Initial commit of sync engine code to browser/sync.

The code is not built on any platform yet.  That will arrive
as a subsequent checkin.

This is an implementation of the interface exposed earlier
through syncapi.h.  It is the client side of a sync
protocol that lets users sync their browser data
(currently, just bookmarks) with their Google Account.

Table of contents:

browser/sync/
  protocol - The protocol definition, and
             other definitions necessary to connect to
             the service.
  syncable/ - defines a data model for syncable objects,
              and provides a sqlite-based backing store
              for this model.
  engine/ - includes the core sync logic, including commiting
            changes to the server, downloading changes from
            the server, resolving conflicts, other parts of
            the sync algorithm.
  engine/net - parts of the sync engine focused on the
               business of talking to the server.  Some of
               this is binds a generic "server connection"
               interface to a concrete implementation
               provided by Chromium.
  notifier - the part of the syncer focused on the business
             of sending and receiving xmpp notifications.
             Notifications are used instead of polling to
             achieve very low latency change propagation.
  util - not necessarily sync specific utility code.  Much
         of this is scaffolding which should either be
         replaced by, or merged with, the utility code
         in base/.

BUG=none
TEST=this code includes its own suite of unit tests.

Review URL: http://codereview.chromium.org/194065

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@25850 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 62 insertions, 0 deletions

diff --git a/chrome/browser/sync/util/crypto_helpers.cc b/chrome/browser/sync/util/crypto_helpers.cc
new file mode 100644
index 0000000..c84bfaf
--- /dev/null
+++ b/chrome/browser/sync/util/crypto_helpers.cc
@@ -0,0 +1,62 @@
+// Copyright (c) 2009 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "chrome/browser/sync/util/crypto_helpers.h"
+
+#include <string>
+#include <vector>
+
+#include "base/basictypes.h"
+#include "base/format_macros.h"
+#include "base/logging.h"
+#include "base/rand_util.h"
+#include "base/string_util.h"
+
+using std::string;
+using std::vector;
+
+MD5Calculator::MD5Calculator() {
+  MD5Init(&context_);
+}
+
+void MD5Calculator::AddData(const unsigned char* data, int length) {
+  CHECK(bin_digest_.empty());
+  MD5Update(&context_, data, length);
+}
+
+void MD5Calculator::CalcDigest() {
+  if (bin_digest_.empty()) {
+    MD5Digest digest;
+    MD5Final(&digest, &context_);
+    bin_digest_.assign(digest.a, digest.a + arraysize(digest.a));
+  }
+}
+
+vector<uint8> MD5Calculator::GetDigest() {
+  CalcDigest();
+  return bin_digest_;
+}
+
+PathString MD5Calculator::GetHexDigest() {
+  CalcDigest();
+  string hex = HexEncode(reinterpret_cast<char*>(&bin_digest_.front()),
+                         bin_digest_.size());
+  StringToLowerASCII(&hex);
+  return PathString(hex.begin(), hex.end());
+}
+
+void GetRandomBytes(char* output, int output_length) {
+  for (int i = 0; i < output_length; i++) {
+    // TODO(chron): replace this with something less stupid.
+    output[i] = static_cast<char>(base::RandUint64());
+  }
+}
+
+string Generate128BitRandomHexString() {
+  int64 chunk1 = static_cast<int64>(base::RandUint64());
+  int64 chunk2 = static_cast<int64>(base::RandUint64());
+
+  return StringPrintf("%016" PRId64 "x%016" PRId64 "x",
+      chunk1, chunk2);
+}