//     Say we are rotating abcdefgh by 5. We start with abcde|fgh. The smaller block is [fgh]:
    //     [abc]de|[fgh] -> [fgh]de|[abc]. Now [fgh] is in the right place, but we need to swap [de]
    //     with [abc]: fgh[de]|a[bc] -> fgh[bc]|a[de]. Now we need to swap [a] with [bc]:
    //     fgh[b]c|[a]de -> fgh[a]c|[b]de. Finally we need to swap [c] with [b]:
    //     fgha[c]|[b]de -> fgha[b]|[c]de. Because these two blocks are the same size, we are done.

    peer.acceptFrame() // HEADERS STREAM 3
    peer.sendFrame().windowUpdate(3, 5)
    peer.acceptFrame() // DATA STREAM 3 "abcde"
    peer.sendFrame().windowUpdate(3, 5)
    peer.acceptFrame() // DATA STREAM 3 "fghi"
    peer.play()

    // Play it back.
    val connection = connect(peer)
    connection.writePingAndAwaitPong() // Ensure the SETTINGS have been received.

//		{Offset: 21, Length: 4},  // Hole fragment for 21..24
//	}
//
// Then the content of the resulting sparse file with a Header.Size of 25 is:
//
//	var sparseFile = "\x00"*2 + "abcde" + "\x00"*11 + "fgh" + "\x00"*4
type (
	sparseDatas []sparseEntry
	sparseHoles []sparseEntry
)

// validateSparseEntries reports whether sp is a valid sparse map.

0E84          ; valid                                  # 1.1  LAO LETTER KHO TAM
0E85          ; disallowed                             # NA   <reserved-0E85>
0E86          ; valid                                  # 12.0 LAO LETTER PALI GHA
0E87..0E88    ; valid                                  # 1.1  LAO LETTER NGO..LAO LETTER CO
0E89          ; valid                                  # 12.0 LAO LETTER PALI CHA

1hHI,wBAAA,EACA,2BAAA,EmB7BJ,+DnB0CI,uBAAA,EACA,0BAAA,ERuhHJ,mFACA,0FAFA,kE2BjkHA,iEnB4BI,wBAAA,EACA,2BAAA,ER6iHJ,gFACA,uFAFA,+D2BzkHA,8DnB4BI,wBAAA,EACA,2BAAA,ERojHJ,oB2BngHA,qBAEE,QAAA,YAAA,QAAA,K3BugHF,yB2BzgHA,0BAQI,SAAA,SACA,QAAA,E3BsgHJ,+B2B/gHA,gCAYM,QAAA,E3B2gHN,8BACA,2CAEA,2CADA,wD2BzhHA,+B3BohHA,4CAEA,4CADA,yD2BjgHI,YAAA,KAIJ,qBAAuB,aAAA,KACvB,oBAAsB,YAAA,KAQtB,kBACE,QAAA,YAAA,QAAA,KACA,eAAA,OAAA,YAAA,OACA,QAAA,QAAA,OACA,cAAA,E1B2DI,UAAA,K0BzDJ,YAAA,IACA,YAAA,IACA,MAAA,QACA,WAAA,OACA,Y...