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103 lines
3.6 KiB
C++
103 lines
3.6 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Netscape Public License
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* Version 1.0 (the "NPL"); you may not use this file except in
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* compliance with the NPL. You may obtain a copy of the NPL at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the NPL is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
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* for the specific language governing rights and limitations under the
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* NPL.
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*
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* The Initial Developer of this code under the NPL is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All Rights
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* Reserved.
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*/
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#include "nsFileSpecStreaming.h"
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#include "nsIInputStream.h"
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#include "nsIOutputStream.h"
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#include "nsFileStream.h"
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#include "nsFileSpec.h"
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#define MAX_PERSISTENT_DATA_SIZE 1000
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//----------------------------------------------------------------------------------------
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nsOutputStream& operator << (nsOutputStream& s, const nsFileURL& url)
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//----------------------------------------------------------------------------------------
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{
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return s << url.GetAsString();
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}
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//----------------------------------------------------------------------------------------
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nsresult ReadDescriptor(
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nsIInputStream* aStream,
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nsPersistentFileDescriptor& desc)
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//----------------------------------------------------------------------------------------
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{
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nsInputStream inputStream(aStream);
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inputStream >> desc;
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return NS_OK;
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}
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//----------------------------------------------------------------------------------------
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nsresult WriteDescriptor(
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nsIOutputStream* aStream,
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const nsPersistentFileDescriptor& desc)
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//----------------------------------------------------------------------------------------
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{
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nsOutputStream outputStream(aStream);
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outputStream << desc;
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return NS_OK;
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}
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//----------------------------------------------------------------------------------------
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nsInputStream& operator >> (nsInputStream& s, nsPersistentFileDescriptor& d)
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// reads the data from a file
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//----------------------------------------------------------------------------------------
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{
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char bigBuffer[MAX_PERSISTENT_DATA_SIZE + 1];
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// The first 8 bytes of the data should be a hex version of the data size to follow.
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PRInt32 bytesRead = 8;
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bytesRead = s.read(bigBuffer, bytesRead);
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if (bytesRead != 8)
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return s;
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bigBuffer[8] = '\0';
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sscanf(bigBuffer, "%x", (PRUint32*)&bytesRead);
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if (bytesRead > MAX_PERSISTENT_DATA_SIZE)
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{
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// Try to tolerate encoded values with no length header
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bytesRead = 8 + s.read(bigBuffer + 8, MAX_PERSISTENT_DATA_SIZE - 8);
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}
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else
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{
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// Now we know how many bytes to read, do it.
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bytesRead = s.read(bigBuffer, bytesRead);
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}
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// Make sure we are null terminated
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bigBuffer[bytesRead]='\0';
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d.SetData(bigBuffer, bytesRead);
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return s;
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}
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//----------------------------------------------------------------------------------------
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nsOutputStream& operator << (nsOutputStream& s, const nsPersistentFileDescriptor& d)
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// writes the data to a file
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//----------------------------------------------------------------------------------------
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{
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char littleBuf[9];
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PRInt32 dataSize;
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nsSimpleCharString data;
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d.GetData(data, dataSize);
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// First write (in hex) the length of the data to follow. Exactly 8 bytes
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sprintf(littleBuf, "%.8x", dataSize);
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s << littleBuf;
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// Now write the data itself
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s << (const char*)data;
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return s;
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}
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