Cmd            LoadCmd
		Len            uint32
		Ilocalsym      uint32
		Nlocalsym      uint32
		Iextdefsym     uint32
		Nextdefsym     uint32
		Iundefsym      uint32
		Nundefsym      uint32
		Tocoffset      uint32
		Ntoc           uint32
		Modtaboff      uint32
		Nmodtab        uint32
		Extrefsymoff   uint32
		Nextrefsyms    uint32
		Indirectsymoff uint32
		Nindirectsyms  uint32
		Extreloff      uint32

			err = machoUpdateLoadCommand(reader, linkseg, linkoffset, &macho.SymtabCmd{}, "Symoff", "Stroff")
		case macho.LoadCmdDysymtab:
			err = machoUpdateLoadCommand(reader, linkseg, linkoffset, &macho.DysymtabCmd{}, "Tocoffset", "Modtaboff", "Extrefsymoff", "Indirectsymoff", "Extreloff", "Locreloff")
		case LC_CODE_SIGNATURE, LC_SEGMENT_SPLIT_INFO, LC_FUNCTION_STARTS, LC_DATA_IN_CODE, LC_DYLIB_CODE_SIGN_DRS,
			LC_DYLD_EXPORTS_TRIE, LC_DYLD_CHAINED_FIXUPS:

	n += nkind[SymKindExtdef]

	ml.data[4] = uint32(n)                   /* iundefsym */
	ml.data[5] = uint32(nkind[SymKindUndef]) /* nundefsym */

	ml.data[6] = 0  /* tocoffset */
	ml.data[7] = 0  /* ntoc */
	ml.data[8] = 0  /* modtaboff */
	ml.data[9] = 0  /* nmodtab */
	ml.data[10] = 0 /* extrefsymoff */
	ml.data[11] = 0 /* nextrefsyms */

	ldr := ctxt.loader

		return color.YCbCr{}
	}
	yi := p.YOffset(x, y)
	ci := p.COffset(x, y)
	return color.YCbCr{
		p.Y[yi],
		p.Cb[ci],
		p.Cr[ci],
	}
}

// YOffset returns the index of the first element of Y that corresponds to
// the pixel at (x, y).
func (p *YCbCr) YOffset(x, y int) int {
	return (y-p.Rect.Min.Y)*p.YStride + (x - p.Rect.Min.X)
}

// COffset returns the index of the first element of Cb or Cr that corresponds

			col := color.RGBA{
				uint8(rnd.Intn(256)),
				uint8(rnd.Intn(256)),
				uint8(rnd.Intn(256)),
				255,
			}
			imgRGBA.SetRGBA(x, y, col)
			yo := imgYCbCr.YOffset(x, y)
			co := imgYCbCr.COffset(x, y)
			cy, ccr, ccb := color.RGBToYCbCr(col.R, col.G, col.B)
			imgYCbCr.Y[yo] = cy
			imgYCbCr.Cb[co] = ccr
			imgYCbCr.Cr[co] = ccb
		}
	}

	// Now check that both images are identical after an encode.

	// will be set multiple times. That's OK. We just want to avoid a uniform image.
	for y := r1.Min.Y; y < r1.Max.Y; y++ {
		for x := r1.Min.X; x < r1.Max.X; x++ {
			yi := m.YOffset(x, y)
			ci := m.COffset(x, y)
			m.Y[yi] = uint8(16*y + x)
			m.Cb[ci] = uint8(y + 16*x)
			m.Cr[ci] = uint8(y + 16*x)
		}
	}

	// Make various sub-images of m.
	for y0 := delta.Y + 3; y0 < delta.Y+7; y0++ {

		}
		find = func(want ChunkIdx, wantOffset uint) {
			t.Helper()

			got, gotOffset := si.Find(force)
			if want != got {
				t.Errorf("find: wanted chunk index %d, got %d", want, got)
			}
			if wantOffset != gotOffset {
				t.Errorf("find: wanted page offset %d, got %d", wantOffset, gotOffset)
			}
			if t.Failed() {
				t.FailNow()
			}
			si.SetEmpty(got)
		}
		nextGen = func() {

pkg image, method (*NYCbCrA) AOffset(int, int) int
pkg image, method (*NYCbCrA) At(int, int) color.Color
pkg image, method (*NYCbCrA) Bounds() Rectangle
pkg image, method (*NYCbCrA) COffset(int, int) int
pkg image, method (*NYCbCrA) ColorModel() color.Model
pkg image, method (*NYCbCrA) NYCbCrAAt(int, int) color.NYCbCrA
pkg image, method (*NYCbCrA) Opaque() bool

),this._changeInProgress=null)),this}return this._isUTC?n:Ja(this)},it.utc=function(e){return this.utcOffset(0,e)},it.local=function(e){return this._isUTC&&(this.utcOffset(0,e),this._isUTC=!1,e&&this.subtract(Ja(this),"m")),this},it.parseZone=function(){if(null!=this._tzm)this.utcOffset(this._tzm,!1,!0);else if("string"==typeof this._i){var e=Fa(ne,this._i);null!=e?this.utcOffset(e):this.utcOffset(0,!0)}return this},it.hasAlignedHourOffset=function(e){return!!this.isValid()&&(e=e?Sa(e).utcOffset...

		{"DysymtabCmd.Nlocalsym", Field, 0},
		{"DysymtabCmd.Nlocrel", Field, 0},
		{"DysymtabCmd.Nmodtab", Field, 0},
		{"DysymtabCmd.Ntoc", Field, 0},
		{"DysymtabCmd.Nundefsym", Field, 0},
		{"DysymtabCmd.Tocoffset", Field, 0},
		{"ErrNotFat", Var, 3},
		{"FatArch", Type, 3},
		{"FatArch.FatArchHeader", Field, 3},
		{"FatArch.File", Field, 3},
		{"FatArchHeader", Type, 3},
		{"FatArchHeader.Align", Field, 3},