From baef203819ad5490809712332340f6fddf3c9f56 Mon Sep 17 00:00:00 2001
From: Simon Howard
Date: Fri, 13 Jan 2006 02:20:12 +0000
Subject: Signed integer read functions. Use these when reading ticcmd diffs.

Subversion-branch: /trunk/chocolate-doom
Subversion-revision: 287
---
 src/net_packet.c   | 58 +++++++++++++++++++++++++++++++++++++++++++++++++++++-
 src/net_packet.h   | 13 +++++++++++-
 src/net_structrw.c | 46 ++++++++++++++++++++++++++++++++-----------
 3 files changed, 104 insertions(+), 13 deletions(-)

diff --git a/src/net_packet.c b/src/net_packet.c
index 5144382a..14623b4e 100644
--- a/src/net_packet.c
+++ b/src/net_packet.c
@@ -1,7 +1,7 @@
 // Emacs style mode select   -*- C++ -*- 
 //-----------------------------------------------------------------------------
 //
-// $Id: net_packet.c 236 2006-01-01 23:51:41Z fraggle $
+// $Id: net_packet.c 287 2006-01-13 02:20:12Z fraggle $
 //
 // Copyright(C) 2005 Simon Howard
 //
@@ -21,6 +21,9 @@
 // 02111-1307, USA.
 //
 // $Log$
+// Revision 1.3  2006/01/13 02:20:12  fraggle
+// Signed integer read functions.  Use these when reading ticcmd diffs.
+//
 // Revision 1.2  2006/01/01 23:51:41  fraggle
 // String read/write functions
 //
@@ -124,6 +127,59 @@ boolean NET_ReadInt32(net_packet_t *packet, unsigned int *data)
     return true;
 }
 
+// Signed read functions
+
+boolean NET_ReadSInt8(net_packet_t *packet, signed int *data)
+{
+    if (NET_ReadInt8(packet,(unsigned int *) data))
+    {
+        if (*data & (1 << 7))
+        {
+            *data &= ~(1 << 7);
+            *data -= (1 << 7);
+        }
+        return true;
+    }
+    else
+    {
+        return false;
+    }
+}
+
+boolean NET_ReadSInt16(net_packet_t *packet, signed int *data)
+{
+    if (NET_ReadInt16(packet, (unsigned int *) data))
+    {
+        if (*data & (1 << 15))
+        {
+            *data &= ~(1 << 15);
+            *data -= (1 << 15);
+        }
+        return true;
+    }
+    else
+    {
+        return false;
+    }
+}
+
+boolean NET_ReadSInt32(net_packet_t *packet, signed int *data)
+{
+    if (NET_ReadInt32(packet, (unsigned int *) data))
+    {
+        if (*data & (1 << 31))
+        {
+            *data &= ~(1 << 31);
+            *data -= (1 << 31);
+        }
+        return true;
+    }
+    else
+    {
+        return false;
+    }
+}
+
 // Read a string from the packet.  Returns NULL if a terminating 
 // NUL character was not found before the end of the packet.
 
diff --git a/src/net_packet.h b/src/net_packet.h
index f5583d6d..7f1f6346 100644
--- a/src/net_packet.h
+++ b/src/net_packet.h
@@ -1,7 +1,7 @@
 // Emacs style mode select   -*- C++ -*- 
 //-----------------------------------------------------------------------------
 //
-// $Id: net_packet.h 236 2006-01-01 23:51:41Z fraggle $
+// $Id: net_packet.h 287 2006-01-13 02:20:12Z fraggle $
 //
 // Copyright(C) 2005 Simon Howard
 //
@@ -21,6 +21,9 @@
 // 02111-1307, USA.
 //
 // $Log$
+// Revision 1.3  2006/01/13 02:20:12  fraggle
+// Signed integer read functions.  Use these when reading ticcmd diffs.
+//
 // Revision 1.2  2006/01/01 23:51:41  fraggle
 // String read/write functions
 //
@@ -41,13 +44,21 @@
 net_packet_t *NET_NewPacket(int initial_size);
 net_packet_t *NET_PacketDup(net_packet_t *packet);
 void NET_FreePacket(net_packet_t *packet);
+
 boolean NET_ReadInt8(net_packet_t *packet, unsigned int *data);
 boolean NET_ReadInt16(net_packet_t *packet, unsigned int *data);
 boolean NET_ReadInt32(net_packet_t *packet, unsigned int *data);
+
+boolean NET_ReadSInt8(net_packet_t *packet, signed int *data);
+boolean NET_ReadSInt16(net_packet_t *packet, signed int *data);
+boolean NET_ReadSInt32(net_packet_t *packet, signed int *data);
+
 char *NET_ReadString(net_packet_t *packet);
+
 void NET_WriteInt8(net_packet_t *packet, unsigned int i);
 void NET_WriteInt16(net_packet_t *packet, unsigned int i);
 void NET_WriteInt32(net_packet_t *packet, unsigned int i);
+
 void NET_WriteString(net_packet_t *packet, char *string);
 
 #endif /* #ifndef NET_PACKET_H */
diff --git a/src/net_structrw.c b/src/net_structrw.c
index 5c77d102..1905372e 100644
--- a/src/net_structrw.c
+++ b/src/net_structrw.c
@@ -1,7 +1,7 @@
 // Emacs style mode select   -*- C++ -*- 
 //-----------------------------------------------------------------------------
 //
-// $Id: net_structrw.c 281 2006-01-11 01:37:53Z fraggle $
+// $Id: net_structrw.c 287 2006-01-13 02:20:12Z fraggle $
 //
 // Copyright(C) 2005 Simon Howard
 //
@@ -21,6 +21,9 @@
 // 02111-1307, USA.
 //
 // $Log$
+// Revision 1.3  2006/01/13 02:20:12  fraggle
+// Signed integer read functions.  Use these when reading ticcmd diffs.
+//
 // Revision 1.2  2006/01/11 01:37:53  fraggle
 // ticcmd diffs: allow compare and patching ticcmds, and reading/writing
 // ticdiffs to packets.
@@ -59,7 +62,8 @@ boolean NET_ReadSettings(net_packet_t *packet, net_gamesettings_t *settings)
         && NET_ReadInt8(packet, (unsigned int *) &settings->skill);
 }
 
-void NET_WriteTiccmdDiff(net_packet_t *packet, net_ticdiff_t *diff)
+void NET_WriteTiccmdDiff(net_packet_t *packet, net_ticdiff_t *diff, 
+                         boolean lowres_turn)
 {
     // Header
 
@@ -72,7 +76,16 @@ void NET_WriteTiccmdDiff(net_packet_t *packet, net_ticdiff_t *diff)
     if (diff->diff & NET_TICDIFF_SIDE)
         NET_WriteInt8(packet, diff->cmd.sidemove);
     if (diff->diff & NET_TICDIFF_TURN)
-        NET_WriteInt16(packet, diff->cmd.angleturn);
+    {
+        if (lowres_turn)
+        {
+            NET_WriteInt8(packet, diff->cmd.angleturn / 256);
+        }
+        else
+        {
+            NET_WriteInt16(packet, diff->cmd.angleturn);
+        }
+    }
     if (diff->diff & NET_TICDIFF_BUTTONS)
         NET_WriteInt8(packet, diff->cmd.buttons);
     if (diff->diff & NET_TICDIFF_CONSISTANCY)
@@ -81,9 +94,11 @@ void NET_WriteTiccmdDiff(net_packet_t *packet, net_ticdiff_t *diff)
         NET_WriteInt8(packet, diff->cmd.chatchar);
 }
 
-boolean NET_ReadTiccmdDiff(net_packet_t *packet, net_ticdiff_t *diff)
+boolean NET_ReadTiccmdDiff(net_packet_t *packet, net_ticdiff_t *diff,
+                           boolean lowres_turn)
 {
     unsigned int val;
+    signed int sval;
 
     // Read header
 
@@ -94,23 +109,32 @@ boolean NET_ReadTiccmdDiff(net_packet_t *packet, net_ticdiff_t *diff)
 
     if (diff->diff & NET_TICDIFF_FORWARD)
     {
-        if (!NET_ReadInt8(packet, &val))
+        if (!NET_ReadSInt8(packet, &sval))
             return false;
-        diff->cmd.forwardmove = val;
+        diff->cmd.forwardmove = sval;
     }
 
     if (diff->diff & NET_TICDIFF_SIDE)
     {
-        if (!NET_ReadInt8(packet, &val))
+        if (!NET_ReadSInt8(packet, &sval))
             return false;
-        diff->cmd.sidemove = val;
+        diff->cmd.sidemove = sval;
     }
 
     if (diff->diff & NET_TICDIFF_TURN)
     {
-        if (!NET_ReadInt16(packet, &val))
-            return false;
-        diff->cmd.angleturn = val;
+        if (lowres_turn)
+        {
+            if (!NET_ReadSInt8(packet, &sval))
+                return false;
+            diff->cmd.angleturn = sval * 256;
+        }
+        else
+        {
+            if (!NET_ReadSInt16(packet, &sval))
+                return false;
+            diff->cmd.angleturn = sval;
+        }
     }
 
     if (diff->diff & NET_TICDIFF_BUTTONS)
-- 
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