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23e7e3ae JVH |
1 | /** |
2 | * Copyright (C) 2011-2012 Juho Vähä-Herttua | |
3 | * | |
4 | * This library is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU Lesser General Public | |
6 | * License as published by the Free Software Foundation; either | |
7 | * version 2.1 of the License, or (at your option) any later version. | |
8 | * | |
9 | * This library is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
12 | * Lesser General Public License for more details. | |
13 | */ | |
14 | ||
2340bcd3 JVH |
15 | #include <stdlib.h> |
16 | #include <stdio.h> | |
17 | #include <string.h> | |
18 | ||
19 | char * | |
20 | utils_strsep(char **stringp, const char *delim) | |
21 | { | |
22 | char *original; | |
23 | char *strptr; | |
24 | ||
25 | if (*stringp == NULL) { | |
26 | return NULL; | |
27 | } | |
28 | ||
29 | original = *stringp; | |
30 | strptr = strstr(*stringp, delim); | |
31 | if (strptr == NULL) { | |
32 | *stringp = NULL; | |
33 | return original; | |
34 | } | |
35 | *strptr = '\0'; | |
36 | *stringp = strptr+strlen(delim); | |
37 | return original; | |
38 | } | |
39 | ||
40 | int | |
41 | utils_read_file(char **dst, const char *filename) | |
42 | { | |
43 | FILE *stream; | |
44 | int filesize; | |
45 | char *buffer; | |
46 | int read_bytes; | |
47 | ||
48 | /* Open stream for reading */ | |
49 | stream = fopen(filename, "rb"); | |
50 | if (!stream) { | |
51 | return -1; | |
52 | } | |
53 | ||
54 | /* Find out file size */ | |
55 | fseek(stream, 0, SEEK_END); | |
56 | filesize = ftell(stream); | |
57 | fseek(stream, 0, SEEK_SET); | |
58 | ||
59 | /* Allocate one extra byte for zero */ | |
60 | buffer = malloc(filesize+1); | |
61 | if (!buffer) { | |
62 | fclose(stream); | |
63 | return -2; | |
64 | } | |
65 | ||
66 | /* Read data in a loop to buffer */ | |
67 | read_bytes = 0; | |
68 | do { | |
69 | int ret = fread(buffer+read_bytes, 1, | |
70 | filesize-read_bytes, stream); | |
71 | if (ret == 0) { | |
72 | break; | |
73 | } | |
74 | read_bytes += ret; | |
75 | } while (read_bytes < filesize); | |
76 | ||
77 | /* Add final null byte and close stream */ | |
78 | buffer[read_bytes] = '\0'; | |
79 | fclose(stream); | |
80 | ||
81 | /* If read didn't finish, return error */ | |
82 | if (read_bytes != filesize) { | |
83 | free(buffer); | |
84 | return -3; | |
85 | } | |
86 | ||
87 | /* Return buffer */ | |
88 | *dst = buffer; | |
89 | return filesize; | |
90 | } | |
91 | ||
92 | int | |
93 | utils_hwaddr_raop(char *str, int strlen, const char *hwaddr, int hwaddrlen) | |
94 | { | |
95 | int i,j; | |
96 | ||
97 | /* Check that our string is long enough */ | |
98 | if (strlen == 0 || strlen < 2*hwaddrlen+1) | |
99 | return -1; | |
100 | ||
101 | /* Convert hardware address to hex string */ | |
102 | for (i=0,j=0; i<hwaddrlen; i++) { | |
103 | int hi = (hwaddr[i]>>4) & 0x0f; | |
104 | int lo = hwaddr[i] & 0x0f; | |
105 | ||
106 | if (hi < 10) str[j++] = '0' + hi; | |
107 | else str[j++] = 'A' + hi-10; | |
108 | if (lo < 10) str[j++] = '0' + lo; | |
109 | else str[j++] = 'A' + lo-10; | |
110 | } | |
111 | ||
112 | /* Add string terminator */ | |
113 | str[j++] = '\0'; | |
114 | return j; | |
115 | } | |
116 | ||
117 | int | |
118 | utils_hwaddr_airplay(char *str, int strlen, const char *hwaddr, int hwaddrlen) | |
119 | { | |
120 | int i,j; | |
121 | ||
122 | /* Check that our string is long enough */ | |
123 | if (strlen == 0 || strlen < 2*hwaddrlen+hwaddrlen) | |
124 | return -1; | |
125 | ||
126 | /* Convert hardware address to hex string */ | |
127 | for (i=0,j=0; i<hwaddrlen; i++) { | |
128 | int hi = (hwaddr[i]>>4) & 0x0f; | |
129 | int lo = hwaddr[i] & 0x0f; | |
130 | ||
131 | if (hi < 10) str[j++] = '0' + hi; | |
132 | else str[j++] = 'a' + hi-10; | |
133 | if (lo < 10) str[j++] = '0' + lo; | |
134 | else str[j++] = 'a' + lo-10; | |
135 | ||
136 | str[j++] = ':'; | |
137 | } | |
138 | ||
139 | /* Add string terminator */ | |
140 | if (j != 0) j--; | |
141 | str[j++] = '\0'; | |
142 | return j; | |
143 | } | |
144 |