Cleanup

app/src/main/java/eu/faircode/email/CharsetHelper.java

@@ -21,7 +21,6 @@ package eu.faircode.email;
 
 import java.nio.charset.Charset;
 import java.nio.charset.StandardCharsets;
-import java.nio.charset.UnsupportedCharsetException;
 
 class CharsetHelper {
     private static final int MAX_SAMPLE_SIZE = 8192;
@@ -64,66 +63,6 @@ class CharsetHelper {
         return true;
     }
 
-    static boolean isISO8859(String text) {
-        // https://en.wikipedia.org/wiki/ISO/IEC_8859-1
-        int c;
-        byte[] octets = text.getBytes(StandardCharsets.ISO_8859_1);
-        for (byte b : octets) {
-            c = b & 0xFF;
-            if (c < 32)
-                return false;
-            if (c >= 127 && c < 160)
-                return false;
-        }
-        return true;
-    }
-
-    static boolean isISO2022JP(String text) {
-        // https://en.wikipedia.org/wiki/ISO/IEC_2022
-        // https://www.sljfaq.org/afaq/encodings.html#encodings-ISO-2022-JP
-
-        try {
-            Charset.forName("ISO-2022-JP");
-        } catch (UnsupportedCharsetException ex) {
-            return false;
-        }
-
-        int c;
-        int escapes = 0;
-        boolean escaped = false;
-        boolean parenthesis = false;
-        boolean dollar = false;
-        byte[] octets = text.getBytes(StandardCharsets.ISO_8859_1);
-        for (byte b : octets) {
-            c = b & 0xFF;
-
-            if (c > 0x7F)
-                return false;
-
-            if (escaped) {
-                escaped = false;
-                if (c == '(')
-                    parenthesis = true;
-                else if (c == '$')
-                    dollar = true;
-            } else if (parenthesis) {
-                parenthesis = false;
-                if (c == 'B' || c == 'J')
-                    escapes++;
-            } else if (dollar) {
-                dollar = false;
-                if (c == '@' || c == 'B')
-                    escapes++;
-            } else if (c == 0x1B)
-                escaped = true;
-
-            if (escapes >= 3)
-                return true;
-        }
-
-        return false;
-    }
-
     static Charset detect(String text) {
         try {
             byte[] octets = text.getBytes(StandardCharsets.ISO_8859_1);