Example usage for org.apache.pdfbox.cos COSStream getFilters

Introduction

In this page you can find the example usage for org.apache.pdfbox.cos COSStream getFilters.

Prototype

public COSBase getFilters() 

Source Link

Document

This will return the filters to apply to the byte stream.

Usage

From source file:se.streamsource.streamflow.web.application.pdf.Underlay.java

License:Apache License

private COSStream makeUniqObjectNames(Map objectNameMap, COSStream stream) throws IOException {
    ByteArrayOutputStream baos = new ByteArrayOutputStream(10240);

    byte[] buf = new byte[10240];
    int read;/*from   www .  ja v a 2s.c om*/
    InputStream is = stream.getUnfilteredStream();
    while ((read = is.read(buf)) > -1) {
        baos.write(buf, 0, read);
    }

    buf = baos.toByteArray();
    baos = new ByteArrayOutputStream(buf.length + 100);
    StringBuffer sbObjectName = new StringBuffer(10);
    boolean bInObjectIdent = false;
    boolean bInText = false;
    boolean bInEscape = false;
    for (int i = 0; i < buf.length; i++) {
        byte b = buf[i];

        if (!bInEscape) {
            if (!bInText && b == '(') {
                bInText = true;
            }
            if (bInText && b == ')') {
                bInText = false;
            }
            if (b == '\\') {
                bInEscape = true;
            }

            if (!bInText && !bInEscape) {
                if (b == '/') {
                    bInObjectIdent = true;
                } else if (bInObjectIdent && Character.isWhitespace((char) b)) {
                    bInObjectIdent = false;

                    String objectName = sbObjectName.toString().substring(1);
                    String newObjectName = objectName + "overlay";
                    baos.write('/');
                    baos.write(newObjectName.getBytes());

                    objectNameMap.put(objectName, COSName.getPDFName(newObjectName));

                    sbObjectName.delete(0, sbObjectName.length());
                }
            }

            if (bInObjectIdent) {
                sbObjectName.append((char) b);
                continue;
            }
        } else {
            bInEscape = false;
        }

        baos.write(b);
    }

    COSDictionary streamDict = new COSDictionary();
    streamDict.setInt(COSName.LENGTH, baos.size());
    COSStream output = new COSStream(streamDict, pdfDocument.getDocument().getScratchFile());
    output.setFilters(stream.getFilters());
    OutputStream os = output.createUnfilteredStream();
    baos.writeTo(os);
    os.close();

    return output;
}

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