mirror of
https://github.com/classilla/tenfourfox.git
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121 lines
4.3 KiB
C++
121 lines
4.3 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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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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uint32_t type, creator;
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uint16_t flags;
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int32_t 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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uint32_t 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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int16_t GetNextChar(uint32_t numBytesInBuffer);
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nsresult ProcessNextChunk(nsIRequest * aRequest, nsISupports * aContext, uint32_t 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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int16_t mState; /* current state */
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uint16_t mCRC; /* cumulative CRC */
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uint16_t mFileCRC; /* CRC value from file */
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longbuf mOctetBuf; /* buffer for decoded 6-bit values */
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int16_t mOctetin; /* current input position in octetbuf */
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int16_t mDonePos; /* ending position in octetbuf */
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int16_t 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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uint32_t mPosInDataBuffer;
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unsigned char mRlebuf; /* buffer for last run length encoding value */
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uint32_t mCount; /* generic counter */
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int16_t mMarker; /* flag indicating maker */
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int32_t mPosInbuff; /* the index of the inbuff. */
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int32_t mPosOutputBuff; /* the position of the out buff. */
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};
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#endif /* nsBinHexDecoder_h__ */
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