Rearrange the file tree.

[u/mdw/catacomb] / symm / crc32.c

diff --git a/symm/crc32.c b/symm/crc32.c
new file mode 100644 (file)
index 0000000..4b6f27b
--- /dev/null
+++ b/symm/crc32.c
@@ -0,0 +1,89 @@
+/* -*-c-*-
+ *
+ * Generic hash wrapper for CRC32
+ *
+ * (c) 2001 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 <mLib/crc32.h>
+#include <mLib/sub.h>
+
+#include "arena.h"
+#include "crc32.h"
+#include "ghash.h"
+#include "paranoia.h"
+
+/*----- Main code ---------------------------------------------------------*/
+
+typedef struct gctx {
+  ghash h;
+  uint32 c;
+  octet buf[4];
+} gctx;
+
+static const ghash_ops gops;
+
+static ghash *ghinit(void)
+{
+  gctx *g = S_CREATE(gctx);
+  g->h.ops = &gops;
+  g->c = 0;
+  return (&g->h);
+}
+
+static void ghhash(ghash *h, const void *p, size_t sz)
+{
+  gctx *g = (gctx *)h;
+  CRC32(g->c, g->c, p, sz);
+}
+
+static octet *ghdone(ghash *h, void *buf)
+{
+  gctx *g = (gctx *)h;
+  if (!buf)
+    buf = g->buf;
+  STORE32(buf, g->c);
+  return (buf);
+}
+
+static void ghdestroy(ghash *h)
+{
+  gctx *g = (gctx *)h;
+  BURN(*g);
+  S_DESTROY(g);
+}
+
+static ghash *ghcopy(ghash *h)
+{
+  gctx *g = (gctx *)h;
+  gctx *gg = S_CREATE(gctx);
+  memcpy(gg, g, sizeof(gctx));
+  return (&gg->h);
+}
+
+static const ghash_ops gops = { &gcrc32, ghhash, ghdone, ghdestroy, ghcopy };
+const gchash gcrc32 = { "crc32", 4, ghinit };
+
+/*----- That's all, folks -------------------------------------------------*/