зеркало из https://github.com/mozilla/pjs.git
727 строки
23 KiB
C++
727 строки
23 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/*
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* The contents of this file are subject to the Netscape Public License
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* Version 1.0 (the "NPL"); you may not use this file except in
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* compliance with the NPL. You may obtain a copy of the NPL at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the NPL is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
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* for the specific language governing rights and limitations under the
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* NPL.
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*
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* The Initial Developer of this code under the NPL is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All Rights
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* Reserved.
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*/
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/******************************************************************************************
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MODULE NOTES:
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This file contains the workhorse copy and shift functions used in nsStrStruct.
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Ultimately, I plan to make the function pointers in this system available for
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use by external modules. They'll be able to install their own "handlers".
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Not so, today though.
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*******************************************************************************************/
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#ifndef _BUFFERROUTINES_H
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#define _BUFFERROUTINES_H
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#include "nsCRT.h"
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#ifndef RICKG_TESTBED
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#include "nsUnicharUtilCIID.h"
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#include "nsIServiceManager.h"
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#include "nsICaseConversion.h"
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#endif
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#define KSHIFTLEFT (0)
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#define KSHIFTRIGHT (1)
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inline PRUnichar GetUnicharAt(const char* aString,PRUint32 anIndex) {
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return ((PRUnichar*)aString)[anIndex];
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}
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inline PRUnichar GetCharAt(const char* aString,PRUint32 anIndex) {
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return (PRUnichar)aString[anIndex];
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}
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//----------------------------------------------------------------------------------------
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//
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// This set of methods is used to shift the contents of a char buffer.
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// The functions are differentiated by shift direction and the underlying charsize.
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//
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/**
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* This method shifts single byte characters left by a given amount from an given offset.
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* @update gess 01/04/99
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* @param aDest is a ptr to a cstring where left-shift is to be performed
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* @param aLength is the known length of aDest
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* @param anOffset is the index into aDest where shifting shall begin
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* @param aCount is the number of chars to be "cut"
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*/
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void ShiftCharsLeft(char* aDest,PRUint32 aLength,PRUint32 anOffset,PRUint32 aCount) {
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//PRUint32 theMax=aLength-anOffset;
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//PRUint32 theLength=(theMax<aCount) ? theMax : aCount;
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char* first= aDest+anOffset+aCount;
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char* last = aDest+aLength;
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char* to = aDest+anOffset;
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//now loop over characters, shifting them left...
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while(first<=last) {
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*to=*first;
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to++;
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first++;
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}
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}
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/**
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* This method shifts single byte characters right by a given amount from an given offset.
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* @update gess 01/04/99
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* @param aDest is a ptr to a cstring where the shift is to be performed
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* @param aLength is the known length of aDest
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* @param anOffset is the index into aDest where shifting shall begin
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* @param aCount is the number of chars to be "inserted"
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*/
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void ShiftCharsRight(char* aDest,PRUint32 aLength,PRUint32 anOffset,PRUint32 aCount) {
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char* last = aDest+aLength;
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char* first= aDest+anOffset-1;
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char* to = aDest+aLength+aCount;
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//Copy rightmost chars, up to offset+theDelta...
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while(first<last) {
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*to=*last;
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to--;
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last--;
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}
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}
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/**
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* This method shifts unicode characters by a given amount from an given offset.
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* @update gess 01/04/99
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* @param aDest is a ptr to a cstring where the shift is to be performed
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* @param aLength is the known length of aDest
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* @param anOffset is the index into aDest where shifting shall begin
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* @param aCount is the number of chars to be "cut"
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*/
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void ShiftDoubleCharsLeft(char* aDest,PRUint32 aLength,PRUint32 anOffset,PRUint32 aCount) {
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//PRUint32 theMax=aLength-anOffset;
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//PRUint32 theLength=(theMax<aCount) ? theMax : aCount;
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PRUnichar* theBuf=(PRUnichar*)aDest;
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PRUnichar* first= theBuf+anOffset+aCount;
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PRUnichar* last = theBuf+aLength;
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PRUnichar* to = theBuf+anOffset;
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//now loop over characters, shifting them left...
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while(first<=last) {
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*to=*first;
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to++;
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first++;
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}
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}
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/**
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* This method shifts unicode characters by a given amount from an given offset.
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* @update gess 01/04/99
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* @param aDest is a ptr to a cstring where the shift is to be performed
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* @param aLength is the known length of aDest
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* @param anOffset is the index into aDest where shifting shall begin
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* @param aCount is the number of chars to be "inserted"
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*/
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void ShiftDoubleCharsRight(char* aDest,PRUint32 aLength,PRUint32 anOffset,PRUint32 aCount) {
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PRUnichar* theBuf=(PRUnichar*)aDest;
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PRUnichar* last = theBuf+aLength;
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PRUnichar* first= theBuf+anOffset-1;
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PRUnichar* to = theBuf+aLength+aCount;
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//Copy rightmost chars, up to offset+theDelta...
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while(first<last) {
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*to=*last;
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to--;
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last--;
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}
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}
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typedef void (*ShiftChars)(char* aDest,PRUint32 aLength,PRUint32 anOffset,PRUint32 aCount);
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ShiftChars gShiftChars[2][2]= {
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{&ShiftCharsLeft,&ShiftCharsRight},
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{&ShiftDoubleCharsLeft,&ShiftDoubleCharsRight}
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};
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//----------------------------------------------------------------------------------------
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//
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// This set of methods is used to copy one buffer onto another.
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// The functions are differentiated by the size of source and dest character sizes.
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// WARNING: Your destination buffer MUST be big enough to hold all the source bytes.
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// We don't validate these ranges here (this should be done in higher level routines).
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//
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/**
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* Going 1 to 1 is easy, since we assume ascii. No conversions are necessary.
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* @update gess 01/04/99
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* @param aDest is the destination buffer
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* @param aDestOffset is the pos to start copy to in the dest buffer
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* @param aSource is the source buffer
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* @param anOffset is the offset to start copying from in the source buffer
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* @param aCount is the (max) number of chars to copy
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*/
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void CopyChars1To1(char* aDest,PRInt32 anDestOffset,const char* aSource,PRUint32 anOffset,PRUint32 aCount) {
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char* to = aDest+anDestOffset;
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const char* first= aSource+anOffset;
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const char* last = first+aCount;
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//now loop over characters, shifting them left...
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while(first<last) {
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*to=*first;
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to++;
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first++;
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}
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}
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/**
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* Going 1 to 2 requires a conversion from ascii to unicode. This can be expensive.
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* @param aDest is the destination buffer
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* @param aDestOffset is the pos to start copy to in the dest buffer
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* @param aSource is the source buffer
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* @param anOffset is the offset to start copying from in the source buffer
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* @param aCount is the (max) number of chars to copy
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*/
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void CopyChars1To2(char* aDest,PRInt32 anDestOffset,const char* aSource,PRUint32 anOffset,PRUint32 aCount) {
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PRUnichar* theDest=(PRUnichar*)aDest;
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PRUnichar* to = theDest+anDestOffset;
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const unsigned char* first= (const unsigned char*)aSource+anOffset;
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const unsigned char* last = first+aCount;
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//now loop over characters, shifting them left...
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while(first<last) {
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*to=(PRUnichar)(*first);
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to++;
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first++;
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}
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}
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/**
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* Going 2 to 1 requires a conversion from unicode down to ascii. This can be lossy.
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* @update gess 01/04/99
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* @param aDest is the destination buffer
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* @param aDestOffset is the pos to start copy to in the dest buffer
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* @param aSource is the source buffer
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* @param anOffset is the offset to start copying from in the source buffer
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* @param aCount is the (max) number of chars to copy
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*/
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void CopyChars2To1(char* aDest,PRInt32 anDestOffset,const char* aSource,PRUint32 anOffset,PRUint32 aCount) {
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char* to = aDest+anDestOffset;
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PRUnichar* theSource=(PRUnichar*)aSource;
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const PRUnichar* first= theSource+anOffset;
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const PRUnichar* last = first+aCount;
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//now loop over characters, shifting them left...
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while(first<last) {
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if(*first<256)
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*to=(char)*first;
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else *to='.';
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to++;
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first++;
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}
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}
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/**
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* Going 2 to 2 is fast and efficient.
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* @update gess 01/04/99
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* @param aDest is the destination buffer
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* @param aDestOffset is the pos to start copy to in the dest buffer
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* @param aSource is the source buffer
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* @param anOffset is the offset to start copying from in the source buffer
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* @param aCount is the (max) number of chars to copy
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*/
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void CopyChars2To2(char* aDest,PRInt32 anDestOffset,const char* aSource,PRUint32 anOffset,PRUint32 aCount) {
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PRUnichar* theDest=(PRUnichar*)aDest;
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PRUnichar* to = theDest+anDestOffset;
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PRUnichar* theSource=(PRUnichar*)aSource;
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PRUnichar* from= theSource+anOffset;
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memcpy((void*)to,(void*)from,aCount*2);
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}
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//--------------------------------------------------------------------------------------
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typedef void (*CopyChars)(char* aDest,PRInt32 anDestOffset,const char* aSource,PRUint32 anOffset,PRUint32 aCount);
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CopyChars gCopyChars[2][2]={
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{&CopyChars1To1,&CopyChars1To2},
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{&CopyChars2To1,&CopyChars2To2}
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};
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//----------------------------------------------------------------------------------------
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//
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// This set of methods is used to search a buffer looking for a char.
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//
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/**
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* This methods cans the given buffer for the given char
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*
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* @update gess 3/25/98
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* @param aDest is the buffer to be searched
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* @param aLength is the size (in char-units, not bytes) of the buffer
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* @param anOffset is the start pos to begin searching
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* @param aChar is the target character we're looking for
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* @param aIgnorecase tells us whether to use a case sensitive search
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* @return index of pos if found, else -1 (kNotFound)
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*/
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inline PRInt32 FindChar1(const char* aDest,PRUint32 aLength,PRUint32 anOffset,const PRUnichar aChar,PRBool aIgnoreCase) {
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PRInt32 theIndex=0;
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PRInt32 theLength=(PRInt32)aLength;
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if(aIgnoreCase) {
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PRUnichar theChar=nsCRT::ToUpper(aChar);
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for(theIndex=(PRInt32)anOffset;theIndex<theLength;theIndex++){
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if(nsCRT::ToUpper(aDest[theIndex])==theChar)
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return theIndex;
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}
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}
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else {
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for(theIndex=(PRInt32)anOffset;theIndex<theLength;theIndex++){
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if(aDest[theIndex]==aChar)
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return theIndex;
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}
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}
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return kNotFound;
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}
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/**
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* This methods cans the given buffer for the given char
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*
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* @update gess 3/25/98
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* @param aDest is the buffer to be searched
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* @param aLength is the size (in char-units, not bytes) of the buffer
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* @param anOffset is the start pos to begin searching
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* @param aChar is the target character we're looking for
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* @param aIgnorecase tells us whether to use a case sensitive search
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* @return index of pos if found, else -1 (kNotFound)
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*/
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inline PRInt32 FindChar2(const char* aDest,PRUint32 aLength,PRUint32 anOffset,const PRUnichar aChar,PRBool aIgnoreCase) {
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PRInt32 theIndex=0;
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PRInt32 theLength=(PRInt32)aLength;
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PRUnichar* theBuf=(PRUnichar*)aDest;
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if(aIgnoreCase) {
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PRUnichar theChar=nsCRT::ToUpper(aChar);
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for(theIndex=(PRInt32)anOffset;theIndex<theLength;theIndex++){
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if(nsCRT::ToUpper(theBuf[theIndex])==theChar)
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return theIndex;
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}
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}
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else {
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for(theIndex=(PRInt32)anOffset;theIndex<theLength;theIndex++){
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if(theBuf[theIndex]==aChar)
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return theIndex;
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}
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}
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return kNotFound;
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}
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/**
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* This methods cans the given buffer (in reverse) for the given char
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*
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* @update gess 3/25/98
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* @param aDest is the buffer to be searched
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* @param aLength is the size (in char-units, not bytes) of the buffer
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* @param anOffset is the start pos to begin searching
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* @param aChar is the target character we're looking for
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* @param aIgnorecase tells us whether to use a case sensitive search
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* @return index of pos if found, else -1 (kNotFound)
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*/
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inline PRInt32 RFindChar1(const char* aDest,PRUint32 aDestLength,PRUint32 anOffset,const PRUnichar aChar,PRBool aIgnoreCase) {
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PRInt32 theIndex=0;
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if(aIgnoreCase) {
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PRUnichar theChar=nsCRT::ToUpper(aChar);
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for(theIndex=(PRInt32)anOffset;theIndex>=0;theIndex--){
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if(nsCRT::ToUpper(aDest[theIndex])==theChar)
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return theIndex;
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}
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}
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else {
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for(theIndex=(PRInt32)anOffset;theIndex>=0;theIndex--){
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if(aDest[theIndex]==aChar)
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return theIndex;
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}
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}
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return kNotFound;
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}
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/**
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* This methods cans the given buffer for the given char
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*
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* @update gess 3/25/98
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* @param aDest is the buffer to be searched
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* @param aLength is the size (in char-units, not bytes) of the buffer
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* @param anOffset is the start pos to begin searching
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* @param aChar is the target character we're looking for
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* @param aIgnorecase tells us whether to use a case sensitive search
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* @return index of pos if found, else -1 (kNotFound)
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*/
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inline PRInt32 RFindChar2(const char* aDest,PRUint32 aDestLength,PRUint32 anOffset,const PRUnichar aChar,PRBool aIgnoreCase) {
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PRInt32 theIndex=0;
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PRUnichar* theBuf=(PRUnichar*)aDest;
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if(aIgnoreCase) {
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PRUnichar theChar=nsCRT::ToUpper(aChar);
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for(theIndex=(PRInt32)anOffset;theIndex>=0;theIndex--){
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if(nsCRT::ToUpper(theBuf[theIndex])==theChar)
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return theIndex;
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}
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}
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else {
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for(theIndex=(PRInt32)anOffset;theIndex>=0;theIndex--){
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if(theBuf[theIndex]==aChar)
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return theIndex;
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}
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}
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return kNotFound;
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}
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typedef PRInt32 (*FindChars)(const char* aDest,PRUint32 aDestLength,PRUint32 anOffset,const PRUnichar aChar,PRBool aIgnoreCase);
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FindChars gFindChars[]={&FindChar1,&FindChar2};
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FindChars gRFindChars[]={&RFindChar1,&RFindChar2};
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//----------------------------------------------------------------------------------------
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//
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// This set of methods is used to compare one buffer onto another.
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// The functions are differentiated by the size of source and dest character sizes.
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// WARNING: Your destination buffer MUST be big enough to hold all the source bytes.
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// We don't validate these ranges here (this should be done in higher level routines).
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//
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/**
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* This method compares the data in one buffer with another
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* @update gess 01/04/99
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* @param aStr1 is the first buffer to be compared
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* @param aStr2 is the 2nd buffer to be compared
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* @param aCount is the number of chars to compare
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* @param aIgnorecase tells us whether to use a case-sensitive comparison
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* @return -1,0,1 depending on <,==,>
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*/
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PRInt32 Compare1To1(const char* aStr1,const char* aStr2,PRUint32 aCount,PRBool aIgnoreCase){
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PRInt32 result=0;
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if(aIgnoreCase)
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result=nsCRT::strncasecmp(aStr1,aStr2,aCount);
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else result=strncmp(aStr1,aStr2,aCount);
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return result;
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}
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/**
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* This method compares the data in one buffer with another
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* @update gess 01/04/99
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* @param aStr1 is the first buffer to be compared
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* @param aStr2 is the 2nd buffer to be compared
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* @param aCount is the number of chars to compare
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* @param aIgnorecase tells us whether to use a case-sensitive comparison
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* @return -1,0,1 depending on <,==,>
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*/
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PRInt32 Compare2To2(const char* aStr1,const char* aStr2,PRUint32 aCount,PRBool aIgnoreCase){
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PRInt32 result=0;
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if(aIgnoreCase)
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result=nsCRT::strncasecmp((PRUnichar*)aStr1,(PRUnichar*)aStr2,aCount);
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else result=nsCRT::strncmp((PRUnichar*)aStr1,(PRUnichar*)aStr2,aCount);
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return result;
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}
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/**
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* This method compares the data in one buffer with another
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* @update gess 01/04/99
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* @param aStr1 is the first buffer to be compared
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* @param aStr2 is the 2nd buffer to be compared
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* @param aCount is the number of chars to compare
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* @param aIgnorecase tells us whether to use a case-sensitive comparison
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* @return -1,0,1 depending on <,==,>
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*/
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PRInt32 Compare2To1(const char* aStr1,const char* aStr2,PRUint32 aCount,PRBool aIgnoreCase){
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PRInt32 result;
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if(aIgnoreCase)
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result=nsCRT::strncasecmp((PRUnichar*)aStr1,aStr2,aCount);
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else result=nsCRT::strncmp((PRUnichar*)aStr1,aStr2,aCount);
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return result;
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}
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/**
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* This method compares the data in one buffer with another
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* @update gess 01/04/99
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* @param aStr1 is the first buffer to be compared
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* @param aStr2 is the 2nd buffer to be compared
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* @param aCount is the number of chars to compare
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* @param aIgnorecase tells us whether to use a case-sensitive comparison
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* @return -1,0,1 depending on <,==,>
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*/
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PRInt32 Compare1To2(const char* aStr1,const char* aStr2,PRUint32 aCount,PRBool aIgnoreCase){
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PRInt32 result;
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|
if(aIgnoreCase)
|
|
result=nsCRT::strncasecmp((PRUnichar*)aStr2,aStr1,aCount)*-1;
|
|
else result=nsCRT::strncmp((PRUnichar*)aStr2,aStr1,aCount)*-1;
|
|
return result;
|
|
}
|
|
|
|
|
|
typedef PRInt32 (*CompareChars)(const char* aStr1,const char* aStr2,PRUint32 aCount,PRBool aIgnoreCase);
|
|
CompareChars gCompare[2][2]={
|
|
{&Compare1To1,&Compare1To2},
|
|
{&Compare2To1,&Compare2To2},
|
|
};
|
|
|
|
//----------------------------------------------------------------------------------------
|
|
//
|
|
// This set of methods is used to convert the case of strings...
|
|
//
|
|
|
|
|
|
/**
|
|
* This method performs a case conversion the data in the given buffer
|
|
*
|
|
* @update gess 01/04/99
|
|
* @param aString is the buffer to be case shifted
|
|
* @param aCount is the number of chars to compare
|
|
* @param aToUpper tells us whether to convert to upper or lower
|
|
* @return 0
|
|
*/
|
|
PRInt32 ConvertCase1(char* aString,PRUint32 aCount,PRBool aToUpper){
|
|
PRInt32 result=0;
|
|
|
|
typedef char chartype;
|
|
chartype* cp = (chartype*)aString;
|
|
chartype* end = cp + aCount-1;
|
|
while (cp <= end) {
|
|
chartype ch = *cp;
|
|
if(aToUpper) {
|
|
if ((ch >= 'a') && (ch <= 'z')) {
|
|
*cp = 'A' + (ch - 'a');
|
|
}
|
|
}
|
|
else {
|
|
if ((ch >= 'A') && (ch <= 'Z')) {
|
|
*cp = 'a' + (ch - 'A');
|
|
}
|
|
}
|
|
cp++;
|
|
}
|
|
return result;
|
|
}
|
|
|
|
//----------------------------------------------------------------------------------------
|
|
|
|
#ifndef RICKG_TESTBED
|
|
class HandleCaseConversionShutdown3 : public nsIShutdownListener {
|
|
public :
|
|
NS_IMETHOD OnShutdown(const nsCID& cid, nsISupports* service);
|
|
HandleCaseConversionShutdown3(void) { NS_INIT_REFCNT(); }
|
|
virtual ~HandleCaseConversionShutdown3(void) {}
|
|
NS_DECL_ISUPPORTS
|
|
};
|
|
|
|
static NS_DEFINE_CID(kUnicharUtilCID, NS_UNICHARUTIL_CID);
|
|
static NS_DEFINE_IID(kICaseConversionIID, NS_ICASECONVERSION_IID);
|
|
static NS_DEFINE_IID(kIShutdownListenerIID, NS_ISHUTDOWNLISTENER_IID);
|
|
static nsICaseConversion * gCaseConv = 0;
|
|
|
|
NS_IMPL_ISUPPORTS(HandleCaseConversionShutdown3, kIShutdownListenerIID);
|
|
|
|
nsresult HandleCaseConversionShutdown3::OnShutdown(const nsCID& cid, nsISupports* service) {
|
|
if (cid.Equals(kUnicharUtilCID)) {
|
|
NS_ASSERTION(service == gCaseConv, "wrong service!");
|
|
if(gCaseConv){
|
|
gCaseConv->Release();
|
|
gCaseConv = 0;
|
|
}
|
|
}
|
|
return NS_OK;
|
|
}
|
|
|
|
|
|
class CCaseConversionServiceInitializer {
|
|
public:
|
|
CCaseConversionServiceInitializer(){
|
|
mListener = new HandleCaseConversionShutdown3();
|
|
if(mListener){
|
|
mListener->AddRef();
|
|
nsServiceManager::GetService(kUnicharUtilCID, kICaseConversionIID,(nsISupports**) &gCaseConv, mListener);
|
|
}
|
|
}
|
|
protected:
|
|
HandleCaseConversionShutdown3* mListener;
|
|
};
|
|
|
|
#endif
|
|
|
|
//----------------------------------------------------------------------------------------
|
|
|
|
/**
|
|
* This method performs a case conversion the data in the given buffer
|
|
*
|
|
* @update gess 01/04/99
|
|
* @param aString is the buffer to be case shifted
|
|
* @param aCount is the number of chars to compare
|
|
* @param aToUpper tells us whether to convert to upper or lower
|
|
* @return 0
|
|
*/
|
|
PRInt32 ConvertCase2(char* aString,PRUint32 aCount,PRBool aToUpper){
|
|
PRUnichar* cp = (PRUnichar*)aString;
|
|
PRUnichar* end = cp + aCount-1;
|
|
PRInt32 result=0;
|
|
|
|
#ifndef RICKG_TESTBED
|
|
static CCaseConversionServiceInitializer gCaseConversionServiceInitializer;
|
|
|
|
// I18N code begin
|
|
if(gCaseConv) {
|
|
nsresult err=(aToUpper) ? gCaseConv->ToUpper(cp, cp, aCount) : gCaseConv->ToLower(cp, cp, aCount);
|
|
if(NS_SUCCEEDED(err))
|
|
return 0;
|
|
}
|
|
// I18N code end
|
|
#endif
|
|
|
|
|
|
while (cp <= end) {
|
|
PRUnichar ch = *cp;
|
|
if(aToUpper) {
|
|
if ((ch >= 'a') && (ch <= 'z')) {
|
|
*cp = 'A' + (ch - 'a');
|
|
}
|
|
}
|
|
else {
|
|
if ((ch >= 'A') && (ch <= 'Z')) {
|
|
*cp = 'a' + (ch - 'A');
|
|
}
|
|
}
|
|
cp++;
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
typedef PRInt32 (*CaseConverters)(char*,PRUint32,PRBool);
|
|
CaseConverters gCaseConverters[]={&ConvertCase1,&ConvertCase2};
|
|
|
|
|
|
|
|
//----------------------------------------------------------------------------------------
|
|
//
|
|
// This set of methods is used compress char sequences in a buffer...
|
|
//
|
|
|
|
|
|
/**
|
|
* This method compresses duplicate runs of a given char from the given buffer
|
|
*
|
|
* @update gess 01/04/99
|
|
* @param aString is the buffer to be manipulated
|
|
* @param aLength is the length of the buffer
|
|
* @param aSet tells us which chars to compress from given buffer
|
|
* @param aEliminateLeading tells us whether to strip chars from the start of the buffer
|
|
* @param aEliminateTrailing tells us whether to strip chars from the start of the buffer
|
|
* @return the new length of the given buffer
|
|
*/
|
|
PRInt32 CompressChars1(char* aString,PRUint32 aLength,const char* aSet){
|
|
|
|
typedef char chartype;
|
|
chartype* from = aString;
|
|
chartype* end = aString + aLength-1;
|
|
chartype* to = from;
|
|
|
|
//this code converts /n, /t, /r into normal space ' ';
|
|
//it also compresses runs of whitespace down to a single char...
|
|
if(aSet){
|
|
PRUint32 aSetLen=strlen(aSet);
|
|
while (from <= end) {
|
|
chartype theChar = *from++;
|
|
if(kNotFound!=FindChar1(aSet,aSetLen,0,theChar,PR_FALSE)){
|
|
*to++=theChar;
|
|
while (from <= end) {
|
|
theChar = *from++;
|
|
if(kNotFound==FindChar1(aSet,aSetLen,0,theChar,PR_FALSE)){
|
|
*to++ = theChar;
|
|
break;
|
|
}
|
|
}
|
|
} else {
|
|
*to++ = theChar;
|
|
}
|
|
}
|
|
*to = 0;
|
|
}
|
|
return to - (chartype*)aString;
|
|
}
|
|
|
|
|
|
/**
|
|
* This method compresses duplicate runs of a given char from the given buffer
|
|
*
|
|
* @update gess 01/04/99
|
|
* @param aString is the buffer to be manipulated
|
|
* @param aLength is the length of the buffer
|
|
* @param aSet tells us which chars to compress from given buffer
|
|
* @param aEliminateLeading tells us whether to strip chars from the start of the buffer
|
|
* @param aEliminateTrailing tells us whether to strip chars from the start of the buffer
|
|
* @return the new length of the given buffer
|
|
*/
|
|
PRInt32 CompressChars2(char* aString,PRUint32 aLength,const char* aSet){
|
|
|
|
typedef PRUnichar chartype;
|
|
chartype* from = (chartype*)aString;
|
|
chartype* end = from + aLength-1;
|
|
chartype* to = from;
|
|
|
|
//this code converts /n, /t, /r into normal space ' ';
|
|
//it also compresses runs of whitespace down to a single char...
|
|
if(aSet){
|
|
PRUint32 aSetLen=strlen(aSet);
|
|
while (from <= end) {
|
|
chartype theChar = *from++;
|
|
if(kNotFound!=FindChar1(aSet,aSetLen,0,theChar,PR_FALSE)){
|
|
*to++=theChar;
|
|
while (from <= end) {
|
|
theChar = *from++;
|
|
if(kNotFound==FindChar1(aSet,aSetLen,0,theChar,PR_FALSE)){
|
|
*to++ = theChar;
|
|
break;
|
|
}
|
|
}
|
|
} else {
|
|
*to++ = theChar;
|
|
}
|
|
}
|
|
*to = 0;
|
|
}
|
|
return to - (chartype*)aString;
|
|
}
|
|
|
|
typedef PRInt32 (*CompressChars)(char* aString,PRUint32 aCount,const char* aSet);
|
|
CompressChars gCompressChars[]={&CompressChars1,&CompressChars2};
|
|
|
|
|
|
#endif
|