public static void decode()

in commons-vfs2/src/main/java/org/apache/commons/vfs2/provider/UriParser.java [159:195]

32 lines of code
9 McCabe index (conditional complexity)


    public static void decode(final StringBuilder buffer, final int offset, final int length)
            throws FileSystemException {
        int index = offset;
        int count = length;
        boolean ipv6Host = false;
        for (; count > 0; count--, index++) {
            final char ch = buffer.charAt(index);
            if (ch == '[') {
                ipv6Host = true;
            }
            if (ch == ']') {
                ipv6Host = false;
            }
            if (ch != '%' || ipv6Host) {
                continue;
            }

            if (count < 3) {
                throw new FileSystemException("vfs.provider/invalid-escape-sequence.error",
                        buffer.substring(index, index + count));
            }

            // Decode
            final int dig1 = Character.digit(buffer.charAt(index + 1), HEX_BASE);
            final int dig2 = Character.digit(buffer.charAt(index + 2), HEX_BASE);
            if (dig1 == -1 || dig2 == -1) {
                throw new FileSystemException("vfs.provider/invalid-escape-sequence.error",
                        buffer.substring(index, index + 3));
            }
            final char value = (char) (dig1 << BITS_IN_HALF_BYTE | dig2);

            // Replace
            buffer.setCharAt(index, value);
            buffer.delete(index + 1, index + 3);
            count -= 2;
        }
    }