ng_pred1.c

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/*-
 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
 *
 * Copyright (c) 2006 Alexander Motin <mav@alkar.net>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice unmodified, this list of conditions, and the following
 *    disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * $FreeBSD$
 */
 
/*
 * Predictor-1 PPP compression netgraph node type.
 */
 
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/mbuf.h>
#include <sys/malloc.h>
#include <sys/errno.h>
#include <sys/syslog.h>
 
#include <netgraph/ng_message.h>
#include <netgraph/netgraph.h>
#include <netgraph/ng_parse.h>
#include <netgraph/ng_pred1.h>
 
#include "opt_netgraph.h"
 
static MALLOC_DEFINE(M_NETGRAPH_PRED1, "netgraph_pred1", "netgraph pred1 node");
 
/* PRED1 header length */
#define PRED1_HDRLEN            2
 
#define PRED1_TABLE_SIZE        0x10000
#define PRED1_BUF_SIZE          4096
#define PPP_INITFCS             0xffff  /* Initial FCS value */
#define PPP_GOODFCS             0xf0b8  /* Good final FCS value */
 
/*
 * The following hash code is the heart of the algorithm:
 * it builds a sliding hash sum of the previous 3-and-a-bit
 * characters which will be used to index the guess table.
 * A better hash function would result in additional compression,
 * at the expense of time.
 */
 
#define HASH(x) priv->Hash = (priv->Hash << 4) ^ (x)
 
/* Node private data */
struct ng_pred1_private {
        struct ng_pred1_config cfg;             /* configuration */
        u_char          GuessTable[PRED1_TABLE_SIZE];   /* dictionary */
        u_char          inbuf[PRED1_BUF_SIZE];  /* input buffer */
        u_char          outbuf[PRED1_BUF_SIZE]; /* output buffer */
        struct ng_pred1_stats stats;            /* statistics */
        uint16_t        Hash;
        ng_ID_t         ctrlnode;               /* path to controlling node */
        uint16_t        seqnum;                 /* sequence number */
        u_char          compress;               /* compress/decompress flag */
};
typedef struct ng_pred1_private *priv_p;
 
/* Netgraph node methods */
static ng_constructor_t ng_pred1_constructor;
static ng_rcvmsg_t      ng_pred1_rcvmsg;
static ng_shutdown_t    ng_pred1_shutdown;
static ng_newhook_t     ng_pred1_newhook;
static ng_rcvdata_t     ng_pred1_rcvdata;
static ng_disconnect_t  ng_pred1_disconnect;
 
/* Helper functions */
static int      ng_pred1_compress(node_p node, struct mbuf *m,
                    struct mbuf **resultp);
static int      ng_pred1_decompress(node_p node, struct mbuf *m,
                    struct mbuf **resultp);
static void     Pred1Init(node_p node);
static int      Pred1Compress(node_p node, u_char *source, u_char *dest,
                    int len);
static int      Pred1Decompress(node_p node, u_char *source, u_char *dest,
                    int slen, int dlen);
static void     Pred1SyncTable(node_p node, u_char *source, int len);
static uint16_t Crc16(uint16_t fcs, u_char *cp, int len);
 
static const uint16_t   Crc16Table[];
 
/* Parse type for struct ng_pred1_config. */
static const struct ng_parse_struct_field ng_pred1_config_type_fields[]
        = NG_PRED1_CONFIG_INFO;
static const struct ng_parse_type ng_pred1_config_type = {
        &ng_parse_struct_type,
        ng_pred1_config_type_fields
};
 
/* Parse type for struct ng_pred1_stat. */
static const struct ng_parse_struct_field ng_pred1_stats_type_fields[]
        = NG_PRED1_STATS_INFO;
static const struct ng_parse_type ng_pred1_stat_type = {
        &ng_parse_struct_type,
        ng_pred1_stats_type_fields
};
 
/* List of commands and how to convert arguments to/from ASCII. */
static const struct ng_cmdlist ng_pred1_cmds[] = {
        {
          NGM_PRED1_COOKIE,
          NGM_PRED1_CONFIG,
          "config",
          &ng_pred1_config_type,
          NULL
        },
        {
          NGM_PRED1_COOKIE,
          NGM_PRED1_RESETREQ,
          "resetreq",
          NULL,
          NULL
        },
        {
          NGM_PRED1_COOKIE,
          NGM_PRED1_GET_STATS,
          "getstats",
          NULL,
          &ng_pred1_stat_type
        },
        {
          NGM_PRED1_COOKIE,
          NGM_PRED1_CLR_STATS,
          "clrstats",
          NULL,
          NULL
        },
        {
          NGM_PRED1_COOKIE,
          NGM_PRED1_GETCLR_STATS,
          "getclrstats",
          NULL,
          &ng_pred1_stat_type
        },
        { 0 }
};
 
/* Node type descriptor */
static struct ng_type ng_pred1_typestruct = {
        .version =      NG_ABI_VERSION,
        .name =         NG_PRED1_NODE_TYPE,
        .constructor =  ng_pred1_constructor,
        .rcvmsg =       ng_pred1_rcvmsg,
        .shutdown =     ng_pred1_shutdown,
        .newhook =      ng_pred1_newhook,
        .rcvdata =      ng_pred1_rcvdata,
        .disconnect =   ng_pred1_disconnect,
        .cmdlist =      ng_pred1_cmds,
};
NETGRAPH_INIT(pred1, &ng_pred1_typestruct);
 
#define ERROUT(x)       do { error = (x); goto done; } while (0)
 
/************************************************************************
                        NETGRAPH NODE STUFF
 ************************************************************************/
 
/*
 * Node type constructor
 */
static int
ng_pred1_constructor(node_p node)
{
        priv_p priv;
 
        /* Allocate private structure. */
        priv = malloc(sizeof(*priv), M_NETGRAPH_PRED1, M_WAITOK | M_ZERO);
 
        NG_NODE_SET_PRIVATE(node, priv);
 
        /* This node is not thread safe. */
        NG_NODE_FORCE_WRITER(node);
 
        /* Done */
        return (0);
}
 
/*
 * Give our OK for a hook to be added.
 */
static int
ng_pred1_newhook(node_p node, hook_p hook, const char *name)
{
        const priv_p priv = NG_NODE_PRIVATE(node);
 
        if (NG_NODE_NUMHOOKS(node) > 0)
                return (EINVAL);
 
        if (strcmp(name, NG_PRED1_HOOK_COMP) == 0)
                priv->compress = 1;
        else if (strcmp(name, NG_PRED1_HOOK_DECOMP) == 0)
                priv->compress = 0;
        else
                return (EINVAL);
 
        return (0);
}
 
/*
 * Receive a control message.
 */
static int
ng_pred1_rcvmsg(node_p node, item_p item, hook_p lasthook)
{
        const priv_p priv = NG_NODE_PRIVATE(node);
        struct ng_mesg *resp = NULL;
        int error = 0;
        struct ng_mesg *msg;
 
        NGI_GET_MSG(item, msg);
 
        if (msg->header.typecookie != NGM_PRED1_COOKIE)
                ERROUT(EINVAL);
 
        switch (msg->header.cmd) {
        case NGM_PRED1_CONFIG:
            {
                struct ng_pred1_config *const cfg =
                    (struct ng_pred1_config *)msg->data;
 
                /* Check configuration. */
                if (msg->header.arglen != sizeof(*cfg))
                        ERROUT(EINVAL);
 
                /* Configuration is OK, reset to it. */
                priv->cfg = *cfg;
 
                /* Save return address so we can send reset-req's. */
                priv->ctrlnode = NGI_RETADDR(item);
 
                /* Clear our state. */
                Pred1Init(node);
 
                break;
            }
        case NGM_PRED1_RESETREQ:
                Pred1Init(node);
                break;
 
        case NGM_PRED1_GET_STATS:
        case NGM_PRED1_CLR_STATS:
        case NGM_PRED1_GETCLR_STATS:
            {
                /* Create response. */
                if (msg->header.cmd != NGM_PRED1_CLR_STATS) {
                        NG_MKRESPONSE(resp, msg,
                            sizeof(struct ng_pred1_stats), M_NOWAIT);
                        if (resp == NULL)
                                ERROUT(ENOMEM);
                        bcopy(&priv->stats, resp->data,
                            sizeof(struct ng_pred1_stats));
                }
 
                if (msg->header.cmd != NGM_PRED1_GET_STATS)
                        bzero(&priv->stats, sizeof(struct ng_pred1_stats));
                break;
            }
 
        default:
                error = EINVAL;
                break;
        }
done:
        NG_RESPOND_MSG(error, node, item, resp);
        NG_FREE_MSG(msg);
        return (error);
}
 
/*
 * Receive incoming data on our hook.
 */
static int
ng_pred1_rcvdata(hook_p hook, item_p item)
{
        const node_p node = NG_HOOK_NODE(hook);
        const priv_p priv = NG_NODE_PRIVATE(node);
        struct mbuf *m, *out;
        int error;
 
        if (!priv->cfg.enable) {
                NG_FREE_ITEM(item);
                return (ENXIO);
        }
 
        NGI_GET_M(item, m);
        /* Compress. */
        if (priv->compress) {
                if ((error = ng_pred1_compress(node, m, &out)) != 0) {
                        NG_FREE_ITEM(item);
                        log(LOG_NOTICE, "%s: error: %d\n", __func__, error);
                        return (error);
                }
 
        } else { /* Decompress. */
                if ((error = ng_pred1_decompress(node, m, &out)) != 0) {
                        NG_FREE_ITEM(item);
                        log(LOG_NOTICE, "%s: error: %d\n", __func__, error);
                        if (priv->ctrlnode != 0) {
                                struct ng_mesg *msg;
 
                                /* Need to send a reset-request. */
                                NG_MKMESSAGE(msg, NGM_PRED1_COOKIE,
                                    NGM_PRED1_RESETREQ, 0, M_NOWAIT);
                                if (msg == NULL)
                                        return (error);
                                NG_SEND_MSG_ID(error, node, msg,
                                    priv->ctrlnode, 0);
                        }
                        return (error);
                }
        }
 
        NG_FWD_NEW_DATA(error, item, hook, out);
        return (error);
}
 
/*
 * Destroy node.
 */
static int
ng_pred1_shutdown(node_p node)
{
        const priv_p priv = NG_NODE_PRIVATE(node);
 
        free(priv, M_NETGRAPH_PRED1);
        NG_NODE_SET_PRIVATE(node, NULL);
        NG_NODE_UNREF(node);            /* Let the node escape. */
        return (0);
}
 
/*
 * Hook disconnection
 */
static int
ng_pred1_disconnect(hook_p hook)
{
        const node_p node = NG_HOOK_NODE(hook);
 
        Pred1Init(node);
 
        /* Go away if no longer connected. */
        if ((NG_NODE_NUMHOOKS(node) == 0) && NG_NODE_IS_VALID(node))
                ng_rmnode_self(node);
        return (0);
}
 
/************************************************************************
                        HELPER STUFF
 ************************************************************************/
 
/*
 * Compress/encrypt a packet and put the result in a new mbuf at *resultp.
 * The original mbuf is not free'd.
 */
static int
ng_pred1_compress(node_p node, struct mbuf *m, struct mbuf **resultp)
{
        const priv_p    priv = NG_NODE_PRIVATE(node);
        int             outlen, inlen;
        u_char          *out;
        uint16_t        fcs, lenn;
        int             len;
 
        /* Initialize. */
        *resultp = NULL;
 
        inlen = m->m_pkthdr.len;
 
        priv->stats.FramesPlain++;
        priv->stats.InOctets += inlen;
 
        /* Reserve space for expansion. */
        if (inlen > (PRED1_BUF_SIZE*8/9 + 1 + 4)) {
                priv->stats.Errors++;
                NG_FREE_M(m);
                return (ENOMEM);
        }
 
        /* We must own the mbuf chain exclusively to modify it. */
        m = m_unshare(m, M_NOWAIT);
        if (m == NULL) {
                priv->stats.Errors++;
                return (ENOMEM);
        }
 
        /* Work with contiguous regions of memory. */
        m_copydata(m, 0, inlen, (caddr_t)(priv->inbuf + 2));
 
        lenn = htons(inlen & 0x7FFF);
 
        /* Compute FCS. */
        fcs = Crc16(PPP_INITFCS, (u_char *)&lenn, 2);
        fcs = Crc16(fcs, priv->inbuf + 2, inlen);
        fcs = ~fcs;
 
        /* Compress data. */
        len = Pred1Compress(node, priv->inbuf + 2, priv->outbuf + 2, inlen);
 
        /* What happened? */
        if (len < inlen) {
                out = priv->outbuf;
                outlen = 2 + len;
                *(uint16_t *)out = lenn;
                *out |= 0x80;
                priv->stats.FramesComp++;
        } else {
                out = priv->inbuf;
                outlen = 2 + inlen;
                *(uint16_t *)out = lenn;
                priv->stats.FramesUncomp++;
        }
 
        /* Add FCS. */
        (out + outlen)[0] = fcs & 0xFF;
        (out + outlen)[1] = fcs >> 8;
 
        /* Calculate resulting size. */
        outlen += 2;
 
        /* Return packet in an mbuf. */
        m_copyback(m, 0, outlen, (caddr_t)out);
        if (m->m_pkthdr.len < outlen) {
                m_freem(m);
                priv->stats.Errors++;
                return (ENOMEM);
        } else if (outlen < m->m_pkthdr.len)
                m_adj(m, outlen - m->m_pkthdr.len);
        *resultp = m;
        priv->stats.OutOctets += outlen;
 
        return (0);
}
 
/*
 * Decompress/decrypt packet and put the result in a new mbuf at *resultp.
 * The original mbuf is not free'd.
 */
static int
ng_pred1_decompress(node_p node, struct mbuf *m, struct mbuf **resultp)
{
        const priv_p    priv = NG_NODE_PRIVATE(node);
        int             inlen;
        uint16_t        len, len1, cf, lenn;
        uint16_t        fcs;
 
        /* Initialize. */
        *resultp = NULL;
 
        inlen = m->m_pkthdr.len;
 
        if (inlen > PRED1_BUF_SIZE) {
                priv->stats.Errors++;
                NG_FREE_M(m);
                return (ENOMEM);
        }
 
        /* We must own the mbuf chain exclusively to modify it. */
        m = m_unshare(m, M_NOWAIT);
        if (m == NULL) {
                priv->stats.Errors++;
                return (ENOMEM);
        }
 
        /* Work with contiguous regions of memory. */
        m_copydata(m, 0, inlen, (caddr_t)priv->inbuf);
 
        priv->stats.InOctets += inlen;
 
        /* Get initial length value. */
        len = priv->inbuf[0] << 8;
        len += priv->inbuf[1];
 
        cf = (len & 0x8000);
        len &= 0x7fff;
 
        /* Is data compressed or not really? */
        if (cf) {
                priv->stats.FramesComp++;
                len1 = Pred1Decompress(node, priv->inbuf + 2, priv->outbuf,
                    inlen - 4, PRED1_BUF_SIZE);
                if (len != len1) {
                        /* Error is detected. Send reset request */
                        m_freem(m);
                        priv->stats.Errors++;
                        log(LOG_NOTICE, "ng_pred1: Comp length error (%d) "
                            "--> len (%d)\n", len, len1);
                        return (EIO);
                }
 
                /*
                 * CRC check on receive is defined in RFC. It is surely required
                 * for compressed frames to signal dictionary corruption,
                 * but it is actually useless for uncompressed frames because
                 * the same check has already done by HDLC and/or other layer.
                 */
                lenn = htons(len);
                fcs = Crc16(PPP_INITFCS, (u_char *)&lenn, 2);
                fcs = Crc16(fcs, priv->outbuf, len);
                fcs = Crc16(fcs, priv->inbuf + inlen - 2, 2);
 
                if (fcs != PPP_GOODFCS) {
                        m_freem(m);
                        priv->stats.Errors++;
                        log(LOG_NOTICE, "ng_pred1: Pred1: Bad CRC-16\n");
                        return (EIO);
                }
 
                /* Return packet in an mbuf. */
                m_copyback(m, 0, len, (caddr_t)priv->outbuf);
                if (m->m_pkthdr.len < len) {
                        m_freem(m);
                        priv->stats.Errors++;
                        return (ENOMEM);
                } else if (len < m->m_pkthdr.len)
                        m_adj(m, len - m->m_pkthdr.len);
                *resultp = m;
 
        } else {
                priv->stats.FramesUncomp++;
                if (len != (inlen - 4)) {
                        /* Wrong length. Send reset request */
                        priv->stats.Errors++;
                        log(LOG_NOTICE, "ng_pred1: Uncomp length error (%d) "
                            "--> len (%d)\n", len, inlen - 4);
                        NG_FREE_M(m);
                        return (EIO);
                }
                Pred1SyncTable(node, priv->inbuf + 2, len);
                m_adj(m, 2);    /* Strip length. */
                m_adj(m, -2);   /* Strip fcs. */
                *resultp = m;
        }
 
        priv->stats.FramesPlain++;
        priv->stats.OutOctets += len;
 
        return (0);
}
 
/*
 * Pred1Init()
 */
 
static void
Pred1Init(node_p node)
{
        const priv_p priv = NG_NODE_PRIVATE(node);
 
        priv->Hash = 0;
        memset(priv->GuessTable, 0, PRED1_TABLE_SIZE);
}
 
/*
 * Pred1Compress()
 */
 
static int
Pred1Compress(node_p node, u_char *source, u_char *dest, int len)
{
        const priv_p    priv = NG_NODE_PRIVATE(node);
        int             i;
        u_char          flags;
        u_char          *flagdest, *orgdest;
 
        orgdest = dest;
        while (len) {
                flagdest = dest++;
                flags = 0;      /* All guesses are wrong initially. */
                for (i = 0; i < 8 && len; i++) {
                        if (priv->GuessTable[priv->Hash] == *source)
                                /* Guess was right - don't output. */
                                flags |= (1 << i);
                        else {
                                /* Guess wrong, output char. */
                                priv->GuessTable[priv->Hash] = *source;
                                *dest++ = *source;
                        }
                        HASH(*source++);
                        len--;
                }
                *flagdest = flags;
        }
        return (dest - orgdest);
}
 
/*
 * Pred1Decompress()
 *
 * Returns decompressed size, or -1 if we ran out of space.
 */
 
static int
Pred1Decompress(node_p node, u_char *source, u_char *dest, int slen, int dlen)
{
        const priv_p    priv = NG_NODE_PRIVATE(node);
        int             i;
        u_char          flags, *orgdest;
 
        orgdest = dest;
        while (slen) {
                flags = *source++;
                slen--;
                for (i = 0; i < 8; i++, flags >>= 1) {
                        if (dlen <= 0)
                                return(-1);
                        if (flags & 0x01)
                                /* Guess correct */
                                *dest = priv->GuessTable[priv->Hash];
                        else {
                                if (!slen)
                                        /* We seem to be really done -- cabo. */
                                        break;
 
                                /* Guess wrong. */
                                priv->GuessTable[priv->Hash] = *source;
                                /* Read from source. */
                                *dest = *source++;
                                slen--;
                        }
                        HASH(*dest++);
                        dlen--;
                }
        }
        return (dest - orgdest);
}
 
/*
 * Pred1SyncTable()
 */
 
static void
Pred1SyncTable(node_p node, u_char *source, int len)
{
        const priv_p priv = NG_NODE_PRIVATE(node);
 
        while (len--) {
                priv->GuessTable[priv->Hash] = *source;
                HASH(*source++);
        }
}
 
/*
 * Crc16()
 *
 * Compute the 16 bit frame check value, per RFC 1171 Appendix B,
 * on an array of bytes.
 */
 
static uint16_t
Crc16(uint16_t crc, u_char *cp, int len)
{
        while (len--)
                crc = (crc >> 8) ^ Crc16Table[(crc ^ *cp++) & 0xff];
        return (crc);
}
 
static const uint16_t Crc16Table[256] = {
/* 00 */    0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf,
/* 08 */    0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7,
/* 10 */    0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e,
/* 18 */    0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff, 0xe876,
/* 20 */    0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd,
/* 28 */    0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5,
/* 30 */    0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c,
/* 38 */    0xbdcb, 0xac42, 0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974,
/* 40 */    0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb,
/* 48 */    0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3,
/* 50 */    0x5285, 0x430c, 0x7197, 0x601e, 0x14a1, 0x0528, 0x37b3, 0x263a,
/* 58 */    0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72,
/* 60 */    0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9,
/* 68 */    0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1,
/* 70 */    0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738,
/* 78 */    0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70,
/* 80 */    0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7,
/* 88 */    0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff,
/* 90 */    0x9489, 0x8500, 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036,
/* 98 */    0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e,
/* a0 */    0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5,
/* a8 */    0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd,
/* b0 */    0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134,
/* b8 */    0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c,
/* c0 */    0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3,
/* c8 */    0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb,
/* d0 */    0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232,
/* d8 */    0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a,
/* e0 */    0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1,
/* e8 */    0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9,
/* f0 */    0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330,
/* f8 */    0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78
};