diff --git a/include/androidfw/ResourceTypes.h b/include/androidfw/ResourceTypes.h
index 6799766..e79011f 100644
--- a/include/androidfw/ResourceTypes.h
+++ b/include/androidfw/ResourceTypes.h
@@ -808,6 +808,19 @@
     uint32_t lastPublicKey;
 };
 
+// The most specific locale can consist of:
+//
+// - a 3 char language code
+// - a 3 char region code prefixed by a 'r'
+// - a 4 char script code prefixed by a 's'
+// - a 8 char variant code prefixed by a 'v'
+//
+// each separated by a single char separator, which sums up to a total of 24
+// chars, (25 include the string terminator) rounded up to 28 to be 4 byte
+// aligned.
+#define RESTABLE_MAX_LOCALE_LEN 28
+
+
 /**
  * Describes a particular resource configuration.
  */
@@ -828,10 +841,42 @@
     
     union {
         struct {
-            // \0\0 means "any".  Otherwise, en, fr, etc.
+            // This field can take three different forms:
+            // - \0\0 means "any".
+            //
+            // - Two 7 bit ascii values interpreted as ISO-639-1 language
+            //   codes ('fr', 'en' etc. etc.). The high bit for both bytes is
+            //   zero.
+            //
+            // - A single 16 bit little endian packed value representing an
+            //   ISO-639-2 3 letter language code. This will be of the form:
+            //
+            //   {1, t, t, t, t, t, s, s, s, s, s, f, f, f, f, f}
+            //
+            //   bit[0, 4] = first letter of the language code
+            //   bit[5, 9] = second letter of the language code
+            //   bit[10, 14] = third letter of the language code.
+            //   bit[15] = 1 always
+            //
+            // For backwards compatibility, languages that have unambiguous
+            // two letter codes are represented in that format.
+            //
+            // The layout is always bigendian irrespective of the runtime
+            // architecture.
             char language[2];
             
-            // \0\0 means "any".  Otherwise, US, CA, etc.
+            // This field can take three different forms:
+            // - \0\0 means "any".
+            //
+            // - Two 7 bit ascii values interpreted as 2 letter region
+            //   codes ('US', 'GB' etc.). The high bit for both bytes is zero.
+            //
+            // - An UN M.49 3 digit region code. For simplicity, these are packed
+            //   in the same manner as the language codes, though we should need
+            //   only 10 bits to represent them, instead of the 15.
+            //
+            // The layout is always bigendian irrespective of the runtime
+            // architecture.
             char country[2];
         };
         uint32_t locale;
@@ -933,7 +978,7 @@
         SDKVERSION_ANY = 0
     };
     
-    enum {
+  enum {
         MINORVERSION_ANY = 0
     };
     
@@ -1006,6 +1051,15 @@
         uint32_t screenSizeDp;
     };
 
+    // The ISO-15924 short name for the script corresponding to this
+    // configuration. (eg. Hant, Latn, etc.). Interpreted in conjunction with
+    // the locale field
+    char localeScript[4];
+
+    // A single BCP-47 variant subtag. Will vary in length between 5 and 8
+    // chars. Interpreted in conjunction with the locale field.
+    char localeVariant[8];
+
     void copyFromDeviceNoSwap(const ResTable_config& o);
     
     void copyFromDtoH(const ResTable_config& o);
@@ -1063,7 +1117,33 @@
     // settings is the requested settings
     bool match(const ResTable_config& settings) const;
 
-    void getLocale(char str[6]) const;
+    // Get the string representation of the locale component of this
+    // Config. This will contain the language along with the prefixed script,
+    // region and variant of this config, separated by underscores.
+    //
+    // 'r' is the region prefix, 's' is the script prefix and 'v' is the
+    // variant prefix.
+    //
+    // Example: en_rUS, en_sLatn_rUS, en_vPOSIX.
+    void getLocale(char str[RESTABLE_MAX_LOCALE_LEN]) const;
+    // Get the 2 or 3 letter language code of this configuration. Trailing
+    // bytes are set to '\0'.
+    size_t unpackLanguage(char language[4]) const;
+    // Get the 2 or 3 letter language code of this configuration. Trailing
+    // bytes are set to '\0'.
+    size_t unpackRegion(char region[4]) const;
+
+    // Sets the language code of this configuration from |language|. If |language|
+    // is a 2 letter code, the trailing byte is expected to be '\0'.
+    void packLanguage(const char language[3]);
+    // Sets the region code of this configuration from |region|. If |region|
+    // is a 2 letter code, the trailing byte is expected to be '\0'.
+    void packRegion(const char region[3]);
+
+    // Returns a positive integer if this config is more specific than |o|
+    // with respect to their locales, a negative integer if |o| is more specific
+    // and 0 if they're equally specific.
+    int isLocaleMoreSpecificThan(const ResTable_config &o) const;
 
     String8 toString() const;
 };
diff --git a/libs/androidfw/ResourceTypes.cpp b/libs/androidfw/ResourceTypes.cpp
index 72d331c..9e544e9 100644
--- a/libs/androidfw/ResourceTypes.cpp
+++ b/libs/androidfw/ResourceTypes.cpp
@@ -66,11 +66,6 @@
 // size measured in sizeof(uint32_t)
 #define IDMAP_HEADER_SIZE (ResTable::IDMAP_HEADER_SIZE_BYTES / sizeof(uint32_t))
 
-static void printToLogFunc(int32_t cookie, const char* txt)
-{
-    ALOGV("[cookie=%d] %s", cookie, txt);
-}
-
 // Standard C isspace() is only required to look at the low byte of its input, so
 // produces incorrect results for UTF-16 characters.  For safety's sake, assume that
 // any high-byte UTF-16 code point is not whitespace.
@@ -1539,6 +1534,71 @@
     }
 }
 
+/* static */ size_t unpackLanguageOrRegion(const char in[2], const char base,
+        char out[4]) {
+  if (in[0] & 0x80) {
+      // The high bit is "1", which means this is a packed three letter
+      // language code.
+
+      // The smallest 5 bits of the second char are the first alphabet.
+      const uint8_t first = in[1] & 0x1f;
+      // The last three bits of the second char and the first two bits
+      // of the first char are the second alphabet.
+      const uint8_t second = ((in[1] & 0xe0) >> 5) + ((in[0] & 0x03) << 3);
+      // Bits 3 to 7 (inclusive) of the first char are the third alphabet.
+      const uint8_t third = (in[0] & 0x7c) >> 2;
+
+      out[0] = first + base;
+      out[1] = second + base;
+      out[2] = third + base;
+      out[3] = 0;
+
+      return 3;
+  }
+
+  if (in[0]) {
+      memcpy(out, in, 2);
+      memset(out + 2, 0, 2);
+      return 2;
+  }
+
+  memset(out, 0, 4);
+  return 0;
+}
+
+/* static */ void packLanguageOrRegion(const char in[3], const char base,
+        char out[2]) {
+  if (in[2] == 0) {
+      out[0] = in[0];
+      out[1] = in[1];
+  } else {
+      uint8_t first = (in[0] - base) & 0x00ef;
+      uint8_t second = (in[1] - base) & 0x00ef;
+      uint8_t third = (in[2] - base) & 0x00ef;
+
+      out[0] = (0x80 | (third << 2) | (second >> 3));
+      out[1] = ((second << 5) | first);
+  }
+}
+
+
+void ResTable_config::packLanguage(const char language[3]) {
+    packLanguageOrRegion(language, 'a', this->language);
+}
+
+void ResTable_config::packRegion(const char region[3]) {
+    packLanguageOrRegion(region, '0', this->country);
+}
+
+size_t ResTable_config::unpackLanguage(char language[4]) const {
+    return unpackLanguageOrRegion(this->language, 'a', language);
+}
+
+size_t ResTable_config::unpackRegion(char region[4]) const {
+    return unpackLanguageOrRegion(this->country, '0', region);
+}
+
+
 void ResTable_config::copyFromDtoH(const ResTable_config& o) {
     copyFromDeviceNoSwap(o);
     size = sizeof(ResTable_config);
@@ -1568,10 +1628,30 @@
     screenHeightDp = htods(screenHeightDp);
 }
 
+/* static */ inline int compareLocales(const ResTable_config &l, const ResTable_config &r) {
+    if (l.locale != r.locale) {
+        // NOTE: This is the old behaviour with respect to comparison orders.
+        // The diff value here doesn't make much sense (given our bit packing scheme)
+        // but it's stable, and that's all we need.
+        return l.locale - r.locale;
+    }
+
+    // The language & region are equal, so compare the scripts and variants.
+    int script = memcmp(l.localeScript, r.localeScript, sizeof(l.localeScript));
+    if (script) {
+        return script;
+    }
+
+    // The language, region and script are equal, so compare variants.
+    //
+    // This should happen very infrequently (if at all.)
+    return memcmp(l.localeVariant, r.localeVariant, sizeof(l.localeVariant));
+}
+
 int ResTable_config::compare(const ResTable_config& o) const {
     int32_t diff = (int32_t)(imsi - o.imsi);
     if (diff != 0) return diff;
-    diff = (int32_t)(locale - o.locale);
+    diff = compareLocales(*this, o);
     if (diff != 0) return diff;
     diff = (int32_t)(screenType - o.screenType);
     if (diff != 0) return diff;
@@ -1598,18 +1678,15 @@
     if (mnc != o.mnc) {
         return mnc < o.mnc ? -1 : 1;
     }
-    if (language[0] != o.language[0]) {
-        return language[0] < o.language[0] ? -1 : 1;
+
+    int diff = compareLocales(*this, o);
+    if (diff < 0) {
+        return -1;
     }
-    if (language[1] != o.language[1]) {
-        return language[1] < o.language[1] ? -1 : 1;
+    if (diff > 0) {
+        return 1;
     }
-    if (country[0] != o.country[0]) {
-        return country[0] < o.country[0] ? -1 : 1;
-    }
-    if (country[1] != o.country[1]) {
-        return country[1] < o.country[1] ? -1 : 1;
-    }
+
     if ((screenLayout & MASK_LAYOUTDIR) != (o.screenLayout & MASK_LAYOUTDIR)) {
         return (screenLayout & MASK_LAYOUTDIR) < (o.screenLayout & MASK_LAYOUTDIR) ? -1 : 1;
     }
@@ -1656,7 +1733,6 @@
     int diffs = 0;
     if (mcc != o.mcc) diffs |= CONFIG_MCC;
     if (mnc != o.mnc) diffs |= CONFIG_MNC;
-    if (locale != o.locale) diffs |= CONFIG_LOCALE;
     if (orientation != o.orientation) diffs |= CONFIG_ORIENTATION;
     if (density != o.density) diffs |= CONFIG_DENSITY;
     if (touchscreen != o.touchscreen) diffs |= CONFIG_TOUCHSCREEN;
@@ -1671,9 +1747,44 @@
     if (uiMode != o.uiMode) diffs |= CONFIG_UI_MODE;
     if (smallestScreenWidthDp != o.smallestScreenWidthDp) diffs |= CONFIG_SMALLEST_SCREEN_SIZE;
     if (screenSizeDp != o.screenSizeDp) diffs |= CONFIG_SCREEN_SIZE;
+
+    const int diff = compareLocales(*this, o);
+    if (diff) diffs |= CONFIG_LOCALE;
+
     return diffs;
 }
 
+int ResTable_config::isLocaleMoreSpecificThan(const ResTable_config& o) const {
+    if (locale || o.locale) {
+        if (language[0] != o.language[0]) {
+            if (!language[0]) return -1;
+            if (!o.language[0]) return 1;
+        }
+
+        if (country[0] != o.country[0]) {
+            if (!country[0]) return -1;
+            if (!o.country[0]) return 1;
+        }
+    }
+
+    // There isn't a well specified "importance" order between variants and
+    // scripts. We can't easily tell whether, say "en-Latn-US" is more or less
+    // specific than "en-US-POSIX".
+    //
+    // We therefore arbitrarily decide to give priority to variants over
+    // scripts since it seems more useful to do so. We will consider
+    // "en-US-POSIX" to be more specific than "en-Latn-US".
+
+    const int score = ((localeScript[0] != 0) ? 1 : 0) +
+        ((localeVariant[0] != 0) ? 2 : 0);
+
+    const int oScore = ((o.localeScript[0] != 0) ? 1 : 0) +
+        ((o.localeVariant[0] != 0) ? 2 : 0);
+
+    return score - oScore;
+
+}
+
 bool ResTable_config::isMoreSpecificThan(const ResTable_config& o) const {
     // The order of the following tests defines the importance of one
     // configuration parameter over another.  Those tests first are more
@@ -1691,14 +1802,13 @@
     }
 
     if (locale || o.locale) {
-        if (language[0] != o.language[0]) {
-            if (!language[0]) return false;
-            if (!o.language[0]) return true;
+        const int diff = isLocaleMoreSpecificThan(o);
+        if (diff < 0) {
+            return false;
         }
 
-        if (country[0] != o.country[0]) {
-            if (!country[0]) return false;
-            if (!o.country[0]) return true;
+        if (diff > 0) {
+            return true;
         }
     }
 
@@ -1834,6 +1944,18 @@
             }
         }
 
+        if (localeScript[0] || o.localeScript[0]) {
+            if (localeScript[0] != o.localeScript[0] && requested->localeScript[0]) {
+                return localeScript[0];
+            }
+        }
+
+        if (localeVariant[0] || o.localeVariant[0]) {
+            if (localeVariant[0] != o.localeVariant[0] && requested->localeVariant[0]) {
+                return localeVariant[0];
+            }
+        }
+
         if (screenLayout || o.screenLayout) {
             if (((screenLayout^o.screenLayout) & MASK_LAYOUTDIR) != 0
                     && (requested->screenLayout & MASK_LAYOUTDIR)) {
@@ -2054,17 +2176,23 @@
         }
     }
     if (locale != 0) {
+        // Don't consider the script & variants when deciding matches.
+        //
+        // If we two configs differ only in their script or language, they
+        // can be weeded out in the isMoreSpecificThan test.
         if (language[0] != 0
             && (language[0] != settings.language[0]
                 || language[1] != settings.language[1])) {
             return false;
         }
+
         if (country[0] != 0
             && (country[0] != settings.country[0]
                 || country[1] != settings.country[1])) {
             return false;
         }
     }
+
     if (screenConfig != 0) {
         const int layoutDir = screenLayout&MASK_LAYOUTDIR;
         const int setLayoutDir = settings.screenLayout&MASK_LAYOUTDIR;
@@ -2166,16 +2294,42 @@
     return true;
 }
 
-void ResTable_config::getLocale(char str[6]) const {
-    memset(str, 0, 6);
+void ResTable_config::getLocale(char str[RESTABLE_MAX_LOCALE_LEN]) const {
+    memset(str, 0, RESTABLE_MAX_LOCALE_LEN);
+
+    // This represents the "any" locale value, which has traditionally been
+    // represented by the empty string.
+    if (!language[0] && !country[0]) {
+        return;
+    }
+
+    size_t charsWritten = 0;
     if (language[0]) {
-        str[0] = language[0];
-        str[1] = language[1];
-        if (country[0]) {
-            str[2] = '_';
-            str[3] = country[0];
-            str[4] = country[1];
+        unpackLanguage(str);
+    }
+
+    if (country[0]) {
+        if (charsWritten) {
+            str[charsWritten++] = '_';
+            str[charsWritten++] = 'r';
         }
+        charsWritten += unpackRegion(str + charsWritten);
+    }
+
+    if (localeScript[0]) {
+        if (charsWritten) {
+            str[charsWritten++] = '_';
+            str[charsWritten++] = '_s';
+        }
+        memcpy(str + charsWritten, localeScript, sizeof(localeScript));
+    }
+
+    if (localeVariant[0]) {
+        if (charsWritten) {
+            str[charsWritten++] = '_';
+            str[charsWritten++] = 'v';
+        }
+        memcpy(str + charsWritten, localeVariant, sizeof(localeVariant));
     }
 }
 
@@ -2190,14 +2344,10 @@
         if (res.size() > 0) res.append("-");
         res.appendFormat("%dmnc", dtohs(mnc));
     }
-    if (language[0] != 0) {
-        if (res.size() > 0) res.append("-");
-        res.append(language, 2);
-    }
-    if (country[0] != 0) {
-        if (res.size() > 0) res.append("-");
-        res.append(country, 2);
-    }
+    char localeStr[RESTABLE_MAX_LOCALE_LEN];
+    getLocale(localeStr);
+    res.append(localeStr);
+
     if ((screenLayout&MASK_LAYOUTDIR) != 0) {
         if (res.size() > 0) res.append("-");
         switch (screenLayout&ResTable_config::MASK_LAYOUTDIR) {
@@ -4976,8 +5126,9 @@
     getConfigurations(&configs);
     ALOGV("called getConfigurations size=%d", (int)configs.size());
     const size_t I = configs.size();
+
+    char locale[RESTABLE_MAX_LOCALE_LEN];
     for (size_t i=0; i<I; i++) {
-        char locale[6];
         configs[i].getLocale(locale);
         const size_t J = locales->size();
         size_t j;
@@ -5601,9 +5752,9 @@
         printf("mError=0x%x (%s)\n", mError, strerror(mError));
     }
 #if 0
-    printf("mParams=%c%c-%c%c,\n",
-            mParams.language[0], mParams.language[1],
-            mParams.country[0], mParams.country[1]);
+    char localeStr[RESTABLE_MAX_LOCALE_LEN];
+    mParams.getLocale(localeStr);
+    printf("mParams=%s,\n" localeStr);
 #endif
     size_t pgCount = mPackageGroups.size();
     printf("Package Groups (%d)\n", (int)pgCount);
@@ -5732,7 +5883,7 @@
                             continue;
                         }
                         
-                        uint16_t esize = dtohs(ent->size);
+                        uintptr_t esize = dtohs(ent->size);
                         if ((esize&0x3) != 0) {
                             printf("NON-INTEGER ResTable_entry SIZE: %p\n", (void*)esize);
                             continue;
diff --git a/libs/androidfw/tests/Android.mk b/libs/androidfw/tests/Android.mk
index 6e6522c..9e9649c 100644
--- a/libs/androidfw/tests/Android.mk
+++ b/libs/androidfw/tests/Android.mk
@@ -6,7 +6,8 @@
 test_src_files := \
     BackupData_test.cpp \
     ObbFile_test.cpp \
-    ZipUtils_test.cpp
+    ZipUtils_test.cpp \
+    ResourceTypes_test.cpp
 
 shared_libraries := \
     libandroidfw \
diff --git a/libs/androidfw/tests/ResourceTypes_test.cpp b/libs/androidfw/tests/ResourceTypes_test.cpp
new file mode 100644
index 0000000..eadfe00
--- /dev/null
+++ b/libs/androidfw/tests/ResourceTypes_test.cpp
@@ -0,0 +1,150 @@
+/*
+ * Copyright (C) 2014 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <androidfw/ResourceTypes.h>
+#include <utils/Log.h>
+#include <utils/String8.h>
+
+#include <gtest/gtest.h>
+namespace android {
+
+TEST(ResourceTypesTest, ResourceConfig_packAndUnpack2LetterLanguage) {
+     ResTable_config config;
+     config.packLanguage("en");
+
+     EXPECT_EQ('e', config.language[0]);
+     EXPECT_EQ('n', config.language[1]);
+
+     char out[4] = { 1, 1, 1, 1};
+     config.unpackLanguage(out);
+     EXPECT_EQ('e', out[0]);
+     EXPECT_EQ('n', out[1]);
+     EXPECT_EQ(0, out[2]);
+     EXPECT_EQ(0, out[3]);
+
+     memset(out, 1, sizeof(out));
+     config.locale = 0;
+     config.unpackLanguage(out);
+     EXPECT_EQ(0, out[0]);
+     EXPECT_EQ(0, out[1]);
+     EXPECT_EQ(0, out[2]);
+     EXPECT_EQ(0, out[3]);
+}
+
+TEST(ResourceTypesTest, ResourceConfig_packAndUnpack2LetterRegion) {
+     ResTable_config config;
+     config.packRegion("US");
+
+     EXPECT_EQ('U', config.country[0]);
+     EXPECT_EQ('S', config.country[1]);
+
+     char out[4] = { 1, 1, 1, 1};
+     config.unpackRegion(out);
+     EXPECT_EQ('U', out[0]);
+     EXPECT_EQ('S', out[1]);
+     EXPECT_EQ(0, out[2]);
+     EXPECT_EQ(0, out[3]);
+}
+
+TEST(ResourceTypesTest, ResourceConfig_packAndUnpack3LetterLanguage) {
+     ResTable_config config;
+     config.packLanguage("eng");
+
+     // 1-00110-01 101-00100
+     EXPECT_EQ(0x99, config.language[0]);
+     EXPECT_EQ(0xa4, config.language[1]);
+
+     char out[4] = { 1, 1, 1, 1};
+     config.unpackLanguage(out);
+     EXPECT_EQ('e', out[0]);
+     EXPECT_EQ('n', out[1]);
+     EXPECT_EQ('g', out[2]);
+     EXPECT_EQ(0, out[3]);
+}
+
+TEST(ResourceTypesTest, ResourceConfig_packAndUnpack3LetterRegion) {
+     ResTable_config config;
+     config.packRegion("419");
+
+     char out[4] = { 1, 1, 1, 1};
+     config.unpackRegion(out);
+
+     EXPECT_EQ('4', out[0]);
+     EXPECT_EQ('1', out[1]);
+     EXPECT_EQ('9', out[2]);
+}
+
+/* static */ void fillIn(const char* lang, const char* country,
+        const char* script, const char* variant, ResTable_config* out) {
+     memset(out, 0, sizeof(ResTable_config));
+     if (lang != NULL) {
+         out->packLanguage(lang);
+     }
+
+     if (country != NULL) {
+         out->packRegion(country);
+     }
+
+     if (script != NULL) {
+         memcpy(out->localeScript, script, 4);
+     }
+
+     if (variant != NULL) {
+         memcpy(out->localeVariant, variant, strlen(variant));
+     }
+}
+
+TEST(ResourceTypesTest, IsMoreSpecificThan) {
+    ResTable_config l;
+    ResTable_config r;
+
+    fillIn("en", NULL, NULL, NULL, &l);
+    fillIn(NULL, NULL, NULL, NULL, &r);
+
+    EXPECT_TRUE(l.isMoreSpecificThan(r));
+    EXPECT_FALSE(r.isMoreSpecificThan(l));
+
+    fillIn("eng", NULL, NULL, NULL, &l);
+    EXPECT_TRUE(l.isMoreSpecificThan(r));
+    EXPECT_FALSE(r.isMoreSpecificThan(l));
+
+    fillIn("eng", "419", NULL, NULL, &r);
+    EXPECT_FALSE(l.isMoreSpecificThan(r));
+    EXPECT_TRUE(r.isMoreSpecificThan(l));
+
+    fillIn("en", NULL, NULL, NULL, &l);
+    fillIn("en", "US", NULL, NULL, &r);
+    EXPECT_FALSE(l.isMoreSpecificThan(r));
+    EXPECT_TRUE(r.isMoreSpecificThan(l));
+
+    fillIn("en", "US", NULL, NULL, &l);
+    fillIn("en", "US", "Latn", NULL, &r);
+    EXPECT_FALSE(l.isMoreSpecificThan(r));
+    EXPECT_TRUE(r.isMoreSpecificThan(l));
+
+    fillIn("en", "US", NULL, NULL, &l);
+    fillIn("en", "US", NULL, "POSIX", &r);
+    EXPECT_FALSE(l.isMoreSpecificThan(r));
+    EXPECT_TRUE(r.isMoreSpecificThan(l));
+
+    fillIn("en", "US", "Latn", NULL, &l);
+    fillIn("en", "US", NULL, "POSIX", &r);
+    EXPECT_FALSE(l.isMoreSpecificThan(r));
+    EXPECT_TRUE(r.isMoreSpecificThan(l));
+}
+
+
+}  // namespace android.