Create more wrappers around zlib in file_extract.c

libretro-common/file/file_extract.c

@@ -295,7 +295,7 @@ void *zlib_stream_new(void)
    return (z_stream*)calloc(1, sizeof(z_stream));
 }
 
-bool zlib_inflate_init(void *data)
+bool zlib_inflate_init2(void *data)
 {
    z_stream *stream = (z_stream*)data;
 
@@ -306,6 +306,17 @@ bool zlib_inflate_init(void *data)
    return true;
 }
 
+bool zlib_inflate_init(void *data)
+{
+   z_stream *stream = (z_stream*)data;
+
+   if (!stream)
+      return false;
+   if (inflateInit(stream) != Z_OK)
+      return false;
+   return true;
+}
+
 void zlib_stream_free(void *data)
 {
    z_stream *ret = (z_stream*)data;
@@ -325,7 +336,7 @@ bool zlib_inflate_data_to_file_init(
    if (!(handle->stream = (z_stream*)zlib_stream_new()))
       goto error;
    
-   if (!(zlib_inflate_init(handle->stream)))
+   if (!(zlib_inflate_init2(handle->stream)))
       goto error;
 
    handle->data = (uint8_t*)malloc(size);

libretro-common/formats/png/rpng_decode.c

@@ -648,7 +648,7 @@ bool rpng_load_image_argb_process_init(struct rpng_t *rpng,
    if (rpng->ihdr.interlace == 1) /* To be sure. */
       rpng->process.inflate_buf_size *= 2;
 
-   if (inflateInit(&rpng->process.stream) != Z_OK)
+   if (!zlib_inflate_init(&rpng->process.stream))
       return false;
 
    rpng->process.inflate_buf = (uint8_t*)malloc(rpng->process.inflate_buf_size);

libretro-common/include/file/file_extract.h

@@ -119,5 +119,7 @@ void zlib_stream_free(void *data);
 
 bool zlib_inflate_init(void *data);
 
+bool zlib_inflate_init2(void *data);
+
 #endif