Adding missing lv2_urid_helper.h file

src/modules/lv2/lv2_urid_helper.h

@@ -0,0 +1,67 @@
+/*
+ * LV2 URID Helpers
+ *
+ * Adapted from lv2bench.c from lilv project https://drobilla.net/software/lilv.html - http://gitlab.com/lv2/lilv.git
+ *
+ * Copyright (C) David Robillard 2012-2019 (d@drobilla.net)
+ * Copyright (C) mr.fantastic (mrfantastic@firemail.cc) and MLT project 2024
+ *
+ * ISC License
+ * SPDX-License-Identifier: ISC
+ *
+ * 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.
+ *
+ * THE 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.
+ */
+
+#ifndef __LV2_URID_HELPER_H__
+#define __LV2_URID_HELPER_H__
+
+typedef struct {
+  char** uris;
+  size_t n_uris;
+} URITable;
+
+static void
+uri_table_init(URITable* table)
+{
+  table->uris   = NULL;
+  table->n_uris = 0;
+}
+
+static LV2_URID
+uri_table_map(LV2_URID_Map_Handle handle, const char* uri)
+{
+  URITable* table = (URITable*)handle;
+  for (size_t i = 0; i < table->n_uris; ++i) {
+    if (!strcmp(table->uris[i], uri)) {
+      return i + 1;
+    }
+  }
+
+  const size_t len = strlen(uri);
+  table->uris = (char**)realloc(table->uris, ++table->n_uris * sizeof(char*));
+  table->uris[table->n_uris - 1] = (char*)malloc(len + 1);
+  memcpy(table->uris[table->n_uris - 1], uri, len + 1);
+  return table->n_uris;
+}
+
+static const char*
+uri_table_unmap(LV2_URID_Map_Handle handle, LV2_URID urid)
+{
+  URITable* table = (URITable*)handle;
+  if (urid > 0 && urid <= table->n_uris) {
+    return table->uris[urid - 1];
+  }
+  return NULL;
+}
+
+#endif /* __LV2_URID_HELPER_H__ */