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Returns int64 value in function of seeking to file end on x64 Windows. #1057

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Merged
merged 1 commit into from
Mar 15, 2019
Merged

Returns int64 value in function of seeking to file end on x64 Windows. #1057

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9 changes: 8 additions & 1 deletion Release/include/cpprest/filestream.h
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Original file line number Diff line number Diff line change
Expand Up @@ -649,12 +649,19 @@ class basic_file_buffer : public details::streambuf_state_manager<_CharType>
if (mode == std::ios_base::in)
{
m_readOps.wait();
size_t current_pos = static_cast<size_t>(-1);
switch (way)
{
case std::ios_base::beg: return (pos_type)_seekrdpos_fsb(m_info, size_t(offset), sizeof(_CharType));
case std::ios_base::cur:
return (pos_type)_seekrdpos_fsb(m_info, size_t(m_info->m_rdpos + offset), sizeof(_CharType));
case std::ios_base::end: return (pos_type)_seekrdtoend_fsb(m_info, int64_t(offset), sizeof(_CharType));
case std::ios_base::end:
current_pos = _seekrdtoend_fsb(m_info, int64_t(offset), sizeof(_CharType));
if (current_pos == static_cast<size_t>(-1))
{
return -1;
}
return (pos_type)current_pos;
default:
// Fail on invalid input (_S_ios_seekdir_end)
assert(false);
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15 changes: 15 additions & 0 deletions Release/src/streams/fileio_win32.cpp
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Expand Up @@ -905,11 +905,26 @@ size_t __cdecl _seekrdtoend_fsb(_In_ streams::details::_file_info* info, int64_t
fInfo->m_bufoff = fInfo->m_buffill = fInfo->m_bufsize = 0;
}

#ifdef _WIN64
LARGE_INTEGER filesize;
filesize.QuadPart = 0;

BOOL result = GetFileSizeEx(fInfo->m_handle, &filesize);
if (FALSE == result)
{
return static_cast<size_t>(-1);
}
else
{
fInfo->m_rdpos = static_cast<size_t>(filesize.QuadPart) / char_size;
}
#else
auto newpos = SetFilePointer(fInfo->m_handle, (LONG)(offset * char_size), nullptr, FILE_END);

if (newpos == INVALID_SET_FILE_POINTER) return static_cast<size_t>(-1);

fInfo->m_rdpos = static_cast<size_t>(newpos) / char_size;
#endif

return fInfo->m_rdpos;
}
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