Quelle nsPreloadedStream.cpp Sprache: C

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "nsPreloadedStream.h"
#include "nsIRunnable.h"

#include "nsThreadUtils.h"
#include <algorithm>

namespace mozilla {
namespace net {

NS_IMPL_ISUPPORTS(nsPreloadedStream, nsIInputStream, nsIAsyncInputStream,
                  nsIInputStreamCallback)

nsPreloadedStream::nsPreloadedStream(nsIAsyncInputStream* aStream,
                                     const char* data, uint32_t datalen)
    : mStream(aStream),
      mOffset(0),
      mLen(datalen),
      mCallback("nsPreloadedStream") {
  mBuf = (char*)moz_xmalloc(datalen);
  memcpy(mBuf, data, datalen);
}

nsPreloadedStream::~nsPreloadedStream() { free(mBuf); }

NS_IMETHODIMP
nsPreloadedStream::Close() {
  mLen = 0;
  return mStream->Close();
}

NS_IMETHODIMP
nsPreloadedStream::Available(uint64_t* _retval) {
  uint64_t avail = 0;

  nsresult rv = mStream->Available(&avail);
  if (NS_FAILED(rv)) return rv;
  *_retval = avail + mLen;
  return NS_OK;
}

NS_IMETHODIMP
nsPreloadedStream::StreamStatus() { return mStream->StreamStatus(); }

NS_IMETHODIMP
nsPreloadedStream::Read(char* aBuf, uint32_t aCount, uint32_t* _retval) {
  if (!mLen) return mStream->Read(aBuf, aCount, _retval);

  uint32_t toRead = std::min(mLen, aCount);
  memcpy(aBuf, mBuf + mOffset, toRead);
  mOffset += toRead;
  mLen -= toRead;
  *_retval = toRead;
  return NS_OK;
}

NS_IMETHODIMP
nsPreloadedStream::ReadSegments(nsWriteSegmentFun aWriter, void* aClosure,
                                uint32_t aCount, uint32_t* result) {
  if (!mLen) return mStream->ReadSegments(aWriter, aClosure, aCount, result);

  *result = 0;
  while (mLen > 0 && aCount > 0) {
    uint32_t toRead = std::min(mLen, aCount);
    uint32_t didRead = 0;
    nsresult rv;

    rv = aWriter(this, aClosure, mBuf + mOffset, *result, toRead, &didRead);

    if (NS_FAILED(rv)) return NS_OK;

    *result += didRead;
    mOffset += didRead;
    mLen -= didRead;
    aCount -= didRead;
  }

  return NS_OK;
}

NS_IMETHODIMP
nsPreloadedStream::IsNonBlocking(bool* _retval) {
  return mStream->IsNonBlocking(_retval);
}

NS_IMETHODIMP
nsPreloadedStream::CloseWithStatus(nsresult aStatus) {
  mLen = 0;
  return mStream->CloseWithStatus(aStatus);
}

class RunOnThread : public Runnable {
public:
  RunOnThread(nsIAsyncInputStream* aStream, nsIInputStreamCallback* aCallback)
      : Runnable("net::RunOnThread"), mStream(aStream), mCallback(aCallback) {}

  virtual ~RunOnThread() = default;

  NS_IMETHOD Run() override {
    mCallback->OnInputStreamReady(mStream);
    return NS_OK;
  }

private:
  nsCOMPtr<nsIAsyncInputStream> mStream;
  nsCOMPtr<nsIInputStreamCallback> mCallback;
};

NS_IMETHODIMP
nsPreloadedStream::AsyncWait(nsIInputStreamCallback* aCallback, uint32_t aFlags,
                             uint32_t aRequestedCount,
                             nsIEventTarget* aEventTarget) {
  if (!mLen) {
    {
      auto lock = mCallback.Lock();
      *lock = aCallback;
    }
    return mStream->AsyncWait(aCallback ? this : nullptr, aFlags,
                              aRequestedCount, aEventTarget);
  }

  if (!aCallback) return NS_OK;

  if (!aEventTarget) return aCallback->OnInputStreamReady(this);

  nsCOMPtr<nsIRunnable> event = new RunOnThread(this, aCallback);
  return aEventTarget->Dispatch(event, nsIEventTarget::DISPATCH_NORMAL);
}

NS_IMETHODIMP
nsPreloadedStream::OnInputStreamReady(nsIAsyncInputStream* aStream) {
  nsCOMPtr<nsIInputStreamCallback> callback;
  {
    auto lock = mCallback.Lock();
    callback = lock->forget();
  }
  if (callback) {
    return callback->OnInputStreamReady(this);
  }
  return NS_OK;
}

}  // namespace net
}  // namespace mozilla

quality96%

¤ Dauer der Verarbeitung: 0.11 Sekunden (vorverarbeitet) ¤

Wurzel

Suchen

Beweissystem der NASA

Beweissystem Isabelle

NIST Cobol Testsuite

Cephes Mathematical Library

Wiener Entwicklungsmethode

Haftungshinweis

Die Informationen auf dieser Webseite wurden nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit, noch Qualität der bereit gestellten Informationen zugesichert.

Bemerkung:

Die farbliche Syntaxdarstellung ist noch experimentell.