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pjs/netwerk/streamconv/converters/nsBinHexDecoder.cpp

544 строки
16 KiB
C++
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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1999
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Scott MacGregor <mscott@netscape.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "nsBinHexDecoder.h"
#include "nsIServiceManager.h"
#include "nsIStreamConverterService.h"
#include "nsCRT.h"
#include "nsIPipe.h"
#include "nsMimeTypes.h"
#include "netCore.h"
#include "nsXPIDLString.h"
#include "prnetdb.h"
#include "nsIURI.h"
#include "nsIURL.h"
#include "nsIMIMEService.h"
#include "nsMimeTypes.h"
#define DATA_BUFFER_SIZE (4096*2)
#define NS_STREAM_CONVERTER_SEGMENT_SIZE (4*1024)
#define NS_STREAM_CONVERTER_BUFFER_SIZE (32*1024)
// sadly I couldn't find char defintions for CR LF elsehwere in the code (they are defined as strings in nsCRT.h)
#define CR '\015'
#define LF '\012'
nsBinHexDecoder::nsBinHexDecoder() :
mState(0), mCRC(0), mFileCRC(0), mOctetin(26),
mDonePos(3), mInCRC(0), mCount(0), mMarker(0), mPosInbuff(0),
mPosOutputBuff(0)
{
mDataBuffer = nsnull;
mOutgoingBuffer = nsnull;
mOctetBuf.val = 0;
mHeader.type = 0;
mHeader.creator = 0;
mHeader.flags = 0;
mHeader.dlen = 0;
mHeader.rlen = 0;
}
nsBinHexDecoder::~nsBinHexDecoder()
{
if (mDataBuffer)
nsMemory::Free(mDataBuffer);
if (mOutgoingBuffer)
nsMemory::Free(mOutgoingBuffer);
}
NS_IMPL_ADDREF(nsBinHexDecoder)
NS_IMPL_RELEASE(nsBinHexDecoder)
NS_INTERFACE_MAP_BEGIN(nsBinHexDecoder)
NS_INTERFACE_MAP_ENTRY(nsIStreamConverter)
NS_INTERFACE_MAP_ENTRY(nsIStreamListener)
NS_INTERFACE_MAP_ENTRY(nsIRequestObserver)
NS_INTERFACE_MAP_ENTRY(nsISupports)
NS_INTERFACE_MAP_END
// The binhex 4.0 decoder table....
static char binhex_decode[256] =
{
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, -1, -1,
13, 14, 15, 16, 17, 18, 19, -1, 20, 21, -1, -1, -1, -1, -1, -1,
22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, -1,
37, 38, 39, 40, 41, 42, 43, -1, 44, 45, 46, 47, -1, -1, -1, -1,
48, 49, 50, 51, 52, 53, 54, -1, 55, 56, 57, 58, 59, 60, -1, -1,
61, 62, 63, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
};
#define BHEXVAL(c) (binhex_decode[(unsigned char) c])
//////////////////////////////////////////////////////
// nsIStreamConverter methods...
//////////////////////////////////////////////////////
NS_IMETHODIMP
nsBinHexDecoder::Convert(nsIInputStream *aFromStream,
const char *aFromType,
const char *aToType,
nsISupports *aCtxt,
nsIInputStream **aResultStream)
{
return NS_ERROR_NOT_IMPLEMENTED;
}
NS_IMETHODIMP
nsBinHexDecoder::AsyncConvertData(const char *aFromType,
const char *aToType,
nsIStreamListener *aListener,
nsISupports *aCtxt)
{
NS_ASSERTION(aListener && aFromType && aToType,
"null pointer passed into bin hex converter");
// hook up our final listener. this guy gets the various On*() calls we want to throw
// at him.
//
mNextListener = aListener;
return (aListener) ? NS_OK : NS_ERROR_FAILURE;
}
//////////////////////////////////////////////////////
// nsIStreamListener methods...
//////////////////////////////////////////////////////
NS_IMETHODIMP
nsBinHexDecoder::OnDataAvailable(nsIRequest* request,
nsISupports *aCtxt,
nsIInputStream *aStream,
PRUint32 aSourceOffset,
PRUint32 aCount)
{
nsresult rv = NS_OK;
if (mOutputStream && mDataBuffer && aCount > 0)
{
PRUint32 numBytesRead = 0;
while (aCount > 0) // while we still have bytes to copy...
{
aStream->Read(mDataBuffer, PR_MIN(aCount, DATA_BUFFER_SIZE - 1), &numBytesRead);
if (aCount >= numBytesRead)
aCount -= numBytesRead; // subtract off the number of bytes we just read
else
aCount = 0;
// Process this new chunk of bin hex data...
ProcessNextChunk(request, aCtxt, numBytesRead);
}
}
return rv;
}
nsresult nsBinHexDecoder::ProcessNextState(nsIRequest * aRequest, nsISupports * aContext)
{
nsresult status = NS_OK;
PRUint16 tmpcrc, cval;
unsigned char ctmp, c = mRlebuf;
/* do CRC */
ctmp = mInCRC ? c : 0;
cval = mCRC & 0xf000;
tmpcrc = ((PRUint16) (mCRC << 4) | (ctmp >> 4)) ^ (cval | (cval >> 7) | (cval >> 12));
cval = tmpcrc & 0xf000;
mCRC = ((PRUint16) (tmpcrc << 4) | (ctmp & 0x0f)) ^ (cval | (cval >> 7) | (cval >> 12));
/* handle state */
switch (mState)
{
case BINHEX_STATE_START:
mState = BINHEX_STATE_FNAME;
mCount = 1;
// c & 63 returns the length of mName. So if we need the length, that's how
// you can figure it out...for now we are storing it in the first byte of mName
*(mName) = (c & 63);
break;
case BINHEX_STATE_FNAME:
mName[mCount] = c;
if (mCount++ > *(mName)) // the first byte of mName is the length...
{
// okay we've figured out the file name....set the content type on the channel
// based on the file name AND issue our delayed on start request....
// be sure to skip the first byte of mName which is the size of the file name
SetContentType(aRequest, &mName[1]);
// now propagate the on start request
mNextListener->OnStartRequest(aRequest, aContext);
mState = BINHEX_STATE_HEADER;
mCount = 0;
}
break;
case BINHEX_STATE_HEADER:
((char *) &mHeader)[mCount] = c;
if (++mCount == 18)
{
if (sizeof(binhex_header) != 18) /* fix an alignment problem in some OSes */
{
char *p = (char *)&mHeader;
p += 19;
for (c = 0; c < 8; c++)
{
*p = *(p-2); p--;
}
}
mState = BINHEX_STATE_HCRC;
mInCRC = 1;
mCount = 0;
}
break;
case BINHEX_STATE_DFORK:
case BINHEX_STATE_RFORK:
mOutgoingBuffer[mPosOutputBuff++] = c;
if (-- mCount == 0)
{
/* only output data fork in the non-mac system. */
if (mState == BINHEX_STATE_DFORK)
{
PRUint32 numBytesWritten = 0;
mOutputStream->Write(mOutgoingBuffer, mPosOutputBuff, &numBytesWritten);
if (PRInt32(numBytesWritten) != mPosOutputBuff)
status = NS_ERROR_FAILURE;
// now propagate the data we just wrote
mNextListener->OnDataAvailable(aRequest, aContext, mInputStream, 0, numBytesWritten);
}
else
status = NS_OK; /* do nothing for resource fork. */
mPosOutputBuff = 0;
if (status != NS_OK)
mState = BINHEX_STATE_DONE;
else
mState ++;
mInCRC = 1;
}
else if (mPosOutputBuff >= DATA_BUFFER_SIZE)
{
if (mState == BINHEX_STATE_DFORK)
{
PRUint32 numBytesWritten = 0;
mOutputStream->Write(mOutgoingBuffer, mPosOutputBuff, &numBytesWritten);
if (PRInt32(numBytesWritten) != mPosOutputBuff)
status = NS_ERROR_FAILURE;
mNextListener->OnDataAvailable(aRequest, aContext, mInputStream, 0, numBytesWritten);
mPosOutputBuff = 0;
}
}
break;
case BINHEX_STATE_HCRC:
case BINHEX_STATE_DCRC:
case BINHEX_STATE_RCRC:
if (!mCount++)
mFileCRC = (unsigned short) c << 8;
else
{
if ((mFileCRC | c) != mCRC)
{
mState = BINHEX_STATE_DONE;
break;
}
/* passed the CRC check!!!*/
mCRC = 0;
if (++ mState == BINHEX_STATE_FINISH)
{
// when we reach the finished state...fire an on stop request on the event listener...
mNextListener->OnStopRequest(aRequest, aContext, NS_OK);
mNextListener = 0;
/* now We are done with everything. */
mState++;
break;
}
if (mState == BINHEX_STATE_DFORK)
mCount = PR_ntohl(mHeader.dlen);
else
{
// we aren't processing the resurce Fork. uncomment this line if we make this converter
// smart enough to do this in the future.
// mCount = PR_ntohl(mHeader.rlen); /* it should in host byte order */
mCount = 0;
}
if (mCount)
mInCRC = 0;
else
/* nothing inside, so skip to the next state. */
mState ++;
}
break;
}
return NS_OK;
}
nsresult nsBinHexDecoder::ProcessNextChunk(nsIRequest * aRequest, nsISupports * aContext, PRUint32 numBytesInBuffer)
{
PRBool foundStart;
PRInt16 octetpos, c = 0;
PRUint32 val;
mPosInDataBuffer = 0; // use member variable.
NS_ENSURE_TRUE(numBytesInBuffer > 0, NS_ERROR_FAILURE);
// if it is the first time, seek to the right start place.
if (mState == BINHEX_STATE_START)
{
foundStart = PR_FALSE;
// go through the line, until we get a ':'
while (mPosInDataBuffer < numBytesInBuffer)
{
c = mDataBuffer[mPosInDataBuffer++];
while (c == CR || c == LF)
{
if (mPosInDataBuffer >= numBytesInBuffer)
break;
c = mDataBuffer[mPosInDataBuffer++];
if (c == ':')
{
foundStart = PR_TRUE;
break;
}
}
if (foundStart) break; /* we got the start point. */
}
if (mPosInDataBuffer >= numBytesInBuffer)
return NS_OK; /* we meet buff end before we get the start point, wait till next fills. */
if (c != ':')
return NS_ERROR_FAILURE; /* can't find the start character. */
}
while (mState != BINHEX_STATE_DONE)
{
/* fill in octetbuf */
do
{
if (mPosInDataBuffer >= numBytesInBuffer)
return NS_OK; /* end of buff, go on for the nxet calls. */
c = GetNextChar(numBytesInBuffer);
if (c == 0) return NS_OK;
if ((val = BHEXVAL(c)) == PRUint32(-1))
{
/* we incount an invalid character. */
if (c)
{
/* rolling back. */
mDonePos --;
if (mOctetin >= 14) mDonePos--;
if (mOctetin >= 20) mDonePos--;
}
break;
}
mOctetBuf.val |= val << mOctetin;
}
while ((mOctetin -= 6) > 2);
/* handle decoded characters -- run length encoding (rle) detection */
// We put decoded chars into mOctetBuf.val in order from high to low (via
// bitshifting, above). But we want to byte-address them, so we want the
// first byte to correspond to the high byte. In other words, we want
// these bytes to be in network order.
mOctetBuf.val = PR_htonl(mOctetBuf.val);
for (octetpos = 0; octetpos < mDonePos; ++octetpos)
{
c = mOctetBuf.c[octetpos];
if (c == 0x90 && !mMarker++)
continue;
if (mMarker)
{
if (c == 0)
{
mRlebuf = 0x90;
ProcessNextState(aRequest, aContext);
}
else
{
while (--c > 0) /* we are in the run lenght mode */
ProcessNextState(aRequest, aContext);
}
mMarker = 0;
}
else
{
mRlebuf = (unsigned char) c;
ProcessNextState(aRequest, aContext);
}
if (mState >= BINHEX_STATE_DONE)
break;
}
/* prepare for next 3 characters. */
if (mDonePos < 3 && mState < BINHEX_STATE_DONE)
mState = BINHEX_STATE_DONE;
mOctetin = 26;
mOctetBuf.val = 0;
}
return NS_OK;
}
PRInt16 nsBinHexDecoder::GetNextChar(PRUint32 numBytesInBuffer)
{
char c = 0;
while (mPosInDataBuffer < numBytesInBuffer)
{
c = mDataBuffer[mPosInDataBuffer++];
if (c != LF && c != CR)
break;
}
return (c == LF || c == CR) ? 0 : (int) c;
}
//////////////////////////////////////////////////////
// nsIRequestObserver methods...
//////////////////////////////////////////////////////
NS_IMETHODIMP
nsBinHexDecoder::OnStartRequest(nsIRequest* request, nsISupports *aCtxt)
{
nsresult rv = NS_OK;
NS_ENSURE_TRUE(mNextListener, NS_ERROR_FAILURE);
mDataBuffer = (char *) nsMemory::Alloc((sizeof(char) * DATA_BUFFER_SIZE));
mOutgoingBuffer = (char *) nsMemory::Alloc((sizeof(char) * DATA_BUFFER_SIZE));
if (!mDataBuffer || !mOutgoingBuffer) return NS_ERROR_FAILURE; // out of memory;
// now we want to create a pipe which we'll use to write our converted data...
rv = NS_NewPipe(getter_AddRefs(mInputStream), getter_AddRefs(mOutputStream),
NS_STREAM_CONVERTER_SEGMENT_SIZE,
NS_STREAM_CONVERTER_BUFFER_SIZE,
PR_TRUE, PR_TRUE);
// don't propagate the on start request to mNextListener until we have determined the content type.
return rv;
}
// Given the fileName we discovered inside the bin hex decoding, figure out the
// content type and set it on the channel associated with the request. If the
// filename tells us nothing useful, just report an unknown type and let the
// unknown decoder handle things.
nsresult nsBinHexDecoder::SetContentType(nsIRequest* aRequest,
const char * fileName)
{
if (!fileName || !*fileName) {
// Nothing to do here.
return NS_OK;
}
nsresult rv;
nsCOMPtr<nsIChannel> channel(do_QueryInterface(aRequest, &rv));
NS_ENSURE_SUCCESS(rv, rv);
nsCOMPtr<nsIMIMEService> mimeService(do_GetService("@mozilla.org/mime;1", &rv));
NS_ENSURE_SUCCESS(rv, rv);
nsCAutoString contentType;
// extract the extension from fileName and look it up.
const char * fileExt = strrchr(fileName, '.');
if (!fileExt) {
return NS_OK;
}
mimeService->GetTypeFromExtension(nsDependentCString(fileExt), contentType);
// Only set the type if it's not empty and, to prevent recursive loops, not the binhex type
if (!contentType.IsEmpty() && !contentType.Equals(APPLICATION_BINHEX)) {
channel->SetContentType(contentType);
} else {
channel->SetContentType(NS_LITERAL_CSTRING(UNKNOWN_CONTENT_TYPE));
}
return NS_OK;
}
NS_IMETHODIMP
nsBinHexDecoder::OnStopRequest(nsIRequest* request, nsISupports *aCtxt,
nsresult aStatus)
{
nsresult rv = NS_OK;
if (!mNextListener) return NS_ERROR_FAILURE;
// don't do anything here...we'll fire our own on stop request when we are done
// processing the data....
return rv;
}
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