rechcomp.cpp

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// $Id: rechcomp.cpp 1688 2006-08-10 12:05:20Z gerry $
/* @@tag:xara-cn@@ DO NOT MODIFY THIS LINE
================================XARAHEADERSTART===========================
 
               Xara LX, a vector drawing and manipulation program.
                    Copyright (C) 1993-2006 Xara Group Ltd.
       Copyright on certain contributions may be held in joint with their
              respective authors. See AUTHORS file for details.

LICENSE TO USE AND MODIFY SOFTWARE
----------------------------------

This file is part of Xara LX.

Xara LX is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License version 2 as published
by the Free Software Foundation.

Xara LX and its component source files are distributed in the hope
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implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along
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Franklin St, Fifth Floor, Boston, MA  02110-1301 USA


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-----------------

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License described above, Xara Group Ltd grants to you certain additional
rights. 

The additional rights are to use, modify, and distribute the software
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----------------

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=================================XARAHEADEREND============================
 */

// Implementation of the colour record handler class of the v2 file format

#include "camtypes.h"

#include "rechcomp.h"   // CompressionRecordHandler for handling compression for v2 native/web files

#if !defined(EXCLUDE_FROM_XARLIB)
#include "colcomp.h"    // Document colour component, handles import of colours
//#include "camfiltr.h" // BaseCamelotFilter - version 2 native filter - in camtypes.h [AUTOMATICALLY REMOVED]
#endif

#include "cxftags.h"    // TAG_DEFINERGBCOLOUR TAG_DEFINECOMPLEXCOLOUR
//#include "cxfrec.h"       // TAG_STARTCOMPRESSION TAG_STOPCOMPRESSION - in camtypes.h [AUTOMATICALLY REMOVED]

DECLARE_SOURCE("$Revision: 1688 $");

// Declare smart memory handling in Debug builds
#define new CAM_DEBUG_NEW

// An implement to match the Declare in the .h file.
CC_IMPLEMENT_DYNAMIC(CompressionRecordHandler,CamelotRecordHandler);

//#if NEW_NATIVE_FILTER // New native filters, only available to those who need them at present

/********************************************************************************************

>   virtual UINT32* CompressionRecordHandler::GetTagList()

    Author:     Neville_Humphrys (Xara Group Ltd) <camelotdev@xara.com>
    Created:    6/6/96
    Inputs:     -
    Returns:    Ptr to a list of tag values, terminated by CXFRH_TAG_LIST_END
    Purpose:    Provides the record handler system with a list of records handled by this
                handler
    SeeAlso:    -

********************************************************************************************/

UINT32* CompressionRecordHandler::GetTagList()
{
    static UINT32 TagList[] = {TAG_STARTCOMPRESSION, TAG_ENDCOMPRESSION, CXFRH_TAG_LIST_END};

    return (UINT32*)&TagList;
}

/********************************************************************************************

>   virtual BOOL CompressionRecordHandler::HandleRecord(CXaraFileRecord* pCXaraFileRecord)

    Author:     Neville_Humphrys (Xara Group Ltd) <camelotdev@xara.com>
    Created:    6/6/96
    Inputs:     pCXaraFileRecord = ptr to record to handle
    Returns:    TRUE if handled successfuly
                FALSE otherwise
    Purpose:    Handles the given record.
    SeeAlso:    -

********************************************************************************************/

BOOL CompressionRecordHandler::HandleRecord(CXaraFileRecord* pCXaraFileRecord)
{
    ERROR2IF(pCXaraFileRecord == NULL,FALSE,"CompressionRecordHandler::HandleRecord pCXaraFileRecord is NULL");
    
    // This should be unused and we should error if this is called
    ERROR2(FALSE,"CompressionRecordHandler::HandleRecord called! Use Streamed form instead");
    
    BOOL ok = TRUE;

    switch (pCXaraFileRecord->GetTag())
    {
        case TAG_STARTCOMPRESSION:
            // Ask the compression system to be turned on
            TRACEUSER( "Neville", _T("Turn compression on\n"));
            ok = SetCompression(TRUE);
            break;
        case TAG_ENDCOMPRESSION:
            // Ask the compression system to be turned off
            TRACEUSER( "Neville", _T("Turn compression on\n"));
            ok = SetCompression(FALSE);
            break;

        default:
            ok = FALSE;
            ERROR3_PF(("CompressionRecordHandler::HandleRecord I don't handle records with the tag (%d)\n",pCXaraFileRecord->GetTag()));
            break;
    }

    return ok;
}

/********************************************************************************************

>   virtual BOOL CompressionRecordHandler::HandleStreamedRecord(CXaraFile * pCXFile, UINT32 Tag,UINT32 Size,UINT32 RecordNumber)

    Author:     Neville_Humphrys (Xara Group Ltd) <camelotdev@xara.com>
    Created:    7/6/96
    Inputs:     pCXFile = access to the CXaraFile class 
                Tag  = the tag value
                Size = size of record
                RecordNumber = the record number in the file
    Returns:    TRUE if handled ok
                FALSE otherwise
    Purpose:    This is the streamed record handler. It is used when 
    Errors:     -
    SeeAlso:    -

********************************************************************************************/

BOOL CompressionRecordHandler::HandleStreamedRecord(CXaraFile * pCXFile, UINT32 Tag,UINT32 Size,UINT32 RecordNumber)
{
    ERROR2IF(Tag <= 0,FALSE,"CompressionRecordHandler::HandleStreamedRecord Tag is negative!");
    
    BOOL ok = TRUE;

    switch (Tag)
    {
        case TAG_STARTCOMPRESSION:
            // Ask the compression system to be turned on
            TRACEUSER( "Neville", _T("Turn compression on\n"));
            ok = SetCompression(TRUE);
            break;
        case TAG_ENDCOMPRESSION:
            // Ask the compression system to be turned off
            TRACEUSER( "Neville", _T("Turn compression off\n"));
            ok = SetCompression(FALSE);
            break;

        default:
            ok = FALSE;
            ERROR3_PF(("CompressionRecordHandler::HandleStreamedRecord I don't handle records with the tag (%d)\n",Tag));
            break;
    }

    return ok;
}


/********************************************************************************************

>   virtual BOOL CompressionRecordHandler::IsStreamed(UINT32 Tag)

    Author:     Neville_Humphrys (Xara Group Ltd) <camelotdev@xara.com>
    Created:    7/6/96
    Inputs:     The tag of the record
    Returns:    TRUE if this is a streamed record
                FALSE otherwise
    Purpose:    Function to find out if the record is streamed or not.
    Errors:     -
    SeeAlso:    -

********************************************************************************************/

BOOL CompressionRecordHandler::IsStreamed(UINT32 Tag)
{
    // We don't want these records read in or handled by any outsiders as the ZLib code
    // reads things like the CRC and uncompressed size itself when compression is stopped
    return TRUE;
}


/********************************************************************************************

>   virtual void CompressionRecordHandler::GetRecordDescriptionText(CXaraFileRecord* pRecord,StringBase* pStr)

    Author:     Neville_Humphrys (Xara Group Ltd) <camelotdev@xara.com>
    Created:    12/6/96
    Inputs:     pRecord = ptr to a record
                pStr = ptr to string to update
    Returns:    -
    Purpose:    This provides descriptions for the compression on and off records.
    Errors:     -
    SeeAlso:    -

********************************************************************************************/

#ifdef XAR_TREE_DIALOG
void CompressionRecordHandler::GetRecordDescriptionText(CXaraFileRecord* pRecord,StringBase* pStr)
{
    if (pStr == NULL || pRecord == NULL)
        return;

    // Call base class first
    // This outputs the tag and size
    CamelotRecordHandler::GetRecordDescriptionText(pRecord,pStr);

    UINT32 Tag = pRecord->GetTag();
    TCHAR s[256];
    switch (Tag)
    {
        case TAG_STARTCOMPRESSION:
        {
            // Show what a compression on record looks like
            // Read the version number
            UINT32 Version = 0L;
            pRecord->ReadUINT32(&Version);
            
            UINT32 Type = 0L;
            UINT32 MajorVersion = Version / 100;
            UINT32 MinorVersion = Version - MajorVersion * 100;
            camSprintf(s,_T("Compression type\t= %d\r\n"),Type);
            (*pStr) += s;
            camSprintf(s,_T("Compression version\t= %d.%d\r\n"),MajorVersion,MinorVersion);
            (*pStr) += s;
            break;
        }
        case TAG_ENDCOMPRESSION:
        {
            // Show what a compression off record looks like
            // Read the number of bytes read 
            UINT32 Checksum = 0L;
            pRecord->ReadUINT32(&Checksum);
            camSprintf(s,_T("Compression checksum\t= %d\r\n"),Checksum);
            (*pStr) += s;
            UINT32 BytesRead = 0L;
            pRecord->ReadUINT32(&BytesRead);
            camSprintf(s,_T("Compression bytes read\t= %d\r\n"),BytesRead);
            (*pStr) += s;
            break;
        }
    }

    return;
}
#endif

//#endif // NEW_NATIVE_FILTER

---