Add support for compression in //third_party/ijar:zipper

Add the 'C' flag to //third_party/ijar:zipper to try to compress
files using the DEFLATE algorithm. To avoid regression, creation
of uncompressed ZIP files is still the default.

--
Change-Id: I8ad7182d8f6f152abd56ae472a406cbb8d39fb64
Reviewed-on: https://bazel-review.googlesource.com/#/c/1821/
MOS_MIGRATED_REVID=101925953

1 files changed, 3 insertions, 2 deletions

diff --git a/third_party/ijar/zip.h b/third_party/ijar/zip.h
index 046072d25a..c548cb3cdb 100644
--- a/third_party/ijar/zip.h
+++ b/third_party/ijar/zip.h
@@ -61,9 +61,10 @@ class ZipBuilder {
   virtual u1* NewFile(const char* filename, const u4 attr) = 0;
 
   // Finish writing a file and specify its length. After calling this method
-  // one should not reuse the pointer given by NewFile.
+  // one should not reuse the pointer given by NewFile. The file can be
+  // compressed using the deflate algorithm by setting `compress` to true.
   // On failure, returns -1 and GetError() will return an non-empty message.
-  virtual int FinishFile(size_t filelength) = 0;
+  virtual int FinishFile(size_t filelength, bool compress = false) = 0;
 
   // Write an empty file, it is equivalent to:
   //   NewFile(filename, 0);