First commit

README.md

@@ -1,2 +1,26 @@
 # zipdoc
 Git textconv program to dump a zip file's text contents to stdout
+
+## Install
+Store Zipdoc.class somewhere in your home directory, for example ~/bin.
+
+Define the diff filter in ~/.gitconfig :
+```
+git config --global --replace-all diff.zipdoc.textconv "java -cp ~/bin Zipdoc"
+```
+
+Assign diff attributes to paths in .gitattributes:  (also assigning the [rezip filter](https://github.com/costerwi/rezip) for efficient storage)
+```
+# MS Office
+*.docx  filter=zip diff=zipdoc
+*.xlsx  filter=zip diff=zipdoc
+*.pptx  filter=zip diff=zipdoc
+# OpenOffice
+*.odt   filter=zip diff=zipdoc
+*.ods   filter=zip diff=zipdoc
+*.odp   filter=zip diff=zipdoc
+# Misc
+*.mcdx  filter=zip diff=zipdoc
+*.slx   filter=zip diff=zipdoc
+```
+

Zipdoc.java

@@ -0,0 +1,70 @@
+import java.io.*;
+import java.util.zip.*;
+
+import org.xml.sax.InputSource;
+import javax.xml.transform.OutputKeys;
+import javax.xml.transform.Source;
+import javax.xml.transform.Transformer;
+import javax.xml.transform.sax.SAXSource;
+import javax.xml.transform.sax.SAXTransformerFactory;
+import javax.xml.transform.stream.StreamResult;
+import javax.xml.transform.TransformerException;
+
+public class Zipdoc {
+    /**
+     * Read specified zip document file and output text to stdout.
+     *
+     * The program takes aa single argument, the name of the file to convert,
+     * and produces resulting text on stdout.
+     * {@link https://github.com/costerwi/zipdoc}
+     */
+    public static void main(String argv[]) throws IOException, TransformerException {
+        if (1 != argv.length) {
+            System.err.println("Usage: Zipdoc infile >textconv.txt");
+            System.exit(1);
+        }
+        ZipInputStream source_zip = new ZipInputStream(new FileInputStream(argv[0]));
+
+        Transformer serializer = SAXTransformerFactory.newInstance().newTransformer();
+        serializer.setOutputProperty(OutputKeys.INDENT, "yes");
+        serializer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "yes");
+        serializer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "2");
+
+        byte[] buffer = new byte[8192];
+        ZipEntry entry;
+        ByteArrayOutputStream uncomp_bs = new ByteArrayOutputStream();
+        CRC32 cksum = new CRC32();
+        CheckedOutputStream uncomp_os = new CheckedOutputStream(uncomp_bs, cksum);
+        try {
+            while ((entry = source_zip.getNextEntry()) != null) {
+                uncomp_bs.reset();
+                cksum.reset();
+
+                System.out.println("Subfile:\t" + entry);
+
+                // Copy file from source_zip into uncompressed, checksummed output stream
+                int len = 0;
+                while ((len = source_zip.read(buffer)) > 0) {
+                    uncomp_os.write(buffer, 0, len);
+                }
+                source_zip.closeEntry();
+
+                if (entry.getName().endsWith(".xml")) {
+                    // xml file: pretty-print the data to stdout
+                    InputSource in = new InputSource(new ByteArrayInputStream(uncomp_bs.toByteArray()));
+                    serializer.transform(new SAXSource(in), new StreamResult(System.out));
+                } else if (entry.getName().endsWith(".txt")) {
+                    // Text file: dump directly to stdout
+                    uncomp_bs.writeTo(System.out);
+                } else {
+                    // Unknown file type: report uncompressed size and CRC32
+                    System.out.println("Filesize:\t" + uncomp_bs.size());
+                    System.out.println("Checksum:\t" + Long.toHexString(cksum.getValue()));
+                }
+                System.out.println();
+            }
+        } finally {
+            source_zip.close();
+        }
+    }
+}