Move blockdata to it's own file.

src/blockdata.c

@@ -0,0 +1,99 @@
+/* dnsmasq is Copyright (c) 2000-2014 Simon Kelley
+
+   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; version 2 dated June, 1991, or
+   (at your option) version 3 dated 29 June, 2007.
+ 
+   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, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "dnsmasq.h"
+
+#ifdef HAVE_DNSSEC
+
+static struct blockdata *keyblock_free = NULL;
+
+struct blockdata *blockdata_alloc(char *data, size_t len)
+{
+  struct blockdata *block, *ret = NULL;
+  struct blockdata **prev = &ret;
+  size_t blen;
+
+  while (len > 0)
+    {
+      if (keyblock_free)
+	{
+	  block = keyblock_free;
+	  keyblock_free = block->next;
+	}
+      else
+	block = whine_malloc(sizeof(struct blockdata));
+
+      if (!block)
+	{
+	  /* failed to alloc, free partial chain */
+	  blockdata_free(ret);
+	  return NULL;
+	}
+      
+      blen = len > KEYBLOCK_LEN ? KEYBLOCK_LEN : len;
+      memcpy(block->key, data, blen);
+      data += blen;
+      len -= blen;
+      *prev = block;
+      prev = &block->next;
+      block->next = NULL;
+    }
+  
+  return ret;
+}
+
+size_t blockdata_walk(struct blockdata **key, unsigned char **p, size_t cnt)
+{
+  if (*p == NULL)
+    *p = (*key)->key;
+  else if (*p == (*key)->key + KEYBLOCK_LEN)
+    {
+      *key = (*key)->next;
+      if (*key == NULL)
+        return 0;
+      *p = (*key)->key;
+    }
+
+  return MIN(cnt, (size_t)((*key)->key + KEYBLOCK_LEN - (*p)));
+}
+
+void blockdata_free(struct blockdata *blocks)
+{
+  struct blockdata *tmp;
+
+  if (blocks)
+    {
+      for (tmp = blocks; tmp->next; tmp = tmp->next);
+      tmp->next = keyblock_free;
+      keyblock_free = blocks;
+    }
+}
+
+void  blockdata_retrieve(struct blockdata *block, size_t len, void *data)
+{
+  size_t blen;
+  struct  blockdata *b;
+  
+  for (b = block; len > 0 && b;  b = b->next)
+    {
+      blen = len > KEYBLOCK_LEN ? KEYBLOCK_LEN : len;
+      memcpy(data, b->key, blen);
+      data += blen;
+      len -= blen;
+    }
+}
+  
+#endif