fs: implement size/fatsize/ext4size

These commands may be used to determine the size of a file without
actually reading the whole file content into memory. This may be used
to determine if the file will fit into the memory buffer that will
contain it. In particular, the DFU code will use it for this purpose
in the next commit.

Signed-off-by: Stephen Warren <swarren@nvidia.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/fs/sandbox/sandboxfs.c b/fs/sandbox/sandboxfs.c
index 8507978..ba6402c 100644
--- a/fs/sandbox/sandboxfs.c
+++ b/fs/sandbox/sandboxfs.c
@@ -80,6 +80,11 @@ int sandbox_fs_exists(const char *filename)
 	return sz >= 0;
 }
 
+int sandbox_fs_size(const char *filename)
+{
+	return os_get_filesize(filename);
+}
+
 void sandbox_fs_close(void)
 {
 }