1 /* ----------------------------------------------------------------------- *
2 *
3 * Copyright 2007-2008 H. Peter Anvin - All Rights Reserved
4 *
5 * Permission is hereby granted, free of charge, to any person
6 * obtaining a copy of this software and associated documentation
7 * files (the "Software"), to deal in the Software without
8 * restriction, including without limitation the rights to use,
9 * copy, modify, merge, publish, distribute, sublicense, and/or
10 * sell copies of the Software, and to permit persons to whom
11 * the Software is furnished to do so, subject to the following
12 * conditions:
13 *
14 * The above copyright notice and this permission notice shall
15 * be included in all copies or substantial portions of the Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
18 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
19 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
20 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
21 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
22 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
23 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
24 * OTHER DEALINGS IN THE SOFTWARE.
25 *
26 * ----------------------------------------------------------------------- */
27
28 /*
29 * initramfs.c
30 *
31 * Utility functions for initramfs manipulation
32 */
33
34 #include <stdlib.h>
35 #include <syslinux/linux.h>
36
initramfs_init(void)37 struct initramfs *initramfs_init(void)
38 {
39 struct initramfs *ir;
40
41 ir = calloc(sizeof(*ir), 1);
42 if (!ir)
43 return NULL;
44
45 ir->prev = ir->next = ir;
46 return ir;
47 }
48
initramfs_add_data(struct initramfs * ihead,const void * data,size_t data_len,size_t len,size_t align)49 int initramfs_add_data(struct initramfs *ihead, const void *data,
50 size_t data_len, size_t len, size_t align)
51 {
52 struct initramfs *in;
53
54 if (!len)
55 return 0; /* Nothing to add... */
56
57 /* Alignment must be a power of 2, and <= INITRAMFS_MAX_ALIGN */
58 if (!align || (align & (align - 1)) || align > INITRAMFS_MAX_ALIGN)
59 return -1;
60
61 in = malloc(sizeof(*in));
62 if (!in)
63 return -1;
64
65 in->len = len;
66 in->data = data;
67 in->data_len = data_len;
68 in->align = align;
69
70 in->next = ihead;
71 in->prev = ihead->prev;
72 ihead->prev->next = in;
73 ihead->prev = in;
74
75 return 0;
76 }
77