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Filename : util.h
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/*
 * Portions Copyright (C) Internet Systems Consortium, Inc. ("ISC")
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, you can obtain one at https://mozilla.org/MPL/2.0/.
 *
 * See the COPYRIGHT file distributed with this work for additional
 * information regarding copyright ownership.
 *
 * Portions Copyright (C) 2001 Nominum, Inc.
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC AND NOMINUM DISCLAIMS ALL
 * WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY
 * SPECIAL, DIRECT, 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.
 */

#ifndef ISCCC_UTIL_H
#define ISCCC_UTIL_H 1

#include <inttypes.h>

#include <isc/util.h>

/*! \file isccc/util.h
 * \brief
 * Macros for dealing with unaligned numbers.
 *
 * \note no side effects are allowed when invoking these macros!
 */

#define GET8(v, w)      \
	do {            \
		v = *w; \
		w++;    \
	} while (0)

#define GET16(v, w)                          \
	do {                                 \
		v = (unsigned int)w[0] << 8; \
		v |= (unsigned int)w[1];     \
		w += 2;                      \
	} while (0)

#define GET24(v, w)                           \
	do {                                  \
		v = (unsigned int)w[0] << 16; \
		v |= (unsigned int)w[1] << 8; \
		v |= (unsigned int)w[2];      \
		w += 3;                       \
	} while (0)

#define GET32(v, w)                            \
	do {                                   \
		v = (unsigned int)w[0] << 24;  \
		v |= (unsigned int)w[1] << 16; \
		v |= (unsigned int)w[2] << 8;  \
		v |= (unsigned int)w[3];       \
		w += 4;                        \
	} while (0)

#define GET64(v, w)                        \
	do {                               \
		v = (uint64_t)w[0] << 56;  \
		v |= (uint64_t)w[1] << 48; \
		v |= (uint64_t)w[2] << 40; \
		v |= (uint64_t)w[3] << 32; \
		v |= (uint64_t)w[4] << 24; \
		v |= (uint64_t)w[5] << 16; \
		v |= (uint64_t)w[6] << 8;  \
		v |= (uint64_t)w[7];       \
		w += 8;                    \
	} while (0)

#define GETC16(v, w, d)                      \
	do {                                 \
		GET8(v, w);                  \
		if (v == 0) {                \
			d = ISCCC_TRUE;      \
		} else {                     \
			d = ISCCC_FALSE;     \
			if (v == 255)        \
				GET16(v, w); \
		}                            \
	} while (0)

#define GETC32(v, w)                  \
	do {                          \
		GET24(v, w);          \
		if (v == 0xffffffu) { \
			GET32(v, w);  \
		}                     \
	} while (0)

#define GET_OFFSET(v, w) GET32(v, w)

#define GET_MEM(v, c, w)          \
	do {                      \
		memmove(v, w, c); \
		w += c;           \
	} while (0)

#define GET_TYPE(v, w)                                                        \
	do {                                                                  \
		GET8(v, w);                                                   \
		if (v > 127) {                                                \
			if (v < 255) {                                        \
				v = ((v & 0x7f) << 16) | ISCCC_RDATATYPE_SIG; \
			} else {                                              \
				GET32(v, w);                                  \
			}                                                     \
		}                                                             \
	} while (0)

#define PUT8(v, w)                      \
	do {                            \
		*w = (v & 0x000000ffU); \
		w++;                    \
	} while (0)

#define PUT16(v, w)                            \
	do {                                   \
		w[0] = (v & 0x0000ff00U) >> 8; \
		w[1] = (v & 0x000000ffU);      \
		w += 2;                        \
	} while (0)

#define PUT24(v, w)                             \
	do {                                    \
		w[0] = (v & 0x00ff0000U) >> 16; \
		w[1] = (v & 0x0000ff00U) >> 8;  \
		w[2] = (v & 0x000000ffU);       \
		w += 3;                         \
	} while (0)

#define PUT32(v, w)                             \
	do {                                    \
		w[0] = (v & 0xff000000U) >> 24; \
		w[1] = (v & 0x00ff0000U) >> 16; \
		w[2] = (v & 0x0000ff00U) >> 8;  \
		w[3] = (v & 0x000000ffU);       \
		w += 4;                         \
	} while (0)

#define PUT64(v, w)                                       \
	do {                                              \
		w[0] = (v & 0xff00000000000000ULL) >> 56; \
		w[1] = (v & 0x00ff000000000000ULL) >> 48; \
		w[2] = (v & 0x0000ff0000000000ULL) >> 40; \
		w[3] = (v & 0x000000ff00000000ULL) >> 32; \
		w[4] = (v & 0x00000000ff000000ULL) >> 24; \
		w[5] = (v & 0x0000000000ff0000ULL) >> 16; \
		w[6] = (v & 0x000000000000ff00ULL) >> 8;  \
		w[7] = (v & 0x00000000000000ffULL);       \
		w += 8;                                   \
	} while (0)

#define PUTC16(v, w)                    \
	do {                            \
		if (v > 0 && v < 255) { \
			PUT8(v, w);     \
		} else {                \
			PUT8(255, w);   \
			PUT16(v, w);    \
		}                       \
	} while (0)

#define PUTC32(v, w)                         \
	do {                                 \
		if (v < 0xffffffU) {         \
			PUT24(v, w);         \
		} else {                     \
			PUT24(0xffffffU, w); \
			PUT32(v, w);         \
		}                            \
	} while (0)

#define PUT_OFFSET(v, w) PUT32(v, w)

#include <string.h>

#define PUT_MEM(s, c, w)          \
	do {                      \
		memmove(w, s, c); \
		w += c;           \
	} while (0)

/*
 * Regions.
 */
#define REGION_SIZE(r)	((unsigned int)((r).rend - (r).rstart))
#define REGION_EMPTY(r) ((r).rstart == (r).rend)
#define REGION_FROMSTRING(r, s)                    \
	do {                                       \
		(r).rstart = (unsigned char *)s;   \
		(r).rend = (r).rstart + strlen(s); \
	} while (0)

/*%
 * Use this to remove the const qualifier of a variable to assign it to
 * a non-const variable or pass it as a non-const function argument ...
 * but only when you are sure it won't then be changed!
 * This is necessary to sometimes shut up some compilers
 * (as with gcc -Wcast-qual) when there is just no other good way to avoid the
 * situation.
 */
#define DE_CONST(konst, var)           \
	do {                           \
		union {                \
			const void *k; \
			void	     *v; \
		} _u;                  \
		_u.k = konst;          \
		var = _u.v;            \
	} while (0)

#endif /* ISCCC_UTIL_H */