The Tor Browser: ipc/chromium/src/base/platform_file

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

     1 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.

     2 // Use of this source code is governed by a BSD-style license that can be

     3 // found in the LICENSE file.

     5 #include "base/platform_file.h"

     7 #include "base/logging.h"

     9 namespace base {

    11 PlatformFile CreatePlatformFile(const std::wstring& name,

    12                                 int flags,

    13                                 bool* created) {

    14   DWORD disposition = 0;

    16   if (flags & PLATFORM_FILE_OPEN)

    17     disposition = OPEN_EXISTING;

    19   if (flags & PLATFORM_FILE_CREATE) {

    20     DCHECK(!disposition);

    21     disposition = CREATE_NEW;

    22   }

    24   if (flags & PLATFORM_FILE_OPEN_ALWAYS) {

    25     DCHECK(!disposition);

    26     disposition = OPEN_ALWAYS;

    27   }

    29   if (flags & PLATFORM_FILE_CREATE_ALWAYS) {

    30     DCHECK(!disposition);

    31     disposition = CREATE_ALWAYS;

    32   }

    34   if (!disposition) {

    35     NOTREACHED();

    36     return NULL;

    37   }

    39   DWORD access = (flags & PLATFORM_FILE_READ) ? GENERIC_READ : 0;

    40   if (flags & PLATFORM_FILE_WRITE)

    41     access |= GENERIC_WRITE;

    43   DWORD sharing = (flags & PLATFORM_FILE_EXCLUSIVE_READ) ? 0 : FILE_SHARE_READ;

    44   if (!(flags & PLATFORM_FILE_EXCLUSIVE_WRITE))

    45     sharing |= FILE_SHARE_WRITE;

    47   DWORD create_flags = 0;

    48   if (flags & PLATFORM_FILE_ASYNC)

    49     create_flags |= FILE_FLAG_OVERLAPPED;

    51   HANDLE file = CreateFile(name.c_str(), access, sharing, NULL, disposition,

    52                            create_flags, NULL);

    54   if ((flags & PLATFORM_FILE_OPEN_ALWAYS) && created &&

    55       INVALID_HANDLE_VALUE != file) {

    56     *created = (ERROR_ALREADY_EXISTS != GetLastError());

    57   }

    59   return file;

    60 }

    62 }  // namespace disk_cache

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