small refactor*

plugins/archive/rar.go

@@ -0,0 +1,67 @@
+package archive
+
+import (
+	"context"
+	"fmt"
+	"io"
+
+	"git.kmsign.ru/royalcat/tstor/server/pkg/ioutils"
+	"git.kmsign.ru/royalcat/tstor/server/src/vfs"
+	"github.com/nwaples/rardecode/v2"
+	"github.com/royalcat/ctxio"
+)
+
+func (d *Daemon) RarLoader(ctx context.Context, archivePath string, f vfs.File, size int64) (map[string]fileEntry, error) {
+	hash, err := vfs.FileHash(ctx, f)
+	if err != nil {
+		return nil, err
+	}
+
+	reader := ioutils.WrapIoReadSeeker(ctx, f, size)
+
+	r, err := rardecode.NewReader(reader)
+	if err != nil {
+		return nil, err
+	}
+
+	out := make(map[string]fileEntry)
+	for {
+		header, err := r.Next()
+		if err == io.EOF {
+			break
+		}
+		if err != nil {
+			return nil, err
+		}
+
+		name := header.Name
+		af := func(ctx context.Context) (ctxio.ReadCloser, error) {
+			reader := ioutils.WrapIoReadSeeker(ctx, f, size)
+			r, err := rardecode.NewReader(reader)
+			if err != nil {
+				return nil, err
+			}
+
+			for header, err := r.Next(); err != io.EOF; header, err = r.Next() {
+				if err != nil {
+					return nil, err
+				}
+				if header.Name == name {
+					return ctxio.NopCloser(ctxio.WrapIoReader(r)), nil
+				}
+			}
+			return nil, fmt.Errorf("file with name '%s' not found", name)
+		}
+
+		rr := newRandomReaderFromLinear(d.blockcache, archiveFileIndex{archiveHash: hash, filename: header.Name}, header.UnPackedSize, af)
+
+		out[vfs.AbsPath(header.Name)] = fileEntry{
+			FileInfo: vfs.NewFileInfo(header.Name, header.UnPackedSize, header.ModificationTime),
+			open: func(ctx context.Context) (vfs.File, error) {
+				return newArchiveFile(header.Name, header.UnPackedSize, rr), nil
+			},
+		}
+	}
+
+	return out, nil
+}