1 files changed, 90 insertions, 0 deletions
diff --git a/packet/command/download/download.go b/packet/command/download/download.go
new file mode 100644
index 0000000..0872f6f
--- /dev/null
+++ b/packet/command/download/download.go
@@ -0,0 +1,90 @@
+package download
+
+import (
+	"github.com/osm/quake/common/buffer"
+	"github.com/osm/quake/common/context"
+	"github.com/osm/quake/protocol"
+	"github.com/osm/quake/protocol/fte"
+)
+
+type Command struct {
+	FTEProtocolExtension uint32
+
+	Size16  int16
+	Size32  int32
+	Percent byte
+	Number  int32
+	Name    string
+	Data    []byte
+}
+
+func (cmd *Command) Bytes() []byte {
+	buf := buffer.New()
+
+	buf.PutByte(protocol.SVCDownload)
+
+	if cmd.FTEProtocolExtension&fte.ExtensionChunkedDownloads != 0 {
+		buf.PutInt32(cmd.Number)
+
+		if cmd.Number == -1 {
+			buf.PutInt32(cmd.Size32)
+			buf.PutString(cmd.Name)
+		} else {
+			buf.PutBytes(cmd.Data)
+		}
+	} else {
+		buf.PutInt16(cmd.Size16)
+		buf.PutByte(cmd.Percent)
+
+		if cmd.Size16 != -1 {
+			buf.PutBytes(cmd.Data)
+		}
+	}
+
+	return buf.Bytes()
+}
+
+func Parse(ctx *context.Context, buf *buffer.Buffer) (*Command, error) {
+	var err error
+	var cmd Command
+
+	cmd.FTEProtocolExtension = ctx.GetFTEProtocolExtension()
+
+	if cmd.FTEProtocolExtension&fte.ExtensionChunkedDownloads != 0 {
+		if cmd.Number, err = buf.GetInt32(); err != nil {
+			return nil, err
+		}
+
+		if cmd.Number < 0 {
+			if cmd.Size32, err = buf.GetInt32(); err != nil {
+				return nil, err
+			}
+
+			if cmd.Name, err = buf.GetString(); err != nil {
+				return nil, err
+			}
+
+			return &cmd, nil
+		}
+
+		if cmd.Data, err = buf.GetBytes(protocol.DownloadBlockSize); err != nil {
+			return nil, err
+		}
+	} else {
+		if cmd.Size16, err = buf.GetInt16(); err != nil {
+			return nil, err
+		}
+
+		if cmd.Percent, err = buf.ReadByte(); err != nil {
+			return nil, err
+		}
+
+		if cmd.Size16 > 0 {
+			if cmd.Data, err = buf.GetBytes(int(cmd.Size16)); err != nil {
+				return nil, err
+			}
+		}
+	}
+
+	return &cmd, nil
+}