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applied NSPR Bug 1586070 - Read does not advance file position for files larger than 4GB on Win32. (See also bug 70765.) r=kaie

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This commit is contained in:
Roy Tam 2019-11-22 11:04:45 +08:00
commit 97ea6ee957
1 changed files with 9 additions and 1 deletions
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10
nsprpub/pr/src/md/windows/ntio.c
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@ -2171,6 +2171,7 @@ _PR_MD_READ(PRFileDesc *fd, void *buf, PRInt32 len)
int rv, err;
LONG hiOffset = 0;
LONG loOffset;
LARGE_INTEGER offset; /* use for a normalized add of len to offset */
if (!fd->secret->md.sync_file_io) {
PRThread *me = _PR_MD_CURRENT_THREAD();
@ -2286,7 +2287,14 @@ _PR_MD_READ(PRFileDesc *fd, void *buf, PRInt32 len)
return -1;
}
SetFilePointer((HANDLE)f, me->md.blocked_io_bytes, 0, FILE_CURRENT);
/* Apply the workaround from bug 70765 (see _PR_MD_WRITE)
* to the reading code, too. */
offset.LowPart = me->md.overlapped.overlapped.Offset;
offset.HighPart = me->md.overlapped.overlapped.OffsetHigh;
offset.QuadPart += me->md.blocked_io_bytes;
SetFilePointer((HANDLE)f, offset.LowPart, &offset.HighPart, FILE_BEGIN);
PR_ASSERT(me->io_pending == PR_FALSE);