Change no_lzma and no_lzo to no_obsolete and no_gpl

Added build tags section to README

internal/decompress/get_decomp_no_obsolete.go

@@ -0,0 +1,34 @@
+//go:build no_gpl && no_obsolete
+
+package decompress
+
+import "errors"
+
+// The types of compression supported by squashfs
+const (
+	ZlibCompression = uint16(iota + 1)
+	LZMACompression
+	LZOCompression
+	XZCompression
+	LZ4Compression
+	ZSTDCompression
+)
+
+func GetDecompressor(compType uint16) (Decompressor, error) {
+	switch compType {
+	case ZlibCompression:
+		return Zlib{}, nil
+	case LZMACompression:
+		return nil, errors.New("lzma compression is disable in this build with no_obsolete")
+	case LZOCompression:
+		return nil, errors.New("lzo compression is disable in this build with no_gpl")
+	case XZCompression:
+		return Xz{}, nil
+	case LZ4Compression:
+		return Lz4{}, nil
+	case ZSTDCompression:
+		return &Zstd{}, nil
+	default:
+		return nil, errors.New("invalid compression type. possible corrupted archive")
+	}
+}