mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-12-28 03:18:41 +00:00
143 lines
3.8 KiB
C++
143 lines
3.8 KiB
C++
/* -*- 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.
|
|
*/
|
|
#include "nsIUnicharBuffer.h"
|
|
#include "nsIUnicharInputStream.h"
|
|
#include "nsCRT.h"
|
|
|
|
#define MIN_BUFFER_SIZE 32
|
|
|
|
class UnicharBufferImpl : public nsIUnicharBuffer {
|
|
public:
|
|
UnicharBufferImpl(PRUint32 aBufferSize);
|
|
~UnicharBufferImpl();
|
|
|
|
NS_DECL_ISUPPORTS
|
|
virtual PRInt32 GetLength() const;
|
|
virtual PRInt32 GetBufferSize() const;
|
|
virtual PRUnichar* GetBuffer() const;
|
|
virtual PRBool Grow(PRInt32 aNewSize);
|
|
virtual PRInt32 Fill(nsresult* aErrorCode, nsIUnicharInputStream* aStream,
|
|
PRInt32 aKeep);
|
|
|
|
PRUnichar* mBuffer;
|
|
PRUint32 mSpace;
|
|
PRUint32 mLength;
|
|
};
|
|
|
|
UnicharBufferImpl::UnicharBufferImpl(PRUint32 aBufferSize)
|
|
{
|
|
if (aBufferSize < MIN_BUFFER_SIZE) {
|
|
aBufferSize = MIN_BUFFER_SIZE;
|
|
}
|
|
mSpace = aBufferSize;
|
|
mBuffer = new PRUnichar[aBufferSize];
|
|
mLength = 0;
|
|
NS_INIT_REFCNT();
|
|
}
|
|
|
|
NS_DEFINE_IID(kUnicharBufferIID, NS_IUNICHAR_BUFFER_IID);
|
|
NS_IMPL_ISUPPORTS(UnicharBufferImpl,kUnicharBufferIID)
|
|
|
|
UnicharBufferImpl::~UnicharBufferImpl()
|
|
{
|
|
if (nsnull != mBuffer) {
|
|
delete mBuffer;
|
|
mBuffer = nsnull;
|
|
}
|
|
mLength = 0;
|
|
}
|
|
|
|
PRInt32 UnicharBufferImpl::GetLength() const
|
|
{
|
|
return mLength;
|
|
}
|
|
|
|
PRInt32 UnicharBufferImpl::GetBufferSize() const
|
|
{
|
|
return mSpace;
|
|
}
|
|
|
|
PRUnichar* UnicharBufferImpl::GetBuffer() const
|
|
{
|
|
return mBuffer;
|
|
}
|
|
|
|
PRBool UnicharBufferImpl::Grow(PRInt32 aNewSize)
|
|
{
|
|
if (PRUint32(aNewSize) < MIN_BUFFER_SIZE) {
|
|
aNewSize = MIN_BUFFER_SIZE;
|
|
}
|
|
PRUnichar* newbuf = new PRUnichar[aNewSize];
|
|
if (nsnull != newbuf) {
|
|
if (0 != mLength) {
|
|
nsCRT::memcpy(newbuf, mBuffer, mLength * sizeof(PRUnichar));
|
|
}
|
|
delete mBuffer;
|
|
mBuffer = newbuf;
|
|
return PR_TRUE;
|
|
}
|
|
return PR_FALSE;
|
|
}
|
|
|
|
PRInt32 UnicharBufferImpl::Fill(nsresult* aErrorCode,
|
|
nsIUnicharInputStream* aStream,
|
|
PRInt32 aKeep)
|
|
{
|
|
NS_PRECONDITION(nsnull != aStream, "null stream");
|
|
NS_PRECONDITION(PRUint32(aKeep) < PRUint32(mLength), "illegal keep count");
|
|
if ((nsnull == aStream) || (PRUint32(aKeep) >= PRUint32(mLength))) {
|
|
// whoops
|
|
*aErrorCode = NS_BASE_STREAM_ILLEGAL_ARGS;
|
|
return -1;
|
|
}
|
|
|
|
if (0 != aKeep) {
|
|
// Slide over kept data
|
|
nsCRT::memmove(mBuffer, mBuffer + (mLength - aKeep),
|
|
aKeep * sizeof(PRUnichar));
|
|
}
|
|
|
|
// Read in some new data
|
|
mLength = aKeep;
|
|
PRInt32 amount = mSpace - aKeep;
|
|
PRUint32 nb;
|
|
NS_ASSERTION(aKeep >= 0, "unsigned madness");
|
|
NS_ASSERTION(amount >= 0, "unsigned madness");
|
|
*aErrorCode = aStream->Read(mBuffer, (PRUint32)aKeep, (PRUint32)amount, &nb);
|
|
if (NS_SUCCEEDED(*aErrorCode)) {
|
|
mLength += nb;
|
|
}
|
|
else
|
|
nb = 0;
|
|
return nb;
|
|
}
|
|
|
|
NS_BASE nsresult NS_NewUnicharBuffer(nsIUnicharBuffer** aInstancePtrResult,
|
|
nsISupports* aOuter,
|
|
PRUint32 aBufferSize)
|
|
{
|
|
if (nsnull != aOuter) {
|
|
return NS_ERROR_NO_AGGREGATION;
|
|
}
|
|
UnicharBufferImpl* it = new UnicharBufferImpl(aBufferSize);
|
|
if (nsnull == it) {
|
|
return NS_ERROR_OUT_OF_MEMORY;
|
|
}
|
|
return it->QueryInterface(kUnicharBufferIID, (void **) aInstancePtrResult);
|
|
}
|