Add the missing sr-Latn into png files and rename the png locale header

Switch the locale header in the png files from Locale.toString() to
Locale.toLanguageTag(). For example, en_US --> en-us and sr__#Latn
--> sr-Latn. Also clean up recovery a bit to expect the new locale
format.

Bug: 35215015
Test: sr-Latn shows correctly under graphic tests && recovery tests pass
Change-Id: Ic62bab7756cdc6e5f98f26076f7c2dd046f811db

minui/Android.mk

@@ -28,7 +28,10 @@ LOCAL_WHOLE_STATIC_LIBRARIES := \
     libdrm \
     libsync_recovery
 
-LOCAL_STATIC_LIBRARIES := libpng
+LOCAL_STATIC_LIBRARIES := \
+    libpng \
+    libbase
+
 LOCAL_CFLAGS := -Werror
 LOCAL_C_INCLUDES := $(LOCAL_PATH)/include
 LOCAL_EXPORT_C_INCLUDE_DIRS := $(LOCAL_PATH)/include
@@ -61,7 +64,10 @@ include $(BUILD_STATIC_LIBRARY)
 include $(CLEAR_VARS)
 LOCAL_MODULE := libminui
 LOCAL_WHOLE_STATIC_LIBRARIES += libminui
-LOCAL_SHARED_LIBRARIES := libpng
+LOCAL_SHARED_LIBRARIES := \
+    libpng \
+    libbase
+
 LOCAL_CFLAGS := -Werror
 LOCAL_C_INCLUDES := $(LOCAL_PATH)/include
 LOCAL_EXPORT_C_INCLUDE_DIRS := $(LOCAL_PATH)/include

minui/include/minui/minui.h

@@ -20,6 +20,7 @@
 #include <sys/types.h>
 
 #include <functional>
+#include <string>
 
 //
 // Graphics.
@@ -93,7 +94,7 @@ int ev_get_epollfd();
 // Resources
 //
 
-bool matches_locale(const char* prefix, const char* locale);
+bool matches_locale(const std::string& prefix, const std::string& locale);
 
 // res_create_*_surface() functions return 0 if no error, else
 // negative.

minui/resources.cpp

@@ -25,8 +25,11 @@
 #include <sys/types.h>
 #include <unistd.h>
 
+#include <regex>
+#include <string>
 #include <vector>
 
+#include <android-base/strings.h>
 #include <png.h>
 
 #include "minui/minui.h"
@@ -371,16 +374,26 @@ int res_create_alpha_surface(const char* name, GRSurface** pSurface) {
 
 // This function tests if a locale string stored in PNG (prefix) matches
 // the locale string provided by the system (locale).
-bool matches_locale(const char* prefix, const char* locale) {
-    if (locale == nullptr) {
-        return false;
+bool matches_locale(const std::string& prefix, const std::string& locale) {
+  // According to the BCP 47 format, A locale string may consists of:
+  // language-{extlang}-{script}-{region}-{variant}
+  // The locale headers in PNG mostly consist of language-{region} except for sr-Latn, and some
+  // android's system locale can have the format language-{script}-{region}.
+
+  // Return true if the whole string of prefix matches the top part of locale. Otherwise try to
+  // match the locale string without the {script} section.
+  // For instance, prefix == "en" matches locale == "en-US", prefix == "sr-Latn" matches locale
+  // == "sr-Latn-BA", and prefix == "zh-CN" matches locale == "zh-Hans-CN".
+  if (android::base::StartsWith(locale, prefix.c_str())) {
+    return true;
   }
 
-    // Return true if the whole string of prefix matches the top part of
-    // locale. For instance, prefix == "en" matches locale == "en_US";
-    // and prefix == "zh_CN" matches locale == "zh_CN_#Hans".
-
-    return (strncmp(prefix, locale, strlen(prefix)) == 0);
+  size_t separator = prefix.find('-');
+  if (separator == std::string::npos) {
+    return false;
+  }
+  std::regex loc_regex(prefix.substr(0, separator) + "-[A-Za-z]*" + prefix.substr(separator));
+  return std::regex_match(locale, loc_regex);
 }
 
 int res_create_localized_alpha_surface(const char* name,

recovery.cpp

@@ -122,7 +122,7 @@ static const int BATTERY_READ_TIMEOUT_IN_SEC = 10;
 static const int BATTERY_OK_PERCENTAGE = 20;
 static const int BATTERY_WITH_CHARGER_OK_PERCENTAGE = 15;
 static constexpr const char* RECOVERY_WIPE = "/etc/recovery.wipe";
-static constexpr const char* DEFAULT_LOCALE = "en_US";
+static constexpr const char* DEFAULT_LOCALE = "en-US";
 
 static std::string locale;
 static bool has_cache = false;

tests/unit/locale_test.cpp

@@ -19,14 +19,15 @@
 #include "minui/minui.h"
 
 TEST(LocaleTest, Misc) {
-    EXPECT_TRUE(matches_locale("zh_CN", "zh_CN_#Hans"));
-    EXPECT_TRUE(matches_locale("zh", "zh_CN_#Hans"));
-    EXPECT_FALSE(matches_locale("zh_HK", "zh_CN_#Hans"));
-    EXPECT_TRUE(matches_locale("en_GB", "en_GB"));
-    EXPECT_TRUE(matches_locale("en", "en_GB"));
-    EXPECT_FALSE(matches_locale("en_GB", "en"));
-    EXPECT_FALSE(matches_locale("en_GB", "en_US"));
-    EXPECT_FALSE(matches_locale("en_US", ""));
+  EXPECT_TRUE(matches_locale("zh-CN", "zh-Hans-CN"));
+  EXPECT_TRUE(matches_locale("zh", "zh-Hans-CN"));
+  EXPECT_FALSE(matches_locale("zh-HK", "zh-Hans-CN"));
+  EXPECT_TRUE(matches_locale("en-GB", "en-GB"));
+  EXPECT_TRUE(matches_locale("en", "en-GB"));
+  EXPECT_FALSE(matches_locale("en-GB", "en"));
+  EXPECT_FALSE(matches_locale("en-GB", "en-US"));
+  EXPECT_FALSE(matches_locale("en-US", ""));
   // Empty locale prefix in the PNG file will match the input locale.
-    EXPECT_TRUE(matches_locale("", "en_US"));
+  EXPECT_TRUE(matches_locale("", "en-US"));
+  EXPECT_TRUE(matches_locale("sr-Latn", "sr-Latn-BA"));
 }