Modified version of lib3ds reader of .3ds format

#include "Lib3ds_camera.h"

#include <math.h>

Lib3ds_camera::Lib3ds_camera()
{
}

/*!
 * Return a new Lib3dsCamera object.
 *
 * Object is initialized with the given name and fov=45.  All other
 * values are 0.
 *
 * \param name Name of this camera.  Must not be NULL.  Must be < 64 characters.
 *
 * \return Lib3dsCamera object or NULL on failure.
 */
Lib3dsCamera Lib3ds_camera::lib3ds_camera_new(QString name)
{
    Lib3dsCamera camera;

    memset(&camera.setting, 0, sizeof(Lib3dsCamera_setting));

    camera.name = name;

    camera.setting.fov = 45.0f;

    return camera;
}


/*!
 * Read a camera definition from a file.
 *
 * This function is called by lib3ds_file_read(), and you probably
 * don't want to call it directly.
 *
 * \param camera A Lib3dsCamera to be filled in.
 * \param io A Lib3dsIo object previously set up by the caller.
 *
 * \see lib3ds_file_read
 */
bool Lib3ds_camera::lib3ds_camera_read(Lib3dsCamera *camera)
{
    Lib3dsChunk c;
    uint16_t chunk;

    if(!lib3ds_chunk_read_start(&c, CHK_N_CAMERA))
    {
        return false;
    }

    {
        int i;
        for (i = 0; i < 3; ++i)
        {
            camera->setting.position[i] = lib3ds_io_read_float();
        }
        for (i = 0; i < 3; ++i)
        {
            camera->setting.target[i] = lib3ds_io_read_float();
        }
    }
    camera->setting.roll = lib3ds_io_read_float();
    {
        float s;

        s = lib3ds_io_read_float();

        if (fabs(s) < LIB3DS_EPSILON)
        {
            camera->setting.fov = 45.0;
        }
        else
        {
            camera->setting.fov = 2400.0f / s;
        }
    }
    lib3ds_chunk_read_tell(&c);

    while ((chunk = lib3ds_chunk_read_next(&c)) != 0)
    {
        switch (chunk)
        {
            case CHK_CAM_SEE_CONE:
            {
                camera->setting.see_cone = TRUE;
            }
            break;

            case CHK_CAM_RANGES:
            {
                camera->setting.near_range = lib3ds_io_read_float();
                camera->setting.far_range = lib3ds_io_read_float();
            }
            break;

            default:
                lib3ds_chunk_unknown(chunk);
        }
    }

    lib3ds_chunk_read_end(&c);

    return true;
}