mirror of
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230 lines
9.4 KiB
C++
230 lines
9.4 KiB
C++
/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 2002
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Darin Fisher <darin@netscape.com>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef nsStreamUtils_h__
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#define nsStreamUtils_h__
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#include "nsStringFwd.h"
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#include "nsIInputStream.h"
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class nsIOutputStream;
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class nsIInputStreamCallback;
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class nsIOutputStreamCallback;
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class nsIEventTarget;
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/**
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* A "one-shot" proxy of the OnInputStreamReady callback. The resulting
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* proxy object's OnInputStreamReady function may only be called once! The
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* proxy object ensures that the real notify object will be free'd on the
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* thread corresponding to the given event target regardless of what thread
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* the proxy object is destroyed on.
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*
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* This function is designed to be used to implement AsyncWait when the
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* aEventTarget parameter is non-null.
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*/
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extern NS_COM nsresult
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NS_NewInputStreamReadyEvent(nsIInputStreamCallback **aEvent,
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nsIInputStreamCallback *aNotify,
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nsIEventTarget *aEventTarget);
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/**
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* A "one-shot" proxy of the OnOutputStreamReady callback. The resulting
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* proxy object's OnOutputStreamReady function may only be called once! The
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* proxy object ensures that the real notify object will be free'd on the
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* thread corresponding to the given event target regardless of what thread
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* the proxy object is destroyed on.
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*
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* This function is designed to be used to implement AsyncWait when the
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* aEventTarget parameter is non-null.
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*/
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extern NS_COM nsresult
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NS_NewOutputStreamReadyEvent(nsIOutputStreamCallback **aEvent,
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nsIOutputStreamCallback *aNotify,
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nsIEventTarget *aEventTarget);
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/* ------------------------------------------------------------------------- */
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enum nsAsyncCopyMode {
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NS_ASYNCCOPY_VIA_READSEGMENTS,
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NS_ASYNCCOPY_VIA_WRITESEGMENTS
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};
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/**
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* This function is called when the async copy process completes. The reported
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* status is NS_OK on success and some error code on failure.
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*/
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typedef void (* nsAsyncCopyCallbackFun)(void *closure, nsresult status);
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/**
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* This function asynchronously copies data from the source to the sink. All
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* data transfer occurs on the thread corresponding to the given event target.
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* A null event target is not permitted.
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*
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* The copier handles blocking or non-blocking streams transparently. If a
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* stream operation returns NS_BASE_STREAM_WOULD_BLOCK, then the stream will
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* be QI'd to nsIAsync{In,Out}putStream and its AsyncWait method will be used
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* to determine when to resume copying.
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*/
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extern NS_COM nsresult
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NS_AsyncCopy(nsIInputStream *aSource,
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nsIOutputStream *aSink,
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nsIEventTarget *aEventTarget,
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nsAsyncCopyMode aMode = NS_ASYNCCOPY_VIA_READSEGMENTS,
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PRUint32 aChunkSize = 4096,
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nsAsyncCopyCallbackFun aCallbackFun = nsnull,
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void *aCallbackClosure = nsnull);
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/**
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* This function copies all of the available data from the stream (up to at
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* most aMaxCount bytes) into the given buffer. The buffer is truncated at
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* the start of the function.
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*
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* If an error occurs while reading from the stream or while attempting to
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* resize the buffer, then the corresponding error code is returned from this
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* function, and any data that has already been read will be returned in the
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* output buffer. This allows one to use this function with a non-blocking
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* input stream that may return NS_BASE_STREAM_WOULD_BLOCK if it only has
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* partial data available.
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*
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* @param aSource
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* The input stream to read.
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* @param aMaxCount
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* The maximum number of bytes to consume from the stream. Pass the
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* value PR_UINT32_MAX to consume the entire stream. The number of
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* bytes actually read is given by the length of aBuffer upon return.
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* @param aBuffer
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* The string object that will contain the stream data upon return.
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* Note: The data copied to the string may contain null bytes and may
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* contain non-ASCII values.
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*/
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extern NS_COM nsresult
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NS_ConsumeStream(nsIInputStream *aSource, PRUint32 aMaxCount,
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nsACString &aBuffer);
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/**
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* This function tests whether or not the input stream is buffered. A buffered
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* input stream is one that implements readSegments. The test for this is to
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* simply call readSegments, without actually consuming any data from the
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* stream, to verify that it functions.
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*
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* NOTE: If the stream is non-blocking and has no data available yet, then this
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* test will fail. In that case, we return false even though the test is not
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* really conclusive.
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*
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* @param aInputStream
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* The input stream to test.
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*/
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extern NS_COM PRBool
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NS_InputStreamIsBuffered(nsIInputStream *aInputStream);
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/**
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* This function tests whether or not the output stream is buffered. A
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* buffered output stream is one that implements writeSegments. The test for
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* this is to simply call writeSegments, without actually writing any data into
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* the stream, to verify that it functions.
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*
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* NOTE: If the stream is non-blocking and has no available space yet, then
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* this test will fail. In that case, we return false even though the test is
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* not really conclusive.
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*
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* @param aOutputStream
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* The output stream to test.
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*/
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extern NS_COM PRBool
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NS_OutputStreamIsBuffered(nsIOutputStream *aOutputStream);
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/**
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* This function is intended to be passed to nsIInputStream::ReadSegments to
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* copy data from the nsIInputStream into a nsIOutputStream passed as the
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* aClosure parameter to the ReadSegments function.
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*
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* @see nsIInputStream.idl for a description of this function's parameters.
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*/
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extern NS_COM NS_METHOD
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NS_CopySegmentToStream(nsIInputStream *aInputStream, void *aClosure,
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const char *aFromSegment, PRUint32 aToOffset,
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PRUint32 aCount, PRUint32 *aWriteCount);
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/**
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* This function is intended to be passed to nsIInputStream::ReadSegments to
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* copy data from the nsIInputStream into a character buffer passed as the
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* aClosure parameter to the ReadSegments function. The character buffer
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* must be at least as large as the aCount parameter passed to ReadSegments.
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*
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* @see nsIInputStream.idl for a description of this function's parameters.
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*/
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extern NS_COM NS_METHOD
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NS_CopySegmentToBuffer(nsIInputStream *aInputStream, void *aClosure,
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const char *aFromSegment, PRUint32 aToOffset,
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PRUint32 aCount, PRUint32 *aWriteCount);
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/**
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* This function is intended to be passed to nsIInputStream::ReadSegments to
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* discard data from the nsIInputStream. This can be used to efficiently read
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* data from the stream without actually copying any bytes.
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*
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* @see nsIInputStream.idl for a description of this function's parameters.
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*/
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extern NS_COM NS_METHOD
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NS_DiscardSegment(nsIInputStream *aInputStream, void *aClosure,
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const char *aFromSegment, PRUint32 aToOffset,
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PRUint32 aCount, PRUint32 *aWriteCount);
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/**
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* This function is intended to be passed to nsIInputStream::ReadSegments to
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* adjust the aInputStream parameter passed to a consumer's WriteSegmentFun.
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* The aClosure parameter must be a pointer to a nsWriteSegmentThunk object.
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* The mStream and mClosure members of that object will be passed to the mFun
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* function, with the remainder of the parameters being what are passed to
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* NS_WriteSegmentThunk.
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*
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* This function comes in handy when implementing ReadSegments in terms of an
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* inner stream's ReadSegments.
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*/
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extern NS_COM NS_METHOD
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NS_WriteSegmentThunk(nsIInputStream *aInputStream, void *aClosure,
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const char *aFromSegment, PRUint32 aToOffset,
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PRUint32 aCount, PRUint32 *aWriteCount);
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struct nsWriteSegmentThunk {
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nsIInputStream *mStream;
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nsWriteSegmentFun mFun;
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void *mClosure;
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};
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#endif // !nsStreamUtils_h__
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