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138 lines
3.4 KiB
C++
138 lines
3.4 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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#include "nsIByteBuffer.h"
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#include "nsIInputStream.h"
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#include "nsCRT.h"
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#define MIN_BUFFER_SIZE 32
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class ByteBufferImpl : public nsIByteBuffer {
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public:
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ByteBufferImpl(PRUint32 aBufferSize);
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~ByteBufferImpl();
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NS_DECL_ISUPPORTS
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virtual PRUint32 GetLength(void) const;
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virtual PRUint32 GetBufferSize(void) const;
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virtual char* GetBuffer() const;
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virtual PRBool Grow(PRUint32 aNewSize);
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virtual PRInt32 Fill(nsresult* aErrorCode, nsIInputStream* aStream,
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PRUint32 aKeep);
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char* mBuffer;
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PRUint32 mSpace;
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PRUint32 mLength;
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};
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ByteBufferImpl::ByteBufferImpl(PRUint32 aBufferSize)
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{
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if (aBufferSize < MIN_BUFFER_SIZE) {
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aBufferSize = MIN_BUFFER_SIZE;
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}
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mSpace = aBufferSize;
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mBuffer = new char[aBufferSize];
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mLength = 0;
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NS_INIT_REFCNT();
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}
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NS_DEFINE_IID(kByteBufferIID,NS_IBYTE_BUFFER_IID);
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NS_IMPL_ISUPPORTS(ByteBufferImpl,kByteBufferIID)
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ByteBufferImpl::~ByteBufferImpl()
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{
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if (nsnull != mBuffer) {
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delete mBuffer;
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mBuffer = nsnull;
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}
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mLength = 0;
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}
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PRUint32 ByteBufferImpl::GetLength(void) const
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{
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return mLength;
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}
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PRUint32 ByteBufferImpl::GetBufferSize(void) const
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{
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return mSpace;
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}
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char* ByteBufferImpl::GetBuffer(void) const
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{
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return mBuffer;
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}
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PRBool ByteBufferImpl::Grow(PRUint32 aNewSize)
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{
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if (aNewSize < MIN_BUFFER_SIZE) {
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aNewSize = MIN_BUFFER_SIZE;
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}
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char* newbuf = new char[aNewSize];
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if (nsnull != newbuf) {
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if (0 != mLength) {
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nsCRT::memcpy(newbuf, mBuffer, mLength);
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}
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delete mBuffer;
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mBuffer = newbuf;
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return PR_TRUE;
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}
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return PR_FALSE;
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}
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PRInt32 ByteBufferImpl::Fill(nsresult* aErrorCode, nsIInputStream* aStream,
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PRUint32 aKeep)
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{
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NS_PRECONDITION(nsnull != aStream, "null stream");
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NS_PRECONDITION(aKeep <= mLength, "illegal keep count");
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if ((nsnull == aStream) || (PRUint32(aKeep) > PRUint32(mLength))) {
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// whoops
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*aErrorCode = NS_BASE_STREAM_ILLEGAL_ARGS;
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return -1;
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}
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if (0 != aKeep) {
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// Slide over kept data
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nsCRT::memmove(mBuffer, mBuffer + (mLength - aKeep), aKeep);
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}
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// Read in some new data
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mLength = aKeep;
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PRUint32 nb;
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*aErrorCode = aStream->Read(mBuffer + aKeep, mSpace - aKeep, &nb);
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if (NS_SUCCEEDED(*aErrorCode)) {
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mLength += nb;
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}
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else
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nb = 0;
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return nb;
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}
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NS_BASE nsresult NS_NewByteBuffer(nsIByteBuffer** aInstancePtrResult,
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nsISupports* aOuter,
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PRUint32 aBufferSize)
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{
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if (nsnull != aOuter) {
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return NS_ERROR_NO_AGGREGATION;
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}
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ByteBufferImpl* it = new ByteBufferImpl(aBufferSize);
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if (nsnull == it) {
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return NS_ERROR_OUT_OF_MEMORY;
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}
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return it->QueryInterface(kByteBufferIID, (void **) aInstancePtrResult);
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}
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