Method read

src/lasquadtree.cpp:578–670

read from file

// read from file
BOOL LASquadtree::read(ByteStreamIn* stream)
{
  // read data in the following order
  //     U32  levels          4 bytes 
  //     U32  level_index     4 bytes (default 0)
  //     U32  implicit_levels 4 bytes (only used when level_index != 0))
  //     F32  min_x           4 bytes 
  //     F32  max_x           4 bytes 
  //     F32  min_y           4 bytes 
  //     F32  max_y           4 bytes 
  // which totals 28 bytes

  char signature[4];
  try { stream->getBytes((U8*)signature, 4); } catch(...)
  {
    laserror("(LASquadtree): reading LASspatial signature");
    return FALSE;
  }
  if (strncmp(signature, "LASS", 4) != 0)
  {
    laserror("(LASquadtree): wrong LASspatial signature %4s instead of 'LASS'", signature);
    return FALSE;
  }
  U32 type;
  try { stream->getBytes((U8*)&type, 4); } catch(...)
  {
    laserror("(LASquadtree): reading LASspatial type");
    return 0;
  }
  if (type != LAS_SPATIAL_QUAD_TREE)
  {
    laserror("(LASquadtree): unknown LASspatial type %u", type);
    return 0;
  }
  try { stream->getBytes((U8*)signature, 4); } catch(...)
  {
    laserror("(LASquadtree): reading signature");
    return FALSE;
  }
  if (strncmp(signature, "LASQ", 4) != 0)
  {
//    laserror("(LASquadtree): wrong signature %4s instead of 'LASV'", signature);
//    return FALSE;
    levels = ((U32*)signature)[0];
  }
  else
  {
    U32 version;
    try { stream->get32bitsLE((U8*)&version); } catch(...)
    {
      laserror("(LASquadtree): reading version");
      return FALSE;
    }
    try { stream->get32bitsLE((U8*)&levels); } catch(...)
    {
      laserror("(LASquadtree): reading levels");
      return FALSE;
    }