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nghttp2/lib/nghttp2_hd.c

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/*
* nghttp2 - HTTP/2.0 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_frame.h"
#include "nghttp2_helper.h"
static const char *reqhd_table[] = {
":scheme", "http",
":scheme", "https",
":host", "",
":path", "/",
":method", "GET",
"accept", "",
"accept-charset", "",
"accept-encoding", "",
"accept-language", "",
"cookie", "",
"if-modified-since", "",
"user-agent", "",
"referer", "",
"authorization", "",
"allow", "",
"cache-control", "",
"connection", "",
"content-length", "",
"content-type", "",
"date", "",
"expect", "",
"from", "",
"if-match", "",
"if-none-match", "",
"if-range", "",
"if-unmodified-since", "",
"max-forwards", "",
"proxy-authorization", "",
"range", "",
"via", "",
NULL
};
static const char *reshd_table[] = {
":status", "200",
"age", "",
"cache-control", "",
"content-length", "",
"content-type", "",
"date", "",
"etag", "",
"expires", "",
"last-modified", "",
"server", "",
"set-cookie", "",
"vary", "",
"via", "",
"access-control-allow-origin", "",
"accept-ranges", "",
"allow", "",
"connection", "",
"content-disposition", "",
"content-encoding", "",
"content-language", "",
"content-location", "",
"content-range", "",
"link", "",
"location", "",
"proxy-authenticate", "",
"refresh", "",
"retry-after", "",
"strict-transport-security", "",
"transfer-encoding", "",
"www-authenticate", "",
NULL
};
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 index, uint8_t flags,
uint8_t *name, uint16_t namelen,
uint8_t *value, uint16_t valuelen)
{
int rv = 0;
if(flags & NGHTTP2_HD_FLAG_NAME_ALLOC) {
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) {
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->index = index;
ent->flags = flags;
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 nghttp2_hd_context_init(nghttp2_hd_context *context,
nghttp2_hd_role role,
nghttp2_hd_side side)
{
int i;
const char **ini_table;
context->role = role;
context->bad = 0;
context->hd_table = malloc(sizeof(nghttp2_hd_entry*)*
NGHTTP2_INITIAL_HD_TABLE_SIZE);
if(context->hd_table == NULL) {
return NGHTTP2_ERR_NOMEM;
}
memset(context->hd_table, 0, sizeof(nghttp2_hd_entry*)*
NGHTTP2_INITIAL_HD_TABLE_SIZE);
context->hd_table_capacity = NGHTTP2_INITIAL_HD_TABLE_SIZE;
context->hd_tablelen = 0;
context->emit_set = malloc(sizeof(nghttp2_hd_entry*)*
NGHTTP2_INITIAL_EMIT_SET_SIZE);
if(context->emit_set == NULL) {
free(context->hd_table);
return NGHTTP2_ERR_NOMEM;
}
memset(context->emit_set, 0, sizeof(nghttp2_hd_entry*)*
NGHTTP2_INITIAL_EMIT_SET_SIZE);
context->emit_set_capacity = NGHTTP2_INITIAL_EMIT_SET_SIZE;
context->emit_setlen = 0;
if(side == NGHTTP2_HD_SIDE_CLIENT) {
ini_table = reqhd_table;
} else {
ini_table = reshd_table;
}
context->hd_table_bufsize = 0;
for(i = 0; ini_table[i]; i += 2) {
nghttp2_hd_entry *p = malloc(sizeof(nghttp2_hd_entry));
if(p == NULL) {
for(i = 0; i < context->hd_tablelen; ++i) {
nghttp2_hd_entry_free(context->hd_table[i]);
free(context->hd_table[i]);
}
free(context->emit_set);
free(context->hd_table);
return NGHTTP2_ERR_NOMEM;
}
nghttp2_hd_entry_init(p, i / 2, NGHTTP2_HD_FLAG_NONE,
(uint8_t*)ini_table[i], strlen(ini_table[i]),
(uint8_t*)ini_table[i + 1],
strlen(ini_table[i+1]));
context->hd_table[context->hd_tablelen++] = p;
context->hd_table_bufsize += NGHTTP2_HD_ENTRY_OVERHEAD +
p->nv.namelen + p->nv.valuelen;
}
return 0;
}
int nghttp2_hd_deflate_init(nghttp2_hd_context *deflater, nghttp2_hd_side side)
{
return nghttp2_hd_context_init(deflater, NGHTTP2_HD_ROLE_DEFLATE, side);
}
int nghttp2_hd_inflate_init(nghttp2_hd_context *inflater, nghttp2_hd_side side)
{
return nghttp2_hd_context_init(inflater, NGHTTP2_HD_ROLE_INFLATE, side^1);
}
static void nghttp2_hd_context_free(nghttp2_hd_context *context)
{
size_t i;
for(i = 0; i < context->emit_setlen; ++i) {
nghttp2_hd_entry *ent = context->emit_set[i];
if(--ent->ref == 0) {
nghttp2_hd_entry_free(ent);
free(ent);
}
}
for(i = 0; i < context->hd_tablelen; ++i) {
nghttp2_hd_entry *ent = context->hd_table[i];
--ent->ref;
nghttp2_hd_entry_free(ent);
free(ent);
}
free(context->emit_set);
free(context->hd_table);
}
void nghttp2_hd_deflate_free(nghttp2_hd_context *deflater)
{
nghttp2_hd_context_free(deflater);
}
void nghttp2_hd_inflate_free(nghttp2_hd_context *inflater)
{
nghttp2_hd_context_free(inflater);
}
static size_t entry_room(size_t namelen, size_t valuelen)
{
return NGHTTP2_HD_ENTRY_OVERHEAD + namelen + valuelen;
}
static int add_nva(nghttp2_nva_out *nva_out_ptr,
uint8_t *name, uint16_t namelen,
uint8_t *value, uint16_t valuelen)
{
nghttp2_nv *nv;
if(nva_out_ptr->nvacap == nva_out_ptr->nvlen) {
size_t newcap = nva_out_ptr->nvacap == 0 ? 16 : nva_out_ptr->nvacap * 2;
nghttp2_nv *new_nva = realloc(nva_out_ptr->nva, sizeof(nghttp2_nv)*newcap);
if(new_nva == NULL) {
return NGHTTP2_ERR_NOMEM;
}
nva_out_ptr->nva = new_nva;
nva_out_ptr->nvacap = newcap;
}
nv = &nva_out_ptr->nva[nva_out_ptr->nvlen++];
nv->name = name;
nv->namelen = namelen;
nv->value = value;
nv->valuelen = valuelen;
return 0;
}
static int add_emit_set(nghttp2_hd_context *context, nghttp2_hd_entry *ent)
{
if(context->emit_setlen == context->emit_set_capacity) {
return NGHTTP2_ERR_HEADER_COMP;
}
context->emit_set[context->emit_setlen++] = ent;
++ent->ref;
return 0;
}
static int emit_indexed_header(nghttp2_hd_context *context,
nghttp2_nva_out *nva_out_ptr,
nghttp2_hd_entry *ent)
{
int rv;
rv = add_emit_set(context, ent);
if(rv != 0) {
return rv;
}
ent->flags |= NGHTTP2_HD_FLAG_EMIT;
return add_nva(nva_out_ptr,
ent->nv.name, ent->nv.namelen,
ent->nv.value, ent->nv.valuelen);
}
static int emit_newname_header(nghttp2_hd_context *context,
nghttp2_nva_out *nva_out_ptr,
nghttp2_nv *nv)
{
return add_nva(nva_out_ptr,
nv->name, nv->namelen, nv->value, nv->valuelen);
}
static int emit_indname_header(nghttp2_hd_context *context,
nghttp2_nva_out *nva_out_ptr,
nghttp2_hd_entry *ent,
uint8_t *value, size_t valuelen)
{
int rv;
rv = add_emit_set(context, ent);
if(rv != 0) {
return rv;
}
return add_nva(nva_out_ptr, ent->nv.name, ent->nv.namelen, value, valuelen);
}
static nghttp2_hd_entry* add_hd_table_incremental(nghttp2_hd_context *context,
nghttp2_nv *nv)
{
int rv;
size_t i;
nghttp2_hd_entry *new_ent;
size_t room = entry_room(nv->namelen, nv->valuelen);
context->hd_table_bufsize += room;
for(i = 0; i < context->hd_tablelen &&
context->hd_table_bufsize > NGHTTP2_HD_MAX_BUFFER_SIZE; ++i) {
nghttp2_hd_entry *ent = context->hd_table[i];
context->hd_table_bufsize -= entry_room(ent->nv.namelen, ent->nv.valuelen);
ent->index = NGHTTP2_HD_INVALID_INDEX;
if(context->role == NGHTTP2_HD_ROLE_DEFLATE &&
(ent->flags & NGHTTP2_HD_FLAG_IMPLICIT_EMIT)) {
/* We will emit this entry later not to lose the header
field. */
rv = add_emit_set(context, ent);
if(rv != 0) {
return NULL;
}
}
if(--ent->ref == 0) {
nghttp2_hd_entry_free(ent);
free(ent);
}
}
if(i > 0) {
size_t j;
for(j = 0; i < context->hd_tablelen; ++i, ++j) {
context->hd_table[j] = context->hd_table[i];
context->hd_table[j]->index = j;
}
context->hd_tablelen = j;
}
new_ent = malloc(sizeof(nghttp2_hd_entry));
if(new_ent == NULL) {
return NULL;
}
rv = nghttp2_hd_entry_init(new_ent, context->hd_tablelen,
NGHTTP2_HD_FLAG_NAME_ALLOC |
NGHTTP2_HD_FLAG_VALUE_ALLOC,
nv->name, nv->namelen, nv->value, nv->valuelen);
if(rv != 0) {
return NULL;
}
if(room > NGHTTP2_HD_MAX_BUFFER_SIZE) {
/* The entry taking more than NGHTTP2_HD_MAX_BUFFER_SIZE is
immediately evicted. */
new_ent->index = NGHTTP2_HD_INVALID_INDEX;
--new_ent->ref;
} else {
/* Because of current NGHTTP2_HD_MAX_BUFFER_SIZE,
NGHTTP2_HD_ENTRY_OVERHEAD and NGHTTP2_INITIAL_HD_TABLE_SIZE,
context->hd_tablelen is strictly less than
context->hd_table_capacity. */
assert(context->hd_tablelen < context->hd_table_capacity);
context->hd_table[context->hd_tablelen++] = new_ent;
new_ent->flags |= NGHTTP2_HD_FLAG_REFSET;
}
return new_ent;
}
static nghttp2_hd_entry* add_hd_table_subst(nghttp2_hd_context *context,
nghttp2_nv *nv, size_t subindex)
{
int rv;
size_t i;
int k;
nghttp2_hd_entry *new_ent;
size_t room = entry_room(nv->namelen, nv->valuelen);
if(context->hd_tablelen <= subindex) {
return NULL;
}
context->hd_table_bufsize -=
entry_room(context->hd_table[subindex]->nv.namelen,
context->hd_table[subindex]->nv.valuelen);
context->hd_table_bufsize += room;
k = subindex;
for(i = 0; i < context->hd_tablelen &&
context->hd_table_bufsize > NGHTTP2_HD_MAX_BUFFER_SIZE; ++i, --k) {
nghttp2_hd_entry *ent = context->hd_table[i];
if(i != subindex) {
context->hd_table_bufsize -= entry_room(ent->nv.namelen,
ent->nv.valuelen);
}
ent->index = NGHTTP2_HD_INVALID_INDEX;
if(context->role == NGHTTP2_HD_ROLE_DEFLATE &&
(ent->flags & NGHTTP2_HD_FLAG_IMPLICIT_EMIT)) {
/* We will emit this entry later not to lose the header
field. */
rv = add_emit_set(context, ent);
if(rv != 0) {
return NULL;
}
}
if(--ent->ref == 0) {
nghttp2_hd_entry_free(ent);
free(ent);
}
}
if(i > 0) {
size_t j;
/* k < 0 means that the index to substitute originally was
evicted. Therefore, index 0 is the position to substitute
now. */
if(k < 0) {
j = 1;
} else {
j = 0;
}
for(; i < context->hd_tablelen; ++i, ++j) {
context->hd_table[j] = context->hd_table[i];
context->hd_table[j]->index = j;
}
context->hd_tablelen = j;
}
new_ent = malloc(sizeof(nghttp2_hd_entry));
if(new_ent == NULL) {
return NULL;
}
if(k >= 0) {
nghttp2_hd_entry *ent = context->hd_table[k];
ent->index = NGHTTP2_HD_INVALID_INDEX;
if(context->role == NGHTTP2_HD_ROLE_DEFLATE &&
(ent->flags & NGHTTP2_HD_FLAG_IMPLICIT_EMIT)) {
/* We will emit this entry later not to lose the header
field. */
rv = add_emit_set(context, ent);
if(rv != 0) {
return NULL;
}
}
if(--ent->ref == 0) {
nghttp2_hd_entry_free(ent);
free(ent);
}
} else {
k = 0;
}
rv = nghttp2_hd_entry_init(new_ent, k,
NGHTTP2_HD_FLAG_NAME_ALLOC |
NGHTTP2_HD_FLAG_VALUE_ALLOC,
nv->name, nv->namelen, nv->value, nv->valuelen);
if(rv != 0) {
return NULL;
}
if(room > NGHTTP2_HD_MAX_BUFFER_SIZE) {
new_ent->index = NGHTTP2_HD_INVALID_INDEX;
--new_ent->ref;
context->hd_tablelen = 0;
} else {
context->hd_table[new_ent->index] = new_ent;
new_ent->flags |= NGHTTP2_HD_FLAG_REFSET;
}
return new_ent;
}
static nghttp2_hd_entry* find_in_hd_table(nghttp2_hd_context *context,
nghttp2_nv *nv)
{
size_t i;
for(i = 0; i < context->hd_tablelen; ++i) {
nghttp2_hd_entry *ent = context->hd_table[i];
if(nghttp2_nv_equal(&ent->nv, nv)) {
return ent;
}
}
return NULL;
}
static nghttp2_hd_entry* find_name_in_hd_table(nghttp2_hd_context *context,
nghttp2_nv *nv)
{
size_t i;
for(i = 0; i < context->hd_tablelen; ++i) {
nghttp2_hd_entry *ent = context->hd_table[i];
if(ent->nv.namelen == nv->namelen &&
memcmp(ent->nv.name, nv->name, nv->namelen) == 0) {
return ent;
}
}
return NULL;
}
static int ensure_write_buffer(uint8_t **buf_ptr, size_t *buflen_ptr,
size_t offset, size_t need)
{
int rv;
/* TODO Remove this limitation when header continuation is
implemented. */
if(need + offset > NGHTTP2_MAX_HTTP_FRAME_LENGTH) {
return NGHTTP2_ERR_HEADER_COMP;
}
rv = nghttp2_reserve_buffer(buf_ptr, buflen_ptr, offset + need);
if(rv != 0) {
return NGHTTP2_ERR_NOMEM;
}
return 0;
}
static size_t count_encoded_length(size_t n, int 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, int prefix)
{
size_t k = (1 << prefix) - 1;
size_t len = 0;
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.
*
* This function returns the next byte of read byte. This function
* stores the decoded integer in |*res| if it succeeds, or stores -1
* in |*res|, indicating decoding error.
*/
static uint8_t* decode_length(ssize_t *res, uint8_t *in, uint8_t *last,
int prefix)
{
int k = (1 << prefix) - 1, r;
if(in == last) {
*res = -1;
return in;
}
if((*in & k) == k) {
*res = k;
} else {
*res = (*in) & k;
return in + 1;
}
++in;
for(r = 0; in != last; ++in, r += 7) {
*res += (*in & 0x7f) << r;
if(*res >= (1 << 16)) {
*res = -1;
return in + 1;
}
if((*in & (1 << 7)) == 0) {
break;
}
}
if(*in & (1 << 7)) {
*res = -1;
return NULL;
} else {
return in + 1;
}
}
static int emit_indexed_block(uint8_t **buf_ptr, size_t *buflen_ptr,
size_t *offset_ptr, size_t index)
{
int rv;
uint8_t *bufp;
size_t blocklen = count_encoded_length(index, 7);
rv = ensure_write_buffer(buf_ptr, buflen_ptr, *offset_ptr, blocklen);
if(rv != 0) {
return rv;
}
bufp = *buf_ptr + *offset_ptr;
encode_length(bufp, index, 7);
(*buf_ptr)[*offset_ptr] |= 0x80u;
*offset_ptr += blocklen;
return 0;
}
static int emit_indname_block(uint8_t **buf_ptr, size_t *buflen_ptr,
size_t *offset_ptr, size_t index,
const uint8_t *value, size_t valuelen,
int inc_indexing)
{
int rv;
uint8_t *bufp;
size_t blocklen = count_encoded_length(index + 1, 5) +
count_encoded_length(valuelen, 8) + valuelen;
rv = ensure_write_buffer(buf_ptr, buflen_ptr, *offset_ptr, blocklen);
if(rv != 0) {
return rv;
}
bufp = *buf_ptr + *offset_ptr;
bufp += encode_length(bufp, index + 1, 5);
bufp += encode_length(bufp, valuelen, 8);
memcpy(bufp, value, valuelen);
(*buf_ptr)[*offset_ptr] |= inc_indexing ? 0x40u : 0x60u;
assert(bufp+valuelen - (*buf_ptr + *offset_ptr) == (ssize_t)blocklen);
*offset_ptr += blocklen;
return 0;
}
static int emit_newname_block(uint8_t **buf_ptr, size_t *buflen_ptr,
size_t *offset_ptr, nghttp2_nv *nv,
int inc_indexing)
{
int rv;
uint8_t *bufp;
size_t blocklen = 1 + count_encoded_length(nv->namelen, 8) + nv->namelen +
count_encoded_length(nv->valuelen, 8) + nv->valuelen;
rv = ensure_write_buffer(buf_ptr, buflen_ptr, *offset_ptr, blocklen);
if(rv != 0) {
return rv;
}
bufp = *buf_ptr + *offset_ptr;
*bufp++ = inc_indexing ? 0x40u : 0x60u;
bufp += encode_length(bufp, nv->namelen, 8);
memcpy(bufp, nv->name, nv->namelen);
bufp += nv->namelen;
bufp += encode_length(bufp, nv->valuelen, 8);
memcpy(bufp, nv->value, nv->valuelen);
*offset_ptr += blocklen;
return 0;
}
static int emit_subst_indname_block(uint8_t **buf_ptr, size_t *buflen_ptr,
size_t *offset_ptr, size_t index,
const uint8_t *value, size_t valuelen,
size_t subindex)
{
int rv;
uint8_t *bufp;
size_t blocklen = count_encoded_length(index + 1, 6) +
count_encoded_length(subindex, 8) +
count_encoded_length(valuelen, 8) + valuelen;
rv = ensure_write_buffer(buf_ptr, buflen_ptr, *offset_ptr, blocklen);
if(rv != 0) {
return rv;
}
bufp = *buf_ptr + *offset_ptr;
bufp += encode_length(bufp, index + 1, 6);
bufp += encode_length(bufp, subindex, 8);
bufp += encode_length(bufp, valuelen, 8);
memcpy(bufp, value, valuelen);
*offset_ptr += blocklen;
return 0;
}
static int emit_subst_newname_block(uint8_t **buf_ptr, size_t *buflen_ptr,
size_t *offset_ptr, nghttp2_nv *nv,
size_t subindex)
{
int rv;
uint8_t *bufp;
size_t blocklen = 1 + count_encoded_length(nv->namelen, 8) + nv->namelen +
count_encoded_length(subindex, 8) +
count_encoded_length(nv->valuelen, 8) + nv->valuelen;
rv = ensure_write_buffer(buf_ptr, buflen_ptr, *offset_ptr, blocklen);
if(rv != 0) {
return rv;
}
bufp = *buf_ptr + *offset_ptr;
*bufp++ = 0;
bufp += encode_length(bufp, nv->namelen, 8);
memcpy(bufp, nv->name, nv->namelen);
bufp += nv->namelen;
bufp += encode_length(bufp, subindex, 8);
bufp += encode_length(bufp, nv->valuelen, 8);
memcpy(bufp, nv->value, nv->valuelen);
*offset_ptr += blocklen;
return 0;
}
static int intcompar(const void *lhs, const void *rhs)
{
return *(int*)lhs - *(int*)rhs;
}
static int deflate_nv(nghttp2_hd_context *deflater,
uint8_t **buf_ptr, size_t *buflen_ptr,
size_t *offset_ptr,
nghttp2_nv *nv)
{
int rv;
nghttp2_hd_entry *ent;
ent = find_in_hd_table(deflater, nv);
if(ent) {
if((ent->flags & NGHTTP2_HD_FLAG_REFSET) == 0) {
ent->flags |= NGHTTP2_HD_FLAG_REFSET | NGHTTP2_HD_FLAG_EMIT;
rv = emit_indexed_block(buf_ptr, buflen_ptr, offset_ptr, ent->index);
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;
}
for(; num_emits > 0; --num_emits) {
rv = emit_indexed_block(buf_ptr, buflen_ptr, offset_ptr, ent->index);
if(rv != 0) {
break;
}
}
}
} else {
uint8_t index = NGHTTP2_HD_INVALID_INDEX;
int incidx = 0;
ent = find_name_in_hd_table(deflater, nv);
if(ent) {
index = ent->index;
}
if(entry_room(nv->namelen, nv->valuelen)
< NGHTTP2_HD_MAX_ENTRY_SIZE) {
nghttp2_hd_entry *new_ent;
new_ent = add_hd_table_incremental(deflater, nv);
if(!new_ent) {
return NGHTTP2_ERR_HEADER_COMP;
}
new_ent->flags |= NGHTTP2_HD_FLAG_EMIT;
incidx = 1;
}
if(index == NGHTTP2_HD_INVALID_INDEX) {
rv = emit_newname_block(buf_ptr, buflen_ptr, offset_ptr, nv, incidx);
} else {
rv = emit_indname_block(buf_ptr, buflen_ptr, offset_ptr, index,
nv->value, nv->valuelen, incidx);
}
if(rv != 0) {
return rv;
}
}
return 0;
}
ssize_t nghttp2_hd_deflate_hd(nghttp2_hd_context *deflater,
uint8_t **buf_ptr, size_t *buflen_ptr,
size_t nv_offset,
nghttp2_nv *nv, size_t nvlen)
{
size_t i, j, k, offset;
int rv = 0;
int common_hd[NGHTTP2_INITIAL_HD_TABLE_SIZE];
size_t common_hdlen = 0;
if(deflater->bad) {
return NGHTTP2_ERR_HEADER_COMP;
}
offset = nv_offset;
/* First emit indexed repr to remove deleted header fields */
for(i = 0; i < deflater->hd_tablelen; ++i) {
nghttp2_hd_entry *ent = deflater->hd_table[i];
if((ent->flags & NGHTTP2_HD_FLAG_REFSET) == 0) {
continue;
}
for(j = 0; j < nvlen; ++j) {
if(nghttp2_nv_equal(&ent->nv, &nv[j])) {
break;
}
}
if(j < nvlen) {
/* Assuming the encoder does not put duplicated entry in the
header table, this entry is common header field between
previous header set. So it is "implicitly emitted". */
ent->flags |= NGHTTP2_HD_FLAG_IMPLICIT_EMIT;
common_hd[common_hdlen++] = j;
continue;
}
ent->flags ^= NGHTTP2_HD_FLAG_REFSET;
rv = emit_indexed_block(buf_ptr, buflen_ptr, &offset, ent->index);
if(rv != 0) {
goto fail;
}
}
qsort(common_hd, common_hdlen, sizeof(int), intcompar);
for(i = 0, k = 0; i < nvlen; ++i) {
if(k < common_hdlen) {
/* Skip implicitly emitted name/value pair */
if((uint8_t)common_hd[k] == i) {
++k;
continue;
}
}
rv = deflate_nv(deflater, buf_ptr, buflen_ptr, &offset, &nv[i]);
if(rv != 0) {
goto fail;
}
}
/* Encode the lost common headers. Keep in mind that
deflater->emit_setlen may be increased by deflate_nv(). */
for(i = 0; i < deflater->emit_setlen; ++i) {
nghttp2_hd_entry *ent = deflater->emit_set[i];
rv = deflate_nv(deflater, buf_ptr, buflen_ptr, &offset, &ent->nv);
if(rv != 0) {
goto fail;
}
}
for(i = 0; i < deflater->hd_tablelen; ++i) {
nghttp2_hd_entry *ent = deflater->hd_table[i];
ent->flags &= ~(NGHTTP2_HD_FLAG_EMIT | NGHTTP2_HD_FLAG_IMPLICIT_EMIT);
}
return offset - nv_offset;
fail:
deflater->bad = 1;
return rv;
}
ssize_t nghttp2_hd_inflate_hd(nghttp2_hd_context *inflater,
nghttp2_nv **nva_ptr,
uint8_t *in, size_t inlen)
{
size_t i;
int rv = 0;
uint8_t *last = in + inlen;
nghttp2_nva_out nva_out;
memset(&nva_out, 0, sizeof(nva_out));
if(inflater->bad) {
return NGHTTP2_ERR_HEADER_COMP;
}
*nva_ptr = NULL;
for(; in != last;) {
uint8_t c = *in;
if(c & 0x80u) {
/* Indexed Header Repr */
ssize_t index;
nghttp2_hd_entry *ent;
in = decode_length(&index, in, last, 7);
if(index < 0) {
rv = NGHTTP2_ERR_HEADER_COMP;
goto fail;
}
if(inflater->hd_tablelen <= index) {
rv = NGHTTP2_ERR_HEADER_COMP;
goto fail;
}
ent = inflater->hd_table[index];
ent->flags ^= NGHTTP2_HD_FLAG_REFSET;
if(ent->flags & NGHTTP2_HD_FLAG_REFSET) {
rv = emit_indexed_header(inflater, &nva_out, ent);
if(rv != 0) {
goto fail;
}
}
} else if(c == 0x40u || c == 0x60u || c == 0) {
/* Literal Header Repr - New Name */
nghttp2_nv nv;
ssize_t namelen, valuelen, subindex;
if(++in == last) {
rv = NGHTTP2_ERR_HEADER_COMP;
goto fail;
}
in = decode_length(&namelen, in, last, 8);
if(namelen < 0 || in + namelen > last) {
rv = NGHTTP2_ERR_HEADER_COMP;
goto fail;
}
if(!nghttp2_check_header_name(in, namelen)) {
rv = NGHTTP2_ERR_HEADER_COMP;
goto fail;
}
nv.name = in;
in += namelen;
if(c == 0) {
in = decode_length(&subindex, in, last, 8);
if(subindex < 0) {
rv = NGHTTP2_ERR_HEADER_COMP;
goto fail;
}
}
in = decode_length(&valuelen, in, last, 8);
if(valuelen < 0 || in + valuelen > last) {
rv = NGHTTP2_ERR_HEADER_COMP;
goto fail;
}
nv.namelen = namelen;
nv.value = in;
nv.valuelen = valuelen;
in += valuelen;
nghttp2_downcase(nv.name, nv.namelen);
if(c == 0x60u) {
rv = emit_newname_header(inflater, &nva_out, &nv);
} else {
nghttp2_hd_entry *new_ent;
if(c == 0) {
new_ent = add_hd_table_subst(inflater, &nv, subindex);
} else {
new_ent = add_hd_table_incremental(inflater, &nv);
}
if(new_ent) {
rv = emit_indexed_header(inflater, &nva_out, new_ent);
} else {
rv = NGHTTP2_ERR_HEADER_COMP;
}
}
if(rv != 0) {
goto fail;
}
} else {
/* Literal Header Repr - Indexed Name */
nghttp2_hd_entry *ent;
uint8_t *value;
ssize_t valuelen, index, subindex;
in = decode_length(&index, in, last, (c & 0x40u) ? 5 : 6);
if(index < 0) {
rv = NGHTTP2_ERR_HEADER_COMP;
goto fail;
}
--index;
if(inflater->hd_tablelen <= index) {
rv = NGHTTP2_ERR_HEADER_COMP;
goto fail;
}
ent = inflater->hd_table[index];
if((c & 0x40u) == 0) {
in = decode_length(&subindex, in, last, 8);
if(subindex < 0) {
rv = NGHTTP2_ERR_HEADER_COMP;
goto fail;
}
}
in = decode_length(&valuelen, in , last, 8);
if(valuelen < 0 || in + valuelen > last) {
rv = NGHTTP2_ERR_HEADER_COMP;
goto fail;
}
value = in;
in += valuelen;
if((c & 0x60u) == 0x60u) {
rv = emit_indname_header(inflater, &nva_out, ent, value, valuelen);
} else {
nghttp2_nv nv;
nghttp2_hd_entry *new_ent;
++ent->ref;
nv.name = ent->nv.name;
nv.namelen = ent->nv.namelen;
nv.value = value;
nv.valuelen = valuelen;
if((c & 0x40u) == 0) {
new_ent = add_hd_table_subst(inflater, &nv, subindex);
} else {
new_ent = add_hd_table_incremental(inflater, &nv);
}
if(--ent->ref == 0) {
nghttp2_hd_entry_free(ent);
free(ent);
}
if(new_ent) {
rv = emit_indexed_header(inflater, &nva_out, new_ent);
} else {
rv = NGHTTP2_ERR_HEADER_COMP;
}
}
if(rv != 0) {
goto fail;
}
}
}
for(i = 0; i < inflater->hd_tablelen; ++i) {
nghttp2_hd_entry *ent = inflater->hd_table[i];
if((ent->flags & NGHTTP2_HD_FLAG_REFSET) &&
(ent->flags & NGHTTP2_HD_FLAG_EMIT) == 0) {
rv = emit_indexed_header(inflater, &nva_out, ent);
if(rv != 0) {
goto fail;
}
}
ent->flags &= ~NGHTTP2_HD_FLAG_EMIT;
}
nghttp2_nv_array_sort(nva_out.nva, nva_out.nvlen);
*nva_ptr = nva_out.nva;
return nva_out.nvlen;
fail:
inflater->bad = 1;
free(nva_out.nva);
return rv;
}
int nghttp2_hd_end_headers(nghttp2_hd_context *context)
{
size_t i;
for(i = 0; i < context->emit_setlen; ++i) {
nghttp2_hd_entry *ent = context->emit_set[i];
if(--ent->ref == 0) {
nghttp2_hd_entry_free(ent);
free(ent);
}
}
context->emit_setlen = 0;
return 0;
}
int nghttp2_hd_emit_indname_block(uint8_t **buf_ptr, size_t *buflen_ptr,
size_t *offset_ptr, size_t index,
const uint8_t *value, size_t valuelen,
int inc_indexing)
{
return emit_indname_block(buf_ptr, buflen_ptr, offset_ptr,
index, value, valuelen, inc_indexing);
}
int nghttp2_hd_emit_newname_block(uint8_t **buf_ptr, size_t *buflen_ptr,
size_t *offset_ptr, nghttp2_nv *nv,
int inc_indexing)
{
return emit_newname_block(buf_ptr, buflen_ptr, offset_ptr, nv, inc_indexing);
}
int nghttp2_hd_emit_subst_indname_block(uint8_t **buf_ptr, size_t *buflen_ptr,
size_t *offset_ptr, size_t index,
const uint8_t *value, size_t valuelen,
size_t subindex)
{
return emit_subst_indname_block(buf_ptr, buflen_ptr, offset_ptr, index,
value, valuelen, subindex);
}
int nghttp2_hd_emit_subst_newname_block(uint8_t **buf_ptr, size_t *buflen_ptr,
size_t *offset_ptr, nghttp2_nv *nv,
size_t subindex)
{
return emit_subst_newname_block(buf_ptr, buflen_ptr, offset_ptr, nv,
subindex);
}
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