1/* -*- Mode: C; tab-width: 4 -*-
2 *
3 * Copyright (c) 2003-2004, Apple Computer, Inc. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 *
8 * 1.  Redistributions of source code must retain the above copyright notice,
9 *     this list of conditions and the following disclaimer.
10 * 2.  Redistributions in binary form must reproduce the above copyright notice,
11 *     this list of conditions and the following disclaimer in the documentation
12 *     and/or other materials provided with the distribution.
13 * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of its
14 *     contributors may be used to endorse or promote products derived from this
15 *     software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
18 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
20 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
21 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
23 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
26 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29#include "dnssd_ipc.h"
30
31#if defined(_WIN32)
32
33char *win32_strerror(int inErrorCode)
34	{
35	static char buffer[1024];
36	DWORD       n;
37	memset(buffer, 0, sizeof(buffer));
38	n = FormatMessageA(
39			FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
40			NULL,
41			(DWORD) inErrorCode,
42			MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
43			buffer,
44			sizeof(buffer),
45			NULL);
46	if (n > 0)
47		{
48		// Remove any trailing CR's or LF's since some messages have them.
49		while ((n > 0) && isspace(((unsigned char *) buffer)[n - 1]))
50			buffer[--n] = '\0';
51		}
52	return buffer;
53	}
54
55#endif
56
57void put_uint32(const uint32_t l, char **ptr)
58	{
59	(*ptr)[0] = (char)((l >> 24) &  0xFF);
60	(*ptr)[1] = (char)((l >> 16) &  0xFF);
61	(*ptr)[2] = (char)((l >>  8) &  0xFF);
62	(*ptr)[3] = (char)((l      ) &  0xFF);
63	*ptr += sizeof(uint32_t);
64	}
65
66uint32_t get_uint32(const char **ptr, const char *end)
67	{
68	if (!*ptr || *ptr + sizeof(uint32_t) > end)
69		{
70		*ptr = NULL;
71		return(0);
72		}
73	else
74		{
75		uint8_t *p = (uint8_t*) *ptr;
76		*ptr += sizeof(uint32_t);
77		return((uint32_t) ((uint32_t)p[0] << 24 | (uint32_t)p[1] << 16 | (uint32_t)p[2] << 8 | p[3]));
78		}
79	}
80
81void put_uint16(uint16_t s, char **ptr)
82	{
83	(*ptr)[0] = (char)((s >>  8) &  0xFF);
84	(*ptr)[1] = (char)((s      ) &  0xFF);
85	*ptr += sizeof(uint16_t);
86	}
87
88uint16_t get_uint16(const char **ptr, const char *end)
89	{
90	if (!*ptr || *ptr + sizeof(uint16_t) > end)
91		{
92		*ptr = NULL;
93		return(0);
94		}
95	else
96		{
97		uint8_t *p = (uint8_t*) *ptr;
98		*ptr += sizeof(uint16_t);
99		return((uint16_t) ((uint16_t)p[0] << 8 | p[1]));
100		}
101	}
102
103int put_string(const char *str, char **ptr)
104	{
105	if (!str) str = "";
106	strcpy(*ptr, str);
107	*ptr += strlen(str) + 1;
108	return 0;
109	}
110
111int get_string(const char **ptr, const char *const end, char *buffer, int buflen)
112	{
113	if (!*ptr)
114		{
115		*buffer = 0;
116		return(-1);
117		}
118	else
119		{
120		char *lim = buffer + buflen;	// Calculate limit
121		while (*ptr < end && buffer < lim)
122			{
123			char c = *buffer++ = *(*ptr)++;
124			if (c == 0) return(0);		// Success
125			}
126		if (buffer == lim) buffer--;
127		*buffer = 0;					// Failed, so terminate string,
128		*ptr = NULL;					// clear pointer,
129		return(-1);						// and return failure indication
130		}
131	}
132
133void put_rdata(const int rdlen, const unsigned char *rdata, char **ptr)
134	{
135	memcpy(*ptr, rdata, rdlen);
136	*ptr += rdlen;
137	}
138
139const char *get_rdata(const char **ptr, const char *end, int rdlen)
140	{
141	if (!*ptr || *ptr + rdlen > end)
142		{
143		*ptr = NULL;
144		return(0);
145		}
146	else
147		{
148		const char *rd = *ptr;
149		*ptr += rdlen;
150		return rd;
151		}
152	}
153
154void ConvertHeaderBytes(ipc_msg_hdr *hdr)
155	{
156	hdr->version   = htonl(hdr->version);
157	hdr->datalen   = htonl(hdr->datalen);
158	hdr->ipc_flags = htonl(hdr->ipc_flags);
159	hdr->op        = htonl(hdr->op );
160	hdr->reg_index = htonl(hdr->reg_index);
161	}
162