util.h 4.82 KB
Newer Older
1
/*
2 3
 * Portions Copyright (C) 2001  Internet Software Consortium.
 * Portions Copyright (C) 2001  Nominum, Inc.
4 5 6 7 8
 *
 * Permission to use, copy, modify, and 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.
 *
9 10 11 12 13 14 15 16
 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM AND
 * NOMINUM DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING
 * ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT
 * SHALL INTERNET SOFTWARE CONSORTIUM OR NOMINUM 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.
17 18
 */

19
/* $Id: util.h,v 1.2 2001/03/27 20:08:15 bwelling Exp $ */
20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221

#ifndef ISCCC_UTIL_H
#define ISCCC_UTIL_H 1

#include <isc/util.h>

/*
 * 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 = (isc_uint64_t)w[0] << 56; \
 		v |= (isc_uint64_t)w[1] << 48; \
 		v |= (isc_uint64_t)w[2] << 40; \
 		v |= (isc_uint64_t)w[3] << 32; \
 		v |= (isc_uint64_t)w[4] << 24; \
 		v |= (isc_uint64_t)w[5] << 16; \
 		v |= (isc_uint64_t)w[6] << 8; \
 		v |= (isc_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 { \
		memcpy(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 { \
		memcpy(w, s, c); \
		w += c; \
	} while (0)

/*
 * Byte swapping
 */
#include <sys/types.h>
#include <netinet/in.h>
#include <arpa/inet.h>

#define N2HO(v)				ntohl(v)
#define H2NO(v)				htonl(v)

/*
 * 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 */