Ronald G. Minnich | 5d01ec0 | 2009-03-31 11:57:36 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * romtool |
| 3 | * |
| 4 | * Copyright (C) 2008 Jordan Crouse <jordan@cosmicpenguin.net> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; version 2 of the License. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License |
| 16 | * along with this program; if not, write to the Free Software |
| 17 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA, 02110-1301 USA |
| 18 | */ |
| 19 | |
| 20 | #include <stdio.h> |
| 21 | #include "elf.h" |
| 22 | #include <stdlib.h> |
| 23 | #include <string.h> |
| 24 | #include <unistd.h> |
| 25 | #include <fcntl.h> |
| 26 | #include <sys/stat.h> |
| 27 | |
| 28 | #include "common.h" |
| 29 | |
| 30 | #define BLOCKSIZE (1024 * 16) |
| 31 | |
| 32 | void file_write_from_buffer(int fd, unsigned char *buffer, int size) |
| 33 | { |
| 34 | unsigned char *ptr = buffer; |
| 35 | |
| 36 | while (size) { |
| 37 | int ret = write(fd, ptr, size); |
| 38 | |
| 39 | if (ret == -1) |
| 40 | break; |
| 41 | |
| 42 | size -= ret; |
| 43 | ptr += ret; |
| 44 | } |
| 45 | } |
| 46 | |
| 47 | unsigned char *file_read_to_buffer(int fd, int *fsize) |
| 48 | { |
| 49 | unsigned char *buffer = malloc(BLOCKSIZE); |
| 50 | unsigned char *ptr = buffer; |
| 51 | |
| 52 | int bsize = BLOCKSIZE; |
| 53 | int remain = BLOCKSIZE; |
| 54 | int size = 0; |
| 55 | int ret; |
| 56 | |
| 57 | if (buffer == NULL) |
| 58 | return NULL; |
| 59 | |
| 60 | while (1) { |
| 61 | ret = read(fd, ptr, remain); |
| 62 | |
| 63 | if (ret <= 0) |
| 64 | break; |
| 65 | |
| 66 | remain -= ret; |
| 67 | ptr += ret; |
| 68 | size += ret; |
| 69 | |
| 70 | /* Allocate more memory */ |
| 71 | |
| 72 | if (remain == 0) { |
| 73 | buffer = realloc(buffer, bsize + BLOCKSIZE); |
| 74 | |
| 75 | if (buffer == NULL) |
| 76 | return NULL; |
| 77 | |
| 78 | ptr = buffer + size; |
| 79 | |
| 80 | bsize += BLOCKSIZE; |
| 81 | remain = BLOCKSIZE; |
| 82 | } |
| 83 | } |
| 84 | |
| 85 | if (ret == 0) { |
| 86 | *fsize = size; |
| 87 | return buffer; |
| 88 | } |
| 89 | |
| 90 | *fsize = 0; |
| 91 | free(buffer); |
| 92 | return NULL; |
| 93 | } |
| 94 | |
| 95 | unsigned char *file_read(const char *filename, int *fsize) |
| 96 | { |
| 97 | int fd = open(filename, O_RDONLY); |
| 98 | unsigned char *buffer; |
| 99 | |
| 100 | if (fd == -1) |
| 101 | return NULL; |
| 102 | |
| 103 | buffer = file_read_to_buffer(fd, fsize); |
| 104 | close(fd); |
| 105 | return buffer; |
| 106 | } |
| 107 | |
| 108 | void file_write(const char *filename, unsigned char *buffer, int size) |
| 109 | { |
| 110 | int fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, |
| 111 | S_IRUSR | S_IWUSR); |
| 112 | |
| 113 | if (fd == -1) { |
| 114 | fprintf(stderr, "E: Could not create %s: %m\n", filename); |
| 115 | return; |
| 116 | } |
| 117 | |
| 118 | file_write_from_buffer(fd, buffer, size); |
| 119 | close(fd); |
| 120 | } |
| 121 | |
| 122 | int iself(unsigned char *input) |
| 123 | { |
| 124 | Elf32_Ehdr *ehdr = (Elf32_Ehdr *) input; |
| 125 | return !memcmp(ehdr->e_ident, ELFMAG, 4); |
| 126 | } |