1 files changed, 168 insertions, 0 deletions
diff --git a/src/strife/deh_frame.c b/src/strife/deh_frame.c
new file mode 100644
index 00000000..9383b94f
--- /dev/null
+++ b/src/strife/deh_frame.c
@@ -0,0 +1,168 @@
+// Emacs style mode select   -*- C++ -*- 
+//-----------------------------------------------------------------------------
+//
+// Copyright(C) 2005 Simon Howard
+//
+// This program is free software; you can redistribute it and/or
+// modify it under the terms of the GNU General Public License
+// as published by the Free Software Foundation; either version 2
+// of the License, or (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+// 02111-1307, USA.
+//
+//-----------------------------------------------------------------------------
+//
+// Parses "Frame" sections in dehacked files
+//
+//-----------------------------------------------------------------------------
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "doomtype.h"
+#include "d_items.h"
+#include "info.h"
+
+#include "deh_defs.h"
+#include "deh_io.h"
+#include "deh_main.h"
+#include "deh_mapping.h"
+
+DEH_BEGIN_MAPPING(state_mapping, state_t)
+  DEH_MAPPING("Sprite number",    sprite)
+  DEH_MAPPING("Sprite subnumber", frame)
+  DEH_MAPPING("Duration",         tics)
+  DEH_MAPPING("Next frame",       nextstate)
+  DEH_UNSUPPORTED_MAPPING("Action pointer")
+DEH_END_MAPPING
+
+static void *DEH_FrameStart(deh_context_t *context, char *line)
+{
+    int frame_number = 0;
+    state_t *state;
+    
+    if (sscanf(line, "Frame %i", &frame_number) != 1)
+    {
+        DEH_Warning(context, "Parse error on section start");
+        return NULL;
+    }
+    
+    if (frame_number < 0 || frame_number >= NUMSTATES)
+    {
+        DEH_Warning(context, "Invalid frame number: %i", frame_number);
+        return NULL;
+    }
+
+    if (frame_number >= DEH_VANILLA_NUMSTATES) 
+    {
+        DEH_Warning(context, "Attempt to modify frame %i: this will cause "
+                             "problems in Vanilla dehacked.", frame_number);
+    }
+
+    state = &states[frame_number];
+
+    return state;
+}
+
+// Simulate a frame overflow: Doom has 967 frames in the states[] array, but
+// DOS dehacked internally only allocates memory for 966.  As a result, 
+// attempts to set frame 966 (the last frame) will overflow the dehacked
+// array and overwrite the weaponinfo[] array instead.
+//
+// This is noticable in Batman Doom where it is impossible to switch weapons
+// away from the fist once selected.
+
+static void DEH_FrameOverflow(deh_context_t *context, char *varname, int value)
+{
+    if (!strcasecmp(varname, "Duration"))
+    {
+        weaponinfo[0].ammo = value;
+    }
+    else if (!strcasecmp(varname, "Codep frame")) 
+    {
+        weaponinfo[0].upstate = value;
+    }
+    else if (!strcasecmp(varname, "Next frame")) 
+    {
+        weaponinfo[0].downstate = value;
+    }
+    else if (!strcasecmp(varname, "Unknown 1"))
+    {
+        weaponinfo[0].readystate = value;
+    }
+    else if (!strcasecmp(varname, "Unknown 2"))
+    {
+        weaponinfo[0].atkstate = value;
+    }
+    else
+    {
+        DEH_Error(context, "Unable to simulate frame overflow: field '%s'",
+                  varname);
+    }
+}
+
+static void DEH_FrameParseLine(deh_context_t *context, char *line, void *tag)
+{
+    state_t *state;
+    char *variable_name, *value;
+    int ivalue;
+    
+    if (tag == NULL)
+       return;
+
+    state = (state_t *) tag;
+
+    // Parse the assignment
+
+    if (!DEH_ParseAssignment(line, &variable_name, &value))
+    {
+        // Failed to parse
+
+        DEH_Warning(context, "Failed to parse assignment");
+        return;
+    }
+    
+    // all values are integers
+
+    ivalue = atoi(value);
+    
+    if (state == &states[NUMSTATES - 1])
+    {
+        DEH_FrameOverflow(context, variable_name, ivalue);
+    }
+    else
+    {
+        // set the appropriate field
+
+        DEH_SetMapping(context, &state_mapping, state, variable_name, ivalue);
+    }
+}
+
+static void DEH_FrameMD5Sum(md5_context_t *context)
+{
+    int i;
+
+    for (i=0; i<NUMSTATES; ++i)
+    {
+        DEH_StructMD5Sum(context, &state_mapping, &states[i]);
+    }
+}
+
+deh_section_t deh_section_frame =
+{
+    "Frame",
+    NULL,
+    DEH_FrameStart,
+    DEH_FrameParseLine,
+    NULL,
+    DEH_FrameMD5Sum,
+};
+