[pdf-devel] encryption filters

[jemarch]

Hi all.

For the moment Gerel is no longer able to dedicate time to the
encryption filters (task
http://www.gnupdf.org/flyspray/index.php?do=details&task_id=71&project=2)
so I just marked the task as orphaned in flyspray.

He kindly sent me a preliminary skeleton for the filters code. I
attach it here just in case anyone is interested in getting this task.

##
# Bazaar merge directive format 2 (Bazaar 0.90)
# revision_id: address@hidden
# target_branch: file:///home/gerel/PROJECTS/libgnupdf/trunk/
# testament_sha1: 1c4198e3a67957abde9b25c5b8fd80acdb7846fa
# timestamp: 2008-10-27 10:39:53 -0300
# base_revision_id: address@hidden
# 
# Begin patch
=== modified file 'src/Makefile.am'
--- src/Makefile.am     2008-10-05 15:08:05 +0000
+++ src/Makefile.am     2008-10-07 17:57:30 +0000
@@ -44,7 +44,8 @@
                      base/pdf-stm-filter.h base/pdf-stm-filter.c \
                      base/pdf-stm-f-null.h base/pdf-stm-f-null.c \
                      base/pdf-stm-f-ahex.h base/pdf-stm-f-ahex.c \
-                     base/pdf-stm-f-rl.h base/pdf-stm-f-rl.c
+                     base/pdf-stm-f-rl.h base/pdf-stm-f-rl.c \
+                     base/pdf-stm-f-crypt.h base/pdf-stm-f-crypt.c
 
 if ZLIB
   STM_MODULE_SOURCES += base/pdf-stm-f-flate.c base/pdf-stm-f-flate.h

=== added file 'src/base/pdf-stm-f-crypt.c'
--- src/base/pdf-stm-f-crypt.c  1970-01-01 00:00:00 +0000
+++ src/base/pdf-stm-f-crypt.c  2008-10-27 13:39:42 +0000
@@ -0,0 +1,115 @@
+/* -*- mode: C -*- Time-stamp: "2008-10-27 10:38:22 gerel"
+ *
+ *       File:         pdf-stm-f-crypt.c
+ *       Date:         Tue Jul 10 23:44:00 2007
+ *
+ *       GNU PDF Library - Crypt stream filter
+ *
+ */
+
+/* Copyright (C) 2007, 2008 Free Software Foundation, Inc. */
+
+/* This program 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 3 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, see <http://www.gnu.org/licenses/>.
+ */
+
+
+#include <pdf-stm-f-crypt.h>
+
+
+pdf_status_t
+pdf_stm_f_cryptdec_init (pdf_hash_t params, void **state)
+{
+  pdf_status_t ret;
+  pdf_stm_f_crypt_t filter_state;
+
+  filter_state = pdf_alloc (sizeof (struct pdf_stm_f_crypt_s));
+
+  if (state == NULL)
+    {
+      ret = PDF_EBADDATA;
+    }
+  else if (filter_state == NULL)
+    {
+      ret = PDF_ENOMEM;
+    }
+  else
+    {
+      /* Initialize fields */
+      //filter_state->blabla = blabla;
+      ret = PDF_OK;
+    }
+
+  return ret;
+}
+
+
+pdf_status_t
+pdf_stm_f_cryptdec_apply (pdf_hash_t params, void *state, pdf_stm_buffer_t in,
+                        pdf_stm_buffer_t out, pdf_bool_t finish_p)
+{
+  return PDF_OK;
+}
+
+pdf_status_t
+pdf_stm_f_cryptenc_init (pdf_hash_t params, void **state)
+{
+  pdf_status_t ret;
+  pdf_stm_f_crypt_t filter_state;
+
+  filter_state = pdf_alloc (sizeof (struct pdf_stm_f_crypt_s));
+
+  if (state == NULL)
+    {
+      ret = PDF_EBADDATA;
+    }
+  else if (filter_state == NULL)
+    {
+      ret = PDF_ENOMEM;
+    }
+  else
+    {
+      /* Initialize fields */
+      //filter_state->blabla = blabla;
+      ret = PDF_OK;
+    }
+
+  return ret;
+}
+
+pdf_status_t
+pdf_stm_f_cryptenc_apply (pdf_hash_t params, void *state, pdf_stm_buffer_t in,
+                        pdf_stm_buffer_t out, pdf_bool_t finish_p)
+{
+  return PDF_OK;
+}
+
+
+pdf_status_t
+pdf_stm_f_cryptdec_dealloc_state (void *state)
+{
+  pdf_dealloc (state);
+  return PDF_OK;
+}
+
+
+pdf_status_t
+pdf_stm_f_cryptenc_dealloc_state (void *state)
+{
+  pdf_dealloc (state);
+  return PDF_OK;
+}
+
+
+
+/* End of pdf_stm_f_crypt.c */

=== added file 'src/base/pdf-stm-f-crypt.h'
--- src/base/pdf-stm-f-crypt.h  1970-01-01 00:00:00 +0000
+++ src/base/pdf-stm-f-crypt.h  2008-10-07 17:57:30 +0000
@@ -0,0 +1,73 @@
+/* -*- mode: C -*- Time-stamp: "2008-10-07 14:54:39 gerel"
+ *
+ *       File:         pdf-stm-f-crypt.h
+ *       Date:         Sun Jul 15 21:57:35 2007
+ *
+ *       GNU PDF Library - Crypt stream filter
+ *
+ */
+
+/* Copyright (C) 2007, 2008 Free Software Foundation, Inc. */
+
+/* This program 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 3 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef PDF_STM_F_CRYPT_H
+#define PDF_STM_F_CRYPT_H
+
+#include <config.h>
+#include <pdf-types.h>
+#include <pdf-hash.h>
+#include <pdf-alloc.h>
+#include <pdf-stm-buffer.h>
+#include <stdio.h>
+
+
+struct pdf_stm_f_crypt_s
+{
+
+};
+
+typedef struct pdf_stm_f_crypt_s * pdf_stm_f_crypt_t;
+
+
+/* Filter API implementation */
+
+pdf_status_t pdf_stm_f_cryptdec_init (pdf_hash_t params,
+                                      void **state);
+
+pdf_status_t pdf_stm_f_cryptdec_apply (pdf_hash_t params,
+                                       void *state,
+                                       pdf_stm_buffer_t in,
+                                       pdf_stm_buffer_t out,
+                                       pdf_bool_t finish_p);
+
+pdf_status_t pdf_stm_f_cryptenc_init (pdf_hash_t params,
+                                      void **state);
+
+pdf_status_t pdf_stm_f_cryptenc_apply (pdf_hash_t params,
+                                       void *state,
+                                       pdf_stm_buffer_t in,
+                                       pdf_stm_buffer_t out,
+                                       pdf_bool_t finish_p);
+
+pdf_status_t pdf_stm_f_cryptdec_dealloc_state (void *state);
+pdf_status_t pdf_stm_f_cryptenc_dealloc_state (void *state);
+
+
+
+
+#endif /* pdf_stm_f_crypt.h */
+
+/* End of pdf_stm_f_crypt.h */

=== modified file 'src/base/pdf-stm-filter.c'
--- src/base/pdf-stm-filter.c   2008-10-12 19:28:11 +0000
+++ src/base/pdf-stm-filter.c   2008-10-27 13:39:42 +0000
@@ -1,4 +1,4 @@
-/* -*- mode: C -*- Time-stamp: "08/10/12 18:34:54 jemarch"
+/* -*- mode: C -*- Time-stamp: "2008-10-27 10:27:54 gerel"
  *
  *       File:         pdf-stm-filter.c
  *       Date:         Thu Jun 12 22:13:31 2008
@@ -97,6 +97,7 @@
         new->impl.dealloc_state_fn = pdf_stm_f_rldec_dealloc_state;
         break;
       }
+
 #if defined(HAVE_LIBZ)
     case PDF_STM_FILTER_FLATE_ENC:
       {
@@ -113,6 +114,22 @@
         break;
       }
 #endif /* HAVE_LIBZ */
+
+    case PDF_STM_FILTER_CRYPT_ENC:
+      {
+        new->impl.init_fn = pdf_stm_f_cryptenc_init;
+        new->impl.apply_fn = pdf_stm_f_cryptenc_apply;
+        new->impl.dealloc_state_fn = pdf_stm_f_cryptenc_dealloc_state;
+        break;
+      }
+    case PDF_STM_FILTER_CRYPT_DEC:
+      {
+        new->impl.init_fn = pdf_stm_f_cryptdec_init;
+        new->impl.apply_fn = pdf_stm_f_cryptdec_apply;
+        new->impl.dealloc_state_fn = pdf_stm_f_cryptdec_dealloc_state;
+        break;
+      }
+
     default:
       {
         /* Shall not be reached, but makes the compiler happy */

=== modified file 'src/base/pdf-stm-filter.h'
--- src/base/pdf-stm-filter.h   2008-10-12 19:28:11 +0000
+++ src/base/pdf-stm-filter.h   2008-10-27 13:39:42 +0000
@@ -1,4 +1,4 @@
-/* -*- mode: C -*- Time-stamp: "08/10/12 18:33:23 jemarch"
+/* -*- mode: C -*- Time-stamp: "2008-10-27 10:29:03 gerel"
  *
  *       File:         pdf-stm-filter.h
  *       Date:         Thu Jun 12 22:05:06 2008
@@ -35,6 +35,7 @@
 #include <pdf-stm-f-null.h>
 #include <pdf-stm-f-ahex.h>
 #include <pdf-stm-f-rl.h>
+#include <pdf-stm-f-crypt.h>
 
 #if defined(HAVE_LIBZ)
 #  include <pdf-stm-f-flate.h>
@@ -51,7 +52,9 @@
   PDF_STM_FILTER_RL_ENC,
   PDF_STM_FILTER_RL_DEC,
   PDF_STM_FILTER_FLATE_ENC,
-  PDF_STM_FILTER_FLATE_DEC
+  PDF_STM_FILTER_FLATE_DEC,
+  PDF_STM_FILTER_CRYPT_ENC,
+  PDF_STM_FILTER_CRYPT_DEC
 
 };
 

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###