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authorChristophe Grenier <grenier@cgsecurity.org>2007-10-29 22:38:52 +0100
committerChristophe Grenier <grenier@cgsecurity.org>2007-10-29 22:38:52 +0100
commit9928d99936105b4653d2d1b8ca74dc3ffba5c71e (patch)
tree06aa4f5e9f0055027c6fb54dd47a8414cf2fba32 /src/file_ace.c
First version in git
Diffstat (limited to 'src/file_ace.c')
-rw-r--r--src/file_ace.c172
1 files changed, 172 insertions, 0 deletions
diff --git a/src/file_ace.c b/src/file_ace.c
new file mode 100644
index 0000000..f62ce9d
--- /dev/null
+++ b/src/file_ace.c
@@ -0,0 +1,172 @@
+/*
+
+ File: file_ace.c
+
+ Copyright (C) 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"
+#include "log.h"
+#include "crc.h"
+
+/* #define DEBUG_ACE */
+
+static void register_header_check_ace(file_stat_t *file_stat);
+static int header_check_ace(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_ace= {
+ .extension="ace",
+ .description="ACE archive",
+ .min_header_distance=0,
+ .max_filesize=PHOTOREC_MAX_FILE_SIZE,
+ .recover=1,
+ .header_check=&header_check_ace,
+ .register_header_check=&register_header_check_ace
+};
+
+static const unsigned char ace_header[7] = { '*','*','A','C','E','*','*'};
+
+static void register_header_check_ace(file_stat_t *file_stat)
+{
+ register_header_check(7, ace_header,sizeof(ace_header), &header_check_ace, file_stat);
+}
+
+struct header_ace {
+ uint16_t crc16; /** Lower 16bits of CRC32 over block up from HEAD_TYPE */
+ uint16_t size; /** Size of the block from HEAD_TYPE
+ up to the beginning of the ADDSIZE block */
+ uint8_t type; /** indicates type of block */
+ uint16_t flags; /** flags related to the block and its content
+ for all blocks these flags are valid.
+ bit 0 indicates if field add size is preset */
+ uint32_t addsize; /** an optional field which represents the size of
+ an additional block without specified structure */
+} __attribute__ ((__packed__));
+typedef struct header_ace ace_header_t;
+
+static void file_check_ace(file_recovery_t *file_recovery)
+{
+ fseek(file_recovery->handle, 0, SEEK_SET);
+
+ file_recovery->file_size = 0;
+ file_recovery->offset_error=0;
+#ifdef DEBUG_ACE
+ log_trace("file_check_ace\n");
+#endif
+ while (!feof(file_recovery->handle))
+ {
+ ace_header_t h;
+ if(fread(&h, sizeof(h), 1, file_recovery->handle)!=1)
+ {
+ return ;
+ }
+ fseek(file_recovery->handle, -sizeof(h)+4, SEEK_CUR);
+
+#ifdef DEBUG_ACE
+ log_trace("file_ace: Block header at 0x%08lx: CRC16=0x%04X size=%u type=%u"
+ " flags=0x%04X addsize=%u\n",
+ (long unsigned) file_recovery->file_size,
+ le16(h.crc16), le16(h.size), h.type, le16(h.flags),
+ (le16(h.flags)&1) ? le32(h.addsize):0);
+#endif
+ /* Type 0=Archive header, 1=File block, 2=Recovery Record, 5 new_recovery ? */
+ if (h.type!=0 && h.type!=1 && h.type!=2 && h.type!=5)
+ {
+#ifdef DEBUG_ACE
+ log_trace("file_ace: Invalid block type %u\n", h.type);
+#endif
+ return ;
+ }
+
+ /* Minimal size is type+flags */
+ if (le16(h.size) < 1+2)
+ {
+#ifdef DEBUG_ACE
+ log_trace("file_ace: Invalid block size %u\n", le16(h.size));
+#endif
+ return ;
+ }
+
+ {
+ /* Header hardly ever bigger than a filename */
+#define BUF_SIZE 256
+ unsigned char buffer[BUF_SIZE];
+ int len=le16(h.size);
+ uint32_t crc32=0xFFFFFFFF;
+
+ while (len>0)
+ {
+ int count = ((len>BUF_SIZE) ? BUF_SIZE : len);
+ int bytes = fread(buffer, 1, count, file_recovery->handle);
+
+ if (bytes != count)
+ {
+#ifdef DEBUG_ACE
+ log_trace("file_ace: truncated file\n");
+#endif
+ return ;
+ }
+ crc32=get_crc32(buffer, count, crc32);
+ len -= count;
+ }
+ if (le16(h.crc16) != (crc32&0xFFFF))
+ {
+#ifdef DEBUG_ACE
+ log_trace("file_ace: bad CRC32: %04X vs %04X\n", le16(h.crc16), crc32);
+#endif
+ return ;
+ }
+ }
+ /* Add its header size */
+ file_recovery->file_size += 2 + 2 + le16(h.size); /* +2: CRC16, +2: size */
+ /* If addsize flag, add complementary size */
+ if (le16(h.flags)&1)
+ {
+ file_recovery->file_size += le32(h.addsize);
+ fseek(file_recovery->handle, file_recovery->file_size, SEEK_SET);
+ }
+ }
+}
+
+static int header_check_ace(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)
+{
+ if(memcmp(&buffer[7],ace_header,sizeof(ace_header))==0 && buffer[4]==0)
+ {
+ reset_file_recovery(file_recovery_new);
+ file_recovery_new->extension=file_hint_ace.extension;
+ file_recovery_new->min_filesize=
+ 2 + /* CRC16 */
+ 2 + /* Head size */
+ 1 + /* Head type */
+ 2 + /* Flags */
+ 7 + /* Signature */
+ 16; /* Minimal size for marker header */
+ file_recovery_new->file_check=&file_check_ace;
+ return 1;
+ }
+ return 0;
+}