1 files changed, 96 insertions, 0 deletions
diff --git a/modules/git/parse_gogit.go b/modules/git/parse_gogit.go
new file mode 100644
index 00000000..74d258de
--- /dev/null
+++ b/modules/git/parse_gogit.go
@@ -0,0 +1,96 @@
+// Copyright 2018 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+//go:build gogit
+
+package git
+
+import (
+	"bytes"
+	"fmt"
+	"strconv"
+	"strings"
+
+	"github.com/go-git/go-git/v5/plumbing"
+	"github.com/go-git/go-git/v5/plumbing/filemode"
+	"github.com/go-git/go-git/v5/plumbing/hash"
+	"github.com/go-git/go-git/v5/plumbing/object"
+)
+
+// ParseTreeEntries parses the output of a `git ls-tree -l` command.
+func ParseTreeEntries(data []byte) ([]*TreeEntry, error) {
+	return parseTreeEntries(data, nil)
+}
+
+func parseTreeEntries(data []byte, ptree *Tree) ([]*TreeEntry, error) {
+	entries := make([]*TreeEntry, 0, 10)
+	for pos := 0; pos < len(data); {
+		// expect line to be of the form "<mode> <type> <sha> <space-padded-size>\t<filename>"
+		entry := new(TreeEntry)
+		entry.gogitTreeEntry = &object.TreeEntry{}
+		entry.ptree = ptree
+		if pos+6 > len(data) {
+			return nil, fmt.Errorf("Invalid ls-tree output: %s", string(data))
+		}
+		switch string(data[pos : pos+6]) {
+		case "100644":
+			entry.gogitTreeEntry.Mode = filemode.Regular
+			pos += 12 // skip over "100644 blob "
+		case "100755":
+			entry.gogitTreeEntry.Mode = filemode.Executable
+			pos += 12 // skip over "100755 blob "
+		case "120000":
+			entry.gogitTreeEntry.Mode = filemode.Symlink
+			pos += 12 // skip over "120000 blob "
+		case "160000":
+			entry.gogitTreeEntry.Mode = filemode.Submodule
+			pos += 14 // skip over "160000 object "
+		case "040000":
+			entry.gogitTreeEntry.Mode = filemode.Dir
+			pos += 12 // skip over "040000 tree "
+		default:
+			return nil, fmt.Errorf("unknown type: %v", string(data[pos:pos+6]))
+		}
+
+		// in hex format, not byte format ....
+		if pos+hash.Size*2 > len(data) {
+			return nil, fmt.Errorf("Invalid ls-tree output: %s", string(data))
+		}
+		var err error
+		entry.ID, err = NewIDFromString(string(data[pos : pos+hash.Size*2]))
+		if err != nil {
+			return nil, fmt.Errorf("invalid ls-tree output: %w", err)
+		}
+		entry.gogitTreeEntry.Hash = plumbing.Hash(entry.ID.RawValue())
+		pos += 41 // skip over sha and trailing space
+
+		end := pos + bytes.IndexByte(data[pos:], '\t')
+		if end < pos {
+			return nil, fmt.Errorf("Invalid ls-tree -l output: %s", string(data))
+		}
+		entry.size, _ = strconv.ParseInt(strings.TrimSpace(string(data[pos:end])), 10, 64)
+		entry.sized = true
+
+		pos = end + 1
+
+		end = pos + bytes.IndexByte(data[pos:], '\n')
+		if end < pos {
+			return nil, fmt.Errorf("Invalid ls-tree output: %s", string(data))
+		}
+
+		// In case entry name is surrounded by double quotes(it happens only in git-shell).
+		if data[pos] == '"' {
+			var err error
+			entry.gogitTreeEntry.Name, err = strconv.Unquote(string(data[pos:end]))
+			if err != nil {
+				return nil, fmt.Errorf("Invalid ls-tree output: %w", err)
+			}
+		} else {
+			entry.gogitTreeEntry.Name = string(data[pos:end])
+		}
+
+		pos = end + 1
+		entries = append(entries, entry)
+	}
+	return entries, nil
+}