language change

language-change/excel-language/row.go

@@ -0,0 +1,81 @@
+package excelLanguage
+
+import (
+	"bytes"
+	"errors"
+)
+
+type LanguageRow struct {
+	Area            *string
+	Type            *uint8
+	LanguageList    []string
+	DefaultLanguage *string
+}
+
+func (r *LanguageRow) Unmarshal() ([]byte, error) {
+	buf := new(bytes.Buffer)
+
+	var bitmask uint8
+	if r.Area != nil {
+		bitmask |= 1 << 0
+	}
+	if r.Type != nil {
+		bitmask |= 1 << 1
+	}
+	if len(r.LanguageList) > 0 {
+		bitmask |= 1 << 2
+	}
+	if r.DefaultLanguage != nil {
+		bitmask |= 1 << 3
+	}
+
+	if err := buf.WriteByte(bitmask); err != nil {
+		return nil, err
+	}
+
+	if r.Area != nil {
+		if err := writeString(buf, *r.Area); err != nil {
+			return nil, err
+		}
+	}
+	if r.Type != nil {
+		if err := buf.WriteByte(*r.Type); err != nil {
+			return nil, err
+		}
+	}
+	if len(r.LanguageList) > 0 {
+		if err := writeStringArray(buf, r.LanguageList); err != nil {
+			return nil, err
+		}
+	}
+	if r.DefaultLanguage != nil {
+		if err := writeString(buf, *r.DefaultLanguage); err != nil {
+			return nil, err
+		}
+	}
+
+	return buf.Bytes(), nil
+}
+
+func writeString(buf *bytes.Buffer, s string) error {
+	if len(s) > 255 {
+		return errors.New("string too long")
+	}
+	if err := buf.WriteByte(uint8(len(s))); err != nil {
+		return err
+	}
+	_, err := buf.Write([]byte(s))
+	return err
+}
+
+func writeStringArray(buf *bytes.Buffer, arr []string) error {
+	if err := writeI8Varint(buf, int8(len(arr))); err != nil {
+		return err
+	}
+	for _, s := range arr {
+		if err := writeString(buf, s); err != nil {
+			return err
+		}
+	}
+	return nil
+}