First version in git

1 files changed, 147 insertions, 0 deletions

diff --git a/src/file_pdf.c b/src/file_pdf.c
new file mode 100644
index 00000000..132959e9
--- /dev/null
+++ b/src/file_pdf.c
@@ -0,0 +1,147 @@
+/*
+
+    File: file_pdf.c
+
+    Copyright (C) 1998-2007 Christophe GRENIER <[email protected]>
+  
+    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 inline const unsigned char *find_in_mem(const unsigned char *haystack, const unsigned char * haystack_end,
+    const unsigned char *needle, const unsigned int needle_length);
+
+static void register_header_check_pdf(file_stat_t *file_stat);
+static int header_check_pdf(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_pdf(file_recovery_t *file_recovery);
+static void file_check_pdf_and_size(file_recovery_t *file_recovery);
+
+const file_hint_t file_hint_pdf= {
+  .extension="pdf",
+  .description="Portable Document Format, Adobe Illustrator",
+  .min_header_distance=0,
+  .max_filesize=PHOTOREC_MAX_FILE_SIZE,
+  .recover=1,
+  .header_check=&header_check_pdf,
+  .register_header_check=&register_header_check_pdf
+};
+
+static const unsigned char pdf_header[]  = { '%','P','D','F','-','1'};
+
+static void register_header_check_pdf(file_stat_t *file_stat)
+{
+  register_header_check(0, pdf_header,sizeof(pdf_header), &header_check_pdf, file_stat);
+}
+
+static inline const unsigned char *find_in_mem(const unsigned char *haystack, const unsigned char * haystack_end,
+    const unsigned char *needle, const unsigned int needle_length)
+{
+  while(haystack!=NULL)
+  {
+    haystack=memchr(haystack,needle[0],haystack_end-haystack);
+    if(haystack!=NULL && haystack<=(haystack_end-needle_length))
+    {
+      if(memcmp(haystack,needle,needle_length)==0)
+	return haystack;
+      haystack++;
+    }
+    else
+      haystack=NULL;
+  };
+  return NULL;
+}
+
+static int header_check_pdf(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,pdf_header,sizeof(pdf_header))==0)
+  {
+    const unsigned char sig_illustrator[11]={'I','l','l','u','s','t','r','a','t','o','r'};
+    const unsigned char sig_linearized[10]={'L','i','n','e','a','r','i','z','e','d'};
+    const unsigned char *linearized;
+    reset_file_recovery(file_recovery_new);
+    if(find_in_mem(buffer, buffer+512, sig_illustrator,sizeof(sig_illustrator)) != NULL)
+      file_recovery_new->extension="ai";
+    else
+      file_recovery_new->extension=file_hint_pdf.extension;
+    if((linearized=find_in_mem(buffer, buffer+512, sig_linearized,sizeof(sig_linearized))) != NULL)
+    {
+      linearized+=sizeof(sig_linearized);
+      while(*linearized!='>' && linearized<=buffer+512)
+      {
+	if(*linearized=='/' && *(linearized+1)=='L')
+	{
+	  linearized+=2;
+	  while(*linearized==' ' || *linearized=='\t' || *linearized=='\n' || *linearized=='\r')
+	    linearized++;
+	  file_recovery_new->calculated_file_size=0;
+	  while(*linearized>='0' && *linearized<='9' && linearized<=buffer+512)
+	  {
+	    file_recovery_new->calculated_file_size=file_recovery_new->calculated_file_size*10+(*linearized)-'0';
+	    linearized++;
+	  }
+	  file_recovery_new->data_check=&data_check_size;
+	  file_recovery_new->file_check=&file_check_pdf_and_size;
+	  return 1;
+	}
+	linearized++;
+      }
+    }
+    file_recovery_new->file_check=&file_check_pdf;
+    return 1;
+  }
+  return 0;
+}
+
+static void file_check_pdf_and_size(file_recovery_t *file_recovery)
+{
+  if(file_recovery->file_size>=file_recovery->calculated_file_size)
+  {
+    const unsigned int read_size=20;
+    unsigned char buffer[20+3];	/* read_size+3 */
+    int i;
+    int taille;
+    file_recovery->file_size=file_recovery->calculated_file_size;
+    if(fseek(file_recovery->handle,file_recovery->file_size-read_size,SEEK_SET)<0)
+    {
+      file_recovery->file_size=0;
+      return ;
+    }
+    taille=fread(buffer,1,read_size,file_recovery->handle);
+    for(i=taille-4;i>=0;i--)
+    {
+      if(buffer[i]=='%' && buffer[i+1]=='E' && buffer[i+2]=='O' && buffer[i+3]=='F')
+	return ;
+    }
+  }
+  file_recovery->file_size=0;
+}
+
+static void file_check_pdf(file_recovery_t *file_recovery)
+{
+  const unsigned char pdf_footer[4]= { '%', 'E', 'O', 'F'};
+  file_recovery->file_size=file_recovery->calculated_file_size;
+  file_search_footer(file_recovery, pdf_footer, sizeof(pdf_footer));
+  file_allow_nl(file_recovery, NL_BARENL|NL_CRLF|NL_BARECR);
+}