GCOV - Varnish Cache


/*-
 * Copyright (c) 2008-2016 Varnish Software AS
 * All rights reserved.
 *
 * Author: Guillaume Quintard <guillaume.quintard@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 <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>


#include "vdef.h"

#include "vas.h"
#include "vqueue.h"

#include "hpack.h"
#include "vtc_h2_priv.h"

struct symbol {
        uint32_t        val;
        uint8_t         size;
};

static const struct symbol coding_table[] = {
#define HPACK(i, v, l) {v, l},
#include "vtc_h2_enctbl.h"
#undef HPACK
        {0, 0}
};

#include "vtc_h2_dectbl.h"

#define MASK(pack, n) (pack >> (64 - n))
static int
huff_decode(char *str, int nm, struct hpk_iter *iter, int ilen)
{
        int l = 0;
        uint64_t pack = 0;
        unsigned pl = 0; /* pack length*/
        struct stbl *tbl = &tbl_0;
        struct ssym *sym;

        (void)nm;
        while (ilen > 0 || pl != 0) {
                /* make sure we have enough data*/
                if (pl < tbl->msk) {
                        if (ilen == 0) {
                                if (pl == 0 || (MASK(pack, pl) ==
                                                (unsigned)((1U << pl) - 1U))) {
                                        assert(tbl == &tbl_0);
                                        return (l);
                                }
                        }
                        /* fit as many bytes as we can in pack */
                        while (pl <= 56 && ilen > 0) {
                                pack |= (uint64_t)(*iter->buf & 0xff)
                                        << (56 - pl);
                                pl += 8;
                                iter->buf++;
                                ilen--;
                        }
                }
                assert(tbl);
                assert(tbl->msk);
                sym = &tbl->syms[MASK(pack, tbl->msk)];

                assert(sym->csm <= tbl->msk);

                if (sym->csm == 0 || pl < sym->csm)
                        return (0);

                assert(sym->csm <= 8);
                pack <<= sym->csm;
                assert(sym->csm <= pl);
                pl -= sym->csm;
                if (sym->nxt) {
                        tbl = sym->nxt;
                        continue;
                }
                str[l++] = sym->chr;
                tbl = &tbl_0;
        }
        return (l);
}

/* inspired from Dridi Boukelmoune's cashpack. */
static enum hpk_result
huff_encode(struct hpk_iter *iter, const char *str, int len)
{
        uint64_t pack = 0;
        int pl = 0; /* pack length*/
        uint32_t        v;
        uint8_t         s;

        assert(iter->buf < iter->end);

        while (len--) {
                v = coding_table[(uint8_t)*str].val;
                s = coding_table[(uint8_t)*str].size;

                pl += s;
                pack |= (uint64_t)v << (64 - pl);

                while (pl >= 8) {
                        if (iter->buf == iter->end)
                                return (hpk_done);
                        *iter->buf = (char)(pack >> 56);
                        iter->buf++;
                        pack <<= 8;
                        pl -= 8;
                }
                str++;
        }

        /* padding */
        if (pl) {
                assert(pl < 8);
                if (iter->buf == iter->end)
                        return (hpk_done);
                pl += 8;
                pack |= (uint64_t)0xff << (64 - pl);
                *iter->buf = (char)(pack >> 56);
                iter->buf++;
        }

        return (hpk_more);
}

static int
huff_simulate(const char *str, int ilen, int huff)
{
        int olen = 0;
        if (!huff || !ilen)
                return (ilen);
        while (ilen--) {
                olen += coding_table[(unsigned char)*str].size;
                str++;
        }
        return ((olen + 7) / 8);
}

static enum hpk_result
num_decode(uint32_t *result, struct hpk_iter *iter, uint8_t prefix)
{
        uint8_t shift = 0;

        assert(iter->buf < iter->end);
        assert(prefix);
        assert(prefix <= 8);

        *result = 0;
        *result = *iter->buf & (0xff >> (8-prefix));
        if (*result < (1U << prefix) - 1U) {
                iter->buf++;
                return (ITER_DONE(iter));
        }
        do {
                iter->buf++;
                if (iter->end == iter->buf)
                        return (hpk_err);
                /* check for overflow */
                if ((UINT32_MAX - *result) >> shift < (*iter->buf & 0x7f))
                        return (hpk_err);

                *result += (uint32_t)(*iter->buf & 0x7f) << shift;
                shift += 7;
        } while (*iter->buf & 0x80);
        iter->buf++;

        return (ITER_DONE(iter));
}

static enum hpk_result
num_encode(struct hpk_iter *iter, uint8_t prefix, uint32_t num)
{
        assert(prefix);
        assert(prefix <= 8);
        assert(iter->buf < iter->end);

        uint8_t pmax = (1U << prefix) - 1U;

        *iter->buf &= 0xffU << prefix;
        if (num <= pmax) {
                *iter->buf++ |= num;
                return (ITER_DONE(iter));
        } else if (iter->end - iter->buf < 2)
                return (hpk_err);

        iter->buf[0] |= pmax;
        num -= pmax;
        do {
                iter->buf++;
                if (iter->end == iter->buf)
                        return (hpk_err);
                *iter->buf = num % 128;
                *iter->buf |= 0x80;
                num /= 128;
        } while (num);
        *iter->buf++ &= 127;
        return (ITER_DONE(iter));
}

static enum hpk_result
str_encode(struct hpk_iter *iter, const struct hpk_txt *t)
{
        int slen = huff_simulate(t->ptr, t->len, t->huff);
        assert(iter->buf < iter->end);
        if (t->huff)
                *iter->buf = 0x80;
        else
                *iter->buf = 0;

        if (hpk_err == num_encode(iter, 7, slen))
                return (hpk_err);

        if (slen > iter->end - iter->buf)
                return (hpk_err);

        if (t->huff) {
                return (huff_encode(iter, t->ptr, t->len));
        } else {
                memcpy(iter->buf, t->ptr, slen);
                iter->buf += slen;
                return (ITER_DONE(iter));
        }
}

static enum hpk_result
str_decode(struct hpk_iter *iter, struct hpk_txt *t)
{
        uint32_t num;
        int huff;

        assert(iter->buf < iter->end);

        huff = (*iter->buf & 0x80);
        if (hpk_more != num_decode(&num, iter, 7))
                return (hpk_err);
        assert(iter->buf < iter->end);
        if (num > (unsigned)(iter->end - iter->buf))
                return (hpk_err);
        if (huff) { /*Huffman encoding */
                t->ptr = malloc((num * 8L) / 5L + 1L);
                AN(t->ptr);
                num = huff_decode(t->ptr, (num * 8) / 5, iter, num);
                if (!num) {
                        free(t->ptr);
                        return (hpk_err);
                }
                t->huff = 1;
                /* XXX: do we care? */
                t->ptr = realloc(t->ptr, num + 1L);
                AN(t->ptr);
        } else { /* literal string */
                t->huff = 0;
                t->ptr = malloc(num + 1L);
                AN(t->ptr);
                memcpy(t->ptr, iter->buf, num);
                iter->buf += num;
        }

        t->ptr[num] = '\0';
        t->len = num;

        return (ITER_DONE(iter));
}

static inline void
txtcpy(struct hpk_txt *to, const struct hpk_txt *from)
{
        //AZ(to->ptr);
        to->ptr = malloc(from->len + 1L);
        AN(to->ptr);
        memcpy(to->ptr, from->ptr, from->len + 1L);
        to->len = from->len;
}

int
gethpk_iterLen(const struct hpk_iter *iter)
{
        return (iter->buf - iter->orig);
}

enum hpk_result
HPK_DecHdr(struct hpk_iter *iter, struct hpk_hdr *header)
{
        int pref = 0;
        const struct hpk_txt *t;
        uint32_t num;
        int must_index = 0;
        assert(iter);
        assert(iter->buf < iter->end);
        /* Indexed Header Field */
        if (*iter->buf & 128) {
                header->t = hpk_idx;
                if (hpk_err == num_decode(&num, iter, 7))
                        return (hpk_err);

                if (num) { /* indexed key and value*/
                        t = tbl_get_key(iter->ctx, num);
                        if (!t)
                                return (hpk_err);
                        txtcpy(&header->key, t);

                        t = tbl_get_value(iter->ctx, num);
                        if (!t) {
                                free(header->key.ptr);
                                return (hpk_err);
                        }

                        txtcpy(&header->value, t);

                        if (iter->buf < iter->end)
                                return (hpk_more);
                        else
                                return (hpk_done);
                } else
                        return (hpk_err);

        }
        /* Literal Header Field with Incremental Indexing */
        else if (*iter->buf >> 6 == 1) {
                header->t = hpk_inc;
                pref = 6;
                must_index = 1;
        }
        /* Literal Header Field without Indexing */
        else if (*iter->buf >> 4 == 0) {
                header->t = hpk_not;
                pref = 4;
        }
        /* Literal Header Field never Indexed */
        else if (*iter->buf >> 4 == 1) {
                header->t = hpk_never;
                pref = 4;
        }
        /* Dynamic Table Size Update */
        /* XXX if under max allowed value */
        else if (*iter->buf >> 5 == 1) {
                if (hpk_done != num_decode(&num, iter, 5))
                        return (hpk_err);
                return (HPK_ResizeTbl(iter->ctx, num));
        } else {
                return (hpk_err);
        }

        assert(pref);
        if (hpk_more != num_decode(&num, iter, pref))
                return (hpk_err);

        header->i = num;
        if (num) { /* indexed key */
                t = tbl_get_key(iter->ctx, num);
                if (!t)
                        return (hpk_err);
                txtcpy(&header->key, t);
        } else {
                if (hpk_more != str_decode(iter, &header->key)) {
                        free(header->key.ptr);
                        return (hpk_err);
                }
        }

        if (hpk_err == str_decode(iter, &header->value)) {
                free(header->key.ptr);
                return (hpk_err);
        }

        if (must_index)
                push_header(iter->ctx, header);
        return (ITER_DONE(iter));
}

enum hpk_result
HPK_EncHdr(struct hpk_iter *iter, const struct hpk_hdr *h)
{
        int pref;
        int must_index = 0;
        enum hpk_result ret;
        switch (h->t) {
                case hpk_idx:
                        *iter->buf = 0x80;
                        assert(num_encode(iter, 7, h->i) != hpk_err);
                        return (ITER_DONE(iter));
                case hpk_inc:
                        *iter->buf = 0x40;
                        pref = 6;
                        must_index = 1;
                        break;
                case hpk_not:
                        *iter->buf = 0x00;
                        pref = 4;
                        break;
                case hpk_never:
                        *iter->buf = 0x10;
                        pref = 4;
                        break;
                default:
                        INCOMPL();
        }
        if (h->i) {
                if (hpk_more != num_encode(iter, pref, h->i))
                        return (hpk_err);
        } else {
                iter->buf++;
                if (hpk_more != str_encode(iter, &h->key))
                        return (hpk_err);
        }
        ret = str_encode(iter, &h->value);
        if (ret == hpk_err)
                return (hpk_err);
        if (must_index)
                push_header(iter->ctx, h);
        return (ret);

}

		varnish-cache/bin/varnishtest/vtc_h2_hpack.c
0		/*-
1		* Copyright (c) 2008-2016 Varnish Software AS
2		* All rights reserved.
3		*
4		* Author: Guillaume Quintard <guillaume.quintard@gmail.com>
5		*
6		* SPDX-License-Identifier: BSD-2-Clause
7		*
8		* Redistribution and use in source and binary forms, with or without
9		* modification, are permitted provided that the following conditions
10		* are met:
11		* 1. Redistributions of source code must retain the above copyright
12		* notice, this list of conditions and the following disclaimer.
13		* 2. Redistributions in binary form must reproduce the above copyright
14		* notice, this list of conditions and the following disclaimer in the
15		* documentation and/or other materials provided with the distribution.
16		*
17		* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18		* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19		* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20		* ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
21		* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22		* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23		* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24		* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25		* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26		* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27		* SUCH DAMAGE.
28		*/
29
30		#include <stdint.h>
31		#include <stdio.h>
32		#include <stdlib.h>
33		#include <string.h>
34
35
36		#include "vdef.h"
37
38		#include "vas.h"
39		#include "vqueue.h"
40
41		#include "hpack.h"
42		#include "vtc_h2_priv.h"
43
44		struct symbol {
45		uint32_t val;
46		uint8_t size;
47		};
48
49		static const struct symbol coding_table[] = {
50		#define HPACK(i, v, l) {v, l},
51		#include "vtc_h2_enctbl.h"
52		#undef HPACK
53		{0, 0}
54		};
55
56		#include "vtc_h2_dectbl.h"
57
58		#define MASK(pack, n) (pack >> (64 - n))
59		static int
60	33	huff_decode(char str, int nm, struct hpk_iter iter, int ilen)
61		{
62	33	int l = 0;
63	33	uint64_t pack = 0;
64	33	unsigned pl = 0; /* pack length*/
65	33	struct stbl *tbl = &tbl_0;
66		struct ssym *sym;
67
68	33	(void)nm;
69	381	while (ilen > 0 \|\| pl != 0) {
70		/* make sure we have enough data*/
71	381	if (pl < tbl->msk) {
72	81	if (ilen == 0) {
73	33	if (pl == 0 \|\| (MASK(pack, pl) ==
74	33	(unsigned)((1U << pl) - 1U))) {
75	33	assert(tbl == &tbl_0);
76	33	return (l);
77		}
78	0	}
79		/* fit as many bytes as we can in pack */
80	321	while (pl <= 56 && ilen > 0) {
81	546	pack \|= (uint64_t)(*iter->buf & 0xff)
82	273	<< (56 - pl);
83	273	pl += 8;
84	273	iter->buf++;
85	273	ilen--;
86		}
87	48	}
88	348	assert(tbl);
89	348	assert(tbl->msk);
90	348	sym = &tbl->syms[MASK(pack, tbl->msk)];
91
92	348	assert(sym->csm <= tbl->msk);
93
94	348	if (sym->csm == 0 \|\| pl < sym->csm)
95	0	return (0);
96
97	348	assert(sym->csm <= 8);
98	348	pack <<= sym->csm;
99	348	assert(sym->csm <= pl);
100	348	pl -= sym->csm;
101	348	if (sym->nxt) {
102	0	tbl = sym->nxt;
103	0	continue;
104		}
105	348	str[l++] = sym->chr;
106	348	tbl = &tbl_0;
107		}
108	0	return (l);
109	33	}
110
111		/* inspired from Dridi Boukelmoune's cashpack. */
112		static enum hpk_result
113	42	huff_encode(struct hpk_iter iter, const char str, int len)
114		{
115	42	uint64_t pack = 0;
116	42	int pl = 0; /* pack length*/
117		uint32_t v;
118		uint8_t s;
119
120	42	assert(iter->buf < iter->end);
121
122	474	while (len--) {
123	432	v = coding_table[(uint8_t)*str].val;
124	432	s = coding_table[(uint8_t)*str].size;
125
126	432	pl += s;
127	432	pack \|= (uint64_t)v << (64 - pl);
128
129	732	while (pl >= 8) {
130	300	if (iter->buf == iter->end)
131	0	return (hpk_done);
132	300	*iter->buf = (char)(pack >> 56);
133	300	iter->buf++;
134	300	pack <<= 8;
135	300	pl -= 8;
136		}
137	432	str++;
138		}
139
140		/* padding */
141	42	if (pl) {
142	42	assert(pl < 8);
143	42	if (iter->buf == iter->end)
144	0	return (hpk_done);
145	42	pl += 8;
146	42	pack \|= (uint64_t)0xff << (64 - pl);
147	42	*iter->buf = (char)(pack >> 56);
148	42	iter->buf++;
149	42	}
150
151	42	return (hpk_more);
152	42	}
153
154		static int
155	10980	huff_simulate(const char *str, int ilen, int huff)
156		{
157	10980	int olen = 0;
158	10980	if (!huff \|\| !ilen)
159	10938	return (ilen);
160	474	while (ilen--) {
161	432	olen += coding_table[(unsigned char)*str].size;
162	432	str++;
163		}
164	42	return ((olen + 7) / 8);
165	10980	}
166
167		static enum hpk_result
168	5994	num_decode(uint32_t result, struct hpk_iter iter, uint8_t prefix)
169		{
170	5994	uint8_t shift = 0;
171
172	5994	assert(iter->buf < iter->end);
173	5994	assert(prefix);
174	5994	assert(prefix <= 8);
175
176	5994	*result = 0;
177	5994	result = iter->buf & (0xff >> (8-prefix));
178	5994	if (*result < (1U << prefix) - 1U) {
179	4617	iter->buf++;
180	4617	return (ITER_DONE(iter));
181		}
182	1377	do {
183	1389	iter->buf++;
184	1389	if (iter->end == iter->buf)
185	0	return (hpk_err);
186		/* check for overflow */
187	1389	if ((UINT32_MAX - result) >> shift < (iter->buf & 0x7f))
188	0	return (hpk_err);
189
190	1389	result += (uint32_t)(iter->buf & 0x7f) << shift;
191	1389	shift += 7;
192	1389	} while (*iter->buf & 0x80);
193	1377	iter->buf++;
194
195	1377	return (ITER_DONE(iter));
196	5994	}
197
198		static enum hpk_result
199	11154	num_encode(struct hpk_iter *iter, uint8_t prefix, uint32_t num)
200		{
201	11154	assert(prefix);
202	11154	assert(prefix <= 8);
203	11154	assert(iter->buf < iter->end);
204
205	11154	uint8_t pmax = (1U << prefix) - 1U;
206
207	11154	*iter->buf &= 0xffU << prefix;
208	11154	if (num <= pmax) {
209	8151	*iter->buf++ \|= num;
210	8151	return (ITER_DONE(iter));
211	3003	} else if (iter->end - iter->buf < 2)
212	0	return (hpk_err);
213
214	3003	iter->buf[0] \|= pmax;
215	3003	num -= pmax;
216	3003	do {
217	6003	iter->buf++;
218	6003	if (iter->end == iter->buf)
219	0	return (hpk_err);
220	6003	*iter->buf = num % 128;
221	6003	*iter->buf \|= 0x80;
222	6003	num /= 128;
223	6003	} while (num);
224	3003	*iter->buf++ &= 127;
225	3003	return (ITER_DONE(iter));
226	11154	}
227
228		static enum hpk_result
229	10980	str_encode(struct hpk_iter iter, const struct hpk_txt t)
230		{
231	10980	int slen = huff_simulate(t->ptr, t->len, t->huff);
232	10980	assert(iter->buf < iter->end);
233	10980	if (t->huff)
234	42	*iter->buf = 0x80;
235		else
236	10938	*iter->buf = 0;
237
238	10980	if (hpk_err == num_encode(iter, 7, slen))
239	0	return (hpk_err);
240
241	10980	if (slen > iter->end - iter->buf)
242	0	return (hpk_err);
243
244	10980	if (t->huff) {
245	42	return (huff_encode(iter, t->ptr, t->len));
246		} else {
247	10938	memcpy(iter->buf, t->ptr, slen);
248	10938	iter->buf += slen;
249	10938	return (ITER_DONE(iter));
250		}
251	10980	}
252
253		static enum hpk_result
254	3288	str_decode(struct hpk_iter iter, struct hpk_txt t)
255		{
256		uint32_t num;
257		int huff;
258
259	3288	assert(iter->buf < iter->end);
260
261	3288	huff = (*iter->buf & 0x80);
262	3288	if (hpk_more != num_decode(&num, iter, 7))
263	0	return (hpk_err);
264	3288	assert(iter->buf < iter->end);
265	3288	if (num > (unsigned)(iter->end - iter->buf))
266	0	return (hpk_err);
267	3288	if (huff) { /Huffman encoding /
268	33	t->ptr = malloc((num * 8L) / 5L + 1L);
269	33	AN(t->ptr);
270	33	num = huff_decode(t->ptr, (num * 8) / 5, iter, num);
271	33	if (!num) {
272	0	free(t->ptr);
273	0	return (hpk_err);
274		}
275	33	t->huff = 1;
276		/* XXX: do we care? */
277	33	t->ptr = realloc(t->ptr, num + 1L);
278	33	AN(t->ptr);
279	33	} else { /* literal string */
280	3255	t->huff = 0;
281	3255	t->ptr = malloc(num + 1L);
282	3255	AN(t->ptr);
283	3255	memcpy(t->ptr, iter->buf, num);
284	3255	iter->buf += num;
285		}
286
287	3288	t->ptr[num] = '\0';
288	3288	t->len = num;
289
290	3288	return (ITER_DONE(iter));
291	3288	}
292
293		static inline void
294	2112	txtcpy(struct hpk_txt to, const struct hpk_txt from)
295		{
296		//AZ(to->ptr);
297	2112	to->ptr = malloc(from->len + 1L);
298	2112	AN(to->ptr);
299	2112	memcpy(to->ptr, from->ptr, from->len + 1L);
300	2112	to->len = from->len;
301	2112	}
302
303		int
304	3807	gethpk_iterLen(const struct hpk_iter *iter)
305		{
306	3807	return (iter->buf - iter->orig);
307		}
308
309		enum hpk_result
310	2706	HPK_DecHdr(struct hpk_iter iter, struct hpk_hdr header)
311		{
312	2706	int pref = 0;
313		const struct hpk_txt *t;
314		uint32_t num;
315	2706	int must_index = 0;
316	2706	assert(iter);
317	2706	assert(iter->buf < iter->end);
318		/* Indexed Header Field */
319	2706	if (*iter->buf & 128) {
320	345	header->t = hpk_idx;
321	345	if (hpk_err == num_decode(&num, iter, 7))
322	0	return (hpk_err);
323
324	345	if (num) { /* indexed key and value*/
325	345	t = tbl_get_key(iter->ctx, num);
326	345	if (!t)
327	6	return (hpk_err);
328	339	txtcpy(&header->key, t);
329
330	339	t = tbl_get_value(iter->ctx, num);
331	339	if (!t) {
332	0	free(header->key.ptr);
333	0	return (hpk_err);
334		}
335
336	339	txtcpy(&header->value, t);
337
338	339	if (iter->buf < iter->end)
339	333	return (hpk_more);
340		else
341	6	return (hpk_done);
342		} else
343	0	return (hpk_err);
344
345		}
346		/* Literal Header Field with Incremental Indexing */
347	2361	else if (*iter->buf >> 6 == 1) {
348	54	header->t = hpk_inc;
349	54	pref = 6;
350	54	must_index = 1;
351	54	}
352		/* Literal Header Field without Indexing */
353	2307	else if (*iter->buf >> 4 == 0) {
354	618	header->t = hpk_not;
355	618	pref = 4;
356	618	}
357		/* Literal Header Field never Indexed */
358	1689	else if (*iter->buf >> 4 == 1) {
359	1689	header->t = hpk_never;
360	1689	pref = 4;
361	1689	}
362		/* Dynamic Table Size Update */
363		/* XXX if under max allowed value */
364	0	else if (*iter->buf >> 5 == 1) {
365	0	if (hpk_done != num_decode(&num, iter, 5))
366	0	return (hpk_err);
367	0	return (HPK_ResizeTbl(iter->ctx, num));
368		} else {
369	0	return (hpk_err);
370		}
371
372	2361	assert(pref);
373	2361	if (hpk_more != num_decode(&num, iter, pref))
374	0	return (hpk_err);
375
376	2361	header->i = num;
377	2361	if (num) { /* indexed key */
378	1434	t = tbl_get_key(iter->ctx, num);
379	1434	if (!t)
380	0	return (hpk_err);
381	1434	txtcpy(&header->key, t);
382	1434	} else {
383	927	if (hpk_more != str_decode(iter, &header->key)) {
384	0	free(header->key.ptr);
385	0	return (hpk_err);
386		}
387		}
388
389	2361	if (hpk_err == str_decode(iter, &header->value)) {
390	0	free(header->key.ptr);
391	0	return (hpk_err);
392		}
393
394	2361	if (must_index)
395	54	push_header(iter->ctx, header);
396	2361	return (ITER_DONE(iter));
397	2706	}
398
399		enum hpk_result
400	5640	HPK_EncHdr(struct hpk_iter iter, const struct hpk_hdr h)
401		{
402		int pref;
403	5640	int must_index = 0;
404		enum hpk_result ret;
405	5640	switch (h->t) {
406		case hpk_idx:
407	126	*iter->buf = 0x80;
408	126	assert(num_encode(iter, 7, h->i) != hpk_err);
409	126	return (ITER_DONE(iter));
410		case hpk_inc:
411	66	*iter->buf = 0x40;
412	66	pref = 6;
413	66	must_index = 1;
414	66	break;
415		case hpk_not:
416	5445	*iter->buf = 0x00;
417	5445	pref = 4;
418	5445	break;
419		case hpk_never:
420	3	*iter->buf = 0x10;
421	3	pref = 4;
422	3	break;
423		default:
424	0	INCOMPL();
425	0	}
426	5514	if (h->i) {
427	48	if (hpk_more != num_encode(iter, pref, h->i))
428	0	return (hpk_err);
429	48	} else {
430	5466	iter->buf++;
431	5466	if (hpk_more != str_encode(iter, &h->key))
432	0	return (hpk_err);
433		}
434	5514	ret = str_encode(iter, &h->value);
435	5514	if (ret == hpk_err)
436	0	return (hpk_err);
437	5514	if (must_index)
438	66	push_header(iter->ctx, h);
439	5514	return (ret);
440
441	5640	}