nsEnigMimeListener.cpp
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nsEnigMimeListener.cpp
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	/* *** 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 "MPL"); you may not use this file except in
	* compliance with the MPL. You may obtain a copy of the MPL at
	* http://www.mozilla.org/MPL/
	*
	* Software distributed under the MPL is distributed on an "AS IS" basis,
	* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the MPL
	* for the specific language governing rights and limitations under the
	* MPL.
	*
	* The Original Code is Enigmail.
	*
	* The Initial Developer of the Original Code is
	* Ramalingam Saravanan <sarava@sarava.net>
	* Portions created by the Initial Developer are Copyright (C) 2002
	* 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 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 *** */

	// Logging of debug output
	// The following define statement should occur before any include statements
	#define FORCE_PR_LOG /* Allow logging even in release build */

	#include "prlog.h"
	#include "nsCOMPtr.h"
	#include "nsCRT.h"
	#include "nsAutoLock.h"
	#include "nsFileStream.h"
	#include "nsIInputStream.h"
	#include "nsIThread.h"
	#include "nsString.h"
	#include "nsNetUtil.h"
	#include "mimehdrs2.h"
	#include "nsMimeTypes.h"
	#include "nsMailHeaders.h"

	#include "nsEnigMimeListener.h"

	#ifdef PR_LOGGING
	PRLogModuleInfo* gEnigMimeListenerLog = NULL;
	#endif

	#define ERROR_LOG(args) PR_LOG(gEnigMimeListenerLog,PR_LOG_ERROR,args)
	#define WARNING_LOG(args) PR_LOG(gEnigMimeListenerLog,PR_LOG_WARNING,args)
	#define DEBUG_LOG(args) PR_LOG(gEnigMimeListenerLog,PR_LOG_DEBUG,args)

	#define NS_PIPE_CONSOLE_BUFFER_SIZE (1024)

	static const PRUint32 kCharMax = 1024;

	static NS_DEFINE_CID(kIOServiceCID, NS_IOSERVICE_CID);

	#define MK_MIME_ERROR_WRITING_FILE -1

	///////////////////////////////////////////////////////////////////////////////

	// nsEnigMimeListener implementation

	// nsISupports implementation
	NS_IMPL_THREADSAFE_ISUPPORTS4(nsEnigMimeListener,
	nsIEnigMimeListener,
	nsIRequestObserver,
	nsIStreamListener,
	nsIInputStream);


	// nsEnigMimeListener implementation
	nsEnigMimeListener::nsEnigMimeListener()
	: mInitialized(PR_FALSE),
	mRequestStarted(PR_FALSE),
	mSkipHeaders(PR_FALSE),
	mSkipBody(PR_FALSE),

	mContentType(""),
	mContentCharset(""),
	mContentBoundary(""),
	mContentProtocol(""),
	mContentMicalg(""),

	mContentEncoding(""),
	mContentDisposition(""),
	mContentLength(-1),

	mLinebreak(""),
	mHeaders(""),
	mDataStr(""),

	mHeadersFinalCR(PR_FALSE),
	mHeadersLinebreak(2),

	mMaxHeaderBytes(0),
	mDataOffset(0),

	mStreamBuf(nsnull),
	mStreamOffset(0),
	mStreamLength(0),

	mListener(nsnull),
	mContext(nsnull)
	{
	NS_INIT_REFCNT();

	#ifdef PR_LOGGING
	if (gEnigMimeListenerLog == nsnull) {
	gEnigMimeListenerLog = PR_NewLogModule("nsEnigMimeListener");
	}
	#endif

	#ifdef FORCE_PR_LOG
	nsresult rv;
	nsCOMPtr<nsIThread> myThread;
	rv = nsIThread::GetCurrent(getter_AddRefs(myThread));
	DEBUG_LOG(("nsEnigMimeListener:: <<<<<<<<< CTOR(%x): myThread=%x\n",
	(int) this, (int) myThread.get()));
	#endif
	}


	nsEnigMimeListener::~nsEnigMimeListener()
	{
	nsresult rv;
	#ifdef FORCE_PR_LOG
	nsCOMPtr<nsIThread> myThread;
	rv = nsIThread::GetCurrent(getter_AddRefs(myThread));
	DEBUG_LOG(("nsEnigMimeListener:: >>>>>>>>> DTOR(%x): myThread=%x\n",
	(int) this, (int) myThread.get()));
	#endif

	// Release owning refs
	mListener = nsnull;
	mContext = nsnull;
	}


	///////////////////////////////////////////////////////////////////////////////
	// nsIEnigMimeListener methods
	///////////////////////////////////////////////////////////////////////////////

	NS_IMETHODIMP
	nsEnigMimeListener::Init(nsIStreamListener* listener, nsISupports* ctxt,
	PRUint32 maxHeaderBytes, PRBool skipHeaders,
	PRBool skipBody)
	{
	DEBUG_LOG(("nsEnigMimeListener::Init: %d, %d, %d\n", maxHeaderBytes,
	skipHeaders, skipBody));

	if (!listener)
	return NS_ERROR_NULL_POINTER;

	mListener = listener;
	mContext = ctxt;

	mMaxHeaderBytes = maxHeaderBytes;

	mSkipHeaders = skipHeaders;
	mSkipBody = skipBody;

	// There is implicitly a newline preceding the first character
	mHeadersLinebreak = 2;
	mHeadersFinalCR = PR_FALSE;

	mInitialized = PR_TRUE;

	return NS_OK;
	}


	NS_IMETHODIMP
	nsEnigMimeListener::Write(const char* buf, PRUint32 count,
	nsIRequest* aRequest, nsISupports* aContext)
	{
	nsresult rv;

	DEBUG_LOG(("nsEnigMimeListener::Write: %d\n", count));

	mStreamBuf = buf;
	mStreamOffset = 0;
	mStreamLength = count;

	rv = OnDataAvailable(aRequest,
	mContext ? mContext.get() : aContext,
	NS_STATIC_CAST(nsIInputStream*, this),
	0, count);

	Close();

	return rv;
	}

	NS_IMETHODIMP
	nsEnigMimeListener::GetHeaders(nsACString &aHeaders)
	{
	aHeaders = mHeaders;
	DEBUG_LOG(("nsEnigMimeListener::GetHeaders: %d\n", mHeaders.Length()));
	return NS_OK;
	}

	NS_IMETHODIMP
	nsEnigMimeListener::GetLinebreak(nsACString &aLinebreak)
	{
	aLinebreak = mLinebreak;
	DEBUG_LOG(("nsEnigMimeListener::GetLinebreak: %d\n", mLinebreak.Length()));
	return NS_OK;
	}

	NS_IMETHODIMP
	nsEnigMimeListener::GetContentType(nsACString &aContentType)
	{
	aContentType = mContentType;
	DEBUG_LOG(("nsEnigMimeListener::GetContentType: %s\n", mContentType.get()));
	return NS_OK;
	}

	NS_IMETHODIMP
	nsEnigMimeListener::GetContentCharset(nsACString &aContentCharset)
	{
	aContentCharset = mContentCharset;
	DEBUG_LOG(("nsEnigMimeListener::GetContentCharset: %s\n", mContentCharset.get()));
	return NS_OK;
	}

	NS_IMETHODIMP
	nsEnigMimeListener::GetContentBoundary(nsACString &aContentBoundary)
	{
	aContentBoundary = mContentBoundary;
	DEBUG_LOG(("nsEnigMimeListener::GetContentBoundary: %s\n", mContentBoundary.get()));
	return NS_OK;
	}

	NS_IMETHODIMP
	nsEnigMimeListener::GetContentProtocol(nsACString &aContentProtocol)
	{
	aContentProtocol = mContentProtocol;
	DEBUG_LOG(("nsEnigMimeListener::GetContentProtocol: %s\n", mContentProtocol.get()));
	return NS_OK;
	}

	NS_IMETHODIMP
	nsEnigMimeListener::GetContentMicalg(nsACString &aContentMicalg)
	{
	aContentMicalg = mContentMicalg;
	DEBUG_LOG(("nsEnigMimeListener::GetContentMicalg: %s\n", mContentMicalg.get()));
	return NS_OK;
	}

	NS_IMETHODIMP
	nsEnigMimeListener::GetContentEncoding(nsACString &aContentEncoding)
	{
	aContentEncoding = mContentEncoding;
	DEBUG_LOG(("nsEnigMimeListener::GetContentEncoding: %s\n", mContentEncoding.get()));
	return NS_OK;
	}

	NS_IMETHODIMP
	nsEnigMimeListener::GetContentDisposition(nsACString &aContentDisposition)
	{
	aContentDisposition = mContentDisposition;
	DEBUG_LOG(("nsEnigMimeListener::GetContentDisposition: %s\n", mContentDisposition.get()));
	return NS_OK;
	}

	NS_IMETHODIMP
	nsEnigMimeListener::GetContentLength(PRInt32 *aContentLength)
	{
	DEBUG_LOG(("nsEnigMimeListener::GetContentLength: \n"));
	*aContentLength = mContentLength;
	return NS_OK;
	}

	///////////////////////////////////////////////////////////////////////////////
	// nsIRequestObserver methods
	///////////////////////////////////////////////////////////////////////////////

	NS_IMETHODIMP
	nsEnigMimeListener::OnStartRequest(nsIRequest *aRequest,
	nsISupports *aContext)
	{
	DEBUG_LOG(("nsEnigMimeListener::OnStartRequest:\n"));

	if (!mInitialized)
	return NS_ERROR_NOT_INITIALIZED;

	return NS_OK;
	}

	NS_IMETHODIMP
	nsEnigMimeListener::OnStopRequest(nsIRequest* aRequest,
	nsISupports* aContext,
	nsresult aStatus)
	{
	nsresult rv = NS_OK;

	DEBUG_LOG(("nsEnigMimeListener::OnStopRequest:\n"));

	// Ensure that OnStopRequest call chain does not break by failing softly

	if (!mRequestStarted) {

	if (mHeadersFinalCR) {
	// Handle special case of terminating CR with no content
	mHeadersFinalCR = PR_FALSE;

	mLinebreak = "\r";
	mHeaders = mDataStr;

	if (mSkipHeaders) {
	// Skip headers
	mDataStr = "";
	}
	}

	rv = StartRequest(aRequest, aContext);
	if (NS_FAILED(rv))
	aStatus = NS_BINDING_ABORTED;
	}

	if (mListener) {
	rv = mListener->OnStopRequest(aRequest,
	mContext ? mContext.get() : aContext,
	aStatus);
	if (NS_FAILED(rv))
	aStatus = NS_BINDING_ABORTED;
	}

	// Release owning refs
	mListener = nsnull;
	mContext = nsnull;

	return (aStatus == NS_BINDING_ABORTED) ? NS_ERROR_FAILURE : NS_OK;
	}

	///////////////////////////////////////////////////////////////////////////////
	// nsIStreamListener method
	///////////////////////////////////////////////////////////////////////////////

	NS_IMETHODIMP
	nsEnigMimeListener::OnDataAvailable(nsIRequest* aRequest,
	nsISupports* aContext,
	nsIInputStream *aInputStream,
	PRUint32 aSourceOffset,
	PRUint32 aLength)
	{
	nsresult rv = NS_OK;

	DEBUG_LOG(("nsEnigMimeListener::OnDataAVailable: %d\n", aLength));

	if (!mInitialized)
	return NS_ERROR_NOT_INITIALIZED;

	if (!mRequestStarted) {
	PRBool startingRequest = PR_FALSE;

	char buf[kCharMax];
	PRUint32 readCount, readMax;

	while ((aLength > 0) && !startingRequest) {
	readMax = (aLength < kCharMax) ? aLength : kCharMax;
	rv = aInputStream->Read((char *) buf, readMax, &readCount);
	if (NS_FAILED(rv)){
	ERROR_LOG(("nsEnigMimeListener::OnDataAvailable: Error in reading from input stream, %x\n", rv));
	return rv;
	}

	if (readCount <= 0)
	break;

	aLength -= readCount;
	aSourceOffset += readCount;

	startingRequest = HeaderSearch(buf, readCount);
	}

	if (!startingRequest)
	return NS_OK;

	rv = StartRequest(aRequest, aContext);
	if (NS_FAILED(rv))
	return rv;
	}

	if (!mSkipBody && (aLength > 0) && mListener) {
	// Transmit body data unread
	rv = mListener->OnDataAvailable(aRequest,
	mContext ? mContext.get() : aContext,
	aInputStream, mDataOffset, aLength);
	mDataOffset += aLength;

	if (NS_FAILED(rv))
	return rv;
	}

	return NS_OK;
	}


	NS_IMETHODIMP
	nsEnigMimeListener::StartRequest(nsIRequest* aRequest, nsISupports* aContext)
	{
	nsresult rv;

	DEBUG_LOG(("nsEnigMimeListener::StartRequest:\n"));

	if (!mHeaders.IsEmpty()) {
	// Try to parse headers
	ParseMimeHeaders(mHeaders.get(), mHeaders.Length());
	}

	if (mListener) {
	rv = mListener->OnStartRequest(aRequest,
	mContext ? mContext.get() : aContext);
	if (NS_FAILED(rv))
	return rv;
	}

	mRequestStarted = PR_TRUE;

	if (mHeaders.IsEmpty() && mSkipBody) {
	// No headers terminated and skipping body; so discard whatever we have
	mDataStr = "";
	}

	if (!mDataStr.IsEmpty()) {
	// Transmit header/body data already in buffer
	nsCOMPtr<nsIInputStream> inStream;
	rv = NS_NewCStringInputStream(getter_AddRefs(inStream), mDataStr);
	if (NS_FAILED(rv))
	return rv;

	if (mListener) {
	rv = mListener->OnDataAvailable(aRequest,
	mContext ? mContext.get() : aContext,
	inStream, 0, mDataStr.Length());
	if (NS_FAILED(rv))
	return rv;
	}

	mDataOffset += mDataStr.Length();
	mDataStr = "";
	}

	return NS_OK;
	}


	PRBool
	nsEnigMimeListener::HeaderSearch(const char* buf, PRUint32 count)
	{
	DEBUG_LOG(("nsEnigMimeListener::HeaderSearch: count=%d\n", count));

	if (mMaxHeaderBytes <= 0) {
	// Not looking for MIME headers; start request immediately
	return PR_TRUE;
	}

	if (!count)
	return PR_FALSE;

	PRUint32 bytesAvailable = mMaxHeaderBytes - mDataStr.Length();
	NS_ASSERTION(bytesAvailable > 0, "bytesAvailable <= 0");

	PRBool lastSegment = (bytesAvailable <= count);

	PRUint32 scanLen = lastSegment ? bytesAvailable : count;

	PRBool headersFound = PR_FALSE;
	PRUint32 offset = 0;
	PRUint32 j = 0;
	char ch;

	while (j<scanLen) {
	ch = buf[j];

	if (mHeadersFinalCR) {
	// End-of-headers found
	mHeadersFinalCR = PR_FALSE;

	if (ch == '\n') {
	offset = j+1;
	mLinebreak = "\r\n";
	DEBUG_LOG(("nsEnigMimeListener::HeaderSearch: Found final CRLF"));

	} else {
	offset = j;
	mLinebreak = "\r";
	DEBUG_LOG(("nsEnigMimeListener::HeaderSearch: Found final CR"));
	}

	headersFound = PR_TRUE;
	break;

	}

	if (ch == '\n') {

	if (mHeadersLinebreak == 2) {
	// End-of-headers found
	headersFound = PR_TRUE;

	offset = j+1;
	mLinebreak = "\n";
	DEBUG_LOG(("nsEnigMimeListener::HeaderSearch: Found final LF"));
	break;
	}

	mHeadersLinebreak = 2;

	} else if (ch == '\r') {

	if (mHeadersLinebreak > 0) {
	// Final CR
	mHeadersFinalCR = PR_TRUE;
	} else {
	mHeadersLinebreak = 1;
	}

	} else {
	mHeadersLinebreak = 0;
	}

	j++;
	}

	DEBUG_LOG(("nsEnigMimeListener::HeaderSearch: offset=%d\n", offset));

	if (headersFound) {
	// Copy headers out of stream buffer
	if (offset > 0)
	mDataStr.Append(buf, offset);

	mHeaders = mDataStr;

	if (mSkipHeaders) {
	// Skip headers
	mDataStr = "";
	}

	if (!mSkipBody && (offset < count)) {
	// Copy remaining data into stream buffer
	mDataStr.Append(buf+offset, count-offset);
	}

	} else if (!lastSegment) {
	// Save headers data
	mDataStr.Append(buf, count);
	}

	return headersFound \|\| lastSegment;
	}


	void
	nsEnigMimeListener::ParseMimeHeaders(const char* mimeHeaders, PRUint32 count)
	{
	DEBUG_LOG(("nsEnigMimeListener::ParseMimeHeaders, count=%d\n", count));

	// Copy headers string
	nsCAutoString headers(mimeHeaders, count);

	// Replace CRLF with just LF
	headers.ReplaceSubstring("\r\n", "\n");

	// Replace CR with LF (for MAC-style line endings)
	headers.ReplaceChar('\r', '\n');

	// Eliminate all leading whitespace (including linefeeds)
	headers.Trim(" \t\n", PR_TRUE, PR_FALSE);

	if (headers.Length() <= 3) {
	// No headers to parse
	return;
	}

	// Handle continuation of MIME headers, i.e., newline followed by a space
	headers.ReplaceSubstring( "\n ", " ");

	PRUint32 offset = 0;
	while (offset < headers.Length()) {
	PRInt32 lineEnd = headers.FindChar('\n', offset);

	if (lineEnd == kNotFound) {
	// Header line terminator not found
	NS_NOTREACHED("lineEnd == kNotFound");
	return;
	}

	// Normal exit if empty header line
	if (lineEnd == (int)offset)
	break;

	// Parse header line
	ParseHeader((headers.get())+offset, lineEnd - offset);

	offset = lineEnd+1;
	}

	return;
	}

	void
	nsEnigMimeListener::ParseHeader(const char* header, PRUint32 count)
	{

	DEBUG_LOG(("nsEnigMimeListener::ParseHeader, count=%d\n", count));

	if (!header \|\| (count <= 0) )
	return;

	// Create header string
	nsCAutoString headerStr(header, count);

	PRInt32 colonOffset;
	colonOffset = headerStr.FindChar(':');
	if (colonOffset == kNotFound)
	return;

	// Null header key not allowed
	if (colonOffset == 0)
	return;

	// Extract header key (not case-sensitive)
	nsCAutoString headerKey;
	headerStr.Left(headerKey, colonOffset);
	ToLowerCase(headerKey);

	// Extract header value, trimming leading/trailing whitespace
	nsCAutoString buf;
	headerStr.Right(buf, headerStr.Length() - colonOffset - 1);
	buf.Trim(" ");

	DEBUG_LOG(("nsEnigMimeListener::ParseHeader: %s: %s\n",
	headerKey.get(), buf.get()));

	PRInt32 semicolonOffset = buf.FindChar(';');

	nsCAutoString headerValue;
	if (semicolonOffset == kNotFound) {
	// No parameters
	headerValue = buf.get();

	} else {
	// Extract value to left of parameters
	buf.Left(headerValue, semicolonOffset);
	}

	// Trim leading and trailing spaces in header value
	headerValue.Trim(" ");

	if (headerKey.Equals("content-type")) {
	mContentType = headerValue;

	DEBUG_LOG(("nsEnigMimeListener::ParseHeader: ContentType=%s\n",
	mContentType.get()));

	if (!buf.IsEmpty()) {
	char *charset = MimeHeaders_get_parameter(buf.get(),
	HEADER_PARM_CHARSET, NULL, NULL);
	char *boundary = MimeHeaders_get_parameter(buf.get(),
	HEADER_PARM_BOUNDARY, NULL, NULL);
	char *protocol = MimeHeaders_get_parameter(buf.get(),
	PARAM_PROTOCOL, NULL, NULL);
	char *micalg = MimeHeaders_get_parameter(buf.get(),
	PARAM_MICALG, NULL, NULL);

	if (charset)
	mContentCharset = charset;

	if (boundary)
	mContentBoundary = boundary;

	if (protocol)
	mContentProtocol = protocol;

	if (boundary)
	mContentMicalg = micalg;

	PR_FREEIF(charset);
	PR_FREEIF(boundary);
	PR_FREEIF(protocol);
	PR_FREEIF(micalg);

	DEBUG_LOG(("nsEnigMimeListener::ParseHeader: ContentCharset=%s\n",
	mContentCharset.get()));

	DEBUG_LOG(("nsEnigMimeListener::ParseHeader: ContentBoundary=%s\n",
	mContentBoundary.get()));

	DEBUG_LOG(("nsEnigMimeListener::ParseHeader: ContentProtocol=%s\n",
	mContentProtocol.get()));

	DEBUG_LOG(("nsEnigMimeListener::ParseHeader: ContentMicalg=%s\n",
	mContentMicalg.get()));
	}

	} else if (headerKey.Equals("content-transfer-encoding")) {
	mContentEncoding = buf;
	ToLowerCase(mContentEncoding);

	DEBUG_LOG(("nsEnigMimeListener::ParseHeader: ContentEncoding=%s\n",
	mContentEncoding.get()));

	} else if (headerKey.Equals("content-disposition")) {
	mContentDisposition = buf;

	DEBUG_LOG(("nsEnigMimeListener::ParseHeader: ContentDisposition=%s\n",
	mContentDisposition.get()));

	} else if (headerKey.Equals("content-length")) {
	PRInt32 status;
	PRInt32 value = headerValue.ToInteger(&status);

	if (NS_SUCCEEDED((nsresult) status))
	mContentLength = value;

	DEBUG_LOG(("nsEnigMimeListener::ParseHeader: ContenLengtht=%d\n",
	mContentLength));
	}

	return;
	}

	///////////////////////////////////////////////////////////////////////////////
	// nsIInputStream methods
	///////////////////////////////////////////////////////////////////////////////

	NS_IMETHODIMP
	nsEnigMimeListener::Available(PRUint32* _retval)
	{
	if (!_retval)
	return NS_ERROR_NULL_POINTER;

	*_retval = (mStreamLength > mStreamOffset) ?
	mStreamLength - mStreamOffset : 0;

	DEBUG_LOG(("nsEnigMimeListener::Available: %d\n", *_retval));

	return NS_OK;
	}

	NS_IMETHODIMP
	nsEnigMimeListener::Read(char* buf, PRUint32 count,
	PRUint32 *readCount)
	{
	DEBUG_LOG(("nsEnigMimeListener::Read: %d\n", count));

	if (!buf \|\| !readCount)
	return NS_ERROR_NULL_POINTER;

	PRInt32 avail = (mStreamLength > mStreamOffset) ?
	mStreamLength - mStreamOffset : 0;

	*readCount = ((PRUint32) avail > count) ? count : avail;

	if (*readCount) {
	memcpy(buf, mStreamBuf+mStreamOffset, *readCount);
	mStreamOffset += *readCount;
	}

	if (mStreamOffset >= mStreamLength) {
	Close();
	}

	return NS_OK;
	}

	NS_IMETHODIMP
	nsEnigMimeListener::ReadSegments(nsWriteSegmentFun writer,
	void * aClosure, PRUint32 count,
	PRUint32 *readCount)
	{
	DEBUG_LOG(("nsEnigMimeListener::ReadSegments: %d\n", count));

	if (!readCount)
	return NS_ERROR_NULL_POINTER;

	PRInt32 avail = (mStreamLength > mStreamOffset) ?
	mStreamLength - mStreamOffset : 0;

	PRUint32 readyCount = ((PRUint32) avail > count) ? count : avail;

	if (!readyCount) {
	*readCount = 0;

	} else {
	nsresult rv = writer(NS_STATIC_CAST(nsIInputStream*, this),
	aClosure, mStreamBuf+mStreamOffset,
	mStreamOffset, readyCount, readCount);
	if (NS_FAILED(rv))
	return rv;

	mStreamOffset += *readCount;
	}

	if (mStreamOffset >= mStreamLength) {
	Close();
	}

	return NS_OK;
	}

	NS_IMETHODIMP
	nsEnigMimeListener::IsNonBlocking(PRBool *aNonBlocking)
	{
	DEBUG_LOG(("nsEnigMimeListener::IsNonBlocking: \n"));

	*aNonBlocking = PR_TRUE;
	return NS_OK;
	}

	NS_IMETHODIMP
	nsEnigMimeListener::Close()
	{
	DEBUG_LOG(("nsEnigMimeListener::Close: \n"));
	mStreamBuf = nsnull;
	mStreamOffset = 0;
	mStreamLength = 0;
	return NS_OK;
	}

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