/*

    Copyright (C) 2000, 2004 Herbert Valerio Riedel <hvr@gnu.org>

    Copyright (C) 2005, 2008, 2012, 2015 Rocky Bernstein <rocky@gnu.org>

    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, either version 3 of the License, or

    (at your option) any later version.

    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, see <http://www.gnu.org/licenses/>.

*/

/** \file bytesex.h

 *  \brief  Generic Byte-swapping routines.

 *

 *   Note: this header will is slated to get removed and libcdio will

 *   use glib.h routines instead.

*/

#ifndef CDIO_BYTESEX_H_

#define CDIO_BYTESEX_H_

#include <cdio/types.h>

#include <cdio/bytesex_asm.h> /* also defines CDIO_INLINE */

#include <cdio/logging.h>

/** 16-bit big-endian to little-endian */

#define UINT16_SWAP_LE_BE_C(val) ((uint16_t) ( \

    (((uint16_t) (val) & (uint16_t) 0x00ffU) << 8) | \

    (((uint16_t) (val) & (uint16_t) 0xff00U) >> 8)))

/** 32-bit big-endian to little-endian */

#define UINT32_SWAP_LE_BE_C(val) ((uint32_t) ( \

    (((uint32_t) (val) & (uint32_t) 0x000000ffU) << 24) | \

    (((uint32_t) (val) & (uint32_t) 0x0000ff00U) <<  8) | \

    (((uint32_t) (val) & (uint32_t) 0x00ff0000U) >>  8) | \

    (((uint32_t) (val) & (uint32_t) 0xff000000U) >> 24)))

/** 64-bit big-endian to little-endian */

#define UINT64_SWAP_LE_BE_C(val) ((uint64_t) ( \

    (((uint64_t) (val) & (uint64_t) UINT64_C(0x00000000000000ff)) << 56) | \

    (((uint64_t) (val) & (uint64_t) UINT64_C(0x000000000000ff00)) << 40) | \

    (((uint64_t) (val) & (uint64_t) UINT64_C(0x0000000000ff0000)) << 24) | \

    (((uint64_t) (val) & (uint64_t) UINT64_C(0x00000000ff000000)) <<  8) | \

    (((uint64_t) (val) & (uint64_t) UINT64_C(0x000000ff00000000)) >>  8) | \

    (((uint64_t) (val) & (uint64_t) UINT64_C(0x0000ff0000000000)) >> 24) | \

    (((uint64_t) (val) & (uint64_t) UINT64_C(0x00ff000000000000)) >> 40) | \

    (((uint64_t) (val) & (uint64_t) UINT64_C(0xff00000000000000)) >> 56)))

#ifndef UINT16_SWAP_LE_BE

# define UINT16_SWAP_LE_BE UINT16_SWAP_LE_BE_C

#endif

#ifndef UINT32_SWAP_LE_BE

# define UINT32_SWAP_LE_BE UINT32_SWAP_LE_BE_C

#endif

#ifndef UINT64_SWAP_LE_BE

# define UINT64_SWAP_LE_BE UINT64_SWAP_LE_BE_C

#endif

static CDIO_INLINE

uint16_t uint16_swap_le_be (const uint16_t val)

{

  return UINT16_SWAP_LE_BE (val);

}

static CDIO_INLINE

uint32_t uint32_swap_le_be (const uint32_t val)

{

  return UINT32_SWAP_LE_BE (val);

}

static CDIO_INLINE

uint64_t uint64_swap_le_be (const uint64_t val)

{

  return UINT64_SWAP_LE_BE (val);

}

# define UINT8_TO_BE(val)      ((uint8_t) (val))

# define UINT8_TO_LE(val)      ((uint8_t) (val))

#ifdef WORDS_BIGENDIAN

# define UINT16_TO_BE(val)     ((uint16_t) (val))

# define UINT16_TO_LE(val)     ((uint16_t) UINT16_SWAP_LE_BE(val))

# define UINT32_TO_BE(val)     ((uint32_t) (val))

# define UINT32_TO_LE(val)     ((uint32_t) UINT32_SWAP_LE_BE(val))

# define UINT64_TO_BE(val)     ((uint64_t) (val))

# define UINT64_TO_LE(val)     ((uint64_t) UINT64_SWAP_LE_BE(val))

#else

# define UINT16_TO_BE(val)     ((uint16_t) UINT16_SWAP_LE_BE(val))

# define UINT16_TO_LE(val)     ((uint16_t) (val))

# define UINT32_TO_BE(val)     ((uint32_t) UINT32_SWAP_LE_BE(val))

# define UINT32_TO_LE(val)     ((uint32_t) (val))

# define UINT64_TO_BE(val)     ((uint64_t) UINT64_SWAP_LE_BE(val))

# define UINT64_TO_LE(val)     ((uint64_t) (val))

#endif

/** symmetric conversions */

#define UINT8_FROM_BE(val)     (UINT8_TO_BE (val))

#define UINT8_FROM_LE(val)     (UINT8_TO_LE (val))

#define UINT16_FROM_BE(val)    (UINT16_TO_BE (val))

#define UINT16_FROM_LE(val)    (UINT16_TO_LE (val))

#define UINT32_FROM_BE(val)    (UINT32_TO_BE (val))

#define UINT32_FROM_LE(val)    (UINT32_TO_LE (val))

#define UINT64_FROM_BE(val)    (UINT64_TO_BE (val))

#define UINT64_FROM_LE(val)    (UINT64_TO_LE (val))

/** converter function template */

#define CVT_TO_FUNC(bits) \

 static CDIO_INLINE uint ## bits ## _t \

 uint ## bits ## _to_be (uint ## bits ## _t val) \

 { return UINT ## bits ## _TO_BE (val); } \

 static CDIO_INLINE uint ## bits ## _t \

 uint ## bits ## _to_le (uint ## bits ## _t val) \

 { return UINT ## bits ## _TO_LE (val); } \

CVT_TO_FUNC(8)

CVT_TO_FUNC(16)

CVT_TO_FUNC(32)

CVT_TO_FUNC(64)

#undef CVT_TO_FUNC

#define uint8_from_be(val)     (uint8_to_be (val))

#define uint8_from_le(val)     (uint8_to_le (val))

#define uint16_from_be(val)    (uint16_to_be (val))

#define uint16_from_le(val)    (uint16_to_le (val))

#define uint32_from_be(val)    (uint32_to_be (val))

#define uint32_from_le(val)    (uint32_to_le (val))

#define uint64_from_be(val)    (uint64_to_be (val))

#define uint64_from_le(val)    (uint64_to_le (val))

/** ISO9660-related field conversion routines */

/** Convert from uint8_t to ISO 9660 7.1.1 format */

#define to_711(i)   uint8_to_le(i)

/** Convert from ISO 9660 7.1.1 format to uint8_t */

#define from_711(i) uint8_from_le(i)

/** Convert from uint16_t to ISO 9669 7.2.1 format */

#define to_721(i)   uint16_to_le(i)

/** Convert from ISO 9660 7.2.1 format to uint16_t */

#define from_721(i) uint16_from_le(i)

/** Convert from uint16_t to ISO 9669 7.2.2 format */

#define to_722(i)   uint16_to_be(i)

/** Convert from ISO 9660 7.2.2 format to uint16_t */

#define from_722(i) uint16_from_be(i)

/** Convert from uint16_t to ISO 9669 7.2.3 format */

static CDIO_INLINE uint32_t

to_723(uint16_t i)

{

  return uint32_swap_le_be(i) | i;

}

/** Convert from ISO 9660 7.2.3 format to uint16_t */

static CDIO_INLINE uint16_t

from_723 (uint32_t p)

{

  if (uint32_swap_le_be (p) != p)

    cdio_warn ("from_723: broken byte order");

  return (0xFFFF & p);

}

/** Convert from uint16_t to ISO 9669 7.3.1 format */

#define to_731(i)   uint32_to_le(i)

/** Convert from ISO 9660 7.3.1 format to uint32_t */

#define from_731(i) uint32_from_le(i)

/** Convert from uint32_t to ISO 9669 7.3.2 format */

#define to_732(i)   uint32_to_be(i)

/** Convert from ISO 9660 7.3.2 format to uint32_t */

#define from_732(i) uint32_from_be(i)

/** Convert from uint16_t to ISO 9669 7.3.3 format */

static CDIO_INLINE uint64_t

to_733(uint32_t i)

{

  return uint64_swap_le_be(i) | i;

}

/** Convert from ISO 9660 7.3.3 format to uint32_t */

static CDIO_INLINE uint32_t

from_733 (uint64_t p)

{

  if (uint64_swap_le_be (p) != p)

    cdio_warn ("from_733: broken byte order");

  return (UINT32_C(0xFFFFFFFF) & p);

}

static CDIO_INLINE uint32_t

from_733_with_err (uint64_t p, bool *err)

{

  if (uint64_swap_le_be (p) != p) {

    cdio_warn ("from_733: broken byte order");

    *err = true;

  } else {

    *err = false;

  }

  return (UINT32_C(0xFFFFFFFF) & p);

}

#endif /* CDIO_BYTESEX_H_ */

/*

 * Local variables:

 *  c-file-style: "gnu"

 *  tab-width: 8

 *  indent-tabs-mode: nil

 * End:

 */