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Minimal test - lines (17, 35)

Code

class InputStreamCallback final : public nsIInputStreamCallback {
  nsCOMPtr mStream;
  nsCOMPtr mCallback;

 public:
  NS_DECL_THREADSAFE_ISUPPORTS

  InputStreamCallback(nsIAsyncInputStream* aStream,
                      nsIInputStreamCallback* aCallback)
      : mStream(aStream), mCallback(aCallback) {}

  NS_IMETHOD
  OnInputStreamReady(nsIAsyncInputStream* aStream) override {
    return mCallback->OnInputStreamReady(mStream);
  }

 private:
  ~InputStreamCallback() = default;
};

Minimal test - lines (141, 158)

Code

TEST(TestSlicedInputStream, Simple)
{
  const size_t kBufSize = 4096;

  nsCString buf;
  RefPtr sis =
      CreateSeekableStreams(kBufSize, 0, kBufSize, buf);

  uint64_t length;
  ASSERT_EQ(NS_OK, sis->Available(&length));
  ASSERT_EQ((uint64_t)kBufSize, length);

  char buf2[kBufSize];
  uint32_t count;
  ASSERT_EQ(NS_OK, sis->Read(buf2, sizeof(buf2), &count));
  ASSERT_EQ(count, buf.Length());
  ASSERT_TRUE(nsCString(buf.get()).Equals(nsCString(buf2)));
}

Minimal test - lines (112, 123)

Code

static SlicedInputStream* CreateSeekableStreams(uint32_t aSize, uint64_t aStart,
                                                uint64_t aLength,
                                                nsCString& aBuffer) {
  aBuffer.SetLength(aSize);
  for (uint32_t i = 0; i < aSize; ++i) {
    aBuffer.BeginWriting()[i] = i % 10;
  }

  nsCOMPtr stream;
  NS_NewCStringInputStream(getter_AddRefs(stream), aBuffer);
  return new SlicedInputStream(stream.forget(), aStart, aLength);
}

Minimal test - lines (44, 107)

Code

class NonSeekableStringStream final : public nsIAsyncInputStream {
  nsCOMPtr mStream;

 public:
  NS_DECL_THREADSAFE_ISUPPORTS

  explicit NonSeekableStringStream(const nsACString& aBuffer) {
    NS_NewCStringInputStream(getter_AddRefs(mStream), aBuffer);
  }

  explicit NonSeekableStringStream(nsIInputStream* aStream)
      : mStream(aStream) {}

  NS_IMETHOD
  Available(uint64_t* aLength) override { return mStream->Available(aLength); }

  NS_IMETHOD
  Read(char* aBuffer, uint32_t aCount, uint32_t* aReadCount) override {
    return mStream->Read(aBuffer, aCount, aReadCount);
  }

  NS_IMETHOD
  ReadSegments(nsWriteSegmentFun aWriter, void* aClosure, uint32_t aCount,
               uint32_t* aResult) override {
    return mStream->ReadSegments(aWriter, aClosure, aCount, aResult);
  }

  NS_IMETHOD
  Close() override { return mStream->Close(); }

  NS_IMETHOD
  IsNonBlocking(bool* aNonBlocking) override {
    return mStream->IsNonBlocking(aNonBlocking);
  }

  NS_IMETHOD
  CloseWithStatus(nsresult aStatus) override {
    nsCOMPtr async = do_QueryInterface(mStream);
    if (!async) {
      MOZ_CRASH("This should not happen.");
      return NS_ERROR_FAILURE;
    }

    return async->CloseWithStatus(aStatus);
  }

  NS_IMETHOD
  AsyncWait(nsIInputStreamCallback* aCallback, uint32_t aFlags,
            uint32_t aRequestedCount, nsIEventTarget* aEventTarget) override {
    nsCOMPtr async = do_QueryInterface(mStream);
    if (!async) {
      MOZ_CRASH("This should not happen.");
      return NS_ERROR_FAILURE;
    }

    RefPtr callback =
        new InputStreamCallback(this, aCallback);

    return async->AsyncWait(callback, aFlags, aRequestedCount, aEventTarget);
  }

 private:
  ~NonSeekableStringStream() = default;
};

Minimal test - lines (161, 177)

Code

TEST(TestSlicedInputStream, Sliced)
{
  const size_t kBufSize = 4096;

  nsCString buf;
  RefPtr sis = CreateSeekableStreams(kBufSize, 10, 100, buf);

  uint64_t length;
  ASSERT_EQ(NS_OK, sis->Available(&length));
  ASSERT_EQ((uint64_t)100, length);

  char buf2[kBufSize / 2];
  uint32_t count;
  ASSERT_EQ(NS_OK, sis->Read(buf2, sizeof(buf2), &count));
  ASSERT_EQ((uint64_t)100, count);
  ASSERT_TRUE(nsCString(buf.get() + 10, count).Equals(nsCString(buf2, count)));
}

Minimal test - lines (127, 138)

Code

static SlicedInputStream* CreateNonSeekableStreams(uint32_t aSize,
                                                   uint64_t aStart,
                                                   uint64_t aLength,
                                                   nsCString& aBuffer) {
  aBuffer.SetLength(aSize);
  for (uint32_t i = 0; i < aSize; ++i) {
    aBuffer.BeginWriting()[i] = i % 10;
  }

  RefPtr stream = new NonSeekableStringStream(aBuffer);
  return new SlicedInputStream(stream.forget(), aStart, aLength);
}