Check if zlib is compatible.
Add a --zlib_fingerprint flag in delta_generator to check if the zlib of
source image is compatible, and only enable IMGDIFF operation if it is.
Test: Added unittest to check /etc/zlib_fingerprint
Bug: 27156099
Change-Id: Ida346a99430c95cdc8a43e1055d6efa08f07ca25
diff --git a/common/utils.h b/common/utils.h
index df06ef1..55d8a80 100644
--- a/common/utils.h
+++ b/common/utils.h
@@ -343,6 +343,9 @@
bool GetMinorVersion(const brillo::KeyValueStore& store,
uint32_t* minor_version);
+// Returns whether zlib |fingerprint| is compatible with zlib we are using.
+bool IsZlibCompatible(const std::string& fingerprint);
+
// This function reads the specified data in |extents| into |out_data|. The
// extents are read from the file at |path|. |out_data_size| is the size of
// |out_data|. Returns false if the number of bytes to read given in