Re-introduce code to use the ICU data file in the iOS app bundle

We used to have this code snippet in the TiledLibreOffice app back in
the days. Then in LibreOfficeLight it was lost and forgotten (?).

Clearly we need to tell ICU abouyt the data that we include as a
separate file in iOS apps, and presumably any iOS app will be a
LibreOffficeKit-based one, so let's do the initialistion here.

Change-Id: Ib08dc9d7386789d10e8c53114e79d0b5beab7232

desktop/Library_sofficeapp.mk

@@ -99,9 +99,15 @@ $(eval $(call gb_Library_use_system_darwin_frameworks,sofficeapp,\
 endif
 
 ifeq ($(OS),IOS)
+
 $(eval $(call gb_Library_add_cflags,sofficeapp,\
     $(gb_OBJCFLAGS) \
 ))
+
+$(eval $(call gb_Library_add_cxxflags,sofficeapp,\
+    $(gb_OBJCXXFLAGS) \
+))
+
 endif
 
 $(eval $(call gb_Library_add_exception_objects,sofficeapp,\

desktop/source/lib/init.cxx

-/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
 /*
  * This file is part of the LibreOffice project.
  *
@@ -13,6 +13,16 @@
 #include <string.h>
 #include <stdlib.h>
 
+#ifdef IOS
+#include <sys/mman.h>
+#include <sys/stat.h>
+#include <unicode/udata.h>
+#include <unicode/ucnv.h>
+#include <premac.h>
+#import <Foundation/Foundation.h>
+#include <postmac.h>
+#endif
+
 #include <algorithm>
 #include <memory>
 #include <iostream>
@@ -3871,6 +3881,45 @@ static int lo_initialize(LibreOfficeKit* pThis, const char* pAppPath, const char
     if (osl::FileBase::getFileURLFromSystemPath(aAppPath, aAppURL) != osl::FileBase::E_None)
         return 0;
 
+#ifdef IOS
+    // A LibreOffice-using iOS app should have the ICU data file in the app bundle. Initialize ICU
+    // to use that.
+    NSString *bundlePath = [[NSBundle mainBundle] bundlePath];
+
+    int fd = open([[bundlePath stringByAppendingPathComponent:@U_ICUDATA_NAME".dat"] UTF8String], O_RDONLY);
+    if (fd == -1)
+        NSLog(@"Could not open ICU data file %s", [[bundlePath stringByAppendingPathComponent:@U_ICUDATA_NAME".dat"] UTF8String]);
+    else
+    {
+        struct stat st;
+        if (fstat(fd, &st) == -1)
+            NSLog(@"fstat on ICU data file failed: %s", strerror(errno));
+        else
+        {
+            void *icudata = mmap(0, (size_t) st.st_size, PROT_READ, MAP_FILE|MAP_PRIVATE, fd, 0);
+            if (icudata == MAP_FAILED)
+                NSLog(@"mmap failed: %s", strerror(errno));
+            else
+            {
+                UErrorCode icuStatus = U_ZERO_ERROR;
+                udata_setCommonData(icudata, &icuStatus);
+                if (U_FAILURE(icuStatus))
+                    NSLog(@"udata_setCommonData failed");
+                else
+                {
+                    // Quick test that ICU works...
+                    UConverter *cnv = ucnv_open("iso-8859-3", &icuStatus);
+                    NSLog(@"ucnv_open(iso-8859-3)-> %p, err = %s, name=%s",
+                          (void *)cnv, u_errorName(icuStatus), (!cnv)?"?":ucnv_getName(cnv,&icuStatus));
+                    if (U_SUCCESS(icuStatus))
+                        ucnv_close(cnv);
+                }
+            }
+        }
+        close(fd);
+    }
+#endif
+
     try
     {
         if (eStage != SECOND_INIT)