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73 lines
1.8 KiB
Go

8 years ago
package main
import (
"fmt"
"github.com/golang/protobuf/proto"
"github.com/golang/snappy"
"github.com/jordanorelli/hyperstone/bit"
"github.com/jordanorelli/hyperstone/dota"
)
// datagram represents the top-level envelope in the dota replay format. All
// data in the replay file is packed into datagram frames of at most 65kb.
type dataGram struct {
cmd dota.EDemoCommands
tick int64
compressed bool
body []byte
}
func (g dataGram) String() string {
if len(g.body) > 30 {
return fmt.Sprintf("{dataGram cmd: %v tick: %v compressed: %t size: %d body: %q...}", g.cmd, g.tick, g.compressed, len(g.body), g.body[:27])
}
return fmt.Sprintf("{dataGram cmd: %v tick: %v compressed: %t size: %d body: %q}", g.cmd, g.tick, g.compressed, len(g.body), g.body)
}
func (g *dataGram) check(dump bool) error {
if g.cmd != dota.EDemoCommands_DEM_Packet {
return fmt.Errorf("wrong command type in openPacket: %v", g.cmd)
}
if g.compressed {
buf, err := snappy.Decode(nil, g.body)
if err != nil {
return wrap(err, "open packet error: could not decode body")
}
g.body = buf
g.compressed = false
}
packet := new(dota.CDemoPacket)
if err := proto.Unmarshal(g.body, packet); err != nil {
return wrap(err, "onPacket unable to unmarshal message body")
}
if dump {
br := bit.NewBytesReader(packet.GetData())
for {
t := br.ReadUBitVar()
s := br.ReadVarInt()
b := make([]byte, s)
br.Read(b)
if br.Err() != nil {
break
}
fmt.Printf("\t%v\n", entity{t: uint32(t), size: uint32(s), body: b})
e := entFactory.BuildMessage(int(t))
if e == nil {
fmt.Printf("\tno known entity for type id %d\n", int(t))
continue
}
err := proto.Unmarshal(b, e)
if err != nil {
fmt.Printf("entity unmarshal error: %v\n", err)
} else {
fmt.Printf("\t\t%v\n", e)
}
}
}
return nil
}