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433 lines
11 KiB
C++
433 lines
11 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/* vim:set ts=4 sts=4 sw=4 cin et: */
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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 "nsStreamUtils.h"
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#include "nsReadableUtils.h"
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#include "nsISeekableStream.h"
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#include "nsISupportsPrimitives.h"
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#include "nsInt64.h"
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#include "nsCRT.h"
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#include "prerror.h"
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#include "plstr.h"
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#include "nsIClassInfoImpl.h"
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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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, public nsISupportsCString
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{
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public:
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NS_DECL_ISUPPORTS
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NS_DECL_NSIINPUTSTREAM
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NS_DECL_NSISTRINGINPUTSTREAM
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NS_DECL_NSISEEKABLESTREAM
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NS_DECL_NSISUPPORTSPRIMITIVE
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NS_DECL_NSISUPPORTSCSTRING
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nsStringInputStream()
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: mData(nsnull)
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, mOffset(0)
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, mLength(0)
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, mOwned(PR_FALSE)
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{}
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private:
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~nsStringInputStream()
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{
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if (mData)
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Clear();
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}
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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(mData || !mOwned, "bad state");
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if (mOwned)
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NS_Free(NS_CONST_CAST(char*, mData));
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// We're about to get a new string; reset the offset.
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mOffset = 0;
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}
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const char* mData;
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PRUint32 mOffset;
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PRUint32 mLength;
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PRPackedBool mOwned;
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};
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// This class needs to support threadsafe refcounting since people often
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// allocate a string stream, and then read it from a background thread.
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NS_IMPL_THREADSAFE_ADDREF(nsStringInputStream)
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NS_IMPL_THREADSAFE_RELEASE(nsStringInputStream)
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NS_IMPL_QUERY_INTERFACE4_CI(nsStringInputStream,
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nsIStringInputStream,
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nsIInputStream,
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nsISupportsCString,
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nsISeekableStream)
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NS_IMPL_CI_INTERFACE_GETTER4(nsStringInputStream,
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nsIStringInputStream,
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nsIInputStream,
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nsISupportsCString,
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nsISeekableStream)
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/////////
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// nsISupportsCString implementation
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/////////
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NS_IMETHODIMP
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nsStringInputStream::GetType(PRUint16 *type)
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{
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*type = TYPE_CSTRING;
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return NS_OK;
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}
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NS_IMETHODIMP
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nsStringInputStream::GetData(nsACString &data)
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{
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// The stream doesn't have any data when it is closed. We could fake it
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// and return an empty string here, but it seems better to keep this return
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// value consistent with the behavior of the other 'getter' methods.
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NS_ENSURE_TRUE(mData, NS_BASE_STREAM_CLOSED);
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data.Assign(mData, mLength);
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return NS_OK;
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}
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NS_IMETHODIMP
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nsStringInputStream::SetData(const nsACString &data)
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{
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nsACString::const_iterator iter;
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data.BeginReading(iter);
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return SetData(iter.get(), iter.size_forward());
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}
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NS_IMETHODIMP
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nsStringInputStream::ToString(char **result)
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{
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// NOTE: This method may result in data loss, so we do not implement it.
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return NS_ERROR_NOT_IMPLEMENTED;
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}
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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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// NOTE: We do not use nsCRT::strndup here because that does not handle
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// null bytes in the middle of the given data.
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char *copy = NS_STATIC_CAST(char *, NS_Alloc(dataLen));
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if (!copy)
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return NS_ERROR_OUT_OF_MEMORY;
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memcpy(copy, data, dataLen);
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return AdoptData(copy, 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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mData = 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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mData = 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
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nsStringInputStream::Close()
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{
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Clear();
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mData = nsnull;
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mLength = 0;
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mOwned = PR_FALSE;
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return NS_OK;
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}
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NS_IMETHODIMP
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nsStringInputStream::Available(PRUint32 *aLength)
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{
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NS_ASSERTION(aLength, "null ptr");
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if (!mData)
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return NS_BASE_STREAM_CLOSED;
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*aLength = LengthRemaining();
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return NS_OK;
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}
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NS_IMETHODIMP
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nsStringInputStream::Read(char* aBuf, PRUint32 aCount, PRUint32 *aReadCount)
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{
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NS_ASSERTION(aBuf, "null ptr");
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return ReadSegments(NS_CopySegmentToBuffer, aBuf, aCount, aReadCount);
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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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NS_ASSERTION(result, "null ptr");
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NS_ASSERTION(mLength >= mOffset, "bad stream state");
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// We may be at end-of-file
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PRUint32 maxCount = LengthRemaining();
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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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NS_ASSERTION(mData, "must have data if maxCount != 0");
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if (aCount > maxCount)
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aCount = maxCount;
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nsresult rv = writer(this, closure, mData + mOffset, 0, aCount, result);
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if (NS_SUCCEEDED(rv)) {
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NS_ASSERTION(*result <= aCount,
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"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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if (!mData)
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return NS_BASE_STREAM_CLOSED;
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// Compute new stream position. The given offset may be a negative value.
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PRInt64 newPos = offset;
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switch (whence) {
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case NS_SEEK_SET:
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break;
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case NS_SEEK_CUR:
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newPos += (PRInt32) mOffset;
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break;
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case NS_SEEK_END:
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newPos += (PRInt32) mLength;
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break;
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default:
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NS_ERROR("invalid whence");
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return NS_ERROR_INVALID_ARG;
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}
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// mLength is never larger than PR_INT32_MAX due to the way it is assigned.
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NS_ENSURE_ARG(newPos >= 0);
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NS_ENSURE_ARG(newPos <= (PRInt32) mLength);
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mOffset = (PRInt32) newPos;
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return NS_OK;
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}
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NS_IMETHODIMP
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nsStringInputStream::Tell(PRInt64* outWhere)
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{
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if (!mData)
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return NS_BASE_STREAM_CLOSED;
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*outWhere = mOffset;
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return NS_OK;
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}
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NS_IMETHODIMP
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nsStringInputStream::SetEOF()
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{
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if (!mData)
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return NS_BASE_STREAM_CLOSED;
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mLength = mOffset;
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return NS_OK;
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}
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NS_COM nsresult
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NS_NewByteInputStream(nsIInputStream** aStreamResult,
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const char* aStringToRead, PRInt32 aLength,
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nsAssignmentType aAssignment)
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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;
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switch (aAssignment) {
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case NS_ASSIGNMENT_COPY:
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rv = stream->SetData(aStringToRead, aLength);
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break;
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case NS_ASSIGNMENT_DEPEND:
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rv = stream->ShareData(aStringToRead, aLength);
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break;
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case NS_ASSIGNMENT_ADOPT:
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rv = stream->AdoptData(NS_CONST_CAST(char*, aStringToRead), aLength);
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break;
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default:
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NS_ERROR("invalid assignment type");
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rv = NS_ERROR_INVALID_ARG;
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}
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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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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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char* data = ToNewCString(aStringToRead); // truncates high-order bytes
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if (!data)
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return NS_ERROR_OUT_OF_MEMORY;
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nsresult rv = NS_NewByteInputStream(aStreamResult, data,
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aStringToRead.Length(),
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NS_ASSIGNMENT_ADOPT);
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if (NS_FAILED(rv))
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NS_Free(data);
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return rv;
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}
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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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nsACString::const_iterator data;
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aStringToRead.BeginReading(data);
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return NS_NewByteInputStream(aStreamResult, data.get(), data.size_forward(),
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NS_ASSIGNMENT_COPY);
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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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NS_ENSURE_TRUE(!outer, NS_ERROR_NO_AGGREGATION);
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nsStringInputStream *inst = new 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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