From ca64830e53cdae288e80fb8a127c2a86cf141c2f Mon Sep 17 00:00:00 2001
From: Sandro Santilli <strk@keybit.net>
Date: Mon, 13 Apr 2015 13:03:37 +0200
Subject: [PATCH] Fix sigbits decoding to handle the 0-commonbits case

See #67
---
 lib/pc_bytes.c | 28 ++++++++++++++++++++++++----
 1 file changed, 24 insertions(+), 4 deletions(-)

diff --git a/lib/pc_bytes.c b/lib/pc_bytes.c
index 3c91f2a..150ed55 100644
--- a/lib/pc_bytes.c
+++ b/lib/pc_bytes.c
@@ -942,7 +942,12 @@ pc_bytes_sigbits_decode_8(const PCBYTES pcb)
 		int shift = bit - nbits;
 		uint8_t val = *bytes_ptr;
 		/* The unique part is all in this word */
-		if ( shift >= 0 )
+		if ( shift == 0 )
+		{
+			obytes[i] = val;
+			++bytes_ptr;
+		}
+		else if ( shift > 0 )
 		{
 			/* Push unique part to bottom of word */
 			val >>= shift;
@@ -1007,7 +1012,12 @@ pc_bytes_sigbits_decode_16(const PCBYTES pcb)
 	{
 		int shift = bit - nbits;
 		uint16_t val = *bytes_ptr;
-		if ( shift >= 0 )
+		if ( shift == 0 )
+		{
+			obytes[i] = val;
+			++bytes_ptr;
+		}
+		else if ( shift > 0 )
 		{
 			val >>= shift;
 			val &= mask;
@@ -1066,7 +1076,12 @@ pc_bytes_sigbits_decode_32(const PCBYTES pcb)
 	{
 		int shift = bit - nbits;
 		uint32_t val = *bytes_ptr;
-		if ( shift >= 0 )
+		if ( shift == 0 )
+		{
+			obytes[i] = val;
+			++bytes_ptr;
+		}
+		else if ( shift > 0 )
 		{
 			val >>= shift;
 			val &= mask;
@@ -1126,7 +1141,12 @@ pc_bytes_sigbits_decode_64(const PCBYTES pcb)
 	{
 		int shift = bit - nbits;
 		uint64_t val = *bytes_ptr;
-		if ( shift >= 0 )
+		if ( shift == 0 )
+		{
+			obytes[i] = val;
+			++bytes_ptr;
+		}
+		else if ( shift > 0 )
 		{
 			val >>= shift;
 			val &= mask;