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+/*
+ * Copyright (c) 2016-2020, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under both the BSD-style license (found in the
+ * LICENSE file in the root directory of this source tree) and the GPLv2 (found
+ * in the COPYING file in the root directory of this source tree).
+ * You may select, at your option, one of the above-listed licenses.
+ */
+
+#ifndef METHOD_H
+#define METHOD_H
+
+#include <stddef.h>
+
+#include "data.h"
+#include "config.h"
+#include "result.h"
+
+/**
+ * The base class for state that methods keep.
+ * All derived method state classes must have a member of this type.
+ */
+typedef struct {
+ data_t const* data;
+} method_state_t;
+
+/**
+ * A method that compresses the data using config.
+ */
+typedef struct {
+ char const* name; /**< The identifier for this method in the results. */
+ /**
+ * Creates a state that must contain a member variable of method_state_t,
+ * and returns a pointer to that member variable.
+ *
+ * This method can be used to do expensive work that only depends on the
+ * data, like loading the data file into a buffer.
+ */
+ method_state_t* (*create)(data_t const* data);
+ /**
+ * Compresses the data in the state using the given config.
+ *
+ * @param state A pointer to the state returned by create().
+ *
+ * @returns The total compressed size on success, or an error code.
+ */
+ result_t (*compress)(method_state_t* state, config_t const* config);
+ /**
+ * Frees the state.
+ */
+ void (*destroy)(method_state_t* state);
+} method_t;
+
+/**
+ * Set the zstd cli path. Must be called before any methods are used.
+ */
+void method_set_zstdcli(char const* zstdcli);
+
+/**
+ * A NULL-terminated list of methods.
+ */
+extern method_t const* const* methods;
+
+#endif