// Read the next outer message from the buffer.
func (p *Parser) readOuterMessage() (*outerMessage, error) {
// Read a command header, which includes both the message type
// well as a flag to determine whether or not whether or not the
// message is compressed with snappy.
command := dota.EDemoCommands(p.reader.readVarUint32())
// Extract the type and compressed flag out of the command
msgType := int32(command & ^dota.EDemoCommands_DEM_IsCompressed)
msgCompressed := (command & dota.EDemoCommands_DEM_IsCompressed) == dota.EDemoCommands_DEM_IsCompressed
// Read the tick that the message corresponds with.
tick := p.reader.readVarUint32()
// This appears to actually be an int32, where a -1 means pre-game.
if tick == 4294967295 {
tick = 0
}
// Read the size and following buffer.
size := int(p.reader.readVarUint32())
buf := p.reader.readBytes(size)
// If the buffer is compressed, decompress it with snappy.
if msgCompressed {
var err error
if buf, err = snappy.Decode(nil, buf); err != nil {
return nil, err
}
}
// Return the message
msg := &outerMessage{
tick: tick,
typeId: msgType,
data: buf,
}
return msg, nil
}
// readCommand reads a varuint32 as an EDemoCommands
func (s *stream) readCommand() (dota.EDemoCommands, error) {
c, err := s.readVarUint32()
return dota.EDemoCommands(c), err
}