func decodeStruct(engine *decEngine, rtyp *reflect.StructType, b *bytes.Buffer, p uintptr, indir int) os.Error {
if indir > 0 {
up := unsafe.Pointer(p)
if indir > 1 {
up = decIndirect(up, indir)
}
if *(*unsafe.Pointer)(up) == nil {
// Allocate object by making a slice of bytes and recording the
// address of the beginning of the array. TODO(rsc).
b := make([]byte, rtyp.Size())
*(*unsafe.Pointer)(up) = unsafe.Pointer(&b[0])
}
p = *(*uintptr)(up)
}
state := newDecodeState(b)
state.fieldnum = -1
basep := p
for state.err == nil {
delta := int(decodeUint(state))
if delta < 0 {
state.err = os.ErrorString("gob decode: corrupted data: negative delta")
break
}
if state.err != nil || delta == 0 { // struct terminator is zero delta fieldnum
break
}
fieldnum := state.fieldnum + delta
if fieldnum >= len(engine.instr) {
state.err = errRange
break
}
instr := &engine.instr[fieldnum]
p := unsafe.Pointer(basep + instr.offset)
if instr.indir > 1 {
p = decIndirect(p, instr.indir)
}
instr.op(instr, state, p)
state.fieldnum = fieldnum
}
return state.err
}
