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authorChristophe Grenier <grenier@cgsecurity.org>2011-09-17 13:37:02 +0200
committerChristophe Grenier <grenier@cgsecurity.org>2011-09-17 13:37:02 +0200
commit35f3b0289f9e912325515080df3c0b7058cd8938 (patch)
treeac312c3fc2219c86e06c516bec6037c68cb51235 /src/file_caf.c
parented888109f47b349842f950b2dda931f3303e69e4 (diff)
PhotoRec: recover Core Audio Format .caf files
Diffstat (limited to 'src/file_caf.c')
-rw-r--r--src/file_caf.c119
1 files changed, 119 insertions, 0 deletions
diff --git a/src/file_caf.c b/src/file_caf.c
new file mode 100644
index 0000000..b2e18e5
--- /dev/null
+++ b/src/file_caf.c
@@ -0,0 +1,119 @@
+/*
+
+ File: file_caf.c
+
+ Copyright (C) 2011 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"
+//#define DEBUG_CAF
+#ifdef DEBUG_CAF
+#include "log.h"
+#endif
+
+static void register_header_check_caf(file_stat_t *file_stat);
+
+const file_hint_t file_hint_caf= {
+ .extension="caf",
+ .description="Core Audio Format",
+ .min_header_distance=0,
+ .max_filesize=PHOTOREC_MAX_FILE_SIZE,
+ .recover=1,
+ .enable_by_default=1,
+ .register_header_check=&register_header_check_caf
+};
+
+/* http://developer.apple.com/library/mac/documentation/MusicAudio/Reference/CAFSpec/CAF_spec/CAF_spec.html */
+
+static const unsigned char caf_header[12]= {
+ 'c' , 'a' , 'f' , 'f' , 0x00, 0x01, 0x00, 0x00,
+ 'd' , 'e' , 's' , 'c'
+};
+
+struct chunk_struct
+{
+ uint32_t type;
+ int64_t size;
+} __attribute__ ((__packed__));
+
+static int data_check_caf(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 chunk_struct *chunk=(const struct chunk_struct*)&buffer[i];
+ int64_t chunk_size=be64(chunk->size);
+#ifdef DEBUG_CAF
+ log_trace("file_caf.c: %s chunk %c%c%c%c (0x%02x%02x%02x%02x) size %llu, calculated_file_size %llu (0x%llx)\n",
+ file_recovery->filename,
+ buffer[i],buffer[i+1],buffer[i+2],buffer[i+3],
+ buffer[i],buffer[i+1],buffer[i+2],buffer[i+3],
+ (long long unsigned)chunk_size,
+ (long long unsigned)file_recovery->calculated_file_size,
+ (long long unsigned)file_recovery->calculated_file_size);
+#endif
+ if(buffer[i]==0)
+ {
+ file_recovery->calculated_file_size--;
+ return 2;
+ }
+ if(chunk_size >= 0)
+ {
+ file_recovery->calculated_file_size+=12+chunk_size;
+ }
+ else
+ {
+ file_recovery->data_check=NULL;
+ file_recovery->file_check=NULL;
+ }
+ }
+#ifdef DEBUG_CAF
+ log_trace("file_caf.c: new calculated_file_size %llu\n",
+ (long long unsigned)file_recovery->calculated_file_size);
+#endif
+ return 1;
+}
+
+static int header_check_caf(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[0], caf_header, sizeof(caf_header))==0)
+ {
+ reset_file_recovery(file_recovery_new);
+ file_recovery_new->extension=file_hint_caf.extension;
+ file_recovery_new->data_check=data_check_caf;
+ file_recovery_new->file_check=&file_check_size;
+ file_recovery_new->calculated_file_size=8;
+ return 1;
+ }
+ return 0;
+}
+
+static void register_header_check_caf(file_stat_t *file_stat)
+{
+ register_header_check(0, caf_header, sizeof(caf_header), &header_check_caf, file_stat);
+}