tools: Add a function to obtain the size of a file

This will be used in mkimage when working out the required size of the FIT
based on the files to be placed into it.

Signed-off-by: Simon Glass <sjg@chromium.org>

2 files changed, 34 insertions, 0 deletions

diff --git a/tools/imagetool.c b/tools/imagetool.c
index 4b0b73db52..351211cd53 100644
--- a/tools/imagetool.c
+++ b/tools/imagetool.c
@@ -91,3 +91,25 @@ int imagetool_save_subimage(
 
 	return 0;
 }
+
+int imagetool_get_filesize(struct image_tool_params *params, const char *fname)
+{
+	struct stat sbuf;
+	int fd;
+
+	fd = open(fname, O_RDONLY | O_BINARY);
+	if (fd < 0) {
+		fprintf(stderr, "%s: Can't open %s: %s\n",
+			params->cmdname, fname, strerror(errno));
+		return -1;
+	}
+
+	if (fstat(fd, &sbuf) < 0) {
+		fprintf(stderr, "%s: Can't stat %s: %s\n",
+			params->cmdname, fname, strerror(errno));
+		return -1;
+	}
+	close(fd);
+
+	return sbuf.st_size;
+}
diff --git a/tools/imagetool.h b/tools/imagetool.h
index e0397f7716..3cf42ac96a 100644
--- a/tools/imagetool.h
+++ b/tools/imagetool.h
@@ -181,6 +181,18 @@ int imagetool_save_subimage(
 	ulong file_data,
 	ulong file_len);
 
+/**
+ * imagetool_get_filesize() - Utility function to obtain the size of a file
+ *
+ * This function prints a message if an error occurs, showing the error that
+ * was obtained.
+ *
+ * @params:	mkimage parameters
+ * @fname:	filename to check
+ * @return size of file, or -ve value on error
+ */
+int imagetool_get_filesize(struct image_tool_params *params, const char *fname);
+
 /*
  * There is a c file associated with supported image type low level code
  * for ex. default_image.c, fit_image.c