AU: delta compress the kernel partition
Add kernel partition to proto buf. Change delta generator to compress
the kernel partition and the delta performer to perform operations to
update the kernel partition. Update unittests to test it.
Also, remove checksums from the protobuf while we're at it, since the
partitions themselves will contains checksums.
BUG=None
TEST=Attached unittest
Review URL: http://codereview.chromium.org/1819002
diff --git a/utils.h b/utils.h
index 7b6fc10..7983eec 100644
--- a/utils.h
+++ b/utils.h
@@ -36,6 +36,10 @@
bool ReadFile(const std::string& path, std::vector<char>* out);
bool ReadFileToString(const std::string& path, std::string* out);
+// Returns the size of the file at path. If the file doesn't exist or some
+// error occurrs, -1 is returned.
+off_t FileSize(const std::string& path);
+
std::string ErrnoNumberAsString(int err);
// Strips duplicate slashes, and optionally removes all trailing slashes.