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gecko-dev/netwerk/streamconv/converters/nsHTTPCompressConv.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: NPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Netscape 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/NPL/
*
* 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) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* 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 NPL, 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 NPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "nsHTTPCompressConv.h"
#include "nsMemory.h"
#include "plstr.h"
#include "prlog.h"
#include "nsIChannel.h"
#include "nsCOMPtr.h"
#include "nsReadableUtils.h"
#include "nsIByteArrayInputStream.h"
#include "nsIStringStream.h"
// nsISupports implementation
NS_IMPL_THREADSAFE_ISUPPORTS2 (nsHTTPCompressConv, nsIStreamConverter, nsIStreamListener);
// nsFTPDirListingConv methods
nsHTTPCompressConv::nsHTTPCompressConv ()
: mListener (nsnull),
mMode (HTTP_COMPRESS_IDENTITY),
mOutBuffer (NULL), mInpBuffer (NULL),
mOutBufferLen (0), mInpBufferLen (0),
mCheckHeaderDone (PR_FALSE),
mGzipStreamEnded (PR_FALSE), mGzipStreamInitialized (PR_FALSE),
mLen (0), hMode (0), mSkipCount (0), mFlags (0)
{
}
nsHTTPCompressConv::~nsHTTPCompressConv ()
{
NS_IF_RELEASE(mListener);
if (mInpBuffer != NULL)
nsMemory::Free (mInpBuffer);
if (mOutBuffer != NULL)
nsMemory::Free (mOutBuffer);
}
NS_IMETHODIMP
nsHTTPCompressConv::AsyncConvertData (
const PRUnichar *aFromType,
const PRUnichar *aToType,
nsIStreamListener *aListener,
nsISupports *aCtxt)
{
nsString from (aFromType);
nsString to ( aToType );
char * fromStr = ToNewCString(from);
char * toStr = ToNewCString(to);
if (!PL_strncasecmp (fromStr, HTTP_COMPRESS_TYPE , strlen (HTTP_COMPRESS_TYPE ))
||
!PL_strncasecmp (fromStr, HTTP_X_COMPRESS_TYPE, strlen (HTTP_X_COMPRESS_TYPE)))
mMode = HTTP_COMPRESS_COMPRESS;
else
if (!PL_strncasecmp (fromStr, HTTP_GZIP_TYPE , strlen (HTTP_COMPRESS_TYPE))
||
!PL_strncasecmp (fromStr, HTTP_X_GZIP_TYPE , strlen (HTTP_X_GZIP_TYPE)))
mMode = HTTP_COMPRESS_GZIP;
else
if (!PL_strncasecmp (fromStr, HTTP_DEFLATE_TYPE, strlen (HTTP_DEFLATE_TYPE)))
mMode = HTTP_COMPRESS_DEFLATE;
nsMemory::Free (fromStr);
nsMemory::Free ( toStr);
// hook ourself up with the receiving listener.
mListener = aListener;
NS_ADDREF (mListener);
mAsyncConvContext = aCtxt;
return NS_OK;
}
NS_IMETHODIMP
nsHTTPCompressConv::OnStartRequest (nsIRequest* request, nsISupports *aContext)
{
return mListener->OnStartRequest (request, aContext);
}
NS_IMETHODIMP
nsHTTPCompressConv::OnStopRequest(nsIRequest* request, nsISupports *aContext,
nsresult aStatus)
{
return mListener->OnStopRequest(request, aContext, aStatus);
}
NS_IMETHODIMP
nsHTTPCompressConv::OnDataAvailable (
nsIRequest* request,
nsISupports *aContext,
nsIInputStream *iStr,
PRUint32 aSourceOffset,
PRUint32 aCount)
{
nsresult rv = NS_ERROR_FAILURE;
PRUint32 streamLen;
rv = iStr->Available (&streamLen);
if (NS_FAILED (rv))
return rv;
if (streamLen == 0 || mGzipStreamEnded)
return NS_OK;
switch (mMode)
{
case HTTP_COMPRESS_GZIP :
streamLen = check_header (iStr, streamLen, &rv);
if (rv != NS_OK)
return rv;
if (streamLen == 0)
return NS_OK;
case HTTP_COMPRESS_COMPRESS:
case HTTP_COMPRESS_DEFLATE :
if (mInpBuffer != NULL && streamLen > mInpBufferLen)
{
mInpBuffer = (unsigned char *) nsMemory::Realloc (mInpBuffer, mInpBufferLen = streamLen);
if (mOutBufferLen < streamLen * 2)
mOutBuffer = (unsigned char *) nsMemory::Realloc (mOutBuffer, mOutBufferLen = streamLen * 3);
if (mInpBuffer == NULL || mOutBuffer == NULL)
return NS_ERROR_OUT_OF_MEMORY;
}
if (mInpBuffer == NULL)
mInpBuffer = (unsigned char *) nsMemory::Alloc (mInpBufferLen = streamLen);
if (mOutBuffer == NULL)
mOutBuffer = (unsigned char *) nsMemory::Alloc (mOutBufferLen = streamLen * 3);
if (mInpBuffer == NULL || mOutBuffer == NULL)
return NS_ERROR_OUT_OF_MEMORY;
iStr->Read ((char *)mInpBuffer, streamLen, &rv);
if (NS_FAILED (rv))
return rv;
if (mMode == HTTP_COMPRESS_COMPRESS)
{
unsigned long uLen = mOutBufferLen;
int code = uncompress (mOutBuffer, &uLen, mInpBuffer, mInpBufferLen);
if (code == Z_BUF_ERROR)
{
mOutBuffer = (unsigned char *) nsMemory::Realloc (mOutBuffer, mOutBufferLen *= 3);
if (mOutBuffer == NULL)
return NS_ERROR_OUT_OF_MEMORY;
code = uncompress (mOutBuffer, &uLen, mInpBuffer, mInpBufferLen);
}
if (code != Z_OK)
return NS_ERROR_FAILURE;
rv = do_OnDataAvailable (request, aContext, aSourceOffset, (char *)mOutBuffer, (PRUint32) uLen);
if (NS_FAILED (rv))
return rv;
}
else
{
if (!mGzipStreamInitialized)
{
memset (&d_stream, 0, sizeof (d_stream));
if (inflateInit2 (&d_stream, -MAX_WBITS) != Z_OK)
return NS_ERROR_FAILURE;
mGzipStreamInitialized = PR_TRUE;
}
d_stream.next_in = mInpBuffer;
d_stream.avail_in = (uInt)streamLen;
for ( ; ; )
{
d_stream.next_out = mOutBuffer;
d_stream.avail_out = (uInt)mOutBufferLen;
int code = inflate (&d_stream, Z_NO_FLUSH);
unsigned bytesWritten = (uInt)mOutBufferLen - d_stream.avail_out;
if (code == Z_STREAM_END)
{
if (bytesWritten)
{
rv = do_OnDataAvailable (request, aContext, aSourceOffset, (char *)mOutBuffer, bytesWritten);
if (NS_FAILED (rv))
return rv;
}
inflateEnd (&d_stream);
mGzipStreamEnded = PR_TRUE;
break;
}
else
if (code == Z_OK)
{
if (bytesWritten)
{
rv = do_OnDataAvailable (request, aContext, aSourceOffset, (char *)mOutBuffer, bytesWritten);
if (NS_FAILED (rv))
return rv;
}
}
else
if (code == Z_BUF_ERROR)
{
if (bytesWritten)
{
rv = do_OnDataAvailable (request, aContext, aSourceOffset, (char *)mOutBuffer, bytesWritten);
if (NS_FAILED (rv))
return rv;
}
break;
}
else
return NS_ERROR_FAILURE;
} /* for */
} /* gzip */
break;
default:
rv = mListener->OnDataAvailable (request, aContext, iStr, aSourceOffset, aCount);
if (NS_FAILED (rv))
return rv;
} /* switch */
return NS_OK;
} /* OnDataAvailable */
// XXX/ruslan: need to implement this too
NS_IMETHODIMP
nsHTTPCompressConv::Convert (
nsIInputStream *aFromStream,
const PRUnichar *aFromType,
const PRUnichar *aToType,
nsISupports *aCtxt,
nsIInputStream **_retval)
{
return NS_ERROR_NOT_IMPLEMENTED;
}
nsresult
nsHTTPCompressConv::do_OnDataAvailable (nsIRequest* request, nsISupports *aContext, PRUint32 aSourceOffset, char *buffer, PRUint32 aCount)
{
nsresult rv;
nsCOMPtr<nsIByteArrayInputStream> convertedStreamSup;
char * lBuf = (char *) nsMemory::Alloc (aCount);
if (lBuf == NULL)
return NS_ERROR_OUT_OF_MEMORY;
memcpy (lBuf, buffer, aCount);
rv = NS_NewByteArrayInputStream (getter_AddRefs(convertedStreamSup), lBuf, aCount);
if (NS_FAILED (rv))
return rv;
nsCOMPtr<nsIInputStream> convertedStream = do_QueryInterface (convertedStreamSup, &rv);
if (NS_FAILED (rv))
return rv;
rv = mListener->OnDataAvailable (request, aContext, convertedStream, aSourceOffset, aCount);
return rv;
}
#define ASCII_FLAG 0x01 /* bit 0 set: file probably ascii text */
#define HEAD_CRC 0x02 /* bit 1 set: header CRC present */
#define EXTRA_FIELD 0x04 /* bit 2 set: extra field present */
#define ORIG_NAME 0x08 /* bit 3 set: original file name present */
#define COMMENT 0x10 /* bit 4 set: file comment present */
#define RESERVED 0xE0 /* bits 5..7: reserved */
static unsigned gz_magic[2] = {0x1f, 0x8b}; /* gzip magic header */
PRUint32
nsHTTPCompressConv::check_header (nsIInputStream *iStr, PRUint32 streamLen, nsresult *rs)
{
nsresult rv;
enum { GZIP_INIT = 0, GZIP_OS, GZIP_EXTRA0, GZIP_EXTRA1, GZIP_EXTRA2, GZIP_ORIG, GZIP_COMMENT, GZIP_CRC };
char c;
*rs = NS_OK;
if (mCheckHeaderDone)
return streamLen;
while (streamLen)
{
switch (hMode)
{
case GZIP_INIT:
iStr->Read (&c, 1, &rv);
streamLen--;
if (mSkipCount == 0 && ((unsigned)c & 0377) != gz_magic[0])
{
*rs = NS_ERROR_FAILURE;
return 0;
}
if (mSkipCount == 1 && ((unsigned)c & 0377) != gz_magic[1])
{
*rs = NS_ERROR_FAILURE;
return 0;
}
if (mSkipCount == 2 && ((unsigned)c & 0377) != Z_DEFLATED)
{
*rs = NS_ERROR_FAILURE;
return 0;
}
mSkipCount++;
if (mSkipCount == 4)
{
mFlags = (unsigned) c & 0377;
if (mFlags & RESERVED)
{
*rs = NS_ERROR_FAILURE;
return 0;
}
hMode = GZIP_OS;
mSkipCount = 0;
}
break;
case GZIP_OS :
iStr->Read (&c, 1, &rv);
streamLen--;
mSkipCount++;
if (mSkipCount == 6)
hMode = GZIP_EXTRA0;
break;
case GZIP_EXTRA0:
if (mFlags & EXTRA_FIELD)
{
iStr->Read (&c, 1, &rv);
streamLen--;
mLen = (uInt) c & 0377;
hMode = GZIP_EXTRA1;
}
else
hMode = GZIP_ORIG;
break;
case GZIP_EXTRA1:
iStr->Read (&c, 1, &rv);
streamLen--;
mLen = ((uInt) c & 0377) << 8;
mSkipCount = 0;
hMode = GZIP_EXTRA2;
break;
case GZIP_EXTRA2:
if (mSkipCount == mLen)
hMode = GZIP_ORIG;
else
{
iStr->Read (&c, 1, &rv);
streamLen--;
mSkipCount++;
}
break;
case GZIP_ORIG:
if (mFlags & ORIG_NAME)
{
iStr->Read (&c, 1, &rv);
streamLen--;
if (c == 0)
hMode = GZIP_COMMENT;
}
else
hMode = GZIP_COMMENT;
break;
case GZIP_COMMENT:
if (mFlags & GZIP_COMMENT)
{
iStr->Read (&c, 1, &rv);
streamLen--;
if (c == 0)
{
hMode = GZIP_CRC;
mSkipCount = 0;
}
}
else
{
hMode = GZIP_CRC;
mSkipCount = 0;
}
break;
case GZIP_CRC:
if (mFlags & HEAD_CRC)
{
iStr->Read (&c, 1, &rv);
streamLen--;
mSkipCount++;
if (mSkipCount == 2)
{
mCheckHeaderDone = PR_TRUE;
return streamLen;
}
}
else
{
mCheckHeaderDone = PR_TRUE;
return streamLen;
}
break;
}
}
return streamLen;
}
nsresult
NS_NewHTTPCompressConv (nsHTTPCompressConv ** aHTTPCompressConv)
{
NS_PRECONDITION(aHTTPCompressConv != nsnull, "null ptr");
if (! aHTTPCompressConv)
return NS_ERROR_NULL_POINTER;
*aHTTPCompressConv = new nsHTTPCompressConv ();
if (! *aHTTPCompressConv)
return NS_ERROR_OUT_OF_MEMORY;
NS_ADDREF(*aHTTPCompressConv);
return NS_OK;
}
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