The Tor Browser: extensions/spellcheck/hunspell/src/hunspell_fopen

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

     1 /* This Source Code Form is subject to the terms of the Mozilla Public

     2  * License, v. 2.0. If a copy of the MPL was not distributed with this

     3  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     5 #ifndef fopen_hooks_h__

     6 #define fopen_hooks_h__

     8 /**

     9  * This file is force-included in hunspell code. Its purpose is to add

    10  * readahead to fopen() calls in hunspell without modifying its code, in order

    11  * to ease future upgrades.

    12  *

    13  * This file is force-included through mozilla-config.h which is generated

    14  * during the configure step.

    15  */

    17 #include "mozilla/FileUtils.h"

    18 #include <stdio.h>

    19 #include <string.h>

    21 #if defined(XP_WIN)

    22 #include "nsNativeCharsetUtils.h"

    23 #include "nsString.h"

    25 #include <fcntl.h>

    26 #include <windows.h>

    27 // Hunspell defines a function named near. Windef.h #defines near.

    28 #undef near

    29 // mozHunspell defines a function named RemoveDirectory.

    30 #undef RemoveDirectory

    31 #endif /* defined(XP_WIN) */

    33 inline FILE*

    34 hunspell_fopen_readahead(const char* filename, const char* mode)

    35 {

    36   if (!filename || !mode) {

    37     return nullptr;

    38   }

    39   // Fall back to libc's fopen for modes not supported by ReadAheadFile

    40   if (!strchr(mode, 'r') || strchr(mode, '+')) {

    41     return fopen(filename, mode);

    42   }

    43   int fd = -1;

    44 #if defined(XP_WIN)

    45   // filename is obtained via the nsIFile::nativePath attribute, so

    46   // it is using the Windows ANSI code page, NOT UTF-8!

    47   nsAutoString utf16Filename;

    48   nsresult rv = NS_CopyNativeToUnicode(nsDependentCString(filename),

    49                                        utf16Filename);

    50   if (NS_FAILED(rv)) {

    51     return nullptr;

    52   }

    53   HANDLE handle = INVALID_HANDLE_VALUE;

    54   mozilla::ReadAheadFile(utf16Filename.get(), 0, SIZE_MAX, &handle);

    55   if (handle == INVALID_HANDLE_VALUE) {

    56     return nullptr;

    57   }

    58   int flags = _O_RDONLY;

    59   // MSVC CRT's _open_osfhandle only supports adding _O_TEXT, not _O_BINARY

    60   if (strchr(mode, 't')) {

    61     // Force translated mode

    62     flags |= _O_TEXT;

    63   }

    64   // Import the Win32 fd into the CRT

    65   fd = _open_osfhandle((intptr_t)handle, flags);

    66   if (fd < 0) {

    67     CloseHandle(handle);

    68     return nullptr;

    69   }

    70 #else

    71   mozilla::ReadAheadFile(filename, 0, SIZE_MAX, &fd);

    72   if (fd < 0) {

    73     return nullptr;

    74   }

    75 #endif /* defined(XP_WIN) */

    77   FILE* file = fdopen(fd, mode);

    78   if (!file) {

    79     close(fd);

    80   }

    81   return file;

    82 }

    84 #define fopen(filename, mode) hunspell_fopen_readahead(filename, mode)

    86 #endif /* fopen_hooks_h__ */

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