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make sparse_end support unbuffered files

This commit is contained in:
Arvid Norberg 2012-01-21 23:24:24 +00:00
parent 4706807300
commit f23607bc05
1 changed files with 14 additions and 3 deletions
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13
src/file.cpp
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@ -1812,13 +1812,24 @@ typedef struct _FILE_ALLOCATED_RANGE_BUFFER {
error_code ec;
size_type file_size = get_size(ec);
if (ec) return start;
if (m_open_mode & no_buffer)
{
boost::uint64_t mask = size_alignment()-1;
in.FileOffset.QuadPart = start & (~mask);
in.Length.QuadPart = ((file_size + mask) & ~mask) - in.FileOffset.QuadPart;
TORRENT_ASSERT((in.Length.QuadPart & mask) == 0);
}
else
{
in.FileOffset.QuadPart = start;
in.Length.QuadPart = file_size - start;
}
if (!DeviceIoControl(m_file_handle, FSCTL_QUERY_ALLOCATED_RANGES
, &in, sizeof(FILE_ALLOCATED_RANGE_BUFFER)
, &buffer, sizeof(FILE_ALLOCATED_RANGE_BUFFER), &bytes_returned, 0))
{
int err = GetLastError();
if (GetLastError() != ERROR_INSUFFICIENT_BUFFER) return start;
}