include/sg_unaligned.h - platform/external/sg3_utils - Git at Google

 #ifndef SG_UNALIGNED_H
 #define SG_UNALIGNED_H

 /*
  * Copyright (c) 2014-2018 Douglas Gilbert.
  * All rights reserved.
  * Use of this source code is governed by a BSD-style
  * license that can be found in the BSD_LICENSE file.
  *
  * SPDX-License-Identifier: BSD-2-Clause
  */

 #include <stdbool.h>
 #include <stdint.h>     /* for uint8_t and friends */
 #include <string.h>     /* for memcpy */

 #ifdef __cplusplus
 extern "C" {
 #endif

 /* These inline functions convert integers (always unsigned) to byte streams
  * and vice versa. They have two goals:
  *   - change the byte ordering of integers between host order and big
  *     endian ("_be") or little endian ("_le")
  *   - copy the big or little endian byte stream so it complies with any
  *     alignment that host integers require
  *
  * Host integer to given endian byte stream is a "_put_" function taking
  * two arguments (integer and pointer to byte stream) returning void.
  * Given endian byte stream to host integer is a "_get_" function that takes
  * one argument and returns an integer of appropriate size (uint32_t for 24
  * bit operations, uint64_t for 48 bit operations).
  *
  * Big endian byte format "on the wire" is the default used by SCSI
  * standards (www.t10.org). Big endian is also the network byte order.
  * Little endian is used by ATA, PCI and NVMe.
  */

 /* The generic form of these routines was borrowed from the Linux kernel,
  * via mhvtl. There is a specialised version of the main functions for
  * little endian or big endian provided that not-quite-standard defines for
  * endianness are available from the compiler and the <byteswap.h> header
  * (a GNU extension) has been detected by ./configure . To force the
  * generic version, use './configure --disable-fast-lebe ' . */

 /* Note: Assumes that the source and destination locations do not overlap.
  * An example of overlapping source and destination:
  *     sg_put_unaligned_le64(j, ((uint8_t *)&j) + 1);
  * Best not to do things like that.
  */


 #ifdef HAVE_CONFIG_H
 #include "config.h"     /* need this to see if HAVE_BYTESWAP_H */
 #endif

 #undef GOT_UNALIGNED_SPECIALS   /* just in case */

 #if defined(__BYTE_ORDER__) && defined(HAVE_BYTESWAP_H) && \
     ! defined(IGNORE_FAST_LEBE)

 #if defined(__LITTLE_ENDIAN__) || (__BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__)

 #define GOT_UNALIGNED_SPECIALS 1

 #include <byteswap.h>           /* for bswap_16(), bswap_32() and bswap_64() */

 // #warning ">>>>>> Doing Little endian special unaligneds"

 static inline uint16_t sg_get_unaligned_be16(const void *p)
 {
         uint16_t u;

         memcpy(&u, p, 2);
         return bswap_16(u);
 }

 static inline uint32_t sg_get_unaligned_be32(const void *p)
 {
         uint32_t u;

         memcpy(&u, p, 4);
         return bswap_32(u);
 }

 static inline uint64_t sg_get_unaligned_be64(const void *p)
 {
         uint64_t u;

         memcpy(&u, p, 8);
         return bswap_64(u);
 }

 static inline void sg_put_unaligned_be16(uint16_t val, void *p)
 {
         uint16_t u = bswap_16(val);

         memcpy(p, &u, 2);
 }

 static inline void sg_put_unaligned_be32(uint32_t val, void *p)
 {
         uint32_t u = bswap_32(val);

         memcpy(p, &u, 4);
 }

 static inline void sg_put_unaligned_be64(uint64_t val, void *p)
 {
         uint64_t u = bswap_64(val);

         memcpy(p, &u, 8);
 }

 static inline uint16_t sg_get_unaligned_le16(const void *p)
 {
         uint16_t u;

         memcpy(&u, p, 2);
         return u;
 }

 static inline uint32_t sg_get_unaligned_le32(const void *p)
 {
         uint32_t u;

         memcpy(&u, p, 4);
         return u;
 }

 static inline uint64_t sg_get_unaligned_le64(const void *p)
 {
         uint64_t u;

         memcpy(&u, p, 8);
         return u;
 }

 static inline void sg_put_unaligned_le16(uint16_t val, void *p)
 {
         memcpy(p, &val, 2);
 }

 static inline void sg_put_unaligned_le32(uint32_t val, void *p)
 {
         memcpy(p, &val, 4);
 }

 static inline void sg_put_unaligned_le64(uint64_t val, void *p)
 {
         memcpy(p, &val, 8);
 }

 #elif defined(__BIG_ENDIAN__) || (__BYTE_ORDER__ == __ORDER_BIG_ENDIAN__)

 #define GOT_UNALIGNED_SPECIALS 1

 #include <byteswap.h>

 // #warning ">>>>>> Doing BIG endian special unaligneds"

 static inline uint16_t sg_get_unaligned_le16(const void *p)
 {
         uint16_t u;

         memcpy(&u, p, 2);
         return bswap_16(u);
 }

 static inline uint32_t sg_get_unaligned_le32(const void *p)
 {
         uint32_t u;

         memcpy(&u, p, 4);
         return bswap_32(u);
 }

 static inline uint64_t sg_get_unaligned_le64(const void *p)
 {
         uint64_t u;

         memcpy(&u, p, 8);
         return bswap_64(u);
 }

 static inline void sg_put_unaligned_le16(uint16_t val, void *p)
 {
         uint16_t u = bswap_16(val);

         memcpy(p, &u, 2);
 }

 static inline void sg_put_unaligned_le32(uint32_t val, void *p)
 {
         uint32_t u = bswap_32(val);

         memcpy(p, &u, 4);
 }

 static inline void sg_put_unaligned_le64(uint64_t val, void *p)
 {
         uint64_t u = bswap_64(val);

         memcpy(p, &u, 8);
 }

 static inline uint16_t sg_get_unaligned_be16(const void *p)
 {
         uint16_t u;

         memcpy(&u, p, 2);
         return u;
 }

 static inline uint32_t sg_get_unaligned_be32(const void *p)
 {
         uint32_t u;

         memcpy(&u, p, 4);
         return u;
 }

 static inline uint64_t sg_get_unaligned_be64(const void *p)
 {
         uint64_t u;

         memcpy(&u, p, 8);
         return u;
 }

 static inline void sg_put_unaligned_be16(uint16_t val, void *p)
 {
         memcpy(p, &val, 2);
 }

 static inline void sg_put_unaligned_be32(uint32_t val, void *p)
 {
         memcpy(p, &val, 4);
 }

 static inline void sg_put_unaligned_be64(uint64_t val, void *p)
 {
         memcpy(p, &val, 8);
 }

 #endif          /* __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__  */
 #endif          /* #if defined __BYTE_ORDER__ && defined <byteswap.h> &&
                  *     ! defined IGNORE_FAST_LEBE */


 #ifndef GOT_UNALIGNED_SPECIALS

 /* Now we have no tricks left, so use the only way this can be done
  * correctly in C safely: lots of shifts. */

 // #warning ">>>>>> Doing GENERIC unaligneds"

 static inline uint16_t sg_get_unaligned_be16(const void *p)
 {
         return ((const uint8_t *)p)[0] << 8 | ((const uint8_t *)p)[1];
 }

 static inline uint32_t sg_get_unaligned_be32(const void *p)
 {
         return ((const uint8_t *)p)[0] << 24 | ((const uint8_t *)p)[1] << 16 |
                 ((const uint8_t *)p)[2] << 8 | ((const uint8_t *)p)[3];
 }

 static inline uint64_t sg_get_unaligned_be64(const void *p)
 {
         return (uint64_t)sg_get_unaligned_be32(p) << 32 |
                sg_get_unaligned_be32((const uint8_t *)p + 4);
 }

 static inline void sg_put_unaligned_be16(uint16_t val, void *p)
 {
         ((uint8_t *)p)[0] = (uint8_t)(val >> 8);
         ((uint8_t *)p)[1] = (uint8_t)val;
 }

 static inline void sg_put_unaligned_be32(uint32_t val, void *p)
 {
         sg_put_unaligned_be16(val >> 16, p);
         sg_put_unaligned_be16(val, (uint8_t *)p + 2);
 }

 static inline void sg_put_unaligned_be64(uint64_t val, void *p)
 {
         sg_put_unaligned_be32(val >> 32, p);
         sg_put_unaligned_be32(val, (uint8_t *)p + 4);
 }


 static inline uint16_t sg_get_unaligned_le16(const void *p)
 {
         return ((const uint8_t *)p)[1] << 8 | ((const uint8_t *)p)[0];
 }

 static inline uint32_t sg_get_unaligned_le32(const void *p)
 {
         return ((const uint8_t *)p)[3] << 24 | ((const uint8_t *)p)[2] << 16 |
                 ((const uint8_t *)p)[1] << 8 | ((const uint8_t *)p)[0];
 }

 static inline uint64_t sg_get_unaligned_le64(const void *p)
 {
         return (uint64_t)sg_get_unaligned_le32((const uint8_t *)p + 4) << 32 |
                sg_get_unaligned_le32(p);
 }

 static inline void sg_put_unaligned_le16(uint16_t val, void *p)
 {
         ((uint8_t *)p)[0] = val & 0xff;
         ((uint8_t *)p)[1] = val >> 8;
 }

 static inline void sg_put_unaligned_le32(uint32_t val, void *p)
 {
         sg_put_unaligned_le16(val >> 16, (uint8_t *)p + 2);
         sg_put_unaligned_le16(val, p);
 }

 static inline void sg_put_unaligned_le64(uint64_t val, void *p)
 {
         sg_put_unaligned_le32(val >> 32, (uint8_t *)p + 4);
         sg_put_unaligned_le32(val, p);
 }

 #endif          /* #ifndef GOT_UNALIGNED_SPECIALS */

 /* Following are lesser used conversions that don't have specializations
  * for endianness; big endian first. In summary these are the 24, 48 bit and
  * given-length conversions plus the "nz" conditional put conversions. */

 /* Now big endian, get 24+48 then put 24+48 */
 static inline uint32_t sg_get_unaligned_be24(const void *p)
 {
         return ((const uint8_t *)p)[0] << 16 | ((const uint8_t *)p)[1] << 8 |
                ((const uint8_t *)p)[2];
 }

 /* Assume 48 bit value placed in uint64_t */
 static inline uint64_t sg_get_unaligned_be48(const void *p)
 {
         return (uint64_t)sg_get_unaligned_be16(p) << 32 |
                sg_get_unaligned_be32((const uint8_t *)p + 2);
 }

 /* Returns 0 if 'num_bytes' is less than or equal to 0 or greater than
  * 8 (i.e. sizeof(uint64_t)). Else returns result in uint64_t which is
  * an 8 byte unsigned integer. */
 static inline uint64_t sg_get_unaligned_be(int num_bytes, const void *p)
 {
         if ((num_bytes <= 0) || (num_bytes > (int)sizeof(uint64_t)))
                 return 0;
         else {
                 const uint8_t * xp = (const uint8_t *)p;
                 uint64_t res = *xp;

                 for (++xp; num_bytes > 1; ++xp, --num_bytes)
                         res = (res << 8) | *xp;
                 return res;
         }
 }

 static inline void sg_put_unaligned_be24(uint32_t val, void *p)
 {
         ((uint8_t *)p)[0] = (val >> 16) & 0xff;
         ((uint8_t *)p)[1] = (val >> 8) & 0xff;
         ((uint8_t *)p)[2] = val & 0xff;
 }

 /* Assume 48 bit value placed in uint64_t */
 static inline void sg_put_unaligned_be48(uint64_t val, void *p)
 {
         sg_put_unaligned_be16(val >> 32, p);
         sg_put_unaligned_be32(val, (uint8_t *)p + 2);
 }

 /* Now little endian, get 24+48 then put 24+48 */
 static inline uint32_t sg_get_unaligned_le24(const void *p)
 {
         return (uint32_t)sg_get_unaligned_le16(p) |
                ((const uint8_t *)p)[2] << 16;
 }

 /* Assume 48 bit value placed in uint64_t */
 static inline uint64_t sg_get_unaligned_le48(const void *p)
 {
         return (uint64_t)sg_get_unaligned_le16((const uint8_t *)p + 4) << 32 |
                sg_get_unaligned_le32(p);
 }

 static inline void sg_put_unaligned_le24(uint32_t val, void *p)
 {
         ((uint8_t *)p)[2] = (val >> 16) & 0xff;
         ((uint8_t *)p)[1] = (val >> 8) & 0xff;
         ((uint8_t *)p)[0] = val & 0xff;
 }

 /* Assume 48 bit value placed in uint64_t */
 static inline void sg_put_unaligned_le48(uint64_t val, void *p)
 {
         ((uint8_t *)p)[5] = (val >> 40) & 0xff;
         ((uint8_t *)p)[4] = (val >> 32) & 0xff;
         ((uint8_t *)p)[3] = (val >> 24) & 0xff;
         ((uint8_t *)p)[2] = (val >> 16) & 0xff;
         ((uint8_t *)p)[1] = (val >> 8) & 0xff;
         ((uint8_t *)p)[0] = val & 0xff;
 }

 /* Returns 0 if 'num_bytes' is less than or equal to 0 or greater than
  * 8 (i.e. sizeof(uint64_t)). Else returns result in uint64_t which is
  * an 8 byte unsigned integer. */
 static inline uint64_t sg_get_unaligned_le(int num_bytes, const void *p)
 {
         if ((num_bytes <= 0) || (num_bytes > (int)sizeof(uint64_t)))
                 return 0;
         else {
                 const uint8_t * xp = (const uint8_t *)p + (num_bytes - 1);
                 uint64_t res = *xp;

                 for (--xp; num_bytes > 1; --xp, --num_bytes)
                         res = (res << 8) | *xp;
                 return res;
         }
 }

 /* Since cdb and parameter blocks are often memset to zero before these
  * unaligned function partially fill them, then check for a val of zero
  * and ignore if it is with these variants. First big endian, then little */
 static inline void sg_nz_put_unaligned_be16(uint16_t val, void *p)
 {
         if (val)
                 sg_put_unaligned_be16(val, p);
 }

 static inline void sg_nz_put_unaligned_be24(uint32_t val, void *p)
 {
         if (val) {
                 ((uint8_t *)p)[0] = (val >> 16) & 0xff;
                 ((uint8_t *)p)[1] = (val >> 8) & 0xff;
                 ((uint8_t *)p)[2] = val & 0xff;
         }
 }

 static inline void sg_nz_put_unaligned_be32(uint32_t val, void *p)
 {
         if (val)
                 sg_put_unaligned_be32(val, p);
 }

 static inline void sg_nz_put_unaligned_be64(uint64_t val, void *p)
 {
         if (val)
             sg_put_unaligned_be64(val, p);
 }

 static inline void sg_nz_put_unaligned_le16(uint16_t val, void *p)
 {
         if (val)
                 sg_put_unaligned_le16(val, p);
 }

 static inline void sg_nz_put_unaligned_le24(uint32_t val, void *p)
 {
         if (val) {
                 ((uint8_t *)p)[2] = (val >> 16) & 0xff;
                 ((uint8_t *)p)[1] = (val >> 8) & 0xff;
                 ((uint8_t *)p)[0] = val & 0xff;
         }
 }

 static inline void sg_nz_put_unaligned_le32(uint32_t val, void *p)
 {
         if (val)
                 sg_put_unaligned_le32(val, p);
 }

 static inline void sg_nz_put_unaligned_le64(uint64_t val, void *p)
 {
         if (val)
             sg_put_unaligned_le64(val, p);
 }


 #ifdef __cplusplus
 }
 #endif

 #endif /* SG_UNALIGNED_H */
	#ifndef SG_UNALIGNED_H
	#define SG_UNALIGNED_H

	/*
	* Copyright (c) 2014-2018 Douglas Gilbert.
	* All rights reserved.
	* Use of this source code is governed by a BSD-style
	* license that can be found in the BSD_LICENSE file.
	*
	* SPDX-License-Identifier: BSD-2-Clause
	*/

	#include <stdbool.h>
	#include <stdint.h> /* for uint8_t and friends */
	#include <string.h> /* for memcpy */

	#ifdef __cplusplus
	extern "C" {
	#endif

	/* These inline functions convert integers (always unsigned) to byte streams
	* and vice versa. They have two goals:
	* - change the byte ordering of integers between host order and big
	* endian ("_be") or little endian ("_le")
	* - copy the big or little endian byte stream so it complies with any
	* alignment that host integers require
	*
	* Host integer to given endian byte stream is a "_put_" function taking
	* two arguments (integer and pointer to byte stream) returning void.
	* Given endian byte stream to host integer is a "_get_" function that takes
	* one argument and returns an integer of appropriate size (uint32_t for 24
	* bit operations, uint64_t for 48 bit operations).
	*
	* Big endian byte format "on the wire" is the default used by SCSI
	* standards (www.t10.org). Big endian is also the network byte order.
	* Little endian is used by ATA, PCI and NVMe.
	*/

	/* The generic form of these routines was borrowed from the Linux kernel,
	* via mhvtl. There is a specialised version of the main functions for
	* little endian or big endian provided that not-quite-standard defines for
	* endianness are available from the compiler and the <byteswap.h> header
	* (a GNU extension) has been detected by ./configure . To force the
	* generic version, use './configure --disable-fast-lebe ' . */

	/* Note: Assumes that the source and destination locations do not overlap.
	* An example of overlapping source and destination:
	* sg_put_unaligned_le64(j, ((uint8_t *)&j) + 1);
	* Best not to do things like that.
	*/


	#ifdef HAVE_CONFIG_H
	#include "config.h" /* need this to see if HAVE_BYTESWAP_H */
	#endif

	#undef GOT_UNALIGNED_SPECIALS /* just in case */

	#if defined(__BYTE_ORDER__) && defined(HAVE_BYTESWAP_H) && \
	! defined(IGNORE_FAST_LEBE)

	#if defined(__LITTLE_ENDIAN__) \|\| (__BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__)

	#define GOT_UNALIGNED_SPECIALS 1

	#include <byteswap.h> /* for bswap_16(), bswap_32() and bswap_64() */

	// #warning ">>>>>> Doing Little endian special unaligneds"

	static inline uint16_t sg_get_unaligned_be16(const void *p)
	{
	uint16_t u;

	memcpy(&u, p, 2);
	return bswap_16(u);
	}

	static inline uint32_t sg_get_unaligned_be32(const void *p)
	{
	uint32_t u;

	memcpy(&u, p, 4);
	return bswap_32(u);
	}

	static inline uint64_t sg_get_unaligned_be64(const void *p)
	{
	uint64_t u;

	memcpy(&u, p, 8);
	return bswap_64(u);
	}

	static inline void sg_put_unaligned_be16(uint16_t val, void *p)
	{
	uint16_t u = bswap_16(val);

	memcpy(p, &u, 2);
	}

	static inline void sg_put_unaligned_be32(uint32_t val, void *p)
	{
	uint32_t u = bswap_32(val);

	memcpy(p, &u, 4);
	}

	static inline void sg_put_unaligned_be64(uint64_t val, void *p)
	{
	uint64_t u = bswap_64(val);

	memcpy(p, &u, 8);
	}

	static inline uint16_t sg_get_unaligned_le16(const void *p)
	{
	uint16_t u;

	memcpy(&u, p, 2);
	return u;
	}

	static inline uint32_t sg_get_unaligned_le32(const void *p)
	{
	uint32_t u;

	memcpy(&u, p, 4);
	return u;
	}

	static inline uint64_t sg_get_unaligned_le64(const void *p)
	{
	uint64_t u;

	memcpy(&u, p, 8);
	return u;
	}

	static inline void sg_put_unaligned_le16(uint16_t val, void *p)
	{
	memcpy(p, &val, 2);
	}

	static inline void sg_put_unaligned_le32(uint32_t val, void *p)
	{
	memcpy(p, &val, 4);
	}

	static inline void sg_put_unaligned_le64(uint64_t val, void *p)
	{
	memcpy(p, &val, 8);
	}

	#elif defined(__BIG_ENDIAN__) \|\| (__BYTE_ORDER__ == __ORDER_BIG_ENDIAN__)

	#define GOT_UNALIGNED_SPECIALS 1

	#include <byteswap.h>

	// #warning ">>>>>> Doing BIG endian special unaligneds"

	static inline uint16_t sg_get_unaligned_le16(const void *p)
	{
	uint16_t u;

	memcpy(&u, p, 2);
	return bswap_16(u);
	}

	static inline uint32_t sg_get_unaligned_le32(const void *p)
	{
	uint32_t u;

	memcpy(&u, p, 4);
	return bswap_32(u);
	}

	static inline uint64_t sg_get_unaligned_le64(const void *p)
	{
	uint64_t u;

	memcpy(&u, p, 8);
	return bswap_64(u);
	}

	static inline void sg_put_unaligned_le16(uint16_t val, void *p)
	{
	uint16_t u = bswap_16(val);

	memcpy(p, &u, 2);
	}

	static inline void sg_put_unaligned_le32(uint32_t val, void *p)
	{
	uint32_t u = bswap_32(val);

	memcpy(p, &u, 4);
	}

	static inline void sg_put_unaligned_le64(uint64_t val, void *p)
	{
	uint64_t u = bswap_64(val);

	memcpy(p, &u, 8);
	}

	static inline uint16_t sg_get_unaligned_be16(const void *p)
	{
	uint16_t u;

	memcpy(&u, p, 2);
	return u;
	}

	static inline uint32_t sg_get_unaligned_be32(const void *p)
	{
	uint32_t u;

	memcpy(&u, p, 4);
	return u;
	}

	static inline uint64_t sg_get_unaligned_be64(const void *p)
	{
	uint64_t u;

	memcpy(&u, p, 8);
	return u;
	}

	static inline void sg_put_unaligned_be16(uint16_t val, void *p)
	{
	memcpy(p, &val, 2);
	}

	static inline void sg_put_unaligned_be32(uint32_t val, void *p)
	{
	memcpy(p, &val, 4);
	}

	static inline void sg_put_unaligned_be64(uint64_t val, void *p)
	{
	memcpy(p, &val, 8);
	}

	#endif /* __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ */
	#endif /* #if defined __BYTE_ORDER__ && defined <byteswap.h> &&
	* ! defined IGNORE_FAST_LEBE */


	#ifndef GOT_UNALIGNED_SPECIALS

	/* Now we have no tricks left, so use the only way this can be done
	* correctly in C safely: lots of shifts. */

	// #warning ">>>>>> Doing GENERIC unaligneds"

	static inline uint16_t sg_get_unaligned_be16(const void *p)
	{
	return ((const uint8_t )p)[0] << 8 \| ((const uint8_t )p)[1];
	}

	static inline uint32_t sg_get_unaligned_be32(const void *p)
	{
	return ((const uint8_t )p)[0] << 24 \| ((const uint8_t )p)[1] << 16 \|
	((const uint8_t )p)[2] << 8 \| ((const uint8_t )p)[3];
	}

	static inline uint64_t sg_get_unaligned_be64(const void *p)
	{
	return (uint64_t)sg_get_unaligned_be32(p) << 32 \|
	sg_get_unaligned_be32((const uint8_t *)p + 4);
	}

	static inline void sg_put_unaligned_be16(uint16_t val, void *p)
	{
	((uint8_t *)p)[0] = (uint8_t)(val >> 8);
	((uint8_t *)p)[1] = (uint8_t)val;
	}

	static inline void sg_put_unaligned_be32(uint32_t val, void *p)
	{
	sg_put_unaligned_be16(val >> 16, p);
	sg_put_unaligned_be16(val, (uint8_t *)p + 2);
	}

	static inline void sg_put_unaligned_be64(uint64_t val, void *p)
	{
	sg_put_unaligned_be32(val >> 32, p);
	sg_put_unaligned_be32(val, (uint8_t *)p + 4);
	}


	static inline uint16_t sg_get_unaligned_le16(const void *p)
	{
	return ((const uint8_t )p)[1] << 8 \| ((const uint8_t )p)[0];
	}

	static inline uint32_t sg_get_unaligned_le32(const void *p)
	{
	return ((const uint8_t )p)[3] << 24 \| ((const uint8_t )p)[2] << 16 \|
	((const uint8_t )p)[1] << 8 \| ((const uint8_t )p)[0];
	}

	static inline uint64_t sg_get_unaligned_le64(const void *p)
	{
	return (uint64_t)sg_get_unaligned_le32((const uint8_t *)p + 4) << 32 \|
	sg_get_unaligned_le32(p);
	}

	static inline void sg_put_unaligned_le16(uint16_t val, void *p)
	{
	((uint8_t *)p)[0] = val & 0xff;
	((uint8_t *)p)[1] = val >> 8;
	}

	static inline void sg_put_unaligned_le32(uint32_t val, void *p)
	{
	sg_put_unaligned_le16(val >> 16, (uint8_t *)p + 2);
	sg_put_unaligned_le16(val, p);
	}

	static inline void sg_put_unaligned_le64(uint64_t val, void *p)
	{
	sg_put_unaligned_le32(val >> 32, (uint8_t *)p + 4);
	sg_put_unaligned_le32(val, p);
	}

	#endif /* #ifndef GOT_UNALIGNED_SPECIALS */

	/* Following are lesser used conversions that don't have specializations
	* for endianness; big endian first. In summary these are the 24, 48 bit and
	* given-length conversions plus the "nz" conditional put conversions. */

	/* Now big endian, get 24+48 then put 24+48 */
	static inline uint32_t sg_get_unaligned_be24(const void *p)
	{
	return ((const uint8_t )p)[0] << 16 \| ((const uint8_t )p)[1] << 8 \|
	((const uint8_t *)p)[2];
	}

	/* Assume 48 bit value placed in uint64_t */
	static inline uint64_t sg_get_unaligned_be48(const void *p)
	{
	return (uint64_t)sg_get_unaligned_be16(p) << 32 \|
	sg_get_unaligned_be32((const uint8_t *)p + 2);
	}

	/* Returns 0 if 'num_bytes' is less than or equal to 0 or greater than
	* 8 (i.e. sizeof(uint64_t)). Else returns result in uint64_t which is
	* an 8 byte unsigned integer. */
	static inline uint64_t sg_get_unaligned_be(int num_bytes, const void *p)
	{
	if ((num_bytes <= 0) \|\| (num_bytes > (int)sizeof(uint64_t)))
	return 0;
	else {
	const uint8_t * xp = (const uint8_t *)p;
	uint64_t res = *xp;

	for (++xp; num_bytes > 1; ++xp, --num_bytes)
	res = (res << 8) \| *xp;
	return res;
	}
	}

	static inline void sg_put_unaligned_be24(uint32_t val, void *p)
	{
	((uint8_t *)p)[0] = (val >> 16) & 0xff;
	((uint8_t *)p)[1] = (val >> 8) & 0xff;
	((uint8_t *)p)[2] = val & 0xff;
	}

	/* Assume 48 bit value placed in uint64_t */
	static inline void sg_put_unaligned_be48(uint64_t val, void *p)
	{
	sg_put_unaligned_be16(val >> 32, p);
	sg_put_unaligned_be32(val, (uint8_t *)p + 2);
	}

	/* Now little endian, get 24+48 then put 24+48 */
	static inline uint32_t sg_get_unaligned_le24(const void *p)
	{
	return (uint32_t)sg_get_unaligned_le16(p) \|
	((const uint8_t *)p)[2] << 16;
	}

	/* Assume 48 bit value placed in uint64_t */
	static inline uint64_t sg_get_unaligned_le48(const void *p)
	{
	return (uint64_t)sg_get_unaligned_le16((const uint8_t *)p + 4) << 32 \|
	sg_get_unaligned_le32(p);
	}

	static inline void sg_put_unaligned_le24(uint32_t val, void *p)
	{
	((uint8_t *)p)[2] = (val >> 16) & 0xff;
	((uint8_t *)p)[1] = (val >> 8) & 0xff;
	((uint8_t *)p)[0] = val & 0xff;
	}

	/* Assume 48 bit value placed in uint64_t */
	static inline void sg_put_unaligned_le48(uint64_t val, void *p)
	{
	((uint8_t *)p)[5] = (val >> 40) & 0xff;
	((uint8_t *)p)[4] = (val >> 32) & 0xff;
	((uint8_t *)p)[3] = (val >> 24) & 0xff;
	((uint8_t *)p)[2] = (val >> 16) & 0xff;
	((uint8_t *)p)[1] = (val >> 8) & 0xff;
	((uint8_t *)p)[0] = val & 0xff;
	}

	/* Returns 0 if 'num_bytes' is less than or equal to 0 or greater than
	* 8 (i.e. sizeof(uint64_t)). Else returns result in uint64_t which is
	* an 8 byte unsigned integer. */
	static inline uint64_t sg_get_unaligned_le(int num_bytes, const void *p)
	{
	if ((num_bytes <= 0) \|\| (num_bytes > (int)sizeof(uint64_t)))
	return 0;
	else {
	const uint8_t * xp = (const uint8_t *)p + (num_bytes - 1);
	uint64_t res = *xp;

	for (--xp; num_bytes > 1; --xp, --num_bytes)
	res = (res << 8) \| *xp;
	return res;
	}
	}

	/* Since cdb and parameter blocks are often memset to zero before these
	* unaligned function partially fill them, then check for a val of zero
	* and ignore if it is with these variants. First big endian, then little */
	static inline void sg_nz_put_unaligned_be16(uint16_t val, void *p)
	{
	if (val)
	sg_put_unaligned_be16(val, p);
	}

	static inline void sg_nz_put_unaligned_be24(uint32_t val, void *p)
	{
	if (val) {
	((uint8_t *)p)[0] = (val >> 16) & 0xff;
	((uint8_t *)p)[1] = (val >> 8) & 0xff;
	((uint8_t *)p)[2] = val & 0xff;
	}
	}

	static inline void sg_nz_put_unaligned_be32(uint32_t val, void *p)
	{
	if (val)
	sg_put_unaligned_be32(val, p);
	}

	static inline void sg_nz_put_unaligned_be64(uint64_t val, void *p)
	{
	if (val)
	sg_put_unaligned_be64(val, p);
	}

	static inline void sg_nz_put_unaligned_le16(uint16_t val, void *p)
	{
	if (val)
	sg_put_unaligned_le16(val, p);
	}

	static inline void sg_nz_put_unaligned_le24(uint32_t val, void *p)
	{
	if (val) {
	((uint8_t *)p)[2] = (val >> 16) & 0xff;
	((uint8_t *)p)[1] = (val >> 8) & 0xff;
	((uint8_t *)p)[0] = val & 0xff;
	}
	}

	static inline void sg_nz_put_unaligned_le32(uint32_t val, void *p)
	{
	if (val)
	sg_put_unaligned_le32(val, p);
	}

	static inline void sg_nz_put_unaligned_le64(uint64_t val, void *p)
	{
	if (val)
	sg_put_unaligned_le64(val, p);
	}


	#ifdef __cplusplus
	}
	#endif

	#endif /* SG_UNALIGNED_H */