зеркало из https://github.com/mozilla/pjs.git
148 строки
3.9 KiB
C++
148 строки
3.9 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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* The contents of this file are subject to the Netscape Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the License.
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*
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* The Original Code is Mozilla Communicator client code, released
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* March 31, 1998.
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*
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* The Initial Developer of the Original Code is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998-1999 Netscape Communications Corporation. All
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* Rights Reserved.
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*
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*/
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#include "nsByteArrayInputStream.h"
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#include "nsMemory.h"
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NS_IMPL_THREADSAFE_ISUPPORTS2(nsByteArrayInputStream, nsIInputStream, nsIByteArrayInputStream)
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nsByteArrayInputStream::nsByteArrayInputStream (char *buffer, PRUint32 bytes)
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: _buffer (buffer), _nbytes (bytes), _pos (0)
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{
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}
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nsByteArrayInputStream::~nsByteArrayInputStream ()
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{
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if (_buffer != NULL)
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nsMemory::Free (_buffer);
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}
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NS_IMETHODIMP
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nsByteArrayInputStream::Available (PRUint32* aResult)
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{
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if (aResult == NULL)
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return NS_ERROR_NULL_POINTER;
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if (_nbytes == 0 || _buffer == NULL)
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*aResult = 0;
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else
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*aResult = _nbytes - _pos;
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return NS_OK;
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}
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NS_IMETHODIMP
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nsByteArrayInputStream::Read (char* aBuffer, PRUint32 aCount, PRUint32 *aNumRead)
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{
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if (aBuffer == NULL || aNumRead == NULL)
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return NS_ERROR_NULL_POINTER;
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if (_nbytes == 0)
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return NS_ERROR_FAILURE;
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if (aCount == 0 || _pos == _nbytes)
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*aNumRead = 0;
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else
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{
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NS_ASSERTION (_buffer != NULL, "Stream buffer has been released - there's an ownership problem somewhere!");
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if (_buffer == NULL)
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*aNumRead = 0;
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else
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if (aCount > _nbytes - _pos)
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{
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memcpy (aBuffer, &_buffer[_pos], *aNumRead = _nbytes - _pos);
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_pos = _nbytes;
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}
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else
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{
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memcpy (aBuffer, &_buffer[_pos], *aNumRead = aCount);
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_pos += aCount;
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}
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}
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return NS_OK;
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}
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NS_IMETHODIMP
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nsByteArrayInputStream::ReadSegments(nsWriteSegmentFun writer, void * aClosure, PRUint32 aCount, PRUint32 *aNumRead)
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{
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if (aNumRead == NULL)
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return NS_ERROR_NULL_POINTER;
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if (_nbytes == 0)
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return NS_ERROR_FAILURE;
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if (aCount == 0 || _pos == _nbytes)
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*aNumRead = 0;
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else {
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NS_ASSERTION (_buffer != NULL, "Stream buffer has been released - there's an ownership problem somewhere!");
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PRUint32 readCount = PR_MIN(aCount, (_nbytes - _pos));
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if (_buffer == NULL)
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*aNumRead = 0;
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else {
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nsresult rv = writer (this, aClosure, &_buffer[_pos],
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_pos, readCount, aNumRead);
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if (NS_SUCCEEDED(rv))
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_pos += *aNumRead;
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}
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}
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// do not propogate errors returned from writer!
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return NS_OK;
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}
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NS_IMETHODIMP
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nsByteArrayInputStream::IsNonBlocking(PRBool *aNonBlocking)
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{
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*aNonBlocking = PR_TRUE;
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return NS_OK;
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}
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NS_IMETHODIMP
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nsByteArrayInputStream::Close ()
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{
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if (_buffer != NULL)
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{
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nsMemory::Free (_buffer);
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_buffer = NULL;
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_nbytes = 0;
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}
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else
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return NS_ERROR_FAILURE;
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return NS_OK;
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}
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NS_COM nsresult
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NS_NewByteArrayInputStream (nsIByteArrayInputStream* *aResult, char * buffer, unsigned long bytes)
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{
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if (aResult == NULL)
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return NS_ERROR_NULL_POINTER;
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nsIByteArrayInputStream * stream = new nsByteArrayInputStream (buffer, bytes);
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if (!stream)
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return NS_ERROR_OUT_OF_MEMORY;
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NS_ADDREF (stream);
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*aResult = stream;
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return NS_OK;
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}
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