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nghttp2/lib/nghttp2_hd.c

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/*
* nghttp2 - HTTP/2 C Library
*
* Copyright (c) 2013 Tatsuhiro Tsujikawa
*
* 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.
*/
#include "nghttp2_hd.h"
#include <string.h>
#include <assert.h>
#include <stdio.h>
#include "nghttp2_helper.h"
#include "nghttp2_int.h"
/* Make scalar initialization form of nghttp2_nv */
#define MAKE_STATIC_ENT(I, N, V, NH, VH) \
{ { { (uint8_t*)N, (uint8_t*)V, sizeof(N) - 1, sizeof(V) - 1, 0 }, \
NH, VH, 1, NGHTTP2_HD_FLAG_NONE }, I }
/* Sorted by hash(name) and its table index */
static nghttp2_hd_static_entry static_table[] = {
MAKE_STATIC_ENT(20, "age", "", 96511u, 0u),
MAKE_STATIC_ENT(59, "via", "", 116750u, 0u),
MAKE_STATIC_ENT(32, "date", "", 3076014u, 0u),
MAKE_STATIC_ENT(33, "etag", "", 3123477u, 0u),
MAKE_STATIC_ENT(36, "from", "", 3151786u, 0u),
MAKE_STATIC_ENT(37, "host", "", 3208616u, 0u),
MAKE_STATIC_ENT(44, "link", "", 3321850u, 0u),
MAKE_STATIC_ENT(58, "vary", "", 3612210u, 0u),
MAKE_STATIC_ENT(38, "if-match", "", 34533653u, 0u),
MAKE_STATIC_ENT(41, "if-range", "", 39145613u, 0u),
MAKE_STATIC_ENT(3, ":path", "/", 56997727u, 47u),
MAKE_STATIC_ENT(4, ":path", "/index.html", 56997727u, 2144181430u),
MAKE_STATIC_ENT(21, "allow", "", 92906313u, 0u),
MAKE_STATIC_ENT(49, "range", "", 108280125u, 0u),
MAKE_STATIC_ENT(14, "accept-charset", "", 124285319u, 0u),
MAKE_STATIC_ENT(43, "last-modified", "", 150043680u, 0u),
MAKE_STATIC_ENT(48, "proxy-authorization", "", 329532250u, 0u),
MAKE_STATIC_ENT(57, "user-agent", "", 486342275u, 0u),
MAKE_STATIC_ENT(40, "if-none-match", "", 646073760u, 0u),
MAKE_STATIC_ENT(30, "content-type", "", 785670158u, 0u),
MAKE_STATIC_ENT(16, "accept-language", "", 802785917u, 0u),
MAKE_STATIC_ENT(50, "referer", "", 1085069613u, 0u),
MAKE_STATIC_ENT(51, "refresh", "", 1085444827u, 0u),
MAKE_STATIC_ENT(55, "strict-transport-security", "", 1153852136u, 0u),
MAKE_STATIC_ENT(54, "set-cookie", "", 1237214767u, 0u),
MAKE_STATIC_ENT(56, "transfer-encoding", "", 1274458357u, 0u),
MAKE_STATIC_ENT(17, "accept-ranges", "", 1397189435u, 0u),
MAKE_STATIC_ENT(42, "if-unmodified-since", "", 1454068927u, 0u),
MAKE_STATIC_ENT(46, "max-forwards", "", 1619948695u, 0u),
MAKE_STATIC_ENT(45, "location", "", 1901043637u, 0u),
MAKE_STATIC_ENT(52, "retry-after", "", 1933352567u, 0u),
MAKE_STATIC_ENT(25, "content-encoding", "", 2095084583u, 0u),
MAKE_STATIC_ENT(28, "content-location", "", 2284906121u, 0u),
MAKE_STATIC_ENT(39, "if-modified-since", "", 2302095846u, 0u),
MAKE_STATIC_ENT(18, "accept", "", 2871506184u, 0u),
MAKE_STATIC_ENT(29, "content-range", "", 2878374633u, 0u),
MAKE_STATIC_ENT(22, "authorization", "", 2909397113u, 0u),
MAKE_STATIC_ENT(31, "cookie", "", 2940209764u, 0u),
MAKE_STATIC_ENT(0, ":authority", "", 2962729033u, 0u),
MAKE_STATIC_ENT(35, "expires", "", 2985731892u, 0u),
MAKE_STATIC_ENT(34, "expect", "", 3005803609u, 0u),
MAKE_STATIC_ENT(24, "content-disposition", "", 3027699811u, 0u),
MAKE_STATIC_ENT(26, "content-language", "", 3065240108u, 0u),
MAKE_STATIC_ENT(1, ":method", "GET", 3153018267u, 70454u),
MAKE_STATIC_ENT(2, ":method", "POST", 3153018267u, 2461856u),
MAKE_STATIC_ENT(27, "content-length", "", 3162187450u, 0u),
MAKE_STATIC_ENT(19, "access-control-allow-origin", "", 3297999203u, 0u),
MAKE_STATIC_ENT(5, ":scheme", "http", 3322585695u, 3213448u),
MAKE_STATIC_ENT(6, ":scheme", "https", 3322585695u, 99617003u),
MAKE_STATIC_ENT(7, ":status", "200", 3338091692u, 49586u),
MAKE_STATIC_ENT(8, ":status", "204", 3338091692u, 49590u),
MAKE_STATIC_ENT(9, ":status", "206", 3338091692u, 49592u),
MAKE_STATIC_ENT(10, ":status", "304", 3338091692u, 50551u),
MAKE_STATIC_ENT(11, ":status", "400", 3338091692u, 51508u),
MAKE_STATIC_ENT(12, ":status", "404", 3338091692u, 51512u),
MAKE_STATIC_ENT(13, ":status", "500", 3338091692u, 52469u),
MAKE_STATIC_ENT(53, "server", "", 3389140803u, 0u),
MAKE_STATIC_ENT(47, "proxy-authenticate", "", 3993199572u, 0u),
MAKE_STATIC_ENT(60, "www-authenticate", "", 4051929931u, 0u),
MAKE_STATIC_ENT(23, "cache-control", "", 4086191634u, 0u),
MAKE_STATIC_ENT(15, "accept-encoding", "", 4127597688u, 0u),
};
/* Index to the position in static_table */
const size_t static_table_index[] = {
38, 43, 44, 10, 11, 47, 48, 49, 50, 51, 52, 53, 54, 55, 14, 60,
20, 26, 34, 46, 0 , 12, 36, 59, 41, 31, 42, 45, 32, 35, 19, 37,
2 , 3 , 40, 39, 4 , 5 , 8 , 33, 18, 9 , 27, 15, 6 , 29, 28, 57,
16, 13, 21, 22, 30, 56, 24, 23, 25, 17, 7 , 1 , 58
};
static const size_t STATIC_TABLE_LENGTH =
sizeof(static_table)/sizeof(static_table[0]);
static int memeq(const void *s1, const void *s2, size_t n)
{
const uint8_t *a = (const uint8_t*)s1, *b = (const uint8_t*)s2;
uint8_t c = 0;
while(n > 0) {
c |= (*a++) ^ (*b++);
--n;
}
return c == 0;
}
static uint32_t hash(const uint8_t *s, size_t n)
{
uint32_t h = 0;
while(n > 0) {
h = h * 31 + *s++;
--n;
}
return h;
}
typedef struct {
nghttp2_nv *nva;
size_t nvacap;
size_t nvlen;
} nghttp2_nva_out;
int nghttp2_hd_entry_init(nghttp2_hd_entry *ent, uint8_t flags,
uint8_t *name, size_t namelen,
uint8_t *value, size_t valuelen)
{
int rv = 0;
/* Since nghttp2_hd_entry is used for indexing, ent->nv.flags always
NGHTTP2_NV_FLAG_NONE */
ent->nv.flags = NGHTTP2_NV_FLAG_NONE;
if((flags & NGHTTP2_HD_FLAG_NAME_ALLOC) &&
(flags & NGHTTP2_HD_FLAG_NAME_GIFT) == 0) {
if(namelen == 0) {
/* We should not allow empty header field name */
ent->nv.name = NULL;
} else {
ent->nv.name = nghttp2_memdup(name, namelen);
if(ent->nv.name == NULL) {
rv = NGHTTP2_ERR_NOMEM;
goto fail;
}
}
} else {
ent->nv.name = name;
}
if((flags & NGHTTP2_HD_FLAG_VALUE_ALLOC) &&
(flags & NGHTTP2_HD_FLAG_VALUE_GIFT) == 0) {
if(valuelen == 0) {
ent->nv.value = NULL;
} else {
ent->nv.value = nghttp2_memdup(value, valuelen);
if(ent->nv.value == NULL) {
rv = NGHTTP2_ERR_NOMEM;
goto fail2;
}
}
} else {
ent->nv.value = value;
}
ent->nv.namelen = namelen;
ent->nv.valuelen = valuelen;
ent->ref = 1;
ent->flags = flags;
if(ent->nv.name) {
ent->name_hash = hash(ent->nv.name, ent->nv.namelen);
} else {
ent->name_hash = 0;
}
if(ent->nv.value) {
ent->value_hash = hash(ent->nv.value, ent->nv.valuelen);
} else {
ent->value_hash = 0;
}
return 0;
fail2:
if(flags & NGHTTP2_HD_FLAG_NAME_ALLOC) {
free(ent->nv.name);
}
fail:
return rv;
}
void nghttp2_hd_entry_free(nghttp2_hd_entry *ent)
{
assert(ent->ref == 0);
if(ent->flags & NGHTTP2_HD_FLAG_NAME_ALLOC) {
free(ent->nv.name);
}
if(ent->flags & NGHTTP2_HD_FLAG_VALUE_ALLOC) {
free(ent->nv.value);
}
}
static int hd_ringbuf_init(nghttp2_hd_ringbuf *ringbuf, size_t bufsize)
{
size_t size;
for(size = 1; size < bufsize; size <<= 1);
ringbuf->buffer = malloc(sizeof(nghttp2_hd_entry*)*size);
if(ringbuf->buffer == NULL) {
return NGHTTP2_ERR_NOMEM;
}
ringbuf->mask = size - 1;
ringbuf->first = 0;
ringbuf->len = 0;
return 0;
}
static nghttp2_hd_entry* hd_ringbuf_get(nghttp2_hd_ringbuf *ringbuf,
size_t idx)
{
assert(idx < ringbuf->len);
return ringbuf->buffer[(ringbuf->first + idx) & ringbuf->mask];
}
static int hd_ringbuf_reserve(nghttp2_hd_ringbuf *ringbuf, size_t bufsize)
{
size_t i;
size_t size;
nghttp2_hd_entry **buffer;
if(ringbuf->mask + 1 >= bufsize) {
return 0;
}
for(size = 1; size < bufsize; size <<= 1);
buffer = malloc(sizeof(nghttp2_hd_entry*) * size);
if(buffer == NULL) {
return NGHTTP2_ERR_NOMEM;
}
for(i = 0; i < ringbuf->len; ++i) {
buffer[i] = hd_ringbuf_get(ringbuf, i);
}
free(ringbuf->buffer);
ringbuf->buffer = buffer;
ringbuf->mask = size - 1;
ringbuf->first = 0;
return 0;
}
static void hd_ringbuf_free(nghttp2_hd_ringbuf *ringbuf)
{
size_t i;
if(ringbuf == NULL) {
return;
}
for(i = 0; i < ringbuf->len; ++i) {
nghttp2_hd_entry *ent = hd_ringbuf_get(ringbuf, i);
--ent->ref;
nghttp2_hd_entry_free(ent);
free(ent);
}
free(ringbuf->buffer);
}
static size_t hd_ringbuf_push_front(nghttp2_hd_ringbuf *ringbuf,
nghttp2_hd_entry *ent)
{
assert(ringbuf->len <= ringbuf->mask);
ringbuf->buffer[--ringbuf->first & ringbuf->mask] = ent;
++ringbuf->len;
return 0;
}
static void hd_ringbuf_pop_back(nghttp2_hd_ringbuf *ringbuf)
{
assert(ringbuf->len > 0);
--ringbuf->len;
}
static int hd_context_init(nghttp2_hd_context *context,
nghttp2_hd_role role)
{
int rv;
context->role = role;
context->bad = 0;
context->hd_table_bufsize_max = NGHTTP2_HD_DEFAULT_MAX_BUFFER_SIZE;
rv = hd_ringbuf_init
(&context->hd_table,
context->hd_table_bufsize_max/NGHTTP2_HD_ENTRY_OVERHEAD);
if(rv != 0) {
return rv;
}
context->hd_table_bufsize = 0;
return 0;
}
static void hd_context_free(nghttp2_hd_context *context)
{
hd_ringbuf_free(&context->hd_table);
}
int nghttp2_hd_deflate_init(nghttp2_hd_deflater *deflater)
{
return nghttp2_hd_deflate_init2(deflater,
NGHTTP2_HD_DEFAULT_MAX_DEFLATE_BUFFER_SIZE);
}
int nghttp2_hd_deflate_init2(nghttp2_hd_deflater *deflater,
size_t deflate_hd_table_bufsize_max)
{
int rv;
rv = hd_context_init(&deflater->ctx, NGHTTP2_HD_ROLE_DEFLATE);
if(rv != 0) {
return rv;
}
deflater->no_refset = 0;
if(deflate_hd_table_bufsize_max < NGHTTP2_HD_DEFAULT_MAX_BUFFER_SIZE) {
deflater->notify_table_size_change = 1;
deflater->ctx.hd_table_bufsize_max = deflate_hd_table_bufsize_max;
} else {
deflater->notify_table_size_change = 0;
}
deflater->deflate_hd_table_bufsize_max = deflate_hd_table_bufsize_max;
return 0;
}
int nghttp2_hd_inflate_init(nghttp2_hd_inflater *inflater)
{
int rv;
rv = hd_context_init(&inflater->ctx, NGHTTP2_HD_ROLE_INFLATE);
if(rv != 0) {
goto fail;
}
inflater->settings_hd_table_bufsize_max =
NGHTTP2_HD_DEFAULT_MAX_BUFFER_SIZE;
inflater->ent_keep = NULL;
inflater->nv_keep = NULL;
inflater->end_headers_index = 0;
inflater->opcode = NGHTTP2_HD_OPCODE_NONE;
inflater->state = NGHTTP2_HD_STATE_OPCODE;
rv = nghttp2_bufs_init(&inflater->nvbufs, NGHTTP2_HD_MAX_NV / 2, 2);
if(rv != 0) {
goto nvbufs_fail;
}
inflater->huffman_encoded = 0;
inflater->index = 0;
inflater->left = 0;
inflater->newnamelen = 0;
inflater->index_required = 0;
inflater->no_index = 0;
inflater->ent_name = NULL;
return 0;
nvbufs_fail:
hd_context_free(&inflater->ctx);
fail:
return rv;
}
static void hd_inflate_keep_free(nghttp2_hd_inflater *inflater)
{
if(inflater->ent_keep) {
if(inflater->ent_keep->ref == 0) {
nghttp2_hd_entry_free(inflater->ent_keep);
free(inflater->ent_keep);
}
inflater->ent_keep = NULL;
}
free(inflater->nv_keep);
inflater->nv_keep = NULL;
}
void nghttp2_hd_deflate_free(nghttp2_hd_deflater *deflater)
{
hd_context_free(&deflater->ctx);
}
void nghttp2_hd_inflate_free(nghttp2_hd_inflater *inflater)
{
hd_inflate_keep_free(inflater);
nghttp2_bufs_free(&inflater->nvbufs);
hd_context_free(&inflater->ctx);
}
void nghttp2_hd_deflate_set_no_refset(nghttp2_hd_deflater *deflater,
uint8_t no_refset)
{
deflater->no_refset = no_refset;
}
static size_t entry_room(size_t namelen, size_t valuelen)
{
return NGHTTP2_HD_ENTRY_OVERHEAD + namelen + valuelen;
}
static int emit_indexed_header(nghttp2_nv *nv_out, nghttp2_hd_entry *ent)
{
DEBUGF(fprintf(stderr, "inflatehd: header emission: "));
DEBUGF(fwrite(ent->nv.name, ent->nv.namelen, 1, stderr));
DEBUGF(fprintf(stderr, ": "));
DEBUGF(fwrite(ent->nv.value, ent->nv.valuelen, 1, stderr));
DEBUGF(fprintf(stderr, "\n"));
/* ent->ref may be 0. This happens if the careless stupid encoder
emits literal block larger than header table capacity with
indexing. */
ent->flags |= NGHTTP2_HD_FLAG_EMIT;
*nv_out = ent->nv;
return 0;
}
static int emit_literal_header(nghttp2_nv *nv_out, nghttp2_nv *nv)
{
DEBUGF(fprintf(stderr, "inflatehd: header emission: "));
DEBUGF(fwrite(nv->name, nv->namelen, 1, stderr));
DEBUGF(fprintf(stderr, ": "));
DEBUGF(fwrite(nv->value, nv->valuelen, 1, stderr));
DEBUGF(fprintf(stderr, "\n"));
*nv_out = *nv;
return 0;
}
static size_t count_encoded_length(size_t n, size_t prefix)
{
size_t k = (1 << prefix) - 1;
size_t len = 0;
if(n >= k) {
n -= k;
++len;
} else {
return 1;
}
do {
++len;
if(n >= 128) {
n >>= 7;
} else {
break;
}
} while(n);
return len;
}
static size_t encode_length(uint8_t *buf, size_t n, size_t prefix)
{
size_t k = (1 << prefix) - 1;
size_t len = 0;
*buf &= ~k;
if(n >= k) {
*buf++ |= k;
n -= k;
++len;
} else {
*buf++ |= n;
return 1;
}
do {
++len;
if(n >= 128) {
*buf++ = (1 << 7) | (n & 0x7f);
n >>= 7;
} else {
*buf++ = n;
break;
}
} while(n);
return len;
}
/*
* Decodes |prefx| prefixed integer stored from |in|. The |last|
* represents the 1 beyond the last of the valid contiguous memory
* region from |in|. The decoded integer must be strictly less than 1
* << 16.
*
* If the |initial| is nonzero, it is used as a initial value, this
* function assumes the |in| starts with intermediate data.
*
* An entire integer is decoded successfully, decoded, the |*final| is
* set to nonzero.
*
* This function returns the next byte of read byte. This function
* stores the decoded integer in |*res| if it succeed, including
* partial decoding, or stores -1 in |*res|, indicating decoding
* error.
*/
static uint8_t* decode_length(ssize_t *res, int *final, ssize_t initial,
uint8_t *in, uint8_t *last, size_t prefix)
{
int k = (1 << prefix) - 1, r;
ssize_t n = initial;
*final = 0;
if(n == 0) {
if((*in & k) == k) {
n = k;
} else {
*res = (*in) & k;
*final = 1;
return in + 1;
}
if(++in == last) {
*res = n;
return in;
}
}
for(r = 0; in != last; ++in, r += 7) {
n += (*in & 0x7f) << r;
if(n >= (1 << 16)) {
*res = -1;
return in + 1;
}
if((*in & (1 << 7)) == 0) {
break;
}
}
if(in == last) {
*res = n;
return in;
}
if(*in & (1 << 7)) {
*res = -1;
return in + 1;
}
*res = n;
*final = 1;
return in + 1;
}
static int emit_clear_refset(nghttp2_bufs *bufs)
{
int rv;
DEBUGF(fprintf(stderr, "deflatehd: emit clear refset\n"));
rv = nghttp2_bufs_addb(bufs, 0x30u);
if(rv != 0) {
return rv;
}
return 0;
}
static int emit_table_size(nghttp2_bufs *bufs, size_t table_size)
{
int rv;
uint8_t *bufp;
size_t blocklen;
uint8_t sb[16];
DEBUGF(fprintf(stderr, "deflatehd: emit table_size=%zu\n", table_size));
blocklen = count_encoded_length(table_size, 4);
if(sizeof(sb) < blocklen) {
return NGHTTP2_ERR_HEADER_COMP;
}
bufp = sb;
*bufp = 0x20u;
encode_length(bufp, table_size, 4);
rv = nghttp2_bufs_add(bufs, sb, blocklen);
if(rv != 0) {
return rv;
}
return 0;
}
static int emit_indexed_block(nghttp2_bufs *bufs, size_t idx)
{
int rv;
size_t blocklen;
uint8_t sb[16];
uint8_t *bufp;
blocklen = count_encoded_length(idx + 1, 7);
DEBUGF(fprintf(stderr, "deflatehd: emit indexed index=%zu, %zu bytes\n",
idx, blocklen));
if(sizeof(sb) < blocklen) {
return NGHTTP2_ERR_HEADER_COMP;
}
bufp = sb;
*bufp = 0x80u;
encode_length(bufp, idx + 1, 7);
rv = nghttp2_bufs_add(bufs, sb, blocklen);
if(rv != 0) {
return rv;
}
return 0;
}
static int emit_string(nghttp2_bufs *bufs,
size_t enclen, int huffman,
const uint8_t *str, size_t len)
{
int rv;
uint8_t sb[16];
uint8_t *bufp;
size_t blocklen;
blocklen = count_encoded_length(enclen, 7);
DEBUGF(fprintf(stderr,
"deflatehd: emit string str="));
DEBUGF(fwrite(str, len, 1, stderr));
DEBUGF(fprintf(stderr, ", length=%zu, huffman=%d, encoded_length=%zu\n",
len, huffman, enclen));
if(sizeof(sb) < blocklen) {
return NGHTTP2_ERR_HEADER_COMP;
}
bufp = sb;
*bufp = huffman ? 1 << 7 : 0;
encode_length(bufp, enclen, 7);
rv = nghttp2_bufs_add(bufs, sb, blocklen);
if(rv != 0) {
return rv;
}
if(huffman) {
rv = nghttp2_hd_huff_encode(bufs, str, len);
} else {
assert(enclen == len);
rv = nghttp2_bufs_add(bufs, str, len);
}
return rv;
}
static uint8_t pack_first_byte(int inc_indexing, int no_index)
{
if(inc_indexing) {
return 0x40u;
}
if(no_index) {
return 0x10u;
}
return 0;
}
static int emit_indname_block(nghttp2_bufs *bufs, size_t idx,
nghttp2_nv *nv,
int inc_indexing)
{
int rv;
uint8_t *bufp;
size_t encvallen;
size_t blocklen;
int huffman;
uint8_t sb[16];
size_t prefixlen;
int no_index;
no_index = (nv->flags & NGHTTP2_NV_FLAG_NO_INDEX) != 0;
if(inc_indexing) {
prefixlen = 6;
} else {
prefixlen = 4;
}
DEBUGF(fprintf(stderr,
"deflatehd: emit indname index=%zu, valuelen=%zu, "
"indexing=%d, no_index=%d\n",
idx, nv->valuelen, inc_indexing, no_index));
encvallen = nghttp2_hd_huff_encode_count(nv->value, nv->valuelen);
blocklen = count_encoded_length(idx + 1, prefixlen);
huffman = encvallen < nv->valuelen;
if(!huffman) {
encvallen = nv->valuelen;
}
if(sizeof(sb) < blocklen) {
return NGHTTP2_ERR_HEADER_COMP;
}
bufp = sb;
*bufp = pack_first_byte(inc_indexing, no_index);
encode_length(bufp, idx + 1, prefixlen);
rv = nghttp2_bufs_add(bufs, sb, blocklen);
if(rv != 0) {
return rv;
}
rv = emit_string(bufs, encvallen, huffman, nv->value, nv->valuelen);
if(rv != 0) {
return rv;
}
return 0;
}
static int emit_newname_block(nghttp2_bufs *bufs, nghttp2_nv *nv,
int inc_indexing)
{
int rv;
size_t encnamelen;
size_t encvallen;
int name_huffman;
int value_huffman;
int no_index;
no_index = (nv->flags & NGHTTP2_NV_FLAG_NO_INDEX) != 0;
DEBUGF(fprintf(stderr,
"deflatehd: emit newname namelen=%zu, valuelen=%zu, "
"indexing=%d, no_index=%d\n",
nv->namelen, nv->valuelen, inc_indexing, no_index));
encnamelen = nghttp2_hd_huff_encode_count(nv->name, nv->namelen);
encvallen = nghttp2_hd_huff_encode_count(nv->value, nv->valuelen);
name_huffman = encnamelen < nv->namelen;
value_huffman = encvallen < nv->valuelen;
if(!name_huffman) {
encnamelen = nv->namelen;
}
if(!value_huffman) {
encvallen = nv->valuelen;
}
rv = nghttp2_bufs_addb(bufs, pack_first_byte(inc_indexing, no_index));
if(rv != 0) {
return rv;
}
rv = emit_string(bufs, encnamelen, name_huffman, nv->name, nv->namelen);
if(rv != 0) {
return rv;
}
rv = emit_string(bufs, encvallen, value_huffman, nv->value, nv->valuelen);
if(rv != 0) {
return rv;
}
return 0;
}
/*
* Emit common header with |index| by toggle off and on (thus 2
* indexed representation emissions).
*/
static int emit_implicit(nghttp2_bufs *bufs, size_t idx)
{
int i, rv;
for(i = 0; i < 2; ++i) {
rv = emit_indexed_block(bufs, idx);
if(rv != 0) {
return rv;
}
}
return 0;
}
static nghttp2_hd_entry* add_hd_table_incremental(nghttp2_hd_context *context,
nghttp2_bufs *bufs,
nghttp2_nv *nv,
uint8_t entry_flags)
{
int rv;
nghttp2_hd_entry *new_ent;
size_t room;
room = entry_room(nv->namelen, nv->valuelen);
while(context->hd_table_bufsize + room > context->hd_table_bufsize_max &&
context->hd_table.len > 0) {
size_t idx = context->hd_table.len - 1;
nghttp2_hd_entry* ent = hd_ringbuf_get(&context->hd_table, idx);
context->hd_table_bufsize -= entry_room(ent->nv.namelen, ent->nv.valuelen);
if(context->role == NGHTTP2_HD_ROLE_DEFLATE) {
if(ent->flags & NGHTTP2_HD_FLAG_IMPLICIT_EMIT) {
/* Emit common header just before it slips away from the
table. If we don't do this, we have to emit it in literal
representation which hurts compression. */
rv = emit_implicit(bufs, idx);
if(rv != 0) {
return NULL;
}
}
}
DEBUGF(fprintf(stderr, "hpack: remove item from header table: "));
DEBUGF(fwrite(ent->nv.name, ent->nv.namelen, 1, stderr));
DEBUGF(fprintf(stderr, ": "));
DEBUGF(fwrite(ent->nv.value, ent->nv.valuelen, 1, stderr));
DEBUGF(fprintf(stderr, "\n"));
hd_ringbuf_pop_back(&context->hd_table);
if(--ent->ref == 0) {
nghttp2_hd_entry_free(ent);
free(ent);
}
}
new_ent = malloc(sizeof(nghttp2_hd_entry));
if(new_ent == NULL) {
return NULL;
}
rv = nghttp2_hd_entry_init(new_ent, entry_flags,
nv->name, nv->namelen, nv->value, nv->valuelen);
if(rv != 0) {
free(new_ent);
return NULL;
}
if(room > context->hd_table_bufsize_max) {
/* The entry taking more than NGHTTP2_HD_MAX_BUFFER_SIZE is
immediately evicted. */
--new_ent->ref;
} else {
context->hd_table_bufsize += room;
hd_ringbuf_push_front(&context->hd_table, new_ent);
new_ent->flags |= NGHTTP2_HD_FLAG_REFSET;
}
return new_ent;
}
static int name_eq(const nghttp2_nv *a, const nghttp2_nv *b)
{
return a->namelen == b->namelen && memeq(a->name, b->name, a->namelen);
}
static int value_eq(const nghttp2_nv *a, const nghttp2_nv *b)
{
return a->valuelen == b->valuelen && memeq(a->value, b->value, a->valuelen);
}
typedef struct {
ssize_t index;
/* Nonzero if both name and value are matched. */
uint8_t name_value_match;
} search_result;
static search_result search_hd_table(nghttp2_hd_context *context,
nghttp2_nv *nv)
{
search_result res = { -1, 0 };
size_t i;
uint32_t name_hash = hash(nv->name, nv->namelen);
uint32_t value_hash = hash(nv->value, nv->valuelen);
ssize_t left = -1, right = STATIC_TABLE_LENGTH;
int use_index = (nv->flags & NGHTTP2_NV_FLAG_NO_INDEX) == 0;
if(use_index) {
for(i = 0; i < context->hd_table.len; ++i) {
nghttp2_hd_entry *ent = hd_ringbuf_get(&context->hd_table, i);
if(ent->name_hash == name_hash && name_eq(&ent->nv, nv)) {
if(res.index == -1) {
res.index = i;
}
if(ent->value_hash == value_hash && value_eq(&ent->nv, nv)) {
res.index = i;
res.name_value_match = 1;
return res;
}
}
}
}
while(right - left > 1) {
ssize_t mid = (left + right) / 2;
nghttp2_hd_entry *ent = &static_table[mid].ent;
if(ent->name_hash < name_hash) {
left = mid;
} else {
right = mid;
}
}
for(i = right; i < STATIC_TABLE_LENGTH; ++i) {
nghttp2_hd_entry *ent = &static_table[i].ent;
if(ent->name_hash != name_hash) {
break;
}
if(name_eq(&ent->nv, nv)) {
if(res.index == -1) {
res.index = context->hd_table.len + static_table[i].index;
}
if(use_index &&
ent->value_hash == value_hash && value_eq(&ent->nv, nv)) {
res.index = context->hd_table.len + static_table[i].index;
res.name_value_match = 1;
return res;
}
}
}
return res;
}
static void hd_context_shrink_table_size(nghttp2_hd_context *context)
{
while(context->hd_table_bufsize > context->hd_table_bufsize_max &&
context->hd_table.len > 0) {
size_t idx = context->hd_table.len - 1;
nghttp2_hd_entry* ent = hd_ringbuf_get(&context->hd_table, idx);
context->hd_table_bufsize -= entry_room(ent->nv.namelen, ent->nv.valuelen);
hd_ringbuf_pop_back(&context->hd_table);
if(--ent->ref == 0) {
nghttp2_hd_entry_free(ent);
free(ent);
}
}
}
int nghttp2_hd_deflate_change_table_size(nghttp2_hd_deflater *deflater,
size_t settings_hd_table_bufsize_max)
{
int rv;
size_t next_bufsize = nghttp2_min(settings_hd_table_bufsize_max,
deflater->deflate_hd_table_bufsize_max);
rv = hd_ringbuf_reserve
(&deflater->ctx.hd_table, next_bufsize / NGHTTP2_HD_ENTRY_OVERHEAD);
if(rv != 0) {
return rv;
}
deflater->ctx.hd_table_bufsize_max = next_bufsize;
deflater->notify_table_size_change = 1;
hd_context_shrink_table_size(&deflater->ctx);
return 0;
}
int nghttp2_hd_inflate_change_table_size(nghttp2_hd_inflater *inflater,
size_t settings_hd_table_bufsize_max)
{
int rv;
rv = hd_ringbuf_reserve
(&inflater->ctx.hd_table,
settings_hd_table_bufsize_max / NGHTTP2_HD_ENTRY_OVERHEAD);
if(rv != 0) {
return rv;
}
inflater->settings_hd_table_bufsize_max = settings_hd_table_bufsize_max;
inflater->ctx.hd_table_bufsize_max = settings_hd_table_bufsize_max;
hd_context_shrink_table_size(&inflater->ctx);
return 0;
}
static void clear_refset(nghttp2_hd_context *context)
{
size_t i;
for(i = 0; i < context->hd_table.len; ++i) {
nghttp2_hd_entry *ent = hd_ringbuf_get(&context->hd_table, i);
ent->flags &= ~NGHTTP2_HD_FLAG_REFSET;
}
}
static int check_index_range(nghttp2_hd_context *context, size_t idx)
{
return idx < context->hd_table.len + STATIC_TABLE_LENGTH;
}
static size_t get_max_index(nghttp2_hd_context *context)
{
return context->hd_table.len + STATIC_TABLE_LENGTH - 1;
}
nghttp2_hd_entry* nghttp2_hd_table_get(nghttp2_hd_context *context,
size_t idx)
{
assert(check_index_range(context, idx));
if(idx < context->hd_table.len) {
return hd_ringbuf_get(&context->hd_table, idx);
} else {
return
&static_table[static_table_index[idx - context->hd_table.len]].ent;
}
}
#define name_match(NV, NAME) \
(nv->namelen == sizeof(NAME) - 1 && memeq(nv->name, NAME, sizeof(NAME) - 1))
static int hd_deflate_should_indexing(nghttp2_hd_deflater *deflater,
const nghttp2_nv *nv)
{
if((nv->flags & NGHTTP2_NV_FLAG_NO_INDEX) ||
entry_room(nv->namelen, nv->valuelen) >
deflater->ctx.hd_table_bufsize_max * 3 / 4) {
return 0;
}
#ifdef NGHTTP2_XHD
return !name_match(nv, NGHTTP2_XHD);
#else /* !NGHTTP2_XHD */
return
!name_match(nv, "set-cookie") &&
!name_match(nv, "content-length") &&
!name_match(nv, "location") &&
!name_match(nv, "etag") &&
!name_match(nv, ":path");
#endif /* !NGHTTP2_XHD */
}
static int deflate_nv(nghttp2_hd_deflater *deflater,
nghttp2_bufs *bufs, nghttp2_nv *nv)
{
int rv;
nghttp2_hd_entry *ent;
search_result res;
DEBUGF(fprintf(stderr, "deflatehd: deflating "));
DEBUGF(fwrite(nv->name, nv->namelen, 1, stderr));
DEBUGF(fprintf(stderr, ": "));
DEBUGF(fwrite(nv->value, nv->valuelen, 1, stderr));
DEBUGF(fprintf(stderr, "\n"));
res = search_hd_table(&deflater->ctx, nv);
if(res.index != -1 && res.name_value_match) {
size_t idx = res.index;
DEBUGF(fprintf(stderr, "deflatehd: name/value match index=%zd\n",
res.index));
ent = nghttp2_hd_table_get(&deflater->ctx, idx);
if(idx >= deflater->ctx.hd_table.len) {
nghttp2_hd_entry *new_ent;
/* It is important to first add entry to the header table and
let eviction go. If NGHTTP2_HD_FLAG_IMPLICIT_EMIT entry is
evicted, it must be emitted before the |nv|. */
new_ent = add_hd_table_incremental(&deflater->ctx, bufs, &ent->nv,
NGHTTP2_HD_FLAG_NONE);
if(!new_ent) {
return NGHTTP2_ERR_HEADER_COMP;
}
if(new_ent->ref == 0) {
nghttp2_hd_entry_free(new_ent);
free(new_ent);
new_ent = NULL;
} else {
/* new_ent->ref > 0 means that new_ent is in the reference
set */
new_ent->flags |= NGHTTP2_HD_FLAG_EMIT;
}
rv = emit_indexed_block(bufs, idx);
if(rv != 0) {
return rv;
}
} else if((ent->flags & NGHTTP2_HD_FLAG_REFSET) == 0) {
ent->flags |= NGHTTP2_HD_FLAG_REFSET | NGHTTP2_HD_FLAG_EMIT;
rv = emit_indexed_block(bufs, idx);
if(rv != 0) {
return rv;
}
} else {
int num_emits = 0;
if(ent->flags & NGHTTP2_HD_FLAG_EMIT) {
/* occurrences of the same indexed representation. Emit index
twice. */
num_emits = 2;
} else if(ent->flags & NGHTTP2_HD_FLAG_IMPLICIT_EMIT) {
/* ent was implicitly emitted because it is the common
header field. To support occurrences of the same indexed
representation, we have to emit 4 times. This is because
"implicitly emitted" means actually not emitted at
all. So first 2 emits performs 1st header appears in the
reference set. And another 2 emits are done for 2nd
(current) header. */
ent->flags ^= NGHTTP2_HD_FLAG_IMPLICIT_EMIT;
ent->flags |= NGHTTP2_HD_FLAG_EMIT;
num_emits = 4;
} else {
/* This is common header and not emitted in the current
run. Just mark IMPLICIT_EMIT, in the hope that we are not
required to emit anything for this. We will emit toggle
off/on for this entry if it is removed from the header
table. */
ent->flags |= NGHTTP2_HD_FLAG_IMPLICIT_EMIT;
}
for(; num_emits > 0; --num_emits) {
rv = emit_indexed_block(bufs, idx);
if(rv != 0) {
return rv;
}
}
}
} else {
ssize_t idx = -1;
int incidx = 0;
if(res.index != -1) {
DEBUGF(fprintf(stderr, "deflatehd: name match index=%zd\n",
res.index));
idx = res.index;
}
if(hd_deflate_should_indexing(deflater, nv)) {
nghttp2_hd_entry *new_ent;
if(idx >= (ssize_t)deflater->ctx.hd_table.len) {
nghttp2_nv nv_indname;
nv_indname = *nv;
nv_indname.name = nghttp2_hd_table_get(&deflater->ctx, idx)->nv.name;
new_ent = add_hd_table_incremental(&deflater->ctx, bufs, &nv_indname,
NGHTTP2_HD_FLAG_VALUE_ALLOC);
} else {
new_ent = add_hd_table_incremental(&deflater->ctx, bufs, nv,
NGHTTP2_HD_FLAG_NAME_ALLOC |
NGHTTP2_HD_FLAG_VALUE_ALLOC);
}
if(!new_ent) {
return NGHTTP2_ERR_HEADER_COMP;
}
if(new_ent->ref == 0) {
nghttp2_hd_entry_free(new_ent);
free(new_ent);
} else {
/* new_ent->ref > 0 means that new_ent is in the reference
set. */
new_ent->flags |= NGHTTP2_HD_FLAG_EMIT;
}
incidx = 1;
}
if(idx == -1) {
rv = emit_newname_block(bufs, nv, incidx);
} else {
rv = emit_indname_block(bufs, idx, nv, incidx);
}
if(rv != 0) {
return rv;
}
}
return 0;
}
static int deflate_post_process_hd_entry(nghttp2_hd_entry *ent,
size_t idx,
nghttp2_bufs *bufs)
{
int rv;
if((ent->flags & NGHTTP2_HD_FLAG_REFSET) &&
(ent->flags & NGHTTP2_HD_FLAG_IMPLICIT_EMIT) == 0 &&
(ent->flags & NGHTTP2_HD_FLAG_EMIT) == 0) {
/* This entry is not present in the current header set and must
be removed. */
ent->flags ^= NGHTTP2_HD_FLAG_REFSET;
rv = emit_indexed_block(bufs, idx);
if(rv != 0) {
return rv;
}
}
ent->flags &= ~(NGHTTP2_HD_FLAG_EMIT | NGHTTP2_HD_FLAG_IMPLICIT_EMIT);
return 0;
}
int nghttp2_hd_deflate_hd_bufs(nghttp2_hd_deflater *deflater,
nghttp2_bufs *bufs,
nghttp2_nv *nv, size_t nvlen)
{
size_t i;
int rv = 0;
if(deflater->ctx.bad) {
return NGHTTP2_ERR_HEADER_COMP;
}
if(deflater->notify_table_size_change) {
deflater->notify_table_size_change = 0;
rv = emit_table_size(bufs, deflater->ctx.hd_table_bufsize_max);
if(rv != 0) {
goto fail;
}
}
if(deflater->no_refset) {
rv = emit_clear_refset(bufs);
if(rv != 0) {
goto fail;
}
clear_refset(&deflater->ctx);
}
for(i = 0; i < nvlen; ++i) {
rv = deflate_nv(deflater, bufs, &nv[i]);
if(rv != 0) {
goto fail;
}
}
DEBUGF(fprintf(stderr,
"deflatehd: all input name/value pairs were deflated\n"));
for(i = 0; i < deflater->ctx.hd_table.len; ++i) {
nghttp2_hd_entry *ent = hd_ringbuf_get(&deflater->ctx.hd_table, i);
rv = deflate_post_process_hd_entry(ent, i, bufs);
if(rv != 0) {
goto fail;
}
}
return 0;
fail:
DEBUGF(fprintf(stderr, "deflatehd: error return %d\n", rv));
deflater->ctx.bad = 1;
return rv;
}
ssize_t nghttp2_hd_deflate_hd(nghttp2_hd_deflater *deflater,
uint8_t *buf, size_t buflen,
nghttp2_nv *nv, size_t nvlen)
{
nghttp2_bufs bufs;
int rv;
rv = nghttp2_bufs_wrap_init(&bufs, buf, buflen);
if(rv != 0) {
return rv;
}
rv = nghttp2_hd_deflate_hd_bufs(deflater, &bufs, nv, nvlen);
buflen = nghttp2_bufs_len(&bufs);
nghttp2_bufs_wrap_free(&bufs);
if(rv == NGHTTP2_ERR_BUFFER_ERROR) {
return NGHTTP2_ERR_INSUFF_BUFSIZE;
}
if(rv != 0) {
return rv;
}
return buflen;
}
size_t nghttp2_hd_deflate_bound(nghttp2_hd_deflater *deflater,
const nghttp2_nv *nva, size_t nvlen)
{
size_t n;
size_t i;
/* Possible Reference Set Emptying */
n = 1;
/* Possible Maximum Header Table Size Change. Encoding (1u << 31) -
1 using 4 bit prefix requires 6 bytes. */
n += 6;
/* Use Literal Header Field without indexing - New Name, since it is
most space consuming format. Also we choose the less one between
non-huffman and huffman, so using literal byte count is
sufficient for upper bound.
Encoding (1u << 31) - 1 using 7 bit prefix requires 6 bytes. We
need 2 of this for |nvlen| header fields. */
n += 6 * 2 * nvlen;
for(i = 0; i < nvlen; ++i) {
n += nva[i].namelen + nva[i].valuelen;
}
/* Add possible reference set toggle off */
n += deflater->ctx.hd_table.len;
return n;
}
int nghttp2_hd_deflate_new(nghttp2_hd_deflater **deflater_ptr,
size_t deflate_hd_table_bufsize_max)
{
*deflater_ptr = malloc(sizeof(nghttp2_hd_deflater));
if(*deflater_ptr == NULL) {
return NGHTTP2_ERR_NOMEM;
}
return nghttp2_hd_deflate_init2(*deflater_ptr, deflate_hd_table_bufsize_max);
}
void nghttp2_hd_deflate_del(nghttp2_hd_deflater *deflater)
{
nghttp2_hd_deflate_free(deflater);
free(deflater);
}
static void hd_inflate_set_huffman_encoded(nghttp2_hd_inflater *inflater,
const uint8_t *in)
{
inflater->huffman_encoded = (*in & (1 << 7)) != 0;
}
/*
* Decodes the integer from the range [in, last). The result is
* assigned to |inflater->left|. If the |inflater->left| is 0, then
* it performs variable integer decoding from scratch. Otherwise, it
* uses the |inflater->left| as the initial value and continues to
* decode assuming that [in, last) begins with intermediary sequence.
*
* This function returns the number of bytes read if it succeeds, or
* one of the following negative error codes:
*
* NGHTTP2_ERR_HEADER_COMP
* Integer decoding failed
*/
static ssize_t hd_inflate_read_len(nghttp2_hd_inflater *inflater,
int *rfin,
uint8_t *in, uint8_t *last,
size_t prefix, size_t maxlen)
{
uint8_t *nin;
*rfin = 0;
nin = decode_length(&inflater->left, rfin, inflater->left, in, last, prefix);
if(inflater->left == -1) {
DEBUGF(fprintf(stderr, "inflatehd: invalid integer\n"));
return NGHTTP2_ERR_HEADER_COMP;
}
if((size_t)inflater->left > maxlen) {
DEBUGF(fprintf(stderr,
"inflatehd: integer exceeded the maximum value %zu\n",
maxlen));
return NGHTTP2_ERR_HEADER_COMP;
}
return nin - in;
}
/*
* Reads |inflater->left| bytes from the range [in, last) and performs
* huffman decoding against them and pushes the result into the
* |buffer|.
*
* This function returns the number of bytes read if it succeeds, or
* one of the following negative error codes:
*
* NGHTTP2_ERR_NOMEM
* Out of memory
* NGHTTP2_ERR_HEADER_COMP
* Huffman decoding failed
* NGHTTP2_ERR_BUFFER_ERROR
* Out of buffer space.
*/
static ssize_t hd_inflate_read_huff(nghttp2_hd_inflater *inflater,
nghttp2_bufs *bufs,
uint8_t *in, uint8_t *last)
{
ssize_t readlen;
int final = 0;
if(last - in >= inflater->left) {
last = in + inflater->left;
final = 1;
}
readlen = nghttp2_hd_huff_decode(&inflater->huff_decode_ctx, bufs,
in, last - in, final);
if(readlen < 0) {
DEBUGF(fprintf(stderr, "inflatehd: huffman decoding failed\n"));
return readlen;
}
inflater->left -= readlen;
return readlen;
}
/*
* Reads |inflater->left| bytes from the range [in, last) and copies
* them into the |buffer|.
*
* This function returns the number of bytes read if it succeeds, or
* one of the following negative error codes:
*
* NGHTTP2_ERR_NOMEM
* Out of memory
* NGHTTP2_ERR_HEADER_COMP
* Header decompression failed
* NGHTTP2_ERR_BUFFER_ERROR
* Out of buffer space.
*/
static ssize_t hd_inflate_read(nghttp2_hd_inflater *inflater,
nghttp2_bufs *bufs,
uint8_t *in, uint8_t *last)
{
int rv;
size_t len = nghttp2_min(last - in, inflater->left);
rv = nghttp2_bufs_add(bufs, in, len);
if(rv != 0) {
return rv;
}
inflater->left -= len;
return len;
}
/*
* Finalize indexed header representation reception. If header is
* emitted, |*nv_out| is filled with that value and 0 is returned. If
* no header is emitted, 1 is returned.
*
* This function returns either 0 or 1 if it succeeds, or one of the
* following negative error codes:
*
* NGHTTP2_ERR_NOMEM
* Out of memory
*/
static int hd_inflate_commit_indexed(nghttp2_hd_inflater *inflater,
nghttp2_nv *nv_out)
{
nghttp2_hd_entry *ent = nghttp2_hd_table_get(&inflater->ctx, inflater->index);
if(inflater->index >= inflater->ctx.hd_table.len) {
nghttp2_hd_entry *new_ent;
new_ent = add_hd_table_incremental(&inflater->ctx, NULL, &ent->nv,
NGHTTP2_HD_FLAG_NONE);
if(!new_ent) {
return NGHTTP2_ERR_NOMEM;
}
/* new_ent->ref == 0 may be hold */
emit_indexed_header(nv_out, new_ent);
inflater->ent_keep = new_ent;
return 0;
}
ent->flags ^= NGHTTP2_HD_FLAG_REFSET;
if(ent->flags & NGHTTP2_HD_FLAG_REFSET) {
emit_indexed_header(nv_out, ent);
return 0;
}
DEBUGF(fprintf(stderr, "inflatehd: toggle off item: "));
DEBUGF(fwrite(ent->nv.name, ent->nv.namelen, 1, stderr));
DEBUGF(fprintf(stderr, ": "));
DEBUGF(fwrite(ent->nv.value, ent->nv.valuelen, 1, stderr));
DEBUGF(fprintf(stderr, "\n"));
return 1;
}
static int hd_inflate_remove_bufs(nghttp2_hd_inflater *inflater,
nghttp2_nv *nv, int value_only)
{
ssize_t rv;
size_t buflen;
uint8_t *buf;
rv = nghttp2_bufs_remove(&inflater->nvbufs, &buf);
if(rv < 0) {
return NGHTTP2_ERR_NOMEM;
}
buflen = rv;
if(value_only) {
nv->name = NULL;
nv->namelen = 0;
} else {
nv->name = buf;
nv->namelen = inflater->newnamelen;
}
nv->value = buf + nv->namelen;
nv->valuelen = buflen - nv->namelen;
return 0;
}
/*
* Finalize literal header representation - new name- reception. If
* header is emitted, |*nv_out| is filled with that value and 0 is
* returned.
*
* This function returns 0 if it succeeds, or one of the following
* negative error codes:
*
* NGHTTP2_ERR_NOMEM
* Out of memory
*/
static int hd_inflate_commit_newname(nghttp2_hd_inflater *inflater,
nghttp2_nv *nv_out)
{
int rv;
nghttp2_nv nv;
rv = hd_inflate_remove_bufs(inflater, &nv, 0 /* name and value */);
if(rv != 0) {
return NGHTTP2_ERR_NOMEM;
}
if(inflater->no_index) {
nv.flags = NGHTTP2_NV_FLAG_NO_INDEX;
} else {
nv.flags = NGHTTP2_NV_FLAG_NONE;
}
if(inflater->index_required) {
nghttp2_hd_entry *new_ent;
uint8_t ent_flags;
/* nv->value points to the middle of the buffer pointed by
nv->name. So we just need to keep track of nv->name for memory
management. */
ent_flags = NGHTTP2_HD_FLAG_NAME_ALLOC | NGHTTP2_HD_FLAG_NAME_GIFT;
new_ent = add_hd_table_incremental(&inflater->ctx, NULL, &nv, ent_flags);
if(new_ent) {
emit_indexed_header(nv_out, new_ent);
inflater->ent_keep = new_ent;
return 0;
}
free(nv.name);
return NGHTTP2_ERR_NOMEM;
}
emit_literal_header(nv_out, &nv);
inflater->nv_keep = nv.name;
return 0;
}
/*
* Finalize literal header representation - indexed name-
* reception. If header is emitted, |*nv_out| is filled with that
* value and 0 is returned.
*
* This function returns 0 if it succeeds, or one of the following
* negative error codes:
*
* NGHTTP2_ERR_NOMEM
* Out of memory
*/
static int hd_inflate_commit_indname(nghttp2_hd_inflater *inflater,
nghttp2_nv *nv_out)
{
int rv;
nghttp2_nv nv;
rv = hd_inflate_remove_bufs(inflater, &nv, 1 /* value only */);
if(rv != 0) {
return NGHTTP2_ERR_NOMEM;
}
if(inflater->no_index) {
nv.flags = NGHTTP2_NV_FLAG_NO_INDEX;
} else {
nv.flags = NGHTTP2_NV_FLAG_NONE;
}
nv.name = inflater->ent_name->nv.name;
nv.namelen = inflater->ent_name->nv.namelen;
if(inflater->index_required) {
nghttp2_hd_entry *new_ent;
uint8_t ent_flags;
int static_name;
ent_flags = NGHTTP2_HD_FLAG_VALUE_ALLOC | NGHTTP2_HD_FLAG_VALUE_GIFT;
static_name = inflater->index >= inflater->ctx.hd_table.len;
if(!static_name) {
ent_flags |= NGHTTP2_HD_FLAG_NAME_ALLOC;
/* For entry in static table, we must not touch ref, because it
is shared by threads */
++inflater->ent_name->ref;
}
new_ent = add_hd_table_incremental(&inflater->ctx, NULL, &nv, ent_flags);
if(!static_name && --inflater->ent_name->ref == 0) {
nghttp2_hd_entry_free(inflater->ent_name);
free(inflater->ent_name);
}
inflater->ent_name = NULL;
if(new_ent) {
emit_indexed_header(nv_out, new_ent);
inflater->ent_keep = new_ent;
return 0;
}
free(nv.value);
return NGHTTP2_ERR_NOMEM;
}
emit_literal_header(nv_out, &nv);
inflater->nv_keep = nv.value;
return 0;
}
ssize_t nghttp2_hd_inflate_hd(nghttp2_hd_inflater *inflater,
nghttp2_nv *nv_out, int *inflate_flags,
uint8_t *in, size_t inlen, int in_final)
{
ssize_t rv = 0;
uint8_t *first = in;
uint8_t *last = in + inlen;
int rfin = 0;
if(inflater->ctx.bad) {
return NGHTTP2_ERR_HEADER_COMP;
}
DEBUGF(fprintf(stderr, "inflatehd: start state=%d\n",
inflater->state));
hd_inflate_keep_free(inflater);
*inflate_flags = NGHTTP2_HD_INFLATE_NONE;
for(; in != last;) {
switch(inflater->state) {
case NGHTTP2_HD_STATE_OPCODE:
if((*in & 0xf0u) == 0x20u) {
DEBUGF(fprintf(stderr, "inflatehd: header table size change\n"));
inflater->opcode = NGHTTP2_HD_OPCODE_INDEXED;
inflater->state = NGHTTP2_HD_STATE_READ_TABLE_SIZE;
} else if((*in & 0xf0u) == 0x30u) {
if(*in != 0x30u) {
rv = NGHTTP2_ERR_HEADER_COMP;
goto fail;
}
DEBUGF(fprintf(stderr, "inflatehd: clearing reference set\n"));
inflater->opcode = NGHTTP2_HD_OPCODE_INDEXED;
inflater->state = NGHTTP2_HD_STATE_CLEAR_REFSET;
++in;
} else if(*in & 0x80u) {
DEBUGF(fprintf(stderr, "inflatehd: indexed repr\n"));
inflater->opcode = NGHTTP2_HD_OPCODE_INDEXED;
inflater->state = NGHTTP2_HD_STATE_READ_INDEX;
} else {
if(*in == 0x40u || *in == 0 || *in == 0x10u) {
DEBUGF(fprintf(stderr,
"inflatehd: literal header repr - new name\n"));
inflater->opcode = NGHTTP2_HD_OPCODE_NEWNAME;
inflater->state = NGHTTP2_HD_STATE_NEWNAME_CHECK_NAMELEN;
} else {
DEBUGF(fprintf(stderr,
"inflatehd: literal header repr - indexed name\n"));
inflater->opcode = NGHTTP2_HD_OPCODE_INDNAME;
inflater->state = NGHTTP2_HD_STATE_READ_INDEX;
}
inflater->index_required = (*in & 0x40) != 0;
inflater->no_index = (*in & 0x10u) != 0;
DEBUGF(fprintf(stderr,
"inflatehd: indexing required=%d, no_index=%d\n",
inflater->index_required,
inflater->no_index));
if(inflater->opcode == NGHTTP2_HD_OPCODE_NEWNAME) {
++in;
}
}
inflater->left = 0;
break;
case NGHTTP2_HD_STATE_CLEAR_REFSET:
clear_refset(&inflater->ctx);
inflater->state = NGHTTP2_HD_STATE_OPCODE;
break;
case NGHTTP2_HD_STATE_READ_TABLE_SIZE:
rfin = 0;
rv = hd_inflate_read_len(inflater, &rfin, in, last, 4,
inflater->settings_hd_table_bufsize_max);
if(rv < 0) {
goto fail;
}
in += rv;
if(!rfin) {
goto almost_ok;
}
DEBUGF(fprintf(stderr, "inflatehd: table_size=%zd\n", inflater->left));
inflater->ctx.hd_table_bufsize_max = inflater->left;
hd_context_shrink_table_size(&inflater->ctx);
inflater->state = NGHTTP2_HD_STATE_OPCODE;
break;
case NGHTTP2_HD_STATE_READ_INDEX: {
size_t prefixlen;
if(inflater->opcode == NGHTTP2_HD_OPCODE_INDEXED) {
prefixlen = 7;
} else if(inflater->index_required) {
prefixlen = 6;
} else {
prefixlen = 4;
}
rfin = 0;
rv = hd_inflate_read_len(inflater, &rfin, in, last, prefixlen,
get_max_index(&inflater->ctx) + 1);
if(rv < 0) {
goto fail;
}
in += rv;
if(inflater->left == 0) {
rv = NGHTTP2_ERR_HEADER_COMP;
goto fail;
}
if(!rfin) {
goto almost_ok;
}
DEBUGF(fprintf(stderr, "inflatehd: index=%zd\n", inflater->left));
if(inflater->opcode == NGHTTP2_HD_OPCODE_INDEXED) {
inflater->index = inflater->left;
assert(inflater->index > 0);
--inflater->index;
rv = hd_inflate_commit_indexed(inflater, nv_out);
if(rv < 0) {
goto fail;
}
inflater->state = NGHTTP2_HD_STATE_OPCODE;
/* If rv == 1, no header was emitted */
if(rv == 0) {
*inflate_flags |= NGHTTP2_HD_INFLATE_EMIT;
return in - first;
}
} else {
inflater->index = inflater->left;
assert(inflater->index > 0);
--inflater->index;
inflater->ent_name = nghttp2_hd_table_get(&inflater->ctx,
inflater->index);
inflater->state = NGHTTP2_HD_STATE_CHECK_VALUELEN;
}
break;
}
case NGHTTP2_HD_STATE_NEWNAME_CHECK_NAMELEN:
hd_inflate_set_huffman_encoded(inflater, in);
inflater->state = NGHTTP2_HD_STATE_NEWNAME_READ_NAMELEN;
inflater->left = 0;
DEBUGF(fprintf(stderr, "inflatehd: huffman encoded=%d\n",
inflater->huffman_encoded != 0));
/* Fall through */
case NGHTTP2_HD_STATE_NEWNAME_READ_NAMELEN:
rfin = 0;
rv = hd_inflate_read_len(inflater, &rfin, in, last, 7,
NGHTTP2_HD_MAX_NV);
if(rv < 0) {
goto fail;
}
in += rv;
if(!rfin) {
DEBUGF(fprintf(stderr,
"inflatehd: integer not fully decoded. current=%zd\n",
inflater->left));
goto almost_ok;
}
if(inflater->huffman_encoded) {
nghttp2_hd_huff_decode_context_init(&inflater->huff_decode_ctx);
inflater->state = NGHTTP2_HD_STATE_NEWNAME_READ_NAMEHUFF;
} else {
inflater->state = NGHTTP2_HD_STATE_NEWNAME_READ_NAME;
}
break;
case NGHTTP2_HD_STATE_NEWNAME_READ_NAMEHUFF:
rv = hd_inflate_read_huff(inflater, &inflater->nvbufs, in, last);
if(rv < 0) {
goto fail;
}
in += rv;
DEBUGF(fprintf(stderr, "inflatehd: %zd bytes read\n", rv));
if(inflater->left) {
DEBUGF(fprintf(stderr,
"inflatehd: still %zd bytes to go\n", inflater->left));
goto almost_ok;
}
inflater->newnamelen = nghttp2_bufs_len(&inflater->nvbufs);
inflater->state = NGHTTP2_HD_STATE_CHECK_VALUELEN;
break;
case NGHTTP2_HD_STATE_NEWNAME_READ_NAME:
rv = hd_inflate_read(inflater, &inflater->nvbufs, in, last);
if(rv < 0) {
goto fail;
}
in += rv;
DEBUGF(fprintf(stderr, "inflatehd: %zd bytes read\n", rv));
if(inflater->left) {
DEBUGF(fprintf(stderr,
"inflatehd: still %zd bytes to go\n", inflater->left));
goto almost_ok;
}
inflater->newnamelen = nghttp2_bufs_len(&inflater->nvbufs);
inflater->state = NGHTTP2_HD_STATE_CHECK_VALUELEN;
break;
case NGHTTP2_HD_STATE_CHECK_VALUELEN:
hd_inflate_set_huffman_encoded(inflater, in);
inflater->state = NGHTTP2_HD_STATE_READ_VALUELEN;
inflater->left = 0;
DEBUGF(fprintf(stderr, "inflatehd: huffman encoded=%d\n",
inflater->huffman_encoded != 0));
/* Fall through */
case NGHTTP2_HD_STATE_READ_VALUELEN:
rfin = 0;
rv = hd_inflate_read_len(inflater, &rfin, in, last, 7,
NGHTTP2_HD_MAX_NV);
if(rv < 0) {
goto fail;
}
in += rv;
if(!rfin) {
goto almost_ok;
}
DEBUGF(fprintf(stderr, "inflatehd: valuelen=%zd\n", inflater->left));
if(inflater->left == 0) {
if(inflater->opcode == NGHTTP2_HD_OPCODE_NEWNAME) {
rv = hd_inflate_commit_newname(inflater, nv_out);
} else {
rv = hd_inflate_commit_indname(inflater, nv_out);
}
if(rv != 0) {
goto fail;
}
inflater->state = NGHTTP2_HD_STATE_OPCODE;
*inflate_flags |= NGHTTP2_HD_INFLATE_EMIT;
return in - first;
}
if(inflater->huffman_encoded) {
nghttp2_hd_huff_decode_context_init(&inflater->huff_decode_ctx);
inflater->state = NGHTTP2_HD_STATE_READ_VALUEHUFF;
} else {
inflater->state = NGHTTP2_HD_STATE_READ_VALUE;
}
break;
case NGHTTP2_HD_STATE_READ_VALUEHUFF:
rv = hd_inflate_read_huff(inflater, &inflater->nvbufs, in, last);
if(rv < 0) {
goto fail;
}
in += rv;
DEBUGF(fprintf(stderr, "inflatehd: %zd bytes read\n", rv));
if(inflater->left) {
DEBUGF(fprintf(stderr,
"inflatehd: still %zd bytes to go\n", inflater->left));
goto almost_ok;
}
if(inflater->opcode == NGHTTP2_HD_OPCODE_NEWNAME) {
rv = hd_inflate_commit_newname(inflater, nv_out);
} else {
rv = hd_inflate_commit_indname(inflater, nv_out);
}
if(rv != 0) {
goto fail;
}
inflater->state = NGHTTP2_HD_STATE_OPCODE;
*inflate_flags |= NGHTTP2_HD_INFLATE_EMIT;
return in - first;
case NGHTTP2_HD_STATE_READ_VALUE:
rv = hd_inflate_read(inflater, &inflater->nvbufs, in, last);
if(rv < 0) {
DEBUGF(fprintf(stderr, "inflatehd: value read failure %zd: %s\n",
rv, nghttp2_strerror((int)rv)));
goto fail;
}
in += rv;
DEBUGF(fprintf(stderr, "inflatehd: %zd bytes read\n", rv));
if(inflater->left) {
DEBUGF(fprintf(stderr,
"inflatehd: still %zd bytes to go\n", inflater->left));
goto almost_ok;
}
if(inflater->opcode == NGHTTP2_HD_OPCODE_NEWNAME) {
rv = hd_inflate_commit_newname(inflater, nv_out);
} else {
rv = hd_inflate_commit_indname(inflater, nv_out);
}
if(rv != 0) {
goto fail;
}
inflater->state = NGHTTP2_HD_STATE_OPCODE;
*inflate_flags |= NGHTTP2_HD_INFLATE_EMIT;
return in - first;
}
}
assert(in == last);
DEBUGF(fprintf(stderr, "inflatehd: all input bytes were processed\n"));
if(in_final) {
DEBUGF(fprintf(stderr, "inflatehd: in_final set\n"));
if(inflater->state != NGHTTP2_HD_STATE_OPCODE) {
DEBUGF(fprintf(stderr, "inflatehd: unacceptable state=%d\n",
inflater->state));
rv = NGHTTP2_ERR_HEADER_COMP;
goto fail;
}
for(; inflater->end_headers_index < inflater->ctx.hd_table.len;
++inflater->end_headers_index) {
nghttp2_hd_entry *ent;
ent = hd_ringbuf_get(&inflater->ctx.hd_table,
inflater->end_headers_index);
if((ent->flags & NGHTTP2_HD_FLAG_REFSET) &&
(ent->flags & NGHTTP2_HD_FLAG_EMIT) == 0) {
emit_indexed_header(nv_out, ent);
*inflate_flags |= NGHTTP2_HD_INFLATE_EMIT;
return in - first;
}
ent->flags &= ~NGHTTP2_HD_FLAG_EMIT;
}
*inflate_flags |= NGHTTP2_HD_INFLATE_FINAL;
}
return in - first;
almost_ok:
if(in_final && inflater->state != NGHTTP2_HD_STATE_OPCODE) {
DEBUGF(fprintf(stderr, "inflatehd: input ended prematurely\n"));
rv = NGHTTP2_ERR_HEADER_COMP;
goto fail;
}
return in - first;
fail:
DEBUGF(fprintf(stderr, "inflatehd: error return %zd\n", rv));
inflater->ctx.bad = 1;
return rv;
}
int nghttp2_hd_inflate_end_headers(nghttp2_hd_inflater *inflater)
{
hd_inflate_keep_free(inflater);
inflater->end_headers_index = 0;
return 0;
}
int nghttp2_hd_inflate_new(nghttp2_hd_inflater **inflater_ptr)
{
*inflater_ptr = malloc(sizeof(nghttp2_hd_inflater));
if(*inflater_ptr == NULL) {
return NGHTTP2_ERR_NOMEM;
}
return nghttp2_hd_inflate_init(*inflater_ptr);
}
void nghttp2_hd_inflate_del(nghttp2_hd_inflater *inflater)
{
nghttp2_hd_inflate_free(inflater);
free(inflater);
}
int nghttp2_hd_emit_indname_block(nghttp2_bufs *bufs, size_t idx,
nghttp2_nv *nv, int inc_indexing)
{
return emit_indname_block(bufs, idx, nv, inc_indexing);
}
int nghttp2_hd_emit_newname_block(nghttp2_bufs *bufs, nghttp2_nv *nv,
int inc_indexing)
{
return emit_newname_block(bufs, nv, inc_indexing);
}
int nghttp2_hd_emit_table_size(nghttp2_bufs *bufs, size_t table_size)
{
return emit_table_size(bufs, table_size);
}
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