Move parts of dehacked code into top-level common code, to allow future

HHE and SEH support.

Subversion-branch: /branches/raven-branch
Subversion-revision: 1841

1 files changed, 127 insertions, 0 deletions

diff --git a/src/deh_text.c b/src/deh_text.c
new file mode 100644
index 00000000..31e23db2
--- /dev/null
+++ b/src/deh_text.c
@@ -0,0 +1,127 @@
+// 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 Text substitution sections in dehacked files
+//
+//-----------------------------------------------------------------------------
+
+#include <stdio.h>
+#include <string.h>
+
+#include "doomtype.h"
+
+#include "z_zone.h"
+
+#include "deh_defs.h"
+#include "deh_io.h"
+#include "deh_main.h"
+
+// Given a string length, find the maximum length of a 
+// string that can replace it.
+
+static int TXT_MaxStringLength(int len)
+{
+    // Enough bytes for the string and the NUL terminator
+
+    len += 1;
+
+    // All strings in doom.exe are on 4-byte boundaries, so we may be able
+    // to support a slightly longer string.
+    // Extend up to the next 4-byte boundary
+
+    len += (4 - (len % 4)) % 4;
+            
+    // Less one for the NUL terminator.
+
+    return len - 1;
+}
+
+static void *DEH_TextStart(deh_context_t *context, char *line)
+{
+    char *from_text, *to_text;
+    int fromlen, tolen;
+    int i;
+    
+    if (sscanf(line, "Text %i %i", &fromlen, &tolen) != 2)
+    {
+        DEH_Warning(context, "Parse error on section start");
+        return NULL;
+    }
+
+    // Only allow string replacements that are possible in Vanilla Doom.  
+    // Chocolate Doom is unforgiving!
+
+    if (!deh_allow_long_strings && tolen > TXT_MaxStringLength(fromlen))
+    {
+        DEH_Error(context, "Replacement string is longer than the maximum "
+                           "possible in doom.exe");
+        return NULL;
+    }
+
+    from_text = Z_Malloc(fromlen + 1, PU_STATIC, NULL);
+    to_text = Z_Malloc(tolen + 1, PU_STATIC, NULL);
+
+    // read in the "from" text
+
+    for (i=0; i<fromlen; ++i)
+    {
+        int c;
+
+        c = DEH_GetChar(context);
+            
+        from_text[i] = c;
+    }
+
+    from_text[fromlen] = '\0';
+
+    // read in the "to" text
+
+    for (i=0; i<tolen; ++i)
+    {
+        int c;
+
+        c = DEH_GetChar(context);
+            
+        to_text[i] = c;
+    }
+    to_text[tolen] = '\0';
+
+    DEH_AddStringReplacement(from_text, to_text);
+    
+    return NULL;
+}
+
+static void DEH_TextParseLine(deh_context_t *context, char *line, void *tag)
+{
+    // not used
+}
+
+deh_section_t deh_section_text =
+{
+    "Text",
+    NULL,
+    DEH_TextStart,
+    DEH_TextParseLine,
+    NULL,
+    NULL,
+};
+