Method readFully

src/main/java/org/apache/commons/io/IOUtils.java:2973–2979

Reads the requested number of characters or fail if there are not enough left. This allows for the possibility that Reader#read(char[], int, int) may not read as many characters as requested (most likely because of reaching EOF). @param input where to read input from @param buffer desti

(final Reader input, final char[] buffer, final int offset, final int length)

     * @since 2.2
     */
    public static void readFully(final Reader input, final char[] buffer, final int offset, final int length)
            throws IOException {
        final int actual = read(input, buffer, offset, length);
        if (actual != length) {
            throw new EOFException("Length to read: " + length + " actual: " + actual);
        }
    }

    /**
     * Reads the requested number of characters or fail if there are not enough left.