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byteorder.c
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byteorder.c
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/* byteorder.c -- convert 32 and 64-bit values between host and network byte order
*
* Copyright (c) 1994-2008 Carnegie Mellon University. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The name "Carnegie Mellon University" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For permission or any legal
* details, please contact
* Carnegie Mellon University
* Center for Technology Transfer and Enterprise Creation
* 4615 Forbes Avenue
* Suite 302
* Pittsburgh, PA 15213
* (412) 268-7393, fax: (412) 268-7395
* innovation@andrew.cmu.edu
*
* 4. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by Computing Services
* at Carnegie Mellon University (http://www.cmu.edu/computing/)."
*
* CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO
* THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE
* FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
* AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <config.h>
#include "byteorder.h"
#ifdef CYRUS_BYTESWAP
#include <netinet/in.h>
/* Structure used to swap the bytes in a 64-bit uint64_t. */
union byteswap_64_u {
uint64_t a;
uint32_t b[2];
};
/* Function to byteswap 64bit unsigned integers on
* little endian machines to big endian network order.
* On big endian machines this will be a null macro.
* The macro htonll() is defined in byteorder.h,
* and if needed refers to _htonll() here.
*/
EXPORTED uint64_t _htonll(uint64_t x)
{
union byteswap_64_u u1;
union byteswap_64_u u2;
u1.a = x;
u2.b[0] = htonl(u1.b[1]);
u2.b[1] = htonl(u1.b[0]);
return u2.a;
}
/* Function to byteswap big endian 64bit unsigned integers
* back to little endian host order on little endian machines.
* As above, on big endian machines this will be a null macro.
* The macro ntohll() is defined in byteorder.h, and if needed,
* refers to _ntohll() here.
*/
EXPORTED uint64_t _ntohll(uint64_t x)
{
union byteswap_64_u u1;
union byteswap_64_u u2;
u1.a = x;
u2.b[1] = ntohl(u1.b[0]);
u2.b[0] = ntohl(u1.b[1]);
return u2.a;
}
#endif /* CYRUS_BYTESWAP */
#include <string.h>
EXPORTED void *align_htonll(void *dst, uint64_t src)
{
uint64_t tmp = htonll(src);
return memcpy(dst, (void *) &tmp, sizeof(uint64_t));
}
EXPORTED uint64_t align_ntohll(const void *src)
{
uint64_t dst;
memcpy((void *) &dst, src, sizeof(uint64_t));
return ntohll(dst);
}

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byteorder.c (3 KB)

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