Repository: netty/netty
File: codec-http/src/main/java/io/netty/handler/codec/http/HttpUtil.java (Java)

Code before:
     * @throws NullPointerException in case if {@code contentTypeValue == null}
     */
    public static CharSequence getMimeType(CharSequence contentTypeValue) {
        ObjectUtil.checkNotNull(contentTypeValue, "contentTypeValue");

        int indexOfSemicolon = AsciiString.indexOfIgnoreCaseAscii(contentTypeValue, SEMICOLON, 0);
        if (indexOfSemicolon != AsciiString.INDEX_NOT_FOUND) {
            return contentTypeValue.subSequence(0, indexOfSemicolon);
        } else {
            return contentTypeValue.length() > 0 ? contentTypeValue : null;
        }
    }

    /**
     * Formats the host string of an address so it can be used for computing an HTTP component
     * such as a URL or a Host header
     *
     * @param addr the address
     * @return the formatted String
     */
    public static String formatHostnameForHttp(InetSocketAddress addr) {
        String hostString = NetUtil.getHostname(addr);
        if (NetUtil.isValidIpV6Address(hostString)) {
            if (!addr.isUnresolved()) {
                hostString = NetUtil.toAddressString(addr.getAddress());
            } else  if (hostString.charAt(0) == '[' && hostString.charAt(hostString.length() - 1) == ']') {
                // If IPv6 address already contains brackets, let's return as is.
                return hostString;
            }
            }

            return '[' + hostString + ']';
        }
        return hostString;
    }

    /**
     * Validates, and optionally extracts the content length from headers. This method is not intended for
     * general use, but is here to be shared between HTTP/1 and HTTP/2 parsing.
     *
     * @param contentLengthFields the content-length header fields.
     * @param isHttp10OrEarlier {@code true} if we are handling HTTP/1.0 or earlier
     * @param allowDuplicateContentLengths {@code true}  if multiple, identical-value content lengths should be allowed.
     * @return the normalized content length from the headers or {@code -1} if the fields were empty.
     * @throws IllegalArgumentException if the content-length fields are not valid
     */
    public static long normalizeAndGetContentLength(
            List<? extends CharSequence> contentLengthFields, boolean isHttp10OrEarlier,
            boolean allowDuplicateContentLengths) {
        if (contentLengthFields.isEmpty()) {
            return -1;

Review comment (suggestion):
```suggestion
            } else if (hostString.charAt(0) == '[' && hostString.charAt(hostString.length() - 1) == ']') {
```

Code after:
     * @throws NullPointerException in case if {@code contentTypeValue == null}
     */
    public static CharSequence getMimeType(CharSequence contentTypeValue) {
        ObjectUtil.checkNotNull(contentTypeValue, "contentTypeValue");

        int indexOfSemicolon = AsciiString.indexOfIgnoreCaseAscii(contentTypeValue, SEMICOLON, 0);
        if (indexOfSemicolon != AsciiString.INDEX_NOT_FOUND) {
            return contentTypeValue.subSequence(0, indexOfSemicolon);
        } else {
            return contentTypeValue.length() > 0 ? contentTypeValue : null;
        }
    }

    /**
     * Formats the host string of an address so it can be used for computing an HTTP component
     * such as a URL or a Host header
     *
     * @param addr the address
     * @return the formatted String
     */
    public static String formatHostnameForHttp(InetSocketAddress addr) {
        String hostString = NetUtil.getHostname(addr);
        if (NetUtil.isValidIpV6Address(hostString)) {
            if (!addr.isUnresolved()) {
                hostString = NetUtil.toAddressString(addr.getAddress());
            } else if (hostString.charAt(0) == '[' && hostString.charAt(hostString.length() - 1) == ']') {
                // If IPv6 address already contains brackets, let's return as is.
                return hostString;
            }

            return '[' + hostString + ']';
        }
        return hostString;
    }

    /**
     * Validates, and optionally extracts the content length from headers. This method is not intended for
     * general use, but is here to be shared between HTTP/1 and HTTP/2 parsing.
     *
     * @param contentLengthFields the content-length header fields.
     * @param isHttp10OrEarlier {@code true} if we are handling HTTP/1.0 or earlier
     * @param allowDuplicateContentLengths {@code true}  if multiple, identical-value content lengths should be allowed.
     * @return the normalized content length from the headers or {@code -1} if the fields were empty.
     * @throws IllegalArgumentException if the content-length fields are not valid
     */
    public static long normalizeAndGetContentLength(
            List<? extends CharSequence> contentLengthFields, boolean isHttp10OrEarlier,
            boolean allowDuplicateContentLengths) {
        if (contentLengthFields.isEmpty()) {
            return -1;
        }