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gecko-dev/xpcom/ds/nsStr.cpp

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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 nsStr data structure.
This general purpose buffer management class is used as the basis for our strings.
It's benefits include:
1. An efficient set of library style functions for manipulating nsStrs
2. Support for 1 and 2 byte character strings (which can easily be increased to n)
3. Unicode awareness and interoperability.
*******************************************************************************************/
#include "nsStr.h"
#include "bufferRoutines.h"
#include "stdio.h" //only used for printf
#include "nsCRT.h"
#include "nsDeque.h"
static const char* kFoolMsg = "Error: Some fool overwrote the shared buffer.";
//----------------------------------------------------------------------------------------
// The following is a memory agent who knows how to recycled (pool) freed memory...
//----------------------------------------------------------------------------------------
/**************************************************************
Define the char* (pooled) deallocator class...
**************************************************************/
/*
class nsBufferDeallocator: public nsDequeFunctor{
public:
virtual void* operator()(void* anObject) {
char* aCString= (char*)anObject;
delete [] aCString;
return 0;
}
};
class nsPoolingMemoryAgent : public nsMemoryAgent{
public:
nsPoolingMemoryAgent() {
memset(mPools,0,sizeof(mPools));
}
virtual ~nsPoolingMemoryAgent() {
nsBufferDeallocator theDeallocator;
int i=0;
for(i=0;i<10;i++){
if(mPools[i]){
mPools[i]->ForEach(theDeallocator); //now delete the buffers
}
delete mPools[i];
mPools[i]=0;
}
}
virtual PRBool Alloc(nsStr& aDest,PRUint32 aCount) {
//we're given the acount value in charunits; we have to scale up by the charsize.
int theShift=4;
PRUint32 theNewCapacity=eDefaultSize;
while(theNewCapacity<aCount){
theNewCapacity<<=1;
theShift++;
}
aDest.mCapacity=theNewCapacity++;
theShift=(theShift<<aDest.mCharSize)-4;
if((theShift<12) && (mPools[theShift])){
aDest.mStr=(char*)mPools[theShift]->Pop();
}
if(!aDest.mStr) {
//we're given the acount value in charunits; we have to scale up by the charsize.
size_t theSize=(theNewCapacity<<aDest.mCharSize);
aDest.mStr=new char[theSize];
}
aDest.mOwnsBuffer=1;
return PRBool(aDest.mStr!=0);
}
virtual PRBool Free(nsStr& aDest){
if(aDest.mStr){
if(aDest.mOwnsBuffer){
int theShift=1;
unsigned int theValue=1;
while((theValue<<=1)<aDest.mCapacity){
theShift++;
}
theShift-=4;
if(theShift<12){
if(!mPools[theShift]){
mPools[theShift]=new nsDeque(0);
}
mPools[theShift]->Push(aDest.mStr);
}
else delete [] aDest.mStr; //it's too big. Just delete it.
}
aDest.mStr=0;
aDest.mOwnsBuffer=0;
return PR_TRUE;
}
return PR_FALSE;
}
nsDeque* mPools[16];
};
*/
static char* gCommonEmptyBuffer=0;
/**
*
* @update gess10/30/98
* @param
* @return
*/
char* GetSharedEmptyBuffer() {
if(!gCommonEmptyBuffer) {
const size_t theDfltSize=5;
gCommonEmptyBuffer=new char[theDfltSize];
if(gCommonEmptyBuffer){
nsCRT::zero(gCommonEmptyBuffer,theDfltSize);
gCommonEmptyBuffer[0]=0;
}
else {
printf("%s\n","Memory allocation error!");
}
}
return gCommonEmptyBuffer;
}
/**
* This method initializes all the members of the nsStr structure
*
* @update gess10/30/98
* @param
* @return
*/
void nsStr::Initialize(nsStr& aDest,eCharSize aCharSize) {
aDest.mStr=GetSharedEmptyBuffer();
aDest.mLength=0;
aDest.mCapacity=0;
aDest.mCharSize=aCharSize;
aDest.mOwnsBuffer=0;
NS_ASSERTION(gCommonEmptyBuffer[0]==0,kFoolMsg);
}
/**
* This method initializes all the members of the nsStr structure
* @update gess10/30/98
* @param
* @return
*/
void nsStr::Initialize(nsStr& aDest,char* aCString,PRUint32 aCapacity,PRUint32 aLength,eCharSize aCharSize,PRBool aOwnsBuffer){
aDest.mStr=(aCString) ? aCString : GetSharedEmptyBuffer();
aDest.mLength=aLength;
aDest.mCapacity=aCapacity;
aDest.mCharSize=aCharSize;
aDest.mOwnsBuffer=aOwnsBuffer;
NS_ASSERTION(gCommonEmptyBuffer[0]==0,kFoolMsg);
}
/**
*
* @update gess10/30/98
* @param
* @return
*/
nsIMemoryAgent* GetDefaultAgent(void){
// static nsPoolingMemoryAgent gDefaultAgent;
static nsMemoryAgent gDefaultAgent;
return (nsIMemoryAgent*)&gDefaultAgent;
}
/**
* This member destroys the memory buffer owned by an nsStr object (if it actually owns it)
* @update gess10/30/98
* @param
* @return
*/
void nsStr::Destroy(nsStr& aDest,nsIMemoryAgent* anAgent) {
if((aDest.mStr) && (aDest.mStr!=GetSharedEmptyBuffer())) {
if(!anAgent)
anAgent=GetDefaultAgent();
if(anAgent) {
anAgent->Free(aDest);
}
else{
printf("%s\n","Leak occured in nsStr.");
}
}
}
/**
* This method gets called when the internal buffer needs
* to grow to a given size. The original contents are not preserved.
* @update gess 3/30/98
* @param aNewLength -- new capacity of string in charSize units
* @return void
*/
void nsStr::EnsureCapacity(nsStr& aString,PRUint32 aNewLength,nsIMemoryAgent* anAgent) {
if(aNewLength>aString.mCapacity) {
nsIMemoryAgent* theAgent=(anAgent) ? anAgent : GetDefaultAgent();
theAgent->Realloc(aString,aNewLength);
AddNullTerminator(aString);
}
NS_ASSERTION(gCommonEmptyBuffer[0]==0,kFoolMsg);
}
/**
* This method gets called when the internal buffer needs
* to grow to a given size. The original contents ARE preserved.
* @update gess 3/30/98
* @param aNewLength -- new capacity of string in charSize units
* @return void
*/
void nsStr::GrowCapacity(nsStr& aDest,PRUint32 aNewLength,nsIMemoryAgent* anAgent) {
if(aNewLength>aDest.mCapacity) {
nsStr theTempStr;
nsStr::Initialize(theTempStr,aDest.mCharSize);
nsIMemoryAgent* theAgent=(anAgent) ? anAgent : GetDefaultAgent();
EnsureCapacity(theTempStr,aNewLength,theAgent);
if(aDest.mLength) {
Append(theTempStr,aDest,0,aDest.mLength,theAgent);
}
theAgent->Free(aDest);
aDest.mStr = theTempStr.mStr;
theTempStr.mStr=0; //make sure to null this out so that you don't lose the buffer you just stole...
aDest.mLength=theTempStr.mLength;
aDest.mCapacity=theTempStr.mCapacity;
aDest.mOwnsBuffer=theTempStr.mOwnsBuffer;
}
NS_ASSERTION(gCommonEmptyBuffer[0]==0,kFoolMsg);
}
/**
* Replaces the contents of aDest with aSource, up to aCount of chars.
* @update gess10/30/98
* @param aDest is the nsStr that gets changed.
* @param aSource is where chars are copied from
* @param aCount is the number of chars copied from aSource
*/
void nsStr::Assign(nsStr& aDest,const nsStr& aSource,PRUint32 anOffset,PRInt32 aCount,nsIMemoryAgent* anAgent){
if(&aDest!=&aSource){
Truncate(aDest,0,anAgent);
Append(aDest,aSource,anOffset,aCount,anAgent);
}
}
/**
* This method appends the given nsStr to this one. Note that we have to
* pay attention to the underlying char-size of both structs.
* @update gess10/30/98
* @param aDest is the nsStr to be manipulated
* @param aSource is where char are copied from
* @aCount is the number of bytes to be copied
*/
void nsStr::Append(nsStr& aDest,const nsStr& aSource,PRUint32 anOffset,PRInt32 aCount,nsIMemoryAgent* anAgent){
if(anOffset<aSource.mLength){
PRUint32 theRealLen=(aCount<0) ? aSource.mLength : MinInt(aCount,aSource.mLength);
PRUint32 theLength=(anOffset+theRealLen<aSource.mLength) ? theRealLen : (aSource.mLength-anOffset);
if(0<theLength){
if(aDest.mLength+theLength > aDest.mCapacity) {
GrowCapacity(aDest,aDest.mLength+theLength,anAgent);
}
//now append new chars, starting at offset
(*gCopyChars[aSource.mCharSize][aDest.mCharSize])(aDest.mStr,aDest.mLength,aSource.mStr,anOffset,theLength);
aDest.mLength+=theLength;
}
}
AddNullTerminator(aDest);
NS_ASSERTION(gCommonEmptyBuffer[0]==0,kFoolMsg);
}
/**
* This method inserts up to "aCount" chars from a source nsStr into a dest nsStr.
* @update gess10/30/98
* @param aDest is the nsStr that gets changed
* @param aDestOffset is where in aDest the insertion is to occur
* @param aSource is where chars are copied from
* @param aSrcOffset is where in aSource chars are copied from
* @param aCount is the number of chars from aSource to be inserted into aDest
*/
void nsStr::Insert( nsStr& aDest,PRUint32 aDestOffset,const nsStr& aSource,PRUint32 aSrcOffset,PRInt32 aCount,nsIMemoryAgent* anAgent){
//there are a few cases for insert:
// 1. You're inserting chars into an empty string (assign)
// 2. You're inserting onto the end of a string (append)
// 3. You're inserting onto the 1..n-1 pos of a string (the hard case).
if(0<aSource.mLength){
if(aDest.mLength){
if(aDestOffset<aDest.mLength){
PRInt32 theRealLen=(aCount<0) ? aSource.mLength : MinInt(aCount,aSource.mLength);
PRInt32 theLength=(aSrcOffset+theRealLen<aSource.mLength) ? theRealLen : (aSource.mLength-aSrcOffset);
if(aSrcOffset<aSource.mLength) {
//here's the only new case we have to handle.
//chars are really being inserted into our buffer...
GrowCapacity(aDest,aDest.mLength+theLength,anAgent);
//shift the chars right by theDelta...
(*gShiftChars[aDest.mCharSize][KSHIFTRIGHT])(aDest.mStr,aDest.mLength,aDestOffset,theLength);
//now insert new chars, starting at offset
(*gCopyChars[aSource.mCharSize][aDest.mCharSize])(aDest.mStr,aDestOffset,aSource.mStr,aSrcOffset,theLength);
//finally, make sure to update the string length...
aDest.mLength+=theLength;
AddNullTerminator(aDest);
}//if
//else nothing to do!
}
else Append(aDest,aSource,0,aCount,anAgent);
}
else Append(aDest,aSource,0,aCount,anAgent);
}
NS_ASSERTION(gCommonEmptyBuffer[0]==0,kFoolMsg);
}
/**
* This method deletes up to aCount chars from aDest
* @update gess10/30/98
* @param aDest is the nsStr to be manipulated
* @param aDestOffset is where in aDest deletion is to occur
* @param aCount is the number of chars to be deleted in aDest
*/
void nsStr::Delete(nsStr& aDest,PRUint32 aDestOffset,PRUint32 aCount,nsIMemoryAgent* anAgent){
if(aDestOffset<aDest.mLength){
PRUint32 theDelta=aDest.mLength-aDestOffset;
PRUint32 theLength=(theDelta<aCount) ? theDelta : aCount;
if(aDestOffset+theLength<aDest.mLength) {
//if you're here, it means we're cutting chars out of the middle of the string...
//so shift the chars left by theLength...
(*gShiftChars[aDest.mCharSize][KSHIFTLEFT])(aDest.mStr,aDest.mLength,aDestOffset,theLength);
aDest.mLength-=theLength;
}
else Truncate(aDest,aDestOffset,anAgent);
}//if
NS_ASSERTION(gCommonEmptyBuffer[0]==0,kFoolMsg);
}
/**
* This method truncates the given nsStr at given offset
* @update gess10/30/98
* @param aDest is the nsStr to be truncated
* @param aDestOffset is where in aDest truncation is to occur
*/
void nsStr::Truncate(nsStr& aDest,PRUint32 aDestOffset,nsIMemoryAgent* anAgent){
if(aDestOffset<aDest.mLength){
aDest.mLength=aDestOffset;
AddNullTerminator(aDest);
}
NS_ASSERTION(gCommonEmptyBuffer[0]==0,kFoolMsg);
}
/**
* This method forces the given string to upper or lowercase
* @update gess1/7/99
* @param aDest is the string you're going to change
* @param aToUpper: if TRUE, then we go uppercase, otherwise we go lowercase
* @return
*/
void nsStr::ChangeCase(nsStr& aDest,PRBool aToUpper) {
// somehow UnicharUtil return failed, fallback to the old ascii only code
gCaseConverters[aDest.mCharSize](aDest.mStr,aDest.mLength,aToUpper);
NS_ASSERTION(gCommonEmptyBuffer[0]==0,kFoolMsg);
}
/**
*
* @update gess1/7/99
* @param
* @return
*/
void nsStr::Trim(nsStr& aDest,const char* aSet,PRBool aEliminateLeading,PRBool aEliminateTrailing){
if((aDest.mLength>0) && aSet){
PRInt32 theIndex=-1;
PRInt32 theMax=aDest.mLength;
PRInt32 theSetLen=nsCRT::strlen(aSet);
if(aEliminateLeading) {
while(++theIndex<=theMax) {
PRUnichar theChar=GetCharAt(aDest,theIndex);
PRInt32 thePos=gFindChars[eOneByte](aSet,theSetLen,0,theChar,PR_FALSE);
if(kNotFound==thePos)
break;
}
if(0<theIndex) {
if(theIndex<theMax) {
Delete(aDest,0,theIndex,0);
}
else Truncate(aDest,0);
}
}
if(aEliminateTrailing) {
theIndex=aDest.mLength;
PRInt32 theNewLen=theIndex;
while(--theIndex>0) {
PRUnichar theChar=GetCharAt(aDest,theIndex); //read at end now...
PRInt32 thePos=gFindChars[eOneByte](aSet,theSetLen,0,theChar,PR_FALSE);
if(kNotFound<thePos)
theNewLen=theIndex;
else break;
}
if(theNewLen<theMax) {
Truncate(aDest,theNewLen);
}
}
}
NS_ASSERTION(gCommonEmptyBuffer[0]==0,kFoolMsg);
}
/**
*
* @update gess1/7/99
* @param
* @return
*/
void nsStr::CompressSet(nsStr& aDest,const char* aSet,PRBool aEliminateLeading,PRBool aEliminateTrailing){
Trim(aDest,aSet,aEliminateLeading,aEliminateTrailing);
PRUint32 aNewLen=gCompressChars[aDest.mCharSize](aDest.mStr,aDest.mLength,aSet);
aDest.mLength=aNewLen;
NS_ASSERTION(gCommonEmptyBuffer[0]==0,kFoolMsg);
}
/**************************************************************
Searching methods...
**************************************************************/
/**
* This searches aDest for a given substring
*
* @update gess 3/25/98
* @param aDest string to search
* @param aTarget is the substring you're trying to find.
* @param aIgnorecase indicates case sensitivity of search
* @param anOffset tells us where to start the search
* @return index in aDest where member of aSet occurs, or -1 if not found
*/
PRInt32 nsStr::FindSubstr(const nsStr& aDest,const nsStr& aTarget, PRBool aIgnoreCase,PRUint32 anOffset) {
PRInt32 result=kNotFound;
if(anOffset<aDest.mLength) {
PRInt32 theMax=aDest.mLength-aTarget.mLength;
PRInt32 index=(anOffset ? anOffset : theMax);
if((aDest.mLength>=aTarget.mLength) && (aTarget.mLength>0) && (index>=0)){
PRInt32 theTargetMax=aTarget.mLength;
while(index<=theMax) {
PRInt32 theSubIndex=-1;
PRBool matches=PR_TRUE;
while((++theSubIndex<theTargetMax) && (matches)){
PRUnichar theChar=(aIgnoreCase) ? nsCRT::ToLower(GetCharAt(aDest,index+theSubIndex)) : GetCharAt(aDest,index+theSubIndex);
PRUnichar theTargetChar=(aIgnoreCase) ? nsCRT::ToLower(GetCharAt(aTarget,theSubIndex)) : GetCharAt(aTarget,theSubIndex);
matches=PRBool(theChar==theTargetChar);
}
if(matches) {
result=index;
break;
}
index++;
} //while
}//if
}//if
return result;
}
/**
* This searches aDest for a given character
*
* @update gess 3/25/98
* @param aDest string to search
* @param char is the character you're trying to find.
* @param aIgnorecase indicates case sensitivity of search
* @param anOffset tells us where to start the search
* @return index in aDest where member of aSet occurs, or -1 if not found
*/
PRInt32 nsStr::FindChar(const nsStr& aDest,PRUnichar aChar, PRBool aIgnoreCase,PRUint32 anOffset) {
PRInt32 result=gFindChars[aDest.mCharSize](aDest.mStr,aDest.mLength,anOffset,aChar,aIgnoreCase);
return result;
}
/**
* This searches aDest for a character found in aSet.
*
* @update gess 3/25/98
* @param aDest string to search
* @param aSet contains a list of chars to be searched for
* @param aIgnorecase indicates case sensitivity of search
* @param anOffset tells us where to start the search
* @return index in aDest where member of aSet occurs, or -1 if not found
*/
PRInt32 nsStr::FindCharInSet(const nsStr& aDest,const nsStr& aSet,PRBool aIgnoreCase,PRUint32 anOffset) {
PRInt32 index=anOffset-1;
PRInt32 thePos;
while(++index<(PRInt32)aDest.mLength) {
PRUnichar theChar=GetCharAt(aDest,index);
thePos=gFindChars[aSet.mCharSize](aSet.mStr,aSet.mLength,0,theChar,aIgnoreCase);
if(kNotFound!=thePos)
return index;
} //while
return kNotFound;
}
/**************************************************************
Reverse Searching methods...
**************************************************************/
/**
* This searches aDest (in reverse) for a given substring
*
* @update gess 3/25/98
* @param aDest string to search
* @param aTarget is the substring you're trying to find.
* @param aIgnorecase indicates case sensitivity of search
* @param anOffset tells us where to start the search
* @return index in aDest where member of aSet occurs, or -1 if not found
*/
PRInt32 nsStr::RFindSubstr(const nsStr& aDest,const nsStr& aTarget, PRBool aIgnoreCase,PRUint32 anOffset) {
PRInt32 result=kNotFound;
if(anOffset<aDest.mLength) {
PRInt32 index=(anOffset ? anOffset : aDest.mLength-aTarget.mLength);
if((aDest.mLength>=aTarget.mLength) && (aTarget.mLength>0) && (index>=0)){
nsStr theCopy;
nsStr::Initialize(theCopy,eOneByte);
nsStr::Assign(theCopy,aTarget,0,aTarget.mLength,0);
if(aIgnoreCase){
nsStr::ChangeCase(theCopy,PR_FALSE); //force to lowercase
}
PRInt32 theTargetMax=theCopy.mLength;
while(index>=0) {
PRInt32 theSubIndex=-1;
PRBool matches=PR_FALSE;
if(index+theCopy.mLength<=aDest.mLength) {
matches=PR_TRUE;
while((++theSubIndex<theTargetMax) && (matches)){
PRUnichar theDestChar=(aIgnoreCase) ? nsCRT::ToLower(GetCharAt(aDest,index+theSubIndex)) : GetCharAt(aDest,index+theSubIndex);
PRUnichar theTargetChar=GetCharAt(theCopy,theSubIndex);
matches=PRBool(theDestChar==theTargetChar);
} //while
} //if
if(matches) {
result=index;
break;
}
index--;
} //while
nsStr::Destroy(theCopy,0);
}//if
}//if
return result;
}
/**
* This searches aDest (in reverse) for a given character
*
* @update gess 3/25/98
* @param aDest string to search
* @param char is the character you're trying to find.
* @param aIgnorecase indicates case sensitivity of search
* @param anOffset tells us where to start the search
* @return index in aDest where member of aSet occurs, or -1 if not found
*/
PRInt32 nsStr::RFindChar(const nsStr& aDest,PRUnichar aChar, PRBool aIgnoreCase,PRUint32 anOffset) {
PRInt32 result=gRFindChars[aDest.mCharSize](aDest.mStr,aDest.mLength,anOffset,aChar,aIgnoreCase);
return result;
}
/**
* This searches aDest (in reverese) for a character found in aSet.
*
* @update gess 3/25/98
* @param aDest string to search
* @param aSet contains a list of chars to be searched for
* @param aIgnorecase indicates case sensitivity of search
* @param anOffset tells us where to start the search
* @return index in aDest where member of aSet occurs, or -1 if not found
*/
PRInt32 nsStr::RFindCharInSet(const nsStr& aDest,const nsStr& aSet,PRBool aIgnoreCase,PRUint32 anOffset) {
PRInt32 offset=aDest.mLength-anOffset;
PRInt32 thePos;
while(--offset>=0) {
PRUnichar theChar=GetCharAt(aDest,offset);
thePos=gRFindChars[aSet.mCharSize](aSet.mStr,aSet.mLength,0,theChar,aIgnoreCase);
if(kNotFound!=thePos)
return offset;
} //while
return kNotFound;
}
/**
* Compare source and dest strings, up to an (optional max) number of chars
* @param aDest is the first str to compare
* @param aSource is the second str to compare
* @param aCount -- if (-1), then we use length of longer string; if (0<aCount) then it gives the max # of chars to compare
* @param aIgnorecase tells us whether to search with case sensitivity
* @return aDest<aSource=-1;aDest==aSource==0;aDest>aSource=1
*/
PRInt32 nsStr::Compare(const nsStr& aDest,const nsStr& aSource,PRInt32 aCount,PRBool aIgnoreCase) {
PRInt32 result=0;
if(aCount) {
PRInt32 minlen=(aSource.mLength<aDest.mLength) ? aSource.mLength : aDest.mLength;
if(0==minlen) {
if ((aDest.mLength == 0) && (aSource.mLength == 0))
return 0;
if (aDest.mLength == 0)
return -1;
return 1;
}
PRInt32 maxlen=(aSource.mLength<aDest.mLength) ? aDest.mLength : aSource.mLength;
aCount = (aCount<0) ? maxlen : MinInt(aCount,maxlen);
result=(*gCompare[aDest.mCharSize][aSource.mCharSize])(aDest.mStr,aSource.mStr,aCount,aIgnoreCase);
}
return result;
}
//----------------------------------------------------------------------------------------
CSharedStrBuffer::CSharedStrBuffer(char* aString,PRBool aStackBased,PRUint32 aCapacity,PRInt32 aLength) {
mBuffer=aString;
mCharSize=eOneByte;
mStackBased=aStackBased;
mLength=mCapacity=0;
if(aString && aCapacity>1) {
mCapacity=aCapacity-1;
mLength=(-1==aLength) ? strlen(aString) : aLength;
if(mLength>PRInt32(mCapacity))
mLength=mCapacity;
}
}
CSharedStrBuffer::CSharedStrBuffer(PRUnichar* aString,PRBool aStackBased,PRUint32 aCapacity,PRInt32 aLength) {
mBuffer=(char*)aString;
mCharSize=eTwoByte;
mStackBased=aStackBased;
mLength=mCapacity=0;
if(aString && aCapacity>1) {
mCapacity=aCapacity-1;
mLength=(-1==aLength) ? nsCRT::strlen(aString) : aLength;
if(mLength>PRInt32(mCapacity))
mLength=mCapacity;
}
}
//----------------------------------------------------------------------------------------
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