--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/lib/cdb++/cdb_reader.cc	Wed Jan 16 22:39:43 2008 +0100
@@ -0,0 +1,81 @@
+// Copyright (C) 1999,2000 Bruce Guenter <bruceg@em.ca>
+//
+// 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 2 of the License, or
+// (at your option) any later version.
+//
+// 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, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+#include "cdb++.h"
+#include "internal.h"
+
+#define FAIL do{ abort(); return 0; }while(0)
+
+inline uint32 max(uint32 a, uint32 b)
+{
+  return a > b ? a : b;
+}
+
+cdb_reader::cdb_reader(const mystring& filename)
+  : in(filename.c_str()),
+    failed(!in),
+    eof(false)
+{
+  firstrec();
+}
+
+cdb_reader::~cdb_reader()
+{
+}
+
+void cdb_reader::abort()
+{
+  failed = true;
+  in.close();
+}
+
+bool cdb_reader::firstrec()
+{
+  if(failed) return false;
+  if(!in.seek(0) || !in.read(header, 2048)) {
+    abort();
+    return false;
+  }
+  eof = false;
+  eod = unpack(header);
+  pos = 2048;
+  return true;
+}
+
+datum* cdb_reader::nextrec()
+{
+  if(eof) return 0;
+  if(pos >= eod) {
+    eof = true;
+    return 0;
+  }
+  if(failed || eod-pos < 8 || !in.seek(pos)) FAIL;
+  pos += 8;
+  unsigned char buf[8];
+  if(!in.read(buf, 8)) FAIL;
+  uint32 klen = unpack(buf);
+  uint32 dlen = unpack(buf+4);
+  if (eod - pos < klen) FAIL;
+  pos += klen;
+  if (eod - pos < dlen) FAIL;
+  pos += dlen;
+  char tmp[max(klen, dlen)];
+  if(!in.read(tmp, klen)) FAIL;
+  mystring key(tmp, klen);
+  if(!in.read(tmp, dlen)) FAIL;
+  mystring data(tmp, dlen);
+  return new datum(key, data);
+}