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diff --git a/plugins/eg-sampler.lv2/atom_sink.h b/plugins/eg-sampler.lv2/atom_sink.h
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+/*
+ Copyright 2016 David Robillard <d@drobilla.net>
+
+ Permission to use, copy, modify, and/or distribute this software for any
+ purpose with or without fee is hereby granted, provided that the above
+ copyright notice and this permission notice appear in all copies.
+
+ THIS SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+
+/**
+ A forge sink that writes to an atom buffer.
+
+ It is assumed that the handle points to an LV2_Atom large enough to store
+ the forge output. The forged result is in the body of the buffer atom.
+*/
+static LV2_Atom_Forge_Ref
+atom_sink(LV2_Atom_Forge_Sink_Handle handle, const void* buf, uint32_t size)
+{
+ LV2_Atom* atom = (LV2_Atom*)handle;
+ const uint32_t offset = lv2_atom_total_size(atom);
+ memcpy((char*)atom + offset, buf, size);
+ atom->size += size;
+ return offset;
+}
+
+/**
+ Dereference counterpart to atom_sink().
+*/
+static LV2_Atom*
+atom_sink_deref(LV2_Atom_Forge_Sink_Handle handle, LV2_Atom_Forge_Ref ref)
+{
+ return (LV2_Atom*)((char*)handle + ref);
+}