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iaca.go
57 lines (49 loc) · 981 Bytes
/
iaca.go
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package main
import (
"bufio"
"encoding/hex"
"log"
"os"
"strings"
"github.com/zeebo/errs"
)
const (
iacaStart = "\xbb\x6f\x00\x00\x00\x64\x67\x90"
iacaEnd = "\xbb\xde\x00\x00\x00\x64\x67\x90"
)
func main() {
if err := run(); err != nil {
log.Fatalf("%+v", err)
}
}
func run() (err error) {
if _, err := os.Stdout.WriteString(iacaStart); err != nil {
return errs.Wrap(err)
}
sc := bufio.NewScanner(os.Stdin)
for sc.Scan() {
parts := strings.Fields(sc.Text())
if len(parts) == 0 {
continue
} else if len(parts) < 3 {
return errs.New("invalid line: %q", sc.Text())
}
if parts[0] == "TEXT" {
continue
}
data, err := hex.DecodeString(parts[2])
if err != nil {
return errs.Wrap(err)
}
if _, err := os.Stdout.Write(data); err != nil {
return errs.Wrap(err)
}
}
if err := sc.Err(); err != nil {
return errs.Wrap(err)
}
if _, err := os.Stdout.WriteString(iacaEnd); err != nil {
return errs.Wrap(err)
}
return nil
}