302 lines
9.2 KiB
C++
302 lines
9.2 KiB
C++
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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "base/platform_file.h"
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#include <io.h>
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#include "base/files/file_path.h"
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#include "base/logging.h"
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#include "base/metrics/sparse_histogram.h"
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#include "base/threading/thread_restrictions.h"
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namespace base {
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PlatformFile CreatePlatformFileUnsafe(const FilePath& name,
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int flags,
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bool* created,
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PlatformFileError* error) {
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base::ThreadRestrictions::AssertIOAllowed();
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DWORD disposition = 0;
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if (created)
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*created = false;
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if (flags & PLATFORM_FILE_OPEN)
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disposition = OPEN_EXISTING;
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if (flags & PLATFORM_FILE_CREATE) {
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DCHECK(!disposition);
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disposition = CREATE_NEW;
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}
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if (flags & PLATFORM_FILE_OPEN_ALWAYS) {
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DCHECK(!disposition);
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disposition = OPEN_ALWAYS;
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}
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if (flags & PLATFORM_FILE_CREATE_ALWAYS) {
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DCHECK(!disposition);
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disposition = CREATE_ALWAYS;
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}
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if (flags & PLATFORM_FILE_OPEN_TRUNCATED) {
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DCHECK(!disposition);
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DCHECK(flags & PLATFORM_FILE_WRITE);
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disposition = TRUNCATE_EXISTING;
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}
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if (!disposition) {
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NOTREACHED();
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return NULL;
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}
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DWORD access = 0;
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if (flags & PLATFORM_FILE_WRITE)
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access = GENERIC_WRITE;
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if (flags & PLATFORM_FILE_APPEND) {
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DCHECK(!access);
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access = FILE_APPEND_DATA;
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}
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if (flags & PLATFORM_FILE_READ)
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access |= GENERIC_READ;
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if (flags & PLATFORM_FILE_WRITE_ATTRIBUTES)
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access |= FILE_WRITE_ATTRIBUTES;
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if (flags & PLATFORM_FILE_EXECUTE)
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access |= GENERIC_EXECUTE;
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DWORD sharing = (flags & PLATFORM_FILE_EXCLUSIVE_READ) ? 0 : FILE_SHARE_READ;
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if (!(flags & PLATFORM_FILE_EXCLUSIVE_WRITE))
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sharing |= FILE_SHARE_WRITE;
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if (flags & PLATFORM_FILE_SHARE_DELETE)
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sharing |= FILE_SHARE_DELETE;
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DWORD create_flags = 0;
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if (flags & PLATFORM_FILE_ASYNC)
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create_flags |= FILE_FLAG_OVERLAPPED;
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if (flags & PLATFORM_FILE_TEMPORARY)
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create_flags |= FILE_ATTRIBUTE_TEMPORARY;
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if (flags & PLATFORM_FILE_HIDDEN)
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create_flags |= FILE_ATTRIBUTE_HIDDEN;
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if (flags & PLATFORM_FILE_DELETE_ON_CLOSE)
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create_flags |= FILE_FLAG_DELETE_ON_CLOSE;
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if (flags & PLATFORM_FILE_BACKUP_SEMANTICS)
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create_flags |= FILE_FLAG_BACKUP_SEMANTICS;
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HANDLE file = CreateFile(name.value().c_str(), access, sharing, NULL,
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disposition, create_flags, NULL);
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if (created && (INVALID_HANDLE_VALUE != file)) {
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if (flags & (PLATFORM_FILE_OPEN_ALWAYS))
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*created = (ERROR_ALREADY_EXISTS != GetLastError());
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else if (flags & (PLATFORM_FILE_CREATE_ALWAYS | PLATFORM_FILE_CREATE))
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*created = true;
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}
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if (error) {
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if (file != kInvalidPlatformFileValue)
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*error = PLATFORM_FILE_OK;
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else
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*error = LastErrorToPlatformFileError(GetLastError());
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}
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return file;
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}
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FILE* FdopenPlatformFile(PlatformFile file, const char* mode) {
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if (file == kInvalidPlatformFileValue)
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return NULL;
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int fd = _open_osfhandle(reinterpret_cast<intptr_t>(file), 0);
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if (fd < 0)
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return NULL;
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return _fdopen(fd, mode);
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}
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bool ClosePlatformFile(PlatformFile file) {
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base::ThreadRestrictions::AssertIOAllowed();
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return (CloseHandle(file) != 0);
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}
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int64 SeekPlatformFile(PlatformFile file,
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PlatformFileWhence whence,
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int64 offset) {
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base::ThreadRestrictions::AssertIOAllowed();
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if (file == kInvalidPlatformFileValue || offset < 0)
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return -1;
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LARGE_INTEGER distance, res;
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distance.QuadPart = offset;
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DWORD move_method = static_cast<DWORD>(whence);
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if (!SetFilePointerEx(file, distance, &res, move_method))
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return -1;
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return res.QuadPart;
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}
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int ReadPlatformFile(PlatformFile file, int64 offset, char* data, int size) {
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base::ThreadRestrictions::AssertIOAllowed();
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if (file == kInvalidPlatformFileValue)
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return -1;
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LARGE_INTEGER offset_li;
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offset_li.QuadPart = offset;
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OVERLAPPED overlapped = {0};
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overlapped.Offset = offset_li.LowPart;
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overlapped.OffsetHigh = offset_li.HighPart;
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DWORD bytes_read;
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if (::ReadFile(file, data, size, &bytes_read, &overlapped) != 0)
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return bytes_read;
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else if (ERROR_HANDLE_EOF == GetLastError())
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return 0;
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return -1;
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}
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int ReadPlatformFileAtCurrentPos(PlatformFile file, char* data, int size) {
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return ReadPlatformFile(file, 0, data, size);
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}
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int ReadPlatformFileNoBestEffort(PlatformFile file, int64 offset, char* data,
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int size) {
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return ReadPlatformFile(file, offset, data, size);
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}
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int ReadPlatformFileCurPosNoBestEffort(PlatformFile file,
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char* data, int size) {
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return ReadPlatformFile(file, 0, data, size);
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}
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int WritePlatformFile(PlatformFile file, int64 offset,
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const char* data, int size) {
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base::ThreadRestrictions::AssertIOAllowed();
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if (file == kInvalidPlatformFileValue)
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return -1;
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LARGE_INTEGER offset_li;
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offset_li.QuadPart = offset;
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OVERLAPPED overlapped = {0};
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overlapped.Offset = offset_li.LowPart;
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overlapped.OffsetHigh = offset_li.HighPart;
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DWORD bytes_written;
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if (::WriteFile(file, data, size, &bytes_written, &overlapped) != 0)
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return bytes_written;
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return -1;
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}
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int WritePlatformFileAtCurrentPos(PlatformFile file, const char* data,
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int size) {
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return WritePlatformFile(file, 0, data, size);
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}
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int WritePlatformFileCurPosNoBestEffort(PlatformFile file,
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const char* data, int size) {
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return WritePlatformFile(file, 0, data, size);
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}
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bool TruncatePlatformFile(PlatformFile file, int64 length) {
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base::ThreadRestrictions::AssertIOAllowed();
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if (file == kInvalidPlatformFileValue)
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return false;
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// Get the current file pointer.
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LARGE_INTEGER file_pointer;
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LARGE_INTEGER zero;
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zero.QuadPart = 0;
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if (::SetFilePointerEx(file, zero, &file_pointer, FILE_CURRENT) == 0)
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return false;
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LARGE_INTEGER length_li;
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length_li.QuadPart = length;
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// If length > file size, SetFilePointerEx() should extend the file
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// with zeroes on all Windows standard file systems (NTFS, FATxx).
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if (!::SetFilePointerEx(file, length_li, NULL, FILE_BEGIN))
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return false;
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// Set the new file length and move the file pointer to its old position.
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// This is consistent with ftruncate()'s behavior, even when the file
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// pointer points to a location beyond the end of the file.
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return ((::SetEndOfFile(file) != 0) &&
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(::SetFilePointerEx(file, file_pointer, NULL, FILE_BEGIN) != 0));
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}
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bool FlushPlatformFile(PlatformFile file) {
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base::ThreadRestrictions::AssertIOAllowed();
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return ((file != kInvalidPlatformFileValue) && ::FlushFileBuffers(file));
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}
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bool TouchPlatformFile(PlatformFile file, const base::Time& last_access_time,
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const base::Time& last_modified_time) {
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base::ThreadRestrictions::AssertIOAllowed();
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if (file == kInvalidPlatformFileValue)
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return false;
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FILETIME last_access_filetime = last_access_time.ToFileTime();
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FILETIME last_modified_filetime = last_modified_time.ToFileTime();
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return (::SetFileTime(file, NULL, &last_access_filetime,
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&last_modified_filetime) != 0);
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}
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bool GetPlatformFileInfo(PlatformFile file, PlatformFileInfo* info) {
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base::ThreadRestrictions::AssertIOAllowed();
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if (!info)
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return false;
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BY_HANDLE_FILE_INFORMATION file_info;
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if (GetFileInformationByHandle(file, &file_info) == 0)
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return false;
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LARGE_INTEGER size;
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size.HighPart = file_info.nFileSizeHigh;
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size.LowPart = file_info.nFileSizeLow;
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info->size = size.QuadPart;
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info->is_directory =
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(file_info.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) != 0;
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info->is_symbolic_link = false; // Windows doesn't have symbolic links.
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info->last_modified = base::Time::FromFileTime(file_info.ftLastWriteTime);
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info->last_accessed = base::Time::FromFileTime(file_info.ftLastAccessTime);
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info->creation_time = base::Time::FromFileTime(file_info.ftCreationTime);
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return true;
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}
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PlatformFileError LastErrorToPlatformFileError(DWORD last_error) {
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switch (last_error) {
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case ERROR_SHARING_VIOLATION:
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return PLATFORM_FILE_ERROR_IN_USE;
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case ERROR_FILE_EXISTS:
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return PLATFORM_FILE_ERROR_EXISTS;
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case ERROR_FILE_NOT_FOUND:
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case ERROR_PATH_NOT_FOUND:
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return PLATFORM_FILE_ERROR_NOT_FOUND;
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case ERROR_ACCESS_DENIED:
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return PLATFORM_FILE_ERROR_ACCESS_DENIED;
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case ERROR_TOO_MANY_OPEN_FILES:
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return PLATFORM_FILE_ERROR_TOO_MANY_OPENED;
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case ERROR_OUTOFMEMORY:
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case ERROR_NOT_ENOUGH_MEMORY:
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return PLATFORM_FILE_ERROR_NO_MEMORY;
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case ERROR_HANDLE_DISK_FULL:
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case ERROR_DISK_FULL:
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case ERROR_DISK_RESOURCES_EXHAUSTED:
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return PLATFORM_FILE_ERROR_NO_SPACE;
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case ERROR_USER_MAPPED_FILE:
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return PLATFORM_FILE_ERROR_INVALID_OPERATION;
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case ERROR_NOT_READY:
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case ERROR_SECTOR_NOT_FOUND:
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case ERROR_DEV_NOT_EXIST:
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case ERROR_IO_DEVICE:
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case ERROR_FILE_CORRUPT:
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case ERROR_DISK_CORRUPT:
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return PLATFORM_FILE_ERROR_IO;
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default:
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UMA_HISTOGRAM_SPARSE_SLOWLY("PlatformFile.UnknownErrors.Windows",
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last_error);
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return PLATFORM_FILE_ERROR_FAILED;
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}
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}
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} // namespace base
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