Leveldb Windows port by Edouard Alligand, adapted for MingW by me.

8 files changed, 1106 insertions, 33 deletions

diff --git a/src/leveldb/Makefile b/src/leveldb/Makefile
index c648a285ea..7f658cfdf9 100644..100755
--- a/src/leveldb/Makefile
+++ b/src/leveldb/Makefile
@@ -82,7 +82,7 @@ $(SHARED2): $(SHARED3)
 endif
 
 $(SHARED3):
-	$(CXX) $(LDFLAGS) $(PLATFORM_SHARED_LDFLAGS)$(SHARED2) $(CXXFLAGS) $(PLATFORM_SHARED_CFLAGS) $(SOURCES) -o $(SHARED3)
+	$(CXX) $(LDFLAGS) $(PLATFORM_SHARED_LDFLAGS)$(SHARED2) $(CXXFLAGS) $(PLATFORM_SHARED_CFLAGS) $(SOURCES) $(PLATFORM_EXTRALIBS) -o $(SHARED3)
 
 endif  # PLATFORM_SHARED_EXT
 
@@ -100,74 +100,74 @@ $(LIBRARY): $(LIBOBJECTS)
 	$(AR) -rs $@ $(LIBOBJECTS)
 
 db_bench: db/db_bench.o $(LIBOBJECTS) $(TESTUTIL)
-	$(CXX) db/db_bench.o $(LIBOBJECTS) $(TESTUTIL) -o $@  $(LDFLAGS)
+	$(CXX) db/db_bench.o $(LIBOBJECTS) $(TESTUTIL) -o $@  $(LDFLAGS) $(PLATFORM_EXTRALIBS)
 
 db_bench_sqlite3: doc/bench/db_bench_sqlite3.o $(LIBOBJECTS) $(TESTUTIL)
-	$(CXX) doc/bench/db_bench_sqlite3.o $(LIBOBJECTS) $(TESTUTIL) -o $@ $(LDFLAGS) -lsqlite3
+	$(CXX) doc/bench/db_bench_sqlite3.o $(LIBOBJECTS) $(TESTUTIL) -o $@ $(LDFLAGS) $(PLATFORM_EXTRALIBS) -lsqlite3
 
 db_bench_tree_db: doc/bench/db_bench_tree_db.o $(LIBOBJECTS) $(TESTUTIL)
-	$(CXX) doc/bench/db_bench_tree_db.o $(LIBOBJECTS) $(TESTUTIL) -o $@ $(LDFLAGS) -lkyotocabinet
+	$(CXX) doc/bench/db_bench_tree_db.o $(LIBOBJECTS) $(TESTUTIL) -o $@ $(LDFLAGS) $(PLATFORM_EXTRALIBS) -lkyotocabinet
 
 arena_test: util/arena_test.o $(LIBOBJECTS) $(TESTHARNESS)
-	$(CXX) util/arena_test.o $(LIBOBJECTS) $(TESTHARNESS) -o $@ $(LDFLAGS)
+	$(CXX) util/arena_test.o $(LIBOBJECTS) $(TESTHARNESS) -o $@ $(LDFLAGS) $(PLATFORM_EXTRALIBS)
 
 bloom_test: util/bloom_test.o $(LIBOBJECTS) $(TESTHARNESS)
-	$(CXX) util/bloom_test.o $(LIBOBJECTS) $(TESTHARNESS) -o $@ $(LDFLAGS)
+	$(CXX) util/bloom_test.o $(LIBOBJECTS) $(TESTHARNESS) -o $@ $(LDFLAGS) $(PLATFORM_EXTRALIBS)
 
 c_test: db/c_test.o $(LIBOBJECTS) $(TESTHARNESS)
-	$(CXX) db/c_test.o $(LIBOBJECTS) $(TESTHARNESS) -o $@ $(LDFLAGS)
+	$(CXX) db/c_test.o $(LIBOBJECTS) $(TESTHARNESS) -o $@ $(LDFLAGS) $(PLATFORM_EXTRALIBS)
 
 cache_test: util/cache_test.o $(LIBOBJECTS) $(TESTHARNESS)
-	$(CXX) util/cache_test.o $(LIBOBJECTS) $(TESTHARNESS) -o $@ $(LDFLAGS)
+	$(CXX) util/cache_test.o $(LIBOBJECTS) $(TESTHARNESS) -o $@ $(LDFLAGS) $(PLATFORM_EXTRALIBS)
 
 coding_test: util/coding_test.o $(LIBOBJECTS) $(TESTHARNESS)
-	$(CXX) util/coding_test.o $(LIBOBJECTS) $(TESTHARNESS) -o $@ $(LDFLAGS)
+	$(CXX) util/coding_test.o $(LIBOBJECTS) $(TESTHARNESS) -o $@ $(LDFLAGS) $(PLATFORM_EXTRALIBS)
 
 corruption_test: db/corruption_test.o $(LIBOBJECTS) $(TESTHARNESS)
-	$(CXX) db/corruption_test.o $(LIBOBJECTS) $(TESTHARNESS) -o $@ $(LDFLAGS)
+	$(CXX) db/corruption_test.o $(LIBOBJECTS) $(TESTHARNESS) -o $@ $(LDFLAGS) $(PLATFORM_EXTRALIBS)
 
 crc32c_test: util/crc32c_test.o $(LIBOBJECTS) $(TESTHARNESS)
-	$(CXX) util/crc32c_test.o $(LIBOBJECTS) $(TESTHARNESS) -o $@ $(LDFLAGS)
+	$(CXX) util/crc32c_test.o $(LIBOBJECTS) $(TESTHARNESS) -o $@ $(LDFLAGS) $(PLATFORM_EXTRALIBS)
 
 db_test: db/db_test.o $(LIBOBJECTS) $(TESTHARNESS)
-	$(CXX) db/db_test.o $(LIBOBJECTS) $(TESTHARNESS) -o $@ $(LDFLAGS)
+	$(CXX) db/db_test.o $(LIBOBJECTS) $(TESTHARNESS) -o $@ $(LDFLAGS) $(PLATFORM_EXTRALIBS)
 
 dbformat_test: db/dbformat_test.o $(LIBOBJECTS) $(TESTHARNESS)
-	$(CXX) db/dbformat_test.o $(LIBOBJECTS) $(TESTHARNESS) -o $@ $(LDFLAGS)
+	$(CXX) db/dbformat_test.o $(LIBOBJECTS) $(TESTHARNESS) -o $@ $(LDFLAGS) $(PLATFORM_EXTRALIBS)
 
 env_test: util/env_test.o $(LIBOBJECTS) $(TESTHARNESS)
-	$(CXX) util/env_test.o $(LIBOBJECTS) $(TESTHARNESS) -o $@ $(LDFLAGS)
+	$(CXX) util/env_test.o $(LIBOBJECTS) $(TESTHARNESS) -o $@ $(LDFLAGS) $(PLATFORM_EXTRALIBS)
 
 filename_test: db/filename_test.o $(LIBOBJECTS) $(TESTHARNESS)
-	$(CXX) db/filename_test.o $(LIBOBJECTS) $(TESTHARNESS) -o $@ $(LDFLAGS)
+	$(CXX) db/filename_test.o $(LIBOBJECTS) $(TESTHARNESS) -o $@ $(LDFLAGS) $(PLATFORM_EXTRALIBS)
 
 filter_block_test: table/filter_block_test.o $(LIBOBJECTS) $(TESTHARNESS)
-	$(CXX) table/filter_block_test.o $(LIBOBJECTS) $(TESTHARNESS) -o $@ $(LDFLAGS)
+	$(CXX) table/filter_block_test.o $(LIBOBJECTS) $(TESTHARNESS) -o $@ $(LDFLAGS) $(PLATFORM_EXTRALIBS)
 
 log_test: db/log_test.o $(LIBOBJECTS) $(TESTHARNESS)
-	$(CXX) db/log_test.o $(LIBOBJECTS) $(TESTHARNESS) -o $@ $(LDFLAGS)
+	$(CXX) db/log_test.o $(LIBOBJECTS) $(TESTHARNESS) -o $@ $(LDFLAGS) $(PLATFORM_EXTRALIBS)
 
 table_test: table/table_test.o $(LIBOBJECTS) $(TESTHARNESS)
-	$(CXX) table/table_test.o $(LIBOBJECTS) $(TESTHARNESS) -o $@ $(LDFLAGS)
+	$(CXX) table/table_test.o $(LIBOBJECTS) $(TESTHARNESS) -o $@ $(LDFLAGS) $(PLATFORM_EXTRALIBS)
 
 skiplist_test: db/skiplist_test.o $(LIBOBJECTS) $(TESTHARNESS)
-	$(CXX) db/skiplist_test.o $(LIBOBJECTS) $(TESTHARNESS) -o $@ $(LDFLAGS)
+	$(CXX) db/skiplist_test.o $(LIBOBJECTS) $(TESTHARNESS) -o $@ $(LDFLAGS) $(PLATFORM_EXTRALIBS)
 
 version_edit_test: db/version_edit_test.o $(LIBOBJECTS) $(TESTHARNESS)
-	$(CXX) db/version_edit_test.o $(LIBOBJECTS) $(TESTHARNESS) -o $@ $(LDFLAGS)
+	$(CXX) db/version_edit_test.o $(LIBOBJECTS) $(TESTHARNESS) -o $@ $(LDFLAGS) $(PLATFORM_EXTRALIBS)
 
 version_set_test: db/version_set_test.o $(LIBOBJECTS) $(TESTHARNESS)
-	$(CXX) db/version_set_test.o $(LIBOBJECTS) $(TESTHARNESS) -o $@ $(LDFLAGS)
+	$(CXX) db/version_set_test.o $(LIBOBJECTS) $(TESTHARNESS) -o $@ $(LDFLAGS) $(PLATFORM_EXTRALIBS)
 
 write_batch_test: db/write_batch_test.o $(LIBOBJECTS) $(TESTHARNESS)
-	$(CXX) db/write_batch_test.o $(LIBOBJECTS) $(TESTHARNESS) -o $@ $(LDFLAGS)
+	$(CXX) db/write_batch_test.o $(LIBOBJECTS) $(TESTHARNESS) -o $@ $(LDFLAGS) $(PLATFORM_EXTRALIBS)
 
 $(MEMENVLIBRARY) : $(MEMENVOBJECTS)
 	rm -f $@
 	$(AR) -rs $@ $(MEMENVOBJECTS)
 
 memenv_test : helpers/memenv/memenv_test.o $(MEMENVLIBRARY) $(LIBRARY) $(TESTHARNESS)
-	$(CXX) helpers/memenv/memenv_test.o $(MEMENVLIBRARY) $(LIBRARY) $(TESTHARNESS) -o $@ $(LDFLAGS)
+	$(CXX) helpers/memenv/memenv_test.o $(MEMENVLIBRARY) $(LIBRARY) $(TESTHARNESS) -o $@ $(LDFLAGS) $(PLATFORM_EXTRALIBS)
 
 ifeq ($(PLATFORM), IOS)
 # For iOS, create universal object files to be used on both the simulator and
diff --git a/src/leveldb/build_detect_platform b/src/leveldb/build_detect_platform
index 959a7d6f59..5a8d723734 100755
--- a/src/leveldb/build_detect_platform
+++ b/src/leveldb/build_detect_platform
@@ -50,6 +50,8 @@ CROSS_COMPILE=
 PLATFORM_CCFLAGS=
 PLATFORM_CXXFLAGS=
 PLATFORM_LDFLAGS=
+PLATFORM_EXTRALIBS=
+PLATFORM_SOURCES=
 PLATFORM_SHARED_EXT="so"
 PLATFORM_SHARED_LDFLAGS="-shared -Wl,-soname -Wl,"
 PLATFORM_SHARED_CFLAGS="-fPIC"
@@ -62,49 +64,59 @@ case "$TARGET_OS" in
         COMMON_FLAGS="-fno-builtin-memcmp -DOS_MACOSX"
         PLATFORM_SHARED_EXT=dylib
         PLATFORM_SHARED_LDFLAGS="-dynamiclib -install_name "
-        PORT_FILE=port/port_posix.cc
+        PLATFORM_SOURCES="port/port_posix.cc util/env_posix.cc"
         ;;
     Linux)
         PLATFORM=OS_LINUX
         COMMON_FLAGS="-fno-builtin-memcmp -pthread -DOS_LINUX"
         PLATFORM_LDFLAGS="-pthread"
-        PORT_FILE=port/port_posix.cc
+        PLATFORM_SOURCES="port/port_posix.cc util/env_posix.cc"
         ;;
     SunOS)
         PLATFORM=OS_SOLARIS
         COMMON_FLAGS="-fno-builtin-memcmp -D_REENTRANT -DOS_SOLARIS"
         PLATFORM_LDFLAGS="-lpthread -lrt"
-        PORT_FILE=port/port_posix.cc
+        PLATFORM_SOURCES="port/port_posix.cc util/env_posix.cc"
         ;;
     FreeBSD)
         PLATFORM=OS_FREEBSD
         COMMON_FLAGS="-fno-builtin-memcmp -D_REENTRANT -DOS_FREEBSD"
         PLATFORM_LDFLAGS="-lpthread"
-        PORT_FILE=port/port_posix.cc
+        PLATFORM_SOURCES="port/port_posix.cc util/env_posix.cc"
         ;;
     NetBSD)
         PLATFORM=OS_NETBSD
         COMMON_FLAGS="-fno-builtin-memcmp -D_REENTRANT -DOS_NETBSD"
         PLATFORM_LDFLAGS="-lpthread -lgcc_s"
-        PORT_FILE=port/port_posix.cc
+        PLATFORM_SOURCES="port/port_posix.cc util/env_posix.cc"
         ;;
     OpenBSD)
         PLATFORM=OS_OPENBSD
         COMMON_FLAGS="-fno-builtin-memcmp -D_REENTRANT -DOS_OPENBSD"
         PLATFORM_LDFLAGS="-pthread"
-        PORT_FILE=port/port_posix.cc
+        PLATFORM_SOURCES="port/port_posix.cc util/env_posix.cc"
         ;;
     DragonFly)
         PLATFORM=OS_DRAGONFLYBSD
         COMMON_FLAGS="-fno-builtin-memcmp -D_REENTRANT -DOS_DRAGONFLYBSD"
         PLATFORM_LDFLAGS="-lpthread"
-        PORT_FILE=port/port_posix.cc
+        PLATFORM_SOURCES="port/port_posix.cc util/env_posix.cc"
         ;;
     OS_ANDROID_CROSSCOMPILE)
         PLATFORM=OS_ANDROID
         COMMON_FLAGS="-fno-builtin-memcmp -D_REENTRANT -DOS_ANDROID -DLEVELDB_PLATFORM_POSIX"
         PLATFORM_LDFLAGS=""  # All pthread features are in the Android C library
-        PORT_FILE=port/port_posix.cc
+        PLATFORM_SOURCES="port/port_posix.cc util/env_posix.cc"
+        CROSS_COMPILE=true
+        ;;
+    OS_WINDOWS_CROSSCOMPILE)
+        PLATFORM=OS_WINDOWS
+        COMMON_FLAGS="-fno-builtin-memcmp -D_REENTRANT -DOS_WINDOWS -DLEVELDB_PLATFORM_WINDOWS -DBOOST_THREAD_USE_LIB"
+        PLATFORM_CXXFLAGS="-std=c++0x"
+        PLATFORM_LDFLAGS=""
+        PLATFORM_SHARED_CFLAGS=""
+        PLATFORM_SOURCES="port/port_win.cc util/env_boost.cc util/win_logger.cc"
+        PLATFORM_EXTRALIBS="-lboost_system-mt-s -lboost_filesystem-mt-s -lboost_thread_win32-mt-s"
         CROSS_COMPILE=true
         ;;
     *)
@@ -120,12 +132,12 @@ DIRS="util db table"
 set -f # temporarily disable globbing so that our patterns aren't expanded
 PRUNE_TEST="-name *test*.cc -prune"
 PRUNE_BENCH="-name *_bench.cc -prune"
-PORTABLE_FILES=`find $DIRS $PRUNE_TEST -o $PRUNE_BENCH -o -name '*.cc' -print | sort | tr "\n" " "`
+PORTABLE_FILES=`find $DIRS $PRUNE_TEST -o $PRUNE_BENCH -o -name '*.cc' -not -name 'env_*.cc' -not -name '*_logger.cc' -print | sort | tr "\n" " "`
 set +f # re-enable globbing
 
 # The sources consist of the portable files, plus the platform-specific port
 # file.
-echo "SOURCES=$PORTABLE_FILES $PORT_FILE" >> $OUTPUT
+echo "SOURCES=$PORTABLE_FILES $PLATFORM_SOURCES" >> $OUTPUT
 echo "MEMENV_SOURCES=helpers/memenv/memenv.cc" >> $OUTPUT
 
 if [ "$CROSS_COMPILE" = "true" ]; then
@@ -173,6 +185,7 @@ echo "PLATFORM=$PLATFORM" >> $OUTPUT
 echo "PLATFORM_LDFLAGS=$PLATFORM_LDFLAGS" >> $OUTPUT
 echo "PLATFORM_CCFLAGS=$PLATFORM_CCFLAGS" >> $OUTPUT
 echo "PLATFORM_CXXFLAGS=$PLATFORM_CXXFLAGS" >> $OUTPUT
+echo "PLATFORM_EXTRALIBS=$PLATFORM_EXTRALIBS" >> $OUTPUT
 echo "PLATFORM_SHARED_CFLAGS=$PLATFORM_SHARED_CFLAGS" >> $OUTPUT
 echo "PLATFORM_SHARED_EXT=$PLATFORM_SHARED_EXT" >> $OUTPUT
 echo "PLATFORM_SHARED_LDFLAGS=$PLATFORM_SHARED_LDFLAGS" >> $OUTPUT
diff --git a/src/leveldb/port/port.h b/src/leveldb/port/port.h
index e667db40d0..4baafa8e22 100644
--- a/src/leveldb/port/port.h
+++ b/src/leveldb/port/port.h
@@ -14,6 +14,8 @@
 #  include "port/port_posix.h"
 #elif defined(LEVELDB_PLATFORM_CHROMIUM)
 #  include "port/port_chromium.h"
+#elif defined(LEVELDB_PLATFORM_WINDOWS)
+#  include "port/port_win.h"
 #endif
 
 #endif  // STORAGE_LEVELDB_PORT_PORT_H_
diff --git a/src/leveldb/port/port_win.cc b/src/leveldb/port/port_win.cc
new file mode 100644
index 0000000000..4ca64acbef
--- /dev/null
+++ b/src/leveldb/port/port_win.cc
@@ -0,0 +1,182 @@
+// LevelDB Copyright (c) 2011 The LevelDB Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file. See the AUTHORS file for names of contributors.
+//
+// See port_example.h for documentation for the following types/functions.
+
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are met:
+// 
+//  * Redistributions of source code must retain the above copyright
+//    notice, this list of conditions and the following disclaimer.
+//  * Redistributions in binary form must reproduce the above copyright
+//    notice, this list of conditions and the following disclaimer in the
+//    documentation and/or other materials provided with the distribution.
+//  * Neither the name of the University of California, Berkeley nor the
+//    names of its contributors may be used to endorse or promote products
+//    derived from this software without specific prior written permission.
+// 
+// THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND ANY
+// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+// DISCLAIMED. IN NO EVENT SHALL THE REGENTS AND CONTRIBUTORS BE LIABLE FOR ANY
+// DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+
+#include "port/port_win.h"
+
+#include <windows.h>
+#include <cassert>
+
+namespace leveldb {
+namespace port {
+
+Mutex::Mutex() :
+    mutex_(::CreateMutex(NULL, FALSE, NULL)) {
+  assert(mutex_);
+}
+
+Mutex::~Mutex() {
+  assert(mutex_);
+  ::CloseHandle(mutex_);
+}
+
+void Mutex::Lock() {
+  assert(mutex_);
+  ::WaitForSingleObject(mutex_, INFINITE);
+}
+
+void Mutex::Unlock() {
+  assert(mutex_);
+  ::ReleaseMutex(mutex_);
+}
+
+void Mutex::AssertHeld() {
+  assert(mutex_);
+  assert(1);
+}
+
+CondVar::CondVar(Mutex* mu) :
+    waiting_(0), 
+    mu_(mu), 
+    sema_(::CreateSemaphore(NULL, 0, 0x7fffffff, NULL)), 
+    event_(::CreateEvent(NULL, FALSE, FALSE, NULL)),
+    broadcasted_(false){
+  assert(mu_);
+}
+
+CondVar::~CondVar() {
+  ::CloseHandle(sema_);
+  ::CloseHandle(event_);
+}
+
+void CondVar::Wait() {
+  wait_mtx_.Lock();
+  ++waiting_;
+  assert(waiting_ > 0);
+  wait_mtx_.Unlock();
+
+  ::SignalObjectAndWait(mu_->mutex_, sema_, INFINITE, FALSE);
+
+  wait_mtx_.Lock();
+  bool last = broadcasted_ && (--waiting_ == 0);
+  assert(waiting_ >= 0);
+  wait_mtx_.Unlock();
+
+  // we leave this function with the mutex held
+  if (last)
+  {
+    ::SignalObjectAndWait(event_, mu_->mutex_, INFINITE, FALSE);
+  }
+  else
+  {
+    ::WaitForSingleObject(mu_->mutex_, INFINITE);
+  }
+}
+
+void CondVar::Signal() {
+  wait_mtx_.Lock();
+  bool waiters = waiting_ > 0;
+  wait_mtx_.Unlock();
+
+  if (waiters)
+  {
+    ::ReleaseSemaphore(sema_, 1, 0);
+  }
+}
+
+void CondVar::SignalAll() {
+  wait_mtx_.Lock();
+
+  broadcasted_ = (waiting_ > 0);
+
+  if (broadcasted_)
+  {
+      // release all
+    ::ReleaseSemaphore(sema_, waiting_, 0);
+    wait_mtx_.Unlock();
+    ::WaitForSingleObject(event_, INFINITE);
+    broadcasted_ = false;
+  }
+  else
+  {
+    wait_mtx_.Unlock();
+  }
+}
+
+AtomicPointer::AtomicPointer(void* v) {
+  Release_Store(v);
+}
+
+void* AtomicPointer::Acquire_Load() const {
+  void * p = nullptr;
+  InterlockedExchangePointer(&p, rep_);
+  return p;
+}
+
+void AtomicPointer::Release_Store(void* v) {
+  InterlockedExchangePointer(&rep_, v);
+}
+
+void* AtomicPointer::NoBarrier_Load() const {
+  return rep_;
+}
+
+void AtomicPointer::NoBarrier_Store(void* v) {
+  rep_ = v;
+}
+
+enum InitializationState
+{
+    Uninitialized = 0,
+    Running = 1,
+    Initialized = 2
+};
+
+void InitOnce(OnceType* once, void (*initializer)()) {
+
+  static_assert(Uninitialized == LEVELDB_ONCE_INIT, "Invalid uninitialized state value");
+
+  InitializationState state = static_cast<InitializationState>(InterlockedCompareExchange(once, Running, Uninitialized));
+
+  if (state == Uninitialized) {
+      initializer();
+      *once = Initialized;
+  }
+
+  if (state == Running) {
+      while(*once != Initialized) {
+          Sleep(0); // yield
+      }
+  }
+
+  assert(*once == Initialized);
+}
+
+}
+}
diff --git a/src/leveldb/port/port_win.h b/src/leveldb/port/port_win.h
new file mode 100644
index 0000000000..b53d6ef70d
--- /dev/null
+++ b/src/leveldb/port/port_win.h
@@ -0,0 +1,161 @@
+// LevelDB Copyright (c) 2011 The LevelDB Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file. See the AUTHORS file for names of contributors.
+//
+// See port_example.h for documentation for the following types/functions.
+
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are met:
+// 
+//  * Redistributions of source code must retain the above copyright
+//    notice, this list of conditions and the following disclaimer.
+//  * Redistributions in binary form must reproduce the above copyright
+//    notice, this list of conditions and the following disclaimer in the
+//    documentation and/or other materials provided with the distribution.
+//  * Neither the name of the University of California, Berkeley nor the
+//    names of its contributors may be used to endorse or promote products
+//    derived from this software without specific prior written permission.
+// 
+// THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND ANY
+// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+// DISCLAIMED. IN NO EVENT SHALL THE REGENTS AND CONTRIBUTORS BE LIABLE FOR ANY
+// DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+
+#ifndef STORAGE_LEVELDB_PORT_PORT_WIN_H_
+#define STORAGE_LEVELDB_PORT_PORT_WIN_H_
+
+#ifdef _MSC_VER
+#define snprintf _snprintf
+#define close _close
+#define fread_unlocked _fread_nolock
+#endif
+
+
+#ifdef SNAPPY
+#include <snappy/snappy.h>
+#endif
+
+#include <string>
+
+#include <stdint.h>
+
+namespace leveldb {
+namespace port {
+
+// Windows is little endian (for now :p)
+static const bool kLittleEndian = true;
+
+class CondVar;
+
+class Mutex {
+ public:
+  Mutex();
+  ~Mutex();
+
+  void Lock();
+  void Unlock();
+  void AssertHeld();
+
+ private:
+  friend class CondVar;
+  // critical sections are more efficient than mutexes
+  // but they are not recursive and can only be used to synchronize threads within the same process
+  // additionnaly they cannot be used with SignalObjectAndWait that we use for CondVar
+  // we use opaque void * to avoid including windows.h in port_win.h
+  void * mutex_;
+
+  // No copying
+  Mutex(const Mutex&);
+  void operator=(const Mutex&);
+};
+
+// the Win32 API offers a dependable condition variable mechanism, but only starting with
+// Windows 2008 and Vista
+// no matter what we will implement our own condition variable with a semaphore
+// implementation as described in a paper written by Douglas C. Schmidt and Irfan Pyarali
+class CondVar {
+ public:
+  explicit CondVar(Mutex* mu);
+  ~CondVar();
+  void Wait();
+  void Signal();
+  void SignalAll();
+ private:
+  Mutex* mu_;
+  
+  Mutex wait_mtx_;
+  long waiting_;
+  
+  void * sema_;
+  void * event_;
+
+  bool broadcasted_;  
+};
+
+// Storage for a lock-free pointer
+class AtomicPointer {
+ private:
+  void * rep_;
+ public:
+  AtomicPointer() : rep_(nullptr) { }
+  explicit AtomicPointer(void* v); 
+  void* Acquire_Load() const;
+
+  void Release_Store(void* v);
+
+  void* NoBarrier_Load() const;
+
+  void NoBarrier_Store(void* v);
+};
+
+typedef volatile long OnceType;
+#define LEVELDB_ONCE_INIT (0)
+
+extern void InitOnce(OnceType* once, void (*initializer)());
+
+inline bool Snappy_Compress(const char* input, size_t length,
+                            ::std::string* output) {
+#ifdef SNAPPY
+  output->resize(snappy::MaxCompressedLength(length));
+  size_t outlen;
+  snappy::RawCompress(input, length, &(*output)[0], &outlen);
+  output->resize(outlen);
+  return true;
+#endif
+
+  return false;
+}
+
+inline bool Snappy_GetUncompressedLength(const char* input, size_t length,
+                                         size_t* result) {
+#ifdef SNAPPY
+  return snappy::GetUncompressedLength(input, length, result);
+#else
+  return false;
+#endif
+}
+
+inline bool Snappy_Uncompress(const char* input, size_t length,
+                              char* output) {
+#ifdef SNAPPY
+  return snappy::RawUncompress(input, length, output);
+#else
+  return false;
+#endif
+}
+
+inline bool GetHeapProfile(void (*func)(void*, const char*, int), void* arg) {
+  return false;
+}
+
+}
+}
+
+#endif  // STORAGE_LEVELDB_PORT_PORT_WIN_H_
diff --git a/src/leveldb/util/env_boost.cc b/src/leveldb/util/env_boost.cc
new file mode 100644
index 0000000000..0190f9fb77
--- /dev/null
+++ b/src/leveldb/util/env_boost.cc
@@ -0,0 +1,591 @@
+// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file. See the AUTHORS file for names of contributors.
+
+#include <deque>
+
+#ifdef LEVELDB_PLATFORM_WINDOWS
+#include <windows.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <time.h>
+#include <io.h>
+#else
+#include <dirent.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <pthread.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/mman.h>
+#include <sys/stat.h>
+#include <sys/time.h>
+#include <sys/types.h>
+#include <sys/param.h>
+#include <time.h>
+#include <unistd.h>
+#endif
+#if defined(LEVELDB_PLATFORM_ANDROID)
+#include <sys/stat.h>
+#endif
+#include "leveldb/env.h"
+#include "leveldb/slice.h"
+
+#ifdef LEVELDB_PLATFORM_WINDOWS
+#include "util/win_logger.h"
+#else
+#include "util/posix_logger.h"
+#endif
+#include "port/port.h"
+#include "util/logging.h"
+
+#ifdef __linux
+#include <sys/sysinfo.h>
+#include <linux/unistd.h>
+#endif
+
+#include <fstream>
+
+// Boost includes - see WINDOWS file to see which modules to install
+#include <boost/date_time/gregorian/gregorian.hpp>
+#include <boost/date_time/posix_time/posix_time.hpp>
+#include <boost/filesystem/convenience.hpp>
+#include <boost/thread/once.hpp>
+#include <boost/thread/thread.hpp>
+#include <boost/bind.hpp>
+#include <boost/scoped_ptr.hpp>
+#include <boost/interprocess/sync/file_lock.hpp>
+#include <boost/thread/condition_variable.hpp>
+
+namespace leveldb {
+namespace {
+
+// returns the ID of the current process
+static boost::uint32_t current_process_id(void) {
+#ifdef _WIN32
+  return static_cast<boost::uint32_t>(::GetCurrentProcessId());
+#else
+  return static_cast<boost::uint32_t>(::getpid());
+#endif
+}
+
+// returns the ID of the current thread
+static boost::uint32_t current_thread_id(void) {
+#ifdef _WIN32
+  return static_cast<boost::uint32_t>(::GetCurrentThreadId());
+#else
+#ifdef __linux
+  return static_cast<boost::uint32_t>(::syscall(__NR_gettid));
+#else
+  // just return the pid
+  return current_process_id();
+#endif
+#endif
+}
+
+static char global_read_only_buf[0x8000];
+
+class PosixSequentialFile: public SequentialFile {
+ private:
+  std::string filename_;
+  FILE* file_;
+
+ public:
+  PosixSequentialFile(const std::string& fname, FILE* f)
+    : filename_(fname), file_(f) { }
+  virtual ~PosixSequentialFile() { fclose(file_); }
+
+  virtual Status Read(size_t n, Slice* result, char* scratch) {
+  Status s;
+#if defined(BSD) || defined(__MINGW32__)
+  // fread_unlocked doesn't exist on FreeBSD or MingW
+  size_t r = fread(scratch, 1, n, file_);
+#else
+  size_t r = fread_unlocked(scratch, 1, n, file_);
+#endif
+  *result = Slice(scratch, r);
+  if (r < n) {
+    if (feof(file_)) {
+    // We leave status as ok if we hit the end of the file
+    } else {
+    // A partial read with an error: return a non-ok status
+    s = Status::IOError(filename_, strerror(errno));
+    }
+  }
+  return s;
+  }
+
+  virtual Status Skip(uint64_t n) {
+  if (fseek(file_, n, SEEK_CUR)) {
+    return Status::IOError(filename_, strerror(errno));
+  }
+  return Status::OK();
+  }
+};
+
+class PosixRandomAccessFile: public RandomAccessFile {
+ private:
+  std::string filename_;
+  int fd_;
+  mutable boost::mutex mu_;
+
+ public:
+  PosixRandomAccessFile(const std::string& fname, int fd)
+    : filename_(fname), fd_(fd) { }
+  virtual ~PosixRandomAccessFile() { close(fd_); }
+
+  virtual Status Read(uint64_t offset, size_t n, Slice* result,
+            char* scratch) const {
+    Status s;
+#ifdef LEVELDB_PLATFORM_WINDOWS
+    // no pread on Windows so we emulate it with a mutex
+    boost::unique_lock<boost::mutex> lock(mu_);
+
+    if (::_lseeki64(fd_, offset, SEEK_SET) == -1L) {
+      return Status::IOError(filename_, strerror(errno));
+    }
+
+    int r = ::_read(fd_, scratch, n);
+    *result = Slice(scratch, (r < 0) ? 0 : r);
+    lock.unlock();
+#else
+    ssize_t r = pread(fd_, scratch, n, static_cast<off_t>(offset));
+    *result = Slice(scratch, (r < 0) ? 0 : r);
+#endif
+    if (r < 0) {
+      // An error: return a non-ok status
+      s = Status::IOError(filename_, strerror(errno));
+    }
+    return s;
+  }
+};
+
+// We preallocate up to an extra megabyte and use memcpy to append new
+// data to the file.  This is safe since we either properly close the
+// file before reading from it, or for log files, the reading code
+// knows enough to skip zero suffixes.
+
+class BoostFile : public WritableFile {
+
+public:
+  explicit BoostFile(std::string path) : path_(path), written_(0) {
+    Open();
+  }
+
+  virtual ~BoostFile() {
+    Close();
+  }
+
+private:
+  void Open() {
+    // we truncate the file as implemented in env_posix
+     file_.open(path_.generic_string().c_str(), 
+         std::ios_base::trunc | std::ios_base::out | std::ios_base::binary);
+     written_ = 0;
+  }
+
+public:
+  virtual Status Append(const Slice& data) {
+    Status result;
+    file_.write(data.data(), data.size());
+    if (!file_.good()) {
+      result = Status::IOError(
+          path_.generic_string() + " Append", "cannot write");
+    }
+    return result;
+  }
+
+  virtual Status Close() {
+    Status result;
+
+    try {
+      if (file_.is_open()) {
+        Sync();
+        file_.close();
+      }
+    } catch (const std::exception & e) {
+      result = Status::IOError(path_.generic_string() + " close", e.what());
+    }
+
+    return result;
+  }
+
+  virtual Status Flush() {
+    file_.flush();
+    return Status::OK();
+  }
+
+  virtual Status Sync() {
+    Status result;
+    try {
+      Flush();
+    } catch (const std::exception & e) {
+      result = Status::IOError(path_.string() + " sync", e.what());
+    }
+
+    return result;
+  }
+
+private:
+  boost::filesystem::path path_;
+  boost::uint64_t written_;
+  std::ofstream file_;
+};
+
+
+
+class BoostFileLock : public FileLock {
+ public:
+  boost::interprocess::file_lock fl_;
+};
+
+class PosixEnv : public Env {
+ public:
+  PosixEnv();
+  virtual ~PosixEnv() {
+    fprintf(stderr, "Destroying Env::Default()\n");
+    exit(1);
+  }
+
+  virtual Status NewSequentialFile(const std::string& fname,
+                   SequentialFile** result) {
+    FILE* f = fopen(fname.c_str(), "rb");
+    if (f == NULL) {
+      *result = NULL;
+      return Status::IOError(fname, strerror(errno));
+    } else {
+      *result = new PosixSequentialFile(fname, f);
+      return Status::OK();
+    }
+  }
+
+  virtual Status NewRandomAccessFile(const std::string& fname,
+                   RandomAccessFile** result) {
+#ifdef LEVELDB_PLATFORM_WINDOWS
+    int fd = _open(fname.c_str(), _O_RDONLY | _O_RANDOM | _O_BINARY);
+#else
+    int fd = open(fname.c_str(), O_RDONLY);
+#endif
+    if (fd < 0) {
+      *result = NULL;
+      return Status::IOError(fname, strerror(errno));
+    }
+    *result = new PosixRandomAccessFile(fname, fd);
+    return Status::OK();
+  }
+
+  virtual Status NewWritableFile(const std::string& fname,
+                 WritableFile** result) {
+    Status s;
+    try {
+      // will create a new empty file to write to
+      *result = new BoostFile(fname);
+    }
+    catch (const std::exception & e) {
+      s = Status::IOError(fname, e.what());
+    }
+
+    return s;
+  }
+
+  virtual bool FileExists(const std::string& fname) {
+    return boost::filesystem::exists(fname);
+  }
+
+  virtual Status GetChildren(const std::string& dir,
+               std::vector<std::string>* result) {
+    result->clear();
+
+    boost::system::error_code ec;
+    boost::filesystem::directory_iterator current(dir, ec);
+    if (ec != 0) {
+      return Status::IOError(dir, ec.message());
+    }
+
+    boost::filesystem::directory_iterator end;
+
+    for(; current != end; ++current) {
+      result->push_back(current->path().filename().generic_string());
+    }
+
+    return Status::OK();
+  }
+
+  virtual Status DeleteFile(const std::string& fname) {
+    boost::system::error_code ec;
+
+    boost::filesystem::remove(fname, ec);
+
+    Status result;
+
+    if (ec != 0) {
+      result = Status::IOError(fname, ec.message());
+    }
+
+    return result;
+  }
+
+  virtual Status CreateDir(const std::string& name) {
+      Status result;
+
+      if (boost::filesystem::exists(name) &&
+          boost::filesystem::is_directory(name)) {
+        return result;
+      }
+
+      boost::system::error_code ec;
+
+      if (!boost::filesystem::create_directories(name, ec)) {
+        result = Status::IOError(name, ec.message());
+      }
+
+      return result;
+    };
+
+    virtual Status DeleteDir(const std::string& name) {
+    Status result;
+
+    boost::system::error_code ec;
+    if (!boost::filesystem::remove_all(name, ec)) {
+      result = Status::IOError(name, ec.message());
+    }
+
+    return result;
+  };
+
+  virtual Status GetFileSize(const std::string& fname, uint64_t* size) {
+    boost::system::error_code ec;
+
+    Status result;
+
+    *size = static_cast<uint64_t>(boost::filesystem::file_size(fname, ec));
+    if (ec != 0) {
+      *size = 0;
+       result = Status::IOError(fname, ec.message());
+    }
+
+    return result;
+  }
+
+  virtual Status RenameFile(const std::string& src, const std::string& target) {
+    boost::system::error_code ec;
+
+    boost::filesystem::rename(src, target, ec);
+
+    Status result;
+
+    if (ec != 0) {
+      result = Status::IOError(src, ec.message());
+    }
+
+    return result;
+  }
+
+  virtual Status LockFile(const std::string& fname, FileLock** lock) {
+    *lock = NULL;
+
+    Status result;
+
+    try {
+      if (!boost::filesystem::exists(fname)) {
+        std::ofstream of(fname.c_str(), std::ios_base::trunc | std::ios_base::out);
+      }
+
+      assert(boost::filesystem::exists(fname));
+
+      boost::interprocess::file_lock fl(fname.c_str());
+      BoostFileLock * my_lock = new BoostFileLock();
+      my_lock->fl_ = std::move(fl);
+      if (!my_lock->fl_.try_lock()) {
+          return Status::IOError("database already in use: could not acquire exclusive lock");
+      }
+      *lock = my_lock;
+    } catch (const std::exception & e) {
+      result = Status::IOError("lock " + fname, e.what());
+    }
+
+    return result;
+  }
+
+  virtual Status UnlockFile(FileLock* lock) {
+
+    Status result;
+
+    try {
+      BoostFileLock * my_lock = static_cast<BoostFileLock *>(lock);
+      my_lock->fl_.unlock();
+      delete my_lock;
+    } catch (const std::exception & e) {
+      result = Status::IOError("unlock", e.what());
+    }
+
+    return result;
+  }
+
+  virtual void Schedule(void (*function)(void*), void* arg);
+
+  virtual void StartThread(void (*function)(void* arg), void* arg);
+
+  virtual Status GetTestDirectory(std::string* result) {
+    boost::system::error_code ec;
+    boost::filesystem::path temp_dir = 
+        boost::filesystem::temp_directory_path(ec);
+    if (ec != 0) {
+      temp_dir = "tmp";
+    }
+
+    temp_dir /= "leveldb_tests";
+    temp_dir /= boost::lexical_cast<std::string>(current_process_id());
+
+    // Directory may already exist
+    CreateDir(temp_dir.generic_string());
+
+    *result = temp_dir.generic_string();
+
+    return Status::OK();
+  }
+
+#ifndef LEVELDB_PLATFORM_WINDOWS
+  static uint64_t gettid() {
+    pthread_t tid = pthread_self();
+    uint64_t thread_id = 0;
+    memcpy(&thread_id, &tid, std::min(sizeof(thread_id), sizeof(tid)));
+    return thread_id;
+  }
+#endif
+
+  virtual Status NewLogger(const std::string& fname, Logger** result) {
+  FILE* f = fopen(fname.c_str(), "wt");
+  if (f == NULL) {
+    *result = NULL;
+    return Status::IOError(fname, strerror(errno));
+  } else {
+#ifdef LEVELDB_PLATFORM_WINDOWS
+    *result = new WinLogger(f);
+#else
+    *result = new PosixLogger(f, &PosixEnv::gettid);
+#endif
+    return Status::OK();
+  }
+  }
+
+  virtual uint64_t NowMicros() {
+    return static_cast<uint64_t>(
+        boost::posix_time::microsec_clock::universal_time()
+        .time_of_day().total_microseconds());
+  }
+
+  virtual void SleepForMicroseconds(int micros) {
+  boost::this_thread::sleep(boost::posix_time::microseconds(micros));
+  }
+
+ private:
+  void PthreadCall(const char* label, int result) {
+  if (result != 0) {
+    fprintf(stderr, "pthread %s: %s\n", label, strerror(result));
+    exit(1);
+  }
+  }
+
+  // BGThread() is the body of the background thread
+  void BGThread();
+
+  static void* BGThreadWrapper(void* arg) {
+    reinterpret_cast<PosixEnv*>(arg)->BGThread();
+    return NULL;
+  }
+
+  boost::mutex mu_;
+  boost::condition_variable bgsignal_;
+  boost::scoped_ptr<boost::thread> bgthread_;
+
+  // Entry per Schedule() call
+  struct BGItem { void* arg; void (*function)(void*); };
+  typedef std::deque<BGItem> BGQueue;
+  BGQueue queue_;
+};
+
+PosixEnv::PosixEnv() { }
+
+void PosixEnv::Schedule(void (*function)(void*), void* arg) {
+  boost::unique_lock<boost::mutex> lock(mu_);
+
+  // Start background thread if necessary
+  if (!bgthread_) {
+     bgthread_.reset(
+         new boost::thread(boost::bind(&PosixEnv::BGThreadWrapper, this)));
+  }
+
+  // Add to priority queue
+  queue_.push_back(BGItem());
+  queue_.back().function = function;
+  queue_.back().arg = arg;
+
+  lock.unlock();
+
+  bgsignal_.notify_one();
+
+}
+
+void PosixEnv::BGThread() {
+  while (true) {
+  // Wait until there is an item that is ready to run
+  boost::unique_lock<boost::mutex> lock(mu_);
+
+  while (queue_.empty()) {
+    bgsignal_.wait(lock);
+  }
+
+  void (*function)(void*) = queue_.front().function;
+  void* arg = queue_.front().arg;
+  queue_.pop_front();
+
+  lock.unlock();
+  (*function)(arg);
+  }
+}
+
+namespace {
+struct StartThreadState {
+  void (*user_function)(void*);
+  void* arg;
+};
+}
+
+static void* StartThreadWrapper(void* arg) {
+  StartThreadState* state = reinterpret_cast<StartThreadState*>(arg);
+  state->user_function(state->arg);
+  delete state;
+  return NULL;
+}
+
+void PosixEnv::StartThread(void (*function)(void* arg), void* arg) {
+  StartThreadState* state = new StartThreadState;
+  state->user_function = function;
+  state->arg = arg;
+
+  boost::thread t(boost::bind(&StartThreadWrapper, state));
+}
+
+}
+
+static boost::once_flag once = BOOST_ONCE_INIT;
+static Env* default_env;
+static void InitDefaultEnv() { 
+  ::memset(global_read_only_buf, 0, sizeof(global_read_only_buf));
+  default_env = new PosixEnv;
+}
+
+Env* Env::Default() {
+  boost::call_once(once, InitDefaultEnv);
+
+  return default_env;
+}
+
+}
diff --git a/src/leveldb/util/win_logger.cc b/src/leveldb/util/win_logger.cc
new file mode 100644
index 0000000000..834c98cc76
--- /dev/null
+++ b/src/leveldb/util/win_logger.cc
@@ -0,0 +1,96 @@
+// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file. See the AUTHORS file for names of contributors.
+
+#include "util/win_logger.h"
+
+#include <windows.h>
+
+namespace leveldb {
+
+void WinLogger::Logv(const char* format, va_list ap) {
+  const uint64_t thread_id = static_cast<uint64_t>(::GetCurrentThreadId());
+
+  // We try twice: the first time with a fixed-size stack allocated buffer,
+  // and the second time with a much larger dynamically allocated buffer.
+  char buffer[500];
+
+  for (int iter = 0; iter < 2; iter++) {
+    char* base;
+    int bufsize;
+    if (iter == 0) {
+      bufsize = sizeof(buffer);
+      base = buffer;
+    } else {
+      bufsize = 30000;
+      base = new char[bufsize];
+    }
+
+    char* p = base;
+    char* limit = base + bufsize;
+
+    SYSTEMTIME st;
+
+    // GetSystemTime returns UTC time, we want local time!
+    ::GetLocalTime(&st);
+
+#ifdef _MSC_VER
+    p += _snprintf_s(p, limit - p, _TRUNCATE,
+      "%04d/%02d/%02d-%02d:%02d:%02d.%03d %llx ",
+      st.wYear,
+      st.wMonth,
+      st.wDay,
+      st.wHour,
+      st.wMinute,
+      st.wSecond,
+      st.wMilliseconds,
+      static_cast<long long unsigned int>(thread_id));
+#else
+#ifdef __MINGW32__
+    p += snprintf(p, limit - p,
+      "%04d/%02d/%02d-%02d:%02d:%02d.%03d %llx ",
+      st.wYear,
+      st.wMonth,
+      st.wDay,
+      st.wHour,
+      st.wMinute,
+      st.wSecond,
+      st.wMilliseconds,
+      static_cast<long long unsigned int>(thread_id));
+#else
+#error Unable to detect Windows compiler (neither _MSC_VER nor __MINGW32__ are set)
+#endif
+#endif
+
+    // Print the message
+    if (p < limit) {
+      va_list backup_ap = ap;
+      p += vsnprintf(p, limit - p, format, backup_ap);
+      va_end(backup_ap);
+    }
+
+    // Truncate to available space if necessary
+    if (p >= limit) {
+      if (iter == 0) {
+        continue; // Try again with larger buffer
+      } else {
+        p = limit - 1;
+      }
+    }
+
+    // Add newline if necessary
+    if (p == base || p[-1] != '\n') {
+      *p++ = '\n';
+    }
+
+    assert(p <= limit);
+    fwrite(base, 1, p - base, file_);
+    fflush(file_);
+    if (base != buffer) {
+      delete[] base;
+    }
+    break;
+  }
+}
+
+}
\ No newline at end of file
diff --git a/src/leveldb/util/win_logger.h b/src/leveldb/util/win_logger.h
new file mode 100644
index 0000000000..b155d5c319
--- /dev/null
+++ b/src/leveldb/util/win_logger.h
@@ -0,0 +1,28 @@
+// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file. See the AUTHORS file for names of contributors.
+
+// Logger implementation for Windows
+
+#ifndef STORAGE_LEVELDB_UTIL_WIN_LOGGER_H_
+#define STORAGE_LEVELDB_UTIL_WIN_LOGGER_H_
+
+#include <stdio.h>
+#include "leveldb/env.h"
+
+namespace leveldb {
+
+class WinLogger : public Logger {
+ private:
+  FILE* file_;
+ public:
+  explicit WinLogger(FILE* f) : file_(f) { assert(file_); }
+  virtual ~WinLogger() {
+    fclose(file_);
+  }
+  virtual void Logv(const char* format, va_list ap);
+
+};
+
+}
+#endif  // STORAGE_LEVELDB_UTIL_WIN_LOGGER_H_