Method arraycopy

src/java/org/apache/poi/util/ArrayUtil.java:32–48

This is really a debugging version of System.arraycopy() . Use it to provide better exception messages when copying arrays around. For production use it's better to use the original for speed.

(byte[] src, int src_position, byte[] dst, int dst_position, int length)

     * For production use it's better to use the original for speed.
     */
    public static void arraycopy(byte[] src, int src_position, byte[] dst, int dst_position, int length)
    {
        if (src_position < 0)
            throw new IllegalArgumentException("src_position was less than 0.  Actual value " + src_position);
        if (src_position >= src.length)
            throw new IllegalArgumentException( "src_position was greater than src array size.  Tried to write starting at position " + src_position + " but the array length is " + src.length );
        if (src_position + length > src.length)
            throw new IllegalArgumentException("src_position + length would overrun the src array.  Expected end at " + (src_position + length) + " actual end at " + src.length);
        if (dst_position < 0)
            throw new IllegalArgumentException("dst_position was less than 0.  Actual value " + dst_position);
        if (dst_position >= dst.length)
            throw new IllegalArgumentException( "dst_position was greater than dst array size.  Tried to write starting at position " + dst_position + " but the array length is " + dst.length );
        if (dst_position + length > dst.length)
            throw new IllegalArgumentException("dst_position + length would overrun the dst array.  Expected end at " + (dst_position + length) + " actual end at " + dst.length);

        System.arraycopy( src, src_position, dst, dst_position, length);
    }

    /**
     * Moves a number of entries in an array to another point in the array,