X-Git-Url: https://git.distorted.org.uk/u/mdw/catacomb/blobdiff_plain/ba6e6b64033b1f9de49feccb5c9cd438354481f7..0f00dc4c8eb47e67bc0f148c2dd109f73a451e0a:/math/gfx-sqr-mktab.c

diff --git a/math/gfx-sqr-mktab.c b/math/gfx-sqr-mktab.c
new file mode 100644
index 0000000..1ecd995
--- /dev/null
+++ b/math/gfx-sqr-mktab.c
@@ -0,0 +1,89 @@
+/* -*-c-*-
+ *
+ * Build table for squaring of binary polynomials
+ *
+ * (c) 2000 Straylight/Edgeware
+ */
+
+/*----- Licensing notice --------------------------------------------------*
+ *
+ * This file is part of Catacomb.
+ *
+ * Catacomb is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Library General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * Catacomb 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 Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with Catacomb; if not, write to the Free
+ * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+ * MA 02111-1307, USA.
+ */
+
+/*----- Header files ------------------------------------------------------*/
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <mLib/bits.h>
+
+/*----- Main code ---------------------------------------------------------*/
+
+static void mktab(uint16 *t)
+{
+  unsigned i, j, x;
+
+  for (i = 0; i < 256; i++) {
+    x = 0;
+    for (j = 0; j < 8; j++) {
+      if (i & (1 << j))
+	x |= 1 << (2 * j);
+    }
+    t[i] = x;
+  }
+}
+
+int main(void)
+{
+  uint16 t[256];
+  unsigned i;
+
+  mktab(t);
+fputs("\
+/* -*-c-*-\n\
+ *\n\
+ * Bit spacing table for binary polynomial squaring\n\
+ */\n\
+\n\
+#ifndef GFX_SQR_TAB_H\n\
+#define GFX_SQR_TAB_H\n\
+\n\
+#define GFX_SQRTAB {							\\\n\
+  ", stdout);
+
+  for (i = 0; i < 256; i++) {
+    printf("0x%04x", t[i]);
+    if (i == 255)
+      puts("	\\\n}\n");
+    else if (i % 8 == 7)
+      fputs(",	\\\n  ", stdout);
+    else
+      fputs(", ", stdout);
+  }
+
+  fputs("#endif\n", stdout);
+
+  if (fclose(stdout)) {
+    fprintf(stderr, "error writing data\n");
+    exit(EXIT_FAILURE);
+  }
+
+  return (0);
+}
+
+/*----- That's all, folks -------------------------------------------------*/