PhotoRec: recover PowerArchiver .pa files

src/Makefile.am

@@ -265,6 +265,7 @@ file_C			= filegen.c \
 			  file_ogg.c \
 			  file_one.c \
 			  file_orf.c \
+			  file_pa.c \
 			  file_paf.c \
 			  file_pap.c \
 			  file_par2.c \

src/file_list.c

@@ -679,6 +679,9 @@ extern const file_hint_t file_hint_one;
 #if !defined(SINGLE_FORMAT) || defined(SINGLE_FORMAT_orf)
 extern const file_hint_t file_hint_orf;
 #endif
+#if !defined(SINGLE_FORMAT) || defined(SINGLE_FORMAT_pa)
+extern const file_hint_t file_hint_pa;
+#endif
 #if !defined(SINGLE_FORMAT) || defined(SINGLE_FORMAT_paf)
 extern const file_hint_t file_hint_paf;
 #endif
@@ -1720,6 +1723,9 @@ file_enable_t array_file_enable[]=
 #if !defined(SINGLE_FORMAT) || defined(SINGLE_FORMAT_orf)
   { .enable=0, .file_hint=&file_hint_orf  },
 #endif
+#if !defined(SINGLE_FORMAT) || defined(SINGLE_FORMAT_pa)
+  { .enable=0, .file_hint=&file_hint_pa  },
+#endif
 #if !defined(SINGLE_FORMAT) || defined(SINGLE_FORMAT_paf)
   { .enable=0, .file_hint=&file_hint_paf  },
 #endif

src/file_pa.c

@@ -0,0 +1,79 @@
+/*
+
+    File: file_pa.c
+
+    Copyright (C) 2022 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.
+
+ */
+
+#if !defined(SINGLE_FORMAT) || defined(SINGLE_FORMAT_pa)
+#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"
+
+/*@ requires valid_register_header_check(file_stat); */
+static void register_header_check_pa(file_stat_t *file_stat);
+
+const file_hint_t file_hint_pa= {
+  .extension="pa",
+  .description="PowerArchiver",
+  .max_filesize=PHOTOREC_MAX_FILE_SIZE,
+  .recover=1,
+  .enable_by_default=1,
+  .register_header_check=&register_header_check_pa
+};
+
+struct pa_header
+{
+  char magic[8];
+  uint32_t unk;
+  uint64_t size;
+} __attribute__ ((gcc_struct, __packed__));
+
+/*@
+  @ requires valid_header_check_param(buffer, buffer_size, safe_header_only, file_recovery, file_recovery_new);
+  @ ensures  valid_header_check_result(\result, file_recovery_new);
+  @*/
+static int header_check_pa(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 pa_header *hdr=(const struct pa_header *)buffer;
+  const uint64_t size=le64(hdr->size);
+  if(size > PHOTOREC_MAX_FILE_SIZE)
+    return 0;
+  reset_file_recovery(file_recovery_new);
+  file_recovery_new->extension=file_hint_pa.extension;
+  file_recovery_new->calculated_file_size=70+size;
+  file_recovery_new->data_check=&data_check_size;
+  file_recovery_new->file_check=&file_check_size;
+  return 1;
+}
+
+static void register_header_check_pa(file_stat_t *file_stat)
+{
+  static const unsigned char pa_header[8]=  {
+    'P' , 'a' , 'F' , 'i' , 'L' , 'e' , 0x00, 0x04
+  };
+  register_header_check(0, pa_header, sizeof(pa_header), &header_check_pa, file_stat);
+}
+#endif