AsnBuf simb_buf;
	AsnLen simb_len = strlen(sender_tb_cs);
	simb_buf.InstallData (&s, simb_len);
	t.sender->BEnc(simb_buf); 

    AsnLen l = BEncContent(b);
    l += BEncDefLen(b, l);

    if (len <  128 )
    {
        b.PutByteRvs ((unsigned char)len);
....

	if (dataStart <= blkStart)
        AddBuffer();

        int dataLen = DataLen();
        int len= BlkLen();
        int readAdjust = readLoc - blkStart;
        unsigned long addedLength= 100000 ;
        if ((unsigned long)segLen-( 100000 -dataLen) > addedLength)
            addedLength = (unsigned long)segLen +  10000 ;   // Attempt to get all requested for this seg 
        
        void *ptr =  /*realloc*/ calloc( 1 , len + addedLength);

        memcpy((void *)((unsigned long)ptr+addedLength), blkStart, len );   // SINCE reverse loaded. 
        free(blkStart);
...

   Debug Assertion failed
   Program: my.exe
   File: dbgheap.c
   Line:  1011 
   Expression: _CrtIsValidHelpPointer(pUserData)