| 1 | /* |
| 2 | * Copyright (C) 2011 Gabor Juhos <juhosg@openwrt.org> |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify it |
| 5 | * under the terms of the GNU General Public License version 2 as published |
| 6 | * by the Free Software Foundation. |
| 7 | * |
| 8 | */ |
| 9 | |
| 10 | #include <errno.h> |
| 11 | #include <fcntl.h> |
| 12 | #include <libgen.h> |
| 13 | #include <stdio.h> |
| 14 | #include <stdint.h> |
| 15 | #include <stdlib.h> |
| 16 | #include <string.h> |
| 17 | #include <unistd.h> |
| 18 | #include <sys/types.h> |
| 19 | #include <sys/stat.h> |
| 20 | |
| 21 | static char *progname; |
| 22 | static unsigned char eof_mark[4] = {0xde, 0xad, 0xc0, 0xde}; |
| 23 | |
| 24 | #define ERR(fmt, ...) do { \ |
| 25 | fflush(0); \ |
| 26 | fprintf(stderr, "[%s] *** error: " fmt "\n", \ |
| 27 | progname, ## __VA_ARGS__ ); \ |
| 28 | } while (0) |
| 29 | |
| 30 | #define ERRS(fmt, ...) do { \ |
| 31 | int save = errno; \ |
| 32 | fflush(0); \ |
| 33 | fprintf(stderr, "[%s] *** error: " fmt ", %s\n", \ |
| 34 | progname, ## __VA_ARGS__, strerror(save)); \ |
| 35 | } while (0) |
| 36 | |
| 37 | #define BUF_SIZE (64 * 1024) |
| 38 | #define ALIGN(_x,_y) (((_x) + ((_y) - 1)) & ~((_y) - 1)) |
| 39 | |
| 40 | static int pad_image(char *name, uint32_t pad_mask) |
| 41 | { |
| 42 | char *buf; |
| 43 | int fd; |
| 44 | ssize_t in_len; |
| 45 | ssize_t out_len; |
| 46 | int ret = -1; |
| 47 | |
| 48 | buf = malloc(BUF_SIZE); |
| 49 | if (!buf) { |
| 50 | ERR("No memory for buffer"); |
| 51 | goto out; |
| 52 | } |
| 53 | |
| 54 | fd = open(name, O_RDWR); |
| 55 | if (fd < 0) { |
| 56 | ERRS("Unable to open %s", name); |
| 57 | goto free_buf; |
| 58 | } |
| 59 | |
| 60 | in_len = lseek(fd, 0, SEEK_END); |
| 61 | if (in_len < 0) |
| 62 | goto close; |
| 63 | |
| 64 | memset(buf, '\xff', BUF_SIZE); |
| 65 | |
| 66 | out_len = in_len; |
| 67 | while (pad_mask) { |
| 68 | uint32_t mask; |
| 69 | ssize_t t; |
| 70 | int i; |
| 71 | |
| 72 | for (i = 10; i < 32; i++) { |
| 73 | mask = 1UL << i; |
| 74 | if (pad_mask & mask) |
| 75 | break; |
| 76 | } |
| 77 | |
| 78 | in_len = ALIGN(in_len, mask); |
| 79 | |
| 80 | for (i = 10; i < 32; i++) { |
| 81 | mask = 1UL << i; |
| 82 | if ((in_len & (mask - 1)) == 0) |
| 83 | pad_mask &= ~mask; |
| 84 | } |
| 85 | |
| 86 | printf("padding image to %08x\n", (unsigned int) in_len); |
| 87 | |
| 88 | while (out_len < in_len) { |
| 89 | ssize_t len; |
| 90 | |
| 91 | len = in_len - out_len; |
| 92 | if (len > BUF_SIZE) |
| 93 | len = BUF_SIZE; |
| 94 | |
| 95 | t = write(fd, buf, len); |
| 96 | if (t != len) { |
| 97 | ERRS("Unable to write to %s", name); |
| 98 | goto close; |
| 99 | } |
| 100 | |
| 101 | out_len += len; |
| 102 | } |
| 103 | |
| 104 | /* write out the JFFS end-of-filesystem marker */ |
| 105 | t = write(fd, eof_mark, 4); |
| 106 | if (t != 4) { |
| 107 | ERRS("Unable to write to %s", name); |
| 108 | goto close; |
| 109 | } |
| 110 | out_len += 4; |
| 111 | } |
| 112 | |
| 113 | ret = 0; |
| 114 | |
| 115 | close: |
| 116 | close(fd); |
| 117 | free_buf: |
| 118 | free(buf); |
| 119 | out: |
| 120 | return ret; |
| 121 | } |
| 122 | |
| 123 | int main(int argc, char* argv[]) |
| 124 | { |
| 125 | uint32_t pad_mask; |
| 126 | int ret = EXIT_FAILURE; |
| 127 | int err; |
| 128 | int i; |
| 129 | |
| 130 | progname = basename(argv[0]); |
| 131 | |
| 132 | if (argc < 2) { |
| 133 | fprintf(stderr, |
| 134 | "Usage: %s file [pad0] [pad1] [padN]\n", |
| 135 | progname); |
| 136 | goto out; |
| 137 | } |
| 138 | |
| 139 | pad_mask = 0; |
| 140 | for (i = 2; i < argc; i++) |
| 141 | pad_mask |= strtoul(argv[i], NULL, 0) * 1024; |
| 142 | |
| 143 | if (pad_mask == 0) |
| 144 | pad_mask = (4 * 1024) | (8 * 1024) | (64 * 1024) | |
| 145 | (128 * 1024); |
| 146 | |
| 147 | err = pad_image(argv[1], pad_mask); |
| 148 | if (err) |
| 149 | goto out; |
| 150 | |
| 151 | ret = EXIT_SUCCESS; |
| 152 | |
| 153 | out: |
| 154 | return ret; |
| 155 | } |
| 156 | |
