Create zlib_deflate wrapper functions

libretro-common/file/file_extract.c

@@ -306,6 +306,14 @@ bool zlib_inflate_init2(void *data)
    return true;
 }
 
+void zlib_deflate_init(void *data, int level)
+{
+   z_stream *stream = (z_stream*)data;
+
+   if (stream)
+      deflateInit(stream, level);
+}
+
 bool zlib_inflate_init(void *data)
 {
    z_stream *stream = (z_stream*)data;
@@ -324,6 +332,13 @@ void zlib_stream_free(void *data)
       inflateEnd(ret);
 }
 
+void zlib_stream_deflate_free(void *data)
+{
+   z_stream *ret = (z_stream*)data;
+   if (ret)
+      deflateEnd(ret);
+}
+
 bool zlib_inflate_data_to_file_init(
       zlib_file_handle_t *handle,
       const uint8_t *cdata,  uint32_t csize, uint32_t size)
@@ -367,6 +382,22 @@ error:
    return false;
 }
 
+int zlib_deflate_data_to_file(void *data)
+{
+   int zstatus;
+   z_stream *stream = (z_stream*)data;
+
+   if (!stream)
+      return -1;
+
+   zstatus = deflate(stream, Z_FINISH);
+
+   if (zstatus == Z_STREAM_END)
+      return 1;
+
+   return 0;
+}
+
 int zlib_inflate_data_to_file_iterate(void *data)
 {
    int zstatus;

libretro-common/formats/png/rpng_encode.c

@@ -315,13 +315,15 @@ static bool rpng_save_image(const char *path,
          encode_buf,
          deflate_buf + 8);
 
-   deflateInit(&stream, 9);
-   if (deflate(&stream, Z_FINISH) != Z_STREAM_END)
+   zlib_deflate_init(&stream, 9);
+
+   if (zlib_deflate_data_to_file(&stream) != 1)
    {
-      deflateEnd(&stream);
+      zlib_stream_deflate_free(&stream);
       GOTO_END_ERROR();
    }
-   deflateEnd(&stream);
+
+   zlib_stream_deflate_free(&stream);
 
    memcpy(deflate_buf + 4, "IDAT", 4);
    dword_write_be(deflate_buf + 0, zlib_stream_get_total_out(&stream));

libretro-common/include/file/file_extract.h

@@ -117,6 +117,12 @@ void *zlib_stream_new(void);
 
 void zlib_stream_free(void *data);
 
+void zlib_deflate_init(void *data, int level);
+
+int zlib_deflate_data_to_file(void *data);
+
+void zlib_stream_deflate_free(void *data);
+
 bool zlib_inflate_init(void *data);
 
 bool zlib_inflate_init2(void *data);