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 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 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
