/*
 *
 * Copyright 2018 gRPC authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */

#ifndef GRPC_TEST_CORE_TSI_ALTS_CRYPT_GSEC_TEST_UTIL_H_
#define GRPC_TEST_CORE_TSI_ALTS_CRYPT_GSEC_TEST_UTIL_H_

#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include <grpc/grpc.h>

/**
 * This method returns random bytes of certain length.
 *
 * - bytes: buffer to hold random bytes.
 * - length: length of buffer to be populated.
 */
void gsec_test_random_bytes(uint8_t* bytes, size_t length);

/**
 * This method returns an array of random bytes.
 *
 * - bytes: array to hold random bytes.
 * - length: length of array to be populated.
 */
void gsec_test_random_array(uint8_t** bytes, size_t length);

/**
 * This method returns a uint32 that's not quite uniformly random, but good
 * enough for tests.
 *
 * - max_length: a max value the returned random number can choose.
 */
uint32_t gsec_test_bias_random_uint32(uint32_t max_length);

/**
 * This method copies data from a source to a destination buffer.
 *
 * - src: a source buffer.
 * - des: a destination buffer.
 * - length: the length of source buffer to be copied from its beginning.
 */
void gsec_test_copy(const uint8_t* src, uint8_t** des, size_t length);

/**
 * This method copies data from a source to a destination buffer, and flips one
 * byte in the destination buffer randomly.
 *
 * - src: a source buffer.
 * - des: a destination buffer.
 * - length: the length of source buffer to be copied from its beginning.
 */
void gsec_test_copy_and_alter_random_byte(const uint8_t* src, uint8_t** des,
                                          size_t source_len);

/**
 * This method compares two grpc_status_code values, and verifies if one string
 * is a substring of the other.
 *
 * - status1: the first grpc_status_code to be compared.
 * - status2: the second grpc_status_code to be compared.
 * - msg1: a string to be scanned.
 * - msg2: a small string to be searched within msg1.
 *
 * If both checks succeed, the method returns 1 and otherwise, it returns 0.
 */
int gsec_test_expect_compare_code_and_substr(grpc_status_code status1,
                                             grpc_status_code status2,
                                             const char* msg1,
                                             const char* msg2);

#endif  // GRPC_TEST_CORE_TSI_ALTS_CRYPT_GSEC_TEST_UTIL_H_ */