85b62edb84
them visible from userland, if need be. I wish that the C language contained this as part of struct definintions, but failing that, I would settle for an agreed upon set of functions for packing/unpacking integers in various sizes from byte-streams which may have unfriendly alignment. This really belongs in <sys/endian.h> I guess.
120 lines
3.1 KiB
C
120 lines
3.1 KiB
C
/*-
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* Copyright (c) 2002 Poul-Henning Kamp
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* Copyright (c) 2002 Networks Associates Technology, Inc.
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* All rights reserved.
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*
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* This software was developed for the FreeBSD Project by Poul-Henning Kamp
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* and NAI Labs, the Security Research Division of Network Associates, Inc.
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* under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
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* DARPA CHATS research program.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The names of the authors may not be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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/*
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* This file contains routines to pack and unpack integerfields of varying
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* width and endianess with. Ideally the C language would have this built
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* in but I guess Dennis and Brian forgot that back in the early 70ies.
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*
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* The function names are systematic: g_{enc|dec}_{be|le}%d
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* enc -> encode
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* dec -> decode
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* be -> big endian
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* le -> little endian
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* %d -> width in bytes
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*
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* Please keep the functions sorted:
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* decode before encode
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* big endian before little endian
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* small width before larger width
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* (this happens to be alphabetically)
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*/
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#include <sys/param.h>
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#ifdef _KERNEL
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#include <sys/malloc.h>
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#include <sys/systm.h>
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#endif
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#include <geom/geom.h>
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#include <geom/geom_int.h>
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uint32_t
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g_dec_be2(u_char *p)
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{
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return((p[0] << 8) | p[1]);
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}
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uint32_t
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g_dec_be4(u_char *p)
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{
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return((p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3]);
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}
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uint32_t
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g_dec_le2(u_char *p)
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{
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return((p[1] << 8) | p[0]);
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}
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uint32_t
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g_dec_le4(u_char *p)
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{
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return((p[3] << 24) | (p[2] << 16) | (p[1] << 8) | p[0]);
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}
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void
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g_enc_le4(u_char *p, uint32_t u)
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{
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p[0] = u & 0xff;
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p[1] = (u >> 8) & 0xff;
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p[2] = (u >> 16) & 0xff;
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p[3] = (u >> 24) & 0xff;
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}
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uint64_t
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g_dec_le8(u_char *p)
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{
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return(g_dec_le4(p) | ((uint64_t)(g_dec_le4(p + 4)) << 32));
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}
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void
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g_enc_le8(u_char *p, uint64_t u)
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{
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g_enc_le4(p, u);
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g_enc_le4(p + 4, u >> 32);
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}
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