( W <= 0x007F )
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code_length = 1;
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else if ( W <= 0x07FF )
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code_length = 2;
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else
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code_length = 3;
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}
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else if ( NS_IS_HIGH_SURROGATE(W) )
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W1 = W;
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#ifdef DEBUG
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else NS_ERROR("Got low surrogate but no previous high surrogate");
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#endif
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}
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else
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{
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// as required by the standard, this code is careful to
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// throw out illegal sequences
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if ( NS_IS_LOW_SURROGATE(W) )
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{
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U = SURROGATE_TO_UCS4(W1, W);
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NS_ASSERTION(IS_VALID_CHAR(U), "How did this happen?");
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code_length = 4;
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}
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#ifdef DEBUG
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else NS_ERROR("High surrogate not followed by low surrogate");
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#endif
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W1 = 0;
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}
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if ( code_length > 0 )
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{
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static const PRUint16 sBytePrefix[5] = { 0x0000, 0x0000, 0x00C0, 0x00E0, 0x00F0 };
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static const PRUint16 sShift[5] = { 0, 0, 6, 12, 18 };
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/*
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* Unlike the algorithm in http://www.ietf.org/rfc/rfc3629.txt
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* we must calculate the bytes in left to right order so that
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* our hash result matches what the narrow version would calculate
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* on an already UTF-8 string.
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*/
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// hash the first (and often, only, byte)
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ADD_TO_HASHVAL(h, (sBytePrefix[code_length] |
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(U>>sShift[code_length])));
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// an unrolled loop for hashing any remaining bytes in this sequence
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switch ( code_length )
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{ // falling through in each case
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case 4: ADD_TO_HASHVAL(h, (0x80 | ((U>>12) & 0x003F)));
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case 3: ADD_TO_HASHVAL(h, (0x80 | ((U>>6 ) & 0x003F)));
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case 2: ADD_TO_HASHVAL(h, (0x80 | ( U & 0x003F)));
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default: code_length = 0;
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break;
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}
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}
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}
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}
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if ( resultingStrLen )
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*resultingStrLen = (s-str)-1;
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return h;
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}
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PRUint32 nsCRT::BufferHashCode(const PRUnichar* s, PRUint32 len)
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{
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PRUint32 h = 0;
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const PRUnichar* done = s + len;
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while ( s < done )
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h = (h>>28) ^ (h<<4) ^ PRUint16(*s++); // cast to unsigned to prevent possible sign extension
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return h;
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}
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// This should use NSPR but NSPR isn't exporting its PR_strtoll function
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// Until then...
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PRInt64 nsCRT::atoll(const char *str)
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{
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if (!str)
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return LL_Zero();
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PRInt64 ll = LL_Zero(), digitll = LL_Zero();
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while (*str && *str >= '0' && *str <= '9') {
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LL_MUL(ll, ll, 10);
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LL_UI2L(digitll, (*str - '0'));
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LL_ADD(ll, ll, digitll);
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str++;
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}
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return ll;
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}
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