zlib: wrap deflate side of the API

Wrap deflateInit, deflate, and deflateEnd for everybody, and the sole use
of deflateInit2 in remote-curl.c to tell the library to use gzip header
and trailer in git_deflate_init_gzip().

There is only one caller that cares about the status from deflateEnd().
Introduce git_deflate_end_gently() to let that sole caller retrieve the
status and act on it (i.e. die) for now, but we would probably want to
make inflate_end/deflate_end die when they ran out of memory and get
rid of the _gently() kind.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/cache.h b/cache.h
index 50f09d05d4..5eb61ac04e 100644
--- a/cache.h
+++ b/cache.h
@@ -25,6 +25,12 @@ void git_inflate_init_gzip_only(z_streamp strm);
 void git_inflate_end(z_streamp strm);
 int git_inflate(z_streamp strm, int flush);
 
+void git_deflate_init(z_streamp strm, int level);
+void git_deflate_init_gzip(z_streamp strm, int level);
+void git_deflate_end(z_streamp strm);
+int git_deflate_end_gently(z_streamp strm);
+int git_deflate(z_streamp strm, int flush);
+
 #if defined(DT_UNKNOWN) && !defined(NO_D_TYPE_IN_DIRENT)
 #define DTYPE(de)	((de)->d_type)
 #else