question: public synchronized void returnBuf ( byte [ ] buf ) { if ( buf == null || buf . length > mSizeLimit ) { return ; } mBuffersByLastUse . add ( buf ) ; int pos = Collections . binarySearch ( mBuffersBySize , buf , BUF_COMPARATOR ) ; if ( pos < 0 ) { pos = - pos - 1 ; } mBuffersBySize . add ( pos , buf ) ; mCurrentSize += buf . length ; trim ( ) ; }
target:  Returns a buffer to the pool, throwing away old buffers if the pool would exceed its allotted size.