excellon_read_drill_file.cpp

Go to the documentation of this file.

/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 1992-2016 Jean-Pierre Charras <jp.charras at wanadoo.fr>
 * Copyright (C) 1992-2023 KiCad Developers, see AUTHORS.txt for contributors.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, you may find one here:
 * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
 * or you may search the http://www.gnu.org website for the version 2 license,
 * or you may write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
 */
 
/*
 * Here is a sample of drill files created by Pcbnew, in decimal format:
 * (Note: coordinates formats are same as Gerber, and T commands are near Gerber D commands).
 * M48
 * ;DRILL file {PCBnew (2011-03-14 BZR 2894)-testing} date 15/03/2011 14:23:22
 * ;FORMAT={-:-/ absolute / inch / decimal}
 * FMAT,2
 * INCH,TZ
 * T1C0.02
 * T2C0.032
 * %
 * G90
 * G05
 * M72
 * T1
 * X1.580Y-1.360
 * X1.580Y-4.860
 * X8.680Y-1.360
 * X8.680Y-4.860
 * T2
 * X2.930Y-3.560
 * X5.280Y-2.535
 * X5.405Y-2.610
 * X5.620Y-2.900
 * T0
 * M30
 */
 /*
 * Note there are some variant of tool definition:
 * T1F00S00C0.2 or T1C0.02F00S00 ... Feed Rate and Spindle Speed of Tool 1
 * Feed Rate and Spindle Speed are just skipped because they are not used in a viewer
 */
 
#include <math/util.h> // for KiROUND
#include <trigo.h> // for RotatePoint
 
#include <gerbview.h>
#include <gerbview_frame.h>
#include <gerber_file_image.h>
#include <gerber_file_image_list.h>
#include <excellon_image.h>
#include <excellon_defaults.h>
#include <macros.h>
#include <richio.h>
#include <string_utils.h>
#include <locale_io.h>
#include <X2_gerber_attributes.h>
#include <view/view.h>
#include <gerbview_settings.h>
 
#include <cmath>
#include <charconv>
 
#include <dialogs/html_message_box.h>
 
// A helper function to calculate the arc center of an arc
// known by 2 end points, the radius, and the angle direction (CW or CCW)
// Arc angles are <= 180 degrees in circular interpol.
static VECTOR2I computeCenter( VECTOR2I aStart, VECTOR2I aEnd, int& aRadius, bool aRotCCW )
{
 VECTOR2I center;
 VECTOR2D end;
 end.x = double(aEnd.x - aStart.x);
 end.y = double(aEnd.y - aStart.y);
 
 // Be sure aRadius/2 > dist between aStart and aEnd
 double min_radius = end.EuclideanNorm() * 2;
 
 if( min_radius <= aRadius )
 {
 // Adjust the radius and the arc center for a 180 deg arc between end points
 aRadius = KiROUND( min_radius );
 center.x = ( aStart.x + aEnd.x + 1 ) / 2;
 center.y = ( aStart.y + aEnd.y + 1 ) / 2;
 return center;
 }
 
 /* to compute the centers position easily:
 * rotate the segment (0,0 to end.x,end.y) to make it horizontal (end.y = 0).
 * the X center position is end.x/2
 * the Y center positions are on the vertical line starting at end.x/2, 0
 * and solve aRadius^2 = X^2 + Y^2 (2 values)
 */
 EDA_ANGLE seg_angle( end );
 VECTOR2D h_segm = end;
 RotatePoint( h_segm, seg_angle );
 double cX = h_segm.x/2;
 double cY1 = sqrt( (double)aRadius*aRadius - cX*cX );
 double cY2 = -cY1;
 VECTOR2D center1( cX, cY1 );
 RotatePoint( center1, -seg_angle );
 EDA_ANGLE arc_angle1 = EDA_ANGLE( end - center1 ) - EDA_ANGLE( VECTOR2D( 0.0, 0.0 ) - center1 );
 VECTOR2D center2( cX, cY2 );
 RotatePoint( center2, -seg_angle );
 EDA_ANGLE arc_angle2 = EDA_ANGLE( end - center2 ) - EDA_ANGLE( VECTOR2D( 0.0, 0.0 ) - center2 );
 
 if( !aRotCCW )
 {
 if( arc_angle1 < ANGLE_0 )
 arc_angle1 += ANGLE_360;
 
 if( arc_angle2 < ANGLE_0 )
 arc_angle2 += ANGLE_360;
 }
 else
 {
 if( arc_angle1 > ANGLE_0 )
 arc_angle1 -= ANGLE_360;
 
 if( arc_angle2 > ANGLE_0 )
 arc_angle2 -= ANGLE_360;
 }
 
 // Arc angle must be <= 180.0 degrees.
 // So choose the center that create a arc angle <= 180.0
 if( std::abs( arc_angle1 ) <= ANGLE_180 )
 {
 center.x = KiROUND( center1.x );
 center.y = KiROUND( center1.y );
 }
 else
 {
 center.x = KiROUND( center2.x );
 center.y = KiROUND( center2.y );
 }
 
 return center+aStart;
}
 
extern int ReadInt( char*& text, bool aSkipSeparator = true );
extern double ReadDouble( char*& text, bool aSkipSeparator = true );
 
// See rs274d.cpp:
extern void fillFlashedGBRITEM( GERBER_DRAW_ITEM* aGbrItem,
 APERTURE_T aAperture,
 int Dcode_index,
 const VECTOR2I& aPos,
 VECTOR2I aSize,
 bool aLayerNegative );
 
extern void fillLineGBRITEM( GERBER_DRAW_ITEM* aGbrItem,
 int Dcode_index,
 const VECTOR2I& aStart,
 const VECTOR2I& aEnd,
 VECTOR2I aPenSize,
 bool aLayerNegative );
 
extern void fillArcGBRITEM( GERBER_DRAW_ITEM* aGbrItem,
 int Dcode_index,
 const VECTOR2I& aStart,
 const VECTOR2I& aEnd,
 const VECTOR2I& aRelCenter,
 VECTOR2I aPenSize,
 bool aClockwise,
 bool aMultiquadrant,
 bool aLayerNegative );
 
// Gerber X2 files have a file attribute which specify the type of image
// (copper, solder paste ... and sides tpo, bottom or inner copper layers)
// Excellon drill files do not have attributes, so, just to identify the image
// In gerbview, we add this attribute, similar to a Gerber drill file
static const char file_attribute[] = ".FileFunction,Other,Drill*";
 
static EXCELLON_CMD excellonHeaderCmdList[] =
{
 { "M0", DRILL_M_END, -1 }, // End of Program - No Rewind
 { "M00", DRILL_M_END, -1 }, // End of Program - No Rewind
 { "M15", DRILL_M_TOOL_DOWN, 0 }, // tool down (starting a routed hole)
 { "M16", DRILL_M_TOOL_UP, 0 }, // tool up (ending a routed hole)
 { "M17", DRILL_M_TOOL_UP, 0 }, // tool up similar to M16 for a viewer
 { "M30", DRILL_M_ENDFILE, -1 }, // End of File (last line of NC drill)
 { "M47", DRILL_M_MESSAGE, -1 }, // Operator Message
 { "M45", DRILL_M_LONGMESSAGE, -1 }, // Long Operator message (use more than one line)
 { "M48", DRILL_M_HEADER, 0 }, // beginning of a header
 { "M95", DRILL_M_ENDHEADER, 0 }, // End of the header
 { "METRIC", DRILL_METRIC_HEADER, 1 },
 { "INCH", DRILL_IMPERIAL_HEADER, 1 },
 { "M71", DRILL_M_METRIC, 1 },
 { "M72", DRILL_M_IMPERIAL, 1 },
 { "M25", DRILL_M_BEGINPATTERN, 0 }, // Beginning of Pattern
 { "M01", DRILL_M_ENDPATTERN, 0 }, // End of Pattern
 { "M97", DRILL_M_CANNEDTEXT, -1 },
 { "M98", DRILL_M_CANNEDTEXT, -1 },
 { "DETECT", DRILL_DETECT_BROKEN, -1 },
 { "ICI", DRILL_INCREMENTALHEADER, 1 },
 { "FMAT", DRILL_FMT, 1 }, // Use Format command
 { ";FILE_FORMAT",
 DRILL_FORMAT_ALTIUM, 1 }, // Use Format command
 { ";", DRILL_HEADER_SKIP, 0 }, // Other ; hints that we don't implement
 { "ATC", DRILL_AUTOMATIC_TOOL_CHANGE, 0 },
 { "TCST", DRILL_TOOL_CHANGE_STOP, 0 }, // Tool Change Stop
 { "AFS", DRILL_AUTOMATIC_SPEED, 0 }, // Automatic Feeds and Speeds
 { "VER", DRILL_AXIS_VERSION, 1 }, // Selection of X and Y Axis Version
 { "R", DRILL_RESET_CMD, -1 }, // Reset commands
 { "%", DRILL_REWIND_STOP, -1 }, // Rewind stop. End of the header
 { "/", DRILL_SKIP, -1 }, // Clear Tool Linking. End of the header
 // Keep this item after all commands starting by 'T':
 { "T", DRILL_TOOL_INFORMATION, 0 }, // Tool Information
 { "", DRILL_M_UNKNOWN, 0 } // last item in list
};
 
static EXCELLON_CMD excellon_G_CmdList[] =
{
 { "G90", DRILL_G_ABSOLUTE, 0 }, // Absolute Mode
 { "G91", DRILL_G_INCREMENTAL, 0 }, // Incremental Input Mode
 { "G90", DRILL_G_ZEROSET, 0 }, // Absolute Mode
 { "G00", DRILL_G_ROUT, 1 }, // Route Mode
 { "G05", DRILL_G_DRILL, 0 }, // Drill Mode
 { "G85", DRILL_G_SLOT, 0 }, // Canned Mode slot (oval holes)
 { "G01", DRILL_G_LINEARMOVE, 1 }, // Linear (Straight Line) routing Mode
 { "G02", DRILL_G_CWMOVE, 1 }, // Circular CW Mode
 { "G03", DRILL_G_CCWMOVE, 1 }, // Circular CCW Mode
 { "G93", DRILL_G_ZERO_SET, 1 }, // Zero Set (XnnYmm and coordinates origin)
 { "", DRILL_G_UNKNOWN, 0 }, // last item in list
};
 
 
bool GERBVIEW_FRAME::Read_EXCELLON_File( const wxString& aFullFileName )
{
 wxString msg;
 int layerId = GetActiveLayer(); // current layer used in GerbView
 GERBER_FILE_IMAGE_LIST* images = GetGerberLayout()->GetImagesList();
 GERBER_FILE_IMAGE* gerber_layer = images->GetGbrImage( layerId );
 
 // If the active layer contains old gerber or nc drill data, remove it
 if( gerber_layer )
 Erase_Current_DrawLayer( false );
 
 std::unique_ptr<EXCELLON_IMAGE> drill_layer_uptr = std::make_unique<EXCELLON_IMAGE>( layerId );
 
 EXCELLON_DEFAULTS nc_defaults;
 GERBVIEW_SETTINGS* cfg = static_cast<GERBVIEW_SETTINGS*>( config() );
 cfg->GetExcellonDefaults( nc_defaults );
 
 // Read the Excellon drill file:
 bool success = drill_layer_uptr->LoadFile( aFullFileName, &nc_defaults );
 
 if( !success )
 {
 drill_layer_uptr.reset();
 msg.Printf( _( "File %s not found." ), aFullFileName );
 ShowInfoBarError( msg );
 return false;
 }
 
 EXCELLON_IMAGE* drill_layer = drill_layer_uptr.release();
 
 layerId = images->AddGbrImage( drill_layer, layerId );
 
 if( layerId < 0 )
 {
 delete drill_layer;
 ShowInfoBarError( _( "No empty layers to load file into." ) );
 return false;
 }
 
 // Display errors list
 if( drill_layer->GetMessages().size() > 0 )
 {
 HTML_MESSAGE_BOX dlg( this, _( "Error reading EXCELLON drill file" ) );
 dlg.ListSet( drill_layer->GetMessages() );
 dlg.ShowModal();
 }
 
 if( GetCanvas() )
 {
 for( GERBER_DRAW_ITEM* item : drill_layer->GetItems() )
 GetCanvas()->GetView()->Add( (KIGFX::VIEW_ITEM*) item );
 }
 
 return success;
}
 
 
void EXCELLON_IMAGE::ResetDefaultValues()
{
 GERBER_FILE_IMAGE::ResetDefaultValues();
 SelectUnits( false, nullptr ); // Default unit = inch
 m_hasFormat = false; // will be true if a Altium file containing
 // the nn:mm file format is read
 
 // Files using non decimal can use No Trailing zeros or No leading Zeros
 // Unfortunately, the identifier (INCH,TZ or INCH,LZ for instance) is not
 // always set in drill files.
 // The option leading zeros looks like more frequent, so use this default
 m_NoTrailingZeros = true;
}
 
 
/*
 * Original function derived from drill_file_p() of gerbv 2.7.0.
 * Copyright of the source file drill.cpp included below:
 */
/*
 * gEDA - GNU Electronic Design Automation
 * drill.c
 * Copyright (C) 2000-2006 Andreas Andersson
 *
 * $Id$
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 */
bool EXCELLON_IMAGE::TestFileIsExcellon( const wxString& aFullFileName )
{
 char* letter;
 bool foundM48 = false;
 bool foundM30 = false;
 bool foundPercent = false;
 bool foundT = false;
 bool foundX = false;
 bool foundY = false;
 
 FILE* file = wxFopen( aFullFileName, "rb" );
 
 if( file == nullptr )
 return false;
 
 FILE_LINE_READER excellonReader( file, aFullFileName );
 
 try
 {
 while( true )
 {
 if( excellonReader.ReadLine() == nullptr )
 break;
 
 // Remove all whitespace from the beginning and end
 char* line = StrPurge( excellonReader.Line() );
 
 // Skip empty lines
 if( *line == 0 )
 continue;
 
 // Check that file is not binary (non-printing chars)
 for( size_t i = 0; i < strlen( line ); i++ )
 {
 if( !isascii( line[i] ) )
 return false;
 }
 
 // We don't want to look for any commands after a comment so
 // just end the line early if we find a comment
 char* buf = strstr( line, ";" );
 if( buf != nullptr )
 *buf = 0;
 
 // Check for M48 = start of drill header
 if( strstr( line, "M48" ) )
 foundM48 = true;
 
 // Check for M30 = end of drill program
 if( strstr( line, "M30" ) )
 if( foundPercent )
 foundM30 = true; // Found M30 after % = good
 
 // Check for % on its own line at end of header
 if( ( letter = strstr( line, "%" ) ) != nullptr )
 if( ( letter[1] == '\r' ) || ( letter[1] == '\n' ) )
 foundPercent = true;
 
 // Check for T<number>
 if( ( letter = strstr( line, "T" ) ) != nullptr )
 {
 if( !foundT && ( foundX || foundY ) )
 foundT = false; /* Found first T after X or Y */
 else
 {
 double x_val;
 
 if( wxString( letter + 1 ).ToCDouble( &x_val ) )
 foundT = true;
 }
 }
 
 // look for X<number> or Y<number>
 if( ( letter = strstr( line, "X" ) ) != nullptr )
 {
 double x_val;
 
 if( wxString( letter + 1 ).ToCDouble( &x_val ) )
 foundX = true;
 }
 
 if( ( letter = strstr( line, "Y" ) ) != nullptr )
 {
 double x_val;
 
 if( wxString( letter + 1 ).ToCDouble( &x_val ) )
 foundY = true;
 }
 }
 }
 catch( IO_ERROR& )
 {
 return false;
 }
 
 
 /* Now form logical expression determining if this is a drill file */
 if( ( ( foundX || foundY ) && foundT ) && ( foundM48 || ( foundPercent && foundM30 ) ) )
 return true;
 else if( foundM48 && foundT && foundPercent && foundM30 )
 /* Pathological case of drill file with valid header
 and EOF but no drill XY locations. */
 return true;
 
 return false;
}
 
 
/*
 * Read a EXCELLON file.
 * Gerber classes are used because there is likeness between Gerber files
 * and Excellon files
 * DCode can easily store T code (tool size) as round (or oval) shape
 * Drill commands are similar to flashed gerber items
 * Routing commands are similar to Gerber polygons
 * coordinates have the same format as Gerber, can be given in:
 * decimal format (i.i. floating notation format)
 * integer 2.4 format in imperial units,
 * integer 3.2 or 3.3 format (metric units).
 */
bool EXCELLON_IMAGE::LoadFile( const wxString & aFullFileName, EXCELLON_DEFAULTS* aDefaults )
{
 // Set the default parameter values:
 ResetDefaultValues();
 ClearMessageList();
 
 m_Current_File = wxFopen( aFullFileName, wxT( "rt" ) );
 
 if( m_Current_File == nullptr )
 return false;
 
 // Initial format setting, usualy defined in file, but not always...
 m_NoTrailingZeros = aDefaults->m_LeadingZero;
 m_GerbMetric = aDefaults->m_UnitsMM;
 
 wxString msg;
 m_FileName = aFullFileName;
 
 LOCALE_IO toggleIo;
 
 // FILE_LINE_READER will close the file.
 FILE_LINE_READER excellonReader( m_Current_File, m_FileName );
 
 while( true )
 {
 if( excellonReader.ReadLine() == nullptr )
 break;
 
 char* line = excellonReader.Line();
 char* text = StrPurge( line );
 
 if( *text == 0 ) // Skip empty lines
 continue;
 
 if( m_State == EXCELLON_IMAGE::READ_HEADER_STATE )
 {
 Execute_HEADER_And_M_Command( text );
 
 // Now units (inch/mm) are known, set the coordinate format
 SelectUnits( m_GerbMetric, aDefaults );
 }
 else
 {
 switch( *text )
 {
 case ';':
 case 'M':
 Execute_HEADER_And_M_Command( text );
 break;
 
 case 'G': // Line type Gxx : command
 Execute_EXCELLON_G_Command( text );
 break;
 
 case 'X':
 case 'Y': // command like X12550Y19250
 Execute_Drill_Command(text);
 break;
 
 case 'I':
 case 'J': /* Auxiliary Move command */
 m_IJPos = ReadIJCoord( text );
 if( *text == '*' ) // command like X35142Y15945J504
 {
 Execute_Drill_Command( text);
 }
 break;
 
 case 'T': // Select Tool command (can also create
 // the tool with an embedded definition)
 Select_Tool( text );
 break;
 
 case '%':
 break;
 
 default:
 msg.Printf( wxT( "Unexpected symbol 0x%2.2X &lt;%c&gt;" ), *text, *text );
 AddMessageToList( msg );
 break;
 } // End switch
 }
 }
 
 // Add our file attribute, to identify the drill file
 X2_ATTRIBUTE dummy;
 char* text = (char*)file_attribute;
 int dummyline = 0;
 dummy.ParseAttribCmd( nullptr, nullptr, 0, text, dummyline );
 delete m_FileFunction;
 m_FileFunction = new X2_ATTRIBUTE_FILEFUNCTION( dummy );
 
 m_InUse = true;
 
 return true;
}
 
 
bool EXCELLON_IMAGE::Execute_HEADER_And_M_Command( char*& text )
{
 EXCELLON_CMD* cmd = nullptr;
 wxString msg;
 
 // Search command in list
 for( unsigned ii = 0; ; ii++ )
 {
 EXCELLON_CMD* candidate = &excellonHeaderCmdList[ii];
 int len = candidate->m_Name.size();
 
 if( len == 0 ) // End of list reached
 break;
 
 if( candidate->m_Name.compare( 0, len, text, len ) == 0 ) // found.
 {
 cmd = candidate;
 text += len;
 break;
 }
 }
 
 if( !cmd )
 {
 msg.Printf( _( "Unknown Excellon command &lt;%s&gt;" ), text );
 AddMessageToList( msg );
 while( *text )
 text++;
 
 return false;
 }
 
 // Execute command
 // some do nothing
 switch( cmd->m_Code )
 {
 case DRILL_SKIP:
 case DRILL_M_UNKNOWN:
 break;
 
 case DRILL_M_END:
 case DRILL_M_ENDFILE:
 // if a route command is in progress, finish it
 if( m_RouteModeOn )
 FinishRouteCommand();
 
 break;
 
 case DRILL_M_MESSAGE:
 break;
 
 case DRILL_M_LONGMESSAGE:
 break;
 
 case DRILL_M_HEADER:
 m_State = READ_HEADER_STATE;
 break;
 
 case DRILL_M_ENDHEADER:
 m_State = READ_PROGRAM_STATE;
 break;
 
 case DRILL_REWIND_STOP: // End of header. No action in a viewer
 m_State = READ_PROGRAM_STATE;
 break;
 
 case DRILL_FORMAT_ALTIUM:
 readFileFormat( text );
 break;
 
 case DRILL_HEADER_SKIP:
 break;
 
 case DRILL_M_METRIC:
 SelectUnits( true, nullptr );
 break;
 
 case DRILL_IMPERIAL_HEADER: // command like INCH,TZ or INCH,LZ
 case DRILL_METRIC_HEADER: // command like METRIC,TZ or METRIC,LZ
 SelectUnits( cmd->m_Code == DRILL_METRIC_HEADER ? true : false, nullptr );
 
 if( *text != ',' )
 {
 // No TZ or LZ specified. Should be a decimal format
 // but this is not always the case. Use our default setting
 break;
 }
 
 text++; // skip separator
 if( *text == 'T' )
 m_NoTrailingZeros = false;
 else
 m_NoTrailingZeros = true;
 break;
 
 case DRILL_M_BEGINPATTERN:
 break;
 
 case DRILL_M_ENDPATTERN:
 break;
 
 case DRILL_M_CANNEDTEXT:
 break;
 
 case DRILL_M_TIPCHECK:
 break;
 
 case DRILL_DETECT_BROKEN:
 break;
 
 case DRILL_INCREMENTALHEADER:
 if( *text != ',' )
 {
 AddMessageToList( wxT( "ICI command has no parameter" ) );
 break;
 }
 text++; // skip separator
 // Parameter should be ON or OFF
 if( strncasecmp( text, "OFF", 3 ) == 0 )
 m_Relative = false;
 else if( strncasecmp( text, "ON", 2 ) == 0 )
 m_Relative = true;
 else
 AddMessageToList( wxT( "ICI command has incorrect parameter" ) );
 break;
 
 case DRILL_TOOL_CHANGE_STOP:
 break;
 
 case DRILL_AUTOMATIC_SPEED:
 break;
 
 case DRILL_AXIS_VERSION:
 break;
 
 case DRILL_RESET_CMD:
 break;
 
 case DRILL_AUTOMATIC_TOOL_CHANGE:
 break;
 
 case DRILL_FMT:
 break;
 
 case DRILL_TOOL_INFORMATION:
 readToolInformation( text );
 break;
 
 case DRILL_M_TOOL_DOWN: // tool down (starting a routed hole or polyline)
 // Only the last position is useful:
 if( m_RoutePositions.size() > 1 )
 m_RoutePositions.erase( m_RoutePositions.begin(), m_RoutePositions.begin() + m_RoutePositions.size() - 1 );
 
 break;
 
 case DRILL_M_TOOL_UP: // tool up (ending a routed polyline)
 FinishRouteCommand();
 break;
 }
 
 while( *text )
 text++;
 
 return true;
}
 
 
void EXCELLON_IMAGE::readFileFormat( char*& aText )
{
 int mantissaDigits = 0;
 int characteristicDigits = 0;
 
 // Example String: ;FILE_FORMAT=4:4
 // The ;FILE_FORMAT potion will already be stripped off.
 // Parse the rest strictly as single_digit:single_digit like 4:4 or 2:4
 // Don't allow anything clever like spaces or multiple digits
 if( *aText != '=' )
 return;
 
 aText++;
 
 if( !isdigit( *aText ) )
 return;
 
 characteristicDigits = *aText - '0';
 aText++;
 
 if( *aText != ':' )
 return;
 
 aText++;
 
 if( !isdigit( *aText ) )
 return;
 
 mantissaDigits = *aText - '0';
 
 m_hasFormat = true;
 m_FmtLen.x = m_FmtLen.y = characteristicDigits + mantissaDigits;
 m_FmtScale.x = m_FmtScale.y = mantissaDigits;
}
 
 
bool EXCELLON_IMAGE::readToolInformation( char*& aText )
{
 // Read a tool definition like T1C0.02 or T1F00S00C0.02 or T1C0.02F00S00
 // and enter the TCODE param in list (using the D_CODE param management, which
 // is similar to TCODE params.
 if( *aText == 'T' ) // This is the beginning of the definition
 aText++;
 
 // Read tool number:
 int iprm = ReadInt( aText, false );
 
 // Skip Feed rate and Spindle speed, if any here
 while( *aText && ( *aText == 'F' || *aText == 'S' ) )
 {
 aText++;
 ReadInt( aText, false );
 }
 
 // Read tool shape
 if( ! *aText )
 AddMessageToList( wxString:: Format(
 _( "Tool definition shape not found" ) ) );
 else if( *aText != 'C' )
 AddMessageToList( wxString:: Format(
 _( "Tool definition '%c' not supported" ), *aText ) );
 if( *aText )
 aText++;
 
 //read tool diameter:
 double dprm = ReadDouble( aText, false );
 m_Has_DCode = true;
 
 // Initialize Dcode to handle this Tool
 // Remember: dcodes are >= FIRST_DCODE
 D_CODE* dcode = GetDCODEOrCreate( iprm + FIRST_DCODE );
 
 if( dcode == nullptr )
 return false;
 
 // conv_scale = scaling factor from inch to Internal Unit
 double conv_scale = gerbIUScale.IU_PER_MILS * 1000;
 
 if( m_GerbMetric )
 conv_scale /= 25.4;
 
 dcode->m_Size.x = dcode->m_Size.y = KiROUND( dprm * conv_scale );
 dcode->m_ApertType = APT_CIRCLE;
 dcode->m_Defined = true;
 
 return true;
}
 
 
bool EXCELLON_IMAGE::Execute_Drill_Command( char*& text )
{
 D_CODE* tool;
 GERBER_DRAW_ITEM * gbritem;
 
 while( true )
 {
 switch( *text )
 {
 case 'X':
 case 'Y':
 ReadXYCoord( text, true );
 
 if( *text == 'I' || *text == 'J' )
 ReadIJCoord( text );
 
 break;
 
 case 'G': // G85 is found here for oval holes
 m_PreviousPos = m_CurrentPos;
 Execute_EXCELLON_G_Command( text );
 break;
 
 case 0: // E.O.L: execute command
 if( m_RouteModeOn )
 {
 // We are in routing mode, and this is an intermediate point.
 // So just store it
 int rmode = 0; // linear routing.
 
 if( m_Iterpolation == GERB_INTERPOL_ARC_NEG )
 rmode = ROUTE_CW;
 else if( m_Iterpolation == GERB_INTERPOL_ARC_POS )
 rmode = ROUTE_CCW;
 
 if( m_LastArcDataType == ARC_INFO_TYPE_CENTER )
 {
 EXCELLON_ROUTE_COORD point( m_CurrentPos, m_IJPos, rmode );
 m_RoutePositions.push_back( point );
 }
 else
 {
 EXCELLON_ROUTE_COORD point( m_CurrentPos, m_ArcRadius, rmode );
 m_RoutePositions.push_back( point );
 }
 return true;
 }
 
 tool = GetDCODE( m_Current_Tool );
 if( !tool )
 {
 wxString msg;
 msg.Printf( _( "Tool %d not defined" ), m_Current_Tool );
 AddMessageToList( msg );
 return false;
 }
 
 gbritem = new GERBER_DRAW_ITEM( this );
 AddItemToList( gbritem );
 
 if( m_SlotOn ) // Oblong hole
 {
 fillLineGBRITEM( gbritem, tool->m_Num_Dcode,
 m_PreviousPos, m_CurrentPos,
 tool->m_Size, false );
 // the hole is made: reset the slot on command (G85)
 // (it is needed for each oblong hole)
 m_SlotOn = false;
 }
 else
 {
 fillFlashedGBRITEM( gbritem, tool->m_ApertType, tool->m_Num_Dcode,
 m_CurrentPos, tool->m_Size, false );
 }
 
 StepAndRepeatItem( *gbritem );
 m_PreviousPos = m_CurrentPos;
 return true;
 break;
 
 default:
 text++;
 break;
 }
 }
 
 return true;
}
 
 
bool EXCELLON_IMAGE::Select_Tool( char*& text )
{
 // Select the tool from the command line Tn, with n = 1 ... TOOLS_MAX_COUNT - 1
 // Because some drill file have an embedded TCODE definition (like T1C.008F0S0)
 // in tool selection command, if the tool is not defined in list,
 // and the definition is embedded, it will be entered in list
 char * startline = text; // the tool id starts here.
 int tool_id = CodeNumber( text );
 
 // T0 is legal, but is not a selection tool. it is a special command
 if( tool_id >= 0 )
 {
 int dcode_id = tool_id + FIRST_DCODE; // Remember: dcodes are >= FIRST_DCODE
 
 if( dcode_id > (TOOLS_MAX_COUNT - 1) )
 dcode_id = TOOLS_MAX_COUNT - 1;
 
 m_Current_Tool = dcode_id;
 D_CODE* currDcode = GetDCODE( dcode_id );
 
 // if the tool does not exist, and the definition is embedded, create this tool
 if( currDcode == nullptr && tool_id > 0 )
 {
 text = startline; // text starts at the beginning of the command
 readToolInformation( text );
 currDcode = GetDCODE( dcode_id );
 }
 
 // If the Tool is still not existing, create a dummy tool
 if( !currDcode )
 currDcode = GetDCODEOrCreate( dcode_id, true );
 
 if( currDcode )
 currDcode->m_InUse = true;
 }
 
 while( *text )
 text++;
 
 return tool_id >= 0;
}
 
 
bool EXCELLON_IMAGE::Execute_EXCELLON_G_Command( char*& text )
{
 EXCELLON_CMD* cmd = nullptr;
 bool success = false;
 int id = DRILL_G_UNKNOWN;
 
 // Search command in list
 EXCELLON_CMD* candidate;
 char * gcmd = text; // gcmd points the G command, for error messages.
 
 for( unsigned ii = 0; ; ii++ )
 {
 candidate = &excellon_G_CmdList[ii];
 int len = candidate->m_Name.size();
 if( len == 0 ) // End of list reached
 break;
 if( candidate->m_Name.compare( 0, len, text, len ) == 0 ) // found.
 {
 cmd = candidate;
 text += len;
 success = true;
 id = cmd->m_Code;
 break;
 }
 }
 
 switch( id )
 {
 case DRILL_G_ZERO_SET:
 ReadXYCoord( text, true );
 m_Offset = m_CurrentPos;
 break;
 
 case DRILL_G_ROUT:
 m_SlotOn = false;
 
 if( m_RouteModeOn )
 FinishRouteCommand();
 
 m_RouteModeOn = true;
 m_RoutePositions.clear();
 m_LastArcDataType = ARC_INFO_TYPE_NONE;
 ReadXYCoord( text, true );
 // This is the first point (starting point) of routing
 m_RoutePositions.emplace_back( m_CurrentPos );
 break;
 
 case DRILL_G_DRILL:
 m_SlotOn = false;
 
 if( m_RouteModeOn )
 FinishRouteCommand();
 
 m_RouteModeOn = false;
 m_RoutePositions.clear();
 m_LastArcDataType = ARC_INFO_TYPE_NONE;
 break;
 
 case DRILL_G_SLOT:
 m_SlotOn = true;
 break;
 
 case DRILL_G_LINEARMOVE:
 m_LastArcDataType = ARC_INFO_TYPE_NONE;
 m_Iterpolation = GERB_INTERPOL_LINEAR_1X;
 ReadXYCoord( text, true );
 m_RoutePositions.emplace_back( m_CurrentPos );
 break;
 
 case DRILL_G_CWMOVE:
 m_Iterpolation = GERB_INTERPOL_ARC_NEG;
 ReadXYCoord( text, true );
 
 if( *text == 'I' || *text == 'J' )
 ReadIJCoord( text );
 
 if( m_LastArcDataType == ARC_INFO_TYPE_CENTER )
 m_RoutePositions.emplace_back( m_CurrentPos, m_IJPos, ROUTE_CW );
 else
 m_RoutePositions.emplace_back( m_CurrentPos, m_ArcRadius, ROUTE_CW );
 break;
 
 case DRILL_G_CCWMOVE:
 m_Iterpolation = GERB_INTERPOL_ARC_POS;
 ReadXYCoord( text, true );
 
 if( *text == 'I' || *text == 'J' )
 ReadIJCoord( text );
 
 if( m_LastArcDataType == ARC_INFO_TYPE_CENTER )
 m_RoutePositions.emplace_back( m_CurrentPos, m_IJPos, ROUTE_CCW );
 else
 m_RoutePositions.emplace_back( m_CurrentPos, m_ArcRadius, ROUTE_CCW );
 break;
 
 case DRILL_G_ABSOLUTE:
 m_Relative = false; // false = absolute coord
 break;
 
 case DRILL_G_INCREMENTAL:
 m_Relative = true; // true = relative coord
 break;
 
 case DRILL_G_UNKNOWN:
 default:
 AddMessageToList( wxString::Format( _( "Unknown Excellon G Code: &lt;%s&gt;" ), From_UTF8(gcmd) ) );
 while( *text )
 text++;
 return false;
 }
 
 return success;
}
 
void EXCELLON_IMAGE::SelectUnits( bool aMetric, EXCELLON_DEFAULTS* aDefaults )
{
 /* Coordinates are measured either in inch or metric (millimeters).
 * Inch coordinates are in six digits (00.0000) with increments
 * as small as 0.0001 (1/10,000).
 * Metric coordinates can be measured in microns (thousandths of a millimeter)
 * in one of the following three ways:
 * Five digit 10 micron resolution (000.00)
 * Six digit 10 micron resolution (0000.00)
 * Six digit micron resolution (000.000)
 *
 * Inches: Default fmt = 2.4 for X and Y axis: 6 digits with 0.0001 resolution
 * metric: Default fmt = 3.3 for X and Y axis: 6 digits, 1 micron resolution
 *
 * However some drill files do not use standard values.
 */
 if( aMetric )
 {
 m_GerbMetric = true;
 
 if( !m_hasFormat )
 {
 if( aDefaults )
 {
 // number of digits in mantissa
 m_FmtScale.x = m_FmtScale.y = aDefaults->m_MmMantissaLen;
 // number of digits (mantissa+integer)
 m_FmtLen.x = m_FmtLen.y = aDefaults->m_MmIntegerLen
 + aDefaults->m_MmMantissaLen;
 }
 else
 {
 m_FmtScale.x = m_FmtScale.y = FMT_MANTISSA_MM;
 m_FmtLen.x = m_FmtLen.y = FMT_INTEGER_MM + FMT_MANTISSA_MM;
 }
 }
 }
 else
 {
 m_GerbMetric = false;
 
 if( !m_hasFormat )
 {
 if( aDefaults )
 {
 m_FmtScale.x = m_FmtScale.y = aDefaults->m_InchMantissaLen;
 m_FmtLen.x = m_FmtLen.y = aDefaults->m_InchIntegerLen
 + aDefaults->m_InchMantissaLen;
 }
 else
 {
 m_FmtScale.x = m_FmtScale.y = FMT_MANTISSA_INCH;
 m_FmtLen.x = m_FmtLen.y = FMT_INTEGER_INCH + FMT_MANTISSA_INCH;
 }
 }
 }
}
 
 
void EXCELLON_IMAGE::FinishRouteCommand()
{
 // Ends a route command started by M15 ot G01, G02 or G03 command
 // if a route command is not in progress, do nothing
 
 if( !m_RouteModeOn )
 return;
 
 D_CODE* tool = GetDCODE( m_Current_Tool );
 
 if( !tool )
 {
 AddMessageToList( wxString::Format( wxT( "Unknown tool code %d" ), m_Current_Tool ) );
 return;
 }
 
 for( size_t ii = 1; ii < m_RoutePositions.size(); ii++ )
 {
 GERBER_DRAW_ITEM* gbritem = new GERBER_DRAW_ITEM( this );
 
 if( m_RoutePositions[ii].m_rmode == 0 ) // linear routing
 {
 fillLineGBRITEM( gbritem, tool->m_Num_Dcode,
 m_RoutePositions[ii-1].GetPos(), m_RoutePositions[ii].GetPos(),
 tool->m_Size, false );
 }
 else // circular (cw or ccw) routing
 {
 bool rot_ccw = m_RoutePositions[ii].m_rmode == ROUTE_CW;
 int radius = m_RoutePositions[ii].m_radius; // Can be adjusted by computeCenter.
 VECTOR2I center;
 
 if( m_RoutePositions[ii].m_arc_type_info == ARC_INFO_TYPE_CENTER )
 center = VECTOR2I( m_RoutePositions[ii].m_cx, m_RoutePositions[ii].m_cy );
 else
 center = computeCenter( m_RoutePositions[ii-1].GetPos(),
 m_RoutePositions[ii].GetPos(), radius, rot_ccw );
 
 fillArcGBRITEM( gbritem, tool->m_Num_Dcode,
 m_RoutePositions[ii-1].GetPos(), m_RoutePositions[ii].GetPos(),
 center - m_RoutePositions[ii-1].GetPos(),
 tool->m_Size, not rot_ccw , true,
 false );
 }
 
 AddItemToList( gbritem );
 
 StepAndRepeatItem( *gbritem );
 }
 
 m_RoutePositions.clear();
 m_RouteModeOn = false;
}