/* packet-ouch.c

 * Routines for OUCH 4.x protocol dissection

 * Copyright (C) 2013, 2015, 2016 David Arnold <d@0x1.org>

 *

 * Wireshark - Network traffic analyzer

 * By Gerald Combs <gerald@wireshark.org>

 * Copyright 1998 Gerald Combs

 *

 * SPDX-License-Identifier: GPL-2.0-or-later

 */

/* OUCH is a stock exchange order entry protocol published and used by

 * NASDAQ.  This dissector supports versions 4.x, which differ from

 * earlier versions by adopting binary encoding for numeric values.

 *

 * OUCH is usually encapsulated within NASDAQ's SoupBinTCP protocol,

 * running over a TCP connection from the trading application to the

 * exchange.  SOUP provides framing, heartbeats and authentication;

 * consequently none of these is present in OUCH.

 *

 * Other exchanges have created order entry protocols very similar to

 * OUCH, but typically they differ in subtle ways (and continue to

 * diverge as time progresses) so I have not attempted to dissect

 * anything other than proper NASDAQ OUCH in this code.

 *

 * Specifications are available from NASDAQ's website, although the

 * links to find them tend to move around over time.  At the time of

 * writing, the correct URL is:

 *

 * http://www.nasdaqtrader.com/content/technicalsupport/specifications/TradingProducts/OUCH4.2.pdf

 */

#include "config.h"

#include <epan/packet.h>

void proto_register_ouch(void);

void proto_reg_handoff_ouch(void);

static const value_string pkt_type_val[] = {

    { 'O', "Enter Order" },

    { 'U', "Replace Order" },

    { 'X', "Cancel Order" },

    { 'M', "Modify Order" },

    { 'S', "System Event" },

    { 'A', "Accepted" },

    { 'R', "Replaced" }, /* 'U' on the wire, but use 'R' to disambiguate */

    { 'C', "Canceled" },

    { 'D', "AIQ Canceled" },

    { 'E', "Executed" },

    { 'F', "Trade Correction" },

    { 'G', "Executed with Reference Price" },

    { 'B', "Broken Trade" },

    { 'K', "Price Correction" },

    { 'J', "Rejected" },

    { 'P', "Cancel Pending" },

    { 'I', "Cancel Reject" },

    { 'T', "Order Priority Update" },

    { 'm', "Order Modified" }, /* 'M' on the wire; 'm' to disambiguate */

    { 0, NULL }

};

static const value_string ouch_bbo_weight_indicator_val[] = {

    { '0', "0 - 0.2%" },

    { '1', "0.2 - 1%" },

    { '2', "1 - 2%" },

    { '3', "Greater than 2%" },

    { ' ', "Unspecified" },

    { 'S', "Sets the QBBO while joining the NBBO" },

    { 'N', "Improves the NBBO upon entry" },

    { 0, NULL }

};

static const value_string ouch_broken_trade_reason_val[] = {

    { 'E', "Erroneous" },

    { 'C', "Consent" },

    { 'S', "Supervisory" },

    { 'X', "External" },

    { 0, NULL }

};

static const value_string ouch_buy_sell_indicator_val[] = {

    { 'B', "Buy Order" },

    { 'S', "Sell Order" },

    { 'T', "Sell Short" },

    { 'E', "Sell Short Exempt" },

    { 0, NULL }

};

static const value_string ouch_cancel_reason_val[] = {

    { 'C', "Cross cancel" },

    { 'D', "Regulatory restriction" },

    { 'E', "Closed" },

    { 'H', "Halted" },

    { 'I', "Immediate or Cancel order" },

    { 'K', "Market Collars" },

    { 'Q', "Self-match prevention" },

    { 'S', "Supervisory" },

    { 'T', "Timeout" },

    { 'U', "User requested cancel" },

    { 'X', "Open Protection" },

    { 'Z', "System cancel" },

    { 0, NULL }

};

static const value_string ouch_capacity_val[] = {

    { 'A', "Agency" },

    { 'O', "Other" },

    { 'P', "Principal" },

    { 'R', "Riskless" },

    { 0, NULL }

};

static const value_string ouch_cross_type_val[] = {

    { 'N', "No Cross" },

    { 'O', "Opening Cross" },

    { 'C', "Closing Cross" },

    { 'I', "Intra-day Cross" }, /* Seems to have been removed */

    { 'H', "Halt/IPO Cross" },

    { 'R', "Retail" }, /* Not in 4.0 */

    { 'S', "Supplemental Order" },

    { 0, NULL }

};

/* Not in 4.0 */

static const value_string ouch_customer_type_val[] = {

    { 'R', "Retail designated order" },

    { 'N', "Not a retail designated order" },

    { ' ', "Default configured for port" },

    { 0, NULL }

};

static const value_string ouch_display_val[] = {

    { 'A', "Attributable-Price to Display" },

    { 'I', "Imbalance-Only" },

    { 'L', "Post-Only and Attributable - Price to Display" },

    { 'M', "Mid-Point Peg" },

    { 'N', "Non-Display" },

    { 'O', "Retail Order Type 1" }, /* Not in 4.0 */

    { 'P', "Post-Only" },

    { 'Q', "Retail Price Improvement Order" }, /* Not in 4.0 */

    { 'R', "Round-Lot Only" }, /* Seems to have been removed? */

    { 'T', "Retail Order Type 2" }, /* Not in 4.0 */

    { 'W', "Mid-point Peg Post Only" },

    { 'Y', "Anonymous-Price to Comply" },

    { 'Z', "Entered as displayed bu changed to non-displayed "

           "(Priced to comply)" }, /* New in 4.2 */

    { 0, NULL}

};

static const value_string ouch_event_code_val[] = {

    { 'S', "Start of Day" },

    { 'E', "End of Day" },

    { 0, NULL}

};

static const value_string ouch_iso_eligibility_val[] = {

    { 'Y', "Eligible" },

    { 'N', "Not eligible" },

    { 0, NULL }

};

static const value_string ouch_liquidity_flag_val[] = {

    { '0', "Supplemental Order Execution" },

    { '4', "Added displayed liquidity in a Group A Symbol" },

    { '5', "Added non-displayed liquidity in a Group A Symbol" },

    { '6', "Removed liquidity in a Group A Symbol" },

    { '7', "Displayed, liquidity-adding order improves the NBBO" },

    { '8', "Displayed, liquidity-adding order sets the QBBO while joining the NBBO" },

    { 'A', "Added" },

    { 'C', "Closing Cross" },

    { 'H', "Halt/IPO Cross" },

    { 'I', "Intraday/Post-Market Cross" }, /* Seems to have been removed */

    { 'J', "Non-displayed adding liquidity" },

    { 'K', "Halt Cross" },

    { 'L', "Closing Cross (imbalance-only)" },

    { 'M', "Opening Cross (imbalance-only)" },

    { 'N', "Halt Cross, orders entered in pilot symbols during the LULD Trading Pause" },

    { 'O', "Opening Cross" },

    { 'R', "Removed" },

    { 'W', "Added post-only" }, /* Removed 4.2 2013/02/05 */

    { 'a', "Added displayed liquidity in a SCIP Symbol" },

    { 'b', "Displayed, liquidity-adding order improves the NBBO in pilot symbol during specified LULD Pricing Pilot timeframe" },

    { 'c', "Added displayed liquidity in a pilot symbol during specified LULD Pricing Pilot timeframe" },

    { 'd', "Retail designated execution that removed liquidity" },

    { 'e', "Retail designated execution that added displayed liquidity" },

    { 'f', "Retail designated execution that added non-displayed liquidity" },

    { 'g', "Added non-displayed mid-point liquidity in a Group A Symbol" },

    { 'h', "Removed liquidity in a pilot symbol during specified LULD Pricing Pilot timeframe" },

    { 'j', "RPI (Retail Price Improving) order provides liquidity" },

    { 'k', "Added liquidity via a midpoint order" },

    { 'm', "Removed liquidity at a midpoint" },

    { 'r', "Retail Order removes RPI liquidity" },

    { 't', "Retail Order removes price improving non-displayed liquidity other than RPI liquidity" },

    { 'x', "Displayed, liquidity-adding order improves the NBBO in a SCIP Symbol" },

    { 'y', "Displayed, liquidity-adding order set the QBBO while joining the NBBO in a SCIP Symbol" },

    { 0, NULL }

};

static const value_string ouch_order_state_val[] = {

    { 'L', "Order Live" },

    { 'D', "Order Dead" },

    { 0, NULL }

};

static const value_string ouch_price_correction_reason_val[] = {

    { 'E', "Erroneous" },

    { 'C', "Consent" },

    { 'S', "Supervisory" },

    { 'X', "External" },

    { 0, NULL }

};

static const value_string ouch_reference_price_type_val[] = {

    { 'I', "Intraday Indicative Value" },

    { 0, NULL }

};

static const value_string ouch_reject_reason_val[] = {

    { 'T', "Test Mode" },

    { 'H', "Halted" },

    { 'Z', "Shares exceeds configured safety threshold" },

    { 'S', "Invalid Stock" },

    { 'D', "Invalid Display Type" },

    { 'C', "NASDAQ is Closed" },

    { 'L', "Requested firm not authorized for requested clearing "

           "type on this account" },

    { 'M', "Outside of permitted times for requested clearing type" },

    { 'R', "This order is not allowed in this type of cross" },

    { 'X', "Invalid Price" },

    { 'N', "Invalid Minimum Quantity" },

    { 'O', "Other" },

    { 'W', "Invalid Mid-point Post Only Price" },

    { 'a', "Reject All enabled" },

    { 'b', "Easy to Borrow (ETB) reject" },

    { 'c', "Restricted symbol list reject" },

    { 'd', "ISO order restriction" },

    { 'e', "Odd lot order restriction" },

    { 'f', "Mid-Point order restriction" },

    { 'g', "Pre-market order restriction" },

    { 'h', "Post-market order restriction" },

    { 'i', "Short sale order restriction" },

    { 'j', "On Open order restriction" },

    { 'k', "On Close order restriction" },

    { 'l', "Two sided quote reject" },

    { 'm', "Exceeded shares limit" },

    { 'n', "Exceeded dollar value limit" },

    { 0, NULL}

};

static const value_string ouch_trade_correction_reason_val[] = {

    { 'N', "Adjusted to NAV" },

    { 0, NULL }

};

/* Initialize the protocol and registered fields */

static int proto_ouch;

static dissector_handle_t ouch_handle;

/* Initialize the subtree pointers */

static int ett_ouch;

static int hf_ouch_bbo_weight_indicator;

static int hf_ouch_broken_trade_reason;

static int hf_ouch_buy_sell_indicator;

static int hf_ouch_cancel_reason;

static int hf_ouch_capacity;

static int hf_ouch_cross_type;

static int hf_ouch_customer_type;

static int hf_ouch_decrement_shares;

static int hf_ouch_display;

static int hf_ouch_event_code;

static int hf_ouch_executed_shares;

static int hf_ouch_execution_price;

static int hf_ouch_existing_order_token;

static int hf_ouch_firm;

static int hf_ouch_iso_eligible;

static int hf_ouch_liquidity_flag;

static int hf_ouch_match_number;

static int hf_ouch_message;

static int hf_ouch_min_quantity;

static int hf_ouch_new_execution_price;

static int hf_ouch_order_reference_number;

static int hf_ouch_order_state;

static int hf_ouch_order_token;

static int hf_ouch_packet_type;

static int hf_ouch_previous_order_token;

static int hf_ouch_price;

static int hf_ouch_price_correction_reason;

static int hf_ouch_quantity_prevented_from_trading;

static int hf_ouch_reference_price;

static int hf_ouch_reference_price_type;

static int hf_ouch_reject_reason;

static int hf_ouch_replacement_order_token;

static int hf_ouch_shares;

static int hf_ouch_stock;

static int hf_ouch_tif;

static int hf_ouch_timestamp;

static int hf_ouch_trade_correction_reason;

/** Format an OUCH timestamp into a useful string

 *

 * We use this function rather than a BASE_CUSTOM formatter because

 * BASE_CUSTOM doesn't support passing a 64-bit value to the

 * formatting function. */

static void

ouch_tree_add_timestamp(

    packet_info *pinfo,

    proto_tree *tree,

    const int hf,

    tvbuff_t *tvb,

    int offset)

{

    uint64_t ts = tvb_get_ntoh64(tvb, offset);

    char *buf = (char *)wmem_alloc(pinfo->pool, ITEM_LABEL_LENGTH);

    uint32_t tmp, hours, mins, secs, nsecs;

    nsecs = (uint32_t)(ts % UINT64_C(1000000000));

    tmp = (uint32_t)(ts / UINT64_C(1000000000));

    hours = tmp / 3600;

    mins = (tmp % 3600) / 60;

    secs = tmp % 60;

    snprintf(buf, ITEM_LABEL_LENGTH,

               "%u:%02u:%02u.%09u",

               hours, mins, secs, nsecs);

    proto_tree_add_string(tree, hf, tvb, offset, 8, buf);

}

/** BASE_CUSTOM formatter for prices

 *

 * OUCH prices are integers, with four implicit decimal places.  So we

 * insert the decimal point, and add a leading dollar sign as well. */

static void

format_price(

    char *buf,

    uint32_t value)

{

    if (value == 0x7fffffff) {

        snprintf(buf, ITEM_LABEL_LENGTH, "%s", "Market");

    } else {

        snprintf(buf, ITEM_LABEL_LENGTH,

                   "$%u.%04u",

                   value / 10000, value % 10000);

    }

}

/** BASE_CUSTOM formatter for reference price type code

 *

 * Displays the code value as a character, not its ASCII value, as

 * would be done by BASE_DEC and friends. */

static void

format_reference_price_type(

    char *buf,

    uint32_t value)

{

    snprintf(buf, ITEM_LABEL_LENGTH,

               "%s (%c)",

               val_to_str_const(value,

                                ouch_reference_price_type_val,

                                "Unknown"),

               value);

}

/** BASE_CUSTOM formatter for the Time In Force (TIF) code

 *

 * There are three reserved values for the TIF: 0, 99998 and 99999.

 * These are trapped and displayed as an appropriate string.  All

 * other values are printed as a duration in hours, minutes and

 * seconds. */

static void

format_tif(

    char *buf,

    uint32_t value)

{

    uint32_t hours;

    uint32_t mins;

    uint32_t secs;

    switch (value) {

    case 0:

        snprintf(buf, ITEM_LABEL_LENGTH, "Immediate Or Cancel (%u)", value);

        break;

    case 99998:

        snprintf(buf, ITEM_LABEL_LENGTH, "Market Hours (%u)", value);

        break;

    case 99999:

        snprintf(buf, ITEM_LABEL_LENGTH, "System Hours (%u)", value);

        break;

    default:

        hours = value / 3600;

        mins = (value % 3600) / 60;

        secs = value % 60;

        snprintf(buf, ITEM_LABEL_LENGTH,

                   "%uh %02um %02us (%u seconds)",

                   hours, mins, secs,

                   value);

        break;

    }

}

static int

dissect_ouch(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)

{

    proto_item *ti;

    proto_tree *ouch_tree = NULL;

    const char *pkt_name;

    uint16_t reported_len;

    uint8_t pkt_type;

    int offset = 0;

    /* Get the OUCH message type value */

    pkt_type = tvb_get_uint8(tvb, offset);

    reported_len = tvb_reported_length(tvb);

    /* OUCH has two messages with the same code: Replace Order and

     * Replaced.  It's possible to tell which is which because clients

     * send the Replace Order, and NASDAQ sends Replaced replies.

     * Nonetheless, this complicates the switch, so instead we

     * distinguish between them by length, and use 'R' for Replaced

     * (like XPRS does). */

    if (pkt_type == 'U' && (reported_len == 79 || reported_len == 80)) {

        pkt_type = 'R';

    }

    /* OUCH has two messages with the same code: Modify Order and

     * Modified.  Again, one is sent by clients, the other sent by

     * NASDAQ.  We change Modified to 'm' for simplicity in the

     * switch. */

    if (pkt_type == 'M' && reported_len == 28) {

        pkt_type = 'm';

    }

    /* Since we use the packet name a few times, get and save that value */

    pkt_name = val_to_str(pinfo->pool, pkt_type, pkt_type_val, "Unknown (%u)");

    /* Set the protocol name in the summary display */

    col_set_str(pinfo->cinfo, COL_PROTOCOL, "OUCH");

    /* Set the packet name in the info column */

    col_add_str(pinfo->cinfo, COL_INFO, pkt_name);

    if (tree) {

        /* Create a sub-tree for the OUCH packet details */

        ti = proto_tree_add_item(tree,

                                 proto_ouch,

                                 tvb, 0, -1, ENC_NA);

        ouch_tree = proto_item_add_subtree(ti, ett_ouch);

        /* Append the packet name to the sub-tree item */

        proto_item_append_text(ti, ", %s", pkt_name);

        /* Packet type (using the cooked value). */

        proto_tree_add_item(ouch_tree, hf_ouch_packet_type,

                                  tvb, offset, 1, ENC_ASCII);

        offset += 1;

        switch (pkt_type) {

        case 'O': /* Enter Order */

            proto_tree_add_item(ouch_tree,

                                hf_ouch_order_token,

                                tvb, offset, 14,

                                ENC_ASCII);

            offset += 14;

            proto_tree_add_item(ouch_tree,

                                hf_ouch_buy_sell_indicator,

                                tvb, offset, 1,

                                ENC_ASCII);

            offset += 1;

            proto_tree_add_item(ouch_tree,

                                hf_ouch_shares,

                                tvb, offset, 4,

                                ENC_BIG_ENDIAN);

            offset += 4;

            proto_tree_add_item(ouch_tree,

                                hf_ouch_stock,

                                tvb, offset, 8,

                                ENC_ASCII);

            offset += 8;

            proto_tree_add_item(ouch_tree,

                                hf_ouch_price,

                                tvb, offset, 4,

                                ENC_BIG_ENDIAN);

            offset += 4;

            proto_tree_add_item(ouch_tree,

                                hf_ouch_tif,

                                tvb, offset, 4,

                                ENC_BIG_ENDIAN);

            offset += 4;

            proto_tree_add_item(ouch_tree,

                                hf_ouch_firm,

                                tvb, offset, 4,

                                ENC_ASCII);

            offset += 4;

            proto_tree_add_item(ouch_tree,

                                hf_ouch_display,

                                tvb, offset, 1,

                                ENC_ASCII);

            offset += 1;

            proto_tree_add_item(ouch_tree,

                                hf_ouch_capacity,

                                tvb, offset, 1,

                                ENC_ASCII);

            offset += 1;

            proto_tree_add_item(ouch_tree,

                                hf_ouch_iso_eligible,

                                tvb, offset, 1,

                                ENC_ASCII);

            offset += 1;

            proto_tree_add_item(ouch_tree,

                                hf_ouch_min_quantity,

                                tvb, offset, 4,

                                ENC_BIG_ENDIAN);

            offset += 4;

            proto_tree_add_item(ouch_tree,

                                hf_ouch_cross_type,

                                tvb, offset, 1,

                                ENC_ASCII);

            offset += 1;

            if (reported_len >= 49) { /* Added in 4.1 */

                proto_tree_add_item(ouch_tree,

                                    hf_ouch_customer_type,

                                    tvb, offset, 1,

                                    ENC_ASCII);

                offset += 1;

            }

            break;

        case 'A': /* Accepted */

            ouch_tree_add_timestamp(pinfo, ouch_tree,

                                    hf_ouch_timestamp,

                                    tvb, offset);

            offset += 8;

            proto_tree_add_item(ouch_tree,

                                hf_ouch_order_token,

                                tvb, offset, 14,

                                ENC_ASCII);

            offset += 14;

            proto_tree_add_item(ouch_tree,

                                hf_ouch_buy_sell_indicator,

                                tvb, offset, 1,

                                ENC_ASCII);

            offset += 1;

            proto_tree_add_item(ouch_tree,

                                hf_ouch_shares,

                                tvb, offset, 4,

                                ENC_BIG_ENDIAN);

            offset += 4;

            proto_tree_add_item(ouch_tree,

                                hf_ouch_stock,

                                tvb, offset, 8,

                                ENC_ASCII);

            offset += 8;

            proto_tree_add_item(ouch_tree,

                                hf_ouch_price,

                                tvb, offset, 4,

                                ENC_BIG_ENDIAN);

            offset += 4;

            proto_tree_add_item(ouch_tree,

                                hf_ouch_tif,

                                tvb, offset, 4,

                                ENC_BIG_ENDIAN);

            offset += 4;

            proto_tree_add_item(ouch_tree,

                                hf_ouch_firm,

                                tvb, offset, 4,

                                ENC_ASCII);

            offset += 4;

            proto_tree_add_item(ouch_tree,

                                hf_ouch_display,

                                tvb, offset, 1,

                                ENC_ASCII);

            offset += 1;

            proto_tree_add_item(ouch_tree,

                                hf_ouch_order_reference_number,

                                tvb, offset, 8,

                                ENC_BIG_ENDIAN);

            offset += 8;

            proto_tree_add_item(ouch_tree,

                                hf_ouch_capacity,

                                tvb, offset, 1,

                                ENC_ASCII);

            offset += 1;

            proto_tree_add_item(ouch_tree,

                                hf_ouch_iso_eligible,

                                tvb, offset, 1,

                                ENC_ASCII);

            offset += 1;

            proto_tree_add_item(ouch_tree,

                                hf_ouch_min_quantity,

                                tvb, offset, 4,

                                ENC_BIG_ENDIAN);

            offset += 4;

            proto_tree_add_item(ouch_tree,

                                hf_ouch_cross_type,

                                tvb, offset, 1,

                                ENC_ASCII);

            offset += 1;

            proto_tree_add_item(ouch_tree,

                                hf_ouch_order_state,

                                tvb, offset, 1,

                                ENC_ASCII);

            offset += 1;

            if (reported_len >= 66) { /* Added in 4.2 */

                proto_tree_add_item(ouch_tree,

                                    hf_ouch_bbo_weight_indicator,

                                    tvb, offset, 1,

                                    ENC_ASCII);

                offset += 1;

            }

            break;

        case 'U': /* Replace Order */

            proto_tree_add_item(ouch_tree,

                                hf_ouch_existing_order_token,

                                tvb, offset, 14,

                                ENC_ASCII);

            offset += 14;

            proto_tree_add_item(ouch_tree,

                                hf_ouch_replacement_order_token,

                                tvb, offset, 14,

                                ENC_ASCII);

            offset += 14;

            proto_tree_add_item(ouch_tree,

                                hf_ouch_shares,

                                tvb, offset, 4,

                                ENC_BIG_ENDIAN);

            offset += 4;

            proto_tree_add_item(ouch_tree,

                                hf_ouch_price,

                                tvb, offset, 4,

                                ENC_BIG_ENDIAN);

            offset += 4;

            proto_tree_add_item(ouch_tree,

                                hf_ouch_tif,

                                tvb, offset, 4,

                                ENC_BIG_ENDIAN);

            offset += 4;

            proto_tree_add_item(ouch_tree,

                                hf_ouch_display,

                                tvb, offset, 1,

                                ENC_ASCII);

            offset += 1;

            proto_tree_add_item(ouch_tree,

                                hf_ouch_iso_eligible,

                                tvb, offset, 1,

                                ENC_ASCII);

            offset += 1;

            proto_tree_add_item(ouch_tree,

                                hf_ouch_min_quantity,

                                tvb, offset, 4,

                                ENC_BIG_ENDIAN);

            offset += 4;

            break;

        case 'X': /* Cancel Order */

            proto_tree_add_item(ouch_tree,

                                hf_ouch_order_token,

                                tvb, offset, 14,

                                ENC_ASCII);

            offset += 14;

            proto_tree_add_item(ouch_tree,

                                hf_ouch_shares,

                                tvb, offset, 4,

                                ENC_BIG_ENDIAN);

            offset += 4;

            break;

        case 'M': /* Modify Order (from 4.2 onwards) */

            proto_tree_add_item(ouch_tree,

                                hf_ouch_order_token,

                                tvb, offset, 14,

                                ENC_ASCII);

            offset += 14;

            proto_tree_add_item(ouch_tree,

                                hf_ouch_buy_sell_indicator,

                                tvb, offset, 1,

                                ENC_ASCII);

            offset += 1;

            proto_tree_add_item(ouch_tree,

                                hf_ouch_shares,

                                tvb, offset, 4,

                                ENC_BIG_ENDIAN);

            offset += 4;

            break;

        case 'S': /* System Event */

            ouch_tree_add_timestamp(pinfo, ouch_tree,

                                    hf_ouch_timestamp,

                                    tvb, offset);

            offset += 8;

            proto_tree_add_item(ouch_tree,

                                hf_ouch_event_code,

                                tvb, offset, 1,

                                ENC_ASCII);

            offset += 1;

            break;

        case 'R': /* Replaced */

            ouch_tree_add_timestamp(pinfo, ouch_tree,

                                    hf_ouch_timestamp,

                                    tvb, offset);

            offset += 8;

            proto_tree_add_item(ouch_tree,

                                hf_ouch_replacement_order_token,

                                tvb, offset, 14,

                                ENC_ASCII);

            offset += 14;

            proto_tree_add_item(ouch_tree,

                                hf_ouch_buy_sell_indicator,

                                tvb, offset, 1,

                                ENC_ASCII);

            offset += 1;

            proto_tree_add_item(ouch_tree,

                                hf_ouch_shares,

                                tvb, offset, 4,

                                ENC_BIG_ENDIAN);

            offset += 4;

            proto_tree_add_item(ouch_tree,

                                hf_ouch_stock,

                                tvb, offset, 8,

                                ENC_ASCII);

            offset += 8;

            proto_tree_add_item(ouch_tree,

                                hf_ouch_price,

                                tvb, offset, 4,

                                ENC_BIG_ENDIAN);

            offset += 4;

            proto_tree_add_item(ouch_tree,

                                hf_ouch_tif,

                                tvb, offset, 4,

                                ENC_BIG_ENDIAN);

            offset += 4;

            proto_tree_add_item(ouch_tree,

                                hf_ouch_firm,

                                tvb, offset, 4,

                                ENC_ASCII);

            offset += 4;

            proto_tree_add_item(ouch_tree,

                                hf_ouch_display,

                                tvb, offset, 1,

                                ENC_ASCII);

            offset += 1;

            proto_tree_add_item(ouch_tree,

                                hf_ouch_order_reference_number,

                                tvb, offset, 8,

                                ENC_BIG_ENDIAN);

            offset += 8;

            proto_tree_add_item(ouch_tree,

                                hf_ouch_capacity,

                                tvb, offset, 1,

                                ENC_ASCII);

            offset += 1;

            proto_tree_add_item(ouch_tree,

                                hf_ouch_iso_eligible,

                                tvb, offset, 1,

                                ENC_ASCII);

            offset += 1;

            proto_tree_add_item(ouch_tree,

                                hf_ouch_min_quantity,

                                tvb, offset, 4,

                                ENC_BIG_ENDIAN);

            offset += 4;

            proto_tree_add_item(ouch_tree,

                                hf_ouch_cross_type,

                                tvb, offset, 1,

                                ENC_ASCII);

            offset += 1;

            proto_tree_add_item(ouch_tree,

                                hf_ouch_order_state,

                                tvb, offset, 1,

                                ENC_ASCII);

            offset += 1;

            proto_tree_add_item(ouch_tree,

                                hf_ouch_previous_order_token,

                                tvb, offset, 14,

                                ENC_ASCII);

            offset += 14;

            if (reported_len >= 80) { /* Added in 4.2 */

                proto_tree_add_item(ouch_tree,

                                    hf_ouch_bbo_weight_indicator,

                                    tvb, offset, 1,

                                    ENC_ASCII);

                offset += 1;

            }

            break;

        case 'C': /* Canceled */

            ouch_tree_add_timestamp(pinfo, ouch_tree,

                                    hf_ouch_timestamp,

                                    tvb, offset);

            offset += 8;

            proto_tree_add_item(ouch_tree,

                                hf_ouch_order_token,

                                tvb, offset, 14,

                                ENC_ASCII);

            offset += 14;

            proto_tree_add_item(ouch_tree,

                                hf_ouch_decrement_shares,

                                tvb, offset, 4,

                                ENC_BIG_ENDIAN);

            offset += 4;

            proto_tree_add_item(ouch_tree,

                                hf_ouch_cancel_reason,

                                tvb, offset, 1,

                                ENC_ASCII);

            offset += 1;

            break;

        case 'D': /* AIQ Canceled */

            ouch_tree_add_timestamp(pinfo, ouch_tree,

                                    hf_ouch_timestamp,

                                    tvb, offset);

            offset += 8;

            proto_tree_add_item(ouch_tree,

                                hf_ouch_order_token,

                                tvb, offset, 14,

                                ENC_ASCII);

            offset += 14;

            proto_tree_add_item(ouch_tree,

                                hf_ouch_decrement_shares,

                                tvb, offset, 4,

                                ENC_BIG_ENDIAN);

            offset += 4;

            proto_tree_add_item(ouch_tree,

                                hf_ouch_cancel_reason,

                                tvb, offset, 1,

                                ENC_ASCII);

            offset += 1;

            proto_tree_add_item(ouch_tree,

                                hf_ouch_quantity_prevented_from_trading,

                                tvb, offset, 4,

                                ENC_BIG_ENDIAN);

            offset += 4;

            proto_tree_add_item(ouch_tree,

                                hf_ouch_execution_price,

                                tvb, offset, 4,

                                ENC_BIG_ENDIAN);

            offset += 4;

            proto_tree_add_item(ouch_tree,

                                hf_ouch_liquidity_flag,

                                tvb, offset, 1,

                                ENC_ASCII);

            offset += 1;

            break;

        case 'E': /* Executed */

            ouch_tree_add_timestamp(pinfo, ouch_tree,

                                    hf_ouch_timestamp,

                                    tvb, offset);

            offset += 8;

            proto_tree_add_item(ouch_tree,

                                hf_ouch_order_token,

                                tvb, offset, 14,

                                ENC_ASCII);

            offset += 14;

            proto_tree_add_item(ouch_tree,

                                hf_ouch_executed_shares,

                                tvb, offset, 4,

                                ENC_BIG_ENDIAN);

            offset += 4;

            proto_tree_add_item(ouch_tree,

                                hf_ouch_execution_price,

                                tvb, offset, 4,

                                ENC_BIG_ENDIAN);

            offset += 4;

            proto_tree_add_item(ouch_tree,

                                hf_ouch_liquidity_flag,

                                tvb, offset, 1,

                                ENC_ASCII);

            offset += 1;

            proto_tree_add_item(ouch_tree,

                                hf_ouch_match_number,

                                tvb, offset, 8,

                                ENC_BIG_ENDIAN);

            offset += 8;

            break;