Annotation of embedaddon/dhcp/omapip/convert.c, revision 1.1
1.1 ! misho 1: /* convert.c
! 2:
! 3: Safe copying of option values into and out of the option buffer, which
! 4: can't be assumed to be aligned. */
! 5:
! 6: /*
! 7: * Copyright (c) 2004,2007,2009 by Internet Systems Consortium, Inc. ("ISC")
! 8: * Copyright (c) 1996-2003 by Internet Software Consortium
! 9: *
! 10: * Permission to use, copy, modify, and distribute this software for any
! 11: * purpose with or without fee is hereby granted, provided that the above
! 12: * copyright notice and this permission notice appear in all copies.
! 13: *
! 14: * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
! 15: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
! 16: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
! 17: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
! 18: * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
! 19: * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
! 20: * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
! 21: *
! 22: * Internet Systems Consortium, Inc.
! 23: * 950 Charter Street
! 24: * Redwood City, CA 94063
! 25: * <info@isc.org>
! 26: * https://www.isc.org/
! 27: *
! 28: * This software has been written for Internet Systems Consortium
! 29: * by Ted Lemon in cooperation with Vixie Enterprises and Nominum, Inc.
! 30: * To learn more about Internet Systems Consortium, see
! 31: * ``https://www.isc.org/''. To learn more about Vixie Enterprises,
! 32: * see ``http://www.vix.com''. To learn more about Nominum, Inc., see
! 33: * ``http://www.nominum.com''.
! 34: */
! 35:
! 36: #include "dhcpd.h"
! 37:
! 38: #include <omapip/omapip_p.h>
! 39:
! 40: u_int32_t getULong (buf)
! 41: const unsigned char *buf;
! 42: {
! 43: u_int32_t ibuf;
! 44:
! 45: memcpy (&ibuf, buf, sizeof (u_int32_t));
! 46: return ntohl (ibuf);
! 47: }
! 48:
! 49: int32_t getLong (buf)
! 50: const unsigned char *buf;
! 51: {
! 52: int32_t ibuf;
! 53:
! 54: memcpy (&ibuf, buf, sizeof (int32_t));
! 55: return ntohl (ibuf);
! 56: }
! 57:
! 58: u_int32_t getUShort (buf)
! 59: const unsigned char *buf;
! 60: {
! 61: unsigned short ibuf;
! 62:
! 63: memcpy (&ibuf, buf, sizeof (u_int16_t));
! 64: return ntohs (ibuf);
! 65: }
! 66:
! 67: int32_t getShort (buf)
! 68: const unsigned char *buf;
! 69: {
! 70: short ibuf;
! 71:
! 72: memcpy (&ibuf, buf, sizeof (int16_t));
! 73: return ntohs (ibuf);
! 74: }
! 75:
! 76: void putULong (obuf, val)
! 77: unsigned char *obuf;
! 78: u_int32_t val;
! 79: {
! 80: u_int32_t tmp = htonl (val);
! 81: memcpy (obuf, &tmp, sizeof tmp);
! 82: }
! 83:
! 84: void putLong (obuf, val)
! 85: unsigned char *obuf;
! 86: int32_t val;
! 87: {
! 88: int32_t tmp = htonl (val);
! 89: memcpy (obuf, &tmp, sizeof tmp);
! 90: }
! 91:
! 92: void putUShort (obuf, val)
! 93: unsigned char *obuf;
! 94: u_int32_t val;
! 95: {
! 96: u_int16_t tmp = htons (val);
! 97: memcpy (obuf, &tmp, sizeof tmp);
! 98: }
! 99:
! 100: void putShort (obuf, val)
! 101: unsigned char *obuf;
! 102: int32_t val;
! 103: {
! 104: int16_t tmp = htons (val);
! 105: memcpy (obuf, &tmp, sizeof tmp);
! 106: }
! 107:
! 108: void putUChar (obuf, val)
! 109: unsigned char *obuf;
! 110: u_int32_t val;
! 111: {
! 112: *obuf = val;
! 113: }
! 114:
! 115: u_int32_t getUChar (obuf)
! 116: const unsigned char *obuf;
! 117: {
! 118: return obuf [0];
! 119: }
! 120:
! 121: int converted_length (buf, base, width)
! 122: const unsigned char *buf;
! 123: unsigned int base;
! 124: unsigned int width;
! 125: {
! 126: u_int32_t number;
! 127: u_int32_t column;
! 128: int power = 1;
! 129: u_int32_t newcolumn = base;
! 130:
! 131: if (base > 16)
! 132: return 0;
! 133:
! 134: if (width == 1)
! 135: number = getUChar (buf);
! 136: else if (width == 2)
! 137: number = getUShort (buf);
! 138: else if (width == 4)
! 139: number = getULong (buf);
! 140: else
! 141: return 0;
! 142:
! 143: do {
! 144: column = newcolumn;
! 145:
! 146: if (number < column)
! 147: return power;
! 148: power++;
! 149: newcolumn = column * base;
! 150: /* If we wrap around, it must be the next power of two up. */
! 151: } while (newcolumn > column);
! 152:
! 153: return power;
! 154: }
! 155:
! 156: int binary_to_ascii (outbuf, inbuf, base, width)
! 157: unsigned char *outbuf;
! 158: const unsigned char *inbuf;
! 159: unsigned int base;
! 160: unsigned int width;
! 161: {
! 162: u_int32_t number;
! 163: static char h2a [] = "0123456789abcdef";
! 164: int power = converted_length (inbuf, base, width);
! 165: int i;
! 166:
! 167: if (base > 16)
! 168: return 0;
! 169:
! 170: if (width == 1)
! 171: number = getUChar (inbuf);
! 172: else if (width == 2)
! 173: number = getUShort (inbuf);
! 174: else if (width == 4)
! 175: number = getULong (inbuf);
! 176: else
! 177: return 0;
! 178:
! 179: for (i = power - 1 ; i >= 0; i--) {
! 180: outbuf [i] = h2a [number % base];
! 181: number /= base;
! 182: }
! 183:
! 184: return power;
! 185: }
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