This file is indexed.

/usr/share/psychtoolbox-3/PsychHardware/BitsPlusToolbox/BitsPlusClut2Texture.m is in psychtoolbox-3-common 3.0.11.20131230.dfsg1-1build1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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function texturePtr = BitsPlusClut2Texture(windowPtr, clut)
% texturePtr = BitsPlusClut2Texture(windowPtr, clut)
%
%   Generates a PsychToolbox texture containing the CLUT + magic code
%   required to set the clut in Bits++ mode.
%
%   'clut' should be a 256x3 matrix consisting of values in the range
%   specified by Screen('ColorRange'), which is by default [0, 255].

if nargin ~= 2
    error('Usage: texturePtr = BitsPlusClut2Texture(windowPtr, clut)');
end

% Convert the clut into the current color range.
colorRange = Screen('ColorRange', windowPtr);
clut = clut / colorRange .* (2^16 - 1);

% Convert the clut into the special one for Bits++.
newClutRow = BitsPlusEncodeClutRow(clut);

% Generate the texture holding the Bits++ clut.
texturePtr = Screen('MakeTexture', windowPtr, uint8(newClutRow));