From 929f77ced2af9f02b307ebd692bc1cacc0b986bf Mon Sep 17 00:00:00 2001
From: Peter Osterlund <peterosterlund2@gmail.com>
Date: Tue, 29 Dec 2015 10:24:54 +0100
Subject: [PATCH] DroidFish: Added "secret" way to allocate an unsafely large
 hash table.

---
 DroidFish/src/org/petero/droidfish/DroidFish.java   | 13 +++++--------
 .../src/org/petero/droidfish/EngineOptions.java     |  4 ++++
 .../org/petero/droidfish/engine/ExternalEngine.java |  9 +++++----
 3 files changed, 14 insertions(+), 12 deletions(-)

diff --git a/DroidFish/src/org/petero/droidfish/DroidFish.java b/DroidFish/src/org/petero/droidfish/DroidFish.java
index af1ed57..e5a7de5 100644
--- a/DroidFish/src/org/petero/droidfish/DroidFish.java
+++ b/DroidFish/src/org/petero/droidfish/DroidFish.java
@@ -1048,27 +1048,24 @@ public class DroidFish extends Activity implements GUIInterface {
         bookOptions.random = (settings.getInt("bookRandom", 500) - 500) * (3.0 / 500);
         setBookOptions();
 
+        File extDir = Environment.getExternalStorageDirectory();
+        String sep = File.separator;
         engineOptions.hashMB = getIntSetting("hashMB", 16);
+        engineOptions.unSafeHash = new File(extDir + sep + engineDir + sep + ".unsafehash").exists();
         engineOptions.hints = settings.getBoolean("tbHints", false);
         engineOptions.hintsEdit = settings.getBoolean("tbHintsEdit", false);
         engineOptions.rootProbe = settings.getBoolean("tbRootProbe", true);
         engineOptions.engineProbe = settings.getBoolean("tbEngineProbe", true);
 
         String gtbPath = settings.getString("gtbPath", "").trim();
-        if (gtbPath.length() == 0) {
-            File extDir = Environment.getExternalStorageDirectory();
-            String sep = File.separator;
+        if (gtbPath.length() == 0)
             gtbPath = extDir.getAbsolutePath() + sep + gtbDefaultDir;
-        }
         engineOptions.gtbPath = gtbPath;
         String gtbPathNet = settings.getString("gtbPathNet", "").trim();
         engineOptions.gtbPathNet = gtbPathNet;
         String rtbPath = settings.getString("rtbPath", "").trim();
-        if (rtbPath.length() == 0) {
-            File extDir = Environment.getExternalStorageDirectory();
-            String sep = File.separator;
+        if (rtbPath.length() == 0)
             rtbPath = extDir.getAbsolutePath() + sep + rtbDefaultDir;
-        }
         engineOptions.rtbPath = rtbPath;
         String rtbPathNet = settings.getString("rtbPathNet", "").trim();
         engineOptions.rtbPathNet = rtbPathNet;
diff --git a/DroidFish/src/org/petero/droidfish/EngineOptions.java b/DroidFish/src/org/petero/droidfish/EngineOptions.java
index aa8eeb1..d4ab754 100644
--- a/DroidFish/src/org/petero/droidfish/EngineOptions.java
+++ b/DroidFish/src/org/petero/droidfish/EngineOptions.java
@@ -21,6 +21,7 @@ package org.petero.droidfish;
 /** Engine options, including endgame tablebase probing options. */
 public final class EngineOptions {
     public int hashMB;          // Engine hash table size in MB
+    public boolean unSafeHash;  // True if allocating very large hash is allowed
     public boolean hints;       // Hints when playing/analyzing
     public boolean hintsEdit;   // Hints in "edit board" mode
     public boolean rootProbe;   // Only search optimal moves at root
@@ -33,6 +34,7 @@ public final class EngineOptions {
 
     public EngineOptions() {
         hashMB = 16;
+        unSafeHash = false;
         hints = false;
         hintsEdit = false;
         rootProbe = false;
@@ -46,6 +48,7 @@ public final class EngineOptions {
 
     public EngineOptions(EngineOptions other) {
         hashMB = other.hashMB;
+        unSafeHash = other.unSafeHash;
         hints = other.hints;
         hintsEdit = other.hintsEdit;
         rootProbe = other.rootProbe;
@@ -78,6 +81,7 @@ public final class EngineOptions {
         EngineOptions other = (EngineOptions)o;
 
         return ((hashMB == other.hashMB) &&
+                (unSafeHash == other.unSafeHash) &&
                 (hints == other.hints) &&
                 (hintsEdit == other.hintsEdit) &&
                 (rootProbe == other.rootProbe) &&
diff --git a/DroidFish/src/org/petero/droidfish/engine/ExternalEngine.java b/DroidFish/src/org/petero/droidfish/engine/ExternalEngine.java
index 839f651..eb8403b 100644
--- a/DroidFish/src/org/petero/droidfish/engine/ExternalEngine.java
+++ b/DroidFish/src/org/petero/droidfish/engine/ExternalEngine.java
@@ -205,7 +205,7 @@ public class ExternalEngine extends UCIEngineBase {
     @Override
     public void initOptions(EngineOptions engineOptions) {
         super.initOptions(engineOptions);
-        hashMB = getHashMB(engineOptions.hashMB);
+        hashMB = getHashMB(engineOptions);
         setOption("Hash", hashMB);
         syzygyPath = engineOptions.getEngineRtbPath(false);
         setOption("SyzygyPath", syzygyPath);
@@ -220,8 +220,9 @@ public class ExternalEngine extends UCIEngineBase {
     }
 
     /** Reduce too large hash sizes. */
-    private final int getHashMB(int hashMB) {
-        if (hashMB > 16) {
+    private final static int getHashMB(EngineOptions engineOptions) {
+        int hashMB = engineOptions.hashMB;
+        if (hashMB > 16 && !engineOptions.unSafeHash) {
             int maxMem = (int)(Runtime.getRuntime().maxMemory() / (1024*1024));
             if (maxMem < 16)
                 maxMem = 16;
@@ -236,7 +237,7 @@ public class ExternalEngine extends UCIEngineBase {
     public boolean optionsOk(EngineOptions engineOptions) {
         if (!optionsInitialized)
             return true;
-        if (hashMB != getHashMB(engineOptions.hashMB))
+        if (hashMB != getHashMB(engineOptions))
             return false;
         if (hasOption("gaviotatbpath") && !gaviotaTbPath.equals(engineOptions.getEngineGtbPath(false)))
             return false;