uint64_t BinaryRefReader::get_var_int(uint8_t* nRead)
{
uint32_t nBytes;
uint64_t varInt = BtcUtils::readVarInt( bdRef_.getPtr() + pos_, getSizeRemaining(), &nBytes);
if(nRead != NULL)
*nRead = nBytes;
pos_ += nBytes;
return varInt;
}
/*
* Get maximum loop iterations possible
*
* p: packet data structure, same as the one found in snort.
* loop: structure that defines buffer via flags, and has cursor increment
* cursor: current position within buffer
*
* Returns:
* >= 0 : calculated max possible loop count
* < 0 : error
*
* Notes:
* This function is a sanity check on a loop count. It presumes the caller is looking
* through a content buffer, cursor_increment hops at a time. It calculates how many whole
* hops (plus a last partial hop) are possible given the remaining buffer size. Passing in
* a cursor of NULL means look at the whole buffer.
*
*/
int32_t getLoopLimit(void *p, LoopInfo *loop, const u_int8_t *cursor)
{
int32_t loop_max;
int size;
size = getSizeRemaining(p, loop->cursorAdjust->flags, cursor);
if ( size < 0 )
return -1;
/* Calculate how many whole hops are within buffer */
loop_max = size/(loop->cursorAdjust->offset);
/* Add one for partial hop remaining */
if ( size%(loop->cursorAdjust->offset) != 0 )
loop_max++;
/* Sanity check; limit size to 65535 */
return loop_max & 0xFFFF;
}
