func (m Metadata) ReadFrom(r io.Reader) (n int64, err error) {
var rw must.ReadWriter
var key byte
for key != 0x7f {
// Read type+key
key = byte(rw.ReadInt8(r))
if key == 0x7f {
break
}
var (
typ byte = key & 0xE0 >> 5
index byte = key & 0x1F
payload Entry = EntryFrom(typ)
)
// Read payload
rw.Must(payload.ReadFrom(r))
m.Entries[index] = payload
}
return rw.Result()
}
func (e *EntryVector) WriteTo(w io.Writer) (n int64, err error) {
var rw must.ReadWriter
for i := 0; i < len(e.Data); i++ {
rw.Must(e.Data[i].WriteTo(w))
}
return rw.Result()
}
func (e *EntryVector) ReadFrom(r io.Reader) (n int64, err error) {
var rw must.ReadWriter
for i := 0; i < len(e.Data); i++ {
rw.Must(e.Data[i].ReadFrom(r))
}
return rw.Result()
}
func (re *Region) ReadFrom(r io.Reader) (n int64, err error) {
var rw must.ReadWriter
// Copy everything to a buffer. Max size: 4MB + 8KB
var all bytes.Buffer
rw.Must(io.Copy(&all, r))
// Read chunk positions.
for i := 0; i < len(re.Pos); i++ {
// Read 4KB offset from file start. Only first 3 bytes needed.
re.Pos[i] = rw.ReadInt32(&all) >> 8
// Fourth byte is a 4KB section counter which is ignored because we
// already know the length of chunk data.
//
// More info here:
// http://www.minecraftwiki.net/wiki/Region_file_format#Structure
//
// " The remainder of the file consists of data for up to 1024 chunks,
// interspersed with an arbitrary amount of unused space. "
//
// TLDR: Just another idiotic/bad designed spec.
}
// Read chunk timestamps.
//
// Last modification time of a chunk. Unit: unknown, seconds?
//
// NOTE: Does something use this? MCEdit maybe?
for i := 0; i < len(re.Mod); i++ {
re.Mod[i] = rw.ReadInt32(&all)
}
// Read chunk data.
for i := 0; i < len(re.Data); i++ {
re.Data[i].Length = rw.ReadInt32(&all)
re.Data[i].Compression = byte(rw.ReadInt8(&all))
var buf bytes.Buffer
io.CopyN(&buf, &all, length-1)
switch scheme {
case Gzip:
panic("Alpha chunk format not implemented.")
case Zlib:
zr := zlib.NewReader(&all)
io.Copy(&buf, zr)
}
re.Data[i].Chunk = buf.Bytes()
}
return rw.Result()
}
func (o *ObjectData) WriteTo(w io.Writer) (n int64, err error) {
var rw must.ReadWriter
rw.WriteInt32(w, o.Data)
if o.Data != 0 {
rw.WriteInt16(w, o.SpeedX)
rw.WriteInt16(w, o.SpeedY)
rw.WriteInt16(w, o.SpeedZ)
}
return rw.Result()
}
func (o *ObjectData) ReadFrom(r io.Reader) (n int64, err error) {
var rw must.ReadWriter
o.Data = rw.ReadInt32(r)
if o.Data != 0 {
o.SpeedX = rw.ReadInt16(r)
o.SpeedY = rw.ReadInt16(r)
o.SpeedZ = rw.ReadInt16(r)
}
return rw.Result()
}
func (m Metadata) WriteTo(w io.Writer) (n int64, err error) {
var rw must.ReadWriter
var buf bytes.Buffer
for index, payload := range m.Entries {
buf.Reset()
typ := payload.Type()
rw.Check(buf.WriteByte(typ<<5 | (index & 0x1F)))
// Write type+key & payload
rw.Must(buf.WriteTo(w))
rw.Must(payload.WriteTo(w))
}
buf.Reset()
rw.Check(buf.WriteByte(0x7f))
rw.Must(buf.WriteTo(w))
return rw.Result()
}
func (s *Slot) WriteTo(w io.Writer) (n int64, err error) {
var rw must.ReadWriter
rw.WriteInt16(w, s.BlockId)
if s.BlockId == -1 {
return rw.Result()
}
rw.WriteInt8(w, int8(s.Amount))
rw.WriteInt16(w, s.Damage)
if s.Enchantments == nil {
rw.WriteInt16(w, -1)
return rw.Result()
}
var bn, bw bytes.Buffer
rw.Check(nbt.Write(&bn, s.Enchantments))
gw := gzip.NewWriter(&bw)
rw.Must(io.Copy(gw, &bn))
rw.Check(gw.Close())
rw.WriteInt16(w, int16(bw.Len()))
rw.WriteByteArray(w, bw.Bytes())
return rw.Result()
}
func (s *Slot) ReadFrom(r io.Reader) (n int64, err error) {
var rw must.ReadWriter
s.BlockId = rw.ReadInt16(r)
if s.BlockId == -1 {
return rw.Result()
}
s.Amount = byte(rw.ReadInt8(r))
s.Damage = rw.ReadInt16(r)
Length := rw.ReadInt16(r)
if Length == -1 {
return rw.Result()
}
var br bytes.Buffer
// Copy gzip'd NBT Compound
gs := rw.ReadByteArray(r, int(Length))
bn := bytes.NewBuffer(gs)
// Ungzip byte array
gr, err := gzip.NewReader(bn)
rw.Check(err)
rw.Must(io.Copy(&br, gr))
rw.Check(gr.Close())
// Read NBT Compound
s.Enchantments, err = nbt.Read(&br)
rw.Check(err)
return rw.Result()
}