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-rw-r--r--ingen/AtomForgeSink.hpp102
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diff --git a/ingen/AtomForgeSink.hpp b/ingen/AtomForgeSink.hpp
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-/*
- This file is part of Ingen.
- Copyright 2007-2017 David Robillard <http://drobilla.net/>
-
- Ingen is free software: you can redistribute it and/or modify it under the
- terms of the GNU Affero General Public License as published by the Free
- Software Foundation, either version 3 of the License, or any later version.
-
- Ingen is distributed in the hope that it will be useful, but WITHOUT ANY
- WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
- A PARTICULAR PURPOSE. See the GNU Affero General Public License for details.
-
- You should have received a copy of the GNU Affero General Public License
- along with Ingen. If not, see <http://www.gnu.org/licenses/>.
-*/
-
-#ifndef INGEN_ATOMFORGESINK_HPP
-#define INGEN_ATOMFORGESINK_HPP
-
-#include <cassert>
-#include <cstdint>
-#include <cstdlib>
-#include <cstring>
-
-#include "lv2/lv2plug.in/ns/ext/atom/atom.h"
-#include "lv2/lv2plug.in/ns/ext/atom/forge.h"
-#include "lv2/lv2plug.in/ns/ext/atom/util.h"
-
-namespace Ingen {
-
-/** A resizing sink for LV2_Atom_Forge. */
-class AtomForgeSink
-{
-public:
- explicit AtomForgeSink(LV2_Atom_Forge* forge = nullptr)
- : _capacity(8 * sizeof(LV2_Atom))
- , _size(0)
- , _buf((LV2_Atom*)calloc(8, sizeof(LV2_Atom)))
- {
- if (forge) {
- set_forge_sink(forge);
- }
- }
-
- ~AtomForgeSink() { free(_buf); }
-
- void set_forge_sink(LV2_Atom_Forge* forge) {
- lv2_atom_forge_set_sink(forge, c_append, c_deref, this);
- }
-
- /** Append some data and return a reference to its start. */
- intptr_t append(const void* buf, uint32_t len) {
- // Record offset of the start of this write (+1 to avoid NULL)
- const intptr_t ref = _size + 1;
-
- // Update size and reallocate if necessary
- if (lv2_atom_pad_size(_size + len) > _capacity) {
- _capacity = lv2_atom_pad_size(_size + len);
- _buf = (LV2_Atom*)realloc(_buf, _capacity);
- }
-
- // Append new data
- memcpy((uint8_t*)_buf + _size, buf, len);
- _size += len;
- return ref;
- }
-
- /** Dereference a reference previously returned by append. */
- LV2_Atom* deref(intptr_t ref) {
- /* Make some assumptions and do unnecessary math to appease
- -Wcast-align. This is questionable at best, though the forge should
- only dereference references to aligned atoms. */
- assert((ref - 1) % sizeof(LV2_Atom) == 0);
- return (LV2_Atom*)(_buf + (ref - 1) / sizeof(LV2_Atom));
-
- // Alternatively:
- // return (LV2_Atom*)((uint8_t*)_buf + ref - 1);
- }
-
- const LV2_Atom* atom() const { return _buf; }
-
- void clear() { _buf->type = 0; _buf->size = 0; _size = 0; }
-
- static LV2_Atom_Forge_Ref
- c_append(void* handle, const void* buf, uint32_t len) {
- return ((AtomForgeSink*)handle)->append(buf, len);
- }
-
- static LV2_Atom*
- c_deref(void* handle, LV2_Atom_Forge_Ref ref) {
- return ((AtomForgeSink*)handle)->deref(ref);
- }
-
-private:
- size_t _capacity;
- size_t _size;
- LV2_Atom* _buf;
-};
-
-} // namespace Ingen
-
-#endif // INGEN_ATOMFORGESINK_HPP