1 files changed, 182 insertions, 0 deletions
diff --git a/packet/command/fastupdate/fastupdate.go b/packet/command/fastupdate/fastupdate.go
new file mode 100644
index 0000000..e6e344c
--- /dev/null
+++ b/packet/command/fastupdate/fastupdate.go
@@ -0,0 +1,182 @@
+package fastupdate
+
+import (
+	"github.com/osm/quake/common/buffer"
+	"github.com/osm/quake/common/context"
+	"github.com/osm/quake/protocol"
+)
+
+type Command struct {
+	Bits     byte
+	MoreBits byte
+	Entity8  byte
+	Entity16 uint16
+	Model    byte
+	Frame    byte
+	ColorMap byte
+	Skin     byte
+	Effects  byte
+	Origin   [3]float32
+	Angle    [3]float32
+}
+
+func (cmd *Command) Bytes() []byte {
+	buf := buffer.New()
+
+	buf.PutByte(cmd.Bits)
+
+	bits16 := uint16(cmd.Bits)
+	bits16 &= 127
+
+	if bits16&protocol.NQUMoreBits != 0 {
+		buf.PutByte(cmd.MoreBits)
+		bits16 |= uint16(cmd.MoreBits) << 8
+	}
+
+	if bits16&protocol.NQULongEntity != 0 {
+		buf.PutUint16(cmd.Entity16)
+	} else {
+		buf.PutByte(cmd.Entity8)
+	}
+
+	if bits16&protocol.NQUModel != 0 {
+		buf.PutByte(cmd.Model)
+	}
+
+	if bits16&protocol.NQUFrame != 0 {
+		buf.PutByte(cmd.Frame)
+	}
+
+	if bits16&protocol.NQUColorMap != 0 {
+		buf.PutByte(cmd.ColorMap)
+	}
+
+	if bits16&protocol.NQUSkin != 0 {
+		buf.PutByte(cmd.Skin)
+	}
+
+	if bits16&protocol.NQUEffects != 0 {
+		buf.PutByte(cmd.Effects)
+	}
+
+	if bits16&protocol.NQUOrigin1 != 0 {
+		buf.PutCoord16(cmd.Origin[0])
+	}
+
+	if bits16&protocol.NQUAngle1 != 0 {
+		buf.PutAngle8(cmd.Angle[0])
+	}
+
+	if bits16&protocol.NQUOrigin2 != 0 {
+		buf.PutCoord16(cmd.Origin[1])
+	}
+
+	if bits16&protocol.NQUAngle2 != 0 {
+		buf.PutAngle8(cmd.Angle[1])
+	}
+
+	if bits16&protocol.NQUOrigin3 != 0 {
+		buf.PutCoord16(cmd.Origin[2])
+	}
+
+	if bits16&protocol.NQUAngle3 != 0 {
+		buf.PutAngle8(cmd.Angle[2])
+	}
+
+	return buf.Bytes()
+}
+
+func Parse(ctx *context.Context, buf *buffer.Buffer, bits byte) (*Command, error) {
+	var err error
+	var cmd Command
+
+	cmd.Bits = bits
+
+	bits16 := uint16(bits)
+	bits16 &= 127
+
+	if bits16&protocol.NQUMoreBits != 0 {
+		if cmd.MoreBits, err = buf.ReadByte(); err != nil {
+			return nil, err
+		}
+		bits16 |= uint16(cmd.MoreBits) << 8
+	}
+
+	if bits16&protocol.NQULongEntity != 0 {
+		if cmd.Entity16, err = buf.GetUint16(); err != nil {
+			return nil, err
+		}
+	} else {
+		if cmd.Entity8, err = buf.ReadByte(); err != nil {
+			return nil, err
+		}
+	}
+
+	if bits16&protocol.NQUModel != 0 {
+		if cmd.Model, err = buf.ReadByte(); err != nil {
+			return nil, err
+		}
+	}
+
+	if bits16&protocol.NQUFrame != 0 {
+		if cmd.Frame, err = buf.ReadByte(); err != nil {
+			return nil, err
+		}
+	}
+
+	if bits16&protocol.NQUColorMap != 0 {
+		if cmd.ColorMap, err = buf.ReadByte(); err != nil {
+			return nil, err
+		}
+	}
+
+	if bits16&protocol.NQUSkin != 0 {
+		if cmd.Skin, err = buf.ReadByte(); err != nil {
+			return nil, err
+		}
+	}
+
+	if bits16&protocol.NQUEffects != 0 {
+		if cmd.Effects, err = buf.ReadByte(); err != nil {
+			return nil, err
+		}
+	}
+
+	if bits16&protocol.NQUOrigin1 != 0 {
+		if cmd.Origin[0], err = buf.GetCoord16(); err != nil {
+			return nil, err
+		}
+	}
+
+	if bits16&protocol.NQUAngle1 != 0 {
+		if cmd.Angle[0], err = buf.GetAngle8(); err != nil {
+			return nil, err
+		}
+	}
+
+	if bits16&protocol.NQUOrigin2 != 0 {
+		if cmd.Origin[1], err = buf.GetCoord16(); err != nil {
+			return nil, err
+		}
+	}
+
+	if bits16&protocol.NQUAngle2 != 0 {
+		if cmd.Angle[1], err = buf.GetAngle8(); err != nil {
+			return nil, err
+		}
+	}
+
+	if bits16&protocol.NQUOrigin3 != 0 {
+		if cmd.Origin[2], err = buf.GetCoord16(); err != nil {
+			return nil, err
+		}
+	}
+
+	if bits16&protocol.NQUAngle3 != 0 {
+		if cmd.Angle[2], err = buf.GetAngle8(); err != nil {
+			return nil, err
+		}
+	}
+
+	return &cmd, nil
+}