kerby-common/kerby-xdr/src/main/java/org/apache/kerby/xdr/type/XdrString.java [182:221]:
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    public static void toUTF8ByteArray(char[] string, OutputStream sOut) throws IOException {
        char[] c = string;
        int i = 0;

        while (i < c.length) {
            char ch = c[i];

            if (ch < 0x0080) {
                sOut.write(ch);
            } else if (ch < 0x0800) {
                sOut.write(0xc0 | (ch >> 6));
                sOut.write(0x80 | (ch & 0x3f));
            } else if (ch >= 0xD800 && ch <= 0xDFFF) {
                // in error - can only happen, if the Java String class has a
                // bug.
                if (i + 1 >= c.length) {
                    throw new IllegalStateException("invalid UTF-16 codepoint");
                }
                char w1 = ch;
                ch = c[++i];
                char w2 = ch;
                // in error - can only happen, if the Java String class has a
                // bug.
                if (w1 > 0xDBFF) {
                    throw new IllegalStateException("invalid UTF-16 codepoint");
                }
                int codePoint = ((w1 & 0x03FF) << 10) | (w2 & 0x03FF) + 0x10000;
                sOut.write(0xf0 | (codePoint >> 18));
                sOut.write(0x80 | ((codePoint >> 12) & 0x3F));
                sOut.write(0x80 | ((codePoint >> 6) & 0x3F));
                sOut.write(0x80 | (codePoint & 0x3F));
            } else {
                sOut.write(0xe0 | (ch >> 12));
                sOut.write(0x80 | ((ch >> 6) & 0x3F));
                sOut.write(0x80 | (ch & 0x3F));
            }

            i++;
        }
    }
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kerby-common/kerby-asn1/src/main/java/org/apache/kerby/asn1/type/Asn1String.java [133:172]:
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    public static void toUTF8ByteArray(char[] string, OutputStream sOut) throws IOException {
        char[] c = string;
        int i = 0;

        while (i < c.length) {
            char ch = c[i];

            if (ch < 0x0080) {
                sOut.write(ch);
            } else if (ch < 0x0800) {
                sOut.write(0xc0 | (ch >> 6));
                sOut.write(0x80 | (ch & 0x3f));
            } else if (ch >= 0xD800 && ch <= 0xDFFF) {
                // in error - can only happen, if the Java String class has a
                // bug.
                if (i + 1 >= c.length) {
                    throw new IllegalStateException("invalid UTF-16 codepoint");
                }
                char w1 = ch;
                ch = c[++i];
                char w2 = ch;
                // in error - can only happen, if the Java String class has a
                // bug.
                if (w1 > 0xDBFF) {
                    throw new IllegalStateException("invalid UTF-16 codepoint");
                }
                int codePoint = ((w1 & 0x03FF) << 10) | (w2 & 0x03FF) + 0x10000;
                sOut.write(0xf0 | (codePoint >> 18));
                sOut.write(0x80 | ((codePoint >> 12) & 0x3F));
                sOut.write(0x80 | ((codePoint >> 6) & 0x3F));
                sOut.write(0x80 | (codePoint & 0x3F));
            } else {
                sOut.write(0xe0 | (ch >> 12));
                sOut.write(0x80 | ((ch >> 6) & 0x3F));
                sOut.write(0x80 | (ch & 0x3F));
            }

            i++;
        }
    }
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