This file is indexed.

/usr/include/Box2D/Rope/b2Rope.h is in libbox2d-dev 2.3.0+ds-2.

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

The actual contents of the file can be viewed below.

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
/*
* Copyright (c) 2011 Erin Catto http://www.box2d.org
*
* This software is provided 'as-is', without any express or implied
* warranty.  In no event will the authors be held liable for any damages
* arising from the use of this software.
* Permission is granted to anyone to use this software for any purpose,
* including commercial applications, and to alter it and redistribute it
* freely, subject to the following restrictions:
* 1. The origin of this software must not be misrepresented; you must not
* claim that you wrote the original software. If you use this software
* in a product, an acknowledgment in the product documentation would be
* appreciated but is not required.
* 2. Altered source versions must be plainly marked as such, and must not be
* misrepresented as being the original software.
* 3. This notice may not be removed or altered from any source distribution.
*/

#ifndef B2_ROPE_H
#define B2_ROPE_H

#include <Box2D/Common/b2Math.h>

class b2Draw;

/// 
struct b2RopeDef
{
	b2RopeDef()
	{
		vertices = NULL;
		count = 0;
		masses = NULL;
		gravity.SetZero();
		damping = 0.1f;
		k2 = 0.9f;
		k3 = 0.1f;
	}

	///
	b2Vec2* vertices;

	///
	int32 count;

	///
	float32* masses;

	///
	b2Vec2 gravity;

	///
	float32 damping;

	/// Stretching stiffness
	float32 k2;

	/// Bending stiffness. Values above 0.5 can make the simulation blow up.
	float32 k3;
};

/// 
class b2Rope
{
public:
	b2Rope();
	~b2Rope();

	///
	void Initialize(const b2RopeDef* def);

	///
	void Step(float32 timeStep, int32 iterations);

	///
	int32 GetVertexCount() const
	{
		return m_count;
	}

	///
	const b2Vec2* GetVertices() const
	{
		return m_ps;
	}

	///
	void Draw(b2Draw* draw) const;

	///
	void SetAngle(float32 angle);

private:

	void SolveC2();
	void SolveC3();

	int32 m_count;
	b2Vec2* m_ps;
	b2Vec2* m_p0s;
	b2Vec2* m_vs;

	float32* m_ims;

	float32* m_Ls;
	float32* m_as;

	b2Vec2 m_gravity;
	float32 m_damping;

	float32 m_k2;
	float32 m_k3;
};

#endif