Check the return value inside of the loop

Signed-off-by: Hiroshi Hatake <[email protected]>

Author: cosmo0920

ext/zstdruby/streaming_decompress.c

@@ -102,14 +102,15 @@ rb_streaming_decompress_decompress(VALUE obj, VALUE src)
   TypedData_Get_Struct(obj, struct streaming_decompress_t, &streaming_decompress_type, sd);
   const char* output_data = RSTRING_PTR(sd->buf);
   VALUE result = rb_str_new(0, 0);
-  while (input.pos < input.size) {
+  size_t ret;
+  do {
     ZSTD_outBuffer output = { (void*)output_data, sd->buf_size, 0 };
-    size_t const ret = zstd_stream_decompress(sd->dctx, &output, &input, false);
+    ret = zstd_stream_decompress(sd->dctx, &output, &input, false);
     if (ZSTD_isError(ret)) {
       rb_raise(rb_eRuntimeError, "decompress error error code: %s", ZSTD_getErrorName(ret));
     }
     rb_str_cat(result, output.dst, output.pos);
-  }
+  } while (input.pos < input.size && ret > 0);
   return result;
 }