GCOV - Varnish Cache


/*-
 * Copyright (c) 2016 Varnish Software AS
 * All rights reserved.
 *
 * Author: Martin Blix Grydeland <martin@varnish-software.com>
 * Author: Dridi Boukelmoune <dridi.boukelmoune@gmail.com>
 *
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * 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, 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 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.
 *
 */

#include "config.h"

#include <stdio.h>
#include <string.h>
#include <limits.h>
#include <stdlib.h>

#include "vdef.h"
#include "vas.h"
#include "miniobj.h"

#include "hpack/vhp.h"

#include "vhp_hufdec.h"

struct vhd_ctx {
        struct vhd_decode *d;
        struct vht_table *tbl;
        const uint8_t *in;
        const uint8_t *in_e;
        char *out;
        char *out_e;
};

typedef enum vhd_ret_e vhd_state_f(struct vhd_ctx *ctx, unsigned first);

/* Function flags */
#define VHD_INCREMENTAL (1U << 0)

/* Functions */
enum vhd_func_e {
#define VHD_FSM_FUNC(NAME, func)                \
        VHD_F_##NAME,
#include "tbl/vhd_fsm_funcs.h"
        VHD_F__MAX,
};
#define VHD_FSM_FUNC(NAME, func)                \
        static vhd_state_f func;
#include "tbl/vhd_fsm_funcs.h"

/* States */
enum vhd_state_e {
        VHD_S__MIN = -1,
#define VHD_FSM(STATE, FUNC, arg1, arg2)        \
        VHD_S_##STATE,
#include "tbl/vhd_fsm.h"
        VHD_S__MAX,
};
static const struct vhd_state {
        const char              *name;
        enum vhd_func_e         func;
        unsigned                arg1;
        unsigned                arg2;
} vhd_states[VHD_S__MAX] = {
#define VHD_FSM(STATE, FUNC, arg1, arg2)        \
        [VHD_S_##STATE] = { #STATE, VHD_F_##FUNC, arg1, arg2 },
#include "tbl/vhd_fsm.h"
};

/* Utility functions */
static void
vhd_set_state(struct vhd_decode *d, enum vhd_state_e state)
{
        AN(d);
        assert(state > VHD_S__MIN && state < VHD_S__MAX);
        d->state = state;
        d->first = 1;
}

static void
vhd_next_state(struct vhd_decode *d)
{
        AN(d);
        assert(d->state + 1 < VHD_S__MAX);
        vhd_set_state(d, d->state + 1);
}

/* State functions */
static enum vhd_ret_e v_matchproto_(vhd_state_f)
vhd_skip(struct vhd_ctx *ctx, unsigned first)
{
        AN(ctx);
        AN(first);
        vhd_next_state(ctx->d);
        return (VHD_AGAIN);
}

static enum vhd_ret_e v_matchproto_(vhd_state_f)
vhd_goto(struct vhd_ctx *ctx, unsigned first)
{
        const struct vhd_state *s;

        AN(ctx);
        AN(first);
        assert(ctx->d->state < VHD_S__MAX);
        s = &vhd_states[ctx->d->state];
        assert(s->arg1 < VHD_S__MAX);
        vhd_set_state(ctx->d, s->arg1);
        return (VHD_AGAIN);
}

static enum vhd_ret_e v_matchproto_(vhd_state_f)
vhd_idle(struct vhd_ctx *ctx, unsigned first)
{
        uint8_t c;

        AN(ctx);
        (void)first;

        while (ctx->in < ctx->in_e) {
                c = *ctx->in;
                if ((c & 0x80) == 0x80)
                        vhd_set_state(ctx->d, VHD_S_HP61_START);
                else if ((c & 0xc0) == 0x40)
                        vhd_set_state(ctx->d, VHD_S_HP621_START);
                else if ((c & 0xf0) == 0x00)
                        vhd_set_state(ctx->d, VHD_S_HP622_START);
                else if ((c & 0xf0) == 0x10)
                        vhd_set_state(ctx->d, VHD_S_HP623_START);
                else if ((c & 0xe0) == 0x20)
                        vhd_set_state(ctx->d, VHD_S_HP63_START);
                else
                        return (VHD_ERR_ARG);
                return (VHD_AGAIN);
        }

        return (VHD_OK);
}

static enum vhd_ret_e v_matchproto_(vhd_state_f)
vhd_integer(struct vhd_ctx *ctx, unsigned first)
{
        const struct vhd_state *s;
        struct vhd_int *i;
        uint8_t c;
        unsigned mask;

        assert(UINT_MAX >= UINT32_MAX);

        AN(ctx);
        assert(ctx->d->state < VHD_S__MAX);
        s = &vhd_states[ctx->d->state];
        i = ctx->d->integer;

        if (first) {
                INIT_OBJ(i, VHD_INT_MAGIC);
                i->pfx = s->arg1;
                assert(i->pfx >= 4 && i->pfx <= 7);
        }
        CHECK_OBJ_NOTNULL(i, VHD_INT_MAGIC);

        while (ctx->in < ctx->in_e) {
                c = *ctx->in;
                ctx->in++;
                if (i->pfx) {
                        mask = (1U << i->pfx) - 1;
                        i->pfx = 0;
                        i->v = c & mask;
                        if (i->v < mask) {
                                vhd_next_state(ctx->d);
                                return (VHD_AGAIN);
                        }
                } else {
                        if ((i->m == 28 && (c & 0x78)) || i->m > 28)
                                return (VHD_ERR_INT);
                        i->v += (c & 0x7f) * ((uint32_t)1 << i->m);
                        i->m += 7;
                        if (!(c & 0x80)) {
                                vhd_next_state(ctx->d);
                                return (VHD_AGAIN);
                        }
                }
        }
        return (VHD_MORE);
}

static enum vhd_ret_e v_matchproto_(vhd_state_f)
vhd_set_max(struct vhd_ctx *ctx, unsigned first)
{
        AN(ctx);
        AN(first);
        CHECK_OBJ_NOTNULL(ctx->d->integer, VHD_INT_MAGIC);
        if (ctx->tbl == NULL)
                return (VHD_ERR_UPD);
        if (VHT_SetMaxTableSize(ctx->tbl, ctx->d->integer->v))
                return (VHD_ERR_UPD);
        vhd_next_state(ctx->d);
        return (VHD_AGAIN);
}

static enum vhd_ret_e v_matchproto_(vhd_state_f)
vhd_set_idx(struct vhd_ctx *ctx, unsigned first)
{
        AN(ctx);
        AN(first);
        CHECK_OBJ_NOTNULL(ctx->d->integer, VHD_INT_MAGIC);
        ctx->d->index = ctx->d->integer->v;
        vhd_next_state(ctx->d);
        return (VHD_AGAIN);
}

static enum vhd_ret_e v_matchproto_(vhd_state_f)
vhd_lookup(struct vhd_ctx *ctx, unsigned first)
{
        const struct vhd_state *s;
        struct vhd_lookup *lu;
        const char *p;
        size_t l;

        AN(ctx);
        assert(ctx->d->state < VHD_S__MAX);
        s = &vhd_states[ctx->d->state];
        lu = ctx->d->lookup;

        if (first)
                INIT_OBJ(lu, VHD_LOOKUP_MAGIC);
        CHECK_OBJ_NOTNULL(lu, VHD_LOOKUP_MAGIC);

        switch (s->arg1) {
        case VHD_NAME:
        case VHD_NAME_SEC:
                p = VHT_LookupName(ctx->tbl, ctx->d->index, &l);
                break;
        case VHD_VALUE:
        case VHD_VALUE_SEC:
                p = VHT_LookupValue(ctx->tbl, ctx->d->index, &l);
                break;
        default:
                WRONG("vhd_lookup wrong arg1");
                break;
        }
        if (first && p == NULL)
                return (VHD_ERR_IDX);
        AN(p);
        assert(l <= UINT_MAX);
        if (first)
                lu->l = l;

        assert(lu->l <= l);
        p += l - lu->l;
        l = vmin_t(size_t, lu->l, ctx->out_e - ctx->out);
        memcpy(ctx->out, p, l);
        ctx->out += l;
        lu->l -= l;

        if (lu->l == 0) {
                vhd_next_state(ctx->d);
                return (s->arg1);
        }
        assert(ctx->out == ctx->out_e);
        return (VHD_BUF);
}

static enum vhd_ret_e v_matchproto_(vhd_state_f)
vhd_new(struct vhd_ctx *ctx, unsigned first)
{
        AN(ctx);
        AN(first);
        if (ctx->tbl != NULL)
                VHT_NewEntry(ctx->tbl);
        vhd_next_state(ctx->d);
        return (VHD_AGAIN);
}

static enum vhd_ret_e v_matchproto_(vhd_state_f)
vhd_new_idx(struct vhd_ctx *ctx, unsigned first)
{
        AN(ctx);
        AN(first);
        if (ctx->tbl != NULL) {
                if (VHT_NewEntry_Indexed(ctx->tbl, ctx->d->index))
                        return (VHD_ERR_IDX);
        }
        vhd_next_state(ctx->d);
        return (VHD_AGAIN);
}

static enum vhd_ret_e v_matchproto_(vhd_state_f)
vhd_branch_zidx(struct vhd_ctx *ctx, unsigned first)
{
        const struct vhd_state *s;

        AN(ctx);
        (void)first;
        assert(ctx->d->state < VHD_S__MAX);
        s = &vhd_states[ctx->d->state];
        assert(s->arg1 < VHD_S__MAX);

        if (ctx->d->index == 0)
                vhd_set_state(ctx->d, s->arg1);
        else
                vhd_next_state(ctx->d);
        return (VHD_AGAIN);
}

static enum vhd_ret_e v_matchproto_(vhd_state_f)
vhd_branch_bit0(struct vhd_ctx *ctx, unsigned first)
{
        const struct vhd_state *s;

        AN(ctx);
        (void)first;
        assert(ctx->d->state < VHD_S__MAX);
        s = &vhd_states[ctx->d->state];
        assert(s->arg1 < VHD_S__MAX);

        if (ctx->in == ctx->in_e)
                return (VHD_MORE);

        if (*ctx->in & 0x80)
                vhd_set_state(ctx->d, s->arg1);
        else
                vhd_next_state(ctx->d);
        return (VHD_AGAIN);
}

static enum vhd_ret_e v_matchproto_(vhd_state_f)
vhd_raw(struct vhd_ctx *ctx, unsigned first)
{
        const struct vhd_state *s;
        struct vhd_raw *raw;
        size_t l2;

        AN(ctx);
        assert(ctx->d->state < VHD_S__MAX);
        s = &vhd_states[ctx->d->state];

        raw = ctx->d->raw;
        if (first) {
                CHECK_OBJ_NOTNULL(ctx->d->integer, VHD_INT_MAGIC);
                l2 = ctx->d->integer->v;
                INIT_OBJ(raw, VHD_RAW_MAGIC);
                raw->l = l2;
        }
        CHECK_OBJ_NOTNULL(raw, VHD_RAW_MAGIC);

        while (raw->l > 0) {
                l2 = raw->l;
                if (l2 > (ctx->in_e - ctx->in))
                        l2 = ctx->in_e - ctx->in;
                if (l2 == 0)
                        return (VHD_MORE);
                if (l2 > (ctx->out_e - ctx->out))
                        l2 = ctx->out_e - ctx->out;
                if (l2 == 0)
                        return (VHD_BUF);
                memcpy(ctx->out, ctx->in, l2);
                ctx->in += l2;
                if (ctx->tbl != NULL && (s->arg2 & VHD_INCREMENTAL)) {
                        switch (s->arg1) {
                        case VHD_NAME:
                                VHT_AppendName(ctx->tbl, ctx->out, l2);
                                break;
                        case VHD_VALUE:
                                VHT_AppendValue(ctx->tbl, ctx->out, l2);
                                break;
                        default:
                                WRONG("vhd_raw wrong arg1");
                                break;
                        }
                }
                ctx->out += l2;
                raw->l -= l2;
        }
        vhd_next_state(ctx->d);
        return (s->arg1);
}

static enum vhd_ret_e v_matchproto_(vhd_state_f)
vhd_huffman(struct vhd_ctx *ctx, unsigned first)
{
        const struct vhd_state *s;
        struct vhd_huffman *huf;
        enum vhd_ret_e r;
        unsigned u, l;

        AN(ctx);
        assert(ctx->d->state < VHD_S__MAX);
        s = &vhd_states[ctx->d->state];

        huf = ctx->d->huffman;
        if (first) {
                CHECK_OBJ_NOTNULL(ctx->d->integer, VHD_INT_MAGIC);
                l = ctx->d->integer->v;
                INIT_OBJ(huf, VHD_HUFFMAN_MAGIC);
                huf->len = l;
        }
        CHECK_OBJ_NOTNULL(huf, VHD_HUFFMAN_MAGIC);

        r = VHD_OK;
        l = 0;
        while (1) {
                assert(huf->pos < HUFDEC_LEN);
                assert(hufdec[huf->pos].mask > 0);
                assert(hufdec[huf->pos].mask <= 8);

                if (huf->len > 0 && huf->blen < hufdec[huf->pos].mask) {
                        /* Refill from input */
                        if (ctx->in == ctx->in_e) {
                                r = VHD_MORE;
                                break;
                        }
                        huf->bits = (huf->bits << 8) | *ctx->in;
                        huf->blen += 8;
                        huf->len--;
                        ctx->in++;
                }

                if (huf->len == 0 && huf->pos == 0 && huf->blen <= 7 &&
                    huf->bits == (1U << huf->blen) - 1U) {
                        /* End of stream */
                        r = s->arg1;
                        vhd_next_state(ctx->d);
                        break;
                }

                if (ctx->out + l == ctx->out_e) {
                        r = VHD_BUF;
                        break;
                }

                if (huf->blen >= hufdec[huf->pos].mask)
                        u = huf->bits >> (huf->blen - hufdec[huf->pos].mask);
                else
                        u = huf->bits << (hufdec[huf->pos].mask - huf->blen);
                huf->pos += u;
                assert(huf->pos < HUFDEC_LEN);

                if (hufdec[huf->pos].len == 0 ||
                    hufdec[huf->pos].len > huf->blen) {
                        /* Invalid or incomplete code */
                        r = VHD_ERR_HUF;
                        break;
                }

                huf->blen -= hufdec[huf->pos].len;
                huf->bits &= (1U << huf->blen) - 1U;

                if (hufdec[huf->pos].jump) {
                        huf->pos += hufdec[huf->pos].jump;
                        assert(huf->pos < HUFDEC_LEN);
                } else {
                        ctx->out[l++] = hufdec[huf->pos].chr;
                        huf->pos = 0;
                }
        }

        if (l > 0 && ctx->tbl != NULL && (s->arg2 & VHD_INCREMENTAL)) {
                switch (s->arg1) {
                case VHD_NAME:
                        VHT_AppendName(ctx->tbl, ctx->out, l);
                        break;
                case VHD_VALUE:
                        VHT_AppendValue(ctx->tbl, ctx->out, l);
                        break;
                default:
                        WRONG("vhd_raw wrong arg1");
                        break;
                }
        }
        ctx->out += l;

        assert(r != VHD_OK);
        return (r);
}

/* Public interface */

const char *
VHD_Error(enum vhd_ret_e r)
{
        switch (r) {
#define VHD_RET(NAME, VAL, DESC)                        \
        case VHD_##NAME:                                \
                return ("VHD_" #NAME " (" DESC ")");
#include "tbl/vhd_return.h"
        default:
                return ("VHD_UNKNOWN");
        }
}

enum vhd_ret_e
VHD_Decode(struct vhd_decode *d, struct vht_table *tbl,
    const uint8_t *in, size_t inlen, size_t *p_inused,
    char *out, size_t outlen, size_t *p_outused)
{
        const struct vhd_state *s;
        struct vhd_ctx ctx[1];
        enum vhd_ret_e ret;
        unsigned first;

        CHECK_OBJ_NOTNULL(d, VHD_DECODE_MAGIC);
        CHECK_OBJ_ORNULL(tbl, VHT_TABLE_MAGIC);
        AN(in);
        AN(p_inused);
        AN(out);
        AN(p_outused);

        if (d->error < 0)
                return (d->error);

        assert(*p_inused <= inlen);
        assert(*p_outused <= outlen);

        ctx->d = d;
        ctx->tbl = tbl;
        ctx->in = in + *p_inused;
        ctx->in_e = in + inlen;
        ctx->out = out + *p_outused;
        ctx->out_e = out + outlen;

        do {
                first = d->first;
                d->first = 0;
                assert(d->state < VHD_S__MAX);
                s = &vhd_states[d->state];
                switch (s->func) {
#define VHD_FSM_FUNC(NAME, func)                \
                case VHD_F_##NAME:              \
                        ret = func(ctx, first); \
                        break;
#include "tbl/vhd_fsm_funcs.h"
                default:
                        WRONG("Undefined vhd function");
                        break;
                }
        } while (ret == VHD_AGAIN);

        if (ret < 0)
                d->error = ret;

        assert(in + *p_inused <= ctx->in);
        *p_inused += ctx->in - (in + *p_inused);
        assert(out + *p_outused <= ctx->out);
        *p_outused += ctx->out - (out + *p_outused);

        return (ret);
}

void
VHD_Init(struct vhd_decode *d)
{

        AN(d);
        assert(VHD_S__MAX <= UINT16_MAX);
        assert(HUFDEC_LEN <= UINT16_MAX);
        INIT_OBJ(d, VHD_DECODE_MAGIC);
        d->state = VHD_S_IDLE;
        d->first = 1;
}

/* Test driver */

#ifdef DECODE_TEST_DRIVER

#include <ctype.h>
#include <stdarg.h>

static int verbose = 0;

static size_t
hexbuf(uint8_t *buf, size_t buflen, const char *h)
{
        size_t l;
        uint8_t u;

        AN(h);
        AN(buf);

        l = 0;
        for (; *h != '\0'; h++) {
                if (l == buflen * 2)
                        WRONG("Too small buffer");
                if (isspace(*h))
                        continue;
                if (*h >= '0' && *h <= '9')
                        u = *h - '0';
                else if (*h >= 'a' && *h <= 'f')
                        u = 0xa + *h - 'a';
                else if (*h >= 'A' && *h <= 'F')
                        u = 0xa + *h - 'A';
                else
                        WRONG("Bad input character");
                assert(u <= 0xf);
                if (l % 2 == 0) {
                        u <<= 4;
                        buf[l / 2] = u;
                } else {
                        buf[l / 2] |= u;
                }
                l++;
        }
        AZ(l % 2);
        return (l / 2);
}

static int
match(const char *b, size_t l, ...)
{
        va_list ap;
        const char *e;
        const char *m;
        int r = 0;

        va_start(ap, l);
        e = b + l;
        while (1) {
                m = va_arg(ap, const char *);
                if (m == NULL)
                        break;
                l = strlen(m);
                if (e - b <= l || b[l] != '\0' || strncmp(b, m, l)) {
                        printf("%.*s != %s\n", (int)(e - b), b, m);
                        r = -1;
                        break;
                } else if (verbose) {
                        printf("%s == %s\n", b, m);
                }
                b += l + 1;
        }
        va_end(ap);
        return (r);
}

#define M_1IN (1U << 0)
#define M_1OUT (1U << 1)

static enum vhd_ret_e
decode(struct vhd_decode *d, struct vht_table *tbl, uint8_t *in, size_t in_l,
    char *out, size_t out_l, unsigned m)
{
        size_t in_u, out_u;
        enum vhd_ret_e r;

        CHECK_OBJ_NOTNULL(d, VHD_DECODE_MAGIC);
        AN(in);
        AN(out);

        in_u = 0;
        out_u = 0;

        while (1) {
                r = VHD_Decode(d, tbl, in,
                    (m & M_1IN ? (in_l > in_u ? in_u + 1 : in_u) : in_l),
                    &in_u,
                    out,
                    (m & M_1OUT ? (out_l > out_u ? out_u + 1 : out_u) : out_l),
                    &out_u);
                assert(in_u <= in_l);
                assert(out_u <= out_l);
                if (r < VHD_OK)
                        return (r);

                switch (r) {
                case VHD_OK:
                        return (r);

                case VHD_MORE:
                        if (in_u == in_l)
                                return (r);
                        break;

                case VHD_BUF:
                        if (out_u == out_l)
                                return (r);
                        break;

                case VHD_NAME:
                case VHD_NAME_SEC:
                        assert(out_l - out_u > 0);
                        out[out_u++] = '\0';
                        if (verbose)
                                printf("Name%s: '%s'\n",
                                    (r == VHD_NAME_SEC ? " (sec)" : ""),
                                    out);
                        out += out_u;
                        out_l -= out_u;
                        out_u = 0;
                        break;

                case VHD_VALUE:
                case VHD_VALUE_SEC:
                        assert(out_l - out_u > 0);
                        out[out_u++] = '\0';
                        if (verbose)
                                printf("Value%s: '%s'\n",
                                    (r == VHD_VALUE_SEC ? " (sec)" : ""),
                                    out);
                        out += out_u;
                        out_l -= out_u;
                        out_u = 0;
                        break;

                default:
                        WRONG("Wrong return code");
                        break;
                }
        }

        NEEDLESS(return (VHD_OK));
}

#define CHECK_RET(r, e)                                 \
        do {                                            \
                if (verbose || r != e) {                \
                        printf("%s %s %s\n",            \
                            VHD_Error(r),               \
                            (r == e ? "==" : "!="),     \
                            VHD_Error(e));              \
                }                                       \
                assert(r == e);                         \
        } while (0)

#define CHECK_INT(d, u)                                                 \
        do {                                                            \
                CHECK_OBJ_NOTNULL(d->integer, VHD_INT_MAGIC);           \
                if (verbose || d->integer->v != u) {                    \
                        printf("%u %s %u\n", d->integer->v,             \
                            (d->integer->v == u ? "==" : "!="),         \
                            u);                                         \
                }                                                       \
                assert(d->integer->v == u);                             \
        } while (0)

static void
test_integer(unsigned mode)
{
        struct vhd_decode d[1];
        uint8_t in[128];
        size_t in_l;
        char out[128];
        enum vhd_ret_e r;

        /* Test single byte decoding */
        VHD_Init(d);
        vhd_set_state(d, VHD_S_TEST_INT5);
        in_l = hexbuf(in, sizeof in, "1e");
        r = decode(d, NULL, in, in_l, out, sizeof out, mode);
        CHECK_RET(r, VHD_OK);
        CHECK_INT(d, 30);

        /* Test multibyte decoding */
        VHD_Init(d);
        vhd_set_state(d, VHD_S_TEST_INT5);
        in_l = hexbuf(in, sizeof in, "ff 9a 0a");
        r = decode(d, NULL, in, in_l, out, sizeof out, mode);
        CHECK_RET(r, VHD_OK);
        CHECK_INT(d, 1337);

        /* Test max size we allow */
        VHD_Init(d);
        vhd_set_state(d, VHD_S_TEST_INT5);
        in_l = hexbuf(in, sizeof in, "1f ff ff ff ff 07");
        r = decode(d, NULL, in, in_l, out, sizeof out, mode);
        CHECK_RET(r, VHD_OK);
        CHECK_INT(d, 0x8000001E);

        /* Test overflow */
        VHD_Init(d);
        vhd_set_state(d, VHD_S_TEST_INT5);
        in_l = hexbuf(in, sizeof in, "1f ff ff ff ff 08");
        r = decode(d, NULL, in, in_l, out, sizeof out, mode);
        CHECK_RET(r, VHD_ERR_INT);
}

static void
test_raw(unsigned mode)
{
        struct vhd_decode d[1];
        uint8_t in[128];
        size_t in_l;
        char out[128];
        enum vhd_ret_e r;

        /* Test raw encoding */
        VHD_Init(d);
        vhd_set_state(d, VHD_S_TEST_LITERAL);
        in_l = hexbuf(in, sizeof in,
            "0a63 7573 746f 6d2d 6b65 790d 6375 7374 6f6d 2d68 6561 6465 72");
        r = decode(d, NULL, in, in_l, out, sizeof out, mode);
        CHECK_RET(r, VHD_OK);
        AZ(match(out, sizeof out, "custom-key", "custom-header", NULL));

        /* Test too short input */
        VHD_Init(d);
        vhd_set_state(d, VHD_S_TEST_LITERAL);
        in_l = hexbuf(in, sizeof in,
            "02");
        r = decode(d, NULL, in, in_l, out, sizeof out, mode);
        CHECK_RET(r, VHD_MORE);
}

static void
test_huffman(unsigned mode)
{
        struct vhd_decode d[1];
        uint8_t in[256];
        size_t in_l;
        char out[256];
        enum vhd_ret_e r;

        /* Decode a huffman encoded value */
        VHD_Init(d);
        in_l = hexbuf(in, sizeof in,
            "0141 8cf1 e3c2 e5f2 3a6b a0ab 90f4 ff");
        vhd_set_state(d, VHD_S_TEST_LITERAL);
        r = decode(d, NULL, in, in_l, out, sizeof out, mode);
        CHECK_RET(r, VHD_OK);
        AZ(match(out, sizeof out, "A", "www.example.com", NULL));

        /* Decode an incomplete input buffer */
        VHD_Init(d);
        in_l = hexbuf(in, sizeof in,
            "0141 81");
        vhd_set_state(d, VHD_S_TEST_LITERAL);
        r = decode(d, NULL, in, in_l, out, sizeof out, mode);
        CHECK_RET(r, VHD_MORE);

        /* Decode an incomplete huffman code */
        VHD_Init(d);
        in_l = hexbuf(in, sizeof in,
            "0141 81 fe");
        vhd_set_state(d, VHD_S_TEST_LITERAL);
        r = decode(d, NULL, in, in_l, out, sizeof out, mode);
        CHECK_RET(r, VHD_ERR_HUF);

        /* Decode an invalid huffman code */
        VHD_Init(d);
        in_l = hexbuf(in, sizeof in,
            "0141 84 ff ff ff ff");
        vhd_set_state(d, VHD_S_TEST_LITERAL);
        r = decode(d, NULL, in, in_l, out, sizeof out, mode);
        CHECK_RET(r, VHD_ERR_HUF);
}

static void
test_c2(unsigned mode)
{
        struct vhd_decode d[1];
        uint8_t in[256];
        size_t in_l;
        char out[256];
        enum vhd_ret_e r;

        /* See RFC 7541 Appendix C.2 */

        VHD_Init(d);

        /* C.2.1 */
        in_l = hexbuf(in, sizeof in,
            "400a 6375 7374 6f6d 2d6b 6579 0d63 7573"
            "746f 6d2d 6865 6164 6572");
        r = decode(d, NULL, in, in_l, out, sizeof out, mode);
        CHECK_RET(r, VHD_OK);
        AZ(match(out, sizeof out,
                "custom-key", "custom-header",
                NULL));

        /* C.2.2 */
        in_l = hexbuf(in, sizeof in,
            "040c 2f73 616d 706c 652f 7061 7468");
        r = decode(d, NULL, in, in_l, out, sizeof out, mode);
        CHECK_RET(r, VHD_OK);
        AZ(match(out, sizeof out,
                ":path", "/sample/path",
                NULL));

        /* C.2.3 */
        in_l = hexbuf(in, sizeof in,
            "1008 7061 7373 776f 7264 0673 6563 7265"
            "74");
        r = decode(d, NULL, in, in_l, out, sizeof out, mode);
        CHECK_RET(r, VHD_OK);
        AZ(match(out, sizeof out,
                "password", "secret",
                NULL));

        /* C.2.4 */
        in_l = hexbuf(in, sizeof in,
            "82");
        r = decode(d, NULL, in, in_l, out, sizeof out, mode);
        CHECK_RET(r, VHD_OK);
        AZ(match(out, sizeof out,
                ":method", "GET",
                NULL));
}

static void
test_c3(unsigned mode)
{
        struct vht_table t[1];
        struct vhd_decode d[1];
        uint8_t in[256];
        size_t in_l;
        char out[256];
        enum vhd_ret_e r;

        /* See RFC 7541 Appendix C.3 */

        AZ(VHT_Init(t, 4096));
        VHD_Init(d);

        /* C.3.1 */
        in_l = hexbuf(in, sizeof in,
            "8286 8441 0f77 7777 2e65 7861 6d70 6c65"
            "2e63 6f6d");
        r = decode(d, t, in, in_l, out, sizeof out, mode);
        CHECK_RET(r, VHD_OK);
        AZ(match(out, sizeof out,
                ":method", "GET",
                ":scheme", "http",
                ":path", "/",
                ":authority", "www.example.com",
                NULL));

        /* C.3.2 */
        in_l = hexbuf(in, sizeof in,
            "8286 84be 5808 6e6f 2d63 6163 6865");
        r = decode(d, t, in, in_l, out, sizeof out, mode);
        CHECK_RET(r, VHD_OK);
        AZ(match(out, sizeof out,
                ":method", "GET",
                ":scheme", "http",
                ":path", "/",
                ":authority", "www.example.com",
                "cache-control", "no-cache",
                NULL));

        /* C.3.3 */
        in_l = hexbuf(in, sizeof in,
            "8287 85bf 400a 6375 7374 6f6d 2d6b 6579"
            "0c63 7573 746f 6d2d 7661 6c75 65");
        r = decode(d, t, in, in_l, out, sizeof out, mode);
        CHECK_RET(r, VHD_OK);
        AZ(match(out, sizeof out,
                ":method", "GET",
                ":scheme", "https",
                ":path", "/index.html",
                ":authority", "www.example.com",
                "custom-key", "custom-value",
                NULL));

        VHT_Fini(t);
}

static void
test_c4(unsigned mode)
{
        struct vht_table t[1];
        struct vhd_decode d[1];
        uint8_t in[256];
        size_t in_l;
        char out[256];
        enum vhd_ret_e r;

        /* See RFC 7541 Appendix C.4 */

        AZ(VHT_Init(t, 4096));
        VHD_Init(d);

        /* C.4.1 */
        in_l = hexbuf(in, sizeof in,
            "8286 8441 8cf1 e3c2 e5f2 3a6b a0ab 90f4 ff");
        r = decode(d, t, in, in_l, out, sizeof out, mode);
        CHECK_RET(r, VHD_OK);
        AZ(match(out, sizeof out,
                ":method", "GET",
                ":scheme", "http",
                ":path", "/",
                ":authority", "www.example.com",
                NULL));

        /* C.4.2 */
        in_l = hexbuf(in, sizeof in,
            "8286 84be 5886 a8eb 1064 9cbf");
        r = decode(d, t, in, in_l, out, sizeof out, mode);
        CHECK_RET(r, VHD_OK);
        AZ(match(out, sizeof out,
                ":method", "GET",
                ":scheme", "http",
                ":path", "/",
                ":authority", "www.example.com",
                "cache-control", "no-cache",
                NULL));

        /* C.4.3 */
        in_l = hexbuf(in, sizeof in,
            "8287 85bf 4088 25a8 49e9 5ba9 7d7f 8925"
            "a849 e95b b8e8 b4bf");
        r = decode(d, t, in, in_l, out, sizeof out, mode);
        CHECK_RET(r, VHD_OK);
        AZ(match(out, sizeof out,
                ":method", "GET",
                ":scheme", "https",
                ":path", "/index.html",
                ":authority", "www.example.com",
                "custom-key", "custom-value",
                NULL));

        VHT_Fini(t);
}

static void
test_c5(unsigned mode)
{
        struct vht_table t[1];
        struct vhd_decode d[1];
        uint8_t in[256];
        size_t in_l;
        char out[256];
        enum vhd_ret_e r;

        /* See RFC 7541 Appendix C.5 */

        AZ(VHT_Init(t, 256));
        VHD_Init(d);

        /* C.5.1 */
        in_l = hexbuf(in, sizeof in,
            "4803 3330 3258 0770 7269 7661 7465 611d"
            "4d6f 6e2c 2032 3120 4f63 7420 3230 3133"
            "2032 303a 3133 3a32 3120 474d 546e 1768"
            "7474 7073 3a2f 2f77 7777 2e65 7861 6d70"
            "6c65 2e63 6f6d");
        r = decode(d, t, in, in_l, out, sizeof out, mode);
        CHECK_RET(r, VHD_OK);
        AZ(match(out, sizeof out,
                ":status", "302",
                "cache-control", "private",
                "date", "Mon, 21 Oct 2013 20:13:21 GMT",
                "location", "https://www.example.com",
                NULL));

        /* C.5.2 */
        in_l = hexbuf(in, sizeof in,
            "4803 3330 37c1 c0bf");
        r = decode(d, t, in, in_l, out, sizeof out, mode);
        CHECK_RET(r, VHD_OK);
        AZ(match(out, sizeof out,
                ":status", "307",
                "cache-control", "private",
                "date", "Mon, 21 Oct 2013 20:13:21 GMT",
                "location", "https://www.example.com",
                NULL));

        /* C.5.3 */
        in_l = hexbuf(in, sizeof in,
            "88c1 611d 4d6f 6e2c 2032 3120 4f63 7420"
            "3230 3133 2032 303a 3133 3a32 3220 474d"
            "54c0 5a04 677a 6970 7738 666f 6f3d 4153"
            "444a 4b48 514b 425a 584f 5157 454f 5049"
            "5541 5851 5745 4f49 553b 206d 6178 2d61"
            "6765 3d33 3630 303b 2076 6572 7369 6f6e"
            "3d31");
        r = decode(d, t, in, in_l, out, sizeof out, mode);
        CHECK_RET(r, VHD_OK);
        AZ(match(out, sizeof out,
                ":status", "200",
                "cache-control", "private",
                "date", "Mon, 21 Oct 2013 20:13:22 GMT",
                "location", "https://www.example.com",
                "content-encoding", "gzip",
                "set-cookie",
                "foo=ASDJKHQKBZXOQWEOPIUAXQWEOIU; max-age=3600; version=1",
                NULL));

        VHT_Fini(t);
}

static void
test_c6(unsigned mode)
{
        struct vht_table t[1];
        struct vhd_decode d[1];
        uint8_t in[256];
        size_t in_l;
        char out[256];
        enum vhd_ret_e r;

        /* See RFC 7541 Appendix C.6 */

        AZ(VHT_Init(t, 256));
        VHD_Init(d);

        /* C.6.1 */
        in_l = hexbuf(in, sizeof in,
            "4882 6402 5885 aec3 771a 4b61 96d0 7abe"
            "9410 54d4 44a8 2005 9504 0b81 66e0 82a6"
            "2d1b ff6e 919d 29ad 1718 63c7 8f0b 97c8"
            "e9ae 82ae 43d3");
        r = decode(d, t, in, in_l, out, sizeof out, mode);
        CHECK_RET(r, VHD_OK);
        AZ(match(out, sizeof out,
                ":status", "302",
                "cache-control", "private",
                "date", "Mon, 21 Oct 2013 20:13:21 GMT",
                "location", "https://www.example.com",
                NULL));

        /* C.6.2 */
        in_l = hexbuf(in, sizeof in,
            "4883 640e ffc1 c0bf");
        r = decode(d, t, in, in_l, out, sizeof out, mode);
        CHECK_RET(r, VHD_OK);
        AZ(match(out, sizeof out,
                ":status", "307",
                "cache-control", "private",
                "date", "Mon, 21 Oct 2013 20:13:21 GMT",
                "location", "https://www.example.com",
                NULL));

        /* C.6.3 */
        in_l = hexbuf(in, sizeof in,
            "88c1 6196 d07a be94 1054 d444 a820 0595"
            "040b 8166 e084 a62d 1bff c05a 839b d9ab"
            "77ad 94e7 821d d7f2 e6c7 b335 dfdf cd5b"
            "3960 d5af 2708 7f36 72c1 ab27 0fb5 291f"
            "9587 3160 65c0 03ed 4ee5 b106 3d50 07");
        r = decode(d, t, in, in_l, out, sizeof out, mode);
        CHECK_RET(r, VHD_OK);
        AZ(match(out, sizeof out,
                ":status", "200",
                "cache-control", "private",
                "date", "Mon, 21 Oct 2013 20:13:22 GMT",
                "location", "https://www.example.com",
                "content-encoding", "gzip",
                "set-cookie",
                "foo=ASDJKHQKBZXOQWEOPIUAXQWEOIU; max-age=3600; version=1",
                NULL));

        VHT_Fini(t);
}

#define do_test(name)                                           \
        do {                                                    \
                printf("Doing test: %s\n", #name);              \
                name(0);                                        \
                printf("Doing test: %s 1IN\n", #name);          \
                name(M_1IN);                                    \
                printf("Doing test: %s 1OUT\n", #name);         \
                name(M_1OUT);                                   \
                printf("Doing test: %s 1IN|1OUT\n", #name);     \
                name(M_1IN|M_1OUT);                             \
                printf("Test finished: %s\n\n", #name);         \
        } while (0)

int
main(int argc, char **argv)
{
        if (argc == 2 && !strcmp(argv[1], "-v"))
                verbose = 1;
        else if (argc != 1) {
                fprintf(stderr, "Usage: %s [-v]\n", argv[0]);
                return (1);
        }

        if (verbose) {
                printf("sizeof (struct vhd_int)=%zu\n",
                    sizeof (struct vhd_int));
                printf("sizeof (struct vhd_lookup)=%zu\n",
                    sizeof (struct vhd_lookup));
                printf("sizeof (struct vhd_raw)=%zu\n",
                    sizeof (struct vhd_raw));
                printf("sizeof (struct vhd_huffman)=%zu\n",
                    sizeof (struct vhd_huffman));
                printf("sizeof (struct vhd_decode)=%zu\n",
                    sizeof (struct vhd_decode));
        }

        do_test(test_integer);
        do_test(test_raw);
        do_test(test_huffman);

        do_test(test_c2);
        do_test(test_c3);
        do_test(test_c4);
        do_test(test_c5);
        do_test(test_c6);

        return (0);
}

#endif  /* DECODE_TEST_DRIVER */

		varnish-cache/bin/varnishd/hpack/vhp_decode.c
0		/*-
1		* Copyright (c) 2016 Varnish Software AS
2		* All rights reserved.
3		*
4		* Author: Martin Blix Grydeland <martin@varnish-software.com>
5		* Author: Dridi Boukelmoune <dridi.boukelmoune@gmail.com>
6		*
7		* SPDX-License-Identifier: BSD-2-Clause
8		*
9		* Redistribution and use in source and binary forms, with or without
10		* modification, are permitted provided that the following conditions
11		* are met:
12		* 1. Redistributions of source code must retain the above copyright
13		* notice, this list of conditions and the following disclaimer.
14		* 2. Redistributions in binary form must reproduce the above copyright
15		* notice, this list of conditions and the following disclaimer in the
16		* documentation and/or other materials provided with the distribution.
17		*
18		* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19		* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20		* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21		* ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
22		* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23		* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24		* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25		* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26		* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27		* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28		* SUCH DAMAGE.
29		*
30		*/
31
32		#include "config.h"
33
34		#include <stdio.h>
35		#include <string.h>
36		#include <limits.h>
37		#include <stdlib.h>
38
39		#include "vdef.h"
40		#include "vas.h"
41		#include "miniobj.h"
42
43		#include "hpack/vhp.h"
44
45		#include "vhp_hufdec.h"
46
47		struct vhd_ctx {
48		struct vhd_decode *d;
49		struct vht_table *tbl;
50		const uint8_t *in;
51		const uint8_t *in_e;
52		char *out;
53		char *out_e;
54		};
55
56		typedef enum vhd_ret_e vhd_state_f(struct vhd_ctx *ctx, unsigned first);
57
58		/* Function flags */
59		#define VHD_INCREMENTAL (1U << 0)
60
61		/* Functions */
62		enum vhd_func_e {
63		#define VHD_FSM_FUNC(NAME, func) \
64		VHD_F_##NAME,
65		#include "tbl/vhd_fsm_funcs.h"
66		VHD_F__MAX,
67		};
68		#define VHD_FSM_FUNC(NAME, func) \
69		static vhd_state_f func;
70		#include "tbl/vhd_fsm_funcs.h"
71
72		/* States */
73		enum vhd_state_e {
74		VHD_S__MIN = -1,
75		#define VHD_FSM(STATE, FUNC, arg1, arg2) \
76		VHD_S_##STATE,
77		#include "tbl/vhd_fsm.h"
78		VHD_S__MAX,
79		};
80		static const struct vhd_state {
81		const char *name;
82		enum vhd_func_e func;
83		unsigned arg1;
84		unsigned arg2;
85		} vhd_states[VHD_S__MAX] = {
86		#define VHD_FSM(STATE, FUNC, arg1, arg2) \
87		[VHD_S_##STATE] = { #STATE, VHD_F_##FUNC, arg1, arg2 },
88		#include "tbl/vhd_fsm.h"
89		};
90
91		/* Utility functions */
92		static void
93	55045	vhd_set_state(struct vhd_decode *d, enum vhd_state_e state)
94		{
95	55045	AN(d);
96	55045	assert(state > VHD_S__MIN && state < VHD_S__MAX);
97	55045	d->state = state;
98	55045	d->first = 1;
99	55045	}
100
101		static void
102	38490	vhd_next_state(struct vhd_decode *d)
103		{
104	38490	AN(d);
105	38490	assert(d->state + 1 < VHD_S__MAX);
106	38490	vhd_set_state(d, d->state + 1);
107	38490	}
108
109		/* State functions */
110		static enum vhd_ret_e v_matchproto_(vhd_state_f)
111	9950	vhd_skip(struct vhd_ctx *ctx, unsigned first)
112		{
113	9950	AN(ctx);
114	9950	AN(first);
115	9950	vhd_next_state(ctx->d);
116	9950	return (VHD_AGAIN);
117		}
118
119		static enum vhd_ret_e v_matchproto_(vhd_state_f)
120	9400	vhd_goto(struct vhd_ctx *ctx, unsigned first)
121		{
122		const struct vhd_state *s;
123
124	9400	AN(ctx);
125	9400	AN(first);
126	9400	assert(ctx->d->state < VHD_S__MAX);
127	9400	s = &vhd_states[ctx->d->state];
128	9400	assert(s->arg1 < VHD_S__MAX);
129	9400	vhd_set_state(ctx->d, s->arg1);
130	9400	return (VHD_AGAIN);
131		}
132
133		static enum vhd_ret_e v_matchproto_(vhd_state_f)
134	5020	vhd_idle(struct vhd_ctx *ctx, unsigned first)
135		{
136		uint8_t c;
137
138	5020	AN(ctx);
139	5020	(void)first;
140
141	5020	while (ctx->in < ctx->in_e) {
142	3905	c = *ctx->in;
143	3905	if ((c & 0x80) == 0x80)
144	750	vhd_set_state(ctx->d, VHD_S_HP61_START);
145	3155	else if ((c & 0xc0) == 0x40)
146	480	vhd_set_state(ctx->d, VHD_S_HP621_START);
147	2675	else if ((c & 0xf0) == 0x00)
148	2650	vhd_set_state(ctx->d, VHD_S_HP622_START);
149	25	else if ((c & 0xf0) == 0x10)
150	25	vhd_set_state(ctx->d, VHD_S_HP623_START);
151	0	else if ((c & 0xe0) == 0x20)
152	0	vhd_set_state(ctx->d, VHD_S_HP63_START);
153		else
154	0	return (VHD_ERR_ARG);
155	3905	return (VHD_AGAIN);
156		}
157
158	1115	return (VHD_OK);
159	5020	}
160
161		static enum vhd_ret_e v_matchproto_(vhd_state_f)
162	10195	vhd_integer(struct vhd_ctx *ctx, unsigned first)
163		{
164		const struct vhd_state *s;
165		struct vhd_int *i;
166		uint8_t c;
167		unsigned mask;
168
169	10195	assert(UINT_MAX >= UINT32_MAX);
170
171	10195	AN(ctx);
172	10195	assert(ctx->d->state < VHD_S__MAX);
173	10195	s = &vhd_states[ctx->d->state];
174	10195	i = ctx->d->integer;
175
176	10195	if (first) {
177	10075	INIT_OBJ(i, VHD_INT_MAGIC);
178	10075	i->pfx = s->arg1;
179	10075	assert(i->pfx >= 4 && i->pfx <= 7);
180	10075	}
181	10195	CHECK_OBJ_NOTNULL(i, VHD_INT_MAGIC);
182
183	10610	while (ctx->in < ctx->in_e) {
184	10490	c = *ctx->in;
185	10490	ctx->in++;
186	10490	if (i->pfx) {
187	10075	mask = (1U << i->pfx) - 1;
188	10075	i->pfx = 0;
189	10075	i->v = c & mask;
190	10075	if (i->v < mask) {
191	9940	vhd_next_state(ctx->d);
192	9940	return (VHD_AGAIN);
193		}
194	135	} else {
195	415	if ((i->m == 28 && (c & 0x78)) \|\| i->m > 28)
196	30	return (VHD_ERR_INT);
197	385	i->v += (c & 0x7f) * ((uint32_t)1 << i->m);
198	385	i->m += 7;
199	385	if (!(c & 0x80)) {
200	105	vhd_next_state(ctx->d);
201	105	return (VHD_AGAIN);
202		}
203		}
204		}
205	120	return (VHD_MORE);
206	10195	}
207
208		static enum vhd_ret_e v_matchproto_(vhd_state_f)
209	0	vhd_set_max(struct vhd_ctx *ctx, unsigned first)
210		{
211	0	AN(ctx);
212	0	AN(first);
213	0	CHECK_OBJ_NOTNULL(ctx->d->integer, VHD_INT_MAGIC);
214	0	if (ctx->tbl == NULL)
215	0	return (VHD_ERR_UPD);
216	0	if (VHT_SetMaxTableSize(ctx->tbl, ctx->d->integer->v))
217	0	return (VHD_ERR_UPD);
218	0	vhd_next_state(ctx->d);
219	0	return (VHD_AGAIN);
220	0	}
221
222		static enum vhd_ret_e v_matchproto_(vhd_state_f)
223	3895	vhd_set_idx(struct vhd_ctx *ctx, unsigned first)
224		{
225	3895	AN(ctx);
226	3895	AN(first);
227	3895	CHECK_OBJ_NOTNULL(ctx->d->integer, VHD_INT_MAGIC);
228	3895	ctx->d->index = ctx->d->integer->v;
229	3895	vhd_next_state(ctx->d);
230	3895	return (VHD_AGAIN);
231		}
232
233		static enum vhd_ret_e v_matchproto_(vhd_state_f)
234	8740	vhd_lookup(struct vhd_ctx *ctx, unsigned first)
235		{
236		const struct vhd_state *s;
237		struct vhd_lookup *lu;
238		const char *p;
239		size_t l;
240
241	8740	AN(ctx);
242	8740	assert(ctx->d->state < VHD_S__MAX);
243	8740	s = &vhd_states[ctx->d->state];
244	8740	lu = ctx->d->lookup;
245
246	8740	if (first)
247	1920	INIT_OBJ(lu, VHD_LOOKUP_MAGIC);
248	8740	CHECK_OBJ_NOTNULL(lu, VHD_LOOKUP_MAGIC);
249
250	8740	switch (s->arg1) {
251		case VHD_NAME:
252		case VHD_NAME_SEC:
253	5180	p = VHT_LookupName(ctx->tbl, ctx->d->index, &l);
254	5180	break;
255		case VHD_VALUE:
256		case VHD_VALUE_SEC:
257	3560	p = VHT_LookupValue(ctx->tbl, ctx->d->index, &l);
258	3560	break;
259		default:
260	0	WRONG("vhd_lookup wrong arg1");
261	0	break;
262		}
263	8740	if (first && p == NULL)
264	0	return (VHD_ERR_IDX);
265	8740	AN(p);
266	8740	assert(l <= UINT_MAX);
267	8740	if (first)
268	1920	lu->l = l;
269
270	8740	assert(lu->l <= l);
271	8740	p += l - lu->l;
272	8740	l = vmin_t(size_t, lu->l, ctx->out_e - ctx->out);
273	8740	memcpy(ctx->out, p, l);
274	8740	ctx->out += l;
275	8740	lu->l -= l;
276
277	8740	if (lu->l == 0) {
278	1920	vhd_next_state(ctx->d);
279	1920	return (s->arg1);
280		}
281	6820	assert(ctx->out == ctx->out_e);
282	6820	return (VHD_BUF);
283	8740	}
284
285		static enum vhd_ret_e v_matchproto_(vhd_state_f)
286	65	vhd_new(struct vhd_ctx *ctx, unsigned first)
287		{
288	65	AN(ctx);
289	65	AN(first);
290	65	if (ctx->tbl != NULL)
291	45	VHT_NewEntry(ctx->tbl);
292	65	vhd_next_state(ctx->d);
293	65	return (VHD_AGAIN);
294		}
295
296		static enum vhd_ret_e v_matchproto_(vhd_state_f)
297	415	vhd_new_idx(struct vhd_ctx *ctx, unsigned first)
298		{
299	415	AN(ctx);
300	415	AN(first);
301	415	if (ctx->tbl != NULL) {
302	415	if (VHT_NewEntry_Indexed(ctx->tbl, ctx->d->index))
303	0	return (VHD_ERR_IDX);
304	415	}
305	415	vhd_next_state(ctx->d);
306	415	return (VHD_AGAIN);
307	415	}
308
309		static enum vhd_ret_e v_matchproto_(vhd_state_f)
310	3155	vhd_branch_zidx(struct vhd_ctx *ctx, unsigned first)
311		{
312		const struct vhd_state *s;
313
314	3155	AN(ctx);
315	3155	(void)first;
316	3155	assert(ctx->d->state < VHD_S__MAX);
317	3155	s = &vhd_states[ctx->d->state];
318	3155	assert(s->arg1 < VHD_S__MAX);
319
320	3155	if (ctx->d->index == 0)
321	2715	vhd_set_state(ctx->d, s->arg1);
322		else
323	440	vhd_next_state(ctx->d);
324	3155	return (VHD_AGAIN);
325		}
326
327		static enum vhd_ret_e v_matchproto_(vhd_state_f)
328	6130	vhd_branch_bit0(struct vhd_ctx *ctx, unsigned first)
329		{
330		const struct vhd_state *s;
331
332	6130	AN(ctx);
333	6130	(void)first;
334	6130	assert(ctx->d->state < VHD_S__MAX);
335	6130	s = &vhd_states[ctx->d->state];
336	6130	assert(s->arg1 < VHD_S__MAX);
337
338	6130	if (ctx->in == ctx->in_e)
339	40	return (VHD_MORE);
340
341	6090	if (*ctx->in & 0x80)
342	335	vhd_set_state(ctx->d, s->arg1);
343		else
344	5755	vhd_next_state(ctx->d);
345	6090	return (VHD_AGAIN);
346	6130	}
347
348		static enum vhd_ret_e v_matchproto_(vhd_state_f)
349	9770	vhd_raw(struct vhd_ctx *ctx, unsigned first)
350		{
351		const struct vhd_state *s;
352		struct vhd_raw *raw;
353		size_t l2;
354
355	9770	AN(ctx);
356	9770	assert(ctx->d->state < VHD_S__MAX);
357	9770	s = &vhd_states[ctx->d->state];
358
359	9770	raw = ctx->d->raw;
360	9770	if (first) {
361	5755	CHECK_OBJ_NOTNULL(ctx->d->integer, VHD_INT_MAGIC);
362	5755	l2 = ctx->d->integer->v;
363	5755	INIT_OBJ(raw, VHD_RAW_MAGIC);
364	5755	raw->l = l2;
365	5755	}
366	9770	CHECK_OBJ_NOTNULL(raw, VHD_RAW_MAGIC);
367
368	19255	while (raw->l > 0) {
369	13525	l2 = raw->l;
370	13525	if (l2 > (ctx->in_e - ctx->in))
371	5300	l2 = ctx->in_e - ctx->in;
372	13525	if (l2 == 0)
373	2775	return (VHD_MORE);
374	10750	if (l2 > (ctx->out_e - ctx->out))
375	2530	l2 = ctx->out_e - ctx->out;
376	10750	if (l2 == 0)
377	1265	return (VHD_BUF);
378	9485	memcpy(ctx->out, ctx->in, l2);
379	9485	ctx->in += l2;
380	9485	if (ctx->tbl != NULL && (s->arg2 & VHD_INCREMENTAL)) {
381	3055	switch (s->arg1) {
382		case VHD_NAME:
383	155	VHT_AppendName(ctx->tbl, ctx->out, l2);
384	155	break;
385		case VHD_VALUE:
386	2900	VHT_AppendValue(ctx->tbl, ctx->out, l2);
387	2900	break;
388		default:
389	0	WRONG("vhd_raw wrong arg1");
390	0	break;
391		}
392	3055	}
393	9485	ctx->out += l2;
394	9485	raw->l -= l2;
395		}
396	5730	vhd_next_state(ctx->d);
397	5730	return (s->arg1);
398	9770	}
399
400		static enum vhd_ret_e v_matchproto_(vhd_state_f)
401	3290	vhd_huffman(struct vhd_ctx *ctx, unsigned first)
402		{
403		const struct vhd_state *s;
404		struct vhd_huffman *huf;
405		enum vhd_ret_e r;
406		unsigned u, l;
407
408	3290	AN(ctx);
409	3290	assert(ctx->d->state < VHD_S__MAX);
410	3290	s = &vhd_states[ctx->d->state];
411
412	3290	huf = ctx->d->huffman;
413	3290	if (first) {
414	335	CHECK_OBJ_NOTNULL(ctx->d->integer, VHD_INT_MAGIC);
415	335	l = ctx->d->integer->v;
416	335	INIT_OBJ(huf, VHD_HUFFMAN_MAGIC);
417	335	huf->len = l;
418	335	}
419	3290	CHECK_OBJ_NOTNULL(huf, VHD_HUFFMAN_MAGIC);
420
421	3290	r = VHD_OK;
422	3290	l = 0;
423	7890	while (1) {
424	7890	assert(huf->pos < HUFDEC_LEN);
425	7890	assert(hufdec[huf->pos].mask > 0);
426	7890	assert(hufdec[huf->pos].mask <= 8);
427
428	7890	if (huf->len > 0 && huf->blen < hufdec[huf->pos].mask) {
429		/* Refill from input */
430	4675	if (ctx->in == ctx->in_e) {
431	1140	r = VHD_MORE;
432	1140	break;
433		}
434	3535	huf->bits = (huf->bits << 8) \| *ctx->in;
435	3535	huf->blen += 8;
436	3535	huf->len--;
437	3535	ctx->in++;
438	3535	}
439
440	6750	if (huf->len == 0 && huf->pos == 0 && huf->blen <= 7 &&
441	425	huf->bits == (1U << huf->blen) - 1U) {
442		/* End of stream */
443	275	r = s->arg1;
444	275	vhd_next_state(ctx->d);
445	275	break;
446		}
447
448	6475	if (ctx->out + l == ctx->out_e) {
449	1835	r = VHD_BUF;
450	1835	break;
451		}
452
453	4640	if (huf->blen >= hufdec[huf->pos].mask)
454	4520	u = huf->bits >> (huf->blen - hufdec[huf->pos].mask);
455		else
456	120	u = huf->bits << (hufdec[huf->pos].mask - huf->blen);
457	4640	huf->pos += u;
458	4640	assert(huf->pos < HUFDEC_LEN);
459
460	4640	if (hufdec[huf->pos].len == 0 \|\|
461	4620	hufdec[huf->pos].len > huf->blen) {
462		/* Invalid or incomplete code */
463	40	r = VHD_ERR_HUF;
464	40	break;
465		}
466
467	4600	huf->blen -= hufdec[huf->pos].len;
468	4600	huf->bits &= (1U << huf->blen) - 1U;
469
470	4600	if (hufdec[huf->pos].jump) {
471	180	huf->pos += hufdec[huf->pos].jump;
472	180	assert(huf->pos < HUFDEC_LEN);
473	180	} else {
474	4420	ctx->out[l++] = hufdec[huf->pos].chr;
475	4420	huf->pos = 0;
476		}
477		}
478
479	3290	if (l > 0 && ctx->tbl != NULL && (s->arg2 & VHD_INCREMENTAL)) {
480	2835	switch (s->arg1) {
481		case VHD_NAME:
482	150	VHT_AppendName(ctx->tbl, ctx->out, l);
483	150	break;
484		case VHD_VALUE:
485	2685	VHT_AppendValue(ctx->tbl, ctx->out, l);
486	2685	break;
487		default:
488	0	WRONG("vhd_raw wrong arg1");
489	0	break;
490		}
491	2835	}
492	3290	ctx->out += l;
493
494	3290	assert(r != VHD_OK);
495	3290	return (r);
496		}
497
498		/* Public interface */
499