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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_png.c
First version in git
Diffstat (limited to 'src/file_png.c')
-rw-r--r--src/file_png.c104
1 files changed, 104 insertions, 0 deletions
diff --git a/src/file_png.c b/src/file_png.c
new file mode 100644
index 0000000..6c8bd44
--- /dev/null
+++ b/src/file_png.c
@@ -0,0 +1,104 @@
+/*
+
+ File: file_png.c
+
+ Copyright (C) 1998-2007 Christophe GRENIER <grenier@cgsecurity.org>
+ Thanks to Holger Klemm for JNG (JPEG Network Graphics) and
+ MNG (Multiple-Image Network Graphics) support (2006)
+
+ 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.
+
+ */
+/*
+ MNG (Multiple-image Network Graphics) Format
+ http://www.libpng.org/pub/mng/spec/
+*/
+
+#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_png(file_stat_t *file_stat);
+static int header_check_png(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 void file_check_png(file_recovery_t *file_recovery);
+
+const file_hint_t file_hint_png= {
+ .extension="png",
+ .description="Portable/JPEG/Multiple-Image Network Graphics",
+ .min_header_distance=0,
+ .max_filesize=PHOTOREC_MAX_FILE_SIZE,
+ .recover=1,
+ .header_check=&header_check_png,
+ .register_header_check=&register_header_check_png
+};
+
+static const unsigned char png_header[8]= { 0x89, 'P', 'N','G', 0x0d, 0x0a, 0x1a, 0x0a};
+static const unsigned char mng_header[8]= { 0x8a, 'M', 'N','G', 0x0d, 0x0a, 0x1a, 0x0a};
+static const unsigned char jng_header[8]= { 0x8b, 'J', 'N','G', 0x0d, 0x0a, 0x1a, 0x0a};
+
+static void register_header_check_png(file_stat_t *file_stat)
+{
+ register_header_check(0, png_header,sizeof(png_header), &header_check_png, file_stat);
+ register_header_check(0, mng_header,sizeof(mng_header), &header_check_png, file_stat);
+ register_header_check(0, jng_header,sizeof(jng_header), &header_check_png, file_stat);
+}
+
+static int header_check_png(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,png_header,sizeof(png_header))==0)
+ {
+ reset_file_recovery(file_recovery_new);
+ file_recovery_new->min_filesize=92;
+ file_recovery_new->file_check=file_check_png;
+ file_recovery_new->extension=file_hint_png.extension;
+ return 1;
+ }
+ if(memcmp(buffer,jng_header,sizeof(jng_header))==0)
+ {
+ reset_file_recovery(file_recovery_new);
+ file_recovery_new->min_filesize=92;
+ file_recovery_new->file_check=file_check_png;
+ file_recovery_new->extension="jng";
+ return 1;
+ }
+ if(memcmp(buffer,mng_header,sizeof(mng_header))==0)
+ {
+ reset_file_recovery(file_recovery_new);
+ file_recovery_new->min_filesize=92;
+ file_recovery_new->file_check=file_check_png;
+ file_recovery_new->extension="mng";
+ return 1;
+ }
+ return 0;
+}
+
+static void file_check_png(file_recovery_t *file_recovery)
+{
+ const unsigned char mng_footer[4]= {'M','E','N','D'};
+ const unsigned char png_footer[4]= {'I','E','N','D'};
+ if(strstr(file_recovery->filename,".mng")!=NULL)
+ file_search_footer(file_recovery, mng_footer,sizeof(mng_footer));
+ else
+ file_search_footer(file_recovery, png_footer,sizeof(png_footer));
+ if(file_recovery->file_size>0)
+ file_recovery->file_size+=4;
+}