| 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 | |
| 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 | |