From 8290db81fdb2e7d888f41cf0f598197441899cc7 Mon Sep 17 00:00:00 2001
From: Jonathan Naylor <naylorjs@yahoo.com>
Date: Mon, 19 Feb 2018 22:06:04 +0000
Subject: [PATCH] Opionally allow the checksum to be copied.

---
 NXDNFACCH1.cpp | 10 ++++++++--
 NXDNFACCH1.h   |  2 +-
 NXDNSACCH.cpp  | 15 ++++++++++-----
 NXDNSACCH.h    |  2 +-
 NXDNUDCH.cpp   | 10 ++++++++--
 NXDNUDCH.h     |  2 +-
 6 files changed, 29 insertions(+), 12 deletions(-)

diff --git a/NXDNFACCH1.cpp b/NXDNFACCH1.cpp
index 2cc2c42..7f9c7c3 100644
--- a/NXDNFACCH1.cpp
+++ b/NXDNFACCH1.cpp
@@ -148,11 +148,17 @@ void CNXDNFACCH1::encode(unsigned char* data, unsigned int offset) const
 	}
 }
 
-void CNXDNFACCH1::getData(unsigned char* data) const
+void CNXDNFACCH1::getData(unsigned char* data, bool checksum) const
 {
 	assert(data != NULL);
 
-	::memcpy(data, m_data, 10U);
+	if (checksum) {
+		::memset(data, 0x00U, 12U);
+		::memcpy(data, m_data, 10U);
+		CNXDNCRC::encodeCRC12(data, 80U);
+	} else {
+		::memcpy(data, m_data, 10U);
+	}
 }
 
 void CNXDNFACCH1::setData(const unsigned char* data)
diff --git a/NXDNFACCH1.h b/NXDNFACCH1.h
index adb4112..0a9a881 100644
--- a/NXDNFACCH1.h
+++ b/NXDNFACCH1.h
@@ -29,7 +29,7 @@ public:
 
 	void encode(unsigned char* data, unsigned int offset) const;
 
-	void getData(unsigned char* data) const;
+	void getData(unsigned char* data, bool checksum = false) const;
 
 	void setData(const unsigned char* data);
 
diff --git a/NXDNSACCH.cpp b/NXDNSACCH.cpp
index c273799..6c94bad 100755
--- a/NXDNSACCH.cpp
+++ b/NXDNSACCH.cpp
@@ -155,14 +155,19 @@ unsigned char CNXDNSACCH::getStructure() const
 	return (m_data[0U] >> 6) & 0x03U;
 }
 
-void CNXDNSACCH::getData(unsigned char* data) const
+void CNXDNSACCH::getData(unsigned char* data, bool checksum) const
 {
 	assert(data != NULL);
 
-	unsigned int offset = 8U;
-	for (unsigned int i = 0U; i < 18U; i++, offset++) {
-		bool b = READ_BIT1(m_data, offset);
-		WRITE_BIT1(data, i, b);
+	if (checksum) {
+		::memcpy(data, m_data, 4U);
+		CNXDNCRC::encodeCRC6(data, 26U);
+	} else {
+		unsigned int offset = 8U;
+		for (unsigned int i = 0U; i < 18U; i++, offset++) {
+			bool b = READ_BIT1(m_data, offset);
+			WRITE_BIT1(data, i, b);
+		}
 	}
 }
 
diff --git a/NXDNSACCH.h b/NXDNSACCH.h
index c3d7490..c208745 100644
--- a/NXDNSACCH.h
+++ b/NXDNSACCH.h
@@ -32,7 +32,7 @@ public:
 	unsigned char getRAN() const;
 	unsigned char getStructure() const;
 
-	void getData(unsigned char* data) const;
+	void getData(unsigned char* data, bool checksum = false) const;
 
 	void setRAN(unsigned char ran);
 	void setStructure(unsigned char structure);
diff --git a/NXDNUDCH.cpp b/NXDNUDCH.cpp
index c9b3246..47d8413 100644
--- a/NXDNUDCH.cpp
+++ b/NXDNUDCH.cpp
@@ -174,11 +174,17 @@ unsigned char CNXDNUDCH::getRAN() const
 	return m_data[0U] & 0x3FU;
 }
 
-void CNXDNUDCH::getData(unsigned char* data) const
+void CNXDNUDCH::getData(unsigned char* data, bool checksum) const
 {
 	assert(data != NULL);
 
-	::memcpy(data, m_data + 1U, 22U);
+	if (checksum) {
+		::memset(data, 0x00U, 25U);
+		::memcpy(data, m_data, 23U);
+		CNXDNCRC::encodeCRC15(data, 184U);
+	} else {
+		::memcpy(data, m_data + 1U, 22U);
+	}
 }
 
 void CNXDNUDCH::setRAN(unsigned char ran)
diff --git a/NXDNUDCH.h b/NXDNUDCH.h
index 366cd09..738c469 100644
--- a/NXDNUDCH.h
+++ b/NXDNUDCH.h
@@ -31,7 +31,7 @@ public:
 
 	unsigned char getRAN() const;
 
-	void getData(unsigned char* data) const;
+	void getData(unsigned char* data, bool checksum = false) const;
 
 	void setRAN(unsigned char ran);