Migrate webkit/browser/ to storage/browser/

webkit/browser/database/vfs_backend.cc

-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "webkit/browser/database/vfs_backend.h"
-
-#include "base/file_util.h"
-#include "base/files/file_path.h"
-#include "base/logging.h"
-#include "third_party/sqlite/sqlite3.h"
-
-namespace storage {
-
-static const int kFileTypeMask = 0x00007F00;
-
-// static
-bool VfsBackend::OpenTypeIsReadWrite(int desired_flags) {
-  return (desired_flags & SQLITE_OPEN_READWRITE) != 0;
-}
-
-// static
-bool VfsBackend::OpenFileFlagsAreConsistent(int desired_flags) {
-  const int file_type = desired_flags & kFileTypeMask;
-  const bool is_exclusive = (desired_flags & SQLITE_OPEN_EXCLUSIVE) != 0;
-  const bool is_delete = (desired_flags & SQLITE_OPEN_DELETEONCLOSE) != 0;
-  const bool is_create = (desired_flags & SQLITE_OPEN_CREATE) != 0;
-  const bool is_read_only = (desired_flags & SQLITE_OPEN_READONLY) != 0;
-  const bool is_read_write = (desired_flags & SQLITE_OPEN_READWRITE) != 0;
-
-  // All files should be opened either read-write or read-only, but not both.
-  if (is_read_only == is_read_write)
-    return false;
-
-  // If a new file is created, it must also be writable.
-  if (is_create && !is_read_write)
-    return false;
-
-  // If we're accessing an existing file, we cannot give exclusive access, and
-  // we can't delete it.
-  // Normally, we'd also check that 'is_delete' is false for a main DB, main
-  // journal or master journal file; however, when in incognito mode, we use
-  // the SQLITE_OPEN_DELETEONCLOSE flag when opening those files too and keep
-  // an open handle to them for as long as the incognito profile is around.
-  if ((is_exclusive || is_delete) && !is_create)
-    return false;
-
-  // Make sure we're opening the DB directory or that a file type is set.
-  return (file_type == SQLITE_OPEN_MAIN_DB) ||
-         (file_type == SQLITE_OPEN_TEMP_DB) ||
-         (file_type == SQLITE_OPEN_MAIN_JOURNAL) ||
-         (file_type == SQLITE_OPEN_TEMP_JOURNAL) ||
-         (file_type == SQLITE_OPEN_SUBJOURNAL) ||
-         (file_type == SQLITE_OPEN_MASTER_JOURNAL) ||
-         (file_type == SQLITE_OPEN_TRANSIENT_DB);
-}
-
-// static
-base::File VfsBackend::OpenFile(const base::FilePath& file_path,
-                                int desired_flags) {
-  DCHECK(!file_path.empty());
-
-  // Verify the flags for consistency and create the database
-  // directory if it doesn't exist.
-  if (!OpenFileFlagsAreConsistent(desired_flags) ||
-      !base::CreateDirectory(file_path.DirName())) {
-    return base::File();
-  }
-
-  int flags = 0;
-  flags |= base::File::FLAG_READ;
-  if (desired_flags & SQLITE_OPEN_READWRITE)
-    flags |= base::File::FLAG_WRITE;
-
-  if (!(desired_flags & SQLITE_OPEN_MAIN_DB))
-    flags |= base::File::FLAG_EXCLUSIVE_READ | base::File::FLAG_EXCLUSIVE_WRITE;
-
-  flags |= ((desired_flags & SQLITE_OPEN_CREATE) ?
-           base::File::FLAG_OPEN_ALWAYS : base::File::FLAG_OPEN);
-
-  if (desired_flags & SQLITE_OPEN_EXCLUSIVE)
-    flags |= base::File::FLAG_EXCLUSIVE_READ | base::File::FLAG_EXCLUSIVE_WRITE;
-
-  if (desired_flags & SQLITE_OPEN_DELETEONCLOSE) {
-    flags |= base::File::FLAG_TEMPORARY | base::File::FLAG_HIDDEN |
-             base::File::FLAG_DELETE_ON_CLOSE;
-  }
-
-  // This flag will allow us to delete the file later on from the browser
-  // process.
-  flags |= base::File::FLAG_SHARE_DELETE;
-
-  // Try to open/create the DB file.
-  return base::File(file_path, flags);
-}
-
-// static
-base::File VfsBackend::OpenTempFileInDirectory(const base::FilePath& dir_path,
-                                               int desired_flags) {
-  // We should be able to delete temp files when they're closed
-  // and create them as needed
-  if (!(desired_flags & SQLITE_OPEN_DELETEONCLOSE) ||
-      !(desired_flags & SQLITE_OPEN_CREATE)) {
-    return base::File();
-  }
-
-  // Get a unique temp file name in the database directory.
-  base::FilePath temp_file_path;
-  if (!base::CreateTemporaryFileInDir(dir_path, &temp_file_path))
-    return base::File();
-
-  return OpenFile(temp_file_path, desired_flags);
-}
-
-// static
-int VfsBackend::DeleteFile(const base::FilePath& file_path, bool sync_dir) {
-  if (!base::PathExists(file_path))
-    return SQLITE_OK;
-  if (!base::DeleteFile(file_path, false))
-    return SQLITE_IOERR_DELETE;
-
-  int error_code = SQLITE_OK;
-#if defined(OS_POSIX)
-  if (sync_dir) {
-    base::File dir(file_path.DirName(), base::File::FLAG_READ);
-    if (dir.IsValid()) {
-      if (!dir.Flush())
-        error_code = SQLITE_IOERR_DIR_FSYNC;
-    } else {
-      error_code = SQLITE_CANTOPEN;
-    }
-  }
-#endif
-  return error_code;
-}
-
-// static
-uint32 VfsBackend::GetFileAttributes(const base::FilePath& file_path) {
-#if defined(OS_WIN)
-  uint32 attributes = ::GetFileAttributes(file_path.value().c_str());
-#elif defined(OS_POSIX)
-  uint32 attributes = 0;
-  if (!access(file_path.value().c_str(), R_OK))
-    attributes |= static_cast<uint32>(R_OK);
-  if (!access(file_path.value().c_str(), W_OK))
-    attributes |= static_cast<uint32>(W_OK);
-  if (!attributes)
-    attributes = -1;
-#endif
-  return attributes;
-}
-
-// static
-int64 VfsBackend::GetFileSize(const base::FilePath& file_path) {
-  int64 size = 0;
-  return (base::GetFileSize(file_path, &size) ? size : 0);
-}
-
-}  // namespace storage