From 16f18cbce84b7160c96b33b618dd00ddd8791246 Mon Sep 17 00:00:00 2001
From: Klaus Schmidinger <vdr@tvdr.de>
Date: Sun, 5 May 2019 18:35:15 +0200
Subject: [PATCH] Fixed updating the checksum in the CA table after mapping EMM
 PIDs for MTD

---
 CONTRIBUTORS |  1 +
 HISTORY      |  2 ++
 ci.c         | 24 +++++++++++++++++-------
 3 files changed, 20 insertions(+), 7 deletions(-)

diff --git a/CONTRIBUTORS b/CONTRIBUTORS
index 786b6804..8e859412 100644
--- a/CONTRIBUTORS
+++ b/CONTRIBUTORS
@@ -3580,6 +3580,7 @@ Helmut Binder <cco@aon.at>
  for reporting a bug in processing SI::T2DeliverySystemDescriptor when typecasting it
  over an SI::ExtensionDescriptor
  for fixing mapping SIDs in MTD
+ for fixing updating the checksum in the CA table after mapping EMM PIDs for MTD
 
 Ulrich Eckhardt <uli@uli-eckhardt.de>
  for reporting a problem with shutdown after user inactivity in case a plugin is
diff --git a/HISTORY b/HISTORY
index b8cb2373..ef14e620 100644
--- a/HISTORY
+++ b/HISTORY
@@ -9395,3 +9395,5 @@ Video Disk Recorder Revision History
   list of (deleted) recordings and thus won't display too much empty disk space.
 - Fixed the install target in case of multiple jobs (thanks to Chris Mayo).
 - Fixed mapping SIDs in MTD (thanks to Helmut Binder).
+- Fixed updating the checksum in the CA table after mapping EMM PIDs for MTD (thanks to
+  Helmut Binder).
diff --git a/ci.c b/ci.c
index a8b065c5..88194986 100644
--- a/ci.c
+++ b/ci.c
@@ -4,7 +4,7 @@
  * See the main source file 'vdr.c' for copyright information and
  * how to reach the author.
  *
- * $Id: ci.c 4.23 2019/03/19 14:58:06 kls Exp $
+ * $Id: ci.c 4.24 2019/05/05 14:15:56 kls Exp $
  */
 
 #include "ci.h"
@@ -225,7 +225,7 @@ void cCaPidReceiver::Receive(const uchar *Data, int Length)
            }
         else {
            esyslog("ERROR: buffer overflow in cCaPidReceiver::Receive()");
-           bufp = 0;
+           bufp = NULL;
            length = 0;
            }
         }
@@ -250,12 +250,22 @@ void cCaPidReceiver::Receive(const uchar *Data, int Length)
                i += p[i + 1] + 2 - 1; // -1 to compensate for the loop increment
                }
             }
-        p = NULL;
-        bufp = 0;
-        length = 0;
-        memcpy(mtdCatBuffer, Data, TS_SIZE);
-        if (MtdCamSlot)
+        if (MtdCamSlot) {
+           if (!bufp && length) {
+              // update crc32 - but only single packet CAT is handled for now:
+              uint32_t crc = SI::CRC32::crc32((const char *)p - 8, length + 8 - 4, 0xFFFFFFFF); // <TableIdCAT....>[crc32]
+              uchar *c = const_cast<uchar *>(p + length - 4);
+              *c++ = crc >> 24;
+              *c++ = crc >> 16;
+              *c++ = crc >> 8;
+              *c++ = crc;
+              }
+           memcpy(mtdCatBuffer, Data, TS_SIZE);
            MtdCamSlot->PutCat(mtdCatBuffer, TS_SIZE);
+           }
+        p = NULL;
+        bufp = NULL;
+        length = 0;
         }
      }
 }