diff -Naur icu-50.1/layout/LEFontInstance.h icu-50.1.1/layout/LEFontInstance.h
--- icu-50.1/layout/LEFontInstance.h	2013-01-19 04:55:01.959370739 +0100
+++ icu-50.1.1/layout/LEFontInstance.h	2013-01-19 04:56:28.450366883 +0100
@@ -1,7 +1,7 @@
 
 /*
  *
- * (C) Copyright IBM Corp. 1998-2007 - All Rights Reserved
+ * (C) Copyright IBM Corp. 1998-2012 - All Rights Reserved
  *
  */
 
@@ -166,6 +166,25 @@
     virtual const void *getFontTable(LETag tableTag) const = 0;
 
     /**
+     * This method reads a table from the font. Note that in general,
+     * it only makes sense to call this method on an <code>LEFontInstance</code>
+     * which represents a physical font - i.e. one which has been returned by
+     * <code>getSubFont()</code>. This is because each subfont in a composite font
+     * will have different tables, and there's no way to know which subfont to access.
+     *
+     * Subclasses which represent composite fonts should always return <code>NULL</code>.
+     * 
+     * This version sets a length, for range checking.
+     *
+     * @param tableTag - the four byte table tag. (e.g. 'cmap') 
+     * @param length - ignored on entry, on exit will be the length of the table if known, or -1 if unknown.
+     * @return the address of the table in memory, or <code>NULL</code>
+     *         if the table doesn't exist.
+     * @internal
+     */
+    virtual const void* getFontTable(LETag tableTag, size_t &length) const { length=-1; return getFontTable(tableTag); }  /* -1 = unknown length */
+
+    /**
      * This method is used to determine if the font can
      * render the given character. This can usually be done
      * by looking the character up in the font's character
diff -Naur icu-50.1/layout/LETypes.h icu-50.1.1/layout/LETypes.h
--- icu-50.1/layout/LETypes.h	2013-01-19 04:55:01.930370740 +0100
+++ icu-50.1.1/layout/LETypes.h	2013-01-19 04:56:28.449366883 +0100
@@ -1,6 +1,6 @@
 /*
  *
- * (C) Copyright IBM Corp. 1998-2011 - All Rights Reserved
+ * (C) Copyright IBM Corp. 1998-2012 - All Rights Reserved
  *
  */
 
@@ -309,6 +309,51 @@
  * @internal
  */
 #define LE_DELETE_ARRAY(array) uprv_free((void *) (array))
+#else
+
+/* Not using ICU memory - use C std lib versions */
+
+#include <stdlib.h>
+#include <string.h>
+
+/**
+ * A convenience macro to get the length of an array.
+ *
+ * @internal
+ */
+#define LE_ARRAY_SIZE(array) (sizeof array / sizeof array[0])
+
+/**
+ * A convenience macro for copying an array.
+ *
+ * @internal
+ */
+#define LE_ARRAY_COPY(dst, src, count) memcpy((void *) (dst), (void *) (src), (count) * sizeof (src)[0])
+
+/**
+ * Allocate an array of basic types. This is used to isolate the rest of
+ * the LayoutEngine code from cmemory.h.
+ *
+ * @internal
+ */
+#define LE_NEW_ARRAY(type, count) (type *) malloc((count) * sizeof(type))
+
+/**
+ * Re-allocate an array of basic types. This is used to isolate the rest of
+ * the LayoutEngine code from cmemory.h.
+ *
+ * @internal
+ */
+#define LE_GROW_ARRAY(array, newSize) realloc((void *) (array), (newSize) * sizeof (array)[0])
+
+ /**
+ * Free an array of basic types. This is used to isolate the rest of
+ * the LayoutEngine code from cmemory.h.
+ *
+ * @internal
+ */
+#define LE_DELETE_ARRAY(array) free((void *) (array))
+
 #endif
 #endif  /* U_HIDE_INTERNAL_API */
 
diff -Naur icu-50.1/unicode/decimfmt.h icu-50.1.1/unicode/decimfmt.h
--- icu-50.1/unicode/decimfmt.h	2013-01-19 04:55:01.177370774 +0100
+++ icu-50.1.1/unicode/decimfmt.h	2013-01-19 04:56:28.413366884 +0100
@@ -38,6 +38,7 @@
 #include "unicode/fpositer.h"
 #include "unicode/stringpiece.h"
 #include "unicode/curramt.h"
+#include "unicode/enumset.h"
 
 /**
  * \def UNUM_DECIMALFORMAT_INTERNAL_SIZE
@@ -56,39 +57,12 @@
 class UnicodeSet;
 class FieldPositionHandler;
 
-/**
- * enum bitset for boolean fields. Similar to Java EnumSet<>. 
- * Needs to range check. Not specific to decimal format.
- * @internal
- */
-template<typename T, uint32_t minValue, uint32_t limitValue>
-class EnumSet {
-public:
-    EnumSet() : fBools(0) {}
-    EnumSet(const EnumSet<T,minValue,limitValue>& other) : fBools(other.fBools) {}
-    ~EnumSet() {}
-    void clear() { fBools=0; }
-    void add(T toAdd) { set(toAdd, 1); }
-    void remove(T toRemove) { set(toRemove, 0); }
-    int32_t contains(T toCheck) const { return get(toCheck); }
-    void set(T toSet, int32_t v) { fBools=(fBools&(~flag(toSet)))|(v?(flag(toSet)):0); }
-    int32_t get(T toCheck) const { return (fBools & flag(toCheck))?1:0; }
-    UBool isValidEnum(T toCheck) const {  return (toCheck>=minValue&&toCheck<limitValue); }
-    UBool isValidValue(int32_t v) const { return (v==0||v==1); }
-    const EnumSet<T,minValue,limitValue>& operator=(const EnumSet<T,minValue,limitValue>& other) {
-        fBools = other.fBools;
-        return *this;
-    }
-  
-    uint32_t getAll() const {
-        return fBools; 
-    }
-
-private:
-    uint32_t flag(T toCheck) const { return (1<<(toCheck-minValue)); }
-private:
-    uint32_t fBools;
-};
+// explicit template instantiation. see digitlst.h
+#if defined (_MSC_VER)
+template class U_I18N_API    EnumSet<UNumberFormatAttribute,
+            UNUM_MAX_NONBOOLEAN_ATTRIBUTE+1, 
+            UNUM_LIMIT_BOOLEAN_ATTRIBUTE>;
+#endif
 
 /**
  * DecimalFormat is a concrete subclass of NumberFormat that formats decimal
diff -Naur icu-50.1/unicode/dtfmtsym.h icu-50.1.1/unicode/dtfmtsym.h
--- icu-50.1/unicode/dtfmtsym.h	2013-01-19 04:55:01.322370767 +0100
+++ icu-50.1.1/unicode/dtfmtsym.h	2013-01-19 04:56:28.415366884 +0100
@@ -25,6 +25,7 @@
 #include "unicode/calendar.h"
 #include "unicode/uobject.h"
 #include "unicode/locid.h"
+#include "unicode/udat.h"
 #include "unicode/ures.h"
 
 /**
@@ -802,6 +803,22 @@
      * Delete just the zone strings.
      */
     void disposeZoneStrings(void);
+
+    /**
+     * Returns the date format field index of the pattern character c,
+     * or UDAT_FIELD_COUNT if c is not a pattern character.
+     */
+    static UDateFormatField U_EXPORT2 getPatternCharIndex(UChar c);
+
+    /**
+     * Returns TRUE if f (with its pattern character repeated count times) is a numeric field.
+     */
+    static UBool U_EXPORT2 isNumericField(UDateFormatField f, int32_t count);
+
+    /**
+     * Returns TRUE if c (repeated count times) is the pattern character for a numeric field.
+     */
+    static UBool U_EXPORT2 isNumericPatternChar(UChar c, int32_t count);
 };
 
 U_NAMESPACE_END
diff -Naur icu-50.1/unicode/enumset.h icu-50.1.1/unicode/enumset.h
--- icu-50.1/unicode/enumset.h	1970-01-01 01:00:00.000000000 +0100
+++ icu-50.1.1/unicode/enumset.h	2013-01-19 04:56:28.416366884 +0100
@@ -0,0 +1,61 @@
+/*
+******************************************************************************
+*
+*   Copyright (C) 2012, International Business Machines
+*   Corporation and others.  All Rights Reserved.
+*
+******************************************************************************
+*/
+
+/**
+ * \file
+ * \brief C++: internal template EnumSet<>
+ */
+
+#ifndef ENUMSET_H
+#define ENUMSET_H
+
+#include "unicode/utypes.h"
+
+#if U_SHOW_CPLUSPLUS_API
+
+U_NAMESPACE_BEGIN
+
+/**
+ * enum bitset for boolean fields. Similar to Java EnumSet<>. 
+ * Needs to range check.
+ * @internal
+ */
+template<typename T, uint32_t minValue, uint32_t limitValue>
+class EnumSet {
+public:
+    inline EnumSet() : fBools(0) {}
+    inline EnumSet(const EnumSet<T,minValue,limitValue>& other) : fBools(other.fBools) {}
+    inline ~EnumSet() {}
+    inline void clear() { fBools=0; }
+    inline void add(T toAdd) { set(toAdd, 1); }
+    inline void remove(T toRemove) { set(toRemove, 0); }
+    inline int32_t contains(T toCheck) const { return get(toCheck); }
+    inline void set(T toSet, int32_t v) { fBools=(fBools&(~flag(toSet)))|(v?(flag(toSet)):0); }
+    inline int32_t get(T toCheck) const { return (fBools & flag(toCheck))?1:0; }
+    inline UBool isValidEnum(T toCheck) const {  return (toCheck>=minValue&&toCheck<limitValue); }
+    inline UBool isValidValue(int32_t v) const { return (v==0||v==1); }
+    inline const EnumSet<T,minValue,limitValue>& operator=(const EnumSet<T,minValue,limitValue>& other) {
+        fBools = other.fBools;
+        return *this;
+    }
+  
+    inline uint32_t getAll() const {
+        return fBools; 
+    }
+
+private:
+    inline uint32_t flag(T toCheck) const { return (1<<(toCheck-minValue)); }
+private:
+    uint32_t fBools;
+};
+
+U_NAMESPACE_END
+
+#endif /* U_SHOW_CPLUSPLUS_API */
+#endif /* ENUMSET_H */
diff -Naur icu-50.1/unicode/fmtable.h icu-50.1.1/unicode/fmtable.h
--- icu-50.1/unicode/fmtable.h	2013-01-19 04:55:01.720370749 +0100
+++ icu-50.1.1/unicode/fmtable.h	2013-01-19 04:56:28.432366884 +0100
@@ -32,6 +32,16 @@
 class DigitList;
 
 /**
+ * \def UNUM_INTERNAL_STACKARRAY_SIZE
+ * @internal
+ */
+#if U_PLATFORM == U_PF_OS400
+#define UNUM_INTERNAL_STACKARRAY_SIZE 144
+#else
+#define UNUM_INTERNAL_STACKARRAY_SIZE 128
+#endif
+
+/**
  * Formattable objects can be passed to the Format class or
  * its subclasses for formatting.  Formattable is a thin wrapper
  * class which interconverts between the primitive numeric types
@@ -649,7 +659,7 @@
 
     DigitList            *fDecimalNum;
 
-    char                fStackData[128]; // must be big enough for DigitList
+    char                fStackData[UNUM_INTERNAL_STACKARRAY_SIZE]; // must be big enough for DigitList
 
     Type                fType;
     UnicodeString       fBogus; // Bogus string when it's needed.
diff -Naur icu-50.1/unicode/locid.h icu-50.1.1/unicode/locid.h
--- icu-50.1/unicode/locid.h	2013-01-19 04:55:01.504370759 +0100
+++ icu-50.1.1/unicode/locid.h	2013-01-19 04:56:28.430366884 +0100
@@ -739,7 +739,7 @@
      * A friend to allow the default locale to be set by either the C or C++ API.
      * @internal
      */
-    friend void locale_set_default_internal(const char *);
+    friend Locale *locale_set_default_internal(const char *, UErrorCode& status);
 };
 
 inline UBool
diff -Naur icu-50.1/unicode/smpdtfmt.h icu-50.1.1/unicode/smpdtfmt.h
--- icu-50.1/unicode/smpdtfmt.h	2013-01-19 04:55:01.571370756 +0100
+++ icu-50.1.1/unicode/smpdtfmt.h	2013-01-19 04:56:28.430366884 +0100
@@ -946,6 +946,16 @@
     static UBool isNumeric(UChar formatChar, int32_t count);
 
     /**
+     * Returns TRUE if the patternOffset is at the start of a numeric field.
+     */
+    static UBool isAtNumericField(const UnicodeString &pattern, int32_t patternOffset);
+
+    /**
+     * Returns TRUE if the patternOffset is right after a non-numeric field.
+     */
+    static UBool isAfterNonNumericField(const UnicodeString &pattern, int32_t patternOffset);
+
+    /**
      * initializes fCalendar from parameters.  Returns fCalendar as a convenience.
      * @param adoptZone  Zone to be adopted, or NULL for TimeZone::createDefault().
      * @param locale Locale of the calendar
diff -Naur icu-50.1/unicode/uvernum.h icu-50.1.1/unicode/uvernum.h
--- icu-50.1/unicode/uvernum.h	2013-01-19 04:55:01.330370767 +0100
+++ icu-50.1.1/unicode/uvernum.h	2013-01-19 04:56:28.415366884 +0100
@@ -69,7 +69,7 @@
  *  This value will change in the subsequent releases of ICU
  *  @stable ICU 2.4
  */
-#define U_ICU_VERSION_PATCHLEVEL_NUM 0
+#define U_ICU_VERSION_PATCHLEVEL_NUM 1
 
 /** The current ICU build level version as an integer.  
  *  This value is for use by ICU clients. It defaults to 0.
@@ -118,7 +118,7 @@
  *  This value will change in the subsequent releases of ICU
  *  @stable ICU 2.4
  */
-#define U_ICU_VERSION "50.1"
+#define U_ICU_VERSION "50.1.1"
 
 /** The current ICU library major/minor version as a string without dots, for library name suffixes. 
  *  This value will change in the subsequent releases of ICU