javamanager/javarecognizer/src/recjar.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Tue, 27 Apr 2010 16:30:29 +0300
branchRCL_3
changeset 19 04becd199f91
child 57 59b3b4473dc8
permissions -rw-r--r--
Revision: v2.1.22 Kit: 201017
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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/*
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* Copyright (c) 2008 Nokia Corporation and/or its subsidiary(-ies).
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* All rights reserved.
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* This component and the accompanying materials are made available
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* under the terms of "Eclipse Public License v1.0"
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* which accompanies this distribution, and is available
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".
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*
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* Initial Contributors:
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* Nokia Corporation - initial contribution.
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*
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* Contributors:
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*
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* Description:  This file contains an implementation of Symbian MIME type recognizer
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 *                for MIME types application/java-archive (.jar) and
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 *                text/vnd.sun.j2me.app-descriptor (.jad)
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 *
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*/
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#include <apmrec.h>
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#include <apmstd.h>
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#include <ecom/ecom.h>
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#include <ecom/implementationproxy.h>
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#include "javauids.h"
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#include "recjar.h"
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const TUid KJavaRecognizerTUid = { KJavaRecognizerDllUid};
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const TInt KJarNumMimeTypes = 2;
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const TInt KMaxBufferLength = 100;
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_LIT8(KDataTypeJavaArchive, "application/java-archive");
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_LIT8(KDataTypeAppDescriptor, "text/vnd.sun.j2me.app-descriptor");
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// First four bytes of a ZIP file
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_LIT8(KPkWareLocalFileHeader, "\x50\x4B\x03\x04");
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_LIT8(KMidlet,"Midlet-");
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CApaJarRecognizer::CApaJarRecognizer() :
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        CApaDataRecognizerType(KJavaRecognizerTUid, CApaDataRecognizerType::EHigh)
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{
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    iCountDataTypes = KJarNumMimeTypes;
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}
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TUint CApaJarRecognizer::PreferredBufSize()
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{
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    return KMaxBufferLength;
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}
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TDataType CApaJarRecognizer::SupportedDataTypeL(TInt aIndex) const
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{
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    __ASSERT_DEBUG(aIndex >= 0 && aIndex < KJarNumMimeTypes, User::Invariant());
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    switch (aIndex)
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    {
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    case 0:
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        return TDataType(KDataTypeJavaArchive);
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    case 1:
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        return TDataType(KDataTypeAppDescriptor);
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    default:
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        // Should not come here, keep GCC happy
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        return TDataType(KDataTypeJavaArchive);
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    }
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}
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void CApaJarRecognizer::DoRecognizeL(const TDesC& aName, const TDesC8& aBuffer)
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{
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    if (aName.Length() > 4)
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    {
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        if (aName.Right(4).CompareF(_L(".jad")) == 0)
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        {
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            if (aBuffer.Length() > 0 && aBuffer.FindF(KMidlet())
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                    != KErrNotFound)
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            {
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                // The file contains the text "midlet-"
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                // so its almost certain to be a JAD file
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                iDataType = TDataType(KDataTypeAppDescriptor);
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                iConfidence = ECertain;
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            }
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            else
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            {
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                // Did not find "midlet-" in the supplied buffer so
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                // try searching the rest of the file...
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                //
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                TBool weOwnFileHandle = EFalse;
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                // The following call only Leaves if user supplied file
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                // handle can not be rewound, this is not worth
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                // catching with a TRAP handler.
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                RFile *file = FilePassedByHandleL();
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                RFile ownFile;
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                RFs ownFs;
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                if (!file)
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                {
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                    // We were not passed an RFile, so try and open the file directly.
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                    User::LeaveIfError(ownFs.Connect());
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                    CleanupClosePushL(ownFs);
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                    User::LeaveIfError(ownFile.Open(ownFs, aName, EFileRead
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                                                    | EFileShareReadersOrWriters | EFileStream));
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                    CleanupClosePushL(ownFile);
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                    file = &ownFile;
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                    weOwnFileHandle = ETrue;
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                }
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                TInt fileRemaining;
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                User::LeaveIfError(file->Size(fileRemaining));
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                if (fileRemaining > aBuffer.Length())
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                {
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                    // File is longer than buffer, so search remainder
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diff changeset
   108
                    // of file.
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parents:
diff changeset
   109
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parents:
diff changeset
   110
                    // Skip the start, which has already been read
04becd199f91 Revision: v2.1.22
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parents:
diff changeset
   111
                    TInt tmp = aBuffer.Length();
04becd199f91 Revision: v2.1.22
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parents:
diff changeset
   112
                    User::LeaveIfError(file->Seek(ESeekStart, tmp));
04becd199f91 Revision: v2.1.22
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diff changeset
   113
                    fileRemaining -= tmp;
04becd199f91 Revision: v2.1.22
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   114
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parents:
diff changeset
   115
                    // Buffer for processing the file
04becd199f91 Revision: v2.1.22
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diff changeset
   116
                    TUint8 buf[100]; // Must be at least 2*(KMidlet.Length()-1)
04becd199f91 Revision: v2.1.22
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parents:
diff changeset
   117
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   118
                    // Copy up to the last KMidlet.Length()-1 bytes
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diff changeset
   119
                    // from aBuffer, then append file data. This
04becd199f91 Revision: v2.1.22
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   120
                    // handles the case where the KMidlet string
04becd199f91 Revision: v2.1.22
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parents:
diff changeset
   121
                    // straddles the boundry by a byte (eg. buffer
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   122
                    // ends with "Midlet" and we are looking for
04becd199f91 Revision: v2.1.22
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   123
                    // "Midlet-").
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   124
                    TInt prefixLength = KMidlet().Length() - 1;
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   125
                    if (aBuffer.Length() < prefixLength)
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   126
                    {
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   127
                        prefixLength = aBuffer.Length();
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   128
                    }
04becd199f91 Revision: v2.1.22
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   129
                    TInt prefixOffset = aBuffer.Length() - prefixLength;
04becd199f91 Revision: v2.1.22
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   130
                    if (prefixOffset < 0)
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parents:
diff changeset
   131
                    {
04becd199f91 Revision: v2.1.22
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   132
                        prefixOffset = 0;
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   133
                    }
04becd199f91 Revision: v2.1.22
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   134
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   135
                    if (prefixLength)
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parents:
diff changeset
   136
                    {
04becd199f91 Revision: v2.1.22
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   137
                        // Copy prefix into buffer
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parents:
diff changeset
   138
                        TPtr8 prefixDes(&buf[0], prefixLength);
04becd199f91 Revision: v2.1.22
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parents:
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   139
                        prefixDes = aBuffer.Mid(prefixOffset, prefixLength);
04becd199f91 Revision: v2.1.22
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   140
                    }
04becd199f91 Revision: v2.1.22
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   141
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
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   142
                    while (fileRemaining > 0)
04becd199f91 Revision: v2.1.22
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   143
                    {
04becd199f91 Revision: v2.1.22
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parents:
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   144
                        // Read as much file data into the buffer as possible.
04becd199f91 Revision: v2.1.22
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parents:
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   145
                        TPtr8 bufBodyDes(&buf[0] + prefixLength, sizeof(buf)
04becd199f91 Revision: v2.1.22
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   146
                                         - prefixLength);
04becd199f91 Revision: v2.1.22
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parents:
diff changeset
   147
                        User::LeaveIfError(file->Read(bufBodyDes));
04becd199f91 Revision: v2.1.22
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
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   148
                        fileRemaining -= bufBodyDes.Length();
04becd199f91 Revision: v2.1.22
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parents:
diff changeset
   149
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   150
                        TPtrC8 bufDes(&buf[0], prefixLength
04becd199f91 Revision: v2.1.22
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parents:
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   151
                                      + bufBodyDes.Length());
04becd199f91 Revision: v2.1.22
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   152
                        if (bufDes.FindF(KMidlet()) != KErrNotFound)
04becd199f91 Revision: v2.1.22
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parents:
diff changeset
   153
                        {
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   154
                            // The file contains the text "midlet-"
04becd199f91 Revision: v2.1.22
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   155
                            // so its almost certain to be a JAD file
04becd199f91 Revision: v2.1.22
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parents:
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   156
                            iDataType = TDataType(KDataTypeAppDescriptor);
04becd199f91 Revision: v2.1.22
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parents:
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   157
                            iConfidence = ECertain;
04becd199f91 Revision: v2.1.22
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
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   158
                            break;
04becd199f91 Revision: v2.1.22
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parents:
diff changeset
   159
                        }
04becd199f91 Revision: v2.1.22
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parents:
diff changeset
   160
                        // Not found, copy prefix to start of buffer and try again.
04becd199f91 Revision: v2.1.22
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parents:
diff changeset
   161
                        if (bufDes.Length() == sizeof(buf))
04becd199f91 Revision: v2.1.22
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   162
                        {
04becd199f91 Revision: v2.1.22
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parents:
diff changeset
   163
                            // Copy prefix into buffer
04becd199f91 Revision: v2.1.22
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parents:
diff changeset
   164
                            prefixLength = KMidlet().Length() - 1;
04becd199f91 Revision: v2.1.22
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parents:
diff changeset
   165
                            TPtr8 prefixDes(buf, prefixLength);
04becd199f91 Revision: v2.1.22
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parents:
diff changeset
   166
                            prefixDes = bufDes.Mid(bufDes.Length()
04becd199f91 Revision: v2.1.22
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   167
                                                   - prefixLength, prefixLength);
04becd199f91 Revision: v2.1.22
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parents:
diff changeset
   168
                        }
04becd199f91 Revision: v2.1.22
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diff changeset
   169
                    }
04becd199f91 Revision: v2.1.22
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   170
                }
04becd199f91 Revision: v2.1.22
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   171
04becd199f91 Revision: v2.1.22
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
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diff changeset
   172
                if (weOwnFileHandle)
04becd199f91 Revision: v2.1.22
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parents:
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   173
                {
04becd199f91 Revision: v2.1.22
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parents:
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   174
                    CleanupStack::PopAndDestroy(&ownFile);
04becd199f91 Revision: v2.1.22
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   175
                    CleanupStack::PopAndDestroy(&ownFs);
04becd199f91 Revision: v2.1.22
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   176
                }
04becd199f91 Revision: v2.1.22
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
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   177
            }
04becd199f91 Revision: v2.1.22
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
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   178
        }
04becd199f91 Revision: v2.1.22
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   179
        else if (aName.Right(4).CompareF(_L(".jar")) == 0)
04becd199f91 Revision: v2.1.22
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
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   180
        {
04becd199f91 Revision: v2.1.22
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parents:
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   181
            // if the first 4 bytes of the buffer match the first 4
04becd199f91 Revision: v2.1.22
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parents:
diff changeset
   182
            // bytes of a zip file it must be a JAR file
04becd199f91 Revision: v2.1.22
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   183
            if (aBuffer.Length() > KPkWareLocalFileHeader().Length()
04becd199f91 Revision: v2.1.22
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   184
                    && KPkWareLocalFileHeader().Compare(aBuffer.Left(4)) == 0)
04becd199f91 Revision: v2.1.22
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   185
            {
04becd199f91 Revision: v2.1.22
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parents:
diff changeset
   186
                iDataType = TDataType(KDataTypeJavaArchive);
04becd199f91 Revision: v2.1.22
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   187
                iConfidence = ECertain;
04becd199f91 Revision: v2.1.22
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parents:
diff changeset
   188
            }
04becd199f91 Revision: v2.1.22
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parents:
diff changeset
   189
        }
04becd199f91 Revision: v2.1.22
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parents:
diff changeset
   190
    }
04becd199f91 Revision: v2.1.22
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   191
04becd199f91 Revision: v2.1.22
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   192
    return;
04becd199f91 Revision: v2.1.22
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parents:
diff changeset
   193
}
04becd199f91 Revision: v2.1.22
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   194
04becd199f91 Revision: v2.1.22
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parents:
diff changeset
   195
CApaDataRecognizerType* CApaJarRecognizer::CreateRecognizerL()
04becd199f91 Revision: v2.1.22
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   196
{
04becd199f91 Revision: v2.1.22
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parents:
diff changeset
   197
    return new(ELeave) CApaJarRecognizer();
04becd199f91 Revision: v2.1.22
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parents:
diff changeset
   198
}
04becd199f91 Revision: v2.1.22
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   199
04becd199f91 Revision: v2.1.22
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   200
const TImplementationProxy ImplementationTable[] =
04becd199f91 Revision: v2.1.22
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   201
{
04becd199f91 Revision: v2.1.22
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diff changeset
   202
    IMPLEMENTATION_PROXY_ENTRY(KRecognizerEcomImplUid, CApaJarRecognizer::CreateRecognizerL)
04becd199f91 Revision: v2.1.22
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diff changeset
   203
};
04becd199f91 Revision: v2.1.22
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parents:
diff changeset
   204
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   205
EXPORT_C const TImplementationProxy* ImplementationGroupProxy(TInt& aTableCount)
04becd199f91 Revision: v2.1.22
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parents:
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   206
{
04becd199f91 Revision: v2.1.22
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parents:
diff changeset
   207
    aTableCount = sizeof(ImplementationTable) / sizeof(TImplementationProxy);
04becd199f91 Revision: v2.1.22
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parents:
diff changeset
   208
    return ImplementationTable;
04becd199f91 Revision: v2.1.22
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parents:
diff changeset
   209
}
04becd199f91 Revision: v2.1.22
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   210