From dcf600a5c1b4810a76370e33761c137eb22f5492 Mon Sep 17 00:00:00 2001
From: Brian Stell <bstell@google.com>
Date: Mon, 22 Jun 2015 22:14:24 -0700
Subject: [PATCH] Add code to read the closure data.

---
 .../googlei18n/tachyfont/GetCharData.java     | 60 ++++++++++++++++++-
 1 file changed, 59 insertions(+), 1 deletion(-)

diff --git a/run_time/src/gae_java/TachyFont/src/com/github/googlei18n/tachyfont/GetCharData.java b/run_time/src/gae_java/TachyFont/src/com/github/googlei18n/tachyfont/GetCharData.java
index b7abd865..457b240e 100644
--- a/run_time/src/gae_java/TachyFont/src/com/github/googlei18n/tachyfont/GetCharData.java
+++ b/run_time/src/gae_java/TachyFont/src/com/github/googlei18n/tachyfont/GetCharData.java
@@ -1,12 +1,16 @@
 package com.github.googlei18n.tachyfont;
 
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
 import java.io.DataInputStream;
 import java.io.IOException;
 import java.io.InputStream;
 import java.util.HashMap;
+import java.util.HashSet;
 import java.util.Iterator;
 import java.util.Map;
 import java.util.Map.Entry;
+import java.util.Set;
 import java.util.jar.JarEntry;
 import java.util.jar.JarFile;
 
@@ -22,8 +26,19 @@ public void doGet(HttpServletRequest req, HttpServletResponse resp) throws IOExc
     JarFile jarFile = new JarFile("WEB-INF/" + jarFilename);
     Map<Integer, Integer> cmapMap = getCmapMap(jarFile);
     Iterator<Entry<Integer, Integer>> cmapIterator = cmapMap.entrySet().iterator();
+    resp.getWriter().println("code to gid:");
     while (cmapIterator.hasNext()) {
       Entry<Integer, Integer> pair = cmapIterator.next();
+      resp.getWriter().println("  " + pair.getKey() + " = " + pair.getValue());
+    }
+
+    Map<Integer, Set<Integer>> closureMap = getClosureMap(jarFile);
+    Iterator<Entry<Integer, Set<Integer>>> closureMapIterator =
+        closureMap.entrySet().iterator();
+    resp.getWriter().println("gid to closure:");
+    while (closureMapIterator.hasNext()) {
+      Entry<Integer, Set<Integer>> pair = closureMapIterator.next();
+      // TODO(bstell): this is not yet debugged.
       resp.getWriter().println(pair.getKey() + " = " + pair.getValue());
     }
 
@@ -34,7 +49,8 @@ public void doGet(HttpServletRequest req, HttpServletResponse resp) throws IOExc
     // TODO(bstell): create and return the glyph bundle.
     jarFile.close();
   }
-  private HashMap<Integer, Integer> getCmapMap(JarFile jarFile) throws IOException {
+
+  private Map<Integer, Integer> getCmapMap(JarFile jarFile) throws IOException {
     JarEntry codePointsJarEntry = jarFile.getJarEntry("codepoints");
     InputStream codePointsStream = jarFile.getInputStream(codePointsJarEntry);
     DataInputStream codePointsDataStream = new DataInputStream(codePointsStream);
@@ -51,4 +67,46 @@ private HashMap<Integer, Integer> getCmapMap(JarFile jarFile) throws IOException
     }
     return cmapMap;
   }
+
+  private Map<Integer, Set<Integer>> getClosureMap(JarFile jarFile) throws IOException {
+    JarEntry closureIndexJarEntry = jarFile.getJarEntry("closure_idx");
+    InputStream closureIndexStream = jarFile.getInputStream(closureIndexJarEntry);
+    DataInputStream closureIndexDataStream = new DataInputStream(closureIndexStream);
+
+    JarEntry closureDataJarEntry = jarFile.getJarEntry("closure_data");
+    InputStream closureDataStream = jarFile.getInputStream(closureDataJarEntry);
+    int closureDataSize = closureDataStream.available();
+    ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
+    byte[] buffer = new byte[closureDataSize];
+    int readLength;
+    while ((readLength = closureDataStream.read(buffer, 0, closureDataSize)) != -1)
+      byteArrayOutputStream.write(buffer, 0, readLength);
+    buffer = byteArrayOutputStream.toByteArray();
+
+    ByteArrayInputStream closureDataByteArrayInputStream =
+        new ByteArrayInputStream(buffer);
+    DataInputStream closureDataInputStream =
+        new DataInputStream(closureDataByteArrayInputStream);
+    HashMap<Integer, Set<Integer>> closureMap = new HashMap<Integer, Set<Integer>>();
+    Integer gid = -1;
+    while (closureIndexDataStream.available() > 0) {
+      gid++;
+      Integer offset = closureIndexDataStream.readInt();
+      Integer size = closureIndexDataStream.readUnsignedShort();
+      if (size == 0) {
+        continue;
+      }
+      // TODO(bstell): the following is not yet debugged.
+      Set<Integer> closureGids = new HashSet<Integer>();
+      closureDataByteArrayInputStream.reset();
+      closureDataByteArrayInputStream.skip(offset);
+      while (size > 0) {
+        Integer closureGid = closureDataInputStream.readUnsignedShort();
+        closureGids.add(closureGid);
+        size -= 2;
+      }
+      closureMap.put(gid, closureGids);
+    }
+    return closureMap;
+  }
 }