зеркало из https://github.com/mozilla/pjs.git
154 строки
5.8 KiB
C++
154 строки
5.8 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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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) 1999
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Scott MacGregor <mscott@netscape.com>
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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 the GNU General Public License Version 2 or later (the "GPL"), or
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* 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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// A decoder for Mac Bin Hex 4.0.
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// This decoder is currently only intended to be used on NON-Mac platforms. It isn't hooked up to
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// code which would actually save the file to disk. As a result, we can't leverage the resource fork.
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// This makes this decoder most unhelpful for the Mac. Our assumption is that if you save a bin hex file
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// on the mac and try to open it, stuffit or some other tool is already going to be on the Mac which knows how
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// to handle bin hex. On windows and unix, that's not the case. We need client code to strip out the data fork.
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// So this decoder currently just strips out the data fork.
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// Note: it's possible that we can eventually turn this decoder into both a decoder and into a file stream (much
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// like the apple double decoder) so on the Mac, if we are saving to disk, we can invoke the decoder as a file stream
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// and it will process the resource fork and do the right magic.
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#ifndef nsBinHexDecoder_h__
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#define nsBinHexDecoder_h__
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#include "nsIStreamConverter.h"
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#include "nsIChannel.h"
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#include "nsIOutputStream.h"
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#include "nsIInputStream.h"
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#include "nsCOMPtr.h"
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#include "nsString.h"
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#define NS_BINHEXDECODER_CID \
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{ /* 301DEA42-6850-4cda-8945-81F7DBC2186B */ \
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0x301dea42, 0x6850, 0x4cda, \
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{ 0x89, 0x45, 0x81, 0xf7, 0xdb, 0xc2, 0x18, 0x6b } \
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}
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typedef struct _binhex_header
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{
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PRUint32 type, creator;
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PRUint16 flags;
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PRInt32 dlen, rlen;
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} binhex_header;
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typedef union
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{
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unsigned char c[4];
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PRUint32 val;
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} longbuf;
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#define BINHEX_STATE_START 0
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#define BINHEX_STATE_FNAME 1
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#define BINHEX_STATE_HEADER 2
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#define BINHEX_STATE_HCRC 3
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#define BINHEX_STATE_DFORK 4
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#define BINHEX_STATE_DCRC 5
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#define BINHEX_STATE_RFORK 6
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#define BINHEX_STATE_RCRC 7
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#define BINHEX_STATE_FINISH 8
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#define BINHEX_STATE_DONE 9
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/* #define BINHEX_STATE_ERROR 10 */
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class nsBinHexDecoder : public nsIStreamConverter
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{
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public:
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// nsISupports methods
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NS_DECL_ISUPPORTS
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// nsIStreamConverter methods
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NS_DECL_NSISTREAMCONVERTER
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// nsIStreamListener methods
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NS_DECL_NSISTREAMLISTENER
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// nsIRequestObserver methods
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NS_DECL_NSIREQUESTOBSERVER
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nsBinHexDecoder();
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protected:
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virtual ~nsBinHexDecoder();
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PRInt16 GetNextChar(PRUint32 numBytesInBuffer);
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nsresult ProcessNextChunk(nsIRequest * aRequest, nsISupports * aContext, PRUint32 numBytesInBuffer);
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nsresult ProcessNextState(nsIRequest * aRequest, nsISupports * aContext);
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nsresult DetectContentType(nsIRequest * aRequest, const nsAFlatCString &aFilename);
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protected:
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nsCOMPtr<nsIStreamListener> mNextListener;
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// the input and output streams form a pipe...they need to be passed around together..
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nsCOMPtr<nsIOutputStream> mOutputStream; // output stream
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nsCOMPtr<nsIInputStream> mInputStream;
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PRInt16 mState; /* current state */
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PRUint16 mCRC; /* cumulative CRC */
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PRUint16 mFileCRC; /* CRC value from file */
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longbuf mOctetBuf; /* buffer for decoded 6-bit values */
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PRInt16 mOctetin; /* current input position in octetbuf */
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PRInt16 mDonePos; /* ending position in octetbuf */
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PRInt16 mInCRC; /* flag set when reading a CRC */
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// Bin Hex Header Information
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binhex_header mHeader;
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nsCString mName; /* fsspec for the output file */
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// unfortunately we are going to need 2 8K buffers here. One for the data we are currently digesting. Another
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// for the outgoing decoded data. I tried getting them to share a buffer but things didn't work out so nicely.
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char * mDataBuffer; // temporary holding pen for the incoming data.
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char * mOutgoingBuffer; // temporary holding pen for the incoming data.
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PRUint32 mPosInDataBuffer;
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unsigned char mRlebuf; /* buffer for last run length encoding value */
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PRUint32 mCount; /* generic counter */
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PRInt16 mMarker; /* flag indicating maker */
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PRInt32 mPosInbuff; /* the index of the inbuff. */
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PRInt32 mPosOutputBuff; /* the position of the out buff. */
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};
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#endif /* nsBinHexDecoder_h__ */
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