root/src/blocks/block.c

DEFINITIONS

1. SWFBlock_setDefined
2. SWFBlock_isDefined
3. SWFBlock_getLength
4. destroySWFBlock
5. completeSWFBlock
6. writeSWFBlockToMethod
7. SWFBlockInit
8. newEmptySWFBlock
9. newSWFShowFrameBlock
10. newSWFEndBlock
11. SWFBlock_getType

/*
    Ming, an SWF output library
    Copyright (C) 2002  Opaque Industries - http://www.opaque.net/

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

/* $Id: block.c,v 1.17 2008/06/25 12:36:37 krechert Exp $ */

#include <math.h>
#include <stdlib.h>

#include "block.h"
#include "method.h"
#include "libming.h"


void
SWFBlock_setDefined(SWFBlock block)
{
        block->isDefined = TRUE;
}


byte
SWFBlock_isDefined(SWFBlock block)
{
        return block->isDefined;
}


int
SWFBlock_getLength(SWFBlock block)
{
        return block->length;
}


void
destroySWFBlock(SWFBlock block)
{
        if ( block->dtor )
                block->dtor(block);
        else
                free(block);
}


int
completeSWFBlock(SWFBlock block)
{
        switch(block->type)
        {
        case SWF_UNUSEDBLOCK:
        case SWF_MINGFONT:
                return 0;
        default:
                break;
        }
                
        if ( !block->completed )
        {
                if ( block->complete )
                        block->length = block->complete(block);

                block->completed = TRUE;
        }

        if (block->type == SWF_PREBUILT)
                return block->length;
        if ( block->length > 62 ||
                         block->type == SWF_DEFINELOSSLESS ||
                         block->type == SWF_DEFINELOSSLESS2 )
        {
                return block->length + 6;
        }
        else
                return block->length + 2;
}


int
writeSWFBlockToMethod(SWFBlock block, SWFByteOutputMethod method, void *data)
{
        SWFBlocktype type = block->type;
        unsigned int length;

        switch(block->type)
        {
        case SWF_UNUSEDBLOCK:
        case SWF_MINGFONT:
                return 0;
        default:
                break;
        }

        if ( !block->completed )
                completeSWFBlock(block);

        length = block->length;

        /* write header */

        if(type == SWF_PREBUILTCLIP)
                type = SWF_DEFINESPRITE;
        if ( type == SWF_PREBUILT )
                ;
        else if ( length > 62 ||
                         type == SWF_DEFINELOSSLESS ||
                         type == SWF_DEFINELOSSLESS2 )
        {
                /* yep, a definebitslossless block has to be long form, even if it's
                         under 63 bytes.. */
                method((unsigned char)(((type&0x03)<<6) + 0x3f), data);
                method((unsigned char)((type>>2) & 0xff), data);
                methodWriteUInt32(length, method, data);
                length += 6;
        }
        else
        {       methodWriteUInt16(length + ((type)<<6), method, data);
                length += 2;
        }

        if ( block->writeBlock )
                block->writeBlock(block, method, data);

        return length;
}


void
SWFBlockInit(SWFBlock block)
{
        block->type = SWF_END; // XXX - ???
        block->writeBlock = NULL;
        block->complete = NULL;
        block->dtor = NULL;

        block->length = 0;
        block->isDefined = FALSE;
        block->completed = FALSE;
        
        block->swfVersion = 0;
}


SWFBlock
newEmptySWFBlock(SWFBlocktype type)
{
        SWFBlock block = (SWFBlock) malloc(sizeof(struct SWFBlock_s));
        SWFBlockInit(block);
        block->type = type;

        return block;
}


SWFBlock
newSWFShowFrameBlock()
{
        return newEmptySWFBlock(SWF_SHOWFRAME);
}


SWFBlock
newSWFEndBlock()
{
        return newEmptySWFBlock(SWF_END);
}


SWFBlocktype
SWFBlock_getType(SWFBlock block)
{
        return block->type;
}


/*
 * Local variables:
 * tab-width: 2
 * c-basic-offset: 2
 * End:
 */