/**

* Copyright (c) 2021 OceanBase

* OceanBase CE is licensed under Mulan PubL v2.

* You can use this software according to the terms and conditions of the Mulan PubL v2.

* You may obtain a copy of Mulan PubL v2 at:

* http://license.coscl.org.cn/MulanPubL-2.0

* THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,

* EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,

* MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.

* See the Mulan PubL v2 for more details.

*/

#include "sql/parser/parser_utility.h"

#include "lib/utility/ob_macro_utils.h"

#include <cstddef>

int parser_to_hex_cstr(

const void *in_data,

const int64_t data_length,

char *buff,

const int64_t buff_size)

{

int ret = 0;

int64_t pos = 0;

int64_t cstr_pos = 0;

if (0 != (ret = parser_to_hex_cstr_(in_data, data_length, buff, buff_size, &pos, &cstr_pos))) {

}

return ret;

}

static const char *HEXCHARS = "0123456789ABCDEF";

int parser_to_hex_cstr_(

const void *in_data,

const int64_t data_length,

char *buf,

const int64_t buf_len,

int64_t *pos,

int64_t *cstr_pos)

{

int ret = 0;

*cstr_pos = *pos;

if ((OB_UNLIKELY(data_length > 0) && OB_ISNULL(in_data))

|| OB_ISNULL(buf)

|| OB_UNLIKELY(*pos < 0)

|| OB_UNLIKELY(buf_len - *pos) < 1) {

ret = -1;

// LOG_WARN("Invalid argument", KP(in_data), KP(buf), K(data_length), K(buf_len), K(ret));

} else if ((buf_len - *pos) < (data_length * 2 + 1)) {

buf[*pos++] = '\0';

ret = -2;

// LOG_WARN("size is overflow", K(buf_len), K(data_length), K(buf_len), K(pos), K(ret));

} else {

unsigned const char *p = (unsigned const char *)in_data;

char *dst = static_cast<char *>(buf + *pos);

for (int64_t i = 0; i < data_length; ++i) {

*dst++ = HEXCHARS[*p >> 4 & 0xF];

*dst++ = HEXCHARS[*p & 0xF];

p++;

}

*dst = '\0';

*pos += (data_length * 2 + 1);

}

return ret;

}