From c0e13d3a42e0e41e9dcedff88294ae692b076528 Mon Sep 17 00:00:00 2001
From: bert hubert <bert.hubert@netherlabs.nl>
Date: Mon, 26 Aug 2019 00:17:41 +0200
Subject: [PATCH] glonass special sign support

---
 bits.cc | 8 ++++++++
 bits.hh | 1 +
 2 files changed, 9 insertions(+)

diff --git a/bits.cc b/bits.cc
index 356f801..e7501f4 100644
--- a/bits.cc
+++ b/bits.cc
@@ -15,6 +15,14 @@ int getbits(const unsigned char *buff, int pos, int len)
     return (int)(bits|(~0u<<len)); /* extend sign */
 }
 
+int getbitsglonass(const unsigned char *buff, int pos, int len)
+{
+    int val = getbitu(buff,pos+1,len-1);
+
+    return getbitu(buff,pos,1) ? - val : val;
+}
+
+
 void setbitu(unsigned char *buff, int pos, int len, unsigned int data)
 {
     unsigned int mask=1u<<(len-1);
diff --git a/bits.hh b/bits.hh
index bfc16a8..d45478b 100644
--- a/bits.hh
+++ b/bits.hh
@@ -3,5 +3,6 @@
 
 unsigned int getbitu(const unsigned char *buff, int pos, int len);
 int getbits(const unsigned char *buff, int pos, int len);
+int getbitsglonass(const unsigned char *buff, int pos, int len);
 void setbitu(unsigned char *buff, int pos, int len, unsigned int data);
 unsigned int rtk_crc24q(const unsigned char *buff, int len);