Implement Kitty graphics protocol as a follow-up to #2973, not a replacement for Sixel

terminal-emulator/src/main/java/com/termux/terminal/AndroidUtils.java

@@ -0,0 +1,65 @@
+package com.termux.terminal;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.util.Properties;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+public class AndroidUtils {
+
+    /**
+     * Get system properties as {@link Properties} from `/system/bin/getprop` command output
+     * that reads the `/system/build.prop` file.
+     *
+     * Sourced from https://github.com/termux/termux-app/blob/30ebb2dee381d292ade0f2868cfde0f9f20b89fe/termux-shared/src/main/java/com/termux/shared/android/AndroidUtils.java#L170.
+     */
+    public static Properties getSystemProperties(String logTag) {
+        Properties systemProperties = new Properties();
+
+        // getprop commands returns values in the format `[key]: [value]`
+        // Regex matches string starting with a literal `[`,
+        // followed by one or more characters that do not match a closing square bracket as the key,
+        // followed by a literal `]: [`,
+        // followed by one or more characters as the value,
+        // followed by string ending with literal `]`
+        // multiline values will be ignored
+        Pattern propertiesPattern = Pattern.compile("^\\[([^]]+)]: \\[(.+)]$");
+
+        try {
+            Process process = new ProcessBuilder()
+                .command("/system/bin/getprop")
+                .redirectErrorStream(true)
+                .start();
+
+            InputStream inputStream = process.getInputStream();
+            BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
+            String line, key, value;
+
+            while ((line = bufferedReader.readLine()) != null) {
+                Matcher matcher = propertiesPattern.matcher(line);
+                if (matcher.matches()) {
+                    key = matcher.group(1);
+                    value = matcher.group(2);
+                    if (key != null && value != null && !key.isEmpty() && !value.isEmpty())
+                        systemProperties.put(key, value);
+                }
+            }
+
+            bufferedReader.close();
+            process.destroy();
+
+        } catch (IOException e) {
+            Logger.logStackTraceWithMessage(null, logTag, "Failed to get run \"/system/bin/getprop\" to get system properties.", e);
+        }
+
+        //for (String key : systemProperties.stringPropertyNames()) {
+        //    Logger.logVerbose(null, logTag, key + ": " +  systemProperties.get(key));
+        //}
+
+        return systemProperties;
+    }
+
+}