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/*
* cbfstool
*
* Copyright (C) 2008 Jordan Crouse <jordan@cosmicpenguin.net>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA, 02110-1301 USA
*/
#include <stdio.h>
#include "elf.h"
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/stat.h>
#include "common.h"
#define BLOCKSIZE (1024 * 16)
void file_write_from_buffer(int fd, unsigned char *buffer, int size)
{
unsigned char *ptr = buffer;
while (size) {
int ret = write(fd, ptr, size);
if (ret == -1)
break;
size -= ret;
ptr += ret;
}
}
unsigned char *file_read_to_buffer(int fd, int *fsize)
{
unsigned char *buffer = malloc(BLOCKSIZE);
unsigned char *ptr = buffer;
int bsize = BLOCKSIZE;
int remain = BLOCKSIZE;
int size = 0;
int ret;
if (buffer == NULL)
return NULL;
while (1) {
ret = read(fd, ptr, remain);
if (ret <= 0)
break;
remain -= ret;
ptr += ret;
size += ret;
/* Allocate more memory */
if (remain == 0) {
buffer = realloc(buffer, bsize + BLOCKSIZE);
if (buffer == NULL)
return NULL;
ptr = buffer + size;
bsize += BLOCKSIZE;
remain = BLOCKSIZE;
}
}
if (ret == 0) {
*fsize = size;
return buffer;
}
*fsize = 0;
free(buffer);
return NULL;
}
unsigned char *file_read(const char *filename, int *fsize)
{
int fd = open(filename, O_RDONLY);
unsigned char *buffer;
if (fd == -1)
return NULL;
buffer = file_read_to_buffer(fd, fsize);
close(fd);
return buffer;
}
void file_write(const char *filename, unsigned char *buffer, int size)
{
int fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC,
S_IRUSR | S_IWUSR);
if (fd == -1) {
fprintf(stderr, "E: Could not create %s: %m\n", filename);
return;
}
file_write_from_buffer(fd, buffer, size);
close(fd);
}
int iself(unsigned char *input)
{
Elf32_Ehdr *ehdr = (Elf32_Ehdr *) input;
return !memcmp(ehdr->e_ident, ELFMAG, 4);
}
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