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_writer(string file_name, bool compress)
{
if(file_name==null||file_name.Length==0)
{
error="string file_name pointer is zero";
return 1;
}
if(reader!=null)
{
error="reader is already open";
return 1;
}
if(writer!=null)
{
error="writer is already open";
return 1;
}
try
{
#region check header and prepare point
uint vlrs_size=0;
if(header.version_major!=1)
{
error=string.Format("unknown LAS version {0}.{1}", header.version_major, header.version_minor);
return 1;
}
if(compress&&(header.point_data_format>5))
{
error=string.Format("compressor does not yet support point data format {1}", header.point_data_format);
return 1;
}
if(header.number_of_variable_length_records!=0)
{
if(header.vlrs==null)
{
error=string.Format("number_of_variable_length_records is {0} but vlrs pointer is zero", header.number_of_variable_length_records);
return 1;
}
for(int i=0; i<header.number_of_variable_length_records; i++)
{
vlrs_size+=54;
if(header.vlrs[i].record_length_after_header!=0)
{
if(header.vlrs==null)
{
error=string.Format("vlrs[{0}].record_length_after_header is {1} but vlrs[{0}].data pointer is zero", i, header.vlrs[i].record_length_after_header);
return 1;
}
vlrs_size+=header.vlrs[i].record_length_after_header;
}
}
}
if((vlrs_size+header.header_size+header.user_data_after_header_size)!=header.offset_to_point_data)
{
error=string.Format("header_size ({0}) plus vlrs_size ({1}) plus user_data_after_header_size ({2}) does not equal offset_to_point_data ({3})", header.header_size, vlrs_size, header.user_data_after_header_size, header.offset_to_point_data);
return 1;
}
LASzip laszip=null;
try
{
laszip=new LASzip();
}
catch
{
error="could not alloc LASzip";
return 1;
}
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;
}
#region create point's item pointers
for(uint 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;
}
}
#endregion
uint laszip_vrl_payload_size=0;
if(compress)
{
if(!laszip.setup(header.point_data_format, header.point_data_record_length, LASzip.COMPRESSOR_DEFAULT))
{
error=string.Format("cannot compress point_data_format {0} with point_data_record_length {1}", header.point_data_format, header.point_data_record_length);
return 1;
}
laszip.request_version(2);
laszip_vrl_payload_size=34u+6u*laszip.num_items;
}
else
{
laszip.request_version(0);
}
#endregion
#region open the file
try
{
streamout=new FileStream(file_name, FileMode.Create, FileAccess.Write, FileShare.Read);
}
catch
{
error=string.Format("cannot open file '{0}'", file_name);
return 1;
}
#endregion
#region write the header variable after variable
try
{
streamout.WriteByte((byte)'L');
streamout.WriteByte((byte)'A');
streamout.WriteByte((byte)'S');
streamout.WriteByte((byte)'F');
}
catch
{
error="writing header.file_signature";
return 1;
}
try { streamout.Write(BitConverter.GetBytes(header.file_source_ID), 0, 2); }
catch { error="writing header.file_source_ID"; return 1; }
try { streamout.Write(BitConverter.GetBytes(header.global_encoding), 0, 2); }
catch { error="writing header.global_encoding"; return 1; }
try { streamout.Write(BitConverter.GetBytes(header.project_ID_GUID_data_1), 0, 4); }
catch { error="writing header.project_ID_GUID_data_1"; return 1; }
try { streamout.Write(BitConverter.GetBytes(header.project_ID_GUID_data_2), 0, 2); }
catch { error="writing header.project_ID_GUID_data_2"; return 1; }
try { streamout.Write(BitConverter.GetBytes(header.project_ID_GUID_data_3), 0, 2); }
catch { error="writing header.project_ID_GUID_data_3"; return 1; }
try { streamout.Write(header.project_ID_GUID_data_4, 0, 8); }
catch { error="writing header.project_ID_GUID_data_4"; return 1; }
try { streamout.WriteByte(header.version_major); }
catch { error="writing header.version_major"; return 1; }
try { streamout.WriteByte(header.version_minor); }
catch { error="writing header.version_minor"; return 1; }
try { streamout.Write(header.system_identifier, 0, 32); }
catch { error="writing header.system_identifier"; return 1; }
byte[] generatingSoftware=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(generatingSoftware, header.generating_software, Math.Min(generatingSoftware.Length, 32));
try { streamout.Write(header.generating_software, 0, 32); }
catch { error="writing header.generating_software"; return 1; }
try { streamout.Write(BitConverter.GetBytes(header.file_creation_day), 0, 2); }
catch { error="writing header.file_creation_day"; return 1; }
try { streamout.Write(BitConverter.GetBytes(header.file_creation_year), 0, 2); }
catch { error="writing header.file_creation_year"; return 1; }
try { streamout.Write(BitConverter.GetBytes(header.header_size), 0, 2); }
catch { error="writing header.header_size"; return 1; }
if(compress) header.offset_to_point_data+=(54+laszip_vrl_payload_size);
try { streamout.Write(BitConverter.GetBytes(header.offset_to_point_data), 0, 4); }
catch { error="writing header.offset_to_point_data"; return 1; }
if(compress)
{
header.offset_to_point_data-=(54+laszip_vrl_payload_size);
header.number_of_variable_length_records+=1;
}
try { streamout.Write(BitConverter.GetBytes(header.number_of_variable_length_records), 0, 4); }
catch { error="writing header.number_of_variable_length_records"; return 1; }
if(compress)
{
header.number_of_variable_length_records-=1;
header.point_data_format|=128;
}
try { streamout.WriteByte(header.point_data_format); }
catch { error="writing header.point_data_format"; return 1; }
if(compress) header.point_data_format&=127;
try { streamout.Write(BitConverter.GetBytes(header.point_data_record_length), 0, 2); }
catch { error="writing header.point_data_record_length"; return 1; }
try { streamout.Write(BitConverter.GetBytes(header.number_of_point_records), 0, 4); }
catch { error="writing header.number_of_point_records"; return 1; }
for(uint i=0; i<5; i++)
{
try { streamout.Write(BitConverter.GetBytes(header.number_of_points_by_return[i]), 0, 4); }
catch { error=string.Format("writing header.number_of_points_by_return {0}", i); return 1; }
}
try { streamout.Write(BitConverter.GetBytes(header.x_scale_factor), 0, 8); }
catch { error="writing header.x_scale_factor"; return 1; }
try { streamout.Write(BitConverter.GetBytes(header.y_scale_factor), 0, 8); }
catch { error="writing header.y_scale_factor"; return 1; }
try { streamout.Write(BitConverter.GetBytes(header.z_scale_factor), 0, 8); }
catch { error="writing header.z_scale_factor"; return 1; }
try { streamout.Write(BitConverter.GetBytes(header.x_offset), 0, 8); }
catch { error="writing header.x_offset"; return 1; }
try { streamout.Write(BitConverter.GetBytes(header.y_offset), 0, 8); }
catch { error="writing header.y_offset"; return 1; }
try { streamout.Write(BitConverter.GetBytes(header.z_offset), 0, 8); }
catch { error="writing header.z_offset"; return 1; }
try { streamout.Write(BitConverter.GetBytes(header.max_x), 0, 8); }
catch { error="writing header.max_x"; return 1; }
try { streamout.Write(BitConverter.GetBytes(header.min_x), 0, 8); }
catch { error="writing header.min_x"; return 1; }
try { streamout.Write(BitConverter.GetBytes(header.max_y), 0, 8); }
catch { error="writing header.max_y"; return 1; }
try { streamout.Write(BitConverter.GetBytes(header.min_y), 0, 8); }
catch { error="writing header.min_y"; return 1; }
try { streamout.Write(BitConverter.GetBytes(header.max_z), 0, 8); }
catch { error="writing header.max_z"; return 1; }
try { streamout.Write(BitConverter.GetBytes(header.min_z), 0, 8); }
catch { error="writing header.min_z"; return 1; }
#region 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;
}
try { streamout.Write(BitConverter.GetBytes(header.start_of_waveform_data_packet_record), 0, 8); }
catch { error="writing header.start_of_waveform_data_packet_record"; return 1; }
header.user_data_in_header_size=header.header_size-235u;
}
else header.user_data_in_header_size=header.header_size-227u;
#endregion
#region 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;
}
try { streamout.Write(BitConverter.GetBytes(header.start_of_first_extended_variable_length_record), 0, 8); }
catch { error="writing header.start_of_first_extended_variable_length_record"; return 1; }
try { streamout.Write(BitConverter.GetBytes(header.number_of_extended_variable_length_records), 0, 4); }
catch { error="writing header.number_of_extended_variable_length_records"; return 1; }
try { streamout.Write(BitConverter.GetBytes(header.extended_number_of_point_records), 0, 8); }
catch { error="writing header.extended_number_of_point_records"; return 1; }
for(uint i=0; i<15; i++)
{
try { streamout.Write(BitConverter.GetBytes(header.extended_number_of_points_by_return[i]), 0, 8); }
catch { error=string.Format("writing header.extended_number_of_points_by_return[{0}]", i); return 1; }
}
header.user_data_in_header_size=header.header_size-375u;
}
#endregion
#region write any number of user-defined bytes that might have been added to the header
if(header.user_data_in_header_size!=0)
{
try { streamout.Write(header.user_data_in_header, 0, (int)header.user_data_in_header_size); }
catch { error=string.Format("writing {0} bytes of data into header.user_data_in_header", header.user_data_in_header_size); return 1; }
}
#endregion
#region write variable length records into the header
if(header.number_of_variable_length_records!=0)
{
for(int i=0; i<header.number_of_variable_length_records; i++)
{
// write variable length records variable after variable (to avoid alignment issues)
try { streamout.Write(BitConverter.GetBytes(header.vlrs[i].reserved), 0, 2); }
catch { error=string.Format("writing header.vlrs[{0}].reserved", i); return 1; }
try { streamout.Write(header.vlrs[i].user_id, 0, 16); }
catch { error=string.Format("writing header.vlrs[{0}].user_id", i); return 1; }
try { streamout.Write(BitConverter.GetBytes(header.vlrs[i].record_id), 0, 2); }
catch { error=string.Format("writing header.vlrs[{0}].record_id", i); return 1; }
try { streamout.Write(BitConverter.GetBytes(header.vlrs[i].record_length_after_header), 0, 2); }
catch { error=string.Format("writing header.vlrs[{0}].record_length_after_header", i); return 1; }
try { streamout.Write(header.vlrs[i].description, 0, 32); }
catch { error=string.Format("writing header.vlrs[{0}].description", i); return 1; }
// write data following the header of the variable length record
if(header.vlrs[i].record_length_after_header!=0)
{
try { streamout.Write(header.vlrs[i].data, 0, header.vlrs[i].record_length_after_header); }
catch { error=string.Format("writing {0} bytes of data into header.vlrs[{1}].data", header.vlrs[i].record_length_after_header, i); return 1; }
}
}
}
if(compress)
{
#region write the LASzip VLR header
uint i=header.number_of_variable_length_records;
ushort reserved=0xAABB;
try { streamout.Write(BitConverter.GetBytes(reserved), 0, 2); }
catch { error=string.Format("writing header.vlrs[{0}].reserved", i); return 1; }
byte[] user_id1=Encoding.ASCII.GetBytes("laszip encoded");
byte[] user_id=new byte[16];
Array.Copy(user_id1, user_id, Math.Min(16, user_id1.Length));
try { streamout.Write(user_id, 0, 16); }
catch { error=string.Format("writing header.vlrs[{0}].user_id", i); return 1; }
ushort record_id=22204;
try { streamout.Write(BitConverter.GetBytes(record_id), 0, 2); }
catch { error=string.Format("writing header.vlrs[{0}].record_id", i); return 1; }
ushort record_length_after_header=(ushort)laszip_vrl_payload_size;
try { streamout.Write(BitConverter.GetBytes(record_length_after_header), 0, 2); }
catch { error=string.Format("writing header.vlrs[{0}].record_length_after_header", i); return 1; }
byte[] description1=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));
byte[] description=new byte[32];
try { streamout.Write(description, 0, 32); }
catch { error=string.Format("writing header.vlrs[{0}].description", i); return 1; }
// write 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
try { streamout.Write(BitConverter.GetBytes(laszip.compressor), 0, 2); }
catch { error=string.Format("writing compressor {0}", laszip.compressor); return 1; }
try { streamout.Write(BitConverter.GetBytes(laszip.coder), 0, 2); }
catch { error=string.Format("writing coder {0}", laszip.coder); return 1; }
try { streamout.WriteByte(laszip.version_major); }
catch { error=string.Format("writing version_major {0}", laszip.version_major); return 1; }
try { streamout.WriteByte(laszip.version_minor); }
catch { error=string.Format("writing version_minor {0}", laszip.version_minor); return 1; }
try { streamout.Write(BitConverter.GetBytes(laszip.version_revision), 0, 2); }
catch { error=string.Format("writing version_revision {0}", laszip.version_revision); return 1; }
try { streamout.Write(BitConverter.GetBytes(laszip.options), 0, 4); }
catch { error=string.Format("writing options {0}", laszip.options); return 1; }
try { streamout.Write(BitConverter.GetBytes(laszip.chunk_size), 0, 4); }
catch { error=string.Format("writing chunk_size {0}", laszip.chunk_size); return 1; }
try { streamout.Write(BitConverter.GetBytes(laszip.number_of_special_evlrs), 0, 8); }
catch { error=string.Format("writing number_of_special_evlrs {0}", laszip.number_of_special_evlrs); return 1; }
try { streamout.Write(BitConverter.GetBytes(laszip.offset_to_special_evlrs), 0, 8); }
catch { error=string.Format("writing offset_to_special_evlrs {0}", laszip.offset_to_special_evlrs); return 1; }
try { streamout.Write(BitConverter.GetBytes(laszip.num_items), 0, 2); }
catch { error=string.Format("writing num_items {0}", laszip.num_items); return 1; }
for(uint j=0; j<laszip.num_items; j++)
{
ushort type=(ushort)laszip.items[j].type;
try { streamout.Write(BitConverter.GetBytes(type), 0, 2); }
catch { error=string.Format("writing type {0} of item {1}", laszip.items[j].type, j); return 1; }
try { streamout.Write(BitConverter.GetBytes(laszip.items[j].size), 0, 2); }
catch { error=string.Format("writing size {0} of item {1}", laszip.items[j].size, j); return 1; }
try { streamout.Write(BitConverter.GetBytes(laszip.items[j].version), 0, 2); }
catch { error=string.Format("writing version {0} of item {1}", laszip.items[j].version, j); return 1; }
}
#endregion
}
#endregion
#region write any number of user-defined bytes that might have been added after the header
if(header.user_data_after_header_size!=0)
{
try { streamout.Write(header.user_data_after_header, 0, (int)header.user_data_after_header_size); }
catch { error=string.Format("writing {0} bytes of data into header.user_data_after_header", header.user_data_after_header_size); return 1; }
}
#endregion
#endregion
#region create the point writer
try { writer=new LASwritePoint(); }
catch { error="could not alloc LASwritePoint"; return 1; }
if(!writer.setup(laszip.num_items, laszip.items, laszip))
{
error="setup of LASwritePoint failed";
return 1;
}
if(!writer.init(streamout))
{
error="init of LASwritePoint failed";
return 1;
}
#endregion
// set the point number and point count
npoints=header.number_of_point_records;
p_count=0;
}
catch
{
error=string.Format("internal error in laszip_open_writer '{0}'", file_name);
return 1;
}
error=null;
return 0;
}
public int laszip_close_writer()
{
if(writer==null)
{
error="closing writer before it was opened";
return 1;
}
try
{
if(!writer.done())
{
error="done of LASwritePoint failed";
return 1;
}
writer=null;
streamout.Close();
streamout=null;
}
catch
{
error="internal error in laszip_writer_close";
return 1;
}
error=null;
return 0;
}