/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ /* 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/. */ #ifndef SlicedInputStream_h #define SlicedInputStream_h #include "mozilla/Attributes.h" #include "nsCOMPtr.h" #include "nsIAsyncInputStream.h" #include "nsICloneableInputStream.h" // A wrapper for a slice of an underlying input stream. class SlicedInputStream final : public nsIAsyncInputStream , public nsICloneableInputStream { public: NS_DECL_THREADSAFE_ISUPPORTS NS_DECL_NSIINPUTSTREAM NS_DECL_NSICLONEABLEINPUTSTREAM NS_DECL_NSIASYNCINPUTSTREAM // Create an input stream whose data comes from a slice of aInputStream. The // slice begins at aStart bytes beyond aInputStream's current position, and // extends for a maximum of aLength bytes. If aInputStream contains fewer // than aStart bytes, reading from SlicedInputStream returns no data. If // aInputStream contains more than aStart bytes, but fewer than aStart + // aLength bytes, reading from SlicedInputStream returns as many bytes as can // be consumed from aInputStream after reading aLength bytes. // // aInputStream should not be read from after constructing a // SlicedInputStream wrapper around it. SlicedInputStream(nsIInputStream* aInputStream, uint64_t aStart, uint64_t aLength); private: ~SlicedInputStream(); nsCOMPtr<nsIInputStream> mInputStream; uint64_t mStart; uint64_t mLength; uint64_t mCurPos; bool mClosed; }; #endif // SlicedInputStream_h