Zstandard: read .tar.zst files

  $ tar cafv ~/test.tar.zst ~/test
  $ xdg-mime query filetype ~/test.tar.zst
  application/x-zstd-compressed-tar

Test:

  $ CFLAGS="-g -O0" ./autogen.sh --enable-magic --enable-packagekit --prefix=/usr && make && sudo make install
  $ engrampa ~/test.tar.zst

1 files changed, 20 insertions, 0 deletions

diff --git a/src/fr-command-tar.c b/src/fr-command-tar.c
index 3c47399..ffa911d 100644
--- a/src/fr-command-tar.c
+++ b/src/fr-command-tar.c
@@ -827,6 +827,11 @@ get_uncompressed_name (FrCommandTar *c_tar,
 		if (file_extension_is (e_filename, ".tar.7z"))
 			new_name[l - 3] = 0;
 	}
+	else if (is_mime_type (comm->mime_type, "application/x-zstd-compressed-tar")) {
+		/* X.tar.zst -->  X.tar */
+		if (file_extension_is (e_filename, ".tar.zst"))
+			new_name[l - 4] = 0;
+	}
 
 	return new_name;
 }
@@ -980,6 +985,14 @@ fr_command_tar_uncompress (FrCommand *comm)
 			fr_process_add_arg (comm->process, tmp_name);
 			fr_process_end_command (comm->process);
 		}
+		else if (is_mime_type (comm->mime_type, "application/x-zstd-compressed-tar")) {
+			fr_process_begin_command (comm->process, "zstd");
+			fr_process_set_begin_func (comm->process, begin_func__uncompress, comm);
+			fr_process_add_arg (comm->process, "-f");
+			fr_process_add_arg (comm->process, "-d");
+			fr_process_add_arg (comm->process, tmp_name);
+			fr_process_end_command (comm->process);
+		}
 	}
 
 	c_tar->uncomp_filename = get_uncompressed_name (c_tar, tmp_name);
@@ -1009,6 +1022,7 @@ const char *tar_mime_types[] = { "application/x-compressed-tar",
 			         "application/x-lzop-compressed-tar",
 			         "application/x-tarz",
 				 "application/x-xz-compressed-tar",
+				 "application/x-zstd-compressed-tar",
 			         NULL };
 
 
@@ -1084,6 +1098,10 @@ fr_command_tar_get_capabilities (FrCommand  *comm,
 			}
 		}
 	}
+	else if (is_mime_type (mime_type, "application/x-zstd-compressed-tar")) {
+		if (is_program_available ("zstd", check_command))
+			capabilities |= FR_COMMAND_CAN_READ;
+	}
 
 	return capabilities;
 }
@@ -1137,6 +1155,8 @@ fr_command_tar_get_packages (FrCommand  *comm,
 		return PACKAGES ("tar,lzop");
 	else if (is_mime_type (mime_type, "application/x-7z-compressed-tar"))
 		return PACKAGES ("tar,p7zip");
+	else if (is_mime_type (mime_type, "application/x-zstd-compressed-tar"))
+		return PACKAGES ("tar,zstd");
 
 	return NULL;
 }