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io_win32: test return of GetFileSize for errors

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This commit is contained in:
Danny Robson 2018-08-23 13:59:14 +10:00
parent 058a86ba05
commit 676154d652
1 changed files with 5 additions and 1 deletions
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6
io_win32.cpp
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@ -69,7 +69,11 @@ mapped_file::mapped_file (::cruft::win32::handle &&src,
// I would rather perform checks on filesize after mapping, but mapping // I would rather perform checks on filesize after mapping, but mapping
// requires a check for empty files before we perform the mapping to // requires a check for empty files before we perform the mapping to
// detect errors it throws in that specific situation. // detect errors it throws in that specific situation.
DWORD hi_size, lo_size = GetFileSize (m_file, &hi_size); DWORD hi_size;
DWORD lo_size = GetFileSize (m_file, &hi_size);
if (lo_size == INVALID_FILE_SIZE)
::cruft::win32::error::throw_code ();
m_size = static_cast<uint64_t> (hi_size) << 32 | lo_size; m_size = static_cast<uint64_t> (hi_size) << 32 | lo_size;
m_mapping.reset ( m_mapping.reset (