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lsqpack.c
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lsqpack.c
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/*
* lsqpack.c -- LiteSpeed QPACK Compression Library: encoder and decoder.
*/
/*
MIT License
Copyright (c) 2018 - 2022 LiteSpeed Technologies Inc
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
*/
#ifndef LS_QPACK_USE_LARGE_TABLES
#define LS_QPACK_USE_LARGE_TABLES 1
#endif
#include <assert.h>
#include <errno.h>
#include <math.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <sys/queue.h>
#include <sys/types.h>
#include <inttypes.h>
#include "lsqpack.h"
#include "lsxpack_header.h"
#ifdef XXH_HEADER_NAME
#include XXH_HEADER_NAME
#else
#include <xxhash.h>
#endif
#include "huff-tables.h"
#define MIN(a, b) ((a) < (b) ? (a) : (b))
#define MAX(a, b) ((a) > (b) ? (a) : (b))
static unsigned char *
qenc_huffman_enc (const unsigned char *, const unsigned char *const, unsigned char *);
static unsigned
qenc_enc_str_size (const unsigned char *, unsigned);
struct static_table_entry
{
const char *name;
const char *val;
unsigned name_len;
unsigned val_len;
};
/* [draft-ietf-quic-qpack-03] Appendix A */
static const struct static_table_entry static_table[] =
{
{":authority", "", 10, 0,},
{":path", "/", 5, 1,},
{"age", "0", 3, 1,},
{"content-disposition", "", 19, 0,},
{"content-length", "0", 14, 1,},
{"cookie", "", 6, 0,},
{"date", "", 4, 0,},
{"etag", "", 4, 0,},
{"if-modified-since", "", 17, 0,},
{"if-none-match", "", 13, 0,},
{"last-modified", "", 13, 0,},
{"link", "", 4, 0,},
{"location", "", 8, 0,},
{"referer", "", 7, 0,},
{"set-cookie", "", 10, 0,},
{":method", "CONNECT", 7, 7,},
{":method", "DELETE", 7, 6,},
{":method", "GET", 7, 3,},
{":method", "HEAD", 7, 4,},
{":method", "OPTIONS", 7, 7,},
{":method", "POST", 7, 4,},
{":method", "PUT", 7, 3,},
{":scheme", "http", 7, 4,},
{":scheme", "https", 7, 5,},
{":status", "103", 7, 3,},
{":status", "200", 7, 3,},
{":status", "304", 7, 3,},
{":status", "404", 7, 3,},
{":status", "503", 7, 3,},
{"accept", "*/*", 6, 3,},
{"accept", "application/dns-message", 6, 23,},
{"accept-encoding", "gzip, deflate, br", 15, 17,},
{"accept-ranges", "bytes", 13, 5,},
{"access-control-allow-headers", "cache-control", 28, 13,},
{"access-control-allow-headers", "content-type", 28, 12,},
{"access-control-allow-origin", "*", 27, 1,},
{"cache-control", "max-age=0", 13, 9,},
{"cache-control", "max-age=2592000", 13, 15,},
{"cache-control", "max-age=604800", 13, 14,},
{"cache-control", "no-cache", 13, 8,},
{"cache-control", "no-store", 13, 8,},
{"cache-control", "public, max-age=31536000", 13, 24,},
{"content-encoding", "br", 16, 2,},
{"content-encoding", "gzip", 16, 4,},
{"content-type", "application/dns-message", 12, 23,},
{"content-type", "application/javascript", 12, 22,},
{"content-type", "application/json", 12, 16,},
{"content-type", "application/x-www-form-urlencoded", 12, 33,},
{"content-type", "image/gif", 12, 9,},
{"content-type", "image/jpeg", 12, 10,},
{"content-type", "image/png", 12, 9,},
{"content-type", "text/css", 12, 8,},
{"content-type", "text/html; charset=utf-8", 12, 24,},
{"content-type", "text/plain", 12, 10,},
{"content-type", "text/plain;charset=utf-8", 12, 24,},
{"range", "bytes=0-", 5, 8,},
{"strict-transport-security", "max-age=31536000", 25, 16,},
{"strict-transport-security", "max-age=31536000; includesubdomains",
25, 35,},
{"strict-transport-security",
"max-age=31536000; includesubdomains; preload", 25, 44,},
{"vary", "accept-encoding", 4, 15,},
{"vary", "origin", 4, 6,},
{"x-content-type-options", "nosniff", 22, 7,},
{"x-xss-protection", "1; mode=block", 16, 13,},
{":status", "100", 7, 3,},
{":status", "204", 7, 3,},
{":status", "206", 7, 3,},
{":status", "302", 7, 3,},
{":status", "400", 7, 3,},
{":status", "403", 7, 3,},
{":status", "421", 7, 3,},
{":status", "425", 7, 3,},
{":status", "500", 7, 3,},
{"accept-language", "", 15, 0,},
{"access-control-allow-credentials", "FALSE", 32, 5,},
{"access-control-allow-credentials", "TRUE", 32, 4,},
{"access-control-allow-headers", "*", 28, 1,},
{"access-control-allow-methods", "get", 28, 3,},
{"access-control-allow-methods", "get, post, options", 28, 18,},
{"access-control-allow-methods", "options", 28, 7,},
{"access-control-expose-headers", "content-length", 29, 14,},
{"access-control-request-headers", "content-type", 30, 12,},
{"access-control-request-method", "get", 29, 3,},
{"access-control-request-method", "post", 29, 4,},
{"alt-svc", "clear", 7, 5,},
{"authorization", "", 13, 0,},
{"content-security-policy",
"script-src 'none'; object-src 'none'; base-uri 'none'", 23, 53,},
{"early-data", "1", 10, 1,},
{"expect-ct", "", 9, 0,},
{"forwarded", "", 9, 0,},
{"if-range", "", 8, 0,},
{"origin", "", 6, 0,},
{"purpose", "prefetch", 7, 8,},
{"server", "", 6, 0,},
{"timing-allow-origin", "*", 19, 1,},
{"upgrade-insecure-requests", "1", 25, 1,},
{"user-agent", "", 10, 0,},
{"x-forwarded-for", "", 15, 0,},
{"x-frame-options", "deny", 15, 4,},
{"x-frame-options", "sameorigin", 15, 10,},
};
#define QPACK_STATIC_TABLE_SIZE (sizeof(static_table) / sizeof(static_table[0]))
/* RFC 7541, Section 4.1:
*
* " The size of the dynamic table is the sum of the size of its entries.
* "
* " The size of an entry is the sum of its name's length in octets (as
* " defined in Section 5.2), its value's length in octets, and 32.
*/
#define DYNAMIC_ENTRY_OVERHEAD 32u
/* Initial guess at number of header fields per list: */
#define GUESS_N_HEADER_FIELDS 12
#define MAX_QUIC_STREAM_ID ((1ull << 62) - 1)
#ifdef LSQPACK_ENC_LOGGER_HEADER
#include LSQPACK_ENC_LOGGER_HEADER
#else
#define E_LOG(prefix, ...) do { \
if (enc->qpe_logger_ctx) { \
fprintf(enc->qpe_logger_ctx, prefix); \
fprintf(enc->qpe_logger_ctx, __VA_ARGS__); \
fprintf(enc->qpe_logger_ctx, "\n"); \
} \
} while (0)
#define E_DEBUG(...) E_LOG("qenc: debug: ", __VA_ARGS__)
#define E_INFO(...) E_LOG("qenc: info: ", __VA_ARGS__)
#define E_WARN(...) E_LOG("qenc: warn: ", __VA_ARGS__)
#define E_ERROR(...) E_LOG("qenc: error: ", __VA_ARGS__)
#endif
/* Entries in the encoder's dynamic table are hashed 1) by name and 2) by
* name and value. Instead of having two arrays of buckets, the encoder
* keeps just one, but each bucket has two heads.
*/
struct lsqpack_double_enc_head
{
struct lsqpack_enc_head by_name;
struct lsqpack_enc_head by_nameval;
};
struct lsqpack_enc_table_entry
{
/* An entry always lives on all three lists */
STAILQ_ENTRY(lsqpack_enc_table_entry)
ete_next_nameval,
ete_next_name,
ete_next_all;
lsqpack_abs_id_t ete_id;
unsigned ete_when_added_used;
unsigned ete_when_added_dropped;
unsigned ete_n_reffd;
unsigned ete_nameval_hash;
unsigned ete_name_hash;
unsigned ete_name_len;
unsigned ete_val_len;
char ete_buf[0];
};
#define ETE_NAME(ete) ((ete)->ete_buf)
#define ETE_VALUE(ete) (&(ete)->ete_buf[(ete)->ete_name_len])
#define ENTRY_COST(name_len, value_len) (DYNAMIC_ENTRY_OVERHEAD + \
name_len + value_len)
#define ETE_SIZE(ete) ENTRY_COST((ete)->ete_name_len, (ete)->ete_val_len)
#define N_BUCKETS(n_bits) (1U << (n_bits))
#define BUCKNO(n_bits, hash) ((hash) & (N_BUCKETS(n_bits) - 1))
struct lsqpack_header_info
{
TAILQ_ENTRY(lsqpack_header_info) qhi_next_all;
TAILQ_ENTRY(lsqpack_header_info) qhi_next_risked;
struct lsqpack_header_info *qhi_same_stream_id; /* Circular list */
uint64_t qhi_stream_id;
unsigned qhi_seqno;
unsigned qhi_bytes_inserted;
lsqpack_abs_id_t qhi_min_id;
lsqpack_abs_id_t qhi_max_id;
};
/* Absolute index starts with 1. 0 indicates that the value is not set */
#define HINFO_IDS_SET(hinfo) ((hinfo)->qhi_max_id != 0)
/* Header info structures are kept in a list of arrays, which is faster than
* searching through a linked list whose elements may be all over the place
* in memory. This is important because we need to look up header infos by
* stream ID and also calculate the minimum absolute ID. If not sequential
* search, we would need to implement a hybrid of min-heap and a hash (or
* search tree) and that seems to be an overkill for something that is not
* likely to have more than a few hundred elements at the most.
*/
struct lsqpack_header_info_arr
{
STAILQ_ENTRY(lsqpack_header_info_arr) hia_next;
uint64_t hia_slots;
struct lsqpack_header_info hia_hinfos[64];
};
static unsigned
find_free_slot (uint64_t slots)
{
#if __GNUC__
return __builtin_ffsll(~slots) - 1;
#else
unsigned n;
slots =~ slots;
n = 0;
if (0 == (slots & ((1ULL << 32) - 1))) { n += 32; slots >>= 32; }
if (0 == (slots & ((1ULL << 16) - 1))) { n += 16; slots >>= 16; }
if (0 == (slots & ((1ULL << 8) - 1))) { n += 8; slots >>= 8; }
if (0 == (slots & ((1ULL << 4) - 1))) { n += 4; slots >>= 4; }
if (0 == (slots & ((1ULL << 2) - 1))) { n += 2; slots >>= 2; }
if (0 == (slots & ((1ULL << 1) - 1))) { n += 1; slots >>= 1; }
return n;
#endif
}
static struct lsqpack_header_info *
enc_alloc_hinfo (struct lsqpack_enc *enc)
{
struct lsqpack_header_info_arr *hiarr;
struct lsqpack_header_info *hinfo;
unsigned slot;
STAILQ_FOREACH(hiarr, &enc->qpe_hinfo_arrs, hia_next)
if (hiarr->hia_slots != ~0ULL)
break;
if (!hiarr)
{
if (0 == (enc->qpe_flags & LSQPACK_ENC_NO_MEM_GUARD)
&& enc->qpe_hinfo_arrs_count * sizeof(*hiarr)
>= enc->qpe_cur_max_capacity)
return NULL;
hiarr = malloc(sizeof(*hiarr));
if (!hiarr)
return NULL;
hiarr->hia_slots = 0;
STAILQ_INSERT_TAIL(&enc->qpe_hinfo_arrs, hiarr, hia_next);
++enc->qpe_hinfo_arrs_count;
}
slot = find_free_slot(hiarr->hia_slots);
hiarr->hia_slots |= 1ULL << slot;
hinfo = &hiarr->hia_hinfos[ slot ];
memset(hinfo, 0, sizeof(*hinfo));
hinfo->qhi_same_stream_id = hinfo;
TAILQ_INSERT_TAIL(&enc->qpe_all_hinfos, hinfo, qhi_next_all);
return hinfo;
}
static void
enc_free_hinfo (struct lsqpack_enc *enc, struct lsqpack_header_info *hinfo)
{
struct lsqpack_header_info_arr *hiarr;
unsigned slot;
STAILQ_FOREACH(hiarr, &enc->qpe_hinfo_arrs, hia_next)
if (hinfo >= hiarr->hia_hinfos && hinfo < &hiarr->hia_hinfos[64])
{
slot = hinfo - hiarr->hia_hinfos;
hiarr->hia_slots &= ~(1ULL << slot);
TAILQ_REMOVE(&enc->qpe_all_hinfos, &hiarr->hia_hinfos[slot], qhi_next_all);
return;
}
assert(0);
}
static int
enc_use_dynamic_table (const struct lsqpack_enc *enc)
{
return enc->qpe_max_entries > 0
&& enc->qpe_cur_header.hinfo != NULL
&& enc->qpe_cur_header.hinfo->qhi_bytes_inserted
< enc->qpe_cur_max_capacity / 2;
}
enum he { HE_NAME, HE_NAMEVAL, N_HES };
struct lsqpack_hist_el {
unsigned he_hashes[N_HES];
};
static void
qenc_hist_update_size (struct lsqpack_enc *enc, unsigned new_size)
{
struct lsqpack_hist_el *els;
unsigned first, count, i, j;
if (new_size == enc->qpe_hist_nels)
return;
if (new_size == 0)
{
enc->qpe_hist_nels = 0;
enc->qpe_hist_idx = 0;
enc->qpe_hist_wrapped = 0;
return;
}
els = malloc(sizeof(els[0]) * (new_size + 1));
if (!els)
return;
E_DEBUG("history size change from %u to %u", enc->qpe_hist_nels, new_size);
if (enc->qpe_hist_wrapped)
{
first = (enc->qpe_hist_idx + 1) % enc->qpe_hist_nels;
count = enc->qpe_hist_nels;
}
else
{
first = 0;
count = enc->qpe_hist_idx;
}
for (i = 0, j = 0; count > 0 && j < new_size; ++i, ++j, --count)
els[j] = enc->qpe_hist_els[ (first + i) % enc->qpe_hist_nels ];
enc->qpe_hist_nels = new_size;
enc->qpe_hist_idx = j % new_size;
enc->qpe_hist_wrapped = enc->qpe_hist_idx == 0;
free(enc->qpe_hist_els);
enc->qpe_hist_els = els;
}
static void
qenc_hist_add (struct lsqpack_enc *enc, unsigned name_hash,
unsigned nameval_hash)
{
if (enc->qpe_hist_nels)
{
enc->qpe_hist_els[ enc->qpe_hist_idx ].he_hashes[HE_NAME] = name_hash;
enc->qpe_hist_els[ enc->qpe_hist_idx ].he_hashes[HE_NAMEVAL]
= nameval_hash;
enc->qpe_hist_idx = (enc->qpe_hist_idx + 1) % enc->qpe_hist_nels;
enc->qpe_hist_wrapped |= enc->qpe_hist_idx == 0;
}
}
static int
qenc_hist_seen (struct lsqpack_enc *enc, enum he he, unsigned hash)
{
const struct lsqpack_hist_el *el;
unsigned last_idx;
if (enc->qpe_hist_els)
{
if (enc->qpe_hist_wrapped)
last_idx = enc->qpe_hist_nels;
else
last_idx = enc->qpe_hist_idx;
enc->qpe_hist_els[ last_idx ].he_hashes[he] = hash;
for (el = enc->qpe_hist_els; el->he_hashes[he] != hash; ++el)
;
return el < &enc->qpe_hist_els[ last_idx ];
}
else
return 1;
}
unsigned char *
lsqpack_enc_int (unsigned char *, unsigned char *const, uint64_t, unsigned);
void
lsqpack_enc_preinit (struct lsqpack_enc *enc, void *logger_ctx)
{
memset(enc, 0, sizeof(*enc));
STAILQ_INIT(&enc->qpe_all_entries);
STAILQ_INIT(&enc->qpe_hinfo_arrs);
TAILQ_INIT(&enc->qpe_all_hinfos);
TAILQ_INIT(&enc->qpe_risked_hinfos);
enc->qpe_logger_ctx = logger_ctx;
E_DEBUG("preinitialized");
};
int
lsqpack_enc_init (struct lsqpack_enc *enc, void *logger_ctx,
unsigned max_table_size, unsigned dyn_table_size,
unsigned max_risked_streams, enum lsqpack_enc_opts enc_opts,
unsigned char *tsu_buf, size_t *tsu_buf_sz)
{
struct lsqpack_double_enc_head *buckets;
unsigned char *p;
unsigned nbits = 2;
unsigned i;
if (dyn_table_size > max_table_size)
{
errno = EINVAL;
return -1;
}
if (!(enc_opts & LSQPACK_ENC_OPT_STAGE_2))
lsqpack_enc_preinit(enc, logger_ctx);
if (dyn_table_size != LSQPACK_DEF_DYN_TABLE_SIZE)
{
if (!(tsu_buf && tsu_buf_sz && *tsu_buf_sz))
{
errno = EINVAL;
return -1;
}
p = tsu_buf;
*p = 0x20;
p = lsqpack_enc_int(p, tsu_buf + *tsu_buf_sz, dyn_table_size, 5);
if (p <= tsu_buf)
{
errno = ENOBUFS;
return -1;
}
E_DEBUG("generated TSU=%u instruction %zd byte%.*s in size",
dyn_table_size, p - tsu_buf, p - tsu_buf != 1, "s");
*tsu_buf_sz = p - tsu_buf;
}
else if (tsu_buf_sz)
*tsu_buf_sz = 0;
if (!(enc_opts & LSQPACK_ENC_OPT_IX_AGGR))
{
enc->qpe_hist_nels = MAX(
/* Initial guess at number of entries in dynamic table: */
dyn_table_size / DYNAMIC_ENTRY_OVERHEAD / 3,
GUESS_N_HEADER_FIELDS
);
enc->qpe_hist_els = malloc(sizeof(enc->qpe_hist_els[0]) * (enc->qpe_hist_nels + 1));
if (!enc->qpe_hist_els)
return -1;
}
else
{
enc->qpe_hist_nels = 0;
enc->qpe_hist_els = NULL;
}
if (max_table_size / DYNAMIC_ENTRY_OVERHEAD)
{
nbits = 2;
buckets = malloc(sizeof(buckets[0]) * N_BUCKETS(nbits));
if (!buckets)
{
free(enc->qpe_hist_els);
return -1;
}
for (i = 0; i < N_BUCKETS(nbits); ++i)
{
STAILQ_INIT(&buckets[i].by_name);
STAILQ_INIT(&buckets[i].by_nameval);
}
}
else
{
nbits = 0;
buckets = NULL;
}
enc->qpe_max_entries = max_table_size / DYNAMIC_ENTRY_OVERHEAD;
enc->qpe_real_max_capacity = max_table_size;
enc->qpe_cur_max_capacity = dyn_table_size;
enc->qpe_max_risked_streams = max_risked_streams;
enc->qpe_buckets = buckets;
enc->qpe_nbits = nbits;
enc->qpe_logger_ctx = logger_ctx;
if (!(enc_opts & LSQPACK_ENC_OPT_NO_DUP))
enc->qpe_flags |= LSQPACK_ENC_USE_DUP;
if (enc_opts & LSQPACK_ENC_OPT_NO_MEM_GUARD)
enc->qpe_flags |= LSQPACK_ENC_NO_MEM_GUARD;
E_DEBUG("initialized. opts: 0x%X; max capacity: %u; max risked "
"streams: %u.", enc_opts, enc->qpe_cur_max_capacity,
enc->qpe_max_risked_streams);
return 0;
}
void
lsqpack_enc_cleanup (struct lsqpack_enc *enc)
{
struct lsqpack_enc_table_entry *entry, *next;
struct lsqpack_header_info_arr *hiarr, *next_hiarr;
for (entry = STAILQ_FIRST(&enc->qpe_all_entries); entry; entry = next)
{
next = STAILQ_NEXT(entry, ete_next_all);
free(entry);
}
for (hiarr = STAILQ_FIRST(&enc->qpe_hinfo_arrs); hiarr; hiarr = next_hiarr)
{
next_hiarr = STAILQ_NEXT(hiarr, hia_next);
free(hiarr);
}
free(enc->qpe_buckets);
free(enc->qpe_hist_els);
E_DEBUG("cleaned up");
}
#define LSQPACK_XXH_SEED 39378473
#define XXH_NAME_WIDTH 9
#define XXH_NAME_SHIFT 0
#define XXH_NAMEVAL_WIDTH 9
#define XXH_NAMEVAL_SHIFT 0
static const unsigned char name2id_plus_one[ 1 << XXH_NAME_WIDTH ] =
{
[347] = 1, [397] = 2, [64] = 3, [144] = 4, [25] = 5,
[216] = 6, [361] = 7, [442] = 8, [190] = 9, [404] = 10,
[181] = 11, [210] = 12, [38] = 13, [51] = 14, [318] = 15,
[484] = 16, [81] = 23, [83] = 25, [248] = 30, [169] = 32,
[456] = 33, [479] = 34, [59] = 36, [498] = 37, [401] = 43,
[453] = 45, [266] = 56, [88] = 57, [317] = 60, [74] = 62,
[189] = 63, [211] = 73, [334] = 74, [365] = 77, [382] = 80,
[377] = 81, [257] = 82, [56] = 84, [321] = 85, [79] = 86,
[384] = 87, [357] = 88, [438] = 89, [84] = 90, [264] = 91,
[146] = 92, [225] = 93, [490] = 94, [305] = 95, [362] = 96,
[486] = 97, [497] = 98,
};
static const unsigned char nameval2id_plus_one[ 1 << XXH_NAMEVAL_WIDTH ] =
{
[150] = 1, [502] = 2, [353] = 3, [262] = 4, [443] = 5,
[164] = 6, [463] = 7, [84] = 8, [205] = 9, [228] = 10,
[451] = 11, [444] = 12, [176] = 13, [75] = 14, [399] = 15,
[56] = 16, [384] = 17, [21] = 18, [484] = 19, [382] = 20,
[439] = 21, [329] = 22, [360] = 23, [67] = 24, [105] = 25,
[342] = 26, [457] = 27, [161] = 28, [337] = 29, [135] = 30,
[314] = 31, [370] = 32, [404] = 33, [184] = 34, [156] = 35,
[139] = 36, [339] = 37, [508] = 38, [267] = 39, [375] = 40,
[122] = 41, [297] = 42, [144] = 43, [85] = 44, [466] = 45,
[38] = 46, [320] = 47, [273] = 48, [277] = 49, [136] = 50,
[454] = 51, [477] = 52, [91] = 53, [227] = 54, [301] = 55,
[272] = 56, [319] = 57, [142] = 58, [268] = 59, [65] = 60,
[410] = 61, [4] = 62, [373] = 63, [1] = 64, [210] = 65,
[224] = 66, [423] = 67, [222] = 68, [386] = 69, [12] = 70,
[7] = 71, [391] = 72, [73] = 73, [307] = 74, [27] = 75,
[256] = 76, [154] = 77, [204] = 78, [310] = 79, [198] = 80,
[162] = 81, [334] = 82, [438] = 83, [69] = 84, [188] = 85,
[244] = 86, [190] = 87, [465] = 88, [468] = 89, [417] = 90,
[110] = 91, [107] = 92, [368] = 93, [460] = 94, [54] = 95,
[492] = 96, [402] = 97, [196] = 98, [383] = 99,
};
static const uint32_t name_hashes[] =
{
0x653A915Bu, 0x3513518Du, 0xBEC8E440u, 0x16020A90u, 0x48F5CC19u,
0x0B486ED8u, 0x1A7AA369u, 0x6DE855BAu, 0xF2BADABEu, 0xD8CA2594u,
0x6B86C0B5u, 0xC62FECD2u, 0x8DA64A26u, 0x01F10233u, 0x8F7E493Eu,
0xC7742BE4u, 0xC7742BE4u, 0xC7742BE4u, 0xC7742BE4u, 0xC7742BE4u,
0xC7742BE4u, 0xC7742BE4u, 0xF49F1451u, 0xF49F1451u, 0x672BDA53u,
0x672BDA53u, 0x672BDA53u, 0x672BDA53u, 0x672BDA53u, 0x1AB214F8u,
0x1AB214F8u, 0xF93AD8A9u, 0x1DC691C8u, 0x7C21CFDFu, 0x7C21CFDFu,
0x7D3B7A3Bu, 0xC25511F2u, 0xC25511F2u, 0xC25511F2u, 0xC25511F2u,
0xC25511F2u, 0xC25511F2u, 0x48011191u, 0x48011191u, 0x085EF7C5u,
0x085EF7C5u, 0x085EF7C5u, 0x085EF7C5u, 0x085EF7C5u, 0x085EF7C5u,
0x085EF7C5u, 0x085EF7C5u, 0x085EF7C5u, 0x085EF7C5u, 0x085EF7C5u,
0xB396750Au, 0x85E74C58u, 0x85E74C58u, 0x85E74C58u, 0x1A04DF3Du,
0x1A04DF3Du, 0x28686A4Au, 0x9F8BCEBDu, 0x672BDA53u, 0x672BDA53u,
0x672BDA53u, 0x672BDA53u, 0x672BDA53u, 0x672BDA53u, 0x672BDA53u,
0x672BDA53u, 0x672BDA53u, 0x98BD32D3u, 0x0A829D4Eu, 0x0A829D4Eu,
0x7C21CFDFu, 0x363F796Du, 0x363F796Du, 0x363F796Du, 0xD8A0B17Eu,
0xAAF9FD79u, 0x617E4501u, 0x617E4501u, 0x1E6DBE38u, 0x19D88141u,
0x3392084Fu, 0x5579EF80u, 0x8F3D7765u, 0x7EDC71B6u, 0xFBA64C54u,
0x3ECDA708u, 0xEBA96E92u, 0x82E1B4E1u, 0x5AD275EAu, 0xDD09E931u,
0x34C0456Au, 0x5EF889E6u, 0x4B1BB7F1u, 0x4B1BB7F1u,
};
static const uint32_t nameval_hashes[] =
{
0xF8614896u, 0xC8C267F6u, 0xF4617F61u, 0x8410A906u, 0xC8D109BBu,
0x51D448A4u, 0x52C167CFu, 0xFB22AA54u, 0x4F5272CDu, 0x9D4170E4u,
0x4E8C1DC3u, 0x684BDDBCu, 0xE113A2B0u, 0x5010D24Bu, 0xBCA5998Fu,
0xC8490E38u, 0x19094780u, 0x25D95A15u, 0x342283E4u, 0x15893F7Eu,
0x33968BB7u, 0x4C856F49u, 0x98573F68u, 0x16DDE443u, 0x813C3469u,
0x352A6556u, 0xD7988BC9u, 0x65E6ECA1u, 0x7EEE2551u, 0x77EBAE87u,
0xBDF5A53Au, 0x7F49F172u, 0xC06A7994u, 0xDB2FBCB8u, 0x343EA49Cu,
0xD143768Bu, 0x3E2D8753u, 0xA2EA09FCu, 0x467B5D0Bu, 0xCEB7F977u,
0x7119DC7Au, 0xDEFDA129u, 0x3F6EBC90u, 0x14E09A55u, 0x43C8B9D2u,
0xA707C426u, 0xFE372940u, 0x77591711u, 0xA6410F15u, 0xEACDE488u,
0x8B2C4DC6u, 0x8C2B11DDu, 0x9703CE5Bu, 0x0FAA28E3u, 0x13CCE32Du,
0xDCD68310u, 0x416F0B3Fu, 0x3BB4D68Eu, 0xF81F070Cu, 0xBDD89641u,
0x3915039Au, 0xF609E604u, 0x1C9DBB75u, 0x7ACD6A01u, 0xD4F462D2u,
0x125E66E0u, 0x0AD44FA7u, 0x4C3C90DEu, 0x27AD6982u, 0x0673640Cu,
0x65C03607u, 0xB05B7B87u, 0x97E01849u, 0xBA18BD33u, 0xDEF6041Bu,
0xE227F500u, 0x8A871E9Au, 0xCB120ACCu, 0x4B1B6336u, 0xEBDA42C6u,
0xFF166CA2u, 0x3A5E054Eu, 0x027207B6u, 0x04E3E645u, 0xAA95A0BCu,
0x77BFA4F4u, 0x3C95E0BEu, 0xD506A9D1u, 0x443EDFD4u, 0xD4E28BA1u,
0xA60BF66Eu, 0x46201E6Bu, 0xB2DE5570u, 0xF19F5DCCu, 0x73B6C636u,
0xDC83E7ECu, 0xAA333392u, 0x4EDB46C4u, 0xF64F937Fu,
};
/* -1 means not found */
static int
find_in_static_full (uint32_t nameval_hash, const char *name,
unsigned name_len, const char *val, unsigned val_len)
{
unsigned id;
id = nameval2id_plus_one[ (nameval_hash >> XXH_NAMEVAL_SHIFT)
& ((1 << XXH_NAMEVAL_WIDTH) - 1) ];
if (id == 0)
return -1;
--id;
if (static_table[id].name_len == name_len
&& static_table[id].val_len == val_len
&& memcmp(static_table[id].name, name, name_len) == 0
&& memcmp(static_table[id].val, val, val_len) == 0)
return id;
else
return -1;
}
#ifdef NDEBUG
static
#endif
int
lsqpack_find_in_static_headers (uint32_t name_hash, const char *name,
unsigned name_len)
{
unsigned id;
id = name2id_plus_one[ (name_hash >> XXH_NAME_SHIFT)
& ((1 << XXH_NAME_WIDTH) - 1) ];
if (id == 0)
return -1;
--id;
if (static_table[id].name_len == name_len
&& memcmp(static_table[id].name, name, name_len) == 0)
return id;
else
return -1;
}
static unsigned
lsqpack_val2len (uint64_t value, unsigned prefix_bits)
{
uint64_t mask = (1ULL << prefix_bits) - 1;
return 1
+ (value >= mask )
+ (value >= ((1ULL << 7) + mask))
+ (value >= ((1ULL << 14) + mask))
+ (value >= ((1ULL << 21) + mask))
+ (value >= ((1ULL << 28) + mask))
+ (value >= ((1ULL << 35) + mask))
+ (value >= ((1ULL << 42) + mask))
+ (value >= ((1ULL << 49) + mask))
+ (value >= ((1ULL << 56) + mask))
+ (value >= ((1ULL << 63) + mask))
;
}
unsigned char *
lsqpack_enc_int (unsigned char *dst, unsigned char *const end, uint64_t value,
unsigned prefix_bits)
{
unsigned char *const dst_orig = dst;
/* This function assumes that at least one byte is available */
assert(dst < end);
if (value < ((uint64_t)1 << prefix_bits) - 1)
*dst++ |= value;
else
{
*dst++ |= (1 << prefix_bits) - 1;
value -= (1 << prefix_bits) - 1;
while (value >= 128)
{
if (dst < end)
{
*dst++ = 0x80 | (unsigned char) value;
value >>= 7;
}
else
return dst_orig;
}
if (dst < end)
*dst++ = (unsigned char) value;
else
return dst_orig;
}
return dst;
}
static void
lsqpack_enc_int_nocheck (unsigned char *dst, uint64_t value,
unsigned prefix_bits)
{
if (value < ((uint64_t)1 << prefix_bits) - 1)
*dst++ |= value;
else
{
*dst++ |= (1 << prefix_bits) - 1;
value -= (1 << prefix_bits) - 1;
while (value >= 128)
{
*dst++ = 0x80 | (unsigned char) value;
value >>= 7;
}
*dst++ = (unsigned char) value;
}
}
int
lsqpack_enc_enc_str (unsigned prefix_bits, unsigned char *const dst,
size_t dst_len, const unsigned char *str, unsigned str_len)
{
unsigned char *p;
unsigned enc_size_bytes, len_size;
enc_size_bytes = qenc_enc_str_size(str, str_len);
if (enc_size_bytes < str_len)
{
len_size = lsqpack_val2len(enc_size_bytes, prefix_bits);
if (len_size + enc_size_bytes <= dst_len)
{
*dst &= ~((1 << (prefix_bits + 1)) - 1);
*dst |= 1 << prefix_bits;
lsqpack_enc_int_nocheck(dst, enc_size_bytes, prefix_bits);
p = qenc_huffman_enc(str, str + str_len, dst + len_size);
assert((unsigned) (p - dst) == len_size + enc_size_bytes);
return p - dst;
}
else
return -1;
}
else
{
len_size = lsqpack_val2len(str_len, prefix_bits);
if (len_size + str_len <= dst_len)
{
*dst &= ~((1 << (prefix_bits + 1)) - 1);
lsqpack_enc_int_nocheck(dst, str_len, prefix_bits);
memcpy(dst + len_size, str, str_len);
return len_size + str_len;
}
else
return -1;
}
}
static void
qenc_drop_oldest_entry (struct lsqpack_enc *enc)
{
struct lsqpack_enc_table_entry *entry;
unsigned buckno;
entry = STAILQ_FIRST(&enc->qpe_all_entries);
assert(entry);
E_DEBUG("drop entry %u (`%.*s': `%.*s'), nelem: %u; capacity: %u",
entry->ete_id, (int) entry->ete_name_len, ETE_NAME(entry),
(int) entry->ete_val_len, ETE_VALUE(entry), enc->qpe_nelem - 1,
enc->qpe_cur_bytes_used - ETE_SIZE(entry));
STAILQ_REMOVE_HEAD(&enc->qpe_all_entries, ete_next_all);
buckno = BUCKNO(enc->qpe_nbits, entry->ete_nameval_hash);
assert(entry == STAILQ_FIRST(&enc->qpe_buckets[buckno].by_nameval));
STAILQ_REMOVE_HEAD(&enc->qpe_buckets[buckno].by_nameval, ete_next_nameval);
buckno = BUCKNO(enc->qpe_nbits, entry->ete_name_hash);
assert(entry == STAILQ_FIRST(&enc->qpe_buckets[buckno].by_name));
STAILQ_REMOVE_HEAD(&enc->qpe_buckets[buckno].by_name, ete_next_name);
enc->qpe_dropped += ETE_SIZE(entry);
enc->qpe_cur_bytes_used -= ETE_SIZE(entry);
--enc->qpe_nelem;
free(entry);
}
static float
qenc_effective_fill (const struct lsqpack_enc *enc)
{
struct lsqpack_enc_table_entry *entry, *dup;
unsigned dups_size = 0;
assert(enc->qpe_cur_max_capacity);
STAILQ_FOREACH(entry, &enc->qpe_all_entries, ete_next_all)
for (dup = STAILQ_NEXT(entry, ete_next_all); dup;
dup = STAILQ_NEXT(dup, ete_next_all))
if (dup->ete_name_len == entry->ete_name_len &&
dup->ete_val_len == entry->ete_val_len &&
0 == memcmp(ETE_NAME(dup), ETE_NAME(entry),
dup->ete_name_len + dup->ete_val_len))
{
dups_size += ETE_SIZE(dup);
break;
}
return (float) (enc->qpe_cur_bytes_used - dups_size)
/ (float) enc->qpe_cur_max_capacity;
}
static void
update_ema (float *val, unsigned new)
{
if (*val)
*val = (new - *val) * 0.4 + *val;
else
*val = new;
}
static void
qenc_sample_table_size (struct lsqpack_enc *enc)
{
update_ema(&enc->qpe_table_nelem_ema, enc->qpe_nelem);
E_DEBUG("table size actual: %u; exponential moving average: %.3f",
enc->qpe_nelem, enc->qpe_table_nelem_ema);
}
static void
qenc_sample_header_count (struct lsqpack_enc *enc)
{
update_ema(&enc->qpe_header_count_ema,
enc->qpe_cur_header.n_hdr_added_to_hist);
E_DEBUG("header count actual: %u; exponential moving average: %.3f",
enc->qpe_cur_header.n_hdr_added_to_hist, enc->qpe_header_count_ema);
}
static void
qenc_remove_overflow_entries (struct lsqpack_enc *enc)
{
int dropped;
dropped = 0;
while (enc->qpe_cur_bytes_used > enc->qpe_cur_max_capacity)
{
qenc_drop_oldest_entry(enc);
++dropped;
}
if (enc->qpe_logger_ctx && enc->qpe_cur_max_capacity)
{
if (enc->qpe_flags & LSQPACK_ENC_USE_DUP)
E_DEBUG("fill: %.2f; effective fill: %.2f",
(float) enc->qpe_cur_bytes_used / (float) enc->qpe_cur_max_capacity,
qenc_effective_fill(enc));
else
E_DEBUG("fill: %.2f",
(float) enc->qpe_cur_bytes_used / (float) enc->qpe_cur_max_capacity);
}
/* It's important to sample only when entries have been dropped: that
* indicates that the table is being cycled through.
*/
if (dropped && enc->qpe_hist_els)
qenc_sample_table_size(enc);
}
static int
qenc_grow_tables (struct lsqpack_enc *enc)
{
struct lsqpack_double_enc_head *new_buckets, *new[2];
struct lsqpack_enc_table_entry *entry;
unsigned n, old_nbits;
int idx;
old_nbits = enc->qpe_nbits;
new_buckets = malloc(sizeof(enc->qpe_buckets[0])
* N_BUCKETS(old_nbits + 1));
if (!new_buckets)
return -1;
for (n = 0; n < N_BUCKETS(old_nbits); ++n)
{
new[0] = &new_buckets[n];
new[1] = &new_buckets[n + N_BUCKETS(old_nbits)];
STAILQ_INIT(&new[0]->by_name);
STAILQ_INIT(&new[1]->by_name);
STAILQ_INIT(&new[0]->by_nameval);
STAILQ_INIT(&new[1]->by_nameval);
while (entry = STAILQ_FIRST(&enc->qpe_buckets[n].by_name), entry != NULL)
{
STAILQ_REMOVE_HEAD(&enc->qpe_buckets[n].by_name, ete_next_name);
idx = (BUCKNO(old_nbits + 1, entry->ete_name_hash)
>> old_nbits) & 1;
STAILQ_INSERT_TAIL(&new[idx]->by_name, entry, ete_next_name);
}
while (entry = STAILQ_FIRST(&enc->qpe_buckets[n].by_nameval), entry != NULL)
{
STAILQ_REMOVE_HEAD(&enc->qpe_buckets[n].by_nameval,
ete_next_nameval);
idx = (BUCKNO(old_nbits + 1, entry->ete_nameval_hash)
>> old_nbits) & 1;
STAILQ_INSERT_TAIL(&new[idx]->by_nameval, entry,
ete_next_nameval);
}
}
free(enc->qpe_buckets);
enc->qpe_nbits = old_nbits + 1;
enc->qpe_buckets = new_buckets;
return 0;