[jira] [Issue Comment Edited] (TIKA-679) Proposal for PRT Parser

["Troy Witthoeft (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/TIKA-679?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13059639#comment-13059639 ] 

Troy Witthoeft edited comment on TIKA-679 at 7/4/11 11:49 PM:
--------------------------------------------------------------

I've narrowed the encoding down to CP437.
CP437 correctly identifies many of the engineering symbols, such as [±] "plus minus," [º] degree," but fails on "diameter"
PRT files actually store the diameter symbol as three characters, with the second one always being [φ] "lowercase phi"
While not identical, the Nordic [Ø] "O with slash" is often accepted as the diameter symbol. 

You may find a more elegant solution looking at [http://en.wikipedia.org/wiki/Code_page_437]
I've simply been substituting.


String str = new String(text, 0, text.length, "Cp437");
str = str.replace("\u03C6","\u00D8");


      was (Author: runamok81):
    I've narrowed the encoding down to CP437.
CP437 correctly identifies many of the engineering symbols, such as [±] "plus minus," [º] degree," but fails on "diameter"
PRT files actually store the diameter symbol as three characters, with the second one always being [φ] "lowercase phi"
While not identical, the Nordic [Ø] "O with slash" is often accepted as the diameter symbol. 

You may find a more elegant solution looking at [http://en.wikipedia.org/wiki/Code_page_437]
I've simply been substituting.

[code]
String str = new String(text, 0, text.length, "Cp437");
str = str.replace("\u03C6","\u00D8");
[/code]
  
> Proposal for PRT Parser
> -----------------------
>
>                 Key: TIKA-679
>                 URL: https://issues.apache.org/jira/browse/TIKA-679
>             Project: Tika
>          Issue Type: Improvement
>          Components: mime, parser
>            Reporter: Troy Witthoeft
>            Priority: Minor
>              Labels: CAD, Mime, Parser, Prt, Tika
>         Attachments: TikaTest.prt
>
>   Original Estimate: 672h
>  Remaining Estimate: 672h
>
> It would be nice if Tika had support for prt CAD files.
> A preliminary prt text extractor has been created.
> Any assistance further developing this code is appreciated.
> {code:title=PRTParser.java|borderStyle=solid}
> package org.apache.tika.parser.prt;
> import java.io.BufferedInputStream;
> import java.io.BufferedReader;
> import java.io.IOException;
> import java.io.InputStream;
> import java.io.InputStreamReader;
> import java.io.Reader;
> import java.io.UnsupportedEncodingException;
> import java.nio.charset.Charset;
> import java.util.Collections;
> import java.util.Set;
> import org.apache.poi.util.IOUtils;
> import org.apache.tika.exception.TikaException;
> import org.apache.tika.metadata.Metadata;
> import org.apache.tika.mime.MediaType;
> import org.apache.tika.parser.ParseContext;
> import org.apache.tika.parser.Parser;
> import org.apache.tika.sax.XHTMLContentHandler;
> import org.xml.sax.ContentHandler;
> import org.xml.sax.SAXException;
> /**
>  * Description: PRT (CAD Drawing) parser. This is a very basic parser.   
>  * Searches for specific byte prefix, and outputs text from note entities
>  * Does not support special DRAFT-PAK characters.
>  */
> public class PRTParser implements Parser {
>     private static final Set<MediaType> SUPPORTED_TYPES = Collections.singleton(MediaType.application("prt"));
>     public static final String PRT_MIME_TYPE = "application/prt";
>         	
>     public Set<MediaType> getSupportedTypes(ParseContext context) {
>         return SUPPORTED_TYPES;
>         }
> 		
>     public void parse(
> 		InputStream stream, ContentHandler handler,
> 		Metadata metadata, ParseContext context)
> 		throws IOException, SAXException, TikaException {
> 		XHTMLContentHandler xhtml = new XHTMLContentHandler(handler, metadata);
> 		int[] prefix = new int[] {227, 63};  				//Looking for a prefix set of bytes {E3, 3F} 
> 		int pos = 0;											
> 		int read;
> 		while( (read = stream.read()) > -1) {					// stream.read() moves to the next byte, and returns an integer value of the byte.  a value of -1 signals the EOF
> 			if(read == prefix[pos]) {								// is the last byte read the same as the first byte in the prefix?
> 			pos++;													
> 				if(pos == prefix.length) {								
> 					stream.skip(11);										// skip the 13 bytes of the prefix which can vary.
> 					int length = stream.read();								// Set the next byte equal to the length of text in the user input field, see PRT schema
> 					stream.skip(1);											
> 					byte[] text = new byte[length];							// a new byte array called text is created.  It should contain an array of integer values of the user inputted text.
> 					IOUtils.readFully(stream, text);						
> 					String str = new String(text, 0, text.length, "UTF-8");	// turn it into a string, but does not remove null termination, assumes it's found to be utf-8
> 					xhtml.startElement("p");	
> 					xhtml.characters(str);
> 					xhtml.endElement("p");
> 					pos--;  
> 				}
> 			} 
> 			else {
> 				//Did not find the prefix. Reset the position counter.
> 				pos = 0;
> 			}
> 		}
> 	}
> 		
> 	/**
>     * @deprecated This method will be removed in Apache Tika 1.0.
>     */
>     public void parse(
>                    InputStream stream, ContentHandler handler, Metadata metadata)
>                    throws IOException, SAXException, TikaException {
>                 parse(stream, handler, metadata, new ParseContext());
>     }
> }{code}   
>  

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