Example usage for com.lowagie.text.pdf PdfReader LZWDecode

Introduction

In this page you can find the example usage for com.lowagie.text.pdf PdfReader LZWDecode.

Prototype

public static byte[] LZWDecode(byte in[]) 

Source Link

Document

Decodes a stream that has the LZWDecode filter.

Usage

From source file:org.opensha.commons.mapping.gmt.raster.RasterExtractor.java

License:Apache License

public BufferedImage getRasterImage() throws FileNotFoundException, IOException {

    ArrayList<String> lines = FileUtils.loadFile(psFileName);

    boolean reading = false;
    boolean colorimage = false;

    boolean ascii85 = false;
    boolean lzwDecode = false;

    int width = 0;
    int height = 0;
    int pixels = 0;
    int expected = 0;
    byte[] bytes = null;
    int byteCount = 0;

    int curLine = 0;

    StringBuilder asciiImage = null;

    for (String line : lines) {
        if (!reading) {
            if (line.contains("false 3 colorimage")) {
                reading = true;/*w  ww.  ja  v a  2s . c  o  m*/
                StringTokenizer tok = new StringTokenizer(line);

                width = Integer.parseInt(tok.nextToken());
                height = Integer.parseInt(tok.nextToken());
                int depth = Integer.parseInt(tok.nextToken());
                if (depth != 8) {
                    System.out.println("BAD DEPTH! EXITING!");
                    return null;
                }
                pixels = width * height;
                expected = pixels * 3; // pixels * 1 byte for R, G, and B
                bytes = new byte[expected];

                System.out.println(
                        "time to READ: false 3 colorimage " + width + "x" + height + " " + pixels + " px");
                colorimage = true;
                continue;
            } else if (line.contains("ASCII85Decode")) {

                lzwDecode = line.contains("LZWDecode");

                int depth = 0;

                for (int i = curLine - 2; i < curLine + 3; i++) {
                    String parseLine = lines.get(i);
                    StringTokenizer parseTok = new StringTokenizer(parseLine);
                    while (parseTok.hasMoreTokens()) {
                        String token = parseTok.nextToken();
                        if (token.contains("/Width"))
                            width = Integer.parseInt(parseTok.nextToken());
                        else if (token.contains("/Height"))
                            height = Integer.parseInt(parseTok.nextToken());
                        else if (token.contains("/BitsPerComponent"))
                            depth = Integer.parseInt(parseTok.nextToken());
                    }
                    if (width > 0 && height > 0 && depth > 0)
                        break;
                }

                System.out.println(width + " " + height + " " + depth);

                if (width <= 0 || height <= 0 || depth != 8)
                    return null;

                pixels = width * height;
                expected = pixels * 3; // pixels * 1 byte for R, G, and B
                bytes = new byte[expected];

                System.out
                        .println("time to READ! ASCII85Decode " + width + "x" + height + " " + pixels + " px");

                reading = true;
                ascii85 = true;
                asciiImage = new StringBuilder();
                continue;
            }
        }
        if (reading && bytes != null) { //we're in the middle of the string
            if (ascii85) {
                if (line.startsWith(">> image"))
                    continue;

                //               asciiImage += line + "\n";
                asciiImage.append(line + "\n");

                if (line.contains("~>")) {
                    //                  System.out.println(line);
                    break;
                }
            } else if (colorimage) {
                if (line.startsWith("U"))
                    break;
                for (int i = 0; i < line.length(); i += 2) {
                    bytes[byteCount] = (byte) Integer.parseInt(line.substring(i, i + 2), 16);

                    byteCount++;
                }
            }
        }

        curLine++;
    }

    System.out.println("Done reading...converting.");

    if (ascii85) {
        InputStream is = new ByteArrayInputStream(asciiImage.toString().getBytes("UTF-8"));
        ASCII85InputStream ais = new ASCII85InputStream(is);

        //         System.out.println(asciiImage);

        while (!ais.isEndReached()) {
            if (byteCount < expected) {
                int data = ais.read();
                bytes[byteCount] = (byte) data;
                byteCount++;
            } else
                break;
        }
        if (lzwDecode) {
            bytes = PdfReader.LZWDecode(bytes);
        }
        ais.close();
    }

    System.out.println("Read in " + byteCount + " bytes...expected: " + expected);

    return this.getBufferedImage(bytes, width, height);
}

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