file_io.h

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 * $Id: file_io.h 3751 2011-12-31 23:18:12Z rusu $
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#ifndef PCL_IO_FILE_IO_H_
#define PCL_IO_FILE_IO_H_

#include <pcl/pcl_macros.h>
#include <pcl/common/io.h>
#include <boost/numeric/conversion/cast.hpp>
#include <cmath>
#include <sstream>

namespace pcl
{
  class PCL_EXPORTS FileReader
  {
    public:
      FileReader() {}
      virtual ~FileReader() {}
      virtual int 
      readHeader (const std::string &file_name, sensor_msgs::PointCloud2 &cloud, 
                  Eigen::Vector4f &origin, Eigen::Quaternionf &orientation, int &file_version,
                  int &data_type, int &data_idx) = 0;

      virtual int 
      read (const std::string &file_name, sensor_msgs::PointCloud2 &cloud, 
            Eigen::Vector4f &origin, Eigen::Quaternionf &orientation, int &file_version) = 0;

      int 
      read (const std::string &file_name, sensor_msgs::PointCloud2 &cloud)
      {
        Eigen::Vector4f origin;
        Eigen::Quaternionf orientation;
        int file_version;
        return read(file_name, cloud, origin, orientation, file_version);
      }

      template<typename PointT> inline int
      read (const std::string &file_name, pcl::PointCloud<PointT> &cloud)
      {
        sensor_msgs::PointCloud2 blob;
        int file_version;
        int res = read (file_name, blob, cloud.sensor_origin_, cloud.sensor_orientation_, 
                        file_version);

        // Exit in case of error
        if (res < 0)
          return res;
        pcl::fromROSMsg (blob, cloud);
        return 0;
      }

      template <typename Type> inline void
      copyStringValue (const std::string &st, sensor_msgs::PointCloud2 &cloud,
                       unsigned int point_index, unsigned int field_idx, unsigned int fields_count)
      {
        Type value;
        if (st == "nan")
        {
          value = std::numeric_limits<Type>::quiet_NaN ();
          cloud.is_dense = false;
        }
        else
        {
          std::istringstream is(st);
          is.imbue (std::locale::classic ());
          is >> value;
        }

        memcpy (&cloud.data[point_index * cloud.point_step + 
                            cloud.fields[field_idx].offset + 
                            fields_count * sizeof (Type)], (char*)&value, sizeof (Type));
      }

  };

  class PCL_EXPORTS FileWriter
  {
    public:
      FileWriter () {}

      virtual ~FileWriter () {}

      virtual int
      write (const std::string &file_name, const sensor_msgs::PointCloud2 &cloud, 
             const Eigen::Vector4f &origin = Eigen::Vector4f::Zero (), 
             const Eigen::Quaternionf &orientation = Eigen::Quaternionf::Identity (),
             const bool binary = false) = 0;

      inline int
      write (const std::string &file_name, const sensor_msgs::PointCloud2::ConstPtr &cloud, 
             const Eigen::Vector4f &origin = Eigen::Vector4f::Zero (), 
             const Eigen::Quaternionf &orientation = Eigen::Quaternionf::Identity (),
             const bool binary = false)
      {
        return (write (file_name, *cloud, origin, orientation, binary));
      }

      template<typename PointT> inline int
      write (const std::string &file_name, 
             const pcl::PointCloud<PointT> &cloud, 
             const bool binary = false)
      {
        Eigen::Vector4f origin = cloud.sensor_origin_;
        Eigen::Quaternionf orientation = cloud.sensor_orientation_;

        sensor_msgs::PointCloud2 blob;
        pcl::toROSMsg (cloud, blob);

        // Save the data
        return (write (file_name, blob, origin, orientation, binary));
      }
  };

  template <typename Type> inline void
  copyValueString (const sensor_msgs::PointCloud2 &cloud, 
                   const unsigned int point_index, 
                   const int point_size, 
                   const unsigned int field_idx, 
                   const unsigned int fields_count, 
                   std::ostream &stream)
  {
    Type value;
    memcpy (&value, &cloud.data[point_index * point_size + cloud.fields[field_idx].offset + fields_count * sizeof (Type)], sizeof (Type));
    if (pcl_isnan (value))
      stream << "nan";
    else
      stream << boost::numeric_cast<Type>(value);
  }
  template <> inline void
  copyValueString<int8_t> (const sensor_msgs::PointCloud2 &cloud, 
                           const unsigned int point_index, 
                           const int point_size, 
                           const unsigned int field_idx, 
                           const unsigned int fields_count, 
                           std::ostream &stream)
  {
    int8_t value;
    memcpy (&value, &cloud.data[point_index * point_size + cloud.fields[field_idx].offset + fields_count * sizeof (int8_t)], sizeof (int8_t));
    if (pcl_isnan (value))
      stream << "nan";
    else
      // Numeric cast doesn't give us what we want for int8_t
      stream << boost::numeric_cast<int>(value);
  }
  template <> inline void
  copyValueString<uint8_t> (const sensor_msgs::PointCloud2 &cloud, 
                            const unsigned int point_index, 
                            const int point_size, 
                            const unsigned int field_idx, 
                            const unsigned int fields_count, 
                            std::ostream &stream)
  {
    uint8_t value;
    memcpy (&value, &cloud.data[point_index * point_size + cloud.fields[field_idx].offset + fields_count * sizeof (uint8_t)], sizeof (uint8_t));
    if (pcl_isnan (value))
      stream << "nan";
    else
      // Numeric cast doesn't give us what we want for uint8_t
      stream << boost::numeric_cast<int>(value);
  }
}

#endif  //#ifndef PCL_IO_FILE_IO_H_