b[unzig[zig]] = ac << al
								} else {
									if val0 != 0x0f {
										d.eobRun = uint16(1 << val0)
										if val0 != 0 {
											bits, err := d.decodeBits(int32(val0))
											if err != nil {
												return err
											}
											d.eobRun |= uint16(bits)
										}
										d.eobRun--
										break
									}
									zig += 0x0f
								}
							}
						}

	// extended, as per section 4.11.
	baseline    bool
	progressive bool

	jfif                bool
	adobeTransformValid bool
	adobeTransform      uint8
	eobRun              uint16 // End-of-Band run, specified in section G.1.2.2.

	comp       [maxComponents]component
	progCoeffs [maxComponents][]block // Saved state between progressive-mode scans.

function decodeDCSuccessive(component,zz){zz[0]|=readBit()<<successive;}
var eobrun=0;function decodeACFirst(component,zz){if(eobrun>0){eobrun--;return;}
var k=spectralStart,e=spectralEnd;while(k<=e){var rs=decodeHuffman(component.huffmanTableAC);var s=rs&15,r=rs>>4;if(s===0){if(r<15){eobrun=receive(r)+(1<<r)-1;break;}
k+=16;continue;}
k+=r;var z=dctZigZag[k];zz[z]=receiveAndExtend(s)*(1<<successive);k++;}}

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