Merge branch 'develop'

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diff --git a/app/snappy/snappy-test.h b/app/snappy/snappy-test.h
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+// Copyright 2011 Google Inc. All Rights Reserved.
+//
+// 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 Google Inc. 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 COPYRIGHT HOLDERS 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 COPYRIGHT
+// OWNER OR 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.
+//
+// Various stubs for the unit tests for the open-source version of Snappy.
+
+#ifndef UTIL_SNAPPY_OPENSOURCE_SNAPPY_TEST_H_
+#define UTIL_SNAPPY_OPENSOURCE_SNAPPY_TEST_H_
+
+#include <iostream>
+#include <string>
+
+#include "snappy-stubs-internal.h"
+
+#include <stdio.h>
+#include <stdarg.h>
+
+#ifdef HAVE_SYS_MMAN_H
+#include <sys/mman.h>
+#endif
+
+#ifdef HAVE_SYS_RESOURCE_H
+#include <sys/resource.h>
+#endif
+
+#ifdef HAVE_SYS_TIME_H
+#include <sys/time.h>
+#endif
+
+#ifdef HAVE_WINDOWS_H
+#define WIN32_LEAN_AND_MEAN
+#include <windows.h>
+#endif
+
+#include <string>
+
+#ifdef HAVE_GTEST
+
+#include <gtest/gtest.h>
+#undef TYPED_TEST
+#define TYPED_TEST TEST
+#define INIT_GTEST(argc, argv) ::testing::InitGoogleTest(argc, *argv)
+
+#else
+
+// Stubs for if the user doesn't have Google Test installed.
+
+#define TEST(test_case, test_subcase) \
+  void Test_ ## test_case ## _ ## test_subcase()
+#define INIT_GTEST(argc, argv)
+
+#define TYPED_TEST TEST
+#define EXPECT_EQ CHECK_EQ
+#define EXPECT_NE CHECK_NE
+#define EXPECT_FALSE(cond) CHECK(!(cond))
+
+#endif
+
+#ifdef HAVE_GFLAGS
+
+#include <gflags/gflags.h>
+
+// This is tricky; both gflags and Google Test want to look at the command line
+// arguments. Google Test seems to be the most happy with unknown arguments,
+// though, so we call it first and hope for the best.
+#define InitGoogle(argv0, argc, argv, remove_flags) \
+  INIT_GTEST(argc, argv); \
+  google::ParseCommandLineFlags(argc, argv, remove_flags);
+
+#else
+
+// If we don't have the gflags package installed, these can only be
+// changed at compile time.
+#define DEFINE_int32(flag_name, default_value, description) \
+  static int FLAGS_ ## flag_name = default_value;
+
+#define InitGoogle(argv0, argc, argv, remove_flags) \
+  INIT_GTEST(argc, argv)
+
+#endif
+
+#ifdef HAVE_LIBZ
+#include "zlib.h"
+#endif
+
+#ifdef HAVE_LIBLZO2
+#include "lzo/lzo1x.h"
+#endif
+
+#ifdef HAVE_LIBLZF
+extern "C" {
+#include "lzf.h"
+}
+#endif
+
+#ifdef HAVE_LIBFASTLZ
+#include "fastlz.h"
+#endif
+
+#ifdef HAVE_LIBQUICKLZ
+#include "quicklz.h"
+#endif
+
+namespace {
+
+namespace File {
+  void Init() { }
+}  // namespace File
+
+namespace file {
+  int Defaults() { }
+
+  class DummyStatus {
+   public:
+    void CheckSuccess() { }
+  };
+
+  DummyStatus GetContents(const string& filename, string* data, int unused) {
+    FILE* fp = fopen(filename.c_str(), "rb");
+    if (fp == NULL) {
+      perror(filename.c_str());
+      exit(1);
+    }
+
+    data->clear();
+    while (!feof(fp)) {
+      char buf[4096];
+      size_t ret = fread(buf, 1, 4096, fp);
+      if (ret == 0 && ferror(fp)) {
+        perror("fread");
+        exit(1);
+      }
+      data->append(string(buf, ret));
+    }
+
+    fclose(fp);
+  }
+
+  DummyStatus SetContents(const string& filename,
+                          const string& str,
+                          int unused) {
+    FILE* fp = fopen(filename.c_str(), "wb");
+    if (fp == NULL) {
+      perror(filename.c_str());
+      exit(1);
+    }
+
+    int ret = fwrite(str.data(), str.size(), 1, fp);
+    if (ret != 1) {
+      perror("fwrite");
+      exit(1);
+    }
+
+    fclose(fp);
+  }
+}  // namespace file
+
+}  // namespace
+
+namespace snappy {
+
+#define FLAGS_test_random_seed 301
+typedef string TypeParam;
+
+void Test_CorruptedTest_VerifyCorrupted();
+void Test_Snappy_SimpleTests();
+void Test_Snappy_MaxBlowup();
+void Test_Snappy_RandomData();
+void Test_Snappy_FourByteOffset();
+void Test_SnappyCorruption_TruncatedVarint();
+void Test_SnappyCorruption_UnterminatedVarint();
+void Test_Snappy_ReadPastEndOfBuffer();
+void Test_Snappy_FindMatchLength();
+void Test_Snappy_FindMatchLengthRandom();
+
+string ReadTestDataFile(const string& base, size_t size_limit);
+
+string ReadTestDataFile(const string& base);
+
+// A sprintf() variant that returns a std::string.
+// Not safe for general use due to truncation issues.
+string StringPrintf(const char* format, ...);
+
+// A simple, non-cryptographically-secure random generator.
+class ACMRandom {
+ public:
+  explicit ACMRandom(uint32 seed) : seed_(seed) {}
+
+  int32 Next();
+
+  int32 Uniform(int32 n) {
+    return Next() % n;
+  }
+  uint8 Rand8() {
+    return static_cast<uint8>((Next() >> 1) & 0x000000ff);
+  }
+  bool OneIn(int X) { return Uniform(X) == 0; }
+
+  // Skewed: pick "base" uniformly from range [0,max_log] and then
+  // return "base" random bits.  The effect is to pick a number in the
+  // range [0,2^max_log-1] with bias towards smaller numbers.
+  int32 Skewed(int max_log);
+
+ private:
+  static const uint32 M = 2147483647L;   // 2^31-1
+  uint32 seed_;
+};
+
+inline int32 ACMRandom::Next() {
+  static const uint64 A = 16807;  // bits 14, 8, 7, 5, 2, 1, 0
+  // We are computing
+  //       seed_ = (seed_ * A) % M,    where M = 2^31-1
+  //
+  // seed_ must not be zero or M, or else all subsequent computed values
+  // will be zero or M respectively.  For all other values, seed_ will end
+  // up cycling through every number in [1,M-1]
+  uint64 product = seed_ * A;
+
+  // Compute (product % M) using the fact that ((x << 31) % M) == x.
+  seed_ = (product >> 31) + (product & M);
+  // The first reduction may overflow by 1 bit, so we may need to repeat.
+  // mod == M is not possible; using > allows the faster sign-bit-based test.
+  if (seed_ > M) {
+    seed_ -= M;
+  }
+  return seed_;
+}
+
+inline int32 ACMRandom::Skewed(int max_log) {
+  const int32 base = (Next() - 1) % (max_log+1);
+  return (Next() - 1) & ((1u << base)-1);
+}
+
+// A wall-time clock. This stub is not super-accurate, nor resistant to the
+// system time changing.
+class CycleTimer {
+ public:
+  CycleTimer() : real_time_us_(0) {}
+
+  void Start() {
+#ifdef WIN32
+    QueryPerformanceCounter(&start_);
+#else
+    gettimeofday(&start_, NULL);
+#endif
+  }
+
+  void Stop() {
+#ifdef WIN32
+    LARGE_INTEGER stop;
+    LARGE_INTEGER frequency;
+    QueryPerformanceCounter(&stop);
+    QueryPerformanceFrequency(&frequency);
+
+    double elapsed = static_cast<double>(stop.QuadPart - start_.QuadPart) /
+        frequency.QuadPart;
+    real_time_us_ += elapsed * 1e6 + 0.5;
+#else
+    struct timeval stop;
+    gettimeofday(&stop, NULL);
+
+    real_time_us_ += 1000000 * (stop.tv_sec - start_.tv_sec);
+    real_time_us_ += (stop.tv_usec - start_.tv_usec);
+#endif
+  }
+
+  double Get() {
+    return real_time_us_ * 1e-6;
+  }
+
+ private:
+  int64 real_time_us_;
+#ifdef WIN32
+  LARGE_INTEGER start_;
+#else
+  struct timeval start_;
+#endif
+};
+
+// Minimalistic microbenchmark framework.
+
+typedef void (*BenchmarkFunction)(int, int);
+
+class Benchmark {
+ public:
+  Benchmark(const string& name, BenchmarkFunction function) :
+      name_(name), function_(function) {}
+
+  Benchmark* DenseRange(int start, int stop) {
+    start_ = start;
+    stop_ = stop;
+    return this;
+  }
+
+  void Run();
+
+ private:
+  const string name_;
+  const BenchmarkFunction function_;
+  int start_, stop_;
+};
+#define BENCHMARK(benchmark_name) \
+  Benchmark* Benchmark_ ## benchmark_name = \
+          (new Benchmark(#benchmark_name, benchmark_name))
+
+extern Benchmark* Benchmark_BM_UFlat;
+extern Benchmark* Benchmark_BM_UValidate;
+extern Benchmark* Benchmark_BM_ZFlat;
+
+void ResetBenchmarkTiming();
+void StartBenchmarkTiming();
+void StopBenchmarkTiming();
+void SetBenchmarkLabel(const string& str);
+void SetBenchmarkBytesProcessed(int64 bytes);
+
+#ifdef HAVE_LIBZ
+
+// Object-oriented wrapper around zlib.
+class ZLib {
+ public:
+  ZLib();
+  ~ZLib();
+
+  // Wipe a ZLib object to a virgin state.  This differs from Reset()
+  // in that it also breaks any state.
+  void Reinit();
+
+  // Call this to make a zlib buffer as good as new.  Here's the only
+  // case where they differ:
+  //    CompressChunk(a); CompressChunk(b); CompressChunkDone();   vs
+  //    CompressChunk(a); Reset(); CompressChunk(b); CompressChunkDone();
+  // You'll want to use Reset(), then, when you interrupt a compress
+  // (or uncompress) in the middle of a chunk and want to start over.
+  void Reset();
+
+  // According to the zlib manual, when you Compress, the destination
+  // buffer must have size at least src + .1%*src + 12.  This function
+  // helps you calculate that.  Augment this to account for a potential
+  // gzip header and footer, plus a few bytes of slack.
+  static int MinCompressbufSize(int uncompress_size) {
+    return uncompress_size + uncompress_size/1000 + 40;
+  }
+
+  // Compresses the source buffer into the destination buffer.
+  // sourceLen is the byte length of the source buffer.
+  // Upon entry, destLen is the total size of the destination buffer,
+  // which must be of size at least MinCompressbufSize(sourceLen).
+  // Upon exit, destLen is the actual size of the compressed buffer.
+  //
+  // This function can be used to compress a whole file at once if the
+  // input file is mmap'ed.
+  //
+  // Returns Z_OK if success, Z_MEM_ERROR if there was not
+  // enough memory, Z_BUF_ERROR if there was not enough room in the
+  // output buffer. Note that if the output buffer is exactly the same
+  // size as the compressed result, we still return Z_BUF_ERROR.
+  // (check CL#1936076)
+  int Compress(Bytef *dest, uLongf *destLen,
+               const Bytef *source, uLong sourceLen);
+
+  // Uncompresses the source buffer into the destination buffer.
+  // The destination buffer must be long enough to hold the entire
+  // decompressed contents.
+  //
+  // Returns Z_OK on success, otherwise, it returns a zlib error code.
+  int Uncompress(Bytef *dest, uLongf *destLen,
+                 const Bytef *source, uLong sourceLen);
+
+  // Uncompress data one chunk at a time -- ie you can call this
+  // more than once.  To get this to work you need to call per-chunk
+  // and "done" routines.
+  //
+  // Returns Z_OK if success, Z_MEM_ERROR if there was not
+  // enough memory, Z_BUF_ERROR if there was not enough room in the
+  // output buffer.
+
+  int UncompressAtMost(Bytef *dest, uLongf *destLen,
+                       const Bytef *source, uLong *sourceLen);
+
+  // Checks gzip footer information, as needed.  Mostly this just
+  // makes sure the checksums match.  Whenever you call this, it
+  // will assume the last 8 bytes from the previous UncompressChunk
+  // call are the footer.  Returns true iff everything looks ok.
+  bool UncompressChunkDone();
+
+ private:
+  int InflateInit();       // sets up the zlib inflate structure
+  int DeflateInit();       // sets up the zlib deflate structure
+
+  // These init the zlib data structures for compressing/uncompressing
+  int CompressInit(Bytef *dest, uLongf *destLen,
+                   const Bytef *source, uLong *sourceLen);
+  int UncompressInit(Bytef *dest, uLongf *destLen,
+                     const Bytef *source, uLong *sourceLen);
+  // Initialization method to be called if we hit an error while
+  // uncompressing. On hitting an error, call this method before
+  // returning the error.
+  void UncompressErrorInit();
+
+  // Helper function for Compress
+  int CompressChunkOrAll(Bytef *dest, uLongf *destLen,
+                         const Bytef *source, uLong sourceLen,
+                         int flush_mode);
+  int CompressAtMostOrAll(Bytef *dest, uLongf *destLen,
+                          const Bytef *source, uLong *sourceLen,
+                          int flush_mode);
+
+  // Likewise for UncompressAndUncompressChunk
+  int UncompressChunkOrAll(Bytef *dest, uLongf *destLen,
+                           const Bytef *source, uLong sourceLen,
+                           int flush_mode);
+
+  int UncompressAtMostOrAll(Bytef *dest, uLongf *destLen,
+                            const Bytef *source, uLong *sourceLen,
+                            int flush_mode);
+
+  // Initialization method to be called if we hit an error while
+  // compressing. On hitting an error, call this method before
+  // returning the error.
+  void CompressErrorInit();
+
+  int compression_level_;   // compression level
+  int window_bits_;         // log base 2 of the window size used in compression
+  int mem_level_;           // specifies the amount of memory to be used by
+                            // compressor (1-9)
+  z_stream comp_stream_;    // Zlib stream data structure
+  bool comp_init_;          // True if we have initialized comp_stream_
+  z_stream uncomp_stream_;  // Zlib stream data structure
+  bool uncomp_init_;        // True if we have initialized uncomp_stream_
+
+  // These are used only with chunked compression.
+  bool first_chunk_;       // true if we need to emit headers with this chunk
+};
+
+#endif  // HAVE_LIBZ
+
+}  // namespace snappy
+
+DECLARE_bool(run_microbenchmarks);
+
+static void RunSpecifiedBenchmarks() {
+  if (!FLAGS_run_microbenchmarks) {
+    return;
+  }
+
+  fprintf(stderr, "Running microbenchmarks.\n");
+#ifndef NDEBUG
+  fprintf(stderr, "WARNING: Compiled with assertions enabled, will be slow.\n");
+#endif
+#ifndef __OPTIMIZE__
+  fprintf(stderr, "WARNING: Compiled without optimization, will be slow.\n");
+#endif
+  fprintf(stderr, "Benchmark            Time(ns)    CPU(ns) Iterations\n");
+  fprintf(stderr, "---------------------------------------------------\n");
+
+  snappy::Benchmark_BM_UFlat->Run();
+  snappy::Benchmark_BM_UValidate->Run();
+  snappy::Benchmark_BM_ZFlat->Run();
+
+  fprintf(stderr, "\n");
+}
+
+#ifndef HAVE_GTEST
+
+static inline int RUN_ALL_TESTS() {
+  fprintf(stderr, "Running correctness tests.\n");
+  snappy::Test_CorruptedTest_VerifyCorrupted();
+  snappy::Test_Snappy_SimpleTests();
+  snappy::Test_Snappy_MaxBlowup();
+  snappy::Test_Snappy_RandomData();
+  snappy::Test_Snappy_FourByteOffset();
+  snappy::Test_SnappyCorruption_TruncatedVarint();
+  snappy::Test_SnappyCorruption_UnterminatedVarint();
+  snappy::Test_Snappy_ReadPastEndOfBuffer();
+  snappy::Test_Snappy_FindMatchLength();
+  snappy::Test_Snappy_FindMatchLengthRandom();
+  fprintf(stderr, "All tests passed.\n");
+
+  return 0;
+}
+
+#endif  // HAVE_GTEST
+
+// For main().
+namespace snappy {
+
+static void CompressFile(const char* fname);
+static void UncompressFile(const char* fname);
+static void MeasureFile(const char* fname);
+
+// Logging.
+
+#define LOG(level) LogMessage()
+#define VLOG(level) true ? (void)0 : \
+    snappy::LogMessageVoidify() & snappy::LogMessage()
+
+class LogMessage {
+ public:
+  LogMessage() { }
+  ~LogMessage() {
+    cerr << endl;
+  }
+
+  LogMessage& operator<<(const std::string& msg) {
+    cerr << msg;
+    return *this;
+  }
+  LogMessage& operator<<(int x) {
+    cerr << x;
+    return *this;
+  }
+};
+
+// Asserts, both versions activated in debug mode only,
+// and ones that are always active.
+
+#define CRASH_UNLESS(condition) \
+    PREDICT_TRUE(condition) ? (void)0 : \
+    snappy::LogMessageVoidify() & snappy::LogMessageCrash()
+
+class LogMessageCrash : public LogMessage {
+ public:
+  LogMessageCrash() { }
+  ~LogMessageCrash() {
+    cerr << endl;
+    abort();
+  }
+};
+
+// This class is used to explicitly ignore values in the conditional
+// logging macros.  This avoids compiler warnings like "value computed
+// is not used" and "statement has no effect".
+
+class LogMessageVoidify {
+ public:
+  LogMessageVoidify() { }
+  // This has to be an operator with a precedence lower than << but
+  // higher than ?:
+  void operator&(const LogMessage&) { }
+};
+
+#define CHECK(cond) CRASH_UNLESS(cond)
+#define CHECK_LE(a, b) CRASH_UNLESS((a) <= (b))
+#define CHECK_GE(a, b) CRASH_UNLESS((a) >= (b))
+#define CHECK_EQ(a, b) CRASH_UNLESS((a) == (b))
+#define CHECK_NE(a, b) CRASH_UNLESS((a) != (b))
+#define CHECK_LT(a, b) CRASH_UNLESS((a) < (b))
+#define CHECK_GT(a, b) CRASH_UNLESS((a) > (b))
+
+}  // namespace
+
+using snappy::CompressFile;
+using snappy::UncompressFile;
+using snappy::MeasureFile;
+
+#endif  // UTIL_SNAPPY_OPENSOURCE_SNAPPY_TEST_H_