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/*
* filetype.c - detect filetypes
*
* Copyright (c) 2011 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation.
*
* 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.
*/
#include <common.h>
#include <filetype.h>
#include <asm/byteorder.h>
#include <asm/unaligned.h>
#include <fcntl.h>
#include <fs.h>
#include <malloc.h>
#include <errno.h>
static const char *filetype_str[] = {
[filetype_unknown] = "unknown",
[filetype_arm_zimage] = "arm Linux zImage",
[filetype_lzo_compressed] = "lzo compressed",
[filetype_arm_barebox] = "arm barebox image",
[filetype_uimage] = "U-Boot uImage",
[filetype_ubi] = "UBI image",
[filetype_jffs2] = "JFFS2 image",
[filetype_gzip] = "gzip compressed",
[filetype_bzip2] = "bzip2 compressed",
[filetype_oftree] = "open firmware flat device tree",
[filetype_aimage] = "Android boot image",
[filetype_sh] = "Bourne Shell",
[filetype_mips_barebox] = "MIPS barebox image",
[filetype_fat] = "FAT filesytem",
[filetype_mbr] = "MBR sector",
[filetype_bmp] = "BMP image",
[filetype_png] = "PNG image",
};
const char *file_type_to_string(enum filetype f)
{
if (f < ARRAY_SIZE(filetype_str))
return filetype_str[f];
return NULL;
}
#define MBR_StartSector 8 /* MBR: Offset of Starting Sector in Partition Table Entry */
#define BS_55AA 510 /* Boot sector signature (2) */
#define MBR_Table 446 /* MBR: Partition table offset (2) */
#define BS_FilSysType32 82 /* File system type (1) */
#define BS_FilSysType 54 /* File system type (1) */
enum filetype is_fat_or_mbr(const unsigned char *sector, unsigned long *bootsec)
{
/*
* bootsec can be used to return index of the first sector in the
* first partition
*/
if (bootsec)
*bootsec = 0;
/*
* Check record signature (always placed at offset 510 even if the
* sector size is > 512)
*/
if (get_unaligned_le16(§or[BS_55AA]) != 0xAA55)
return filetype_unknown;
/* Check "FAT" string */
if ((get_unaligned_le32(§or[BS_FilSysType]) & 0xFFFFFF) == 0x544146)
return filetype_fat;
if ((get_unaligned_le32(§or[BS_FilSysType32]) & 0xFFFFFF) == 0x544146)
return filetype_fat;
if (bootsec)
/*
* This must be an MBR, so return the starting sector of the
* first partition so we could check if there is a FAT boot
* sector there
*/
*bootsec = get_unaligned_le16(§or[MBR_Table + MBR_StartSector]);
return filetype_mbr;
}
enum filetype file_detect_type(void *_buf)
{
u32 *buf = _buf;
u64 *buf64 = _buf;
u8 *buf8 = _buf;
enum filetype type;
if (strncmp(buf8, "#!/bin/sh", 9) == 0)
return filetype_sh;
if (is_barebox_arm_head(_buf))
return filetype_arm_barebox;
if (buf[9] == 0x016f2818 || buf[9] == 0x18286f01)
return filetype_arm_zimage;
if (buf8[0] == 0x89 && buf8[1] == 0x4c && buf8[2] == 0x5a &&
buf8[3] == 0x4f)
return filetype_lzo_compressed;
if (buf[0] == be32_to_cpu(0x27051956))
return filetype_uimage;
if (buf[0] == 0x23494255)
return filetype_ubi;
if (buf[0] == 0x20031985)
return filetype_jffs2;
if (buf8[0] == 0x1f && buf8[1] == 0x8b && buf8[2] == 0x08)
return filetype_gzip;
if (buf8[0] == 'B' && buf8[1] == 'Z' && buf8[2] == 'h' &&
buf8[3] > '0' && buf8[3] <= '9')
return filetype_bzip2;
if (buf[0] == be32_to_cpu(0xd00dfeed))
return filetype_oftree;
if (strncmp(buf8, "ANDROID!", 8) == 0)
return filetype_aimage;
if (strncmp(buf8 + 0x10, "barebox", 7) == 0)
return filetype_mips_barebox;
type = is_fat_or_mbr(buf8, NULL);
if (type != filetype_unknown)
return type;
if (strncmp(buf8, "BM", 2) == 0)
return filetype_bmp;
if (buf64[0] == le64_to_cpu(0x0a1a0a0d474e5089ull))
return filetype_png;
return filetype_unknown;
}
enum filetype file_name_detect_type(const char *filename)
{
int fd, ret;
void *buf;
enum filetype type = filetype_unknown;
unsigned long bootsec;
fd = open(filename, O_RDONLY);
if (fd < 0)
return fd;
buf = xzalloc(512);
ret = read(fd, buf, 512);
if (ret < 0)
goto err_out;
type = file_detect_type(buf);
if (type == filetype_mbr) {
/*
* Get the first partition start sector
* and check for FAT in it
*/
is_fat_or_mbr(buf, &bootsec);
ret = lseek(fd, (bootsec) * 512, SEEK_SET);
if (ret < 0)
goto err_out;
ret = read(fd, buf, 512);
if (ret < 0)
goto err_out;
type = is_fat_or_mbr((u8 *)buf, NULL);
}
err_out:
close(fd);
free(buf);
return type;
}
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