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gecko-dev/xpcom/ds/bufferRoutines.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/*
* The contents of this file are subject to the Netscape Public License
* Version 1.0 (the "NPL"); you may not use this file except in
* compliance with the NPL. You may obtain a copy of the NPL at
* http://www.mozilla.org/NPL/
*
* Software distributed under the NPL is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
* for the specific language governing rights and limitations under the
* NPL.
*
* The Initial Developer of this code under the NPL is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All Rights
* Reserved.
*/
/******************************************************************************************
MODULE NOTES:
This file contains the workhorse copy and shift functions used in nsStrStruct.
Ultimately, I plan to make the function pointers in this system available for
use by external modules. They'll be able to install their own "handlers".
Not so, today though.
*******************************************************************************************/
#ifndef _BUFFERROUTINES_H
#define _BUFFERROUTINES_H
#include "nsCRT.h"
#ifndef RICKG_TESTBED
#include "nsUnicharUtilCIID.h"
#include "nsIServiceManager.h"
#include "nsICaseConversion.h"
#endif
#define KSHIFTLEFT (0)
#define KSHIFTRIGHT (1)
inline PRUnichar GetUnicharAt(const char* aString,PRUint32 anIndex) {
return ((PRUnichar*)aString)[anIndex];
}
inline PRUnichar GetCharAt(const char* aString,PRUint32 anIndex) {
return (PRUnichar)aString[anIndex];
}
//----------------------------------------------------------------------------------------
//
// This set of methods is used to shift the contents of a char buffer.
// The functions are differentiated by shift direction and the underlying charsize.
//
/**
* This method shifts single byte characters left by a given amount from an given offset.
* @update gess 01/04/99
* @param aDest is a ptr to a cstring where left-shift is to be performed
* @param aLength is the known length of aDest
* @param anOffset is the index into aDest where shifting shall begin
* @param aCount is the number of chars to be "cut"
*/
void ShiftCharsLeft(char* aDest,PRUint32 aLength,PRUint32 anOffset,PRUint32 aCount) {
PRUint32 theMax=aLength-anOffset;
PRUint32 theLength=(theMax<aCount) ? theMax : aCount;
char* first= aDest+anOffset+aCount;
char* last = aDest+aLength;
char* to = aDest+anOffset;
//now loop over characters, shifting them left...
while(first<=last) {
*to=*first;
to++;
first++;
}
}
/**
* This method shifts single byte characters right by a given amount from an given offset.
* @update gess 01/04/99
* @param aDest is a ptr to a cstring where the shift is to be performed
* @param aLength is the known length of aDest
* @param anOffset is the index into aDest where shifting shall begin
* @param aCount is the number of chars to be "inserted"
*/
void ShiftCharsRight(char* aDest,PRUint32 aLength,PRUint32 anOffset,PRUint32 aCount) {
char* last = aDest+aLength;
char* first= aDest+anOffset-1;
char* to = aDest+aLength+aCount;
//Copy rightmost chars, up to offset+theDelta...
while(first<=last) {
*to=*last;
to--;
last--;
}
}
/**
* This method shifts unicode characters by a given amount from an given offset.
* @update gess 01/04/99
* @param aDest is a ptr to a cstring where the shift is to be performed
* @param aLength is the known length of aDest
* @param anOffset is the index into aDest where shifting shall begin
* @param aCount is the number of chars to be "cut"
*/
void ShiftDoubleCharsLeft(char* aDest,PRUint32 aLength,PRUint32 anOffset,PRUint32 aCount) {
PRUint32 theMax=aLength-anOffset;
PRUint32 theLength=(theMax<aCount) ? theMax : aCount;
PRUnichar* theBuf=(PRUnichar*)aDest;
PRUnichar* first= theBuf+anOffset+aCount;
PRUnichar* last = theBuf+aLength;
PRUnichar* to = theBuf+anOffset;
//now loop over characters, shifting them left...
while(first<=last) {
*to=*first;
to++;
first++;
}
}
/**
* This method shifts unicode characters by a given amount from an given offset.
* @update gess 01/04/99
* @param aDest is a ptr to a cstring where the shift is to be performed
* @param aLength is the known length of aDest
* @param anOffset is the index into aDest where shifting shall begin
* @param aCount is the number of chars to be "inserted"
*/
void ShiftDoubleCharsRight(char* aDest,PRUint32 aLength,PRUint32 anOffset,PRUint32 aCount) {
PRUnichar* theBuf=(PRUnichar*)aDest;
PRUnichar* last = theBuf+aLength;
PRUnichar* first= theBuf+anOffset-1;
PRUnichar* to = theBuf+aLength+aCount;
//Copy rightmost chars, up to offset+theDelta...
while(first<=last) {
*to=*last;
to--;
last--;
}
}
typedef void (*ShiftChars)(char* aDest,PRUint32 aLength,PRUint32 anOffset,PRUint32 aCount);
ShiftChars gShiftChars[2][2]= {
{&ShiftCharsLeft,&ShiftCharsRight},
{&ShiftDoubleCharsLeft,&ShiftDoubleCharsRight}
};
//----------------------------------------------------------------------------------------
//
// This set of methods is used to copy one buffer onto another.
// The functions are differentiated by the size of source and dest character sizes.
// WARNING: Your destination buffer MUST be big enough to hold all the source bytes.
// We don't validate these ranges here (this should be done in higher level routines).
//
/**
* Going 1 to 1 is easy, since we assume ascii. No conversions are necessary.
* @update gess 01/04/99
* @param aDest is the destination buffer
* @param aDestOffset is the pos to start copy to in the dest buffer
* @param aSource is the source buffer
* @param anOffset is the offset to start copying from in the source buffer
* @param aCount is the (max) number of chars to copy
*/
void CopyChars1To1(char* aDest,PRInt32 anDestOffset,const char* aSource,PRUint32 anOffset,PRUint32 aCount) {
char* to = aDest+anDestOffset;
const char* first= aSource+anOffset;
const char* last = first+aCount;
//now loop over characters, shifting them left...
while(first<last) {
*to=*first;
to++;
first++;
}
}
/**
* Going 1 to 2 requires a conversion from ascii to unicode. This can be expensive.
* @param aDest is the destination buffer
* @param aDestOffset is the pos to start copy to in the dest buffer
* @param aSource is the source buffer
* @param anOffset is the offset to start copying from in the source buffer
* @param aCount is the (max) number of chars to copy
*/
void CopyChars1To2(char* aDest,PRInt32 anDestOffset,const char* aSource,PRUint32 anOffset,PRUint32 aCount) {
PRUnichar* theDest=(PRUnichar*)aDest;
PRUnichar* to = theDest+anDestOffset;
const unsigned char* first= (const unsigned char*)aSource+anOffset;
const unsigned char* last = first+aCount;
//now loop over characters, shifting them left...
while(first<last) {
*to=(PRUnichar)(*first);
to++;
first++;
}
}
/**
* Going 2 to 1 requires a conversion from unicode down to ascii. This can be lossy.
* @update gess 01/04/99
* @param aDest is the destination buffer
* @param aDestOffset is the pos to start copy to in the dest buffer
* @param aSource is the source buffer
* @param anOffset is the offset to start copying from in the source buffer
* @param aCount is the (max) number of chars to copy
*/
void CopyChars2To1(char* aDest,PRInt32 anDestOffset,const char* aSource,PRUint32 anOffset,PRUint32 aCount) {
char* to = aDest+anDestOffset;
PRUnichar* theSource=(PRUnichar*)aSource;
const PRUnichar* first= theSource+anOffset;
const PRUnichar* last = first+aCount;
//now loop over characters, shifting them left...
while(first<last) {
if(*first<256)
*to=(char)*first;
else *to='.';
to++;
first++;
}
}
/**
* Going 2 to 2 is fast and efficient.
* @update gess 01/04/99
* @param aDest is the destination buffer
* @param aDestOffset is the pos to start copy to in the dest buffer
* @param aSource is the source buffer
* @param anOffset is the offset to start copying from in the source buffer
* @param aCount is the (max) number of chars to copy
*/
void CopyChars2To2(char* aDest,PRInt32 anDestOffset,const char* aSource,PRUint32 anOffset,PRUint32 aCount) {
PRUnichar* theDest=(PRUnichar*)aDest;
PRUnichar* to = theDest+anDestOffset;
PRUnichar* theSource=(PRUnichar*)aSource;
PRUnichar* from= theSource+anOffset;
memcpy((void*)to,(void*)from,aCount*2);
}
//--------------------------------------------------------------------------------------
typedef void (*CopyChars)(char* aDest,PRInt32 anDestOffset,const char* aSource,PRUint32 anOffset,PRUint32 aCount);
CopyChars gCopyChars[2][2]={
{&CopyChars1To1,&CopyChars1To2},
{&CopyChars2To1,&CopyChars2To2}
};
//----------------------------------------------------------------------------------------
//
// This set of methods is used to search a buffer looking for a char.
//
/**
* This methods cans the given buffer for the given char
*
* @update gess 3/25/98
* @param aDest is the buffer to be searched
* @param aLength is the size (in char-units, not bytes) of the buffer
* @param anOffset is the start pos to begin searching
* @param aChar is the target character we're looking for
* @param aIgnorecase tells us whether to use a case sensitive search
* @return index of pos if found, else -1 (kNotFound)
*/
inline PRInt32 FindChar1(const char* aDest,PRUint32 aLength,PRUint32 anOffset,const PRUnichar aChar,PRBool aIgnoreCase) {
PRUnichar theCmpChar=(aIgnoreCase ? nsCRT::ToUpper(aChar) : aChar);
PRInt32 theIndex=0;
PRInt32 theLength=(PRInt32)aLength;
for(theIndex=(PRInt32)anOffset;theIndex<theLength;theIndex++){
PRUnichar theChar=GetCharAt(aDest,theIndex);
if(aIgnoreCase)
theChar=nsCRT::ToUpper(theChar);
if(theChar==theCmpChar)
return theIndex;
}
return kNotFound;
}
/**
* This methods cans the given buffer for the given char
*
* @update gess 3/25/98
* @param aDest is the buffer to be searched
* @param aLength is the size (in char-units, not bytes) of the buffer
* @param anOffset is the start pos to begin searching
* @param aChar is the target character we're looking for
* @param aIgnorecase tells us whether to use a case sensitive search
* @return index of pos if found, else -1 (kNotFound)
*/
inline PRInt32 FindChar2(const char* aDest,PRUint32 aLength,PRUint32 anOffset,const PRUnichar aChar,PRBool aIgnoreCase) {
PRUnichar theCmpChar=(aIgnoreCase ? nsCRT::ToUpper(aChar) : aChar);
PRInt32 theIndex=0;
PRInt32 theLength=(PRInt32)aLength;
for(theIndex=(PRInt32)anOffset;theIndex<theLength;theIndex++){
PRUnichar theChar=GetUnicharAt(aDest,theIndex);
if(aIgnoreCase)
theChar=nsCRT::ToUpper(theChar);
if(theChar==theCmpChar)
return theIndex;
}
return kNotFound;
}
/**
* This methods cans the given buffer (in reverse) for the given char
*
* @update gess 3/25/98
* @param aDest is the buffer to be searched
* @param aLength is the size (in char-units, not bytes) of the buffer
* @param anOffset is the start pos to begin searching
* @param aChar is the target character we're looking for
* @param aIgnorecase tells us whether to use a case sensitive search
* @return index of pos if found, else -1 (kNotFound)
*/
inline PRInt32 RFindChar1(const char* aDest,PRUint32 aLength,PRUint32 anOffset,const PRUnichar aChar,PRBool aIgnoreCase) {
PRUnichar theCmpChar=(aIgnoreCase ? nsCRT::ToUpper(aChar) : aChar);
PRInt32 theIndex=0;
PRInt32 thePos=(PRInt32)aLength-anOffset-1;
for(theIndex=thePos;theIndex>=0;theIndex--){
PRUnichar theChar=GetCharAt(aDest,theIndex);
if(aIgnoreCase)
theChar=nsCRT::ToUpper(theChar);
if(theChar==theCmpChar)
return theIndex;
}
return kNotFound;
}
/**
* This methods cans the given buffer for the given char
*
* @update gess 3/25/98
* @param aDest is the buffer to be searched
* @param aLength is the size (in char-units, not bytes) of the buffer
* @param anOffset is the start pos to begin searching
* @param aChar is the target character we're looking for
* @param aIgnorecase tells us whether to use a case sensitive search
* @return index of pos if found, else -1 (kNotFound)
*/
inline PRInt32 RFindChar2(const char* aDest,PRUint32 aLength,PRUint32 anOffset,const PRUnichar aChar,PRBool aIgnoreCase) {
PRUnichar theCmpChar=(aIgnoreCase ? nsCRT::ToUpper(aChar) : aChar);
PRInt32 theIndex=0;
PRInt32 thePos=(PRInt32)aLength-anOffset-1;
for(theIndex=thePos;theIndex>=0;theIndex--){
PRUnichar theChar=GetUnicharAt(aDest,theIndex);
if(aIgnoreCase)
theChar=nsCRT::ToUpper(theChar);
if(theChar==theCmpChar)
return theIndex;
}
return kNotFound;
}
typedef PRInt32 (*FindChars)(const char* aDest,PRUint32 aLength,PRUint32 anOffset,const PRUnichar aChar,PRBool aIgnoreCase);
FindChars gFindChars[]={&FindChar1,&FindChar2};
FindChars gRFindChars[]={&RFindChar1,&RFindChar2};
//----------------------------------------------------------------------------------------
//
// This set of methods is used to compare one buffer onto another.
// The functions are differentiated by the size of source and dest character sizes.
// WARNING: Your destination buffer MUST be big enough to hold all the source bytes.
// We don't validate these ranges here (this should be done in higher level routines).
//
/**
* This method compares the data in one buffer with another
* @update gess 01/04/99
* @param aStr1 is the first buffer to be compared
* @param aStr2 is the 2nd buffer to be compared
* @param aCount is the number of chars to compare
* @param aIgnorecase tells us whether to use a case-sensitive comparison
* @return -1,0,1 depending on <,==,>
*/
PRInt32 Compare1To1(const char* aStr1,const char* aStr2,PRUint32 aCount,PRBool aIgnoreCase){
PRInt32 result=0;
if(aIgnoreCase)
result=nsCRT::strncasecmp(aStr1,aStr2,aCount);
else result=strncmp(aStr1,aStr2,aCount);
return result;
}
/**
* This method compares the data in one buffer with another
* @update gess 01/04/99
* @param aStr1 is the first buffer to be compared
* @param aStr2 is the 2nd buffer to be compared
* @param aCount is the number of chars to compare
* @param aIgnorecase tells us whether to use a case-sensitive comparison
* @return -1,0,1 depending on <,==,>
*/
PRInt32 Compare2To2(const char* aStr1,const char* aStr2,PRUint32 aCount,PRBool aIgnoreCase){
PRInt32 result=0;
if(aIgnoreCase)
result=nsCRT::strncasecmp((PRUnichar*)aStr1,(PRUnichar*)aStr2,aCount);
else result=nsCRT::strncmp((PRUnichar*)aStr1,(PRUnichar*)aStr2,aCount);
return result;
}
/**
* This method compares the data in one buffer with another
* @update gess 01/04/99
* @param aStr1 is the first buffer to be compared
* @param aStr2 is the 2nd buffer to be compared
* @param aCount is the number of chars to compare
* @param aIgnorecase tells us whether to use a case-sensitive comparison
* @return -1,0,1 depending on <,==,>
*/
PRInt32 Compare2To1(const char* aStr1,const char* aStr2,PRUint32 aCount,PRBool aIgnoreCase){
PRInt32 result;
if(aIgnoreCase)
result=nsCRT::strncasecmp((PRUnichar*)aStr1,aStr2,aCount);
else result=nsCRT::strncmp((PRUnichar*)aStr1,aStr2,aCount);
return result;
}
/**
* This method compares the data in one buffer with another
* @update gess 01/04/99
* @param aStr1 is the first buffer to be compared
* @param aStr2 is the 2nd buffer to be compared
* @param aCount is the number of chars to compare
* @param aIgnorecase tells us whether to use a case-sensitive comparison
* @return -1,0,1 depending on <,==,>
*/
PRInt32 Compare1To2(const char* aStr1,const char* aStr2,PRUint32 aCount,PRBool aIgnoreCase){
PRInt32 result;
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();
nsresult result=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 strip chars from a given buffer...
//
/**
* This method removes chars (given in aSet) from the given buffer
*
* @update gess 01/04/99
* @param aString is the buffer to be manipulated
* @param anOffset is starting pos in buffer for manipulation
* @param aCount is the number of chars to compare
* @param aSet tells us which chars to remove from given buffer
* @return the new length of the given buffer
*/
PRInt32 StripChars1(char* aString,PRUint32 anOffset,PRUint32 aCount,const char* aSet){
PRInt32 result=0;
typedef char chartype;
chartype* from = (chartype*)&aString[anOffset];
chartype* end = (chartype*)from + aCount-1;
chartype* to = from;
if(aSet){
PRUint32 aSetLen=strlen(aSet);
while (from <= end) {
chartype ch = *from;
if(kNotFound==FindChar1(aSet,aSetLen,0,ch,PR_FALSE)){
*to++=*from;
}
from++;
}
*to = 0;
}
return to - (chartype*)aString;
}
/**
* This method removes chars (given in aSet) from the given buffer
*
* @update gess 01/04/99
* @param aString is the buffer to be manipulated
* @param anOffset is starting pos in buffer for manipulation
* @param aCount is the number of chars to compare
* @param aSet tells us which chars to remove from given buffer
* @return the new length of the given buffer
*/
PRInt32 StripChars2(char* aString,PRUint32 anOffset,PRUint32 aCount,const char* aSet){
PRInt32 result=0;
typedef PRUnichar chartype;
chartype* from = (chartype*)&aString[anOffset];
chartype* end = (chartype*)from + aCount-1;
chartype* to = from;
if(aSet){
PRUint32 aSetLen=strlen(aSet);
while (from <= end) {
chartype ch = *from;
if(kNotFound==FindChar1(aSet,aSetLen,0,ch,PR_FALSE)){
*to++=*from;
}
from++;
}
*to = 0;
}
return to - (chartype*)aString;
}
typedef PRInt32 (*StripChars)(char* aString,PRUint32 aDestOffset,PRUint32 aCount,const char* aSet);
StripChars gStripChars[]={&StripChars1,&StripChars2};
//----------------------------------------------------------------------------------------
//
// This set of methods is used trim chars from the edges of a buffer...
//
/**
* This method trims chars (given in aSet) from the edges of 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 remove 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 TrimChars1(char* aString,PRUint32 aLength,const char* aSet,PRBool aEliminateLeading,PRBool aEliminateTrailing){
PRInt32 result=0;
typedef char chartype;
chartype* from = (chartype*)aString;
chartype* end = from + aLength -1;
chartype* to = from;
if(aSet) {
PRUint32 aSetLen=strlen(aSet);
//begin by find the first char not in aTrimSet
if(aEliminateLeading) {
while (from <= end) {
chartype ch = *from;
if(kNotFound==FindChar1(aSet,aSetLen,0,ch,PR_FALSE)){
break;
}
from++;
}
}
//Now, find last char not in aTrimSet
if(aEliminateTrailing) {
while(from<=end) {
chartype ch = *end;
if(kNotFound==FindChar1(aSet,aSetLen,0,ch,PR_FALSE)){
break;
}
end--;
}
}
//now rewrite your string without unwanted
//leading or trailing characters.
if (from != to) {
while (from <= end) {
*to++ = *from++;
}
}
else {
to = ++end;
}
*to = 0;
}
return to - (chartype*)aString;
}
/**
* This method trims chars (given in aSet) from the edges of 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 remove 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 TrimChars2(char* aString,PRUint32 aLength,const char* aSet,PRBool aEliminateLeading,PRBool aEliminateTrailing){
PRInt32 result=0;
typedef PRUnichar chartype;
chartype* from = (chartype*)aString;
chartype* end = from + aLength -1;
chartype* to = from;
if(aSet) {
PRUint32 aSetLen=strlen(aSet);
//begin by find the first char not in aTrimSet
if(aEliminateLeading) {
while (from <= end) {
chartype ch = *from;
if(kNotFound==FindChar1(aSet,aSetLen,0,ch,PR_FALSE)){
break;
}
from++;
}
}
//Now, find last char not in aTrimSet
if(aEliminateTrailing) {
while(from<=end) {
chartype ch = *end;
if(kNotFound==FindChar1(aSet,aSetLen,0,ch,PR_FALSE)){
break;
}
end--;
}
}
//now rewrite your string without unwanted
//leading or trailing characters.
if (from != to) {
while (from <= end) {
*to++ = *from++;
}
}
else {
to = ++end;
}
*to = 0;
}
return to - (chartype*)aString;
}
typedef PRInt32 (*TrimChars)(char* aString,PRUint32 aCount,const char* aSet,PRBool aEliminateLeading,PRBool aEliminateTrailing);
TrimChars gTrimChars[]={&TrimChars1,&TrimChars2};
//----------------------------------------------------------------------------------------
//
// 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,PRUint32 aChar,PRBool aEliminateLeading,PRBool aEliminateTrailing){
PRInt32 result=0;
TrimChars1(aString,aLength,aSet,aEliminateLeading,aEliminateTrailing);
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 ch = *from++;
if(kNotFound!=FindChar1(aSet,aSetLen,0,ch,PR_FALSE)){
*to++ = (char)aChar;
while (from <= end) {
ch = *from++;
if(kNotFound==FindChar1(aSet,aSetLen,0,ch,PR_FALSE)){
*to++ = ch;
break;
}
}
} else {
*to++ = ch;
}
}
*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,PRUint32 aChar,PRBool aEliminateLeading,PRBool aEliminateTrailing){
PRInt32 result=0;
TrimChars2(aString,aLength,aSet,aEliminateLeading,aEliminateTrailing);
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 ch = *from++;
if(kNotFound!=FindChar1(aSet,aSetLen,0,ch,PR_FALSE)){
*to++ = (PRUnichar)aChar;
while (from <= end) {
ch = *from++;
if(kNotFound==FindChar1(aSet,aSetLen,0,ch,PR_FALSE)){
*to++ = ch;
break;
}
}
} else {
*to++ = ch;
}
}
*to = 0;
}
return to - (chartype*)aString;
}
typedef PRInt32 (*CompressChars)(char* aString,PRUint32 aCount,const char* aSet,PRUint32 aChar,PRBool aEliminateLeading,PRBool aEliminateTrailing);
CompressChars gCompressChars[]={&CompressChars1,&CompressChars2};
#endif
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