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	160173	vhd_set_state(struct vhd_decode *d, enum vhd_state_e state)
94		{
95	160173	AN(d);
96	160173	assert(state > VHD_S__MIN && state < VHD_S__MAX);
97	160173	d->state = state;
98	160173	d->first = 1;
99	160173	}
100
101		static void
102	111800	vhd_next_state(struct vhd_decode *d)
103		{
104	111800	AN(d);
105	111800	assert(d->state + 1 < VHD_S__MAX);
106	111800	vhd_set_state(d, d->state + 1);
107	111800	}
108
109		/* State functions */
110		static enum vhd_ret_e v_matchproto_(vhd_state_f)
111	29068	vhd_skip(struct vhd_ctx *ctx, unsigned first)
112		{
113	29068	AN(ctx);
114	29068	AN(first);
115	29068	vhd_next_state(ctx->d);
116	29068	return (VHD_AGAIN);
117		}
118
119		static enum vhd_ret_e v_matchproto_(vhd_state_f)
120	27638	vhd_goto(struct vhd_ctx *ctx, unsigned first)
121		{
122		const struct vhd_state *s;
123
124	27638	AN(ctx);
125	27638	AN(first);
126	27638	assert(ctx->d->state < VHD_S__MAX);
127	27638	s = &vhd_states[ctx->d->state];
128	27638	assert(s->arg1 < VHD_S__MAX);
129	27638	vhd_set_state(ctx->d, s->arg1);
130	27638	return (VHD_AGAIN);
131		}
132
133		static enum vhd_ret_e v_matchproto_(vhd_state_f)
134	14456	vhd_idle(struct vhd_ctx *ctx, unsigned first)
135		{
136		uint8_t c;
137
138	14456	AN(ctx);
139	14456	(void)first;
140
141	14456	while (ctx->in < ctx->in_e) {
142	11219	c = *ctx->in;
143	11219	if ((c & 0x80) == 0x80)
144	1950	vhd_set_state(ctx->d, VHD_S_HP61_START);
145	9269	else if ((c & 0xc0) == 0x40)
146	1248	vhd_set_state(ctx->d, VHD_S_HP621_START);
147	8021	else if ((c & 0xf0) == 0x00)
148	7956	vhd_set_state(ctx->d, VHD_S_HP622_START);
149	65	else if ((c & 0xf0) == 0x10)
150	65	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	11219	return (VHD_AGAIN);
156		}
157
158	3237	return (VHD_OK);
159	14456	}
160
161		static enum vhd_ret_e v_matchproto_(vhd_state_f)
162	29705	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	29705	assert(UINT_MAX >= UINT32_MAX);
170
171	29705	AN(ctx);
172	29705	assert(ctx->d->state < VHD_S__MAX);
173	29705	s = &vhd_states[ctx->d->state];
174	29705	i = ctx->d->integer;
175
176	29705	if (first) {
177	29393	INIT_OBJ(i, VHD_INT_MAGIC);
178	29393	i->pfx = s->arg1;
179	29393	assert(i->pfx >= 4 && i->pfx <= 7);
180	29393	}
181	29705	CHECK_OBJ_NOTNULL(i, VHD_INT_MAGIC);
182
183	30784	while (ctx->in < ctx->in_e) {
184	30472	c = *ctx->in;
185	30472	ctx->in++;
186	30472	if (i->pfx) {
187	29393	mask = (1U << i->pfx) - 1;
188	29393	i->pfx = 0;
189	29393	i->v = c & mask;
190	29393	if (i->v < mask) {
191	29042	vhd_next_state(ctx->d);
192	29042	return (VHD_AGAIN);
193		}
194	351	} else {
195	1079	if ((i->m == 28 && (c & 0x78)) \|\| i->m > 28)
196	78	return (VHD_ERR_INT);
197	1001	i->v += (c & 0x7f) * ((uint32_t)1 << i->m);
198	1001	i->m += 7;
199	1001	if (!(c & 0x80)) {
200	273	vhd_next_state(ctx->d);
201	273	return (VHD_AGAIN);
202		}
203		}
204		}
205	312	return (VHD_MORE);
206	29705	}
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	11193	vhd_set_idx(struct vhd_ctx *ctx, unsigned first)
224		{
225	11193	AN(ctx);
226	11193	AN(first);
227	11193	CHECK_OBJ_NOTNULL(ctx->d->integer, VHD_INT_MAGIC);
228	11193	ctx->d->index = ctx->d->integer->v;
229	11193	vhd_next_state(ctx->d);
230	11193	return (VHD_AGAIN);
231		}
232
233		static enum vhd_ret_e v_matchproto_(vhd_state_f)
234	22724	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	22724	AN(ctx);
242	22724	assert(ctx->d->state < VHD_S__MAX);
243	22724	s = &vhd_states[ctx->d->state];
244	22724	lu = ctx->d->lookup;
245
246	22724	if (first)
247	4992	INIT_OBJ(lu, VHD_LOOKUP_MAGIC);
248	22724	CHECK_OBJ_NOTNULL(lu, VHD_LOOKUP_MAGIC);
249
250	22724	switch (s->arg1) {
251		case VHD_NAME:
252		case VHD_NAME_SEC:
253	13468	p = VHT_LookupName(ctx->tbl, ctx->d->index, &l);
254	13468	break;
255		case VHD_VALUE:
256		case VHD_VALUE_SEC:
257	9256	p = VHT_LookupValue(ctx->tbl, ctx->d->index, &l);
258	9256	break;
259		default:
260	0	WRONG("vhd_lookup wrong arg1");
261	0	break;
262		}
263	22724	if (first && p == NULL)
264	0	return (VHD_ERR_IDX);
265	22724	AN(p);
266	22724	assert(l <= UINT_MAX);
267	22724	if (first)
268	4992	lu->l = l;
269
270	22724	assert(lu->l <= l);
271	22724	p += l - lu->l;
272	22724	l = vmin_t(size_t, lu->l, ctx->out_e - ctx->out);
273	22724	memcpy(ctx->out, p, l);
274	22724	ctx->out += l;
275	22724	lu->l -= l;
276
277	22724	if (lu->l == 0) {
278	4992	vhd_next_state(ctx->d);
279	4992	return (s->arg1);
280		}
281	17732	assert(ctx->out == ctx->out_e);
282	17732	return (VHD_BUF);
283	22724	}
284
285		static enum vhd_ret_e v_matchproto_(vhd_state_f)
286	169	vhd_new(struct vhd_ctx *ctx, unsigned first)
287		{
288	169	AN(ctx);
289	169	AN(first);
290	169	if (ctx->tbl != NULL)
291	117	VHT_NewEntry(ctx->tbl);
292	169	vhd_next_state(ctx->d);
293	169	return (VHD_AGAIN);
294		}
295
296		static enum vhd_ret_e v_matchproto_(vhd_state_f)
297	1079	vhd_new_idx(struct vhd_ctx *ctx, unsigned first)
298		{
299	1079	AN(ctx);
300	1079	AN(first);
301	1079	if (ctx->tbl != NULL) {
302	1079	if (VHT_NewEntry_Indexed(ctx->tbl, ctx->d->index))
303	0	return (VHD_ERR_IDX);
304	1079	}
305	1079	vhd_next_state(ctx->d);
306	1079	return (VHD_AGAIN);
307	1079	}
308
309		static enum vhd_ret_e v_matchproto_(vhd_state_f)
310	9269	vhd_branch_zidx(struct vhd_ctx *ctx, unsigned first)
311		{
312		const struct vhd_state *s;
313
314	9269	AN(ctx);
315	9269	(void)first;
316	9269	assert(ctx->d->state < VHD_S__MAX);
317	9269	s = &vhd_states[ctx->d->state];
318	9269	assert(s->arg1 < VHD_S__MAX);
319
320	9269	if (ctx->d->index == 0)
321	8125	vhd_set_state(ctx->d, s->arg1);
322		else
323	1144	vhd_next_state(ctx->d);
324	9269	return (VHD_AGAIN);
325		}
326
327		static enum vhd_ret_e v_matchproto_(vhd_state_f)
328	18070	vhd_branch_bit0(struct vhd_ctx *ctx, unsigned first)
329		{
330		const struct vhd_state *s;
331
332	18070	AN(ctx);
333	18070	(void)first;
334	18070	assert(ctx->d->state < VHD_S__MAX);
335	18070	s = &vhd_states[ctx->d->state];
336	18070	assert(s->arg1 < VHD_S__MAX);
337
338	18070	if (ctx->in == ctx->in_e)
339	104	return (VHD_MORE);
340
341	17966	if (*ctx->in & 0x80)
342	871	vhd_set_state(ctx->d, s->arg1);
343		else
344	17095	vhd_next_state(ctx->d);
345	17966	return (VHD_AGAIN);
346	18070	}
347
348		static enum vhd_ret_e v_matchproto_(vhd_state_f)
349	27534	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	27534	AN(ctx);
356	27534	assert(ctx->d->state < VHD_S__MAX);
357	27534	s = &vhd_states[ctx->d->state];
358
359	27534	raw = ctx->d->raw;
360	27534	if (first) {
361	17095	CHECK_OBJ_NOTNULL(ctx->d->integer, VHD_INT_MAGIC);
362	17095	l2 = ctx->d->integer->v;
363	17095	INIT_OBJ(raw, VHD_RAW_MAGIC);
364	17095	raw->l = l2;
365	17095	}
366	27534	CHECK_OBJ_NOTNULL(raw, VHD_RAW_MAGIC);
367
368	54327	while (raw->l > 0) {
369	37297	l2 = raw->l;
370	37297	if (l2 > (ctx->in_e - ctx->in))
371	13780	l2 = ctx->in_e - ctx->in;
372	37297	if (l2 == 0)
373	7215	return (VHD_MORE);
374	30082	if (l2 > (ctx->out_e - ctx->out))
375	6578	l2 = ctx->out_e - ctx->out;
376	30082	if (l2 == 0)
377	3289	return (VHD_BUF);
378	26793	memcpy(ctx->out, ctx->in, l2);
379	26793	ctx->in += l2;
380	26793	if (ctx->tbl != NULL && (s->arg2 & VHD_INCREMENTAL)) {
381	7943	switch (s->arg1) {
382		case VHD_NAME:
383	403	VHT_AppendName(ctx->tbl, ctx->out, l2);
384	403	break;
385		case VHD_VALUE:
386	7540	VHT_AppendValue(ctx->tbl, ctx->out, l2);
387	7540	break;
388		default:
389	0	WRONG("vhd_raw wrong arg1");
390	0	break;
391		}
392	7943	}
393	26793	ctx->out += l2;
394	26793	raw->l -= l2;
395		}
396	17030	vhd_next_state(ctx->d);
397	17030	return (s->arg1);
398	27534	}
399
400		static enum vhd_ret_e v_matchproto_(vhd_state_f)
401	8554	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	8554	AN(ctx);
409	8554	assert(ctx->d->state < VHD_S__MAX);
410	8554	s = &vhd_states[ctx->d->state];
411
412	8554	huf = ctx->d->huffman;
413	8554	if (first) {
414	871	CHECK_OBJ_NOTNULL(ctx->d->integer, VHD_INT_MAGIC);
415	871	l = ctx->d->integer->v;
416	871	INIT_OBJ(huf, VHD_HUFFMAN_MAGIC);
417	871	huf->len = l;
418	871	}
419	8554	CHECK_OBJ_NOTNULL(huf, VHD_HUFFMAN_MAGIC);
420
421	8554	r = VHD_OK;
422	8554	l = 0;
423	20514	while (1) {
424	20514	assert(huf->pos < HUFDEC_LEN);
425	20514	assert(hufdec[huf->pos].mask > 0);
426	20514	assert(hufdec[huf->pos].mask <= 8);
427
428	20514	if (huf->len > 0 && huf->blen < hufdec[huf->pos].mask) {
429		/* Refill from input */
430	12155	if (ctx->in == ctx->in_e) {
431	2964	r = VHD_MORE;
432	2964	break;
433		}
434	9191	huf->bits = (huf->bits << 8) \| *ctx->in;
435	9191	huf->blen += 8;
436	9191	huf->len--;
437	9191	ctx->in++;
438	9191	}
439
440	17550	if (huf->len == 0 && huf->pos == 0 && huf->blen <= 7 &&
441	1105	huf->bits == (1U << huf->blen) - 1U) {
442		/* End of stream */
443	715	r = s->arg1;
444	715	vhd_next_state(ctx->d);
445	715	break;
446		}
447
448	16835	if (ctx->out + l == ctx->out_e) {
449	4771	r = VHD_BUF;
450	4771	break;
451		}
452
453	12064	if (huf->blen >= hufdec[huf->pos].mask)
454	11752	u = huf->bits >> (huf->blen - hufdec[huf->pos].mask);
455		else
456	312	u = huf->bits << (hufdec[huf->pos].mask - huf->blen);
457	12064	huf->pos += u;
458	12064	assert(huf->pos < HUFDEC_LEN);
459
460	12064	if (hufdec[huf->pos].len == 0 \|\|
461	12012	hufdec[huf->pos].len > huf->blen) {
462		/* Invalid or incomplete code */
463	104	r = VHD_ERR_HUF;
464	104	break;
465		}
466
467	11960	huf->blen -= hufdec[huf->pos].len;
468	11960	huf->bits &= (1U << huf->blen) - 1U;
469
470	11960	if (hufdec[huf->pos].jump) {
471	468	huf->pos += hufdec[huf->pos].jump;
472	468	assert(huf->pos < HUFDEC_LEN);
473	468	} else {
474	11492	ctx->out[l++] = hufdec[huf->pos].chr;
475	11492	huf->pos = 0;
476		}
477		}
478
479	8554	if (l > 0 && ctx->tbl != NULL && (s->arg2 & VHD_INCREMENTAL)) {
480	7371	switch (s->arg1) {
481		case VHD_NAME:
482	390	VHT_AppendName(ctx->tbl, ctx->out, l);
483	390	break;
484		case VHD_VALUE:
485	6981	VHT_AppendValue(ctx->tbl, ctx->out, l);
486	6981	break;
487		default:
488	0	WRONG("vhd_raw wrong arg1");
489	0	break;
490		}
491	7371	}
492	8554	ctx->out += l;
493
494	8554	assert(r != VHD_OK);
495	8554	return (r);
496		}
497
498		/* Public interface */
499