/*****************************************************************************

Copyright (c) 1994, 2014, Oracle and/or its affiliates. All Rights Reserved.
Copyright (c) 2017, 2019, MariaDB Corporation.

This program is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free Software
Foundation; version 2 of the License.

This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with
this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA

*****************************************************************************/

/*******************************************************************//**
@file include/ut0mem.ic
Memory primitives

Created 5/30/1994 Heikki Tuuri
************************************************************************/

#include "ut0byte.h"
#include "mach0data.h"

/**********************************************************************//**
Converts a raw binary data to a NUL-terminated hex string. The output is
truncated if there is not enough space in "hex", make sure "hex_size" is at
least (2 * raw_size + 1) if you do not want this to happen. Returns the
actual number of characters written to "hex" (including the NUL).
@return number of chars written */
UNIV_INLINE
ulint
ut_raw_to_hex(
/*==========*/
	const void*	raw,		/*!< in: raw data */
	ulint		raw_size,	/*!< in: "raw" length in bytes */
	char*		hex,		/*!< out: hex string */
	ulint		hex_size)	/*!< in: "hex" size in bytes */
{

#ifdef WORDS_BIGENDIAN

#define MK_UINT16(a, b) (((uint16) (a)) << 8 | (uint16) (b))

#define UINT16_GET_A(u)	((char) ((u) >> 8))
#define UINT16_GET_B(u)	((char) ((u) & 0xFF))

#else /* WORDS_BIGENDIAN */

#define MK_UINT16(a, b) (((uint16) (b)) << 8 | (uint16) (a))

#define UINT16_GET_A(u)	((char) ((u) & 0xFF))
#define UINT16_GET_B(u)	((char) ((u) >> 8))

#endif /* WORDS_BIGENDIAN */

#define MK_ALL_UINT16_WITH_A(a)	\
	MK_UINT16(a, '0'),	\
	MK_UINT16(a, '1'),	\
	MK_UINT16(a, '2'),	\
	MK_UINT16(a, '3'),	\
	MK_UINT16(a, '4'),	\
	MK_UINT16(a, '5'),	\
	MK_UINT16(a, '6'),	\
	MK_UINT16(a, '7'),	\
	MK_UINT16(a, '8'),	\
	MK_UINT16(a, '9'),	\
	MK_UINT16(a, 'A'),	\
	MK_UINT16(a, 'B'),	\
	MK_UINT16(a, 'C'),	\
	MK_UINT16(a, 'D'),	\
	MK_UINT16(a, 'E'),	\
	MK_UINT16(a, 'F')

	static const uint16	hex_map[256] = {
		MK_ALL_UINT16_WITH_A('0'),
		MK_ALL_UINT16_WITH_A('1'),
		MK_ALL_UINT16_WITH_A('2'),
		MK_ALL_UINT16_WITH_A('3'),
		MK_ALL_UINT16_WITH_A('4'),
		MK_ALL_UINT16_WITH_A('5'),
		MK_ALL_UINT16_WITH_A('6'),
		MK_ALL_UINT16_WITH_A('7'),
		MK_ALL_UINT16_WITH_A('8'),
		MK_ALL_UINT16_WITH_A('9'),
		MK_ALL_UINT16_WITH_A('A'),
		MK_ALL_UINT16_WITH_A('B'),
		MK_ALL_UINT16_WITH_A('C'),
		MK_ALL_UINT16_WITH_A('D'),
		MK_ALL_UINT16_WITH_A('E'),
		MK_ALL_UINT16_WITH_A('F')
	};
	const unsigned char*	rawc;
	ulint			read_bytes;
	ulint			write_bytes;
	ulint			i;

	rawc = (const unsigned char*) raw;

	if (hex_size == 0) {

		return(0);
	}

	if (hex_size <= 2 * raw_size) {

		read_bytes = hex_size / 2;
		write_bytes = hex_size;
	} else {

		read_bytes = raw_size;
		write_bytes = 2 * raw_size + 1;
	}

#define LOOP_READ_BYTES(ASSIGN)			\
	for (i = 0; i < read_bytes; i++) {	\
		ASSIGN;				\
		hex += 2;			\
		rawc++;				\
	}

	if (ut_align_offset(hex, 2) == 0) {

		LOOP_READ_BYTES(
			*(uint16*) hex = hex_map[*rawc]
		);
	} else {

		LOOP_READ_BYTES(
			*hex       = UINT16_GET_A(hex_map[*rawc]);
			*(hex + 1) = UINT16_GET_B(hex_map[*rawc])
		);
	}

	if (hex_size <= 2 * raw_size && hex_size % 2 == 0) {

		hex--;
	}

	*hex = '\0';

	return(write_bytes);
}

/*******************************************************************//**
Adds single quotes to the start and end of string and escapes any quotes
by doubling them. Returns the number of bytes that were written to "buf"
(including the terminating NUL). If buf_size is too small then the
trailing bytes from "str" are discarded.
@return number of bytes that were written */
UNIV_INLINE
ulint
ut_str_sql_format(
/*==============*/
	const char*	str,		/*!< in: string */
	ulint		str_len,	/*!< in: string length in bytes */
	char*		buf,		/*!< out: output buffer */
	ulint		buf_size)	/*!< in: output buffer size
					in bytes */
{
	ulint	str_i;
	ulint	buf_i;

	buf_i = 0;

	switch (buf_size) {
	case 3:

		if (str_len == 0) {

			buf[buf_i] = '\'';
			buf_i++;
			buf[buf_i] = '\'';
			buf_i++;
		}
		/* FALLTHROUGH */
	case 2:
	case 1:

		buf[buf_i] = '\0';
		buf_i++;
		/* FALLTHROUGH */
	case 0:

		return(buf_i);
	}

	/* buf_size >= 4 */

	buf[0] = '\'';
	buf_i = 1;

	for (str_i = 0; str_i < str_len; str_i++) {

		char	ch;

		if (buf_size - buf_i == 2) {

			break;
		}

		ch = str[str_i];

		switch (ch) {
		case '\0':

			if (buf_size - buf_i < 4) {

				goto func_exit;
			}
			buf[buf_i] = '\\';
			buf_i++;
			buf[buf_i] = '0';
			buf_i++;
			break;
		case '\'':
		case '\\':

			if (buf_size - buf_i < 4) {

				goto func_exit;
			}
			buf[buf_i] = ch;
			buf_i++;
			/* FALLTHROUGH */
		default:

			buf[buf_i] = ch;
			buf_i++;
		}
	}

func_exit:

	buf[buf_i] = '\'';
	buf_i++;
	buf[buf_i] = '\0';
	buf_i++;

	return(buf_i);
}
