Is HeapDump bytes left the same with heap Size

[todLiu]

Hello eaftan ,
I have gone through the code below and suspect if the heap dump bytesleft the same with dump heapSize? as to the same hprof file , the IBM Heap Analyzer give one different number for heap size ?
could u help to explain? thanks in advance.
case 0xc:
// Heap dump
while (bytesLeft > 0) {
bytesLeft -= parseHeapDump(in, idSize);
}