PhotoRec: recover Netpbm (PBM/PGM/PPM) files

3 files changed, 91 insertions, 0 deletions

diff --git a/src/Makefile.am b/src/Makefile.am
index 3cc257f..861ca82 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -158,6 +158,7 @@ file_C			= filegen.c \
 			  file_pdf.c \
 			  file_pfx.c \
 			  file_png.c \
+			  file_pnm.c \
 			  file_prc.c \
 			  file_prt.c \
 			  file_ps.c \
diff --git a/src/file_list.c b/src/file_list.c
index 956c2b3..34f6b0f 100644
--- a/src/file_list.c
+++ b/src/file_list.c
@@ -161,6 +161,7 @@ extern const file_hint_t file_hint_pcx;
 extern const file_hint_t file_hint_pdf;
 extern const file_hint_t file_hint_pfx;
 extern const file_hint_t file_hint_png;
+extern const file_hint_t file_hint_pnm;
 extern const file_hint_t file_hint_prc;
 extern const file_hint_t file_hint_prt;
 extern const file_hint_t file_hint_ps;
@@ -362,6 +363,7 @@ file_enable_t list_file_enable[]=
   { .enable=0, .file_hint=&file_hint_pdf  },
   { .enable=0, .file_hint=&file_hint_pfx  },
   { .enable=0, .file_hint=&file_hint_png  },
+  { .enable=0, .file_hint=&file_hint_pnm  },
   { .enable=0, .file_hint=&file_hint_prc  },
   { .enable=0, .file_hint=&file_hint_prt  },
   { .enable=0, .file_hint=&file_hint_ps   },
diff --git a/src/file_pnm.c b/src/file_pnm.c
new file mode 100644
index 0000000..797c245
--- a/dev/null
+++ b/src/file_pnm.c
@@ -0,0 +1,88 @@
+/*
+
+    File: file_pnm.c
+
+    Copyright (C) 2010 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"
+
+static void register_header_check_pnm(file_stat_t *file_stat);
+static int header_check_pnm(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_pnm= {
+  .extension="pnm",
+  .description="Netpbm (PBM/PGM/PPM)",
+  .min_header_distance=0,
+  .max_filesize=PHOTOREC_MAX_FILE_SIZE,
+  .recover=1,
+  .enable_by_default=1,
+  .register_header_check=&register_header_check_pnm
+};
+
+static const unsigned char p1_header[5]=  { 'P', '1', '\n', '#', ' ' };
+static const unsigned char p2_header[5]=  { 'P', '2', '\n', '#', ' ' };
+static const unsigned char p3_header[5]=  { 'P', '3', '\n', '#', ' ' };
+static const unsigned char p4_header[5]=  { 'P', '4', '\n', '#', ' ' };
+static const unsigned char p5_header[5]=  { 'P', '5', '\n', '#', ' ' };
+static const unsigned char p6_header[5]=  { 'P', '6', '\n', '#', ' ' };
+
+static void register_header_check_pnm(file_stat_t *file_stat)
+{
+  register_header_check(0, p1_header, sizeof(p1_header), &header_check_pnm, file_stat);
+  register_header_check(0, p2_header, sizeof(p2_header), &header_check_pnm, file_stat);
+  register_header_check(0, p3_header, sizeof(p3_header), &header_check_pnm, file_stat);
+  register_header_check(0, p4_header, sizeof(p4_header), &header_check_pnm, file_stat);
+  register_header_check(0, p5_header, sizeof(p5_header), &header_check_pnm, file_stat);
+  register_header_check(0, p6_header, sizeof(p6_header), &header_check_pnm, file_stat);
+}
+
+static int header_check_pnm(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)
+{
+  /* See http://en.wikipedia.org/wiki/Netpbm_format */
+  if(memcmp(buffer, p1_header, sizeof(p1_header))==0 ||
+      memcmp(buffer, p4_header, sizeof(p4_header))==0)
+  {
+    reset_file_recovery(file_recovery_new);
+    file_recovery_new->extension="pbm";
+    return 1;
+  }
+  if(memcmp(buffer, p2_header, sizeof(p2_header))==0 ||
+      memcmp(buffer, p5_header, sizeof(p5_header))==0)
+  {
+    reset_file_recovery(file_recovery_new);
+    file_recovery_new->extension="pgm";
+    return 1;
+  }
+  if(memcmp(buffer, p3_header, sizeof(p3_header))==0 ||
+      memcmp(buffer, p6_header, sizeof(p6_header))==0)
+  {
+    reset_file_recovery(file_recovery_new);
+    file_recovery_new->extension="ppm";
+    return 1;
+  }
+  return 0;
+}