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tree_node.go
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tree_node.go
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// Licensed to the Apache Software Foundation (ASF) under one or more
// contributor license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright ownership.
// The ASF licenses this file to You 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 git
import (
"bytes"
"errors"
"fmt"
"strconv"
)
type treeNode struct {
name string
mode ObjectMode
hash Hash
}
func parseTreeNode(data []byte) (*treeNode, error) {
/*
data is in the format
<mode><space><name>\0<hash>
*/
modeAndName, hash, found := bytes.Cut(data, []byte{0})
if !found {
return nil, errors.New("parse tree node")
}
parsedHash, err := newHashFromBytes(hash)
if err != nil {
return nil, fmt.Errorf("parse tree node hash: %w", err)
}
mode, name, found := bytes.Cut(modeAndName, []byte{' '})
if !found {
return nil, errors.New("parse tree node")
}
parsedFileMode, err := parseObjectMode(mode)
if err != nil {
return nil, fmt.Errorf("parse tree node object mode: %w", err)
}
return &treeNode{
hash: parsedHash,
name: string(name),
mode: parsedFileMode,
}, nil
}
func (e *treeNode) Name() string {
return e.name
}
func (e *treeNode) Mode() ObjectMode {
return e.mode
}
func (e *treeNode) Hash() Hash {
return e.hash
}
// decodes the octal form of a object mode into one of the valid Mode* values.
func parseObjectMode(data []byte) (ObjectMode, error) {
mode, err := strconv.ParseUint(string(data), 8, 32)
if err != nil {
return 0, err
}
switch ObjectMode(mode) {
case ModeFile:
case ModeExe:
case ModeDir:
case ModeSymlink:
case ModeSubmodule:
default:
return 0, fmt.Errorf("unknown object mode: %o", mode)
}
return ObjectMode(mode), nil
}