From 58841ef12f6cba1bb622353c1fcaa0e3c6fb46c9 Mon Sep 17 00:00:00 2001
From: Ilya Zhuravlev <zhuravlevilya@ya.ru>
Date: Tue, 23 Oct 2012 01:18:44 +0400
Subject: Add dummy and LevelDB database backends

---
 src/leveldb/util/env.cc | 96 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 96 insertions(+)
 create mode 100644 src/leveldb/util/env.cc

(limited to 'src/leveldb/util/env.cc')

diff --git a/src/leveldb/util/env.cc b/src/leveldb/util/env.cc
new file mode 100644
index 000000000..c2600e964
--- /dev/null
+++ b/src/leveldb/util/env.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 "leveldb/env.h"
+
+namespace leveldb {
+
+Env::~Env() {
+}
+
+SequentialFile::~SequentialFile() {
+}
+
+RandomAccessFile::~RandomAccessFile() {
+}
+
+WritableFile::~WritableFile() {
+}
+
+Logger::~Logger() {
+}
+
+FileLock::~FileLock() {
+}
+
+void Log(Logger* info_log, const char* format, ...) {
+  if (info_log != NULL) {
+    va_list ap;
+    va_start(ap, format);
+    info_log->Logv(format, ap);
+    va_end(ap);
+  }
+}
+
+static Status DoWriteStringToFile(Env* env, const Slice& data,
+                                  const std::string& fname,
+                                  bool should_sync) {
+  WritableFile* file;
+  Status s = env->NewWritableFile(fname, &file);
+  if (!s.ok()) {
+    return s;
+  }
+  s = file->Append(data);
+  if (s.ok() && should_sync) {
+    s = file->Sync();
+  }
+  if (s.ok()) {
+    s = file->Close();
+  }
+  delete file;  // Will auto-close if we did not close above
+  if (!s.ok()) {
+    env->DeleteFile(fname);
+  }
+  return s;
+}
+
+Status WriteStringToFile(Env* env, const Slice& data,
+                         const std::string& fname) {
+  return DoWriteStringToFile(env, data, fname, false);
+}
+
+Status WriteStringToFileSync(Env* env, const Slice& data,
+                             const std::string& fname) {
+  return DoWriteStringToFile(env, data, fname, true);
+}
+
+Status ReadFileToString(Env* env, const std::string& fname, std::string* data) {
+  data->clear();
+  SequentialFile* file;
+  Status s = env->NewSequentialFile(fname, &file);
+  if (!s.ok()) {
+    return s;
+  }
+  static const int kBufferSize = 8192;
+  char* space = new char[kBufferSize];
+  while (true) {
+    Slice fragment;
+    s = file->Read(kBufferSize, &fragment, space);
+    if (!s.ok()) {
+      break;
+    }
+    data->append(fragment.data(), fragment.size());
+    if (fragment.empty()) {
+      break;
+    }
+  }
+  delete[] space;
+  delete file;
+  return s;
+}
+
+EnvWrapper::~EnvWrapper() {
+}
+
+}  // namespace leveldb
-- 
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