Bug 1478146 - Use SetFilePointerEx in nsLocalFileWin.cpp r=nika

Differential Revision: https://phabricator.services.mozilla.com/D142883
This commit is contained in:
Nathan Froyd 2022-04-04 20:39:04 +00:00
Родитель a207cf0c45
Коммит 45d38d17c1
1 изменённых файлов: 4 добавлений и 16 удалений

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@ -339,20 +339,6 @@ static nsresult ConvertWinError(DWORD aWinErr) {
return rv; return rv;
} }
// as suggested in the MSDN documentation on SetFilePointer
static __int64 MyFileSeek64(HANDLE aHandle, __int64 aDistance,
DWORD aMoveMethod) {
LARGE_INTEGER li;
li.QuadPart = aDistance;
li.LowPart = SetFilePointer(aHandle, li.LowPart, &li.HighPart, aMoveMethod);
if (li.LowPart == INVALID_SET_FILE_POINTER && GetLastError() != NO_ERROR) {
li.QuadPart = -1;
}
return li.QuadPart;
}
// Check whether a path is a volume root. Expects paths to be \-terminated. // Check whether a path is a volume root. Expects paths to be \-terminated.
static bool IsRootPath(const nsAString& aPath) { static bool IsRootPath(const nsAString& aPath) {
// Easy cases first: // Easy cases first:
@ -2646,8 +2632,10 @@ nsLocalFile::SetFileSize(int64_t aFileSize) {
// seek the file pointer to the new, desired end of file // seek the file pointer to the new, desired end of file
// and then truncate the file at that position // and then truncate the file at that position
nsresult rv = NS_ERROR_FAILURE; nsresult rv = NS_ERROR_FAILURE;
aFileSize = MyFileSeek64(hFile, aFileSize, FILE_BEGIN); LARGE_INTEGER distance;
if (aFileSize != -1 && SetEndOfFile(hFile)) { distance.QuadPart = aFileSize;
if (SetFilePointerEx(hFile, distance, nullptr, FILE_BEGIN) &&
SetEndOfFile(hFile)) {
MakeDirty(); MakeDirty();
rv = NS_OK; rv = NS_OK;
} }