mirror of
https://github.com/rn10950/RetroZilla.git
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439 lines
12 KiB
C++
439 lines
12 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/* ***** 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.org code.
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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) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* mcmullen@netscape.com (original author)
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* warren@netscape.com
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* alecf@netscape.com
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* scc@mozilla.org
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* david.gardiner@unisa.edu.au
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* fur@netscape.com
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* norris@netscape.com
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* pinkerton@netscape.com
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* davidm@netscape.com
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* sfraser@netscape.com
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* darin@netscape.com
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* bzbarsky@mit.edu
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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 of the GNU General Public License Version 2 or later (the "GPL"),
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* or 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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/**
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* Based on original code from nsIStringStream.cpp
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*/
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#include "nsStringStream.h"
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#include "prerror.h"
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#include "plstr.h"
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#include "nsReadableUtils.h"
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#include "nsCRT.h"
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#include "nsISeekableStream.h"
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#include "nsInt64.h"
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#define NS_FILE_RESULT(x) ns_file_convert_result((PRInt32)x)
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#define NS_FILE_FAILURE NS_FILE_RESULT(-1)
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static nsresult ns_file_convert_result(PRInt32 nativeErr)
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{
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return nativeErr ?
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NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_FILES,((nativeErr)&0xFFFF))
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: NS_OK;
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}
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//-----------------------------------------------------------------------------
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// nsIStringInputStream implementation
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//-----------------------------------------------------------------------------
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class nsStringInputStream : public nsIStringInputStream
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, public nsISeekableStream
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{
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public:
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nsStringInputStream()
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: mOffset(0)
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, mLastResult(NS_OK)
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, mEOF(PR_FALSE)
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, mOwned(PR_FALSE)
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, mConstString(nsnull)
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, mLength(0)
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{}
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private:
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~nsStringInputStream()
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{
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if (mOwned)
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nsMemory::Free((char*)mConstString);
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}
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public:
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NS_DECL_ISUPPORTS
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NS_DECL_NSISTRINGINPUTSTREAM
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NS_DECL_NSIINPUTSTREAM
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NS_DECL_NSISEEKABLESTREAM
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protected:
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PRInt32 LengthRemaining() const
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{
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return mLength - mOffset;
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}
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void Clear()
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{
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NS_ASSERTION(mConstString || !mOwned,
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"Can't have mOwned set and have a null string!");
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if (mOwned)
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nsMemory::Free((char*)mConstString);
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// We're about to get a new string; clear the members that
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// would no longer have valid values.
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mOffset = 0;
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mLastResult = NS_OK;
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mEOF = PR_FALSE;
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}
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PRUint32 mOffset;
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nsresult mLastResult;
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PRPackedBool mEOF;
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PRPackedBool mOwned;
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const char* mConstString;
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PRUint32 mLength;
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};
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NS_IMPL_THREADSAFE_ISUPPORTS3(nsStringInputStream,
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nsIStringInputStream,
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nsIInputStream,
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nsISeekableStream)
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/////////
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// nsIStringInputStream implementation
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/////////
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NS_IMETHODIMP
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nsStringInputStream::SetData(const char *data, PRInt32 dataLen)
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{
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NS_ENSURE_ARG_POINTER(data);
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if (dataLen < 0)
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dataLen = strlen(data);
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return AdoptData(nsCRT::strndup(data, dataLen), dataLen);
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}
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NS_IMETHODIMP
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nsStringInputStream::AdoptData(char *data, PRInt32 dataLen)
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{
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NS_ENSURE_ARG_POINTER(data);
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if (dataLen < 0)
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dataLen = strlen(data);
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Clear();
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mConstString = (const char *) data;
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mLength = dataLen;
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mOwned = PR_TRUE;
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return NS_OK;
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}
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NS_IMETHODIMP
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nsStringInputStream::ShareData(const char *data, PRInt32 dataLen)
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{
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NS_ENSURE_ARG_POINTER(data);
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if (dataLen < 0)
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dataLen = strlen(data);
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Clear();
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mConstString = data;
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mLength = dataLen;
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mOwned = PR_FALSE;
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return NS_OK;
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}
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/////////
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// nsIInputStream implementation
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/////////
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NS_IMETHODIMP nsStringInputStream::Close()
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{
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return NS_OK;
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}
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NS_IMETHODIMP nsStringInputStream::Available(PRUint32 *aLength)
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{
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NS_PRECONDITION(aLength != nsnull, "null ptr");
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if (!aLength)
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return NS_ERROR_NULL_POINTER;
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*aLength = LengthRemaining();
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return NS_OK;
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}
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NS_IMETHODIMP nsStringInputStream::Read(char* aBuf, PRUint32 aCount,
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PRUint32 *aReadCount)
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{
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NS_PRECONDITION(aBuf != nsnull, "null ptr");
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if (!aBuf)
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return NS_ERROR_NULL_POINTER;
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NS_PRECONDITION(aReadCount != nsnull, "null ptr");
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if (!aReadCount)
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return NS_ERROR_NULL_POINTER;
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if (NS_FAILED(mLastResult))
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return mLastResult;
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PRUint32 bytesRead;
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PRUint32 maxCount = mLength - mOffset;
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if (aCount > maxCount)
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bytesRead = maxCount;
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else
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bytesRead = aCount;
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memcpy(aBuf, mConstString + mOffset, bytesRead);
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mOffset += bytesRead;
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*aReadCount = bytesRead;
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return NS_OK;
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}
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NS_IMETHODIMP
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nsStringInputStream::ReadSegments(nsWriteSegmentFun writer, void * closure,
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PRUint32 aCount, PRUint32 * result)
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{
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nsresult rv;
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PRUint32 maxCount = mLength - mOffset;
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if (maxCount == 0) {
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*result = 0;
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return NS_OK;
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}
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if (aCount > maxCount)
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aCount = maxCount;
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rv = writer(this, closure, mConstString + mOffset,
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0, aCount, result);
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if (NS_SUCCEEDED(rv)) {
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NS_ASSERTION(*result <= aCount, "writer should not write more than we asked it to write");
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mOffset += *result;
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}
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// errors returned from the writer end here!
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return NS_OK;
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}
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NS_IMETHODIMP
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nsStringInputStream::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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/////////
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// nsISeekableStream implementation
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/////////
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NS_IMETHODIMP
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nsStringInputStream::Seek(PRInt32 whence, PRInt64 offset)
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{
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mLastResult = NS_OK; // reset on a seek.
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const nsInt64 maxUint32 = PR_UINT32_MAX;
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nsInt64 offset64(offset);
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PRInt32 offset32;
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LL_L2I(offset32, offset);
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NS_ASSERTION(maxUint32 > offset64, "string streams only support 32 bit offsets");
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mEOF = PR_FALSE; // reset on a seek.
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PRInt32 fileSize = LengthRemaining();
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PRInt32 newPosition=-1;
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switch (whence)
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{
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case NS_SEEK_CUR: newPosition = mOffset + offset32; break;
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case NS_SEEK_SET: newPosition = offset32; break;
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case NS_SEEK_END: newPosition = fileSize + offset32; break;
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}
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if (newPosition < 0)
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{
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newPosition = 0;
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mLastResult = NS_FILE_RESULT(PR_FILE_SEEK_ERROR);
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}
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if (newPosition >= fileSize)
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{
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newPosition = fileSize;
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mEOF = PR_TRUE;
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}
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mOffset = newPosition;
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return NS_OK;
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}
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NS_IMETHODIMP nsStringInputStream::Tell(PRInt64* outWhere)
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{
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*outWhere = mOffset;
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return NS_OK;
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}
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NS_IMETHODIMP nsStringInputStream::SetEOF()
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{
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NS_NOTYETIMPLEMENTED("nsStringInputStream::SetEOF");
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return NS_ERROR_NOT_IMPLEMENTED;
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}
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// Factory method to get an nsInputStream from an nsAString. Result will
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// implement nsIStringInputStream and nsISeekableStream
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extern "C" NS_COM nsresult
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NS_NewStringInputStream(nsIInputStream** aStreamResult,
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const nsAString& aStringToRead)
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{
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NS_PRECONDITION(aStreamResult, "null out ptr");
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char* data = ToNewCString(aStringToRead);
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if (!data)
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return NS_ERROR_OUT_OF_MEMORY;
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nsStringInputStream* stream = new nsStringInputStream();
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if (! stream) {
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nsMemory::Free(data);
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return NS_ERROR_OUT_OF_MEMORY;
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}
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NS_ADDREF(stream);
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nsresult rv = stream->AdoptData(data, aStringToRead.Length());
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if (NS_FAILED(rv)) {
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nsMemory::Free(data);
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NS_RELEASE(stream);
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return rv;
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}
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*aStreamResult = stream;
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return NS_OK;
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}
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// Factory method to get an nsInputStream from an nsACString. Result will
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// implement nsIStringInputStream and nsISeekableStream
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extern "C" NS_COM nsresult
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NS_NewCStringInputStream(nsIInputStream** aStreamResult,
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const nsACString& aStringToRead)
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{
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NS_PRECONDITION(aStreamResult, "null out ptr");
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char* data = ToNewCString(aStringToRead);
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if (!data)
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return NS_ERROR_OUT_OF_MEMORY;
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nsStringInputStream* stream = new nsStringInputStream();
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if (! stream) {
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nsMemory::Free(data);
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return NS_ERROR_OUT_OF_MEMORY;
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}
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NS_ADDREF(stream);
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nsresult rv = stream->AdoptData(data, aStringToRead.Length());
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if (NS_FAILED(rv)) {
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nsMemory::Free(data);
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NS_RELEASE(stream);
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return rv;
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}
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*aStreamResult = stream;
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return NS_OK;
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}
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// Factory method to get an nsInputStream from a C string. Result will
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// implement nsIStringInputStream and nsISeekableStream
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extern "C" NS_COM nsresult
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NS_NewCharInputStream(nsIInputStream** aStreamResult,
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const char* aStringToRead)
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{
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NS_PRECONDITION(aStreamResult, "null out ptr");
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nsStringInputStream* stream = new nsStringInputStream();
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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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nsresult rv = stream->ShareData(aStringToRead, -1);
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if (NS_FAILED(rv)) {
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NS_RELEASE(stream);
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return rv;
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}
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*aStreamResult = stream;
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return NS_OK;
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}
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// Factory method to get an nsInputStream from a byte array. Result will
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// implement nsIStringInputStream and nsISeekableStream
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extern "C" NS_COM nsresult
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NS_NewByteInputStream(nsIInputStream** aStreamResult,
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const char* aStringToRead,
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PRInt32 aLength)
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{
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NS_PRECONDITION(aStreamResult, "null out ptr");
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nsStringInputStream* stream = new nsStringInputStream();
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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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nsresult rv = stream->ShareData(aStringToRead, aLength);
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if (NS_FAILED(rv)) {
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NS_RELEASE(stream);
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return rv;
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}
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*aStreamResult = stream;
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return NS_OK;
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}
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// factory method for constructing a nsStringInputStream object
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NS_METHOD
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nsStringInputStreamConstructor(nsISupports *outer, REFNSIID iid, void **result)
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{
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*result = nsnull;
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if (outer)
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return NS_ERROR_NO_AGGREGATION;
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nsStringInputStream *inst;
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NS_NEWXPCOM(inst, nsStringInputStream);
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if (!inst)
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return NS_ERROR_OUT_OF_MEMORY;
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NS_ADDREF(inst);
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nsresult rv = inst->QueryInterface(iid, result);
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NS_RELEASE(inst);
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return rv;
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}
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