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>

4 files changed, 12 insertions, 0 deletions

diff --git a/include/ext4fs.h b/include/ext4fs.h
index fbbb002..6c419f3 100644
--- a/include/ext4fs.h
+++ b/include/ext4fs.h
@@ -136,6 +136,7 @@ void ext4fs_close(void);
 void ext4fs_reinit_global(void);
 int ext4fs_ls(const char *dirname);
 int ext4fs_exists(const char *filename);
+int ext4fs_size(const char *filename);
 void ext4fs_free_node(struct ext2fs_node *node, struct ext2fs_node *currroot);
 int ext4fs_devread(lbaint_t sector, int byte_offset, int byte_len, char *buf);
 void ext4fs_set_blk_dev(block_dev_desc_t *rbdd, disk_partition_t *info);
diff --git a/include/fat.h b/include/fat.h
index 63cf787..20ca3f3 100644
--- a/include/fat.h
+++ b/include/fat.h
@@ -198,6 +198,7 @@ int file_cd(const char *path);
 int file_fat_detectfs(void);
 int file_fat_ls(const char *dir);
 int fat_exists(const char *filename);
+int fat_size(const char *filename);
 long file_fat_read_at(const char *filename, unsigned long pos, void *buffer,
 		      unsigned long maxsize);
 long file_fat_read(const char *filename, void *buffer, unsigned long maxsize);
diff --git a/include/fs.h b/include/fs.h
index 26de053..06a45f2 100644
--- a/include/fs.h
+++ b/include/fs.h
@@ -51,6 +51,13 @@ int fs_ls(const char *dirname);
 int fs_exists(const char *filename);
 
 /*
+ * Determine a file's size
+ *
+ * Returns the file's size in bytes, or a negative value if it doesn't exist.
+ */
+int fs_size(const char *filename);
+
+/*
  * Read file "filename" from the partition previously set by fs_set_blk_dev(),
  * to address "addr", starting at byte offset "offset", and reading "len"
  * bytes. "offset" may be 0 to read from the start of the file. "len" may be
@@ -75,6 +82,8 @@ int fs_write(const char *filename, ulong addr, int offset, int len);
  * Common implementation for various filesystem commands, optionally limited
  * to a specific filesystem type via the fstype parameter.
  */
+int do_size(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[],
+		int fstype);
 int do_load(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[],
 		int fstype);
 int do_ls(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[],
diff --git a/include/sandboxfs.h b/include/sandboxfs.h
index a51ad13..e7c3262 100644
--- a/include/sandboxfs.h
+++ b/include/sandboxfs.h
@@ -26,6 +26,7 @@ long sandbox_fs_read_at(const char *filename, unsigned long pos,
 void sandbox_fs_close(void);
 int sandbox_fs_ls(const char *dirname);
 int sandbox_fs_exists(const char *filename);
+int sandbox_fs_size(const char *filename);
 int fs_read_sandbox(const char *filename, void *buf, int offset, int len);
 int fs_write_sandbox(const char *filename, void *buf, int offset, int len);