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   Copyright (c) 2003, International Barcode Consortium
   All rights reserved.
   
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   are permitted provided that the following conditions are met:
   
       * Redistributions of source code must retain the above copyright notice, this list of
         conditions and the following disclaimer.
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        provided with the distribution.
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  package net.sourceforge.barbecue.twod.pdf417;
  
  import net.sourceforge.barbecue.Module;
  import net.sourceforge.barbecue.output.Output;
  import net.sourceforge.barbecue.output.OutputException;
  
  /**
   * Specific module implementation that draws an entire PDF417 barcode
   * as one barbecue module. This is not an ideal implementation, but was
   * the best way of integrating the PDF417 code short of re-writing it.
   *
   * <p/>Contributed by Alex Ferrer <alex@ftconsult.com>
   *
   * @author Alex Ferrer
   * @author <a href="mailto:opensource@ianbourke.com">Ian Bourke</a>
   *
   * @todo Do we really want to fix the DATACOLS to 12?
   */
  public class PDF417Module extends Module {
  	private static final int DATACOLS = 12;
  
  	private final String data;
  	private int[] out;
  	private int outlen;
  	private int outrows;
  	private int col = 0;
  	private int xp;
  	private int yp;
  	private int startX;
  	private int wsize = 0;
  	private int barWidth;
  
  	/**
  	 * Constructs the PDF417 barcode with the specified data.
  	 * @param data The data to encode
  	 */
  	public PDF417Module(String data) {
  		super(new int[0]);
  		this.data = data;
  	}
  
  	/**
  	 * Returns the barcode width;
  	 * @return The barcode width
  	 */
  	private int getBarcodeWidth() {
  		return wsize - startX;
  	}
  
  	/**
  	 * Returns the barcode height.
  	 * @return The barcode height
  	 */
  	int getBarcodeHeight() {
  		return yp;
  	}
  
  	/**
  	 * Draw the barcode to the specified outputter, at the specified origin.
  	 * @param outputter The outputter
  	 * @param x The X component of the origin
  	 * @param y The Y component of the origin
  	 * @param barWidth
  	 * @param barHeight
  	 * @return The total width drawn
  	 */
  	protected int draw(Output outputter, int x, int y, int barWidth, int barHeight) throws OutputException {
  		this.xp = (int) x;
  		this.startX = (int) x;
  		this.yp = (int) y;
  		this.barWidth = (int) barWidth;
  		createCodewords(data.toCharArray(), data.length());
  		createBits(out, outlen, outrows);
 		encode(out, outrows, outputter);
 
 		return getBarcodeWidth();
 	}
 
 	/**
 	 * I have no idea what this does.
 	 * @param data The barcode data
 	 * @param length The length of the data
 	 * @param ecLength The length of the EC (2)
 	 */
 	private void generateEC(int[] data, int length, int ecLength) {
 		int b0 = 0;
 		int b1 = 0;
 		int g0 = 27;
 		int g1 = 917;  /* (x-3)(x-9) = x^2+917x+27 mod 929 */
 
 		/* Initialize */
 		data[length] = 0;
 		data[length + 1] = 0;
 
 		/* We only know ecLength == 2 for now */
 		if (ecLength != 2) {
 			return;
 		}
 
 		/* Load up with data */
 		for (int i = 0; i < length; ++i) {
 			int wrap = (b1 + data[i]) % 929;
 
 			if (wrap != 0) {
 				wrap = 929 - wrap;
 			}
 
 			b1 = (b0 + g1 * wrap) % 929;
 			b0 = (0 + g0 * wrap) % 929;
 		}
 
 		/* Read off the info */
 		if (b0 != 0) {
 			b0 = 929 - b0;
 		}
 
 		if (b1 != 0) {
 			b1 = 929 - b1;
 		}
 
 		data[length] = b1;
 		data[length + 1] = b0;
 	}
 
 	private void outbit(int bit, Output params) throws OutputException {
 		params.drawBar(xp, yp, 1, 1, bit == 1);
 
 		xp = xp + barWidth;
 		if (col++ == wsize - 1) {
 			col = 0;
 			yp = yp + 1;
 			xp = startX;
 		}
 	}
 
 	private void createCodewords(char[] data, int len) {
 		int ecLength = 2; /* Number of codewords for error correction */
 		/* Check args */
 
 		if (DATACOLS < 1 || DATACOLS > 30) {
 			return;
 		}
 		/* Calculate the length of the eventual sequence */
 		outlen = 2 + (len / 6) * 5 + (len % 6) + ecLength;
 
 		/* Pad to an integer number of rows, at least 3 */
 		outrows = outlen / DATACOLS;
 		if ((outlen % DATACOLS) != 0) {
 			++outrows;
 		}
 		if (outrows < 3) {
 			outrows = 3;
 		}
 		if (outrows > 90) {
 			return;
 		}
 		outlen = outrows * DATACOLS;
 		/* We don't do multipart symbols (Macro PDF 417) */
 		if (outlen > 928) {
 			return;
 		}
 
 		/* The first two codewords are the length and the BC mode latch
 		   The mode latch is 924 if len is a multiple of 6, 901 otherwise */
 		out = new int[outlen];              // dimension the array
 		out[0] = 2 + (len / 6) * 5 + (len % 6);   // 1st value s size of sequence
 		if (len % 6 != 0) {
 			out[1] = 901;  					// if len not a multiple of 6
 		} else {
 			out[1] = 924;                    // if len *is* a multiple of 6
 		}
 
 		/* Map blocks of 6 bytes to block of 5 codewords */
 		int inp = 0;
 		int outp = 2;
 		while (inp + 5 < len) {
 			/* Treat the 6 bytes as a big-endian base 256 number */
 			long codeval = 0;
 			for (int i = 0; i < 6; ++i) {
 				codeval <<= 8;
 				codeval += data[inp++];
 			}
 			/* Convert the number to base 900 */
 			for (int i = 0; i < 5; i++) {
 				out[outp + 4 - i] = new Long(codeval % 900).intValue();
 				codeval /= 900;
 			}
 			outp += 5;
 		}
 
 		/* Finish up the data */
 		while (inp < len) {
 			out[outp++] = data[inp++];
 		}
 
 		/* Do padding */
 		while (outp < outlen - ecLength) {
 			out[outp++] = 900;
 		}
 
 		generateEC(out, outp, ecLength);
 	}
 
 	private void createBits(int[] codes, int codelen, int datarows) {
 		int row, inp, outp;
 		if (DATACOLS < 1 || DATACOLS > 30
 		 				 || datarows < 3 || datarows > 90
 		 				 || codelen != DATACOLS * datarows) {
 			return;
 		}
 		/* Each row has start, left, data, right, stop */
 		int outlen = datarows * (DATACOLS + 4);
 		int[] out = new int[outlen];
 		outp = 0;
 		inp = 0;
 
 		for (row = 0; row < datarows; ++row) {
 			/* Do each row */
 			int v = DATACOLS - 1;
 			int w = row % 3;
 			int x = row / 3;
 			int y = datarows / 3;
 			int z = 0 * 3 + datarows % 3;  /* The 0 is the error correction level */
 			out[outp++] = PDF417Data.PDF417_START;
 			switch (w) {
 				case 0:
 					out[outp++] = PDF417Data.PDF417_BITS[w][30 * x + y];
 					break;
 				case 1:
 					out[outp++] = PDF417Data.PDF417_BITS[w][30 * x + z];
 					break;
 				case 2:
 					out[outp++] = PDF417Data.PDF417_BITS[w][30 * x + v];
 					break;
 			}
 			for (int i = 0; i < DATACOLS; ++i) {
 				out[outp++] = PDF417Data.PDF417_BITS[w][codes[inp++]];
 			}
 			switch (w) {
 				case 0:
 					out[outp++] = PDF417Data.PDF417_BITS[w][30 * x + v];
 					break;
 				case 1:
 					out[outp++] = PDF417Data.PDF417_BITS[w][30 * x + y];
 					break;
 				case 2:
 					out[outp++] = PDF417Data.PDF417_BITS[w][30 * x + z];
 					break;
 			}
 			out[outp++] = PDF417Data.PDF417_STOP;
 		}
 		this.out = out;
 		this.outlen = outlen;
 	}
 
 	private void encode(int[] data, int datarows, Output params) throws OutputException {
 		int bitpattern;
 		int row_height = 7;
 		int npix = 2;
 		wsize = ((DATACOLS + 4) * 17 + barWidth + 4) * npix;
 
 		/* Top quiet zone */
 		for (int i = 0; i < 2 * npix; i++) {
 			for (int j = 0; j < ((DATACOLS + 4) * 17 + 1 + 4) * npix; j++) {
 				outbit(0, params);
 			}
 		}
 
 		for (int i = 0; i < datarows; i++) {
 			for (int k = 0; k < row_height; k++) {
 
 				/* Left quiet zone */
 				for (int pixn = 0; pixn < 2 * npix; pixn++) {
 					outbit(0, params);
 				}
 
 				for (int j = 0; j < (DATACOLS + 4); j++) {
 					bitpattern = data[(DATACOLS + 4) * i + j];
 
 					for (int bitm = 16; bitm >= 0; bitm--) {
 						for (int pixn = 0; pixn < npix; pixn++) {
 
 							if ((bitpattern & (1 << bitm)) != 0) {
 								outbit(1, params);
 							} else {
 								outbit(0, params);
 							}
 						}
 					}
 				}
 
 				for (int pixn = 0; pixn < npix; pixn++) {
 					outbit(1, params);
 				}
 
 				/* Right quiet zone */
 				for (int pixn = 0; pixn < 2 * npix; pixn++) {
 					outbit(0, params);
 				}
 			}
 		}
 
 		/* Bottom quiet zone */
 		for (int i = 0; i < 2 * npix; ++i) {
 			for (int j = 0; j < ((DATACOLS + 4) * 17 + 1 + 4) * npix; ++j) {
 				outbit(0, params);
 			}
 		}
 	}
 }