diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
new file mode 100644
index 0000000..cd600ff
--- /dev/null
+++ b/CONTRIBUTING.md
@@ -0,0 +1,36 @@
+# Contributing
+
+We'd love to accept your code patches! However, before we can take them, we
+have to jump a couple of legal hurdles.
+
+## Contributor License Agreements
+
+Please fill out either the individual or corporate Contributor License
+Agreement as appropriate.
+
+* If you are an individual writing original source code and you're sure you
+own the intellectual property, then sign an [individual CLA](https://developers.google.com/open-source/cla/individual).
+* If you work for a company that wants to allow you to contribute your work,
+then sign a [corporate CLA](https://developers.google.com/open-source/cla/corporate).
+
+Follow either of the two links above to access the appropriate CLA and
+instructions for how to sign and return it.
+
+## Submitting a Patch
+
+1. Sign the contributors license agreement above.
+2. Decide which code you want to submit. A submission should be a set of changes
+that addresses one issue in the [issue tracker](https://github.com/google/leveldb/issues).
+Please don't mix more than one logical change per submission, because it makes
+the history hard to follow. If you want to make a change
+(e.g. add a sample or feature) that doesn't have a corresponding issue in the
+issue tracker, please create one.
+3. **Submitting**: When you are ready to submit, send us a Pull Request. Be
+sure to include the issue number you fixed and the name you used to sign
+the CLA.
+
+## Writing Code ##
+
+If your contribution contains code, please make sure that it follows 
+[the style guide](http://google-styleguide.googlecode.com/svn/trunk/cppguide.xml).
+Otherwise we will have to ask you to make changes, and that's no fun for anyone.
diff --git a/Makefile b/Makefile
index f8903b6..2bd2cad 100644
--- a/Makefile
+++ b/Makefile
@@ -6,9 +6,12 @@
 # Uncomment exactly one of the lines labelled (A), (B), and (C) below
 # to switch between compilation modes.
 
-OPT ?= -O2 -DNDEBUG       # (A) Production use (optimized mode)
-# OPT ?= -g2              # (B) Debug mode, w/ full line-level debugging symbols
-# OPT ?= -O2 -g2 -DNDEBUG # (C) Profiling mode: opt, but w/debugging symbols
+# (A) Production use (optimized mode)
+OPT ?= -O2 -DNDEBUG
+# (B) Debug mode, w/ full line-level debugging symbols
+# OPT ?= -g2
+# (C) Profiling mode: opt, but w/debugging symbols
+# OPT ?= -O2 -g2 -DNDEBUG
 #-----------------------------------------------
 
 # detect what platform we're building on
@@ -29,6 +32,11 @@
 TESTUTIL = ./util/testutil.o
 TESTHARNESS = ./util/testharness.o $(TESTUTIL)
 
+# Note: iOS should probably be using libtool, not ar.
+ifeq ($(PLATFORM), IOS)
+AR=xcrun ar
+endif
+
 TESTS = \
 	arena_test \
 	autocompact_test \
@@ -43,6 +51,7 @@
 	env_test \
 	filename_test \
 	filter_block_test \
+	hash_test \
 	issue178_test \
 	issue200_test \
 	log_test \
@@ -72,7 +81,7 @@
 else
 # Update db.h if you change these.
 SHARED_MAJOR = 1
-SHARED_MINOR = 17
+SHARED_MINOR = 18
 SHARED1 = libleveldb.$(PLATFORM_SHARED_EXT)
 SHARED2 = $(SHARED1).$(SHARED_MAJOR)
 SHARED3 = $(SHARED1).$(SHARED_MAJOR).$(SHARED_MINOR)
@@ -152,6 +161,9 @@
 filter_block_test: table/filter_block_test.o $(LIBOBJECTS) $(TESTHARNESS)
 	$(CXX) $(LDFLAGS) table/filter_block_test.o $(LIBOBJECTS) $(TESTHARNESS) -o $@ $(LIBS)
 
+hash_test: util/hash_test.o $(LIBOBJECTS) $(TESTHARNESS)
+	$(CXX) $(LDFLAGS) util/hash_test.o $(LIBOBJECTS) $(TESTHARNESS) -o $@ $(LIBS)
+
 issue178_test: issues/issue178_test.o $(LIBOBJECTS) $(TESTHARNESS)
 	$(CXX) $(LDFLAGS) issues/issue178_test.o $(LIBOBJECTS) $(TESTHARNESS) -o $@ $(LIBS)
 
@@ -194,17 +206,17 @@
 
 .cc.o:
 	mkdir -p ios-x86/$(dir $@)
-	$(CXX) $(CXXFLAGS) -isysroot $(SIMULATORROOT)/SDKs/iPhoneSimulator$(IOSVERSION).sdk -arch i686 -arch x86_64 -c $< -o ios-x86/$@
+	xcrun -sdk iphonesimulator $(CXX) $(CXXFLAGS) -isysroot $(SIMULATORROOT)/SDKs/iPhoneSimulator$(IOSVERSION).sdk -arch i686 -arch x86_64 -c $< -o ios-x86/$@
 	mkdir -p ios-arm/$(dir $@)
 	xcrun -sdk iphoneos $(CXX) $(CXXFLAGS) -isysroot $(DEVICEROOT)/SDKs/iPhoneOS$(IOSVERSION).sdk $(IOSARCH) -c $< -o ios-arm/$@
-	lipo ios-x86/$@ ios-arm/$@ -create -output $@
+	xcrun lipo ios-x86/$@ ios-arm/$@ -create -output $@
 
 .c.o:
 	mkdir -p ios-x86/$(dir $@)
-	$(CC) $(CFLAGS) -isysroot $(SIMULATORROOT)/SDKs/iPhoneSimulator$(IOSVERSION).sdk -arch i686 -arch x86_64 -c $< -o ios-x86/$@
+	xcrun -sdk iphonesimulator $(CC) $(CFLAGS) -isysroot $(SIMULATORROOT)/SDKs/iPhoneSimulator$(IOSVERSION).sdk -arch i686 -arch x86_64 -c $< -o ios-x86/$@
 	mkdir -p ios-arm/$(dir $@)
 	xcrun -sdk iphoneos $(CC) $(CFLAGS) -isysroot $(DEVICEROOT)/SDKs/iPhoneOS$(IOSVERSION).sdk $(IOSARCH) -c $< -o ios-arm/$@
-	lipo ios-x86/$@ ios-arm/$@ -create -output $@
+	xcrun lipo ios-x86/$@ ios-arm/$@ -create -output $@
 
 else
 .cc.o:
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..480affb
--- /dev/null
+++ b/README.md
@@ -0,0 +1,138 @@
+**LevelDB is a fast key-value storage library written at Google that provides an ordered mapping from string keys to string values.**
+
+Authors: Sanjay Ghemawat (sanjay@google.com) and Jeff Dean (jeff@google.com)
+
+# Features
+  * Keys and values are arbitrary byte arrays.
+  * Data is stored sorted by key.
+  * Callers can provide a custom comparison function to override the sort order.
+  * The basic operations are `Put(key,value)`, `Get(key)`, `Delete(key)`.
+  * Multiple changes can be made in one atomic batch.
+  * Users can create a transient snapshot to get a consistent view of data.
+  * Forward and backward iteration is supported over the data.
+  * Data is automatically compressed using the [Snappy compression library](http://code.google.com/p/snappy).
+  * External activity (file system operations etc.) is relayed through a virtual interface so users can customize the operating system interactions.
+  * [Detailed documentation](http://htmlpreview.github.io/?https://github.com/google/leveldb/blob/master/doc/index.html) about how to use the library is included with the source code.
+
+
+# Limitations
+  * This is not a SQL database.  It does not have a relational data model, it does not support SQL queries, and it has no support for indexes.
+  * Only a single process (possibly multi-threaded) can access a particular database at a time.
+  * There is no client-server support builtin to the library.  An application that needs such support will have to wrap their own server around the library.
+
+# Performance
+
+Here is a performance report (with explanations) from the run of the
+included db_bench program.  The results are somewhat noisy, but should
+be enough to get a ballpark performance estimate.
+
+## Setup
+
+We use a database with a million entries.  Each entry has a 16 byte
+key, and a 100 byte value.  Values used by the benchmark compress to
+about half their original size.
+
+    LevelDB:    version 1.1
+    Date:       Sun May  1 12:11:26 2011
+    CPU:        4 x Intel(R) Core(TM)2 Quad CPU    Q6600  @ 2.40GHz
+    CPUCache:   4096 KB
+    Keys:       16 bytes each
+    Values:     100 bytes each (50 bytes after compression)
+    Entries:    1000000
+    Raw Size:   110.6 MB (estimated)
+    File Size:  62.9 MB (estimated)
+
+## Write performance
+
+The "fill" benchmarks create a brand new database, in either
+sequential, or random order.  The "fillsync" benchmark flushes data
+from the operating system to the disk after every operation; the other
+write operations leave the data sitting in the operating system buffer
+cache for a while.  The "overwrite" benchmark does random writes that
+update existing keys in the database.
+
+    fillseq      :       1.765 micros/op;   62.7 MB/s
+    fillsync     :     268.409 micros/op;    0.4 MB/s (10000 ops)
+    fillrandom   :       2.460 micros/op;   45.0 MB/s
+    overwrite    :       2.380 micros/op;   46.5 MB/s
+
+Each "op" above corresponds to a write of a single key/value pair.
+I.e., a random write benchmark goes at approximately 400,000 writes per second.
+
+Each "fillsync" operation costs much less (0.3 millisecond)
+than a disk seek (typically 10 milliseconds).  We suspect that this is
+because the hard disk itself is buffering the update in its memory and
+responding before the data has been written to the platter.  This may
+or may not be safe based on whether or not the hard disk has enough
+power to save its memory in the event of a power failure.
+
+## Read performance
+
+We list the performance of reading sequentially in both the forward
+and reverse direction, and also the performance of a random lookup.
+Note that the database created by the benchmark is quite small.
+Therefore the report characterizes the performance of leveldb when the
+working set fits in memory.  The cost of reading a piece of data that
+is not present in the operating system buffer cache will be dominated
+by the one or two disk seeks needed to fetch the data from disk.
+Write performance will be mostly unaffected by whether or not the
+working set fits in memory.
+
+    readrandom   :      16.677 micros/op;  (approximately 60,000 reads per second)
+    readseq      :       0.476 micros/op;  232.3 MB/s
+    readreverse  :       0.724 micros/op;  152.9 MB/s
+
+LevelDB compacts its underlying storage data in the background to
+improve read performance.  The results listed above were done
+immediately after a lot of random writes.  The results after
+compactions (which are usually triggered automatically) are better.
+
+    readrandom   :      11.602 micros/op;  (approximately 85,000 reads per second)
+    readseq      :       0.423 micros/op;  261.8 MB/s
+    readreverse  :       0.663 micros/op;  166.9 MB/s
+
+Some of the high cost of reads comes from repeated decompression of blocks
+read from disk.  If we supply enough cache to the leveldb so it can hold the
+uncompressed blocks in memory, the read performance improves again:
+
+    readrandom   :       9.775 micros/op;  (approximately 100,000 reads per second before compaction)
+    readrandom   :       5.215 micros/op;  (approximately 190,000 reads per second after compaction)
+
+## Repository contents
+
+See doc/index.html for more explanation. See doc/impl.html for a brief overview of the implementation.
+
+The public interface is in include/*.h.  Callers should not include or
+rely on the details of any other header files in this package.  Those
+internal APIs may be changed without warning.
+
+Guide to header files:
+
+* **include/db.h**: Main interface to the DB: Start here
+
+* **include/options.h**: Control over the behavior of an entire database,
+and also control over the behavior of individual reads and writes.
+
+* **include/comparator.h**: Abstraction for user-specified comparison function. 
+If you want just bytewise comparison of keys, you can use the default
+comparator, but clients can write their own comparator implementations if they
+want custom ordering (e.g. to handle different character encodings, etc.)
+
+* **include/iterator.h**: Interface for iterating over data. You can get
+an iterator from a DB object.
+
+* **include/write_batch.h**: Interface for atomically applying multiple
+updates to a database.
+
+* **include/slice.h**: A simple module for maintaining a pointer and a
+length into some other byte array.
+
+* **include/status.h**: Status is returned from many of the public interfaces
+and is used to report success and various kinds of errors.
+
+* **include/env.h**: 
+Abstraction of the OS environment.  A posix implementation of this interface is
+in util/env_posix.cc
+
+* **include/table.h, include/table_builder.h**: Lower-level modules that most
+clients probably won't use directly
diff --git a/build_detect_platform b/build_detect_platform
index 6e59c6f..bb76c4f 100755
--- a/build_detect_platform
+++ b/build_detect_platform
@@ -20,7 +20,7 @@
 #
 # The PLATFORM_CCFLAGS and PLATFORM_CXXFLAGS might include the following:
 #
-#       -DLEVELDB_CSTDATOMIC_PRESENT if <cstdatomic> is present
+#       -DLEVELDB_ATOMIC_PRESENT     if <atomic> is present
 #       -DLEVELDB_PLATFORM_POSIX     for Posix-based platforms
 #       -DSNAPPY                     if the Snappy library is present
 #
@@ -72,6 +72,12 @@
 fi
 
 case "$TARGET_OS" in
+    CYGWIN_*)
+        PLATFORM=OS_LINUX
+        COMMON_FLAGS="$MEMCMP_FLAG -lpthread -DOS_LINUX -DCYGWIN"
+        PLATFORM_LDFLAGS="-lpthread"
+        PORT_FILE=port/port_posix.cc
+        ;;
     Darwin)
         PLATFORM=OS_MACOSX
         COMMON_FLAGS="$MEMCMP_FLAG -DOS_MACOSX"
@@ -171,13 +177,14 @@
 else
     CXXOUTPUT="${TMPDIR}/leveldb_build_detect_platform-cxx.$$"
 
-    # If -std=c++0x works, use <cstdatomic>.  Otherwise use port_posix.h.
+    # If -std=c++0x works, use <atomic> as fallback for when memory barriers
+    # are not available.
     $CXX $CXXFLAGS -std=c++0x -x c++ - -o $CXXOUTPUT 2>/dev/null  <<EOF
-      #include <cstdatomic>
+      #include <atomic>
       int main() {}
 EOF
     if [ "$?" = 0 ]; then
-        COMMON_FLAGS="$COMMON_FLAGS -DLEVELDB_PLATFORM_POSIX -DLEVELDB_CSTDATOMIC_PRESENT"
+        COMMON_FLAGS="$COMMON_FLAGS -DLEVELDB_PLATFORM_POSIX -DLEVELDB_ATOMIC_PRESENT"
         PLATFORM_CXXFLAGS="-std=c++0x"
     else
         COMMON_FLAGS="$COMMON_FLAGS -DLEVELDB_PLATFORM_POSIX"
diff --git a/db/db_bench.cc b/db/db_bench.cc
index fc46d89..705a170 100644
--- a/db/db_bench.cc
+++ b/db/db_bench.cc
@@ -431,7 +431,7 @@
         benchmarks = sep + 1;
       }
 
-      // Reset parameters that may be overriddden bwlow
+      // Reset parameters that may be overridden below
       num_ = FLAGS_num;
       reads_ = (FLAGS_reads < 0 ? FLAGS_num : FLAGS_reads);
       value_size_ = FLAGS_value_size;
@@ -811,7 +811,6 @@
 
   void SeekRandom(ThreadState* thread) {
     ReadOptions options;
-    std::string value;
     int found = 0;
     for (int i = 0; i < reads_; i++) {
       Iterator* iter = db_->NewIterator(options);
diff --git a/db/db_impl.cc b/db/db_impl.cc
index faf5e7d..49b9595 100644
--- a/db/db_impl.cc
+++ b/db/db_impl.cc
@@ -392,7 +392,7 @@
   reporter.info_log = options_.info_log;
   reporter.fname = fname.c_str();
   reporter.status = (options_.paranoid_checks ? &status : NULL);
-  // We intentially make log::Reader do checksumming even if
+  // We intentionally make log::Reader do checksumming even if
   // paranoid_checks==false so that corruptions cause entire commits
   // to be skipped instead of propagating bad information (like overly
   // large sequence numbers).
@@ -1267,7 +1267,7 @@
         break;
       }
 
-      // Append to *reuslt
+      // Append to *result
       if (result == first->batch) {
         // Switch to temporary batch instead of disturbing caller's batch
         result = tmp_batch_;
diff --git a/db/db_test.cc b/db/db_test.cc
index 280b01c..0fed913 100644
--- a/db/db_test.cc
+++ b/db/db_test.cc
@@ -626,7 +626,7 @@
     //   * sstable B in level 2
     // Then do enough Get() calls to arrange for an automatic compaction
     // of sstable A.  A bug would cause the compaction to be marked as
-    // occuring at level 1 (instead of the correct level 0).
+    // occurring at level 1 (instead of the correct level 0).
 
     // Step 1: First place sstables in levels 0 and 2
     int compaction_count = 0;
diff --git a/db/dbformat.h b/db/dbformat.h
index 5d8a032..ea897b1 100644
--- a/db/dbformat.h
+++ b/db/dbformat.h
@@ -2,8 +2,8 @@
 // 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.
 
-#ifndef STORAGE_LEVELDB_DB_FORMAT_H_
-#define STORAGE_LEVELDB_DB_FORMAT_H_
+#ifndef STORAGE_LEVELDB_DB_DBFORMAT_H_
+#define STORAGE_LEVELDB_DB_DBFORMAT_H_
 
 #include <stdio.h>
 #include "leveldb/comparator.h"
@@ -227,4 +227,4 @@
 
 }  // namespace leveldb
 
-#endif  // STORAGE_LEVELDB_DB_FORMAT_H_
+#endif  // STORAGE_LEVELDB_DB_DBFORMAT_H_
diff --git a/db/dumpfile.cc b/db/dumpfile.cc
new file mode 100644
index 0000000..61c47c2
--- /dev/null
+++ b/db/dumpfile.cc
@@ -0,0 +1,225 @@
+// Copyright (c) 2012 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 <stdio.h>
+#include "db/dbformat.h"
+#include "db/filename.h"
+#include "db/log_reader.h"
+#include "db/version_edit.h"
+#include "db/write_batch_internal.h"
+#include "leveldb/env.h"
+#include "leveldb/iterator.h"
+#include "leveldb/options.h"
+#include "leveldb/status.h"
+#include "leveldb/table.h"
+#include "leveldb/write_batch.h"
+#include "util/logging.h"
+
+namespace leveldb {
+
+namespace {
+
+bool GuessType(const std::string& fname, FileType* type) {
+  size_t pos = fname.rfind('/');
+  std::string basename;
+  if (pos == std::string::npos) {
+    basename = fname;
+  } else {
+    basename = std::string(fname.data() + pos + 1, fname.size() - pos - 1);
+  }
+  uint64_t ignored;
+  return ParseFileName(basename, &ignored, type);
+}
+
+// Notified when log reader encounters corruption.
+class CorruptionReporter : public log::Reader::Reporter {
+ public:
+  WritableFile* dst_;
+  virtual void Corruption(size_t bytes, const Status& status) {
+    std::string r = "corruption: ";
+    AppendNumberTo(&r, bytes);
+    r += " bytes; ";
+    r += status.ToString();
+    r.push_back('\n');
+    dst_->Append(r);
+  }
+};
+
+// Print contents of a log file. (*func)() is called on every record.
+Status PrintLogContents(Env* env, const std::string& fname,
+                        void (*func)(uint64_t, Slice, WritableFile*),
+                        WritableFile* dst) {
+  SequentialFile* file;
+  Status s = env->NewSequentialFile(fname, &file);
+  if (!s.ok()) {
+    return s;
+  }
+  CorruptionReporter reporter;
+  reporter.dst_ = dst;
+  log::Reader reader(file, &reporter, true, 0);
+  Slice record;
+  std::string scratch;
+  while (reader.ReadRecord(&record, &scratch)) {
+    (*func)(reader.LastRecordOffset(), record, dst);
+  }
+  delete file;
+  return Status::OK();
+}
+
+// Called on every item found in a WriteBatch.
+class WriteBatchItemPrinter : public WriteBatch::Handler {
+ public:
+  WritableFile* dst_;
+  virtual void Put(const Slice& key, const Slice& value) {
+    std::string r = "  put '";
+    AppendEscapedStringTo(&r, key);
+    r += "' '";
+    AppendEscapedStringTo(&r, value);
+    r += "'\n";
+    dst_->Append(r);
+  }
+  virtual void Delete(const Slice& key) {
+    std::string r = "  del '";
+    AppendEscapedStringTo(&r, key);
+    r += "'\n";
+    dst_->Append(r);
+  }
+};
+
+
+// Called on every log record (each one of which is a WriteBatch)
+// found in a kLogFile.
+static void WriteBatchPrinter(uint64_t pos, Slice record, WritableFile* dst) {
+  std::string r = "--- offset ";
+  AppendNumberTo(&r, pos);
+  r += "; ";
+  if (record.size() < 12) {
+    r += "log record length ";
+    AppendNumberTo(&r, record.size());
+    r += " is too small\n";
+    dst->Append(r);
+    return;
+  }
+  WriteBatch batch;
+  WriteBatchInternal::SetContents(&batch, record);
+  r += "sequence ";
+  AppendNumberTo(&r, WriteBatchInternal::Sequence(&batch));
+  r.push_back('\n');
+  dst->Append(r);
+  WriteBatchItemPrinter batch_item_printer;
+  batch_item_printer.dst_ = dst;
+  Status s = batch.Iterate(&batch_item_printer);
+  if (!s.ok()) {
+    dst->Append("  error: " + s.ToString() + "\n");
+  }
+}
+
+Status DumpLog(Env* env, const std::string& fname, WritableFile* dst) {
+  return PrintLogContents(env, fname, WriteBatchPrinter, dst);
+}
+
+// Called on every log record (each one of which is a WriteBatch)
+// found in a kDescriptorFile.
+static void VersionEditPrinter(uint64_t pos, Slice record, WritableFile* dst) {
+  std::string r = "--- offset ";
+  AppendNumberTo(&r, pos);
+  r += "; ";
+  VersionEdit edit;
+  Status s = edit.DecodeFrom(record);
+  if (!s.ok()) {
+    r += s.ToString();
+    r.push_back('\n');
+  } else {
+    r += edit.DebugString();
+  }
+  dst->Append(r);
+}
+
+Status DumpDescriptor(Env* env, const std::string& fname, WritableFile* dst) {
+  return PrintLogContents(env, fname, VersionEditPrinter, dst);
+}
+
+Status DumpTable(Env* env, const std::string& fname, WritableFile* dst) {
+  uint64_t file_size;
+  RandomAccessFile* file = NULL;
+  Table* table = NULL;
+  Status s = env->GetFileSize(fname, &file_size);
+  if (s.ok()) {
+    s = env->NewRandomAccessFile(fname, &file);
+  }
+  if (s.ok()) {
+    // We use the default comparator, which may or may not match the
+    // comparator used in this database. However this should not cause
+    // problems since we only use Table operations that do not require
+    // any comparisons.  In particular, we do not call Seek or Prev.
+    s = Table::Open(Options(), file, file_size, &table);
+  }
+  if (!s.ok()) {
+    delete table;
+    delete file;
+    return s;
+  }
+
+  ReadOptions ro;
+  ro.fill_cache = false;
+  Iterator* iter = table->NewIterator(ro);
+  std::string r;
+  for (iter->SeekToFirst(); iter->Valid(); iter->Next()) {
+    r.clear();
+    ParsedInternalKey key;
+    if (!ParseInternalKey(iter->key(), &key)) {
+      r = "badkey '";
+      AppendEscapedStringTo(&r, iter->key());
+      r += "' => '";
+      AppendEscapedStringTo(&r, iter->value());
+      r += "'\n";
+      dst->Append(r);
+    } else {
+      r = "'";
+      AppendEscapedStringTo(&r, key.user_key);
+      r += "' @ ";
+      AppendNumberTo(&r, key.sequence);
+      r += " : ";
+      if (key.type == kTypeDeletion) {
+        r += "del";
+      } else if (key.type == kTypeValue) {
+        r += "val";
+      } else {
+        AppendNumberTo(&r, key.type);
+      }
+      r += " => '";
+      AppendEscapedStringTo(&r, iter->value());
+      r += "'\n";
+      dst->Append(r);
+    }
+  }
+  s = iter->status();
+  if (!s.ok()) {
+    dst->Append("iterator error: " + s.ToString() + "\n");
+  }
+
+  delete iter;
+  delete table;
+  delete file;
+  return Status::OK();
+}
+
+}  // namespace
+
+Status DumpFile(Env* env, const std::string& fname, WritableFile* dst) {
+  FileType ftype;
+  if (!GuessType(fname, &ftype)) {
+    return Status::InvalidArgument(fname + ": unknown file type");
+  }
+  switch (ftype) {
+    case kLogFile:         return DumpLog(env, fname, dst);
+    case kDescriptorFile:  return DumpDescriptor(env, fname, dst);
+    case kTableFile:       return DumpTable(env, fname, dst);
+    default:
+      break;
+  }
+  return Status::InvalidArgument(fname + ": not a dump-able file type");
+}
+
+}  // namespace leveldb
diff --git a/db/leveldb_main.cc b/db/leveldb_main.cc
index 995d761..9f4b7dd 100644
--- a/db/leveldb_main.cc
+++ b/db/leveldb_main.cc
@@ -3,212 +3,38 @@
 // found in the LICENSE file. See the AUTHORS file for names of contributors.
 
 #include <stdio.h>
-#include "db/dbformat.h"
-#include "db/filename.h"
-#include "db/log_reader.h"
-#include "db/version_edit.h"
-#include "db/write_batch_internal.h"
+#include "leveldb/dumpfile.h"
 #include "leveldb/env.h"
-#include "leveldb/iterator.h"
-#include "leveldb/options.h"
 #include "leveldb/status.h"
-#include "leveldb/table.h"
-#include "leveldb/write_batch.h"
-#include "util/logging.h"
 
 namespace leveldb {
-
 namespace {
 
-bool GuessType(const std::string& fname, FileType* type) {
-  size_t pos = fname.rfind('/');
-  std::string basename;
-  if (pos == std::string::npos) {
-    basename = fname;
-  } else {
-    basename = std::string(fname.data() + pos + 1, fname.size() - pos - 1);
-  }
-  uint64_t ignored;
-  return ParseFileName(basename, &ignored, type);
-}
-
-// Notified when log reader encounters corruption.
-class CorruptionReporter : public log::Reader::Reporter {
+class StdoutPrinter : public WritableFile {
  public:
-  virtual void Corruption(size_t bytes, const Status& status) {
-    printf("corruption: %d bytes; %s\n",
-            static_cast<int>(bytes),
-            status.ToString().c_str());
+  virtual Status Append(const Slice& data) {
+    fwrite(data.data(), 1, data.size(), stdout);
+    return Status::OK();
   }
+  virtual Status Close() { return Status::OK(); }
+  virtual Status Flush() { return Status::OK(); }
+  virtual Status Sync() { return Status::OK(); }
 };
 
-// Print contents of a log file. (*func)() is called on every record.
-bool PrintLogContents(Env* env, const std::string& fname,
-                      void (*func)(Slice)) {
-  SequentialFile* file;
-  Status s = env->NewSequentialFile(fname, &file);
-  if (!s.ok()) {
-    fprintf(stderr, "%s\n", s.ToString().c_str());
-    return false;
-  }
-  CorruptionReporter reporter;
-  log::Reader reader(file, &reporter, true, 0);
-  Slice record;
-  std::string scratch;
-  while (reader.ReadRecord(&record, &scratch)) {
-    printf("--- offset %llu; ",
-           static_cast<unsigned long long>(reader.LastRecordOffset()));
-    (*func)(record);
-  }
-  delete file;
-  return true;
-}
-
-// Called on every item found in a WriteBatch.
-class WriteBatchItemPrinter : public WriteBatch::Handler {
- public:
-  uint64_t offset_;
-  uint64_t sequence_;
-
-  virtual void Put(const Slice& key, const Slice& value) {
-    printf("  put '%s' '%s'\n",
-           EscapeString(key).c_str(),
-           EscapeString(value).c_str());
-  }
-  virtual void Delete(const Slice& key) {
-    printf("  del '%s'\n",
-           EscapeString(key).c_str());
-  }
-};
-
-
-// Called on every log record (each one of which is a WriteBatch)
-// found in a kLogFile.
-static void WriteBatchPrinter(Slice record) {
-  if (record.size() < 12) {
-    printf("log record length %d is too small\n",
-           static_cast<int>(record.size()));
-    return;
-  }
-  WriteBatch batch;
-  WriteBatchInternal::SetContents(&batch, record);
-  printf("sequence %llu\n",
-         static_cast<unsigned long long>(WriteBatchInternal::Sequence(&batch)));
-  WriteBatchItemPrinter batch_item_printer;
-  Status s = batch.Iterate(&batch_item_printer);
-  if (!s.ok()) {
-    printf("  error: %s\n", s.ToString().c_str());
-  }
-}
-
-bool DumpLog(Env* env, const std::string& fname) {
-  return PrintLogContents(env, fname, WriteBatchPrinter);
-}
-
-// Called on every log record (each one of which is a WriteBatch)
-// found in a kDescriptorFile.
-static void VersionEditPrinter(Slice record) {
-  VersionEdit edit;
-  Status s = edit.DecodeFrom(record);
-  if (!s.ok()) {
-    printf("%s\n", s.ToString().c_str());
-    return;
-  }
-  printf("%s", edit.DebugString().c_str());
-}
-
-bool DumpDescriptor(Env* env, const std::string& fname) {
-  return PrintLogContents(env, fname, VersionEditPrinter);
-}
-
-bool DumpTable(Env* env, const std::string& fname) {
-  uint64_t file_size;
-  RandomAccessFile* file = NULL;
-  Table* table = NULL;
-  Status s = env->GetFileSize(fname, &file_size);
-  if (s.ok()) {
-    s = env->NewRandomAccessFile(fname, &file);
-  }
-  if (s.ok()) {
-    // We use the default comparator, which may or may not match the
-    // comparator used in this database. However this should not cause
-    // problems since we only use Table operations that do not require
-    // any comparisons.  In particular, we do not call Seek or Prev.
-    s = Table::Open(Options(), file, file_size, &table);
-  }
-  if (!s.ok()) {
-    fprintf(stderr, "%s\n", s.ToString().c_str());
-    delete table;
-    delete file;
-    return false;
-  }
-
-  ReadOptions ro;
-  ro.fill_cache = false;
-  Iterator* iter = table->NewIterator(ro);
-  for (iter->SeekToFirst(); iter->Valid(); iter->Next()) {
-    ParsedInternalKey key;
-    if (!ParseInternalKey(iter->key(), &key)) {
-      printf("badkey '%s' => '%s'\n",
-             EscapeString(iter->key()).c_str(),
-             EscapeString(iter->value()).c_str());
-    } else {
-      char kbuf[20];
-      const char* type;
-      if (key.type == kTypeDeletion) {
-        type = "del";
-      } else if (key.type == kTypeValue) {
-        type = "val";
-      } else {
-        snprintf(kbuf, sizeof(kbuf), "%d", static_cast<int>(key.type));
-        type = kbuf;
-      }
-      printf("'%s' @ %8llu : %s => '%s'\n",
-             EscapeString(key.user_key).c_str(),
-             static_cast<unsigned long long>(key.sequence),
-             type,
-             EscapeString(iter->value()).c_str());
-    }
-  }
-  s = iter->status();
-  if (!s.ok()) {
-    printf("iterator error: %s\n", s.ToString().c_str());
-  }
-
-  delete iter;
-  delete table;
-  delete file;
-  return true;
-}
-
-bool DumpFile(Env* env, const std::string& fname) {
-  FileType ftype;
-  if (!GuessType(fname, &ftype)) {
-    fprintf(stderr, "%s: unknown file type\n", fname.c_str());
-    return false;
-  }
-  switch (ftype) {
-    case kLogFile:         return DumpLog(env, fname);
-    case kDescriptorFile:  return DumpDescriptor(env, fname);
-    case kTableFile:       return DumpTable(env, fname);
-
-    default: {
-      fprintf(stderr, "%s: not a dump-able file type\n", fname.c_str());
-      break;
-    }
-  }
-  return false;
-}
-
 bool HandleDumpCommand(Env* env, char** files, int num) {
+  StdoutPrinter printer;
   bool ok = true;
   for (int i = 0; i < num; i++) {
-    ok &= DumpFile(env, files[i]);
+    Status s = DumpFile(env, files[i], &printer);
+    if (!s.ok()) {
+      fprintf(stderr, "%s\n", s.ToString().c_str());
+      ok = false;
+    }
   }
   return ok;
 }
 
-}
+}  // namespace
 }  // namespace leveldb
 
 static void Usage() {
diff --git a/db/log_format.h b/db/log_format.h
index 2690cb9..a8c06ef 100644
--- a/db/log_format.h
+++ b/db/log_format.h
@@ -26,8 +26,8 @@
 
 static const int kBlockSize = 32768;
 
-// Header is checksum (4 bytes), type (1 byte), length (2 bytes).
-static const int kHeaderSize = 4 + 1 + 2;
+// Header is checksum (4 bytes), length (2 bytes), type (1 byte).
+static const int kHeaderSize = 4 + 2 + 1;
 
 }  // namespace log
 }  // namespace leveldb
diff --git a/db/log_reader.cc b/db/log_reader.cc
index 4919216..e44b66c 100644
--- a/db/log_reader.cc
+++ b/db/log_reader.cc
@@ -167,14 +167,14 @@
   return last_record_offset_;
 }
 
-void Reader::ReportCorruption(size_t bytes, const char* reason) {
+void Reader::ReportCorruption(uint64_t bytes, const char* reason) {
   ReportDrop(bytes, Status::Corruption(reason));
 }
 
-void Reader::ReportDrop(size_t bytes, const Status& reason) {
+void Reader::ReportDrop(uint64_t bytes, const Status& reason) {
   if (reporter_ != NULL &&
       end_of_buffer_offset_ - buffer_.size() - bytes >= initial_offset_) {
-    reporter_->Corruption(bytes, reason);
+    reporter_->Corruption(static_cast<size_t>(bytes), reason);
   }
 }
 
diff --git a/db/log_reader.h b/db/log_reader.h
index 82d4bee..6aff791 100644
--- a/db/log_reader.h
+++ b/db/log_reader.h
@@ -94,8 +94,8 @@
 
   // Reports dropped bytes to the reporter.
   // buffer_ must be updated to remove the dropped bytes prior to invocation.
-  void ReportCorruption(size_t bytes, const char* reason);
-  void ReportDrop(size_t bytes, const Status& reason);
+  void ReportCorruption(uint64_t bytes, const char* reason);
+  void ReportDrop(uint64_t bytes, const Status& reason);
 
   // No copying allowed
   Reader(const Reader&);
diff --git a/db/log_test.cc b/db/log_test.cc
index 91d3caa..dcf0562 100644
--- a/db/log_test.cc
+++ b/db/log_test.cc
@@ -463,7 +463,7 @@
 
   ASSERT_EQ("correct", Read());
   ASSERT_EQ("EOF", Read());
-  const int dropped = DroppedBytes();
+  const size_t dropped = DroppedBytes();
   ASSERT_LE(dropped, 2*kBlockSize + 100);
   ASSERT_GE(dropped, 2*kBlockSize);
 }
diff --git a/db/repair.cc b/db/repair.cc
index 7727faf..4cd4bb0 100644
--- a/db/repair.cc
+++ b/db/repair.cc
@@ -186,7 +186,7 @@
     reporter.env = env_;
     reporter.info_log = options_.info_log;
     reporter.lognum = log;
-    // We intentially make log::Reader do checksumming so that
+    // We intentionally make log::Reader do checksumming so that
     // corruptions cause entire commits to be skipped instead of
     // propagating bad information (like overly large sequence
     // numbers).
diff --git a/db/skiplist.h b/db/skiplist.h
index af85be6..ed8b092 100644
--- a/db/skiplist.h
+++ b/db/skiplist.h
@@ -1,3 +1,6 @@
+#ifndef STORAGE_LEVELDB_DB_SKIPLIST_H_
+#define STORAGE_LEVELDB_DB_SKIPLIST_H_
+
 // 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.
@@ -377,3 +380,5 @@
 }
 
 }  // namespace leveldb
+
+#endif  // STORAGE_LEVELDB_DB_SKIPLIST_H_
diff --git a/db/write_batch_internal.h b/db/write_batch_internal.h
index 4423a7f..310a3c8 100644
--- a/db/write_batch_internal.h
+++ b/db/write_batch_internal.h
@@ -21,10 +21,10 @@
   // Set the count for the number of entries in the batch.
   static void SetCount(WriteBatch* batch, int n);
 
-  // Return the seqeunce number for the start of this batch.
+  // Return the sequence number for the start of this batch.
   static SequenceNumber Sequence(const WriteBatch* batch);
 
-  // Store the specified number as the seqeunce number for the start of
+  // Store the specified number as the sequence number for the start of
   // this batch.
   static void SetSequence(WriteBatch* batch, SequenceNumber seq);
 
diff --git a/doc/bench/db_bench_tree_db.cc b/doc/bench/db_bench_tree_db.cc
index ed86f03..4ca381f 100644
--- a/doc/bench/db_bench_tree_db.cc
+++ b/doc/bench/db_bench_tree_db.cc
@@ -338,7 +338,7 @@
       bool write_sync = false;
       if (name == Slice("fillseq")) {
         Write(write_sync, SEQUENTIAL, FRESH, num_, FLAGS_value_size, 1);
-        
+        DBSynchronize(db_);
       } else if (name == Slice("fillrandom")) {
         Write(write_sync, RANDOM, FRESH, num_, FLAGS_value_size, 1);
         DBSynchronize(db_);
diff --git a/doc/impl.html b/doc/impl.html
index 28817fe..6a468be 100644
--- a/doc/impl.html
+++ b/doc/impl.html
@@ -111,7 +111,7 @@
 sequence of level-(L+1) files.  We switch to producing a new
 level-(L+1) file after the current output file has reached the target
 file size (2MB).  We also switch to a new output file when the key
-range of the current output file has grown enough to overlap more then
+range of the current output file has grown enough to overlap more than
 ten level-(L+2) files.  This last rule ensures that a later compaction
 of a level-(L+1) file will not pick up too much data from level-(L+2).
 
@@ -151,7 +151,7 @@
 If we throttle the background writing to something small, say 10% of
 the full 100MB/s speed, a compaction may take up to 5 seconds.  If the
 user is writing at 10MB/s, we might build up lots of level-0 files
-(~50 to hold the 5*10MB).  This may signficantly increase the cost of
+(~50 to hold the 5*10MB).  This may significantly increase the cost of
 reads due to the overhead of merging more files together on every
 read.
 
diff --git a/doc/log_format.txt b/doc/log_format.txt
index 5228f62..4cca5ef 100644
--- a/doc/log_format.txt
+++ b/doc/log_format.txt
@@ -11,7 +11,7 @@
 
 A record never starts within the last six bytes of a block (since it
 won't fit).  Any leftover bytes here form the trailer, which must
-consist entirely of zero bytes and must be skipped by readers.  
+consist entirely of zero bytes and must be skipped by readers.
 
 Aside: if exactly seven bytes are left in the current block, and a new
 non-zero length record is added, the writer must emit a FIRST record
@@ -33,8 +33,8 @@
 FIRST, MIDDLE, LAST are types used for user records that have been
 split into multiple fragments (typically because of block boundaries).
 FIRST is the type of the first fragment of a user record, LAST is the
-type of the last fragment of a user record, and MID is the type of all
-interior fragments of a user record.
+type of the last fragment of a user record, and MIDDLE is the type of
+all interior fragments of a user record.
 
 Example: consider a sequence of user records:
    A: length 1000
diff --git a/helpers/memenv/memenv.cc b/helpers/memenv/memenv.cc
index 5879de1..43ef2e0 100644
--- a/helpers/memenv/memenv.cc
+++ b/helpers/memenv/memenv.cc
@@ -55,14 +55,15 @@
     }
     const uint64_t available = size_ - offset;
     if (n > available) {
-      n = available;
+      n = static_cast<size_t>(available);
     }
     if (n == 0) {
       *result = Slice();
       return Status::OK();
     }
 
-    size_t block = offset / kBlockSize;
+    assert(offset / kBlockSize <= SIZE_MAX);
+    size_t block = static_cast<size_t>(offset / kBlockSize);
     size_t block_offset = offset % kBlockSize;
 
     if (n <= kBlockSize - block_offset) {
@@ -167,7 +168,7 @@
     if (pos_ > file_->Size()) {
       return Status::IOError("pos_ > file_->Size()");
     }
-    const size_t available = file_->Size() - pos_;
+    const uint64_t available = file_->Size() - pos_;
     if (n > available) {
       n = available;
     }
@@ -177,7 +178,7 @@
 
  private:
   FileState* file_;
-  size_t pos_;
+  uint64_t pos_;
 };
 
 class RandomAccessFileImpl : public RandomAccessFile {
diff --git a/include/leveldb/cache.h b/include/leveldb/cache.h
index 5e3b476..1a201e5 100644
--- a/include/leveldb/cache.h
+++ b/include/leveldb/cache.h
@@ -96,4 +96,4 @@
 
 }  // namespace leveldb
 
-#endif  // STORAGE_LEVELDB_UTIL_CACHE_H_
+#endif  // STORAGE_LEVELDB_INCLUDE_CACHE_H_
diff --git a/include/leveldb/db.h b/include/leveldb/db.h
index 40851b2..4c169bf 100644
--- a/include/leveldb/db.h
+++ b/include/leveldb/db.h
@@ -14,7 +14,7 @@
 
 // Update Makefile if you change these
 static const int kMajorVersion = 1;
-static const int kMinorVersion = 17;
+static const int kMinorVersion = 18;
 
 struct Options;
 struct ReadOptions;
diff --git a/include/leveldb/dumpfile.h b/include/leveldb/dumpfile.h
new file mode 100644
index 0000000..3f97fda
--- /dev/null
+++ b/include/leveldb/dumpfile.h
@@ -0,0 +1,25 @@
+// Copyright (c) 2014 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.
+
+#ifndef STORAGE_LEVELDB_INCLUDE_DUMPFILE_H_
+#define STORAGE_LEVELDB_INCLUDE_DUMPFILE_H_
+
+#include <string>
+#include "leveldb/env.h"
+#include "leveldb/status.h"
+
+namespace leveldb {
+
+// Dump the contents of the file named by fname in text format to
+// *dst.  Makes a sequence of dst->Append() calls; each call is passed
+// the newline-terminated text corresponding to a single item found
+// in the file.
+//
+// Returns a non-OK result if fname does not name a leveldb storage
+// file, or if the file cannot be read.
+Status DumpFile(Env* env, const std::string& fname, WritableFile* dst);
+
+}  // namespace leveldb
+
+#endif  // STORAGE_LEVELDB_INCLUDE_DUMPFILE_H_
diff --git a/include/leveldb/env.h b/include/leveldb/env.h
index b2072d0..f709514 100644
--- a/include/leveldb/env.h
+++ b/include/leveldb/env.h
@@ -142,7 +142,7 @@
   // useful for computing deltas of time.
   virtual uint64_t NowMicros() = 0;
 
-  // Sleep/delay the thread for the perscribed number of micro-seconds.
+  // Sleep/delay the thread for the prescribed number of micro-seconds.
   virtual void SleepForMicroseconds(int micros) = 0;
 
  private:
diff --git a/include/leveldb/iterator.h b/include/leveldb/iterator.h
index ad543eb..76aced0 100644
--- a/include/leveldb/iterator.h
+++ b/include/leveldb/iterator.h
@@ -61,7 +61,7 @@
   // Return the value for the current entry.  The underlying storage for
   // the returned slice is valid only until the next modification of
   // the iterator.
-  // REQUIRES: !AtEnd() && !AtStart()
+  // REQUIRES: Valid()
   virtual Slice value() const = 0;
 
   // If an error has occurred, return it.  Else return an ok status.
diff --git a/include/leveldb/options.h b/include/leveldb/options.h
index fdda718..7c9b973 100644
--- a/include/leveldb/options.h
+++ b/include/leveldb/options.h
@@ -153,7 +153,7 @@
 
   // If "snapshot" is non-NULL, read as of the supplied snapshot
   // (which must belong to the DB that is being read and which must
-  // not have been released).  If "snapshot" is NULL, use an impliicit
+  // not have been released).  If "snapshot" is NULL, use an implicit
   // snapshot of the state at the beginning of this read operation.
   // Default: NULL
   const Snapshot* snapshot;
diff --git a/port/atomic_pointer.h b/port/atomic_pointer.h
index a9866b2..9bf091f 100644
--- a/port/atomic_pointer.h
+++ b/port/atomic_pointer.h
@@ -5,14 +5,13 @@
 // AtomicPointer provides storage for a lock-free pointer.
 // Platform-dependent implementation of AtomicPointer:
 // - If the platform provides a cheap barrier, we use it with raw pointers
-// - If cstdatomic is present (on newer versions of gcc, it is), we use
-//   a cstdatomic-based AtomicPointer.  However we prefer the memory
+// - If <atomic> is present (on newer versions of gcc, it is), we use
+//   a <atomic>-based AtomicPointer.  However we prefer the memory
 //   barrier based version, because at least on a gcc 4.4 32-bit build
-//   on linux, we have encountered a buggy <cstdatomic>
-//   implementation.  Also, some <cstdatomic> implementations are much
-//   slower than a memory-barrier based implementation (~16ns for
-//   <cstdatomic> based acquire-load vs. ~1ns for a barrier based
-//   acquire-load).
+//   on linux, we have encountered a buggy <atomic> implementation.
+//   Also, some <atomic> implementations are much slower than a memory-barrier
+//   based implementation (~16ns for <atomic> based acquire-load vs. ~1ns for
+//   a barrier based acquire-load).
 // This code is based on atomicops-internals-* in Google's perftools:
 // http://code.google.com/p/google-perftools/source/browse/#svn%2Ftrunk%2Fsrc%2Fbase
 
@@ -20,8 +19,8 @@
 #define PORT_ATOMIC_POINTER_H_
 
 #include <stdint.h>
-#ifdef LEVELDB_CSTDATOMIC_PRESENT
-#include <cstdatomic>
+#ifdef LEVELDB_ATOMIC_PRESENT
+#include <atomic>
 #endif
 #ifdef OS_WIN
 #include <windows.h>
@@ -126,7 +125,7 @@
 };
 
 // AtomicPointer based on <cstdatomic>
-#elif defined(LEVELDB_CSTDATOMIC_PRESENT)
+#elif defined(LEVELDB_ATOMIC_PRESENT)
 class AtomicPointer {
  private:
   std::atomic<void*> rep_;
@@ -207,7 +206,7 @@
   inline void NoBarrier_Store(void* v) { rep_ = v; }
 };
 
-// We have neither MemoryBarrier(), nor <cstdatomic>
+// We have neither MemoryBarrier(), nor <atomic>
 #else
 #error Please implement AtomicPointer for this platform.
 
diff --git a/port/port_posix.h b/port/port_posix.h
index f2b89bf..89fc222 100644
--- a/port/port_posix.h
+++ b/port/port_posix.h
@@ -21,14 +21,11 @@
   #else
     #define PLATFORM_IS_LITTLE_ENDIAN false
   #endif
-#elif defined(OS_FREEBSD)
+#elif defined(OS_FREEBSD) || defined(OS_OPENBSD) ||\
+      defined(OS_NETBSD) || defined(OS_DRAGONFLYBSD)
   #include <sys/types.h>
   #include <sys/endian.h>
   #define PLATFORM_IS_LITTLE_ENDIAN (_BYTE_ORDER == _LITTLE_ENDIAN)
-#elif defined(OS_OPENBSD) || defined(OS_NETBSD) ||\
-      defined(OS_DRAGONFLYBSD)
-  #include <sys/types.h>
-  #include <sys/endian.h>
 #elif defined(OS_HPUX)
   #define PLATFORM_IS_LITTLE_ENDIAN false
 #elif defined(OS_ANDROID)
@@ -55,7 +52,7 @@
 
 #if defined(OS_MACOSX) || defined(OS_SOLARIS) || defined(OS_FREEBSD) ||\
     defined(OS_NETBSD) || defined(OS_OPENBSD) || defined(OS_DRAGONFLYBSD) ||\
-    defined(OS_ANDROID) || defined(OS_HPUX)
+    defined(OS_ANDROID) || defined(OS_HPUX) || defined(CYGWIN)
 // Use fread/fwrite/fflush on platforms without _unlocked variants
 #define fread_unlocked fread
 #define fwrite_unlocked fwrite
diff --git a/port/thread_annotations.h b/port/thread_annotations.h
index 6f9b6a7..9470ef5 100644
--- a/port/thread_annotations.h
+++ b/port/thread_annotations.h
@@ -2,7 +2,8 @@
 // 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.
 
-#ifndef STORAGE_LEVELDB_PORT_THREAD_ANNOTATIONS_H
+#ifndef STORAGE_LEVELDB_PORT_THREAD_ANNOTATIONS_H_
+#define STORAGE_LEVELDB_PORT_THREAD_ANNOTATIONS_H_
 
 // Some environments provide custom macros to aid in static thread-safety
 // analysis.  Provide empty definitions of such macros unless they are already
@@ -56,4 +57,4 @@
 #define NO_THREAD_SAFETY_ANALYSIS
 #endif
 
-#endif  // STORAGE_LEVELDB_PORT_THREAD_ANNOTATIONS_H
+#endif  // STORAGE_LEVELDB_PORT_THREAD_ANNOTATIONS_H_
diff --git a/table/block.cc b/table/block.cc
index 79ea9d9..43e402c 100644
--- a/table/block.cc
+++ b/table/block.cc
@@ -46,7 +46,7 @@
 // Helper routine: decode the next block entry starting at "p",
 // storing the number of shared key bytes, non_shared key bytes,
 // and the length of the value in "*shared", "*non_shared", and
-// "*value_length", respectively.  Will not derefence past "limit".
+// "*value_length", respectively.  Will not dereference past "limit".
 //
 // If any errors are detected, returns NULL.  Otherwise, returns a
 // pointer to the key delta (just past the three decoded values).
diff --git a/table/block_builder.h b/table/block_builder.h
index 5b545bd..4fbcb33 100644
--- a/table/block_builder.h
+++ b/table/block_builder.h
@@ -21,7 +21,7 @@
   // Reset the contents as if the BlockBuilder was just constructed.
   void Reset();
 
-  // REQUIRES: Finish() has not been callled since the last call to Reset().
+  // REQUIRES: Finish() has not been called since the last call to Reset().
   // REQUIRES: key is larger than any previously added key
   void Add(const Slice& key, const Slice& value);
 
diff --git a/table/format.cc b/table/format.cc
index cda1dec..aa63144 100644
--- a/table/format.cc
+++ b/table/format.cc
@@ -48,7 +48,7 @@
   const uint64_t magic = ((static_cast<uint64_t>(magic_hi) << 32) |
                           (static_cast<uint64_t>(magic_lo)));
   if (magic != kTableMagicNumber) {
-    return Status::InvalidArgument("not an sstable (bad magic number)");
+    return Status::Corruption("not an sstable (bad magic number)");
   }
 
   Status result = metaindex_handle_.DecodeFrom(input);
diff --git a/table/table.cc b/table/table.cc
index 71c1756..dff8a82 100644
--- a/table/table.cc
+++ b/table/table.cc
@@ -41,7 +41,7 @@
                    Table** table) {
   *table = NULL;
   if (size < Footer::kEncodedLength) {
-    return Status::InvalidArgument("file is too short to be an sstable");
+    return Status::Corruption("file is too short to be an sstable");
   }
 
   char footer_space[Footer::kEncodedLength];
@@ -58,7 +58,11 @@
   BlockContents contents;
   Block* index_block = NULL;
   if (s.ok()) {
-    s = ReadBlock(file, ReadOptions(), footer.index_handle(), &contents);
+    ReadOptions opt;
+    if (options.paranoid_checks) {
+      opt.verify_checksums = true;
+    }
+    s = ReadBlock(file, opt, footer.index_handle(), &contents);
     if (s.ok()) {
       index_block = new Block(contents);
     }
@@ -92,6 +96,9 @@
   // TODO(sanjay): Skip this if footer.metaindex_handle() size indicates
   // it is an empty block.
   ReadOptions opt;
+  if (rep_->options.paranoid_checks) {
+    opt.verify_checksums = true;
+  }
   BlockContents contents;
   if (!ReadBlock(rep_->file, opt, footer.metaindex_handle(), &contents).ok()) {
     // Do not propagate errors since meta info is not needed for operation
@@ -120,6 +127,9 @@
   // We might want to unify with ReadBlock() if we start
   // requiring checksum verification in Table::Open.
   ReadOptions opt;
+  if (rep_->options.paranoid_checks) {
+    opt.verify_checksums = true;
+  }
   BlockContents block;
   if (!ReadBlock(rep_->file, opt, filter_handle, &block).ok()) {
     return;
diff --git a/util/bloom.cc b/util/bloom.cc
index d7941cd..a27a2ac 100644
--- a/util/bloom.cc
+++ b/util/bloom.cc
@@ -29,7 +29,7 @@
   }
 
   virtual const char* Name() const {
-    return "leveldb.BuiltinBloomFilter";
+    return "leveldb.BuiltinBloomFilter2";
   }
 
   virtual void CreateFilter(const Slice* keys, int n, std::string* dst) const {
diff --git a/util/env_posix.cc b/util/env_posix.cc
index e1cbebd..ad56131 100644
--- a/util/env_posix.cc
+++ b/util/env_posix.cc
@@ -2,8 +2,6 @@
 // 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>
-#include <set>
 #include <dirent.h>
 #include <errno.h>
 #include <fcntl.h>
@@ -17,9 +15,8 @@
 #include <sys/types.h>
 #include <time.h>
 #include <unistd.h>
-#if defined(LEVELDB_PLATFORM_ANDROID)
-#include <sys/stat.h>
-#endif
+#include <deque>
+#include <set>
 #include "leveldb/env.h"
 #include "leveldb/slice.h"
 #include "port/port.h"
@@ -295,7 +292,8 @@
  public:
   PosixEnv();
   virtual ~PosixEnv() {
-    fprintf(stderr, "Destroying Env::Default()\n");
+    char msg[] = "Destroying Env::Default()\n";
+    fwrite(msg, 1, sizeof(msg), stderr);
     abort();
   }
 
diff --git a/util/hash.cc b/util/hash.cc
index 07cf022..ed439ce 100644
--- a/util/hash.cc
+++ b/util/hash.cc
@@ -34,13 +34,13 @@
   // Pick up remaining bytes
   switch (limit - data) {
     case 3:
-      h += data[2] << 16;
+      h += static_cast<unsigned char>(data[2]) << 16;
       FALLTHROUGH_INTENDED;
     case 2:
-      h += data[1] << 8;
+      h += static_cast<unsigned char>(data[1]) << 8;
       FALLTHROUGH_INTENDED;
     case 1:
-      h += data[0];
+      h += static_cast<unsigned char>(data[0]);
       h *= m;
       h ^= (h >> r);
       break;
diff --git a/util/hash_test.cc b/util/hash_test.cc
new file mode 100644
index 0000000..eaa1c92
--- /dev/null
+++ b/util/hash_test.cc
@@ -0,0 +1,54 @@
+// 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/hash.h"
+#include "util/testharness.h"
+
+namespace leveldb {
+
+class HASH { };
+
+TEST(HASH, SignedUnsignedIssue) {
+  const unsigned char data1[1] = {0x62};
+  const unsigned char data2[2] = {0xc3, 0x97};
+  const unsigned char data3[3] = {0xe2, 0x99, 0xa5};
+  const unsigned char data4[4] = {0xe1, 0x80, 0xb9, 0x32};
+  const unsigned char data5[48] = {
+    0x01, 0xc0, 0x00, 0x00,
+    0x00, 0x00, 0x00, 0x00,
+    0x00, 0x00, 0x00, 0x00,
+    0x00, 0x00, 0x00, 0x00,
+    0x14, 0x00, 0x00, 0x00,
+    0x00, 0x00, 0x04, 0x00,
+    0x00, 0x00, 0x00, 0x14,
+    0x00, 0x00, 0x00, 0x18,
+    0x28, 0x00, 0x00, 0x00,
+    0x00, 0x00, 0x00, 0x00,
+    0x02, 0x00, 0x00, 0x00,
+    0x00, 0x00, 0x00, 0x00,
+  };
+
+  ASSERT_EQ(Hash(0, 0, 0xbc9f1d34), 0xbc9f1d34);
+  ASSERT_EQ(
+      Hash(reinterpret_cast<const char*>(data1), sizeof(data1), 0xbc9f1d34),
+      0xef1345c4);
+  ASSERT_EQ(
+      Hash(reinterpret_cast<const char*>(data2), sizeof(data2), 0xbc9f1d34),
+      0x5b663814);
+  ASSERT_EQ(
+      Hash(reinterpret_cast<const char*>(data3), sizeof(data3), 0xbc9f1d34),
+      0x323c078f);
+  ASSERT_EQ(
+      Hash(reinterpret_cast<const char*>(data4), sizeof(data4), 0xbc9f1d34),
+      0xed21633a);
+  ASSERT_EQ(
+      Hash(reinterpret_cast<const char*>(data5), sizeof(data5), 0x12345678),
+      0xf333dabb);
+}
+
+}  // namespace leveldb
+
+int main(int argc, char** argv) {
+  return leveldb::test::RunAllTests();
+}
diff --git a/util/logging.cc b/util/logging.cc
index 22cf278..ca6b324 100644
--- a/util/logging.cc
+++ b/util/logging.cc
@@ -45,15 +45,6 @@
   return r;
 }
 
-bool ConsumeChar(Slice* in, char c) {
-  if (!in->empty() && (*in)[0] == c) {
-    in->remove_prefix(1);
-    return true;
-  } else {
-    return false;
-  }
-}
-
 bool ConsumeDecimalNumber(Slice* in, uint64_t* val) {
   uint64_t v = 0;
   int digits = 0;
diff --git a/util/logging.h b/util/logging.h
index b0c5da8..1b450d2 100644
--- a/util/logging.h
+++ b/util/logging.h
@@ -32,10 +32,6 @@
 // Escapes any non-printable characters found in "value".
 extern std::string EscapeString(const Slice& value);
 
-// If *in starts with "c", advances *in past the first character and
-// returns true.  Otherwise, returns false.
-extern bool ConsumeChar(Slice* in, char c);
-
 // Parse a human-readable number from "*in" into *value.  On success,
 // advances "*in" past the consumed number and sets "*val" to the
 // numeric value.  Otherwise, returns false and leaves *in in an