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

runtime/bin/file_win.cc

Index: runtime/bin/file_win.cc
diff --git a/runtime/bin/file_win.cc b/runtime/bin/file_win.cc
index 8e0f6157157ecec66e600990691f647515e833a4..d8c471c3fbc3fc3193d70f49ace94fe5bdd50ca7 100644
--- a/runtime/bin/file_win.cc
+++ b/runtime/bin/file_win.cc
@@ -72,19 +72,19 @@ int64_t File::Write(const void* buffer, int64_t num_bytes) {
 }
 
 
-off_t File::Position() {
+off64_t File::Position() {
   ASSERT(handle_->fd() >= 0);
   return lseek(handle_->fd(), 0, SEEK_CUR);

[Søren Gjesse, 2013/11/19 10:15:49]

Looking in the Windows docs
(http://msdn.microsoft.com/en-us/library/1yee101t(v=vs.100).aspx) we should use
_lseek64 here.

[Anders Johnsen, 2013/11/19 10:43:39]

Done.

 }
 
 
-bool File::SetPosition(int64_t position) {
+bool File::SetPosition(off64_t position) {
   ASSERT(handle_->fd() >= 0);
   return (lseek(handle_->fd(), position, SEEK_SET) != -1);

[Søren Gjesse, 2013/11/19 10:15:49]

ditto

[Anders Johnsen, 2013/11/19 10:43:39]

Done.

 }
 
 
-bool File::Truncate(int64_t length) {
+bool File::Truncate(off64_t length) {
   ASSERT(handle_->fd() >= 0);
   return (chsize(handle_->fd(), length) != -1);

[Søren Gjesse, 2013/11/19 10:15:49]

Use _chsize_s here
(http://msdn.microsoft.com/en-us/library/whx354w1(v=vs.100).aspx).

[Anders Johnsen, 2013/11/19 10:43:39]

Done.

 }
@@ -96,7 +96,7 @@ bool File::Flush() {
 }
 
 
-off_t File::Length() {
+off64_t File::Length() {
   ASSERT(handle_->fd() >= 0);
   struct stat st;
   if (fstat(handle_->fd(), &st) == 0) {

[Søren Gjesse, 2013/11/19 10:15:49]

And _fstat64 (http://msdn.microsoft.com/en-us/library/221w8e43(v=vs.100).aspx).

[Anders Johnsen, 2013/11/19 10:43:39]

Done.

@@ -322,7 +322,7 @@ bool File::RenameLink(const char* old_path, const char* new_path) {
 }
 
 
-off_t File::LengthFromPath(const char* name) {
+off64_t File::LengthFromPath(const char* name) {
   struct _stat st;
   const wchar_t* system_name = StringUtils::Utf8ToWide(name);
   int stat_status = _wstat(system_name, &st);

[Søren Gjesse, 2013/11/19 10:15:49]

_wstat64

[Anders Johnsen, 2013/11/19 10:43:39]

Done.