b9c8454adf
dereference or worse) in case the archive length is exactly sizeof(struct lar_header). Such an archive is invalid because the filename directly after the LAR header is always dereferenced and has to be at least 1 byte in the "empty filename" case (only terminating \0). Improve LAR code documentation and reorder variables in one assignment to make the code more obvious and readable. This will help people understand what the code does when they look at it half a year from now. Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net> Acked-by: Uwe Hermann <uwe@hermann-uwe.de> git-svn-id: svn://coreboot.org/repository/LinuxBIOSv3@506 f3766cd6-281f-0410-b1cd-43a5c92072e9
125 lines
4.5 KiB
C
125 lines
4.5 KiB
C
/*
|
|
* lar - LinuxBIOS archiver
|
|
*
|
|
* Copyright (C) 2006 coresystems GmbH
|
|
* (Written by Stefan Reinauer <stepan@coresystems.de> for coresystems GmbH)
|
|
* Copyright (C) 2007 Patrick Georgi <patrick@georgi-clan.de>
|
|
*
|
|
* This file is dual-licensed. You can choose between:
|
|
* - The GNU GPL, version 2, as published by the Free Software Foundation
|
|
* - The revised BSD license (without advertising clause)
|
|
*
|
|
* ---------------------------------------------------------------------------
|
|
* 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
|
|
* ---------------------------------------------------------------------------
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. The name of the author may not be used to endorse or promote products
|
|
* derived from this software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
* ---------------------------------------------------------------------------
|
|
*/
|
|
|
|
#include <stdint.h>
|
|
|
|
#define MAGIC "LARCHIVE"
|
|
#define MAX_PATHLEN 1024
|
|
#define BOOTBLOCK_SIZE 16384
|
|
|
|
#define BOOTBLOCK_NAME "bootblock"
|
|
#define BOOTBLOCK_NAME_LEN 16
|
|
|
|
typedef uint64_t u64;
|
|
typedef uint32_t u32;
|
|
typedef uint8_t u8;
|
|
|
|
/* NOTE -- This and the user-mode lar.h may NOT be in sync. Be careful. */
|
|
struct lar_header {
|
|
char magic[8];
|
|
u32 len;
|
|
u32 reallen;
|
|
u32 checksum;
|
|
u32 compchecksum;
|
|
/* Filenames are limited to 2^31-1-sizeof(lar_header)-1 bytes.
|
|
* "Nobody will ever need more than 640k" */
|
|
u32 offset;
|
|
/* Compression:
|
|
* 0 = no compression
|
|
* 1 = lzma
|
|
* 2 = nrv2b
|
|
*/
|
|
u32 compression;
|
|
u64 entry;
|
|
u64 loadaddress;
|
|
};
|
|
|
|
/**\struct
|
|
* A structure containing information about a currently open and mapped
|
|
* LAR archive
|
|
*/
|
|
struct lar {
|
|
int fd; /**< The file descriptor of the open archive */
|
|
u8 *map; /**< A pointer to the mmap()ed file */
|
|
u32 size; /**< Size of the mmaped file */
|
|
};
|
|
|
|
enum compalgo { none = 0, lzma = 1, nrv2b = 2 };
|
|
|
|
typedef void (*compress_func) (char *, u32, char *, u32 *);
|
|
typedef void (*uncompress_func) (char *, char *, u32);
|
|
|
|
void compress_impossible(char *in, u32 in_len, char *out, u32 *out_len);
|
|
void do_no_compress(char *in, u32 in_len, char *out, u32 *out_len);
|
|
void do_lzma_compress(char *in, u32 in_len, char *out, u32 *out_len);
|
|
void do_nrv2b_compress(char *in, u32 in_len, char *out, u32 *out_len);
|
|
|
|
void uncompress_impossible(char *, char *, u32);
|
|
void do_no_uncompress(char *, char *, u32);
|
|
void do_lzma_uncompress(char *, char *, u32);
|
|
void do_nrv2b_uncompress(char *, char *, u32);
|
|
|
|
static compress_func compress_functions[] = {
|
|
do_no_compress,
|
|
do_lzma_compress,
|
|
do_nrv2b_compress,
|
|
};
|
|
|
|
static uncompress_func uncompress_functions[] = {
|
|
do_no_uncompress,
|
|
do_lzma_uncompress,
|
|
do_nrv2b_uncompress,
|
|
};
|
|
|
|
static const char *algo_name[] = {
|
|
"",
|
|
"lzma",
|
|
"nrv2b",
|
|
};
|