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/*
* Copyright (c) 2016-present, Yann Collet, 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 RESULT_H
#define RESULT_H
#include <stddef.h>
/**
* The error type enum.
*/
typedef enum {
result_error_ok, /**< No error. */
result_error_skip, /**< This method was skipped. */
result_error_system_error, /**< Some internal error happened. */
result_error_compression_error, /**< Compression failed. */
result_error_decompression_error, /**< Decompression failed. */
result_error_round_trip_error, /**< Data failed to round trip. */
} result_error_t;
/**
* The success type.
*/
typedef struct {
size_t total_size; /**< The total compressed size. */
} result_data_t;
/**
* The result type.
* Do not access the member variables directory, use the helper functions.
*/
typedef struct {
result_error_t internal_error;
result_data_t internal_data;
} result_t;
/**
* Create a result of the error type.
*/
static result_t result_error(result_error_t error);
/**
* Create a result of the success type.
*/
static result_t result_data(result_data_t data);
/**
* Check if the result is an error or skip.
*/
static int result_is_error(result_t result);
/**
* Check if the result error is skip.
*/
static int result_is_skip(result_t result);
/**
* Get the result error or okay.
*/
static result_error_t result_get_error(result_t result);
/**
* Get the result data. The result MUST be checked with result_is_error() first.
*/
static result_data_t result_get_data(result_t result);
static result_t result_error(result_error_t error) {
result_t result = {
.internal_error = error,
};
return result;
}
static result_t result_data(result_data_t data) {
result_t result = {
.internal_error = result_error_ok,
.internal_data = data,
};
return result;
}
static int result_is_error(result_t result) {
return result_get_error(result) != result_error_ok;
}
static int result_is_skip(result_t result) {
return result_get_error(result) == result_error_skip;
}
static result_error_t result_get_error(result_t result) {
return result.internal_error;
}
char const* result_get_error_string(result_t result);
static result_data_t result_get_data(result_t result) {
return result.internal_data;
}
#endif
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