diff options
author | Christophe Grenier <grenier@cgsecurity.org> | 2007-10-29 22:38:52 +0100 |
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committer | Christophe Grenier <grenier@cgsecurity.org> | 2007-10-29 22:38:52 +0100 |
commit | 9928d99936105b4653d2d1b8ca74dc3ffba5c71e (patch) | |
tree | 06aa4f5e9f0055027c6fb54dd47a8414cf2fba32 /src/file_7z.c |
First version in git
Diffstat (limited to 'src/file_7z.c')
-rw-r--r-- | src/file_7z.c | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/src/file_7z.c b/src/file_7z.c new file mode 100644 index 0000000..02c0aef --- /dev/null +++ b/src/file_7z.c @@ -0,0 +1,80 @@ +/* + + File: file_7z.c + + Copyright (C) 2005-2007 Christophe GRENIER <grenier@cgsecurity.org> + + This software 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; either version 2 of the License, or + (at your option) any later version. + + 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 the Free Software Foundation, Inc., 51 + Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + + */ + +#ifdef HAVE_CONFIG_H +#include <config.h> +#endif +#ifdef HAVE_STRING_H +#include <string.h> +#endif +#include <stdio.h> +#include "types.h" +#include "filegen.h" +#include "common.h" + +static void register_header_check_7z(file_stat_t *file_stat); +static int header_check_7z(const unsigned char *buffer, const unsigned int buffer_size, const unsigned int safe_header_only, const file_recovery_t *file_recovery, file_recovery_t *file_recovery_new); + +const file_hint_t file_hint_7z= { + .extension="7z", + .description="7zip archive file", + .min_header_distance=0, + .max_filesize=1024*1024, + .recover=1, + .header_check=&header_check_7z, + .register_header_check=®ister_header_check_7z +}; + +static const unsigned char header_7z[6] = {'7','z', 0xbc, 0xaf, 0x27, 0x1c}; +struct header_7z { + unsigned char signature[6]; + uint8_t majorversion; + uint8_t minorversion; + uint32_t crcFromArchive; + uint64_t nextHeaderOffset; + uint64_t nextHeaderSize; + uint64_t nextHeaderCRC; +} __attribute__ ((__packed__)); + +static void register_header_check_7z(file_stat_t *file_stat) +{ + register_header_check(0, header_7z, sizeof(header_7z), &header_check_7z, file_stat); +} + +static int header_check_7z(const unsigned char *buffer, const unsigned int buffer_size, const unsigned int safe_header_only, const file_recovery_t *file_recovery, file_recovery_t *file_recovery_new) +{ + const struct header_7z *buffer_7z=(const struct header_7z *)buffer; + if(memcmp(buffer,header_7z,sizeof(header_7z))==0) + { + reset_file_recovery(file_recovery_new); + file_recovery_new->extension=file_hint_7z.extension; + file_recovery_new->min_filesize=31; + /* Signature size 12 + Start header size 20 */ + file_recovery_new->calculated_file_size=(uint64_t)le64(buffer_7z->nextHeaderOffset)+ + le64(buffer_7z->nextHeaderSize) + 12 + 20; + file_recovery_new->data_check=&data_check_size; + file_recovery_new->file_check=&file_check_size; + return 1; + } + return 0; +} + |