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tablebase file checks (#1911) #1927

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tablebase file checks (#1911) #1927

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fb84530
tablebase file checks (#1911)
vondele Jan 3, 2019
9bdd6a3
fixup
vondele Jan 4, 2019
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4 changes: 3 additions & 1 deletion Readme.md
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Original file line number Diff line number Diff line change
Expand Up @@ -86,7 +86,9 @@ Currently, Stockfish has the following UCI options:
Example: `C:\tablebases\wdl345;C:\tablebases\wdl6;D:\tablebases\dtz345;D:\tablebases\dtz6`

It is recommended to store .rtbw files on an SSD. There is no loss in storing
the .rtbz files on a regular HD.
the .rtbz files on a regular HD. It is recommended to verify all md5 checksums of the
downloaded tablebase files (`md5sum -c checksum.md5`) as corruption will lead to
engine crashes.

* #### SyzygyProbeDepth
Minimum remaining search depth for which a position is probed. Set this option
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10 changes: 10 additions & 0 deletions src/syzygy/tbprobe.cpp
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Expand Up @@ -214,6 +214,11 @@ class TBFile : public std::ifstream {
return *baseAddress = nullptr, nullptr;

fstat(fd, &statbuf);
if (statbuf.st_size % 64 != 16)
{
std::cerr << "Corrupt tablebase file " << fname << std::endl;
exit(1);
}
*mapping = statbuf.st_size;
*baseAddress = mmap(nullptr, statbuf.st_size, PROT_READ, MAP_SHARED, fd, 0);
madvise(*baseAddress, statbuf.st_size, MADV_RANDOM);
Expand All @@ -233,6 +238,11 @@ class TBFile : public std::ifstream {

DWORD size_high;
DWORD size_low = GetFileSize(fd, &size_high);
if (size_low % 64 != 16)
{
std::cerr << "Corrupt tablebase file " << fname << std::endl;
exit(1);
}
HANDLE mmap = CreateFileMapping(fd, nullptr, PAGE_READONLY, size_high, size_low, nullptr);
CloseHandle(fd);

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