Add support for working with large files, in dart:io.

runtime/bin/file_win.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "platform/globals.h"
 #if defined(TARGET_OS_WINDOWS)
 
 #include "bin/file.h"
 
 #include <fcntl.h>  // NOLINT
@@ skipping 54 matching lines @@
   return read(handle_->fd(), buffer, num_bytes);
 }
 
 
 int64_t File::Write(const void* buffer, int64_t num_bytes) {
   ASSERT(handle_->fd() >= 0);
   return write(handle_->fd(), buffer, num_bytes);
 }
 
 
-off_t File::Position() {
+off64_t File::Position() {
   ASSERT(handle_->fd() >= 0);
-  return lseek(handle_->fd(), 0, SEEK_CUR);
+  return _lseeki64(handle_->fd(), 0, SEEK_CUR);
 }
 
 
-bool File::SetPosition(int64_t position) {
+bool File::SetPosition(off64_t position) {
   ASSERT(handle_->fd() >= 0);
-  return (lseek(handle_->fd(), position, SEEK_SET) != -1);
+  return _lseeki64(handle_->fd(), position, SEEK_SET) >= 0;
 }
 
 
-bool File::Truncate(int64_t length) {
+bool File::Truncate(off64_t length) {
   ASSERT(handle_->fd() >= 0);
-  return (chsize(handle_->fd(), length) != -1);
+  return (_chsize_s(handle_->fd(), length) != -1);
 }
 
 
 bool File::Flush() {
   ASSERT(handle_->fd());
   return _commit(handle_->fd()) != -1;
 }
 
 
-off_t File::Length() {
+off64_t File::Length() {
   ASSERT(handle_->fd() >= 0);
-  struct stat st;
-  if (fstat(handle_->fd(), &st) == 0) {
+  struct __stat64 st;
+  if (_fstat64(handle_->fd(), &st) == 0) {
     return st.st_size;
   }
   return -1;
 }
 
 
 File* File::Open(const char* name, FileOpenMode mode) {
   int flags = O_RDONLY | O_BINARY | O_NOINHERIT;
   if ((mode & kWrite) != 0) {
     flags = (O_RDWR | O_CREAT | O_BINARY | O_NOINHERIT);
   }
   if ((mode & kTruncate) != 0) {
     flags = flags | O_TRUNC;
   }
   const wchar_t* system_name = StringUtils::Utf8ToWide(name);
   int fd = _wopen(system_name, flags, 0666);
   free(const_cast<wchar_t*>(system_name));
   if (fd < 0) {
     return NULL;
   }
   if (((mode & kWrite) != 0) && ((mode & kTruncate) == 0)) {
-    int position = lseek(fd, 0, SEEK_END);
+    off64_t position = _lseeki64(fd, 0, SEEK_END);
     if (position < 0) {
       return NULL;
     }
   }
   return new File(new FileHandle(fd));
 }
 
 
 File* File::OpenStdio(int fd) {
   UNREACHABLE();
   return NULL;
 }
 
 
 bool File::Exists(const char* name) {
-  struct _stat st;
+  struct __stat64 st;
   const wchar_t* system_name = StringUtils::Utf8ToWide(name);
-  bool stat_status = _wstat(system_name, &st);
+  bool stat_status = _wstat64(system_name, &st);
   free(const_cast<wchar_t*>(system_name));
   if (stat_status == 0) {
     return ((st.st_mode & S_IFMT) == S_IFREG);
   } else {
     return false;
   }
 }
 
 
 bool File::Create(const char* name) {
@@ skipping 162 matching lines @@
     free(const_cast<wchar_t*>(system_old_path));
     free(const_cast<wchar_t*>(system_new_path));
     return (move_status != 0);
   } else {
     SetLastError(ERROR_FILE_NOT_FOUND);
   }
   return false;
 }
 
 
-off_t File::LengthFromPath(const char* name) {
-  struct _stat st;
+off64_t File::LengthFromPath(const char* name) {
+  struct __stat64 st;
   const wchar_t* system_name = StringUtils::Utf8ToWide(name);
-  int stat_status = _wstat(system_name, &st);
+  int stat_status = _wstat64(system_name, &st);
   free(const_cast<wchar_t*>(system_name));
   if (stat_status == 0) {
     return st.st_size;
   }
   return -1;
 }
 
 
 char* File::LinkTarget(const char* pathname) {
   const wchar_t* name = StringUtils::Utf8ToWide(pathname);
@@ skipping 102 matching lines @@
       data[kMode] = st.st_mode;
       data[kSize] = st.st_size;
     } else {
       data[kType] = File::kDoesNotExist;
     }
   }
 }
 
 
 time_t File::LastModified(const char* name) {
-  struct _stat st;
+  struct __stat64 st;
   const wchar_t* system_name = StringUtils::Utf8ToWide(name);
-  int stat_status = _wstat(system_name, &st);
+  int stat_status = _wstat64(system_name, &st);
   free(const_cast<wchar_t*>(system_name));
   if (stat_status == 0) {
     return st.st_mtime;
   }
   return -1;
 }
 
 
 bool File::IsAbsolutePath(const char* pathname) {
   // Should we consider network paths?
@@ skipping 142 matching lines @@
     return kIdentical;
   } else {
     return kDifferent;
   }
 }
 
 }  // namespace bin
 }  // namespace dart
 
 #endif  // defined(TARGET_OS_WINDOWS)