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package main
import (
"errors"
"fmt"
"os"
"strings"
"github.com/pektezol/bitreader"
"github.com/pektezol/sdp.go/pkg/packets"
"github.com/pektezol/sdp.go/pkg/writer"
)
type Demo struct {
Headers packets.Headers `json:"headers"`
Messages []packets.Message `json:"messages"`
}
type Parser struct {
DemoPath string
writer strings.Builder
}
func NewParser(demoPath string) *Parser {
return &Parser{
DemoPath: demoPath,
}
}
const littleEndian bool = true
func main() {
if len(os.Args) != 2 {
fmt.Println("specify file in command line arguments")
os.Exit(1)
}
parser := NewParser(os.Args[1])
_, err := parser.ParseDemos()
if err != nil {
fmt.Println(err.Error())
os.Exit(1)
}
fmt.Println(parser.GetOutput())
}
func (p *Parser) GetOutput() string {
return p.writer.String()
}
func (p *Parser) ParseDemos() ([]Demo, error) {
writer.AppendLine("Generated By: github.com/pektezol/sdp.go")
files, err := os.ReadDir(p.DemoPath)
if err != nil {
// not a directory
file, err := os.Open(p.DemoPath)
if err != nil {
return []Demo{}, err
}
defer file.Close()
reader := bitreader.NewReader(file, littleEndian)
demo := demoParserHandler(reader, file.Name())
p.writer = writer.GetWriter()
return []Demo{demo}, nil
} else {
demos := []Demo{}
// directory
for _, fileinfo := range files {
if len(fileinfo.Name()) > 4 && fileinfo.Name()[len(fileinfo.Name())-4:] == ".dem" {
file, err := os.Open(p.DemoPath + fileinfo.Name())
if err != nil {
return []Demo{}, err
}
defer file.Close()
reader := bitreader.NewReader(file, littleEndian)
demo := demoParserHandler(reader, file.Name())
demos = append(demos, demo)
}
}
p.writer = writer.GetWriter()
if len(demos) == 0 {
return demos, errors.New("no demo found in given directory")
}
return demos, nil
}
}
func demoParserHandler(reader *bitreader.Reader, filename string) Demo {
demo := Demo{}
writer.AppendLine("\nFile Name: %s", filename)
// this is for recovering after a panic inside parse headers and packet.
// this approach was taken since error handling bitreader functions would take a long time.
defer func() {
if err := recover(); err != nil {
writer.AppendLine("failed to parse demo: %v", err)
}
}()
demo.Headers = packets.ParseHeaders(reader)
for {
message := packets.ParseMessage(reader)
demo.Messages = append(demo.Messages, message)
if message.PacketType == 7 {
break
}
}
return demo
}
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