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fs.c
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fs.c
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/* Copyright Joyent, Inc. and other Node contributors. All rights reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#include <assert.h>
#include <stdlib.h>
#include <direct.h>
#include <errno.h>
#include <fcntl.h>
#include <io.h>
#include <limits.h>
#include <sys/stat.h>
#include <sys/utime.h>
#include <stdio.h>
#include "uv.h"
#include "internal.h"
#include "req-inl.h"
#include "handle-inl.h"
#include "fs-fd-hash-inl.h"
#define UV_FS_FREE_PATHS 0x0002
#define UV_FS_FREE_PTR 0x0008
#define UV_FS_CLEANEDUP 0x0010
#define INIT(subtype) \
do { \
if (req == NULL) \
return UV_EINVAL; \
uv_fs_req_init(loop, req, subtype, cb); \
} \
while (0)
#define POST \
do { \
if (cb != NULL) { \
uv__req_register(loop, req); \
uv__work_submit(loop, \
&req->work_req, \
UV__WORK_FAST_IO, \
uv__fs_work, \
uv__fs_done); \
return 0; \
} else { \
uv__fs_work(&req->work_req); \
return req->result; \
} \
} \
while (0)
#define SET_REQ_RESULT(req, result_value) \
do { \
req->result = (result_value); \
assert(req->result != -1); \
} while (0)
#define SET_REQ_WIN32_ERROR(req, sys_errno) \
do { \
req->sys_errno_ = (sys_errno); \
req->result = uv_translate_sys_error(req->sys_errno_); \
} while (0)
#define SET_REQ_UV_ERROR(req, uv_errno, sys_errno) \
do { \
req->result = (uv_errno); \
req->sys_errno_ = (sys_errno); \
} while (0)
#define VERIFY_FD(fd, req) \
if (fd == -1) { \
req->result = UV_EBADF; \
req->sys_errno_ = ERROR_INVALID_HANDLE; \
return; \
}
#define MILLION ((int64_t) 1000 * 1000)
#define BILLION ((int64_t) 1000 * 1000 * 1000)
static void uv__filetime_to_timespec(uv_timespec_t *ts, int64_t filetime) {
filetime -= 116444736 * BILLION;
ts->tv_sec = (long) (filetime / (10 * MILLION));
ts->tv_nsec = (long) ((filetime - ts->tv_sec * 10 * MILLION) * 100U);
if (ts->tv_nsec < 0) {
ts->tv_sec -= 1;
ts->tv_nsec += 1e9;
}
}
#define TIME_T_TO_FILETIME(time, filetime_ptr) \
do { \
int64_t bigtime = ((time) * 10 * MILLION + 116444736 * BILLION); \
(filetime_ptr)->dwLowDateTime = (uint64_t) bigtime & 0xFFFFFFFF; \
(filetime_ptr)->dwHighDateTime = (uint64_t) bigtime >> 32; \
} while(0)
#define IS_SLASH(c) ((c) == L'\\' || (c) == L'/')
#define IS_LETTER(c) (((c) >= L'a' && (c) <= L'z') || \
((c) >= L'A' && (c) <= L'Z'))
#define MIN(a,b) (((a) < (b)) ? (a) : (b))
const WCHAR JUNCTION_PREFIX[] = L"\\??\\";
const WCHAR JUNCTION_PREFIX_LEN = 4;
const WCHAR LONG_PATH_PREFIX[] = L"\\\\?\\";
const WCHAR LONG_PATH_PREFIX_LEN = 4;
const WCHAR UNC_PATH_PREFIX[] = L"\\\\?\\UNC\\";
const WCHAR UNC_PATH_PREFIX_LEN = 8;
static int uv__file_symlink_usermode_flag = SYMBOLIC_LINK_FLAG_ALLOW_UNPRIVILEGED_CREATE;
static DWORD uv__allocation_granularity;
void uv_fs_init(void) {
SYSTEM_INFO system_info;
GetSystemInfo(&system_info);
uv__allocation_granularity = system_info.dwAllocationGranularity;
uv__fd_hash_init();
}
INLINE static int fs__capture_path(uv_fs_t* req, const char* path,
const char* new_path, const int copy_path) {
char* buf;
char* pos;
ssize_t buf_sz = 0, path_len = 0, pathw_len = 0, new_pathw_len = 0;
/* new_path can only be set if path is also set. */
assert(new_path == NULL || path != NULL);
if (path != NULL) {
pathw_len = MultiByteToWideChar(CP_UTF8,
0,
path,
-1,
NULL,
0);
if (pathw_len == 0) {
return GetLastError();
}
buf_sz += pathw_len * sizeof(WCHAR);
}
if (path != NULL && copy_path) {
path_len = 1 + strlen(path);
buf_sz += path_len;
}
if (new_path != NULL) {
new_pathw_len = MultiByteToWideChar(CP_UTF8,
0,
new_path,
-1,
NULL,
0);
if (new_pathw_len == 0) {
return GetLastError();
}
buf_sz += new_pathw_len * sizeof(WCHAR);
}
if (buf_sz == 0) {
req->file.pathw = NULL;
req->fs.info.new_pathw = NULL;
req->path = NULL;
return 0;
}
buf = (char*) uv__malloc(buf_sz);
if (buf == NULL) {
return ERROR_OUTOFMEMORY;
}
pos = buf;
if (path != NULL) {
DWORD r = MultiByteToWideChar(CP_UTF8,
0,
path,
-1,
(WCHAR*) pos,
pathw_len);
assert(r == (DWORD) pathw_len);
req->file.pathw = (WCHAR*) pos;
pos += r * sizeof(WCHAR);
} else {
req->file.pathw = NULL;
}
if (new_path != NULL) {
DWORD r = MultiByteToWideChar(CP_UTF8,
0,
new_path,
-1,
(WCHAR*) pos,
new_pathw_len);
assert(r == (DWORD) new_pathw_len);
req->fs.info.new_pathw = (WCHAR*) pos;
pos += r * sizeof(WCHAR);
} else {
req->fs.info.new_pathw = NULL;
}
req->path = path;
if (path != NULL && copy_path) {
memcpy(pos, path, path_len);
assert(path_len == buf_sz - (pos - buf));
req->path = pos;
}
req->flags |= UV_FS_FREE_PATHS;
return 0;
}
INLINE static void uv_fs_req_init(uv_loop_t* loop, uv_fs_t* req,
uv_fs_type fs_type, const uv_fs_cb cb) {
uv__once_init();
UV_REQ_INIT(req, UV_FS);
req->loop = loop;
req->flags = 0;
req->fs_type = fs_type;
req->sys_errno_ = 0;
req->result = 0;
req->ptr = NULL;
req->path = NULL;
req->cb = cb;
memset(&req->fs, 0, sizeof(req->fs));
}
static int fs__wide_to_utf8(WCHAR* w_source_ptr,
DWORD w_source_len,
char** target_ptr,
uint64_t* target_len_ptr) {
int r;
int target_len;
char* target;
target_len = WideCharToMultiByte(CP_UTF8,
0,
w_source_ptr,
w_source_len,
NULL,
0,
NULL,
NULL);
if (target_len == 0) {
return -1;
}
if (target_len_ptr != NULL) {
*target_len_ptr = target_len;
}
if (target_ptr == NULL) {
return 0;
}
target = uv__malloc(target_len + 1);
if (target == NULL) {
SetLastError(ERROR_OUTOFMEMORY);
return -1;
}
r = WideCharToMultiByte(CP_UTF8,
0,
w_source_ptr,
w_source_len,
target,
target_len,
NULL,
NULL);
assert(r == target_len);
target[target_len] = '\0';
*target_ptr = target;
return 0;
}
INLINE static int fs__readlink_handle(HANDLE handle, char** target_ptr,
uint64_t* target_len_ptr) {
char buffer[MAXIMUM_REPARSE_DATA_BUFFER_SIZE];
REPARSE_DATA_BUFFER* reparse_data = (REPARSE_DATA_BUFFER*) buffer;
WCHAR* w_target;
DWORD w_target_len;
DWORD bytes;
size_t i;
size_t len;
if (!DeviceIoControl(handle,
FSCTL_GET_REPARSE_POINT,
NULL,
0,
buffer,
sizeof buffer,
&bytes,
NULL)) {
return -1;
}
if (reparse_data->ReparseTag == IO_REPARSE_TAG_SYMLINK) {
/* Real symlink */
w_target = reparse_data->SymbolicLinkReparseBuffer.PathBuffer +
(reparse_data->SymbolicLinkReparseBuffer.SubstituteNameOffset /
sizeof(WCHAR));
w_target_len =
reparse_data->SymbolicLinkReparseBuffer.SubstituteNameLength /
sizeof(WCHAR);
/* Real symlinks can contain pretty much everything, but the only thing we
* really care about is undoing the implicit conversion to an NT namespaced
* path that CreateSymbolicLink will perform on absolute paths. If the path
* is win32-namespaced then the user must have explicitly made it so, and
* we better just return the unmodified reparse data. */
if (w_target_len >= 4 &&
w_target[0] == L'\\' &&
w_target[1] == L'?' &&
w_target[2] == L'?' &&
w_target[3] == L'\\') {
/* Starts with \??\ */
if (w_target_len >= 6 &&
((w_target[4] >= L'A' && w_target[4] <= L'Z') ||
(w_target[4] >= L'a' && w_target[4] <= L'z')) &&
w_target[5] == L':' &&
(w_target_len == 6 || w_target[6] == L'\\')) {
/* \??\<drive>:\ */
w_target += 4;
w_target_len -= 4;
} else if (w_target_len >= 8 &&
(w_target[4] == L'U' || w_target[4] == L'u') &&
(w_target[5] == L'N' || w_target[5] == L'n') &&
(w_target[6] == L'C' || w_target[6] == L'c') &&
w_target[7] == L'\\') {
/* \??\UNC\<server>\<share>\ - make sure the final path looks like
* \\<server>\<share>\ */
w_target += 6;
w_target[0] = L'\\';
w_target_len -= 6;
}
}
} else if (reparse_data->ReparseTag == IO_REPARSE_TAG_MOUNT_POINT) {
/* Junction. */
w_target = reparse_data->MountPointReparseBuffer.PathBuffer +
(reparse_data->MountPointReparseBuffer.SubstituteNameOffset /
sizeof(WCHAR));
w_target_len = reparse_data->MountPointReparseBuffer.SubstituteNameLength /
sizeof(WCHAR);
/* Only treat junctions that look like \??\<drive>:\ as symlink. Junctions
* can also be used as mount points, like \??\Volume{<guid>}, but that's
* confusing for programs since they wouldn't be able to actually
* understand such a path when returned by uv_readlink(). UNC paths are
* never valid for junctions so we don't care about them. */
if (!(w_target_len >= 6 &&
w_target[0] == L'\\' &&
w_target[1] == L'?' &&
w_target[2] == L'?' &&
w_target[3] == L'\\' &&
((w_target[4] >= L'A' && w_target[4] <= L'Z') ||
(w_target[4] >= L'a' && w_target[4] <= L'z')) &&
w_target[5] == L':' &&
(w_target_len == 6 || w_target[6] == L'\\'))) {
SetLastError(ERROR_SYMLINK_NOT_SUPPORTED);
return -1;
}
/* Remove leading \??\ */
w_target += 4;
w_target_len -= 4;
} else if (reparse_data->ReparseTag == IO_REPARSE_TAG_APPEXECLINK) {
/* String #3 in the list has the target filename. */
if (reparse_data->AppExecLinkReparseBuffer.StringCount < 3) {
SetLastError(ERROR_SYMLINK_NOT_SUPPORTED);
return -1;
}
w_target = reparse_data->AppExecLinkReparseBuffer.StringList;
/* The StringList buffer contains a list of strings separated by "\0", */
/* with "\0\0" terminating the list. Move to the 3rd string in the list: */
for (i = 0; i < 2; ++i) {
len = wcslen(w_target);
if (len == 0) {
SetLastError(ERROR_SYMLINK_NOT_SUPPORTED);
return -1;
}
w_target += len + 1;
}
w_target_len = wcslen(w_target);
if (w_target_len == 0) {
SetLastError(ERROR_SYMLINK_NOT_SUPPORTED);
return -1;
}
/* Make sure it is an absolute path. */
if (!(w_target_len >= 3 &&
((w_target[0] >= L'a' && w_target[0] <= L'z') ||
(w_target[0] >= L'A' && w_target[0] <= L'Z')) &&
w_target[1] == L':' &&
w_target[2] == L'\\')) {
SetLastError(ERROR_SYMLINK_NOT_SUPPORTED);
return -1;
}
} else {
/* Reparse tag does not indicate a symlink. */
SetLastError(ERROR_SYMLINK_NOT_SUPPORTED);
return -1;
}
return fs__wide_to_utf8(w_target, w_target_len, target_ptr, target_len_ptr);
}
void fs__open(uv_fs_t* req) {
DWORD access;
DWORD share;
DWORD disposition;
DWORD attributes = 0;
HANDLE file;
int fd, current_umask;
int flags = req->fs.info.file_flags;
struct uv__fd_info_s fd_info;
/* Adjust flags to be compatible with the memory file mapping. Save the
* original flags to emulate the correct behavior. */
if (flags & UV_FS_O_FILEMAP) {
fd_info.flags = flags;
fd_info.current_pos.QuadPart = 0;
if ((flags & (UV_FS_O_RDONLY | UV_FS_O_WRONLY | UV_FS_O_RDWR)) ==
UV_FS_O_WRONLY) {
/* CreateFileMapping always needs read access */
flags = (flags & ~UV_FS_O_WRONLY) | UV_FS_O_RDWR;
}
if (flags & UV_FS_O_APPEND) {
/* Clear the append flag and ensure RDRW mode */
flags &= ~UV_FS_O_APPEND;
flags &= ~(UV_FS_O_RDONLY | UV_FS_O_WRONLY | UV_FS_O_RDWR);
flags |= UV_FS_O_RDWR;
}
}
/* Obtain the active umask. umask() never fails and returns the previous
* umask. */
current_umask = umask(0);
umask(current_umask);
/* convert flags and mode to CreateFile parameters */
switch (flags & (UV_FS_O_RDONLY | UV_FS_O_WRONLY | UV_FS_O_RDWR)) {
case UV_FS_O_RDONLY:
access = FILE_GENERIC_READ;
break;
case UV_FS_O_WRONLY:
access = FILE_GENERIC_WRITE;
break;
case UV_FS_O_RDWR:
access = FILE_GENERIC_READ | FILE_GENERIC_WRITE;
break;
default:
goto einval;
}
if (flags & UV_FS_O_APPEND) {
access &= ~FILE_WRITE_DATA;
access |= FILE_APPEND_DATA;
}
/*
* Here is where we deviate significantly from what CRT's _open()
* does. We indiscriminately use all the sharing modes, to match
* UNIX semantics. In particular, this ensures that the file can
* be deleted even whilst it's open, fixing issue
* https://github.com/nodejs/node-v0.x-archive/issues/1449.
* We still support exclusive sharing mode, since it is necessary
* for opening raw block devices, otherwise Windows will prevent
* any attempt to write past the master boot record.
*/
if (flags & UV_FS_O_EXLOCK) {
share = 0;
} else {
share = FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE;
}
switch (flags & (UV_FS_O_CREAT | UV_FS_O_EXCL | UV_FS_O_TRUNC)) {
case 0:
case UV_FS_O_EXCL:
disposition = OPEN_EXISTING;
break;
case UV_FS_O_CREAT:
disposition = OPEN_ALWAYS;
break;
case UV_FS_O_CREAT | UV_FS_O_EXCL:
case UV_FS_O_CREAT | UV_FS_O_TRUNC | UV_FS_O_EXCL:
disposition = CREATE_NEW;
break;
case UV_FS_O_TRUNC:
case UV_FS_O_TRUNC | UV_FS_O_EXCL:
disposition = TRUNCATE_EXISTING;
break;
case UV_FS_O_CREAT | UV_FS_O_TRUNC:
disposition = CREATE_ALWAYS;
break;
default:
goto einval;
}
attributes |= FILE_ATTRIBUTE_NORMAL;
if (flags & UV_FS_O_CREAT) {
if (!((req->fs.info.mode & ~current_umask) & _S_IWRITE)) {
attributes |= FILE_ATTRIBUTE_READONLY;
}
}
if (flags & UV_FS_O_TEMPORARY ) {
attributes |= FILE_FLAG_DELETE_ON_CLOSE | FILE_ATTRIBUTE_TEMPORARY;
access |= DELETE;
}
if (flags & UV_FS_O_SHORT_LIVED) {
attributes |= FILE_ATTRIBUTE_TEMPORARY;
}
switch (flags & (UV_FS_O_SEQUENTIAL | UV_FS_O_RANDOM)) {
case 0:
break;
case UV_FS_O_SEQUENTIAL:
attributes |= FILE_FLAG_SEQUENTIAL_SCAN;
break;
case UV_FS_O_RANDOM:
attributes |= FILE_FLAG_RANDOM_ACCESS;
break;
default:
goto einval;
}
if (flags & UV_FS_O_DIRECT) {
/*
* FILE_APPEND_DATA and FILE_FLAG_NO_BUFFERING are mutually exclusive.
* Windows returns 87, ERROR_INVALID_PARAMETER if these are combined.
*
* FILE_APPEND_DATA is included in FILE_GENERIC_WRITE:
*
* FILE_GENERIC_WRITE = STANDARD_RIGHTS_WRITE |
* FILE_WRITE_DATA |
* FILE_WRITE_ATTRIBUTES |
* FILE_WRITE_EA |
* FILE_APPEND_DATA |
* SYNCHRONIZE
*
* Note: Appends are also permitted by FILE_WRITE_DATA.
*
* In order for direct writes and direct appends to succeed, we therefore
* exclude FILE_APPEND_DATA if FILE_WRITE_DATA is specified, and otherwise
* fail if the user's sole permission is a direct append, since this
* particular combination is invalid.
*/
if (access & FILE_APPEND_DATA) {
if (access & FILE_WRITE_DATA) {
access &= ~FILE_APPEND_DATA;
} else {
goto einval;
}
}
attributes |= FILE_FLAG_NO_BUFFERING;
}
switch (flags & (UV_FS_O_DSYNC | UV_FS_O_SYNC)) {
case 0:
break;
case UV_FS_O_DSYNC:
case UV_FS_O_SYNC:
attributes |= FILE_FLAG_WRITE_THROUGH;
break;
default:
goto einval;
}
/* Setting this flag makes it possible to open a directory. */
attributes |= FILE_FLAG_BACKUP_SEMANTICS;
file = CreateFileW(req->file.pathw,
access,
share,
NULL,
disposition,
attributes,
NULL);
if (file == INVALID_HANDLE_VALUE) {
DWORD error = GetLastError();
if (error == ERROR_FILE_EXISTS && (flags & UV_FS_O_CREAT) &&
!(flags & UV_FS_O_EXCL)) {
/* Special case: when ERROR_FILE_EXISTS happens and UV_FS_O_CREAT was
* specified, it means the path referred to a directory. */
SET_REQ_UV_ERROR(req, UV_EISDIR, error);
} else {
SET_REQ_WIN32_ERROR(req, GetLastError());
}
return;
}
fd = _open_osfhandle((intptr_t) file, flags);
if (fd < 0) {
/* The only known failure mode for _open_osfhandle() is EMFILE, in which
* case GetLastError() will return zero. However we'll try to handle other
* errors as well, should they ever occur.
*/
if (errno == EMFILE)
SET_REQ_UV_ERROR(req, UV_EMFILE, ERROR_TOO_MANY_OPEN_FILES);
else if (GetLastError() != ERROR_SUCCESS)
SET_REQ_WIN32_ERROR(req, GetLastError());
else
SET_REQ_WIN32_ERROR(req, (DWORD) UV_UNKNOWN);
CloseHandle(file);
return;
}
if (flags & UV_FS_O_FILEMAP) {
FILE_STANDARD_INFO file_info;
if (!GetFileInformationByHandleEx(file,
FileStandardInfo,
&file_info,
sizeof file_info)) {
SET_REQ_WIN32_ERROR(req, GetLastError());
CloseHandle(file);
return;
}
fd_info.is_directory = file_info.Directory;
if (fd_info.is_directory) {
fd_info.size.QuadPart = 0;
fd_info.mapping = INVALID_HANDLE_VALUE;
} else {
if (!GetFileSizeEx(file, &fd_info.size)) {
SET_REQ_WIN32_ERROR(req, GetLastError());
CloseHandle(file);
return;
}
if (fd_info.size.QuadPart == 0) {
fd_info.mapping = INVALID_HANDLE_VALUE;
} else {
DWORD flProtect = (fd_info.flags & (UV_FS_O_RDONLY | UV_FS_O_WRONLY |
UV_FS_O_RDWR)) == UV_FS_O_RDONLY ? PAGE_READONLY : PAGE_READWRITE;
fd_info.mapping = CreateFileMapping(file,
NULL,
flProtect,
fd_info.size.HighPart,
fd_info.size.LowPart,
NULL);
if (fd_info.mapping == NULL) {
SET_REQ_WIN32_ERROR(req, GetLastError());
CloseHandle(file);
return;
}
}
}
uv__fd_hash_add(fd, &fd_info);
}
SET_REQ_RESULT(req, fd);
return;
einval:
SET_REQ_UV_ERROR(req, UV_EINVAL, ERROR_INVALID_PARAMETER);
}
void fs__close(uv_fs_t* req) {
int fd = req->file.fd;
int result;
struct uv__fd_info_s fd_info;
VERIFY_FD(fd, req);
if (uv__fd_hash_remove(fd, &fd_info)) {
if (fd_info.mapping != INVALID_HANDLE_VALUE) {
CloseHandle(fd_info.mapping);
}
}
if (fd > 2)
result = _close(fd);
else
result = 0;
/* _close doesn't set _doserrno on failure, but it does always set errno
* to EBADF on failure.
*/
if (result == -1) {
assert(errno == EBADF);
SET_REQ_UV_ERROR(req, UV_EBADF, ERROR_INVALID_HANDLE);
} else {
SET_REQ_RESULT(req, 0);
}
}
LONG fs__filemap_ex_filter(LONG excode, PEXCEPTION_POINTERS pep,
int* perror) {
if (excode != (LONG)EXCEPTION_IN_PAGE_ERROR) {
return EXCEPTION_CONTINUE_SEARCH;
}
assert(perror != NULL);
if (pep != NULL && pep->ExceptionRecord != NULL &&
pep->ExceptionRecord->NumberParameters >= 3) {
NTSTATUS status = (NTSTATUS)pep->ExceptionRecord->ExceptionInformation[3];
*perror = pRtlNtStatusToDosError(status);
if (*perror != ERROR_SUCCESS) {
return EXCEPTION_EXECUTE_HANDLER;
}
}
*perror = UV_UNKNOWN;
return EXCEPTION_EXECUTE_HANDLER;
}
void fs__read_filemap(uv_fs_t* req, struct uv__fd_info_s* fd_info) {
int fd = req->file.fd; /* VERIFY_FD done in fs__read */
int rw_flags = fd_info->flags &
(UV_FS_O_RDONLY | UV_FS_O_WRONLY | UV_FS_O_RDWR);
size_t read_size, done_read;
unsigned int index;
LARGE_INTEGER pos, end_pos;
size_t view_offset;
LARGE_INTEGER view_base;
void* view;
if (rw_flags == UV_FS_O_WRONLY) {
SET_REQ_WIN32_ERROR(req, ERROR_ACCESS_DENIED);
return;
}
if (fd_info->is_directory) {
SET_REQ_WIN32_ERROR(req, ERROR_INVALID_FUNCTION);
return;
}
if (req->fs.info.offset == -1) {
pos = fd_info->current_pos;
} else {
pos.QuadPart = req->fs.info.offset;
}
/* Make sure we wont read past EOF. */
if (pos.QuadPart >= fd_info->size.QuadPart) {
SET_REQ_RESULT(req, 0);
return;
}
read_size = 0;
for (index = 0; index < req->fs.info.nbufs; ++index) {
read_size += req->fs.info.bufs[index].len;
}
read_size = (size_t) MIN((LONGLONG) read_size,
fd_info->size.QuadPart - pos.QuadPart);
if (read_size == 0) {
SET_REQ_RESULT(req, 0);
return;
}
end_pos.QuadPart = pos.QuadPart + read_size;
view_offset = pos.QuadPart % uv__allocation_granularity;
view_base.QuadPart = pos.QuadPart - view_offset;
view = MapViewOfFile(fd_info->mapping,
FILE_MAP_READ,
view_base.HighPart,
view_base.LowPart,
view_offset + read_size);
if (view == NULL) {
SET_REQ_WIN32_ERROR(req, GetLastError());
return;
}
done_read = 0;
for (index = 0;
index < req->fs.info.nbufs && done_read < read_size;
++index) {
size_t this_read_size = MIN(req->fs.info.bufs[index].len,
read_size - done_read);
#ifdef _MSC_VER
int err = 0;
__try {
#endif
memcpy(req->fs.info.bufs[index].base,
(char*)view + view_offset + done_read,
this_read_size);
#ifdef _MSC_VER
}
__except (fs__filemap_ex_filter(GetExceptionCode(),
GetExceptionInformation(), &err)) {
SET_REQ_WIN32_ERROR(req, err);
UnmapViewOfFile(view);
return;
}
#endif
done_read += this_read_size;
}
assert(done_read == read_size);
if (!UnmapViewOfFile(view)) {
SET_REQ_WIN32_ERROR(req, GetLastError());
return;
}
if (req->fs.info.offset == -1) {
fd_info->current_pos = end_pos;
uv__fd_hash_add(fd, fd_info);
}
SET_REQ_RESULT(req, read_size);
return;
}
void fs__read(uv_fs_t* req) {
int fd = req->file.fd;
int64_t offset = req->fs.info.offset;
HANDLE handle;
OVERLAPPED overlapped, *overlapped_ptr;
LARGE_INTEGER offset_;
DWORD bytes;
DWORD error;
int result;
unsigned int index;
LARGE_INTEGER original_position;
LARGE_INTEGER zero_offset;
int restore_position;
struct uv__fd_info_s fd_info;
VERIFY_FD(fd, req);
if (uv__fd_hash_get(fd, &fd_info)) {
fs__read_filemap(req, &fd_info);
return;
}
zero_offset.QuadPart = 0;
restore_position = 0;
handle = uv__get_osfhandle(fd);
if (handle == INVALID_HANDLE_VALUE) {
SET_REQ_WIN32_ERROR(req, ERROR_INVALID_HANDLE);
return;
}
if (offset != -1) {
memset(&overlapped, 0, sizeof overlapped);
overlapped_ptr = &overlapped;
if (SetFilePointerEx(handle, zero_offset, &original_position,
FILE_CURRENT)) {
restore_position = 1;
}
} else {
overlapped_ptr = NULL;
}
index = 0;
bytes = 0;
do {
DWORD incremental_bytes;
if (offset != -1) {
offset_.QuadPart = offset + bytes;
overlapped.Offset = offset_.LowPart;
overlapped.OffsetHigh = offset_.HighPart;
}
result = ReadFile(handle,
req->fs.info.bufs[index].base,
req->fs.info.bufs[index].len,
&incremental_bytes,
overlapped_ptr);
bytes += incremental_bytes;
++index;
} while (result && index < req->fs.info.nbufs);
if (restore_position)
SetFilePointerEx(handle, original_position, NULL, FILE_BEGIN);
if (result || bytes > 0) {
SET_REQ_RESULT(req, bytes);
} else {
error = GetLastError();
if (error == ERROR_HANDLE_EOF) {
SET_REQ_RESULT(req, bytes);
} else {
SET_REQ_WIN32_ERROR(req, error);
}
}
}
void fs__write_filemap(uv_fs_t* req, HANDLE file,
struct uv__fd_info_s* fd_info) {
int fd = req->file.fd; /* VERIFY_FD done in fs__write */
int force_append = fd_info->flags & UV_FS_O_APPEND;
int rw_flags = fd_info->flags &
(UV_FS_O_RDONLY | UV_FS_O_WRONLY | UV_FS_O_RDWR);
size_t write_size, done_write;
unsigned int index;
LARGE_INTEGER pos, end_pos;
size_t view_offset;
LARGE_INTEGER view_base;
void* view;
FILETIME ft;
if (rw_flags == UV_FS_O_RDONLY) {
SET_REQ_WIN32_ERROR(req, ERROR_ACCESS_DENIED);
return;
}
if (fd_info->is_directory) {
SET_REQ_WIN32_ERROR(req, ERROR_INVALID_FUNCTION);
return;
}
write_size = 0;
for (index = 0; index < req->fs.info.nbufs; ++index) {
write_size += req->fs.info.bufs[index].len;
}
if (write_size == 0) {
SET_REQ_RESULT(req, 0);
return;
}
if (force_append) {
pos = fd_info->size;
} else if (req->fs.info.offset == -1) {
pos = fd_info->current_pos;
} else {
pos.QuadPart = req->fs.info.offset;
}
end_pos.QuadPart = pos.QuadPart + write_size;
/* Recreate the mapping to enlarge the file if needed */
if (end_pos.QuadPart > fd_info->size.QuadPart) {
if (fd_info->mapping != INVALID_HANDLE_VALUE) {
CloseHandle(fd_info->mapping);
}
fd_info->mapping = CreateFileMapping(file,
NULL,
PAGE_READWRITE,
end_pos.HighPart,
end_pos.LowPart,
NULL);
if (fd_info->mapping == NULL) {
SET_REQ_WIN32_ERROR(req, GetLastError());
CloseHandle(file);
fd_info->mapping = INVALID_HANDLE_VALUE;
fd_info->size.QuadPart = 0;
fd_info->current_pos.QuadPart = 0;
uv__fd_hash_add(fd, fd_info);
return;
}
fd_info->size = end_pos;
uv__fd_hash_add(fd, fd_info);
}
view_offset = pos.QuadPart % uv__allocation_granularity;
view_base.QuadPart = pos.QuadPart - view_offset;
view = MapViewOfFile(fd_info->mapping,
FILE_MAP_WRITE,
view_base.HighPart,
view_base.LowPart,
view_offset + write_size);
if (view == NULL) {