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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
}
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