metadata: Add metadata factory and implementation for integer types

Co-authored-by: Thomas Egerer <[email protected]>

src/libstrongswan/metadata/metadata_int.c

@@ -0,0 +1,158 @@
+/*
+ * Copyright (C) 2021 Tobias Brunner, codelabs GmbH
+ * Copyright (C) 2021 Thomas Egerer, secunet AG
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "metadata_int.h"
+
+#include <library.h>
+
+typedef struct private_metadata_t private_metadata_t;
+
+/**
+ * Private data
+ */
+struct private_metadata_t {
+
+	/**
+	 * Public interface
+	 */
+	metadata_t public;
+
+	/**
+	 * String representation of type.
+	 */
+	const char *type;
+
+	/**
+	 * Stored value.
+	 */
+	uint64_t value;
+};
+
+/* forward declaration */
+static metadata_t *create_generic(const char *type, uint64_t value);
+
+METHOD(metadata_t, get_type, const char*,
+	private_metadata_t *this)
+{
+	return this->type;
+}
+
+METHOD(metadata_t, clone_, metadata_t*,
+	private_metadata_t *this)
+{
+	return create_generic(this->type, this->value);
+}
+
+METHOD(metadata_t, equals, bool,
+	private_metadata_t *this, ...)
+{
+	/* bool, uint8, uint16 etc. are promoted to int when passed via ... */
+	if (streq(METADATA_TYPE_INT, this->type))
+	{
+		int value;
+
+		VA_ARGS_GET(this, value);
+		return value == (int)this->value;
+	}
+	else if (streq(METADATA_TYPE_UINT64, this->type))
+	{
+		uint64_t value;
+
+		VA_ARGS_GET(this, value);
+		return value == this->value;
+	}
+	return FALSE;
+}
+
+METHOD(metadata_t, get, void,
+	private_metadata_t *this, ...)
+{
+	/* pointers here have to match exactly, so passing e.g. a bool* or uint16_t
+	 * are illegal */
+	if (streq(METADATA_TYPE_INT, this->type))
+	{
+		int *value;
+
+		VA_ARGS_GET(this, value);
+		*value = this->value;
+	}
+	else if (streq(METADATA_TYPE_UINT64, this->type))
+	{
+		uint64_t *value;
+
+		VA_ARGS_GET(this, value);
+		*value = this->value;
+	}
+}
+
+METHOD(metadata_t, destroy, void,
+	private_metadata_t *this)
+{
+	free(this);
+}
+
+/**
+ * Generic constructor
+ */
+static metadata_t *create_generic(const char *type, uint64_t value)
+{
+	private_metadata_t *this;
+
+	INIT(this,
+		.public = {
+			.get_type = _get_type,
+			.clone = _clone_,
+			.equals = _equals,
+			.get = _get,
+			.destroy = _destroy,
+		},
+		.type = type,
+		.value = value,
+	);
+	return &this->public;
+}
+
+/*
+ * Described in header
+ */
+metadata_t *metadata_create_int(const char *type, va_list args)
+{
+	metadata_t *this = NULL;
+
+	/* bool, uint8, uint16 etc. are promoted to int when passed via ... */
+	if (streq(METADATA_TYPE_INT, type))
+	{
+		int int_val;
+
+		VA_ARGS_VGET(args, int_val);
+		this = create_generic(METADATA_TYPE_INT, int_val);
+	}
+	else if (streq(METADATA_TYPE_UINT64, type))
+	{
+		uint64_t uint64_val;
+
+		VA_ARGS_VGET(args, uint64_val);
+		this = create_generic(METADATA_TYPE_UINT64, uint64_val);
+	}
+	return this;
+}