/usr/include/CharLS/lookuptable.h is in libcharls-dev 1.1.0+dfsg-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// (C) Jan de Vaan 2007-2010, all rights reserved. See the accompanying "License.txt" for licensed use.
//
#ifndef CHARLS_LOOKUPTABLE
#define CHARLS_LOOKUPTABLE
// Tables for fast decoding of short Golomb Codes.
struct Code
{
Code()
{
}
Code(LONG value, LONG length) :
_value(value),
_length(length)
{
}
LONG GetValue() const
{ return _value; }
LONG GetLength() const
{ return _length; }
LONG _value;
LONG _length;
};
class CTable
{
public:
enum { cbit = 8 } ;
CTable()
{
::memset(rgtype, 0, sizeof(rgtype));
}
void AddEntry(BYTE bvalue, Code c);
inlinehint const Code& Get(LONG value)
{ return rgtype[value]; }
private:
Code rgtype[1 << cbit];
};
//
// AddEntry
//
void CTable::AddEntry(BYTE bvalue, Code c)
{
LONG length = c.GetLength();
ASSERT(length <= cbit);
for (LONG i = 0; i < LONG(1) << (cbit - length); ++i)
{
ASSERT(rgtype[(bvalue << (cbit - length)) + i].GetLength() == 0);
rgtype[(bvalue << (cbit - length)) + i] = c;
}
}
#endif
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