mv x/<tool> => xtool/<tool>

xtool/ar/common.go

@@ -0,0 +1,60 @@
+/*
+ * Copyright (c) 2024 The GoPlus Authors (goplus.org). All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package ar
+
+import (
+	"errors"
+	"time"
+)
+
+var (
+	errInvalidHeader = errors.New("ar: invalid header")
+	errWriteTooLong  = errors.New("ar: write too long")
+)
+
+const (
+	globalHeader    = "!<arch>\n"
+	globalHeaderLen = len(globalHeader)
+	headerByteSize  = 60
+)
+
+type recHeader struct {
+	name    [16]byte
+	modTime [12]byte
+	uid     [6]byte
+	gid     [6]byte
+	mode    [8]byte
+	size    [10]byte
+	eol     [2]byte
+}
+
+type Header struct {
+	Name    string
+	ModTime time.Time
+	Uid     int
+	Gid     int
+	Mode    int64
+	Size    int64
+}
+
+type slicer []byte
+
+func (sp *slicer) next(n int) (b []byte) {
+	s := *sp
+	b, *sp = s[0:n], s[n:]
+	return
+}