initial code repo

[stor4nfv.git] / src / ceph / src / rbd_replay / rbd_loc.cc

diff --git a/src/ceph/src/rbd_replay/rbd_loc.cc b/src/ceph/src/rbd_replay/rbd_loc.cc
new file mode 100644 (file)
index 0000000..86c50ae
--- /dev/null
+++ b/src/ceph/src/rbd_replay/rbd_loc.cc
@@ -0,0 +1,130 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2014 Adam Crume <adamcrume@gmail.com>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software
+ * Foundation.  See file COPYING.
+ *
+ */
+
+#include "rbd_loc.hpp"
+#include "include/assert.h"
+
+
+using namespace std;
+using namespace rbd_replay;
+
+
+rbd_loc::rbd_loc() {
+}
+
+rbd_loc::rbd_loc(string pool, string image, string snap)
+  : pool(pool),
+    image(image),
+    snap(snap) {
+}
+
+bool rbd_loc::parse(string name_string) {
+  int field = 0;
+  string fields[3];
+  bool read_slash = false;
+  bool read_at = false;
+  for (size_t i = 0, n = name_string.length(); i < n; i++) {
+    char c = name_string[i];
+    switch (c) {
+    case '/':
+      if (read_slash || read_at) {
+       return false;
+      }
+      assert(field == 0);
+      field++;
+      read_slash = true;
+      break;
+    case '@':
+      if (read_at) {
+       return false;
+      }
+      assert(field < 2);
+      field++;
+      read_at = true;
+      break;
+    case '\\':
+      if (i == n - 1) {
+       return false;
+      }
+      fields[field].push_back(name_string[++i]);
+      break;
+    default:
+      fields[field].push_back(c);
+    }
+  }
+
+  if (read_slash) {
+    pool = fields[0];
+    image = fields[1];
+    // note that if read_at is false, then fields[2] is the empty string,
+    // so this is still correct
+    snap = fields[2];
+  } else {
+    pool = "";
+    image = fields[0];
+    // note that if read_at is false, then fields[1] is the empty string,
+    // so this is still correct
+    snap = fields[1];
+  }
+  return true;
+}
+
+
+static void write(const string &in, string *out) {
+  for (size_t i = 0, n = in.length(); i < n; i++) {
+    char c = in[i];
+    if (c == '@' || c == '/' || c == '\\') {
+      out->push_back('\\');
+    }
+    out->push_back(c);
+  }
+}
+
+string rbd_loc::str() const {
+  string out;
+  if (!pool.empty()) {
+    write(pool, &out);
+    out.push_back('/');
+  }
+  write(image, &out);
+  if (!snap.empty()) {
+    out.push_back('@');
+    write(snap, &out);
+  }
+  return out;
+}
+
+int rbd_loc::compare(const rbd_loc& rhs) const {
+  int c = pool.compare(rhs.pool);
+  if (c) {
+    return c;
+  }
+  c = image.compare(rhs.image);
+  if (c) {
+    return c;
+  }
+  c = snap.compare(rhs.snap);
+  if (c) {
+    return c;
+  }
+  return 0;
+}
+
+bool rbd_loc::operator==(const rbd_loc& rhs) const {
+  return compare(rhs) == 0;
+}
+
+bool rbd_loc::operator<(const rbd_loc& rhs) const {
+  return compare(rhs) < 0;
+}