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
37struct 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
49int 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