1/* -*- Mode: C; tab-width: 4 -*-
2 *
3 * Copyright (c) 2003-2011 Apple 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 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