public int laszip_close_reader()
{
if(reader==null)
{
error="closing reader before it was opened";
return 1;
}
try
{
if(!reader.done())
{
error="done of LASreadPoint failed";
return 1;
}
reader=null;
streamin.Close();
streamin=null;
}
catch
{
error="internal error in laszip_close_reader";
return 1;
}
error=null;
return 0;
}
public int laszip_clean()
{
try
{
if(reader!=null)
{
error="cannot clean while reader is open.";
return 1;
}
if(writer!=null)
{
error="cannot clean while writer is open.";
return 1;
}
// zero everything
header.file_source_ID=0;
header.global_encoding=0;
header.project_ID_GUID_data_1=0;
header.project_ID_GUID_data_2=0;
header.project_ID_GUID_data_3=0;
header.project_ID_GUID_data_4=new byte[8];
header.version_major=0;
header.version_minor=0;
header.system_identifier=new byte[32];
header.generating_software=new byte[32];
header.file_creation_day=0;
header.file_creation_year=0;
header.header_size=0;
header.offset_to_point_data=0;
header.number_of_variable_length_records=0;
header.point_data_format=0;
header.point_data_record_length=0;
header.number_of_point_records=0;
header.number_of_points_by_return=new uint[5];
header.x_scale_factor=0;
header.y_scale_factor=0;
header.z_scale_factor=0;
header.x_offset=0;
header.y_offset=0;
header.z_offset=0;
header.max_x=0;
header.min_x=0;
header.max_y=0;
header.min_y=0;
header.max_z=0;
header.min_z=0;
header.start_of_waveform_data_packet_record=0;
header.start_of_first_extended_variable_length_record=0;
header.number_of_extended_variable_length_records=0;
header.extended_number_of_point_records=0;
header.extended_number_of_points_by_return=new ulong[15];
header.user_data_in_header_size=0;
header.user_data_in_header=null;
header.vlrs=null;
header.user_data_after_header_size=0;
header.user_data_after_header=null;
p_count=0;
npoints=0;
point.X=0;
point.Y=0;
point.Z=0;
point.intensity=0;
point.return_number=0;// : 3;
point.number_of_returns_of_given_pulse=0;// : 3;
point.scan_direction_flag=0;// : 1;
point.edge_of_flight_line=0;// : 1;
point.classification=0;
point.scan_angle_rank=0;
point.user_data=0;
point.point_source_ID=0;
point.gps_time=0;
point.rgb=new ushort[4];
point.wave_packet=new byte[29];
point.extended_point_type=0;// : 2;
point.extended_scanner_channel=0;// : 2;
point.extended_classification_flags=0;// : 4;
point.extended_classification=0;
point.extended_return_number=0;// : 4;
point.extended_number_of_returns_of_given_pulse=0;// : 4;
point.extended_scan_angle=0;
point.num_extra_bytes=0;
point.extra_bytes=null;
streamin=null;
reader=null;
streamout=null;
writer=null;
error=null;
warning=null;
// create default header
Array.Copy(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)), header.generating_software, 32);
header.version_major=1;
header.version_minor=2;
header.header_size=227;
header.offset_to_point_data=227;
header.point_data_format=1;
header.point_data_record_length=28;
header.x_scale_factor=0.01;
header.y_scale_factor=0.01;
header.z_scale_factor=0.01;
}
catch
{
error="internal error in laszip_clean";
return 1;
}
return 0;
}
public int laszip_open_reader(Stream stream, ref bool is_compressed)
{
if (stream == null)
{
error = "file stream is empty";
return 1;
}
streamin = stream;
try
{
byte[] buffer=new byte[32];
#region read the header variable after variable
if(streamin.Read(buffer, 0, 4)!=4)
{
error="reading header.file_signature";
return 1;
}
if(buffer[0]!='L'&&buffer[1]!='A'&&buffer[2]!='S'&&buffer[3]!='F')
{
error="wrong file_signature. not a LAS/LAZ file.";
return 1;
}
if(streamin.Read(buffer, 0, 2)!=2)
{
error="reading header.file_source_ID";
return 1;
}
header.file_source_ID=BitConverter.ToUInt16(buffer, 0);
if(streamin.Read(buffer, 0, 2)!=2)
{
error="reading header.global_encoding";
return 1;
}
header.global_encoding=BitConverter.ToUInt16(buffer, 0);
if(streamin.Read(buffer, 0, 4)!=4)
{
error="reading header.project_ID_GUID_data_1";
return 1;
}
header.project_ID_GUID_data_1=BitConverter.ToUInt32(buffer, 0);
if(streamin.Read(buffer, 0, 2)!=2)
{
error="reading header.project_ID_GUID_data_2";
return 1;
}
header.project_ID_GUID_data_2=BitConverter.ToUInt16(buffer, 0);
if(streamin.Read(buffer, 0, 2)!=2)
{
error="reading header.project_ID_GUID_data_3";
return 1;
}
header.project_ID_GUID_data_3=BitConverter.ToUInt16(buffer, 0);
if(streamin.Read(header.project_ID_GUID_data_4, 0, 8)!=8)
{
error="reading header.project_ID_GUID_data_4";
return 1;
}
if(streamin.Read(buffer, 0, 1)!=1)
{
error="reading header.version_major";
return 1;
}
header.version_major=buffer[0];
if(streamin.Read(buffer, 0, 1)!=1)
{
error="reading header.version_minor";
return 1;
}
header.version_minor=buffer[0];
if(streamin.Read(header.system_identifier, 0, 32)!=32)
{
error="reading header.system_identifier";
return 1;
}
if(streamin.Read(header.generating_software, 0, 32)!=32)
{
error="reading header.generating_software";
return 1;
}
if(streamin.Read(buffer, 0, 2)!=2)
{
error="reading header.file_creation_day";
return 1;
}
header.file_creation_day=BitConverter.ToUInt16(buffer, 0);
if(streamin.Read(buffer, 0, 2)!=2)
{
error="reading header.file_creation_year";
return 1;
}
header.file_creation_year=BitConverter.ToUInt16(buffer, 0);
if(streamin.Read(buffer, 0, 2)!=2)
{
error="reading header.header_size";
return 1;
}
header.header_size=BitConverter.ToUInt16(buffer, 0);
if(streamin.Read(buffer, 0, 4)!=4)
{
error="reading header.offset_to_point_data";
return 1;
}
header.offset_to_point_data=BitConverter.ToUInt32(buffer, 0);
if(streamin.Read(buffer, 0, 4)!=4)
{
error="reading header.number_of_variable_length_records";
return 1;
}
header.number_of_variable_length_records=BitConverter.ToUInt32(buffer, 0);
if(streamin.Read(buffer, 0, 1)!=1)
{
error="reading header.point_data_format";
return 1;
}
header.point_data_format=buffer[0];
if(streamin.Read(buffer, 0, 2)!=2)
{
error="reading header.point_data_record_length";
return 1;
}
header.point_data_record_length=BitConverter.ToUInt16(buffer, 0);
if(streamin.Read(buffer, 0, 4)!=4)
{
error="reading header.number_of_point_records";
return 1;
}
header.number_of_point_records=BitConverter.ToUInt32(buffer, 0);
for(int i=0; i<5; i++)
{
if(streamin.Read(buffer, 0, 4)!=4)
{
error=string.Format("reading header.number_of_points_by_return {0}", i);
return 1;
}
header.number_of_points_by_return[i]=BitConverter.ToUInt32(buffer, 0);
}
if(streamin.Read(buffer, 0, 8)!=8)
{
error="reading header.x_scale_factor";
return 1;
}
header.x_scale_factor=BitConverter.ToDouble(buffer, 0);
if(streamin.Read(buffer, 0, 8)!=8)
{
error="reading header.y_scale_factor";
return 1;
}
header.y_scale_factor=BitConverter.ToDouble(buffer, 0);
if(streamin.Read(buffer, 0, 8)!=8)
{
error="reading header.z_scale_factor";
return 1;
}
header.z_scale_factor=BitConverter.ToDouble(buffer, 0);
if(streamin.Read(buffer, 0, 8)!=8)
{
error="reading header.x_offset";
return 1;
}
header.x_offset=BitConverter.ToDouble(buffer, 0);
if(streamin.Read(buffer, 0, 8)!=8)
{
error="reading header.y_offset";
return 1;
}
header.y_offset=BitConverter.ToDouble(buffer, 0);
if(streamin.Read(buffer, 0, 8)!=8)
{
error="reading header.z_offset";
return 1;
}
header.z_offset=BitConverter.ToDouble(buffer, 0);
if(streamin.Read(buffer, 0, 8)!=8)
{
error="reading header.max_x";
return 1;
}
header.max_x=BitConverter.ToDouble(buffer, 0);
if(streamin.Read(buffer, 0, 8)!=8)
{
error="reading header.min_x";
return 1;
}
header.min_x=BitConverter.ToDouble(buffer, 0);
if(streamin.Read(buffer, 0, 8)!=8)
{
error="reading header.max_y";
return 1;
}
header.max_y=BitConverter.ToDouble(buffer, 0);
if(streamin.Read(buffer, 0, 8)!=8)
{
error="reading header.min_y";
return 1;
}
header.min_y=BitConverter.ToDouble(buffer, 0);
if(streamin.Read(buffer, 0, 8)!=8)
{
error="reading header.max_z";
return 1;
}
header.max_z=BitConverter.ToDouble(buffer, 0);
if(streamin.Read(buffer, 0, 8)!=8)
{
error="reading header.min_z";
return 1;
}
header.min_z=BitConverter.ToDouble(buffer, 0);
// special handling for LAS 1.3
if((header.version_major==1)&&(header.version_minor>=3))
{
if(header.header_size<235)
{
error=string.Format("for LAS 1.{0} header_size should at least be 235 but it is only {1}", header.version_minor, header.header_size);
return 1;
}
else
{
if(streamin.Read(buffer, 0, 8)!=8)
{
error="reading header.start_of_waveform_data_packet_record";
return 1;
}
header.start_of_waveform_data_packet_record=BitConverter.ToUInt64(buffer, 0);
header.user_data_in_header_size=(uint)header.header_size-235;
}
}
else
{
header.user_data_in_header_size=(uint)header.header_size-227;
}
// special handling for LAS 1.4
if((header.version_major==1)&&(header.version_minor>=4))
{
if(header.header_size<375)
{
error=string.Format("for LAS 1.{0} header_size should at least be 375 but it is only {1}", header.version_minor, header.header_size);
return 1;
}
else
{
if(streamin.Read(buffer, 0, 8)!=8)
{
error="reading header.start_of_first_extended_variable_length_record";
return 1;
}
header.start_of_first_extended_variable_length_record=BitConverter.ToUInt64(buffer, 0);
if(streamin.Read(buffer, 0, 4)!=4)
{
error="reading header.number_of_extended_variable_length_records";
return 1;
}
header.number_of_extended_variable_length_records=BitConverter.ToUInt32(buffer, 0);
if(streamin.Read(buffer, 0, 8)!=8)
{
error="reading header.extended_number_of_point_records";
return 1;
}
header.extended_number_of_point_records=BitConverter.ToUInt64(buffer, 0);
for(int i=0; i<15; i++)
{
if(streamin.Read(buffer, 0, 8)!=8)
{
error=string.Format("reading header.extended_number_of_points_by_return[{0}]", i);
return 1;
}
header.extended_number_of_points_by_return[i]=BitConverter.ToUInt64(buffer, 0);
}
header.user_data_in_header_size=(uint)header.header_size-375;
}
}
// load any number of user-defined bytes that might have been added to the header
if(header.user_data_in_header_size!=0)
{
header.user_data_in_header=new byte[header.user_data_in_header_size];
if(streamin.Read(header.user_data_in_header, 0, (int)header.user_data_in_header_size)!=header.user_data_in_header_size)
{
error=string.Format("reading {0} bytes of data into header.user_data_in_header", header.user_data_in_header_size);
return 1;
}
}
#endregion
#region read variable length records into the header
uint vlrs_size=0;
LASzip laszip=null;
if(header.number_of_variable_length_records!=0)
{
header.vlrs=new List<laszip_vlr>();
for(int i=0; i<header.number_of_variable_length_records; i++)
{
header.vlrs.Add(new laszip_vlr());
// make sure there are enough bytes left to read a variable length record before the point block starts
if(((int)header.offset_to_point_data-vlrs_size-header.header_size)<54)
{
warning=string.Format("only {0} bytes until point block after reading {1} of {2} vlrs. skipping remaining vlrs ...", (int)header.offset_to_point_data-vlrs_size-header.header_size, i, header.number_of_variable_length_records);
header.number_of_variable_length_records=(uint)i;
break;
}
// read variable length records variable after variable (to avoid alignment issues)
if(streamin.Read(buffer, 0, 2)!=2)
{
error=string.Format("reading header.vlrs[{0}].reserved", i);
return 1;
}
header.vlrs[i].reserved=BitConverter.ToUInt16(buffer, 0);
if(streamin.Read(header.vlrs[i].user_id, 0, 16)!=16)
{
error=string.Format("reading header.vlrs[{0}].user_id", i);
return 1;
}
if(streamin.Read(buffer, 0, 2)!=2)
{
error=string.Format("reading header.vlrs[{0}].record_id", i);
return 1;
}
header.vlrs[i].record_id=BitConverter.ToUInt16(buffer, 0);
if(streamin.Read(buffer, 0, 2)!=2)
{
error=string.Format("reading header.vlrs[{0}].record_length_after_header", i);
return 1;
}
header.vlrs[i].record_length_after_header=BitConverter.ToUInt16(buffer, 0);
if(streamin.Read(header.vlrs[i].description, 0, 32)!=32)
{
error=string.Format("reading header.vlrs[{0}].description", i);
return 1;
}
// keep track on the number of bytes we have read so far
vlrs_size+=54;
// check variable length record contents
if(header.vlrs[i].reserved!=0xAABB)
{
warning=string.Format("wrong header.vlrs[{0}].reserved: {1} != 0xAABB", i, header.vlrs[i].reserved);
}
// make sure there are enough bytes left to read the data of the variable length record before the point block starts
if(((int)header.offset_to_point_data-vlrs_size-header.header_size)<header.vlrs[i].record_length_after_header)
{
warning=string.Format("only {0} bytes until point block when trying to read {1} bytes into header.vlrs[{2}].data", (int)header.offset_to_point_data-vlrs_size-header.header_size, header.vlrs[i].record_length_after_header, i);
header.vlrs[i].record_length_after_header=(ushort)(header.offset_to_point_data-vlrs_size-header.header_size);
}
string userid="";
for(int a=0; a<header.vlrs[i].user_id.Length; a++)
{
if(header.vlrs[i].user_id[a]==0) break;
userid+=(char)header.vlrs[i].user_id[a];
}
// load data following the header of the variable length record
if(header.vlrs[i].record_length_after_header!=0)
{
if(userid=="laszip encoded")
{
laszip=new LASzip();
// read the LASzip VLR payload
// U16 compressor 2 bytes
// U32 coder 2 bytes
// U8 version_major 1 byte
// U8 version_minor 1 byte
// U16 version_revision 2 bytes
// U32 options 4 bytes
// I32 chunk_size 4 bytes
// I64 number_of_special_evlrs 8 bytes
// I64 offset_to_special_evlrs 8 bytes
// U16 num_items 2 bytes
// U16 type 2 bytes * num_items
// U16 size 2 bytes * num_items
// U16 version 2 bytes * num_items
// which totals 34+6*num_items
if(streamin.Read(buffer, 0, 2)!=2)
{
error="reading compressor";
return 1;
}
laszip.compressor=BitConverter.ToUInt16(buffer, 0);
if(streamin.Read(buffer, 0, 2)!=2)
{
error="reading coder";
return 1;
}
laszip.coder=BitConverter.ToUInt16(buffer, 0);
if(streamin.Read(buffer, 0, 1)!=1)
{
error="reading version_major";
return 1;
}
laszip.version_major=buffer[0];
if(streamin.Read(buffer, 0, 1)!=1)
{
error="reading version_minor";
return 1;
}
laszip.version_minor=buffer[0];
if(streamin.Read(buffer, 0, 2)!=2)
{
error="reading version_revision";
return 1;
}
laszip.version_revision=BitConverter.ToUInt16(buffer, 0);
if(streamin.Read(buffer, 0, 4)!=4)
{
error="reading options";
return 1;
}
laszip.options=BitConverter.ToUInt32(buffer, 0);
if(streamin.Read(buffer, 0, 4)!=4)
{
error="reading chunk_size";
return 1;
}
laszip.chunk_size=BitConverter.ToUInt32(buffer, 0);
if(streamin.Read(buffer, 0, 8)!=8)
{
error="reading number_of_special_evlrs";
return 1;
}
laszip.number_of_special_evlrs=BitConverter.ToInt64(buffer, 0);
if(streamin.Read(buffer, 0, 8)!=8)
{
error="reading offset_to_special_evlrs";
return 1;
}
laszip.offset_to_special_evlrs=BitConverter.ToInt64(buffer, 0);
if(streamin.Read(buffer, 0, 2)!=2)
{
error="reading num_items";
return 1;
}
laszip.num_items=BitConverter.ToUInt16(buffer, 0);
laszip.items=new LASitem[laszip.num_items];
for(int j=0; j<laszip.num_items; j++)
{
laszip.items[j]=new LASitem();
if(streamin.Read(buffer, 0, 2)!=2)
{
error=string.Format("reading type of item {0}", j);
return 1;
}
laszip.items[j].type=(LASitem.Type)BitConverter.ToUInt16(buffer, 0);
if(streamin.Read(buffer, 0, 2)!=2)
{
error=string.Format("reading size of item {0}", j);
return 1;
}
laszip.items[j].size=BitConverter.ToUInt16(buffer, 0);
if(streamin.Read(buffer, 0, 2)!=2)
{
error=string.Format("reading version of item {0}", j);
return 1;
}
laszip.items[j].version=BitConverter.ToUInt16(buffer, 0);
}
}
else
{
header.vlrs[i].data=new byte[header.vlrs[i].record_length_after_header];
if(streamin.Read(header.vlrs[i].data, 0, header.vlrs[i].record_length_after_header)!=header.vlrs[i].record_length_after_header)
{
error=string.Format("reading {0} bytes of data into header.vlrs[{1}].data", header.vlrs[i].record_length_after_header, i);
return 1;
}
}
}
else
{
header.vlrs[i].data=null;
}
// keep track on the number of bytes we have read so far
vlrs_size+=header.vlrs[i].record_length_after_header;
// special handling for LASzip VLR
if(userid=="laszip encoded")
{
// we take our the VLR for LASzip away
header.offset_to_point_data-=(uint)(54+header.vlrs[i].record_length_after_header);
vlrs_size-=(uint)(54+header.vlrs[i].record_length_after_header);
header.vlrs.RemoveAt(i);
i--;
header.number_of_variable_length_records--;
}
}
}
#endregion
// load any number of user-defined bytes that might have been added after the header
header.user_data_after_header_size=header.offset_to_point_data-vlrs_size-header.header_size;
if(header.user_data_after_header_size!=0)
{
header.user_data_after_header=new byte[header.user_data_after_header_size];
if(streamin.Read(header.user_data_after_header, 0, (int)header.user_data_after_header_size)!=header.user_data_after_header_size)
{
error=string.Format("reading {0} bytes of data into header.user_data_after_header", header.user_data_after_header_size);
return 1;
}
}
// remove extra bits in point data type
if((header.point_data_format&128)!=0||(header.point_data_format&64)!=0)
{
if(laszip==null)
{
error="this file was compressed with an experimental version of LASzip. contact '*****@*****.**' for assistance";
return 1;
}
header.point_data_format&=127;
}
// check if file is compressed
if(laszip!=null)
{
// yes. check the compressor state
is_compressed=true;
if(!laszip.check())
{
error=string.Format("{0} upgrade to the latest release of LAStools (with LASzip) or contact '*****@*****.**' for assistance", laszip.get_error());
return 1;
}
}
else
{
// no. setup an un-compressed read
is_compressed=false;
laszip=new LASzip();
if(!laszip.setup(header.point_data_format, header.point_data_record_length, LASzip.COMPRESSOR_NONE))
{
error=string.Format("invalid combination of point_data_format {0} and point_data_record_length {1}", header.point_data_format, header.point_data_record_length);
return 1;
}
}
// create point's item pointers
for(int i=0; i<laszip.num_items; i++)
{
switch(laszip.items[i].type)
{
case LASitem.Type.POINT14:
case LASitem.Type.POINT10:
case LASitem.Type.GPSTIME11:
case LASitem.Type.RGBNIR14:
case LASitem.Type.RGB12:
case LASitem.Type.WAVEPACKET13:
break;
case LASitem.Type.BYTE:
point.num_extra_bytes=laszip.items[i].size;
point.extra_bytes=new byte[point.num_extra_bytes];
break;
default:
error=string.Format("unknown LASitem type {0}", laszip.items[i].type);
return 1;
}
}
// create the point reader
reader=new LASreadPoint();
if(!reader.setup(laszip.num_items, laszip.items, laszip))
{
error="setup of LASreadPoint failed";
return 1;
}
if(!reader.init(streamin))
{
error="init of LASreadPoint failed";
return 1;
}
laszip=null;
// set the point number and point count
npoints=header.number_of_point_records;
p_count=0;
}
catch
{
error="internal error in laszip_open_reader";
return 1;
}
error=null;
return 0;
}