xpcom/reflect/xptinfo/src/xptiZipLoader.cpp
author jst@mozilla.org
Wed, 10 Oct 2007 16:03:14 -0700
changeset 6804 81046e3390a0add71c14c7da17dac72d4f71175e
parent 1 9b2a99adc05e53cd4010de512f50118594756650
permissions -rw-r--r--
Landing basic framework for dtrace support (bug 388564). Patch by john.rice@sun.com and padraig.obriain@sun.com. r+a=ted.mielczarek@gmail.com, sr=sayrer@gmail.com

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* ***** BEGIN LICENSE BLOCK *****
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 * 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
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 * for the specific language governing rights and limitations under the
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 * 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):
 *   Mike McCabe <mccabe@netscape.com>
 *   John Bandhauer <jband@netscape.com>
 *
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 * either of 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"),
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/* Implementation of xptiZipLoader. */

#include "xptiprivate.h"

XPTHeader*
xptiZipLoader::ReadXPTFileFromInputStream(nsIInputStream *stream,
                                          xptiWorkingSet* aWorkingSet)
{
    XPTCursor cursor;
    PRUint32 totalRead = 0;
    XPTState *state = nsnull;
    XPTHeader *header = nsnull;

    PRUint32 flen;
    stream->Available(&flen);
    
    char *whole = new char[flen];
    if (!whole)
    {
        return nsnull;
    }

    // all exits from on here should be via 'goto out' 

    while(flen - totalRead)
    {
        PRUint32 avail;
        PRUint32 read;

        if(NS_FAILED(stream->Available(&avail)))
        {
            goto out;
        }

        if(avail > flen)
        {
            goto out;
        }

        if(NS_FAILED(stream->Read(whole+totalRead, avail, &read)))
        {
            goto out;
        }

        totalRead += read;
    }
    
    // Go ahead and close the stream now.
    stream = nsnull;

    if(!(state = XPT_NewXDRState(XPT_DECODE, whole, flen)))
    {
        goto out;
    }
    
    if(!XPT_MakeCursor(state, XPT_HEADER, 0, &cursor))
    {
        goto out;
    }
    
    if (!XPT_DoHeader(aWorkingSet->GetStructArena(), &cursor, &header))
    {
        header = nsnull;
        goto out;
    }

 out:
    if(state)
        XPT_DestroyXDRState(state);
    if(whole)
        delete [] whole;
    return header;
}