1 files changed, 40 insertions, 0 deletions
diff --git a/object/fetch/treefs_readfile.go b/object/fetch/treefs_readfile.go
new file mode 100644
index 00000000..d3671f07
--- /dev/null
+++ b/object/fetch/treefs_readfile.go
@@ -0,0 +1,40 @@
+package fetch
+
+import (
+	"fmt"
+	"io"
+
+	"codeberg.org/lindenii/furgit/object/tree"
+)
+
+// ReadFile reads the blob contents at name.
+//
+// Directories and gitlink entries are not readable through TreeFS.
+func (treeFS *TreeFS) ReadFile(name string) ([]byte, error) {
+	entry, err := treeFS.resolvePath(treeFSOpReadFile, name)
+	if err != nil {
+		return nil, err
+	}
+
+	if entry.isDir() {
+		return nil, treeFSPathError(treeFSOpReadFile, name, fmt.Errorf("is a directory"))
+	}
+
+	if entry.mode == tree.FileModeGitlink {
+		return nil, treeFSPathError(treeFSOpReadFile, name, fmt.Errorf("object/fetch: gitlink entries are not readable as files"))
+	}
+
+	reader, _, err := treeFS.resolver.ExactBlobReader(entry.objectID)
+	if err != nil {
+		return nil, treeFSPathError(treeFSOpReadFile, name, err)
+	}
+
+	defer func() { _ = reader.Close() }()
+
+	data, err := io.ReadAll(reader)
+	if err != nil {
+		return nil, treeFSPathError(treeFSOpReadFile, name, err)
+	}
+
+	return data, nil
+}