public int laszip_set_geoascii_params(ushort number, byte[] geoascii_params)
{
if(number==0)
{
error="number of geoascii_params is zero";
return 1;
}
if(geoascii_params==null)
{
error="geoascii_params pointer is zero";
return 1;
}
if(reader!=null)
{
error="cannot set geoascii_params after reader was opened";
return 1;
}
if(writer!=null)
{
error="cannot set geoascii_params after writer was opened";
return 1;
}
try
{
// fill a VLR
laszip_vlr vlr=new laszip_vlr();
vlr.reserved=0xAABB;
Array.Copy(Encoding.ASCII.GetBytes("LASF_Projection"), vlr.user_id, 16);
vlr.record_id=34737;
vlr.record_length_after_header=number;
byte[] v=Encoding.ASCII.GetBytes(string.Format("LASzip DLL {0}.{1} r{2} ({3})", LASzip.VERSION_MAJOR, LASzip.VERSION_MINOR, LASzip.VERSION_REVISION, LASzip.VERSION_BUILD_DATE));
Array.Copy(v, vlr.description, Math.Min(v.Length, 32));
vlr.data=geoascii_params;
// add the VLR
if(laszip_add_vlr(vlr)!=0)
{
error=string.Format("setting {0} geoascii_params", number);
return 1;
}
}
catch
{
error="internal error in laszip_set_geoascii_params";
return 1;
}
error=null;
return 0;
}
public int laszip_add_vlr(laszip_vlr vlr)
{
if(vlr==null)
{
error="laszip_vlr_struct vlr pointer is zero";
return 1;
}
if((vlr.record_length_after_header>0)&&(vlr.data==null))
{
error=string.Format("VLR has record_length_after_header of {0} but VLR data pointer is zero", vlr.record_length_after_header);
return 1;
}
if(reader!=null)
{
error="cannot add vlr after reader was opened";
return 1;
}
if(writer!=null)
{
error="cannot add vlr after writer was opened";
return 1;
}
try
{
if(header.vlrs.Count>0)
{
// overwrite existing VLR ?
for(int i=(int)header.number_of_variable_length_records-1; i>=0; i++)
{
if(header.vlrs[i].record_id==vlr.record_id&&!ArrayCompare(header.vlrs[i].user_id, vlr.user_id))
{
if(header.vlrs[i].record_length_after_header!=0)
header.offset_to_point_data-=header.vlrs[i].record_length_after_header;
header.vlrs.RemoveAt(i);
}
}
}
header.vlrs.Add(vlr);
header.number_of_variable_length_records=(uint)header.vlrs.Count;
header.offset_to_point_data+=54;
// copy the VLR
header.offset_to_point_data+=vlr.record_length_after_header;
}
catch
{
error="internal error in laszip_add_vlr";
return 1;
}
error=null;
return 0;
}
public unsafe int laszip_set_geokeys(ushort number, laszip_geokey[] key_entries)
{
if(number==0)
{
error="number of key_entries is zero";
return 1;
}
if(key_entries==null)
{
error="key_entries pointer is zero";
return 1;
}
if(reader!=null)
{
error="cannot set geokeys after reader was opened";
return 1;
}
if(writer!=null)
{
error="cannot set geokeys after writer was opened";
return 1;
}
try
{
// create the geokey directory
byte[] buffer=new byte[sizeof(laszip_geokey)*(number+1)];
fixed(byte* pBuffer=buffer)
{
laszip_geokey* key_entries_plus_one=(laszip_geokey*)pBuffer;
key_entries_plus_one[0].key_id=1; // aka key_directory_version
key_entries_plus_one[0].tiff_tag_location=1; // aka key_revision
key_entries_plus_one[0].count=0; // aka minor_revision
key_entries_plus_one[0].value_offset=number; // aka number_of_keys
for(int i=0; i<number; i++) key_entries_plus_one[i+1]=key_entries[i];
}
// fill a VLR
laszip_vlr vlr=new laszip_vlr();
vlr.reserved=0xAABB;
Array.Copy(Encoding.ASCII.GetBytes("LASF_Projection"), vlr.user_id, 16);
vlr.record_id=34735;
vlr.record_length_after_header=(ushort)(8+number*8);
byte[] v=Encoding.ASCII.GetBytes(string.Format("LASzip DLL {0}.{1} r{2} ({3})", LASzip.VERSION_MAJOR, LASzip.VERSION_MINOR, LASzip.VERSION_REVISION, LASzip.VERSION_BUILD_DATE));
Array.Copy(v, vlr.description, Math.Min(v.Length, 32));
vlr.data=buffer;
// add the VLR
if(laszip_add_vlr(vlr)!=0)
{
error=string.Format("setting {0} geokeys", number);
return 1;
}
}
catch
{
error="internal error in laszip_set_geokey_entries";
return 1;
}
error=null;
return 0;
}
