cbfs: add cbfs_read()
Allow for reading from cbfs media without having a handle
to a non-CBFS_DEFAULT_MEDIA cbfs_media. In conjunction with
cbfs_locate_file() one can locate and cbfs_read() a file
without bringing the entire file through a potentially
temporary buffer (non-memory-mappable cbfs media platforms).
BUG=chrome-os-partner:29922
BRANCH=None
TEST=Built.
Original-Change-Id: Ib5d965334bce1267650fc23c9e9f496675cf8450
Original-Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Original-Reviewed-on: https://chromium-review.googlesource.com/205991
Original-Reviewed-by: Furquan Shaikh <furquan@chromium.org>
(cherry picked from commit 85200f28863e5ea8888322f5787dc6de9a2999f0)
Signed-off-by: Marc Jones <marc.jones@se-eng.com>
Change-Id: I25e3221beefd0155305ad63da6be9f47e756f7d0
Reviewed-on: http://review.coreboot.org/8181
Tested-by: build bot (Jenkins)
Reviewed-by: Furquan Shaikh <furquan@google.com>
diff --git a/src/include/cbfs_core.h b/src/include/cbfs_core.h
index 3cef903..b01a307 100644
--- a/src/include/cbfs_core.h
+++ b/src/include/cbfs_core.h
@@ -224,6 +224,10 @@
ssize_t cbfs_locate_file(struct cbfs_media *media, struct cbfs_file *file,
const char *name);
+/* Read count bytes at offset into dest. Return number of bytes read. */
+size_t cbfs_read(struct cbfs_media *media, void *dest, size_t offset,
+ size_t count);
+
/* returns pointer to a file entry inside CBFS or NULL */
struct cbfs_file *cbfs_get_file(struct cbfs_media *media, const char *name);