PhotoRec: stricter check for tar
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6adba5a0d8
commit
0dd2adf2da
1 changed files with 39 additions and 19 deletions
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@ -27,6 +27,7 @@
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#include <string.h>
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#include <string.h>
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#endif
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#endif
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#include <stdio.h>
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#include <stdio.h>
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#include <ctype.h>
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#include "types.h"
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#include "types.h"
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#include "filegen.h"
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#include "filegen.h"
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#include "file_tar.h"
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#include "file_tar.h"
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@ -43,25 +44,44 @@ const file_hint_t file_hint_tar= {
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.register_header_check=®ister_header_check_tar
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.register_header_check=®ister_header_check_tar
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};
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};
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static const unsigned char tar_header_gnu[6] = { 'u','s','t','a','r',0x00};
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struct posix_header
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static const unsigned char tar_header_posix[8] = { 'u','s','t','a','r',' ',' ',0x00};
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{ /* byte offset */
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char name[100]; /* 0 */
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static void register_header_check_tar(file_stat_t *file_stat)
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char mode[8]; /* 100 */
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{
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char uid[8]; /* 108 */
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register_header_check(0x101, tar_header_gnu,sizeof(tar_header_gnu), &header_check_tar, file_stat);
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char gid[8]; /* 116 */
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register_header_check(0x101, tar_header_posix,sizeof(tar_header_posix), &header_check_tar, file_stat);
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char size[12]; /* 124 */
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}
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char mtime[12]; /* 136 */
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char chksum[8]; /* 148 */
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char typeflag; /* 156 */
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char linkname[100]; /* 157 */
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char magic[6]; /* 257 */
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char version[2]; /* 263 */
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char uname[32]; /* 265 */
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char gname[32]; /* 297 */
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char devmajor[8]; /* 329 */
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char devminor[8]; /* 337 */
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char prefix[155]; /* 345 */
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/* 500 */
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};
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int header_check_tar(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)
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int header_check_tar(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)
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{
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{
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const struct posix_header *h=(const struct posix_header *)buffer;
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if(file_recovery->file_stat!=NULL && file_recovery->file_stat->file_hint==&file_hint_tar)
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if(file_recovery->file_stat!=NULL && file_recovery->file_stat->file_hint==&file_hint_tar)
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return 0;
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return 0;
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if(memcmp(&buffer[0x101],tar_header_gnu,sizeof(tar_header_gnu))==0 ||
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if(!isspace(h->chksum[0]) && !((unsigned) (h->chksum[0]) - '0' <= 7))
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memcmp(&buffer[0x101],tar_header_posix,sizeof(tar_header_posix))==0)
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return 0;
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{
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reset_file_recovery(file_recovery_new);
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reset_file_recovery(file_recovery_new);
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file_recovery_new->extension=file_hint_tar.extension;
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file_recovery_new->extension=file_hint_tar.extension;
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file_recovery_new->min_filesize=512;
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return 1;
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return 1;
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}
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}
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return 0;
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static void register_header_check_tar(file_stat_t *file_stat)
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{
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static const unsigned char tar_header_gnu[6] = { 'u','s','t','a','r',0x00};
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static const unsigned char tar_header_posix[8] = { 'u','s','t','a','r',' ',' ',0x00};
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register_header_check(0x101, tar_header_gnu,sizeof(tar_header_gnu), &header_check_tar, file_stat);
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register_header_check(0x101, tar_header_posix,sizeof(tar_header_posix), &header_check_tar, file_stat);
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}
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}
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