root/src/SWFTag.cpp

DEFINITIONS

1. get
2. writeHeader

#include <SWFTag.h>
#include "SWF.h"
#include <cstring>

namespace SWF {

Tag *Tag::get( Reader *r, int end, Context *ctx ) {
        uint16_t h = r->getWord();
        int type = h>>6;
        int len = h&0x3F;
        if( len == 0x3F ) { // long size
                len = r->getInt();
        }
        
        // sanity check
        if( len > 100000000 ) {
                fprintf(stderr,"ridiculous tag size: %i, ignoring.\n", len );
//              r->setEOF();
                return NULL;
        }

        Tag *ret = getByType( type );
        
        if( !ret ) {
                ret = new UnknownTag;
        }
        
        ret->setType( type );
        ret->setLength( len );
        ret->parse( r, r->getPosition()+len, ctx );

        return ret;
}

void Tag::writeHeader( Writer *w, Context *ctx, size_t len ) {
//      printf("write tag %02X, len %i, recorded %i(+header, 2 or 6), position %i\n", type, len, this->len, w->getPosition() );
        // shouldnt this be 0x3f - macromedia flash seems to use long length for > 1F...
        len -= (len >= SWF_LONG_TAG + 6) ? 6 : 2;
        uint16_t h = type<<6;
        if( len >= SWF_LONG_TAG ) {
                h |= 0x3F;
                w->putWord(h);
                w->putInt(len);
        } else {
                h |= len;
                w->putWord(h);
        }
}
}