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PhotoRec: find the filesize for Adobe Brush .abr

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This commit is contained in:
Christophe Grenier 2016-09-03 18:23:13 +02:00
parent 5e03dc19dc
commit 7bc1d5a6c2
1 changed files with 38 additions and 2 deletions
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40
src/file_abr.c
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@ -2,7 +2,7 @@
File: file_abr.c File: file_abr.c
Copyright (C) 2012 Christophe GRENIER <grenier@cgsecurity.org> Copyright (C) 2012,2016 Christophe GRENIER <grenier@cgsecurity.org>
This software is free software; you can redistribute it and/or modify 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 it under the terms of the GNU General Public License as published by
@ -29,22 +29,58 @@
#include <stdio.h> #include <stdio.h>
#include "types.h" #include "types.h"
#include "filegen.h" #include "filegen.h"
#include "common.h"
static void register_header_check_abr(file_stat_t *file_stat); static void register_header_check_abr(file_stat_t *file_stat);
struct abr_header
{
char magic[4];
char info[4];
uint32_t size;
} __attribute__ ((gcc_struct, __packed__));
const file_hint_t file_hint_abr= { const file_hint_t file_hint_abr= {
.extension="abr", .extension="abr",
.description="Adobe Brush", .description="Adobe Brush",
.max_filesize=100*1024*1024, .max_filesize=PHOTOREC_MAX_FILE_SIZE,
.recover=1, .recover=1,
.enable_by_default=1, .enable_by_default=1,
.register_header_check=&register_header_check_abr .register_header_check=&register_header_check_abr
}; };
static data_check_t data_check_abr(const unsigned char *buffer, const unsigned int buffer_size, file_recovery_t *file_recovery)
{
while(file_recovery->calculated_file_size + buffer_size/2 >= file_recovery->file_size &&
file_recovery->calculated_file_size + 12 < file_recovery->file_size + buffer_size/2)
{
const unsigned int i=file_recovery->calculated_file_size - file_recovery->file_size + buffer_size/2;
const struct abr_header *hdr=(const struct abr_header*)&buffer[i];
if(memcmp(hdr->magic, "8BIM", 4)!=0)
return DC_STOP;
file_recovery->calculated_file_size+=be32(hdr->size)+12;
}
return DC_CONTINUE;
}
static int header_check_abr(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) static int header_check_abr(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 abr_header *hdr=(const struct abr_header*)&buffer[4];
unsigned int i=4;
while(i + 12 < buffer_size && i + 12 < 512)
{
const struct abr_header *h=(const struct abr_header*)&buffer[i];
if(memcmp(h->magic, "8BIM", 4)!=0)
return 0;
i+=be32(h->size)+12;
}
reset_file_recovery(file_recovery_new); reset_file_recovery(file_recovery_new);
file_recovery_new->extension=file_hint_abr.extension; file_recovery_new->extension=file_hint_abr.extension;
file_recovery_new->min_filesize=4+12+be32(hdr->size);
file_recovery_new->calculated_file_size=4+12+be32(hdr->size);
if(file_recovery_new->blocksize < 12)
return 1;
file_recovery_new->data_check=&data_check_abr;
file_recovery_new->file_check=&file_check_size;
return 1; return 1;
} }