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