зеркало из https://github.com/mozilla/gecko-dev.git
138 строки
3.0 KiB
C++
138 строки
3.0 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "nsByteBuffer.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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ByteBufferImpl::ByteBufferImpl(void)
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: mBuffer(NULL), mSpace(0), mLength(0)
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{
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}
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NS_IMETHODIMP
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ByteBufferImpl::Init(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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mLength = 0;
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mBuffer = new char[aBufferSize];
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return mBuffer ? NS_OK : NS_ERROR_OUT_OF_MEMORY;
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}
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NS_IMPL_ISUPPORTS1(ByteBufferImpl,nsIByteBuffer)
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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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nsresult
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ByteBufferImpl::Create(nsISupports *aOuter, REFNSIID aIID, void **aResult)
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{
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if (aOuter)
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return NS_ERROR_NO_AGGREGATION;
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ByteBufferImpl* it = new ByteBufferImpl();
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if (nsnull == it)
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return NS_ERROR_OUT_OF_MEMORY;
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NS_ADDREF(it);
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nsresult rv = it->QueryInterface(aIID, (void**)aResult);
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NS_RELEASE(it);
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return rv;
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}
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NS_IMETHODIMP_(PRUint32)
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ByteBufferImpl::GetLength(void) const
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{
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return mLength;
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}
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NS_IMETHODIMP_(PRUint32)
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ByteBufferImpl::GetBufferSize(void) const
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{
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return mSpace;
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}
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NS_IMETHODIMP_(char*)
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ByteBufferImpl::GetBuffer(void) const
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{
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return mBuffer;
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}
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NS_IMETHODIMP_(bool)
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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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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 true;
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}
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return false;
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}
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NS_IMETHODIMP_(PRInt32)
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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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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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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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nsresult rv;
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nsIByteBuffer* buf;
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rv = ByteBufferImpl::Create(aOuter, NS_GET_IID(nsIByteBuffer), (void**)&buf);
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if (NS_FAILED(rv)) return rv;
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rv = buf->Init(aBufferSize);
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if (NS_FAILED(rv)) {
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NS_RELEASE(buf);
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return rv;
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}
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*aInstancePtrResult = buf;
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return rv;
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}
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