Method getRealIndex

java/org/apache/coyote/http2/HpackDecoder.java:302–312

because we use a ring buffer type construct, and don't actually shuffle items in the array, we need to figure out the real index to use. package private for unit tests @param index The index from the hpack @return the real index into the array

(int index)

     * @return the real index into the array
     */
    int getRealIndex(int index) throws HpackException {
        int dynamicIndex = index - Hpack.STATIC_TABLE_LENGTH;
        // The index is one based, but our table is zero based
        // Also, because of our ring buffer set up, the indexes are reversed
        // index = 1 is at position firstSlotPosition + filledSlots
        if (dynamicIndex < 1 || dynamicIndex > filledTableSlots) {
            throw new HpackException(sm.getString("hpackdecoder.headerTableIndexInvalid", Integer.valueOf(index),
                    Integer.valueOf(Hpack.STATIC_TABLE_LENGTH), Integer.valueOf(filledTableSlots)));
        }
        return (firstSlotPosition + (filledTableSlots - dynamicIndex)) % headerTable.length;
    }

    private void addStaticTableEntry(int index) throws HpackException {
        // adds an entry from the static table.