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	98568	vhd_set_state(struct vhd_decode *d, enum vhd_state_e state)
94		{
95	98568	AN(d);
96	98568	assert(state > VHD_S__MIN && state < VHD_S__MAX);
97	98568	d->state = state;
98	98568	d->first = 1;
99	98568	}
100
101		static void
102	68800	vhd_next_state(struct vhd_decode *d)
103		{
104	68800	AN(d);
105	68800	assert(d->state + 1 < VHD_S__MAX);
106	68800	vhd_set_state(d, d->state + 1);
107	68800	}
108
109		/* State functions */
110		static enum vhd_ret_e v_matchproto_(vhd_state_f)
111	17888	vhd_skip(struct vhd_ctx *ctx, unsigned first)
112		{
113	17888	AN(ctx);
114	17888	AN(first);
115	17888	vhd_next_state(ctx->d);
116	17888	return (VHD_AGAIN);
117		}
118
119		static enum vhd_ret_e v_matchproto_(vhd_state_f)
120	17008	vhd_goto(struct vhd_ctx *ctx, unsigned first)
121		{
122		const struct vhd_state *s;
123
124	17008	AN(ctx);
125	17008	AN(first);
126	17008	assert(ctx->d->state < VHD_S__MAX);
127	17008	s = &vhd_states[ctx->d->state];
128	17008	assert(s->arg1 < VHD_S__MAX);
129	17008	vhd_set_state(ctx->d, s->arg1);
130	17008	return (VHD_AGAIN);
131		}
132
133		static enum vhd_ret_e v_matchproto_(vhd_state_f)
134	8896	vhd_idle(struct vhd_ctx *ctx, unsigned first)
135		{
136		uint8_t c;
137
138	8896	AN(ctx);
139	8896	(void)first;
140
141	8896	while (ctx->in < ctx->in_e) {
142	6904	c = *ctx->in;
143	6904	if ((c & 0x80) == 0x80)
144	1200	vhd_set_state(ctx->d, VHD_S_HP61_START);
145	5704	else if ((c & 0xc0) == 0x40)
146	768	vhd_set_state(ctx->d, VHD_S_HP621_START);
147	4936	else if ((c & 0xf0) == 0x00)
148	4896	vhd_set_state(ctx->d, VHD_S_HP622_START);
149	40	else if ((c & 0xf0) == 0x10)
150	40	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	6904	return (VHD_AGAIN);
156		}
157
158	1992	return (VHD_OK);
159	8896	}
160
161		static enum vhd_ret_e v_matchproto_(vhd_state_f)
162	18280	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	18280	assert(UINT_MAX >= UINT32_MAX);
170
171	18280	AN(ctx);
172	18280	assert(ctx->d->state < VHD_S__MAX);
173	18280	s = &vhd_states[ctx->d->state];
174	18280	i = ctx->d->integer;
175
176	18280	if (first) {
177	18088	INIT_OBJ(i, VHD_INT_MAGIC);
178	18088	i->pfx = s->arg1;
179	18088	assert(i->pfx >= 4 && i->pfx <= 7);
180	18088	}
181	18280	CHECK_OBJ_NOTNULL(i, VHD_INT_MAGIC);
182
183	18944	while (ctx->in < ctx->in_e) {
184	18752	c = *ctx->in;
185	18752	ctx->in++;
186	18752	if (i->pfx) {
187	18088	mask = (1U << i->pfx) - 1;
188	18088	i->pfx = 0;
189	18088	i->v = c & mask;
190	18088	if (i->v < mask) {
191	17872	vhd_next_state(ctx->d);
192	17872	return (VHD_AGAIN);
193		}
194	216	} else {
195	664	if ((i->m == 28 && (c & 0x78)) \|\| i->m > 28)
196	48	return (VHD_ERR_INT);
197	616	i->v += (c & 0x7f) * ((uint32_t)1 << i->m);
198	616	i->m += 7;
199	616	if (!(c & 0x80)) {
200	168	vhd_next_state(ctx->d);
201	168	return (VHD_AGAIN);
202		}
203		}
204		}
205	192	return (VHD_MORE);
206	18280	}
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	6888	vhd_set_idx(struct vhd_ctx *ctx, unsigned first)
224		{
225	6888	AN(ctx);
226	6888	AN(first);
227	6888	CHECK_OBJ_NOTNULL(ctx->d->integer, VHD_INT_MAGIC);
228	6888	ctx->d->index = ctx->d->integer->v;
229	6888	vhd_next_state(ctx->d);
230	6888	return (VHD_AGAIN);
231		}
232
233		static enum vhd_ret_e v_matchproto_(vhd_state_f)
234	13984	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	13984	AN(ctx);
242	13984	assert(ctx->d->state < VHD_S__MAX);
243	13984	s = &vhd_states[ctx->d->state];
244	13984	lu = ctx->d->lookup;
245
246	13984	if (first)
247	3072	INIT_OBJ(lu, VHD_LOOKUP_MAGIC);
248	13984	CHECK_OBJ_NOTNULL(lu, VHD_LOOKUP_MAGIC);
249
250	13984	switch (s->arg1) {
251		case VHD_NAME:
252		case VHD_NAME_SEC:
253	8288	p = VHT_LookupName(ctx->tbl, ctx->d->index, &l);
254	8288	break;
255		case VHD_VALUE:
256		case VHD_VALUE_SEC:
257	5696	p = VHT_LookupValue(ctx->tbl, ctx->d->index, &l);
258	5696	break;
259		default:
260	0	WRONG("vhd_lookup wrong arg1");
261	0	break;
262		}
263	13984	if (first && p == NULL)
264	0	return (VHD_ERR_IDX);
265	13984	AN(p);
266	13984	assert(l <= UINT_MAX);
267	13984	if (first)
268	3072	lu->l = l;
269
270	13984	assert(lu->l <= l);
271	13984	p += l - lu->l;
272	13984	l = vmin_t(size_t, lu->l, ctx->out_e - ctx->out);
273	13984	memcpy(ctx->out, p, l);
274	13984	ctx->out += l;
275	13984	lu->l -= l;
276
277	13984	if (lu->l == 0) {
278	3072	vhd_next_state(ctx->d);
279	3072	return (s->arg1);
280		}
281	10912	assert(ctx->out == ctx->out_e);
282	10912	return (VHD_BUF);
283	13984	}
284
285		static enum vhd_ret_e v_matchproto_(vhd_state_f)
286	104	vhd_new(struct vhd_ctx *ctx, unsigned first)
287		{
288	104	AN(ctx);
289	104	AN(first);
290	104	if (ctx->tbl != NULL)
291	72	VHT_NewEntry(ctx->tbl);
292	104	vhd_next_state(ctx->d);
293	104	return (VHD_AGAIN);
294		}
295
296		static enum vhd_ret_e v_matchproto_(vhd_state_f)
297	664	vhd_new_idx(struct vhd_ctx *ctx, unsigned first)
298		{
299	664	AN(ctx);
300	664	AN(first);
301	664	if (ctx->tbl != NULL) {
302	664	if (VHT_NewEntry_Indexed(ctx->tbl, ctx->d->index))
303	0	return (VHD_ERR_IDX);
304	664	}
305	664	vhd_next_state(ctx->d);
306	664	return (VHD_AGAIN);
307	664	}
308
309		static enum vhd_ret_e v_matchproto_(vhd_state_f)
310	5704	vhd_branch_zidx(struct vhd_ctx *ctx, unsigned first)
311		{
312		const struct vhd_state *s;
313
314	5704	AN(ctx);
315	5704	(void)first;
316	5704	assert(ctx->d->state < VHD_S__MAX);
317	5704	s = &vhd_states[ctx->d->state];
318	5704	assert(s->arg1 < VHD_S__MAX);
319
320	5704	if (ctx->d->index == 0)
321	5000	vhd_set_state(ctx->d, s->arg1);
322		else
323	704	vhd_next_state(ctx->d);
324	5704	return (VHD_AGAIN);
325		}
326
327		static enum vhd_ret_e v_matchproto_(vhd_state_f)
328	11120	vhd_branch_bit0(struct vhd_ctx *ctx, unsigned first)
329		{
330		const struct vhd_state *s;
331
332	11120	AN(ctx);
333	11120	(void)first;
334	11120	assert(ctx->d->state < VHD_S__MAX);
335	11120	s = &vhd_states[ctx->d->state];
336	11120	assert(s->arg1 < VHD_S__MAX);
337
338	11120	if (ctx->in == ctx->in_e)
339	64	return (VHD_MORE);
340
341	11056	if (*ctx->in & 0x80)
342	536	vhd_set_state(ctx->d, s->arg1);
343		else
344	10520	vhd_next_state(ctx->d);
345	11056	return (VHD_AGAIN);
346	11120	}
347
348		static enum vhd_ret_e v_matchproto_(vhd_state_f)
349	16944	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	16944	AN(ctx);
356	16944	assert(ctx->d->state < VHD_S__MAX);
357	16944	s = &vhd_states[ctx->d->state];
358
359	16944	raw = ctx->d->raw;
360	16944	if (first) {
361	10520	CHECK_OBJ_NOTNULL(ctx->d->integer, VHD_INT_MAGIC);
362	10520	l2 = ctx->d->integer->v;
363	10520	INIT_OBJ(raw, VHD_RAW_MAGIC);
364	10520	raw->l = l2;
365	10520	}
366	16944	CHECK_OBJ_NOTNULL(raw, VHD_RAW_MAGIC);
367
368	33432	while (raw->l > 0) {
369	22952	l2 = raw->l;
370	22952	if (l2 > (ctx->in_e - ctx->in))
371	8480	l2 = ctx->in_e - ctx->in;
372	22952	if (l2 == 0)
373	4440	return (VHD_MORE);
374	18512	if (l2 > (ctx->out_e - ctx->out))
375	4048	l2 = ctx->out_e - ctx->out;
376	18512	if (l2 == 0)
377	2024	return (VHD_BUF);
378	16488	memcpy(ctx->out, ctx->in, l2);
379	16488	ctx->in += l2;
380	16488	if (ctx->tbl != NULL && (s->arg2 & VHD_INCREMENTAL)) {
381	4888	switch (s->arg1) {
382		case VHD_NAME:
383	248	VHT_AppendName(ctx->tbl, ctx->out, l2);
384	248	break;
385		case VHD_VALUE:
386	4640	VHT_AppendValue(ctx->tbl, ctx->out, l2);
387	4640	break;
388		default:
389	0	WRONG("vhd_raw wrong arg1");
390	0	break;
391		}
392	4888	}
393	16488	ctx->out += l2;
394	16488	raw->l -= l2;
395		}
396	10480	vhd_next_state(ctx->d);
397	10480	return (s->arg1);
398	16944	}
399
400		static enum vhd_ret_e v_matchproto_(vhd_state_f)
401	5264	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	5264	AN(ctx);
409	5264	assert(ctx->d->state < VHD_S__MAX);
410	5264	s = &vhd_states[ctx->d->state];
411
412	5264	huf = ctx->d->huffman;
413	5264	if (first) {
414	536	CHECK_OBJ_NOTNULL(ctx->d->integer, VHD_INT_MAGIC);
415	536	l = ctx->d->integer->v;
416	536	INIT_OBJ(huf, VHD_HUFFMAN_MAGIC);
417	536	huf->len = l;
418	536	}
419	5264	CHECK_OBJ_NOTNULL(huf, VHD_HUFFMAN_MAGIC);
420
421	5264	r = VHD_OK;
422	5264	l = 0;
423	12624	while (1) {
424	12624	assert(huf->pos < HUFDEC_LEN);
425	12624	assert(hufdec[huf->pos].mask > 0);
426	12624	assert(hufdec[huf->pos].mask <= 8);
427
428	12624	if (huf->len > 0 && huf->blen < hufdec[huf->pos].mask) {
429		/* Refill from input */
430	7480	if (ctx->in == ctx->in_e) {
431	1824	r = VHD_MORE;
432	1824	break;
433		}
434	5656	huf->bits = (huf->bits << 8) \| *ctx->in;
435	5656	huf->blen += 8;
436	5656	huf->len--;
437	5656	ctx->in++;
438	5656	}
439
440	10800	if (huf->len == 0 && huf->pos == 0 && huf->blen <= 7 &&
441	680	huf->bits == (1U << huf->blen) - 1U) {
442		/* End of stream */
443	440	r = s->arg1;
444	440	vhd_next_state(ctx->d);
445	440	break;
446		}
447
448	10360	if (ctx->out + l == ctx->out_e) {
449	2936	r = VHD_BUF;
450	2936	break;
451		}
452
453	7424	if (huf->blen >= hufdec[huf->pos].mask)
454	7232	u = huf->bits >> (huf->blen - hufdec[huf->pos].mask);
455		else
456	192	u = huf->bits << (hufdec[huf->pos].mask - huf->blen);
457	7424	huf->pos += u;
458	7424	assert(huf->pos < HUFDEC_LEN);
459
460	7424	if (hufdec[huf->pos].len == 0 \|\|
461	7392	hufdec[huf->pos].len > huf->blen) {
462		/* Invalid or incomplete code */
463	64	r = VHD_ERR_HUF;
464	64	break;
465		}
466
467	7360	huf->blen -= hufdec[huf->pos].len;
468	7360	huf->bits &= (1U << huf->blen) - 1U;
469
470	7360	if (hufdec[huf->pos].jump) {
471	288	huf->pos += hufdec[huf->pos].jump;
472	288	assert(huf->pos < HUFDEC_LEN);
473	288	} else {
474	7072	ctx->out[l++] = hufdec[huf->pos].chr;
475	7072	huf->pos = 0;
476		}
477		}
478
479	5264	if (l > 0 && ctx->tbl != NULL && (s->arg2 & VHD_INCREMENTAL)) {
480	4536	switch (s->arg1) {
481		case VHD_NAME:
482	240	VHT_AppendName(ctx->tbl, ctx->out, l);
483	240	break;
484		case VHD_VALUE:
485	4296	VHT_AppendValue(ctx->tbl, ctx->out, l);
486	4296	break;
487		default:
488	0	WRONG("vhd_raw wrong arg1");
489	0	break;
490		}
491	4536	}
492	5264	ctx->out += l;
493
494	5264	assert(r != VHD_OK);
495	5264	return (r);
496		}
497
498		/* Public interface */
499