avcodec/zlib_wrapper: Add wrapper for deflateInit()

The rationale is the same as for the wrappers for inflateInit(),
although the case for it is admittedly not so strong because
there are less users of deflateInit().
Also remove an unnecessary inclusion of config.h in
libavformat/protocols.c in order to trigger a request for reconfigure
(which is needed for CONFIG_DEFLATE_WRAPPER to take effect).

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

configure

@@ -2433,6 +2433,7 @@ CONFIG_EXTRA="
     cbs_jpeg
     cbs_mpeg2
     cbs_vp9
+    deflate_wrapper
     dirac_parse
     dnn
     dovi_rpu
@@ -2711,6 +2712,7 @@ cbs_jpeg_select="cbs"
 cbs_mpeg2_select="cbs"
 cbs_vp9_select="cbs"
 dct_select="rdft"
+deflate_wrapper_deps="zlib"
 dirac_parse_select="golomb"
 dovi_rpu_select="golomb"
 dnn_suggest="libtensorflow libopenvino"

libavcodec/Makefile

@@ -78,6 +78,7 @@ OBJS-$(CONFIG_CBS_MPEG2)               += cbs_mpeg2.o
 OBJS-$(CONFIG_CBS_VP9)                 += cbs_vp9.o
 OBJS-$(CONFIG_CRYSTALHD)               += crystalhd.o
 OBJS-$(CONFIG_DCT)                     += dct.o dct32_fixed.o dct32_float.o
+OBJS-$(CONFIG_DEFLATE_WRAPPER)         += zlib_wrapper.o
 OBJS-$(CONFIG_DOVI_RPU)                += dovi_rpu.o
 OBJS-$(CONFIG_ERROR_RESILIENCE)        += error_resilience.o
 OBJS-$(CONFIG_EXIF)                    += exif.o tiff_common.o

libavcodec/zlib_wrapper.c

@@ -21,6 +21,7 @@
 
 #include <zlib.h>
 
+#include "config.h"
 #include "libavutil/error.h"
 #include "libavutil/log.h"
 #include "libavutil/mem.h"
@@ -36,6 +37,7 @@ static void free_wrapper(void *opaque, void *ptr)
     av_free(ptr);
 }
 
+#if CONFIG_INFLATE_WRAPPER
 int ff_inflate_init(FFZStream *z, void *logctx)
 {
     z_stream *const zstream = &z->zstream;
@@ -66,3 +68,35 @@ void ff_inflate_end(FFZStream *z)
         inflateEnd(&z->zstream);
     }
 }
+#endif
+
+#if CONFIG_DEFLATE_WRAPPER
+int ff_deflate_init(FFZStream *z, int level, void *logctx)
+{
+    z_stream *const zstream = &z->zstream;
+    int zret;
+
+    z->inited = 0;
+    zstream->zalloc = alloc_wrapper;
+    zstream->zfree  = free_wrapper;
+    zstream->opaque = Z_NULL;
+
+    zret = deflateInit(zstream, level);
+    if (zret == Z_OK) {
+        z->inited = 1;
+    } else {
+        av_log(logctx, AV_LOG_ERROR, "deflateInit error %d, message: %s\n",
+               zret, zstream->msg ? zstream->msg : "");
+        return AVERROR_EXTERNAL;
+    }
+    return 0;
+}
+
+void ff_deflate_end(FFZStream *z)
+{
+    if (z->inited) {
+        z->inited = 0;
+        deflateEnd(&z->zstream);
+    }
+}
+#endif

libavcodec/zlib_wrapper.h

@@ -48,4 +48,14 @@ int ff_inflate_init(FFZStream *zstream, void *logctx);
  */
 void ff_inflate_end(FFZStream *zstream);
 
+/**
+ * Wrapper around deflateInit(). It works analogously to ff_inflate_init().
+ */
+int ff_deflate_init(FFZStream *zstream, int level, void *logctx);
+
+/**
+ * Wrapper around deflateEnd(). It works analogously to ff_inflate_end().
+ */
+void ff_deflate_end(FFZStream *zstream);
+
 #endif /* AVCODEC_ZLIB_WRAPPER_H */

libavformat/protocols.c

@@ -16,8 +16,6 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
-#include "config.h"
-
 #include "libavutil/avstring.h"
 #include "libavutil/mem.h"