Adding the challenge 0405

0405/log.go

@@ -0,0 +1,40 @@
+package db0405
+
+import (
+	"io"
+	"os"
+)
+
+type Log struct {
+	FileName string
+	fp       *os.File
+}
+
+func (log *Log) Open() (err error) {
+	log.fp, err = createFileSync(log.FileName)
+	return err
+}
+
+func (log *Log) Close() error {
+	return log.fp.Close()
+}
+
+func (log *Log) Write(ent *Entry) error {
+	if _, err := log.fp.Write(ent.Encode()); err != nil {
+		return err
+	}
+	return log.fp.Sync() // fsync
+}
+
+func (log *Log) Read(ent *Entry) (eof bool, err error) {
+	err = ent.Decode(log.fp)
+	if err == io.EOF || err == io.ErrUnexpectedEOF || err == ErrBadSum {
+		return true, nil
+	} else if err != nil {
+		return false, err
+	} else {
+		return false, nil
+	}
+}
+
+// QzBQWVJJOUhU https://trialofcode.org/