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	24642	vhd_set_state(struct vhd_decode *d, enum vhd_state_e state)
94		{
95	24642	AN(d);
96	24642	assert(state > VHD_S__MIN && state < VHD_S__MAX);
97	24642	d->state = state;
98	24642	d->first = 1;
99	24642	}
100
101		static void
102	17200	vhd_next_state(struct vhd_decode *d)
103		{
104	17200	AN(d);
105	17200	assert(d->state + 1 < VHD_S__MAX);
106	17200	vhd_set_state(d, d->state + 1);
107	17200	}
108
109		/* State functions */
110		static enum vhd_ret_e v_matchproto_(vhd_state_f)
111	4472	vhd_skip(struct vhd_ctx *ctx, unsigned first)
112		{
113	4472	AN(ctx);
114	4472	AN(first);
115	4472	vhd_next_state(ctx->d);
116	4472	return (VHD_AGAIN);
117		}
118
119		static enum vhd_ret_e v_matchproto_(vhd_state_f)
120	4252	vhd_goto(struct vhd_ctx *ctx, unsigned first)
121		{
122		const struct vhd_state *s;
123
124	4252	AN(ctx);
125	4252	AN(first);
126	4252	assert(ctx->d->state < VHD_S__MAX);
127	4252	s = &vhd_states[ctx->d->state];
128	4252	assert(s->arg1 < VHD_S__MAX);
129	4252	vhd_set_state(ctx->d, s->arg1);
130	4252	return (VHD_AGAIN);
131		}
132
133		static enum vhd_ret_e v_matchproto_(vhd_state_f)
134	2224	vhd_idle(struct vhd_ctx *ctx, unsigned first)
135		{
136		uint8_t c;
137
138	2224	AN(ctx);
139	2224	(void)first;
140
141	2224	while (ctx->in < ctx->in_e) {
142	1726	c = *ctx->in;
143	1726	if ((c & 0x80) == 0x80)
144	300	vhd_set_state(ctx->d, VHD_S_HP61_START);
145	1426	else if ((c & 0xc0) == 0x40)
146	192	vhd_set_state(ctx->d, VHD_S_HP621_START);
147	1234	else if ((c & 0xf0) == 0x00)
148	1224	vhd_set_state(ctx->d, VHD_S_HP622_START);
149	10	else if ((c & 0xf0) == 0x10)
150	10	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	1726	return (VHD_AGAIN);
156		}
157
158	498	return (VHD_OK);
159	2224	}
160
161		static enum vhd_ret_e v_matchproto_(vhd_state_f)
162	4570	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	4570	assert(UINT_MAX >= UINT32_MAX);
170
171	4570	AN(ctx);
172	4570	assert(ctx->d->state < VHD_S__MAX);
173	4570	s = &vhd_states[ctx->d->state];
174	4570	i = ctx->d->integer;
175
176	4570	if (first) {
177	4522	INIT_OBJ(i, VHD_INT_MAGIC);
178	4522	i->pfx = s->arg1;
179	4522	assert(i->pfx >= 4 && i->pfx <= 7);
180	4522	}
181	4570	CHECK_OBJ_NOTNULL(i, VHD_INT_MAGIC);
182
183	4736	while (ctx->in < ctx->in_e) {
184	4688	c = *ctx->in;
185	4688	ctx->in++;
186	4688	if (i->pfx) {
187	4522	mask = (1U << i->pfx) - 1;
188	4522	i->pfx = 0;
189	4522	i->v = c & mask;
190	4522	if (i->v < mask) {
191	4468	vhd_next_state(ctx->d);
192	4468	return (VHD_AGAIN);
193		}
194	54	} else {
195	166	if ((i->m == 28 && (c & 0x78)) \|\| i->m > 28)
196	12	return (VHD_ERR_INT);
197	154	i->v += (c & 0x7f) * ((uint32_t)1 << i->m);
198	154	i->m += 7;
199	154	if (!(c & 0x80)) {
200	42	vhd_next_state(ctx->d);
201	42	return (VHD_AGAIN);
202		}
203		}
204		}
205	48	return (VHD_MORE);
206	4570	}
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	1722	vhd_set_idx(struct vhd_ctx *ctx, unsigned first)
224		{
225	1722	AN(ctx);
226	1722	AN(first);
227	1722	CHECK_OBJ_NOTNULL(ctx->d->integer, VHD_INT_MAGIC);
228	1722	ctx->d->index = ctx->d->integer->v;
229	1722	vhd_next_state(ctx->d);
230	1722	return (VHD_AGAIN);
231		}
232
233		static enum vhd_ret_e v_matchproto_(vhd_state_f)
234	3496	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	3496	AN(ctx);
242	3496	assert(ctx->d->state < VHD_S__MAX);
243	3496	s = &vhd_states[ctx->d->state];
244	3496	lu = ctx->d->lookup;
245
246	3496	if (first)
247	768	INIT_OBJ(lu, VHD_LOOKUP_MAGIC);
248	3496	CHECK_OBJ_NOTNULL(lu, VHD_LOOKUP_MAGIC);
249
250	3496	switch (s->arg1) {
251		case VHD_NAME:
252		case VHD_NAME_SEC:
253	2072	p = VHT_LookupName(ctx->tbl, ctx->d->index, &l);
254	2072	break;
255		case VHD_VALUE:
256		case VHD_VALUE_SEC:
257	1424	p = VHT_LookupValue(ctx->tbl, ctx->d->index, &l);
258	1424	break;
259		default:
260	0	WRONG("vhd_lookup wrong arg1");
261	0	break;
262		}
263	3496	if (first && p == NULL)
264	0	return (VHD_ERR_IDX);
265	3496	AN(p);
266	3496	assert(l <= UINT_MAX);
267	3496	if (first)
268	768	lu->l = l;
269
270	3496	assert(lu->l <= l);
271	3496	p += l - lu->l;
272	3496	l = vmin_t(size_t, lu->l, ctx->out_e - ctx->out);
273	3496	memcpy(ctx->out, p, l);
274	3496	ctx->out += l;
275	3496	lu->l -= l;
276
277	3496	if (lu->l == 0) {
278	768	vhd_next_state(ctx->d);
279	768	return (s->arg1);
280		}
281	2728	assert(ctx->out == ctx->out_e);
282	2728	return (VHD_BUF);
283	3496	}
284
285		static enum vhd_ret_e v_matchproto_(vhd_state_f)
286	26	vhd_new(struct vhd_ctx *ctx, unsigned first)
287		{
288	26	AN(ctx);
289	26	AN(first);
290	26	if (ctx->tbl != NULL)
291	18	VHT_NewEntry(ctx->tbl);
292	26	vhd_next_state(ctx->d);
293	26	return (VHD_AGAIN);
294		}
295
296		static enum vhd_ret_e v_matchproto_(vhd_state_f)
297	166	vhd_new_idx(struct vhd_ctx *ctx, unsigned first)
298		{
299	166	AN(ctx);
300	166	AN(first);
301	166	if (ctx->tbl != NULL) {
302	166	if (VHT_NewEntry_Indexed(ctx->tbl, ctx->d->index))
303	0	return (VHD_ERR_IDX);
304	166	}
305	166	vhd_next_state(ctx->d);
306	166	return (VHD_AGAIN);
307	166	}
308
309		static enum vhd_ret_e v_matchproto_(vhd_state_f)
310	1426	vhd_branch_zidx(struct vhd_ctx *ctx, unsigned first)
311		{
312		const struct vhd_state *s;
313
314	1426	AN(ctx);
315	1426	(void)first;
316	1426	assert(ctx->d->state < VHD_S__MAX);
317	1426	s = &vhd_states[ctx->d->state];
318	1426	assert(s->arg1 < VHD_S__MAX);
319
320	1426	if (ctx->d->index == 0)
321	1250	vhd_set_state(ctx->d, s->arg1);
322		else
323	176	vhd_next_state(ctx->d);
324	1426	return (VHD_AGAIN);
325		}
326
327		static enum vhd_ret_e v_matchproto_(vhd_state_f)
328	2780	vhd_branch_bit0(struct vhd_ctx *ctx, unsigned first)
329		{
330		const struct vhd_state *s;
331
332	2780	AN(ctx);
333	2780	(void)first;
334	2780	assert(ctx->d->state < VHD_S__MAX);
335	2780	s = &vhd_states[ctx->d->state];
336	2780	assert(s->arg1 < VHD_S__MAX);
337
338	2780	if (ctx->in == ctx->in_e)
339	16	return (VHD_MORE);
340
341	2764	if (*ctx->in & 0x80)
342	134	vhd_set_state(ctx->d, s->arg1);
343		else
344	2630	vhd_next_state(ctx->d);
345	2764	return (VHD_AGAIN);
346	2780	}
347
348		static enum vhd_ret_e v_matchproto_(vhd_state_f)
349	4236	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	4236	AN(ctx);
356	4236	assert(ctx->d->state < VHD_S__MAX);
357	4236	s = &vhd_states[ctx->d->state];
358
359	4236	raw = ctx->d->raw;
360	4236	if (first) {
361	2630	CHECK_OBJ_NOTNULL(ctx->d->integer, VHD_INT_MAGIC);
362	2630	l2 = ctx->d->integer->v;
363	2630	INIT_OBJ(raw, VHD_RAW_MAGIC);
364	2630	raw->l = l2;
365	2630	}
366	4236	CHECK_OBJ_NOTNULL(raw, VHD_RAW_MAGIC);
367
368	8358	while (raw->l > 0) {
369	5738	l2 = raw->l;
370	5738	if (l2 > (ctx->in_e - ctx->in))
371	2120	l2 = ctx->in_e - ctx->in;
372	5738	if (l2 == 0)
373	1110	return (VHD_MORE);
374	4628	if (l2 > (ctx->out_e - ctx->out))
375	1012	l2 = ctx->out_e - ctx->out;
376	4628	if (l2 == 0)
377	506	return (VHD_BUF);
378	4122	memcpy(ctx->out, ctx->in, l2);
379	4122	ctx->in += l2;
380	4122	if (ctx->tbl != NULL && (s->arg2 & VHD_INCREMENTAL)) {
381	1222	switch (s->arg1) {
382		case VHD_NAME:
383	62	VHT_AppendName(ctx->tbl, ctx->out, l2);
384	62	break;
385		case VHD_VALUE:
386	1160	VHT_AppendValue(ctx->tbl, ctx->out, l2);
387	1160	break;
388		default:
389	0	WRONG("vhd_raw wrong arg1");
390	0	break;
391		}
392	1222	}
393	4122	ctx->out += l2;
394	4122	raw->l -= l2;
395		}
396	2620	vhd_next_state(ctx->d);
397	2620	return (s->arg1);
398	4236	}
399
400		static enum vhd_ret_e v_matchproto_(vhd_state_f)
401	1316	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	1316	AN(ctx);
409	1316	assert(ctx->d->state < VHD_S__MAX);
410	1316	s = &vhd_states[ctx->d->state];
411
412	1316	huf = ctx->d->huffman;
413	1316	if (first) {
414	134	CHECK_OBJ_NOTNULL(ctx->d->integer, VHD_INT_MAGIC);
415	134	l = ctx->d->integer->v;
416	134	INIT_OBJ(huf, VHD_HUFFMAN_MAGIC);
417	134	huf->len = l;
418	134	}
419	1316	CHECK_OBJ_NOTNULL(huf, VHD_HUFFMAN_MAGIC);
420
421	1316	r = VHD_OK;
422	1316	l = 0;
423	3156	while (1) {
424	3156	assert(huf->pos < HUFDEC_LEN);
425	3156	assert(hufdec[huf->pos].mask > 0);
426	3156	assert(hufdec[huf->pos].mask <= 8);
427
428	3156	if (huf->len > 0 && huf->blen < hufdec[huf->pos].mask) {
429		/* Refill from input */
430	1870	if (ctx->in == ctx->in_e) {
431	456	r = VHD_MORE;
432	456	break;
433		}
434	1414	huf->bits = (huf->bits << 8) \| *ctx->in;
435	1414	huf->blen += 8;
436	1414	huf->len--;
437	1414	ctx->in++;
438	1414	}
439
440	2700	if (huf->len == 0 && huf->pos == 0 && huf->blen <= 7 &&
441	170	huf->bits == (1U << huf->blen) - 1U) {
442		/* End of stream */
443	110	r = s->arg1;
444	110	vhd_next_state(ctx->d);
445	110	break;
446		}
447
448	2590	if (ctx->out + l == ctx->out_e) {
449	734	r = VHD_BUF;
450	734	break;
451		}
452
453	1856	if (huf->blen >= hufdec[huf->pos].mask)
454	1808	u = huf->bits >> (huf->blen - hufdec[huf->pos].mask);
455		else
456	48	u = huf->bits << (hufdec[huf->pos].mask - huf->blen);
457	1856	huf->pos += u;
458	1856	assert(huf->pos < HUFDEC_LEN);
459
460	1856	if (hufdec[huf->pos].len == 0 \|\|
461	1848	hufdec[huf->pos].len > huf->blen) {
462		/* Invalid or incomplete code */
463	16	r = VHD_ERR_HUF;
464	16	break;
465		}
466
467	1840	huf->blen -= hufdec[huf->pos].len;
468	1840	huf->bits &= (1U << huf->blen) - 1U;
469
470	1840	if (hufdec[huf->pos].jump) {
471	72	huf->pos += hufdec[huf->pos].jump;
472	72	assert(huf->pos < HUFDEC_LEN);
473	72	} else {
474	1768	ctx->out[l++] = hufdec[huf->pos].chr;
475	1768	huf->pos = 0;
476		}
477		}
478
479	1316	if (l > 0 && ctx->tbl != NULL && (s->arg2 & VHD_INCREMENTAL)) {
480	1134	switch (s->arg1) {
481		case VHD_NAME:
482	60	VHT_AppendName(ctx->tbl, ctx->out, l);
483	60	break;
484		case VHD_VALUE:
485	1074	VHT_AppendValue(ctx->tbl, ctx->out, l);
486	1074	break;
487		default:
488	0	WRONG("vhd_raw wrong arg1");
489	0	break;
490		}
491	1134	}
492	1316	ctx->out += l;
493
494	1316	assert(r != VHD_OK);
495	1316	return (r);
496		}
497
498		/* Public interface */
499