From 9ac3cddf749366f81540aac549ac7583602b7170 Mon Sep 17 00:00:00 2001
From: Josh Allen <axlecrusher@gmail.com>
Date: Fri, 10 Feb 2017 06:54:58 -0500
Subject: crc check decoded data

---
 tools/ootx_decode/HMD_Datagen.c  |  4 +++-
 tools/ootx_decode/Makefile       |  6 +++---
 tools/ootx_decode/crc32.h        | 13 +++++++++++++
 tools/ootx_decode/ootx_decoder.c | 10 +++++++++-
 tools/ootx_decode/ootx_decoder.h |  1 +
 5 files changed, 29 insertions(+), 5 deletions(-)
 create mode 100644 tools/ootx_decode/crc32.h

(limited to 'tools')

diff --git a/tools/ootx_decode/HMD_Datagen.c b/tools/ootx_decode/HMD_Datagen.c
index d71d291..f2e8b19 100644
--- a/tools/ootx_decode/HMD_Datagen.c
+++ b/tools/ootx_decode/HMD_Datagen.c
@@ -10,6 +10,8 @@
 #include <time.h>
 #include <stdlib.h>
 
+#include "crc32.h"
+
 uint32_t time_stamp = -525198892;
 
 char* fmt_str = "L Y HMD %d 5 1 206230 %d\n";
@@ -19,7 +21,7 @@ void print_preamble();
 void print_uint16(uint16_t d);
 void print_uint32(uint32_t d);
 void print_payload(char* data, uint16_t length);
-uint32_t crc32(uint32_t crc, uint8_t *buf, size_t size);
+
 
 int main(int argc, char* argv[])
 {
diff --git a/tools/ootx_decode/Makefile b/tools/ootx_decode/Makefile
index f72cbb5..2c0d01a 100644
--- a/tools/ootx_decode/Makefile
+++ b/tools/ootx_decode/Makefile
@@ -1,7 +1,7 @@
 all: ootx_decode hmd_datagen
 
-hmd_datagen: HMD_Datagen.c crc32.c
+hmd_datagen: HMD_Datagen.c crc32.c crc32.h
 	gcc -Wall HMD_Datagen.c crc32.c -o hmd_datagen
 
-ootx_decode: ootx_decode.c ootx_decoder.c ootx_decoder.h
-	gcc -Wall ootx_decode.c ootx_decoder.c -o ootx_decode
\ No newline at end of file
+ootx_decode: ootx_decode.c ootx_decoder.c ootx_decoder.h crc32.c crc32.h
+	gcc -Wall ootx_decode.c ootx_decoder.c crc32.c -o ootx_decode
\ No newline at end of file
diff --git a/tools/ootx_decode/crc32.h b/tools/ootx_decode/crc32.h
new file mode 100644
index 0000000..c771d4a
--- /dev/null
+++ b/tools/ootx_decode/crc32.h
@@ -0,0 +1,13 @@
+// (C) 2016 Joshua Allen, MIT/x11 License.
+//
+//All MIT/x11 Licensed Code in this file may be relicensed freely under the GPL or LGPL licenses.
+
+#ifndef CRC32_H
+#define CRC32_H
+
+#include <stddef.h>
+#include <stdint.h>
+
+uint32_t crc32(uint32_t crc, uint8_t *buf, size_t size);
+
+#endif
\ No newline at end of file
diff --git a/tools/ootx_decode/ootx_decoder.c b/tools/ootx_decode/ootx_decoder.c
index 70a88b5..2bd818f 100644
--- a/tools/ootx_decode/ootx_decoder.c
+++ b/tools/ootx_decode/ootx_decoder.c
@@ -9,6 +9,7 @@
 
 #include <assert.h>
 #include "ootx_decoder.h"
+#include "crc32.h"
 
 //char* fmt_str = "L Y HMD %d 5 1 206230 %d\n";
 
@@ -103,7 +104,14 @@ void ootx_process_bit(uint32_t length) {
 			op.length = *(uint16_t*)buffer;
 			op.data = buffer+2;
 			op.crc32 = *(uint32_t*)(buffer+2+op.length);
-			if (ootx_packet_clbk) ootx_packet_clbk(&op);
+
+			uint32_t crc = crc32(0xffffffff,op.data,op.length);
+
+			if (crc != op.crc32) {
+				printf("CRC mismatch\n");
+			}
+
+			if ((crc == op.crc32) && ootx_packet_clbk) ootx_packet_clbk(&op);
 
 			ootx_reset_buffer();
 		}
diff --git a/tools/ootx_decode/ootx_decoder.h b/tools/ootx_decode/ootx_decoder.h
index b714b53..3a14f74 100644
--- a/tools/ootx_decode/ootx_decoder.h
+++ b/tools/ootx_decode/ootx_decoder.h
@@ -5,6 +5,7 @@
 #ifndef OOTX_DECODER_H
 #define OOTX_DECODER_H
 
+#include <stddef.h>
 #include <stdint.h>
 
 typedef struct {
-- 
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