if sc == ec {
		// The range doesn't cross any chunk boundaries.
		chunk := p.chunkOf(sc)
		scav += chunk.scavenged.popcntRange(si, ei+1-si)
		chunk.allocRange(si, ei+1-si)
		p.scav.index.alloc(sc, ei+1-si)
	} else {
		// The range crosses at least one chunk boundary.
		chunk := p.chunkOf(sc)
		scav += chunk.scavenged.popcntRange(si, pallocChunkPages-si)
		chunk.allocRange(si, pallocChunkPages-si)

	testSysStat.add(-int64(p.summaryMappedReady))

	// Free the mapped space for chunks.
	for i := range p.chunks {
		if x := p.chunks[i]; x != nil {
			p.chunks[i] = nil
			// This memory comes from sysAlloc and will always be page-aligned.
			sysFree(unsafe.Pointer(x), unsafe.Sizeof(*p.chunks[0]), testSysStat)
		}
	}
}

// BaseChunkIdx is a convenient chunkIdx value which works on both

		// first chunk do not exhaust the heap and the second chunk's summary is not in the
		// page immediately adjacent to the first chunk's summary's page.
		// Allocating into this first chunk to exhaustion and then into the second
		// chunk may then trigger a check in the allocator which erroneously looks at
		// unmapped summary memory and crashes.

		// Figure out how many chunks are in a physical page, then align BaseChunkIdx

##### Figure 1 - Secure Channel construction

```
plaintext   := chunk_0          ||       chunk_1          ||       chunk_2          ||       ...
                 |                         |                         |

  private val Response.isChunked: Boolean
    get() = "chunked".equals(header("Transfer-Encoding"), ignoreCase = true)

  private val Request.isChunked: Boolean
    get() = "chunked".equals(header("Transfer-Encoding"), ignoreCase = true)

  /**
   * Received trailers. Null unless the response body uses chunked transfer-encoding and includes
   * trailers. Undefined until the end of the response body.
   */

    return absl::FailedPreconditionError(
        absl::StrCat("Couldn't read ChunkMetadata from chunked proto.\n",
                     read_metadata.status().ToString()));
  }
  ChunkMetadata chunk_metadata = read_metadata.value();

  std::vector<ChunkInfo> chunks_info = std::vector<ChunkInfo>(
      chunk_metadata.chunks().begin(), chunk_metadata.chunks().end());

  FingerprintDef fingerprint_def;
  SavedModel saved_model;

// lineTooLong is generated as chunk header is bigger than 4KiB.
var errLineTooLong = errors.New("header line too long")

// malformed encoding is generated when chunk header is wrongly formed.
var errMalformedEncoding = errors.New("malformed chunked encoding")

// chunk is considered too big if its bigger than > 16MiB.
var errChunkTooBig = errors.New("chunk too big: choose chunk size <= 16MiB")

			for off := reverse; off < len(h.chunks); off += 1 << uint(n) {
				// We should never need to overwrite
				// an existing chunk. Also, 0 is
				// never a valid chunk, because the
				// lower 4 "count" bits should be
				// between 1 and 15.
				if sanity && h.chunks[off] != 0 {
					panic("impossible: overwriting existing chunk")
				}
				h.chunks[off] = chunk
			}
		} else {

			"User-Agent: Go-http-client/1.1\r\n" +
			"Transfer-Encoding: chunked\r\n\r\n" +
			chunk("abcdef") + chunk(""),

		WantProxy: "GET http://www.google.com/search HTTP/1.1\r\n" +
			"Host: www.google.com\r\n" +
			"User-Agent: Go-http-client/1.1\r\n" +
			"Transfer-Encoding: chunked\r\n\r\n" +
			chunk("abcdef") + chunk(""),
	},
	// HTTP/1.1 POST => chunked coding; body; empty trailer
	2: {
		Req: Request{

//
// In summary, there are 2 resources: arenas, and arena chunks. They exist in the
// following lifecycle:
//
// (1) A new arena is created via newArena.
// (2) Chunks are allocated to hold memory allocated into the arena with new or slice.
//    (a) Chunks are first allocated from the reuse list of partially-used chunks.
//    (b) If there are no such chunks, then chunks on the ready list are taken.