changed license to GPLv3 only; sorry, no trust to FSF anymore

[d2df-sdl.git] / src / shared / utils.pas

diff --git a/src/shared/utils.pas b/src/shared/utils.pas
index e62cc1c3fccd98571e3e6680a0216e093c452e86..5cd2af8831b8e7a1673338b1895691610f7f463a 100644 (file)
--- a/src/shared/utils.pas
+++ b/src/shared/utils.pas
@@ -2,8 +2,7 @@
  *
  * 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 3 of the License, or
- * (at your option) any later version.
+ * the Free Software Foundation, version 3 of the License ONLY.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ -80,6 +79,9 @@ function isWadPath (const fn: AnsiString): Boolean;
 // adds ".wad" extension if filename doesn't have one of ".wad", ".pk3", ".zip"
 function addWadExtension (const fn: AnsiString): AnsiString;
 
+// check wad signature
+function isWadData (data: Pointer; len: LongWord): Boolean;
+
 // convert number to strig with nice commas
 function int64ToStrComma (i: Int64): AnsiString;
 
@@ -823,6 +825,21 @@ begin
   if not hasWadExtension(result) then result := result+'.wad';
 end;
 
+function isWadData (data: Pointer; len: LongWord): Boolean;
+  var p: PChar;
+begin
+  p := PChar(data);
+  Result :=
+    (* ZIP *)
+    ((len > 3) and (p[0] = 'P') and (p[1] = 'K') and (p[2] = #03) and (p[3] = #04)) or
+    ((len > 3) and (p[0] = 'P') and (p[1] = 'K') and (p[2] = #05) and (p[3] = #06)) or
+    (* PACK *)
+    ((len > 3) and (p[0] = 'P') and (p[1] = 'A') and (p[2] = 'C') and (p[3] = 'K')) or
+    ((len > 3) and (p[0] = 'S') and (p[1] = 'P') and (p[2] = 'A') and (p[3] = 'K')) or
+    (* DFWAD *)
+    ((len > 5) and (p[0] = 'D') and (p[1] = 'F') and (p[2] = 'W') and (p[3] = 'A') and (p[4] = 'D') and (p[5] = #01))
+end;
+
 
 function isWadPath (const fn: AnsiString): Boolean;
 var