96 lines
2.4 KiB
C++
96 lines
2.4 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim:set ts=2 sw=2 sts=2 et cindent: */
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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 "SimpleBuffer.h"
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#include <algorithm>
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namespace mozilla {
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namespace net {
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SimpleBuffer::SimpleBuffer()
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: mStatus(NS_OK)
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, mAvailable(0)
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{
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mOwningThread = PR_GetCurrentThread();
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}
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nsresult SimpleBuffer::Write(char *src, size_t len)
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{
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MOZ_ASSERT(PR_GetCurrentThread() == mOwningThread);
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if (NS_FAILED(mStatus)) {
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return mStatus;
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}
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while (len > 0) {
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SimpleBufferPage *p = mBufferList.getLast();
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if (p && (p->mWriteOffset == SimpleBufferPage::kSimpleBufferPageSize)) {
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// no room.. make a new page
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p = nullptr;
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}
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if (!p) {
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p = new (fallible) SimpleBufferPage();
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if (!p) {
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mStatus = NS_ERROR_OUT_OF_MEMORY;
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return mStatus;
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}
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mBufferList.insertBack(p);
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}
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size_t roomOnPage = SimpleBufferPage::kSimpleBufferPageSize - p->mWriteOffset;
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size_t toWrite = std::min(roomOnPage, len);
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memcpy(p->mBuffer + p->mWriteOffset, src, toWrite);
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src += toWrite;
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len -= toWrite;
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p->mWriteOffset += toWrite;
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mAvailable += toWrite;
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}
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return NS_OK;
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}
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size_t SimpleBuffer::Read(char *dest, size_t maxLen)
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{
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MOZ_ASSERT(PR_GetCurrentThread() == mOwningThread);
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if (NS_FAILED(mStatus)) {
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return 0;
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}
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size_t rv = 0;
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for (SimpleBufferPage *p = mBufferList.getFirst();
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p && (rv < maxLen); p = mBufferList.getFirst()) {
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size_t avail = p->mWriteOffset - p->mReadOffset;
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size_t toRead = std::min(avail, (maxLen - rv));
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memcpy(dest + rv, p->mBuffer + p->mReadOffset, toRead);
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rv += toRead;
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p->mReadOffset += toRead;
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if (p->mReadOffset == p->mWriteOffset) {
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p->remove();
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delete p;
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}
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}
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MOZ_ASSERT(mAvailable >= rv);
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mAvailable -= rv;
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return rv;
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}
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size_t SimpleBuffer::Available()
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{
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MOZ_ASSERT(PR_GetCurrentThread() == mOwningThread);
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return NS_SUCCEEDED(mStatus) ? mAvailable : 0;
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}
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void SimpleBuffer::Clear()
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{
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MOZ_ASSERT(PR_GetCurrentThread() == mOwningThread);
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SimpleBufferPage *p;
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while ((p = mBufferList.popFirst())) {
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delete p;
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}
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mAvailable = 0;
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}
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} // namespace net
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} // namespace mozilla
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