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