cbfstool: Use cbfs_image API for "extract" command.

Change the "extract" command to use cbfs_export_entry API. Nothing changed in
its usage.

To verify, run "cbfstool coreboot.rom extract -f blah -n blah" and check if the
raw type file is correctly extracted.

Change-Id: I1ed280d47a2224a9d1213709f6b459b403ce5055
Signed-off-by: Hung-Te Lin <hungte@chromium.org>
Reviewed-on: http://review.coreboot.org/2207
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
diff --git a/util/cbfstool/cbfstool.c b/util/cbfstool/cbfstool.c
index d70f757..9d22552 100644
--- a/util/cbfstool/cbfstool.c
+++ b/util/cbfstool/cbfstool.c
@@ -401,8 +401,8 @@
 
 static int cbfs_extract(void)
 {
-	void *rom;
-	int ret;
+	int result = 0;
+	struct cbfs_image image;
 
 	if (!param.filename) {
 		ERROR("You need to specify -f/--filename.\n");
@@ -414,17 +414,17 @@
 		return 1;
 	}
 
-	rom = loadrom(param.cbfs_name);
-	if (rom == NULL) {
+	if (cbfs_image_from_file(&image, param.cbfs_name) != 0) {
 		ERROR("Could not load ROM image '%s'.\n",
 			param.cbfs_name);
-		return 1;
+		result = 1;
+	} else if (cbfs_export_entry(&image, param.name,
+				     param.filename) != 0) {
+		result = 1;
 	}
 
-	ret = extract_file_from_cbfs(param.cbfs_name, param.name, param.filename);
-
-	free(rom);
-	return ret;
+	cbfs_image_delete(&image);
+	return result;
 }
 
 static const struct command commands[] = {