Implement CrashUploadListWin to enable chrome://crashes on Windows.

chrome/browser/crash_upload_list_win.cc

+// Copyright (c) 2011 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/crash_upload_list_win.h"
+
+#include "base/stringprintf.h"
+#include "base/string_util.h"
+#include "base/sys_string_conversions.h"
+
+CrashUploadListWin::CrashUploadListWin(Delegate* delegate)
+    : CrashUploadList(delegate) {}
+
+void CrashUploadListWin::LoadCrashList() {
+  std::vector<uint8> buffer(1024);
+  HANDLE event_log = OpenEventLog(NULL, L"Application");
+  if (event_log) {
+    while (true) {
+      DWORD bytes_read;
+      DWORD bytes_needed;
+      BOOL success =
+          ReadEventLog(event_log,
+                       EVENTLOG_SEQUENTIAL_READ | EVENTLOG_BACKWARDS_READ,
+                       0,
+                       &buffer[0],
+                       buffer.size(),
+                       &bytes_read,
+                       &bytes_needed);
+      if (success) {
+        DWORD record_offset = 0;
+        // The ReadEventLog() API docs imply, but do not explicitly state that
+        // partial records will not be returned. Use DCHECK() to affirm this.
+        while (record_offset < bytes_read) {
+          DCHECK(record_offset + sizeof(EVENTLOGRECORD) <= bytes_read);
+          EVENTLOGRECORD* record = (EVENTLOGRECORD*)&buffer[record_offset];
+          DCHECK(record_offset + record->Length <= bytes_read);
+          if (IsPossibleCrashLogRecord(record))
+            ProcessPossibleCrashLogRecord(record);
+          record_offset += record->Length;
+        }
+      } else if (GetLastError() == ERROR_INSUFFICIENT_BUFFER) {
+        // Resize buffer to the required minimum size.
+        buffer.resize(bytes_needed);
+      } else {
+        // Stop on any other error, including the expected case
+        // of ERROR_HANDLE_EOF.
+        DCHECK(GetLastError() == ERROR_HANDLE_EOF);
+        break;
+      }
+    }
+    CloseEventLog(event_log);
+  }
+}
+
+bool CrashUploadListWin::IsPossibleCrashLogRecord(
+    EVENTLOGRECORD* record) const {
+  LPWSTR provider_name = (LPWSTR)((uint8*)record + sizeof(EVENTLOGRECORD));
+  return !wcscmp(L"Chrome", provider_name) &&
+      record->EventType == EVENTLOG_INFORMATION_TYPE &&
+      record->NumStrings >= 1;
+}
+
+void CrashUploadListWin::ProcessPossibleCrashLogRecord(EVENTLOGRECORD* record) {
+  // Add the crash if the message matches the expected pattern.
+  const std::wstring pattern_prefix(L"Id=");
+  const std::wstring pattern_suffix(L".");
+  std::wstring message((LPWSTR)((uint8*)record + record->StringOffset));
+  size_t start_index = message.find(pattern_prefix);
+  if (start_index != std::wstring::npos) {
+    start_index += pattern_prefix.size();
+    size_t end_index = message.find(pattern_suffix, start_index);
+    if (end_index != std::wstring::npos) {
+      std::wstring crash_id =
+          message.substr(start_index, end_index - start_index);
+      crashes().push_back(
+          CrashInfo(base::SysWideToUTF8(crash_id),
+                    base::Time::FromDoubleT(record->TimeGenerated)));
+    }
+  }
+}