[file-roller] libarchive: Add support for Zstandard compressed tar archives

[Paolo Bacchilega <paobac src gnome org>]

commit 5f009cc3ee2f2ec16aa668fe1337c1fd0f72c2ec
Author: Felix Riemann <friemann gnome org>
Date:   Sat Feb 2 20:53:03 2019 +0100

    libarchive: Add support for Zstandard compressed tar archives
    
    This requires at least libarchive 3.3.3.

 src/fr-archive-libarchive.c | 61 +++++++++++++++++++++++++++++++++++----------
 1 file changed, 48 insertions(+), 13 deletions(-)
---
diff --git a/src/fr-archive-libarchive.c b/src/fr-archive-libarchive.c
index 1d451648..b1178f71 100644
--- a/src/fr-archive-libarchive.c
+++ b/src/fr-archive-libarchive.c
@@ -90,6 +90,9 @@ const char *libarchiver_mime_types[] = {
        "application/x-tarz",
        "application/x-xar",
        "application/x-xz-compressed-tar",
+#if (ARCHIVE_VERSION_NUMBER >= 3003003)
+       "application/x-zstd-compressed-tar",
+#endif
        "application/zip",
        NULL
 };
@@ -1171,6 +1174,12 @@ _archive_write_set_format_from_context (struct archive *a,
                archive_write_set_format_pax_restricted (a);
                archive_filter = ARCHIVE_FILTER_XZ;
        }
+#if (ARCHIVE_VERSION_NUMBER >= 3003003)
+       else if (_g_str_equal (mime_type, "application/x-zstd-compressed-tar")) {
+               archive_write_set_format_pax_restricted (a);
+               archive_filter = ARCHIVE_FILTER_ZSTD;
+       }
+#endif
        else if (_g_str_equal (mime_type, "application/x-tar")) {
                archive_write_add_filter_none (a);
                archive_write_set_format_pax_restricted (a);
@@ -1225,6 +1234,11 @@ _archive_write_set_format_from_context (struct archive *a,
                case ARCHIVE_FILTER_XZ:
                        archive_write_add_filter_xz (a);
                        break;
+#if (ARCHIVE_VERSION_NUMBER >= 3003003)
+               case ARCHIVE_FILTER_ZSTD:
+                       archive_write_add_filter_zstd (a);
+                       break;
+#endif
                default:
                        break;
                }
@@ -1232,19 +1246,40 @@ _archive_write_set_format_from_context (struct archive *a,
                /* set the compression level */
 
                compression_level = NULL;
-               switch (save_data->compression) {
-               case FR_COMPRESSION_VERY_FAST:
-                       compression_level = "1";
-                       break;
-               case FR_COMPRESSION_FAST:
-                       compression_level = "3";
-                       break;
-               case FR_COMPRESSION_NORMAL:
-                       compression_level = "6";
-                       break;
-               case FR_COMPRESSION_MAXIMUM:
-                       compression_level = "9";
-                       break;
+#if (ARCHIVE_VERSION_NUMBER >= 3003003)
+               if (archive_filter == ARCHIVE_FILTER_ZSTD) {
+                       switch (save_data->compression) {
+                       case FR_COMPRESSION_VERY_FAST:
+                               compression_level = "1";
+                               break;
+                       case FR_COMPRESSION_FAST:
+                               compression_level = "2";
+                               break;
+                       case FR_COMPRESSION_NORMAL:
+                               compression_level = "3";
+                               break;
+                       case FR_COMPRESSION_MAXIMUM:
+                               compression_level = "22";
+                               break;
+                       }
+               }
+               else
+#endif
+               {
+                       switch (save_data->compression) {
+                       case FR_COMPRESSION_VERY_FAST:
+                               compression_level = "1";
+                               break;
+                       case FR_COMPRESSION_FAST:
+                               compression_level = "3";
+                               break;
+                       case FR_COMPRESSION_NORMAL:
+                               compression_level = "6";
+                               break;
+                       case FR_COMPRESSION_MAXIMUM:
+                               compression_level = "9";
+                               break;
+                       }
                }
                if (compression_level != NULL)
                        archive_write_set_filter_option (a, NULL, "compression-level", compression_level);