1 /*
2 * media.c -
3 *
4 * Written by Eryk Vershen
5 */
6
7 /*
8 * Copyright 1997,1998 by Apple Computer, Inc.
9 * All Rights Reserved
10 *
11 * Permission to use, copy, modify, and distribute this software and
12 * its documentation for any purpose and without fee is hereby granted,
13 * provided that the above copyright notice appears in all copies and
14 * that both the copyright notice and this permission notice appear in
15 * supporting documentation.
16 *
17 * APPLE COMPUTER DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE
18 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
19 * FOR A PARTICULAR PURPOSE.
20 *
21 * IN NO EVENT SHALL APPLE COMPUTER BE LIABLE FOR ANY SPECIAL, INDIRECT, OR
22 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
23 * LOSS OF USE, DATA OR PROFITS, WHETHER IN ACTION OF CONTRACT,
24 * NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
25 * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
26 */
27
28
29 // for printf()
30 #include <stdio.h>
31 // for malloc() & free()
32 #include <stdlib.h>
33
34 #include "media.h"
35
36
37 /*
38 * Defines
39 */
40
41
42 /*
43 * Types
44 */
45
46
47 /*
48 * Global Constants
49 */
50
51
52 /*
53 * Global Variables
54 */
55 static long media_kind = 0;
56
57 /*
58 * Forward declarations
59 */
60
61
62 /*
63 * Routines
64 */
65 long
allocate_media_kind(void)66 allocate_media_kind(void)
67 {
68 media_kind++;
69 return media_kind;
70 }
71
72
73 MEDIA
new_media(long size)74 new_media(long size)
75 {
76 return (MEDIA) malloc(size);
77 }
78
79
80 void
delete_media(MEDIA m)81 delete_media(MEDIA m)
82 {
83 if (m == 0) {
84 return;
85 }
86 free(m);
87 }
88
89
90 uint32_t
media_granularity(MEDIA m)91 media_granularity(MEDIA m)
92 {
93 if (m == 0) {
94 return 0;
95 } else {
96 return m->grain;
97 }
98 }
99
100
101 long long
media_total_size(MEDIA m)102 media_total_size(MEDIA m)
103 {
104 if (m == 0) {
105 return 0;
106 } else {
107 return m->size_in_bytes;
108 }
109 }
110
111
112 long
read_media(MEDIA m,long long offset,uint32_t count,void * address)113 read_media(MEDIA m, long long offset, uint32_t count, void *address)
114 {
115 long result;
116
117 if (m != 0 && m->do_read != 0) {
118 //printf("media: read type %d, offset %Ld, count %d\n\t", m->kind, offset, count);
119 result = (*m->do_read)(m, offset, count, address);
120 //printf(" - returns %d\n", result);
121 return result;
122 } else {
123 return 0;
124 }
125 }
126
127
128 long
write_media(MEDIA m,long long offset,uint32_t count,void * address)129 write_media(MEDIA m, long long offset, uint32_t count, void *address)
130 {
131 long result;
132
133 if (m != 0 && m->do_write != 0) {
134 //printf("media: write type %d, offset %Ld, count %d\n\t", m->kind, offset, count);
135 result = (*m->do_write)(m, offset, count, address);
136 //printf(" - returns %d\n", result);
137 return result;
138 } else {
139 return 0;
140 }
141 }
142
143
144 void
close_media(MEDIA m)145 close_media(MEDIA m)
146 {
147 if (m == 0) {
148 return;
149 }
150 if (m->kind != 0) {
151 if (m->do_close != 0) {
152 (*m->do_close)(m);
153 }
154 m->kind = 0;
155 delete_media(m);
156 }
157 }
158
159
160 void
os_reload_media(MEDIA m)161 os_reload_media(MEDIA m)
162 {
163 if (m != 0 && m->do_os_reload != 0) {
164 (*m->do_os_reload)(m);
165 }
166 }
167
168
169 #if !defined(__linux__) && !defined(__unix__)
170 #pragma mark -
171 #endif
172
173
174
175 MEDIA_ITERATOR
new_media_iterator(long size)176 new_media_iterator(long size)
177 {
178 return (MEDIA_ITERATOR) malloc(size);
179 }
180
181
182 void
private_delete_media_iterator(MEDIA_ITERATOR m)183 private_delete_media_iterator(MEDIA_ITERATOR m)
184 {
185 if (m == 0) {
186 return;
187 }
188 free(m);
189 }
190
191
192 void
reset_media_iterator(MEDIA_ITERATOR m)193 reset_media_iterator(MEDIA_ITERATOR m)
194 {
195 if (m != 0 && m->do_reset != 0) {
196 (*m->do_reset)(m);
197 }
198 }
199
200
201 char *
step_media_iterator(MEDIA_ITERATOR m)202 step_media_iterator(MEDIA_ITERATOR m)
203 {
204 char *result;
205
206 if (m != 0 && m->do_step != 0) {
207 result = (*m->do_step)(m);
208 } else {
209 result = 0;
210 }
211 return result;
212 }
213
214
215 void
delete_media_iterator(MEDIA_ITERATOR m)216 delete_media_iterator(MEDIA_ITERATOR m)
217 {
218 if (m == 0) {
219 return;
220 }
221 if (m->kind != 0) {
222 if (m->do_delete != 0) {
223 (*m->do_delete)(m);
224 }
225 m->kind = 0;
226 private_delete_media_iterator(m);
227 }
228 }
229