1 files changed, 84 insertions, 0 deletions
diff --git a/src/plugin-luaslz.cc b/src/plugin-luaslz.cc
new file mode 100644
index 0000000..5f1cfd4
--- /dev/null
+++ b/src/plugin-luaslz.cc
@@ -0,0 +1,84 @@
+#include <BLua.h>
+#include <lzss.h>
+
+#ifndef WIN32
+#define WEAK __attribute__ ((weak))
+#else
+#define WEAK
+#endif
+
+class sLua_slz : public Base {
+  public:
+    static int slz_decomp(lua_State * __L) {
+        Lua * L = Lua::find(__L);
+        int n = L->gettop();
+        Handle * in, * out;
+        int slz_type;
+        lzss lzss_o;
+        
+        if (n != 2)
+            L->error("Wrong number of arguments to slz_decomp; need two handles.");
+        
+        in = lua_recast<Handle>(L, 1);
+        out = lua_recast<Handle>(L, 2);
+        
+        Uint32 sig, siz_in, siz_out, file_siz;
+        sig = in->readU32();
+        siz_in = in->readU32();
+        siz_out = in->readU32();
+        file_siz = in->readU32();
+        
+        switch (sig) {
+        case 0x05a4c53:
+            out->copyfrom(in, siz_in);
+            slz_type = 0;
+            break;
+        case 0x15a4c53:
+            slz_type = 1;
+            lzss_o.change_scheme(lzss_o.schemes[lzss_o.VP_1]);
+            lzss_o.lzss_decomp(in, out, siz_out, false);
+            break;
+        case 0x25a4c53:
+            slz_type = 2;
+            lzss_o.change_scheme(lzss_o.schemes[lzss_o.VP_2]);
+            lzss_o.lzss_decomp(in, out, siz_out, false);
+            break;
+        case 0x35a4c53:
+            slz_type = 3;
+            Handle::ucl_decompress(in, out, siz_out, siz_in);
+            break;
+        default:
+            L->error("Unknown slz scheme. Expected 0, 1, 2 or 3, got " + String(n));
+            break;
+        }
+
+        if (file_siz)
+            in->seek(file_siz - 16 - siz_in, SEEK_CUR);
+        
+        L->push((lua_Number) file_siz);
+        L->push((lua_Number) slz_type);
+        return 2;
+    }
+    static void pushstatics(Lua * L) {
+        L->declarefunc("slz_decomp", slz_decomp);
+    };
+};
+
+static void _init_plugin(Lua * L) {
+    static bool done = false;
+    if (done) return;
+    done = true;
+    sLua_slz::pushstatics(L);
+}
+
+extern "C" {
+
+WEAK void init_plugin(Lua * L) {
+    _init_plugin(L);
+}
+
+void luaslz_init(Lua * L) {
+    _init_plugin(L);
+}
+
+}