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nghttp2/lib/nghttp2_frame.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_frame.h"
#include <string.h>
#include <assert.h>
#include <stdio.h>
#include <errno.h>
#include "nghttp2_helper.h"
#include "nghttp2_net.h"
int nghttp2_frame_is_data_frame(uint8_t *head)
{
return head[2] == 0;
}
void nghttp2_frame_pack_frame_hd(uint8_t* buf, const nghttp2_frame_hd *hd)
{
nghttp2_put_uint16be(&buf[0], hd->length);
buf[2]= hd->type;
buf[3] = hd->flags;
nghttp2_put_uint32be(&buf[4], hd->stream_id);
}
void nghttp2_frame_unpack_frame_hd(nghttp2_frame_hd *hd, const uint8_t* buf)
{
hd->length = nghttp2_get_uint16(&buf[0]) & NGHTTP2_FRAME_LENGTH_MASK;
hd->type = buf[2];
hd->flags = buf[3];
hd->stream_id = nghttp2_get_uint32(&buf[4]) & NGHTTP2_STREAM_ID_MASK;
}
static void nghttp2_frame_set_hd(nghttp2_frame_hd *hd, uint16_t length,
uint8_t type, uint8_t flags,
int32_t stream_id)
{
hd->length = length;
hd->type = type;
hd->flags = flags;
hd->stream_id = stream_id;
}
void nghttp2_frame_headers_init(nghttp2_headers *frame,
uint8_t flags, int32_t stream_id, int32_t pri,
nghttp2_nv *nva, size_t nvlen)
{
memset(frame, 0, sizeof(nghttp2_headers));
nghttp2_frame_set_hd(&frame->hd, 0, NGHTTP2_HEADERS, flags, stream_id);
frame->pri = pri;
frame->nva = nva;
frame->nvlen = nvlen;
frame->cat = NGHTTP2_HCAT_REQUEST;
}
void nghttp2_frame_headers_free(nghttp2_headers *frame)
{
nghttp2_nv_array_del(frame->nva);
}
void nghttp2_frame_priority_init(nghttp2_priority *frame, int32_t stream_id,
int32_t pri)
{
memset(frame, 0, sizeof(nghttp2_priority));
nghttp2_frame_set_hd(&frame->hd, 4, NGHTTP2_PRIORITY, NGHTTP2_FLAG_NONE,
stream_id);
frame->pri = pri;
}
void nghttp2_frame_priority_free(nghttp2_priority *frame)
{}
void nghttp2_frame_rst_stream_init(nghttp2_rst_stream *frame,
int32_t stream_id,
nghttp2_error_code error_code)
{
memset(frame, 0, sizeof(nghttp2_rst_stream));
nghttp2_frame_set_hd(&frame->hd, 4, NGHTTP2_RST_STREAM, NGHTTP2_FLAG_NONE,
stream_id);
frame->error_code = error_code;
}
void nghttp2_frame_rst_stream_free(nghttp2_rst_stream *frame)
{}
void nghttp2_frame_settings_init(nghttp2_settings *frame, uint8_t flags,
nghttp2_settings_entry *iv, size_t niv)
{
memset(frame, 0, sizeof(nghttp2_settings));
nghttp2_frame_set_hd(&frame->hd, niv * NGHTTP2_FRAME_SETTINGS_ENTRY_LENGTH,
NGHTTP2_SETTINGS, flags, 0);
frame->niv = niv;
frame->iv = iv;
}
void nghttp2_frame_settings_free(nghttp2_settings *frame)
{
free(frame->iv);
}
void nghttp2_frame_push_promise_init(nghttp2_push_promise *frame,
uint8_t flags, int32_t stream_id,
int32_t promised_stream_id,
nghttp2_nv *nva, size_t nvlen)
{
memset(frame, 0, sizeof(nghttp2_push_promise));
nghttp2_frame_set_hd(&frame->hd, 0, NGHTTP2_PUSH_PROMISE, flags, stream_id);
frame->promised_stream_id = promised_stream_id;
frame->nva = nva;
frame->nvlen = nvlen;
}
void nghttp2_frame_push_promise_free(nghttp2_push_promise *frame)
{
nghttp2_nv_array_del(frame->nva);
}
void nghttp2_frame_ping_init(nghttp2_ping *frame, uint8_t flags,
const uint8_t *opaque_data)
{
memset(frame, 0, sizeof(nghttp2_ping));
nghttp2_frame_set_hd(&frame->hd, 8, NGHTTP2_PING, flags, 0);
if(opaque_data) {
memcpy(frame->opaque_data, opaque_data, sizeof(frame->opaque_data));
}
}
void nghttp2_frame_ping_free(nghttp2_ping *frame)
{}
void nghttp2_frame_goaway_init(nghttp2_goaway *frame, int32_t last_stream_id,
nghttp2_error_code error_code,
uint8_t *opaque_data, size_t opaque_data_len)
{
memset(frame, 0, sizeof(nghttp2_goaway));
nghttp2_frame_set_hd(&frame->hd, 8+opaque_data_len, NGHTTP2_GOAWAY,
NGHTTP2_FLAG_NONE, 0);
frame->last_stream_id = last_stream_id;
frame->error_code = error_code;
frame->opaque_data = opaque_data;
frame->opaque_data_len = opaque_data_len;
}
void nghttp2_frame_goaway_free(nghttp2_goaway *frame)
{
free(frame->opaque_data);
}
void nghttp2_frame_window_update_init(nghttp2_window_update *frame,
uint8_t flags,
int32_t stream_id,
int32_t window_size_increment)
{
memset(frame, 0, sizeof(nghttp2_window_update));
nghttp2_frame_set_hd(&frame->hd, 4, NGHTTP2_WINDOW_UPDATE, flags, stream_id);
frame->window_size_increment = window_size_increment;
}
void nghttp2_frame_window_update_free(nghttp2_window_update *frame)
{}
void nghttp2_frame_data_init(nghttp2_data *frame, nghttp2_private_data *pdata)
{
frame->hd = pdata->hd;
frame->padlen = pdata->padlen;
/* flags may have NGHTTP2_FLAG_END_STREAM even if the sent chunk
is not the end of the stream */
if(!pdata->eof) {
frame->hd.flags &= ~NGHTTP2_FLAG_END_STREAM;
}
}
size_t nghttp2_frame_trail_padlen(nghttp2_frame *frame, size_t padlen)
{
return padlen
- ((frame->hd.flags & NGHTTP2_FLAG_PAD_HIGH) > 0)
- ((frame->hd.flags & NGHTTP2_FLAG_PAD_LOW) > 0);
}
void nghttp2_frame_private_data_init(nghttp2_private_data *frame,
uint8_t flags,
int32_t stream_id,
const nghttp2_data_provider *data_prd)
{
memset(frame, 0, sizeof(nghttp2_private_data));
/* At this moment, the length of DATA frame is unknown */
nghttp2_frame_set_hd(&frame->hd, 0, NGHTTP2_DATA, flags, stream_id);
frame->data_prd = *data_prd;
}
void nghttp2_frame_private_data_free(nghttp2_private_data *frame)
{}
size_t nghttp2_frame_headers_payload_nv_offset(nghttp2_headers *frame)
{
if(frame->hd.flags & NGHTTP2_FLAG_PRIORITY) {
return 4;
} else {
return 0;
}
}
ssize_t nghttp2_frame_pack_headers(uint8_t **buf_ptr,
size_t *buflen_ptr,
size_t *bufoff_ptr,
nghttp2_headers *frame,
nghttp2_hd_deflater *deflater)
{
size_t payloadoff = NGHTTP2_FRAME_HEAD_LENGTH + 2;
size_t nv_offset =
payloadoff + nghttp2_frame_headers_payload_nv_offset(frame);
ssize_t rv;
size_t payloadlen;
rv = nghttp2_hd_deflate_hd(deflater, buf_ptr, buflen_ptr, nv_offset,
frame->nva, frame->nvlen);
if(rv < 0) {
return rv;
}
payloadlen = nghttp2_frame_headers_payload_nv_offset(frame) + rv;
*bufoff_ptr = 2;
frame->padlen = 0;
frame->hd.length = payloadlen;
/* If frame->nvlen == 0, *buflen_ptr may be smaller than
nv_offset */
rv = nghttp2_reserve_buffer(buf_ptr, buflen_ptr, nv_offset);
if(rv < 0) {
return rv;
}
memset(*buf_ptr + *bufoff_ptr, 0, NGHTTP2_FRAME_HEAD_LENGTH);
/* pack ctrl header after length is determined */
if(NGHTTP2_MAX_FRAME_LENGTH < payloadlen) {
/* Needs CONTINUATION */
nghttp2_frame_hd hd = frame->hd;
hd.flags &= ~NGHTTP2_FLAG_END_HEADERS;
hd.length = NGHTTP2_MAX_FRAME_LENGTH;
nghttp2_frame_pack_frame_hd(*buf_ptr + *bufoff_ptr, &hd);
} else {
nghttp2_frame_pack_frame_hd(*buf_ptr + *bufoff_ptr, &frame->hd);
}
if(frame->hd.flags & NGHTTP2_FLAG_PRIORITY) {
nghttp2_put_uint32be(&(*buf_ptr)[payloadoff], frame->pri);
}
return *bufoff_ptr + NGHTTP2_FRAME_HEAD_LENGTH + frame->hd.length;
}
int nghttp2_frame_unpack_headers_payload(nghttp2_headers *frame,
const uint8_t *payload,
size_t payloadlen)
{
if(frame->hd.flags & NGHTTP2_FLAG_PRIORITY) {
frame->pri = nghttp2_get_uint32(payload) & NGHTTP2_PRIORITY_MASK;
} else {
frame->pri = NGHTTP2_PRI_DEFAULT;
}
frame->nva = NULL;
frame->nvlen = 0;
return 0;
}
ssize_t nghttp2_frame_pack_priority(uint8_t **buf_ptr, size_t *buflen_ptr,
nghttp2_priority *frame)
{
ssize_t framelen= NGHTTP2_FRAME_HEAD_LENGTH + 4;
int r;
r = nghttp2_reserve_buffer(buf_ptr, buflen_ptr, framelen);
if(r != 0) {
return r;
}
memset(*buf_ptr, 0, framelen);
nghttp2_frame_pack_frame_hd(*buf_ptr, &frame->hd);
nghttp2_put_uint32be(&(*buf_ptr)[8], frame->pri);
return framelen;
}
void nghttp2_frame_unpack_priority_payload(nghttp2_priority *frame,
const uint8_t *payload,
size_t payloadlen)
{
frame->pri = nghttp2_get_uint32(payload) & NGHTTP2_PRIORITY_MASK;
}
ssize_t nghttp2_frame_pack_rst_stream(uint8_t **buf_ptr, size_t *buflen_ptr,
nghttp2_rst_stream *frame)
{
ssize_t framelen = NGHTTP2_FRAME_HEAD_LENGTH + 4;
int r;
r = nghttp2_reserve_buffer(buf_ptr, buflen_ptr, framelen);
if(r != 0) {
return r;
}
memset(*buf_ptr, 0, framelen);
nghttp2_frame_pack_frame_hd(*buf_ptr, &frame->hd);
nghttp2_put_uint32be(&(*buf_ptr)[8], frame->error_code);
return framelen;
}
void nghttp2_frame_unpack_rst_stream_payload(nghttp2_rst_stream *frame,
const uint8_t *payload,
size_t payloadlen)
{
frame->error_code = nghttp2_get_uint32(payload);
}
ssize_t nghttp2_frame_pack_settings(uint8_t **buf_ptr, size_t *buflen_ptr,
nghttp2_settings *frame)
{
ssize_t framelen = NGHTTP2_FRAME_HEAD_LENGTH + frame->hd.length;
int r;
r = nghttp2_reserve_buffer(buf_ptr, buflen_ptr, framelen);
if(r != 0) {
return r;
}
memset(*buf_ptr, 0, framelen);
nghttp2_frame_pack_frame_hd(*buf_ptr, &frame->hd);
nghttp2_frame_pack_settings_payload(*buf_ptr + 8, frame->iv, frame->niv);
return framelen;
}
size_t nghttp2_frame_pack_settings_payload(uint8_t *buf,
const nghttp2_settings_entry *iv,
size_t niv)
{
size_t i;
for(i = 0; i < niv; ++i, buf += NGHTTP2_FRAME_SETTINGS_ENTRY_LENGTH) {
buf[0] = iv[i].settings_id;
nghttp2_put_uint32be(buf + 1, iv[i].value);
}
return NGHTTP2_FRAME_SETTINGS_ENTRY_LENGTH * niv;
}
int nghttp2_frame_unpack_settings_payload(nghttp2_settings *frame,
nghttp2_settings_entry *iv,
size_t niv)
{
size_t payloadlen = niv * sizeof(nghttp2_settings_entry);
frame->iv = malloc(payloadlen);
if(frame->iv == NULL) {
return NGHTTP2_ERR_NOMEM;
}
memcpy(frame->iv, iv, payloadlen);
frame->niv = niv;
return 0;
}
void nghttp2_frame_unpack_settings_entry(nghttp2_settings_entry *iv,
const uint8_t *payload)
{
iv->settings_id = payload[0];
iv->value = nghttp2_get_uint32(&payload[1]);
}
int nghttp2_frame_unpack_settings_payload2(nghttp2_settings_entry **iv_ptr,
size_t *niv_ptr,
const uint8_t *payload,
size_t payloadlen)
{
size_t i;
*niv_ptr = payloadlen / NGHTTP2_FRAME_SETTINGS_ENTRY_LENGTH;
*iv_ptr = malloc((*niv_ptr)*sizeof(nghttp2_settings_entry));
if(*iv_ptr == NULL) {
return NGHTTP2_ERR_NOMEM;
}
for(i = 0; i < *niv_ptr; ++i) {
size_t off = i * NGHTTP2_FRAME_SETTINGS_ENTRY_LENGTH;
nghttp2_frame_unpack_settings_entry(&(*iv_ptr)[i], &payload[off]);
}
return 0;
}
ssize_t nghttp2_frame_pack_push_promise(uint8_t **buf_ptr,
size_t *buflen_ptr,
size_t *bufoff_ptr,
nghttp2_push_promise *frame,
nghttp2_hd_deflater *deflater)
{
size_t payloadoff = NGHTTP2_FRAME_HEAD_LENGTH + 2;
size_t nv_offset = payloadoff + 4;
ssize_t rv;
size_t payloadlen;
rv = nghttp2_hd_deflate_hd(deflater, buf_ptr, buflen_ptr, nv_offset,
frame->nva, frame->nvlen);
if(rv < 0) {
return rv;
}
payloadlen = 4 + rv;
*bufoff_ptr = 2;
frame->padlen = 0;
frame->hd.length = payloadlen;
/* If frame->nvlen == 0, *buflen_ptr may be smaller than
nv_offset */
rv = nghttp2_reserve_buffer(buf_ptr, buflen_ptr, nv_offset);
if(rv < 0) {
return rv;
}
memset(*buf_ptr + *bufoff_ptr, 0, NGHTTP2_FRAME_HEAD_LENGTH);
/* pack ctrl header after length is determined */
if(NGHTTP2_MAX_FRAME_LENGTH < payloadlen) {
/* Needs CONTINUATION */
nghttp2_frame_hd hd = frame->hd;
hd.flags &= ~NGHTTP2_FLAG_END_HEADERS;
hd.length = NGHTTP2_MAX_FRAME_LENGTH;
nghttp2_frame_pack_frame_hd(*buf_ptr + *bufoff_ptr, &hd);
} else {
nghttp2_frame_pack_frame_hd(*buf_ptr + *bufoff_ptr, &frame->hd);
}
nghttp2_put_uint32be(&(*buf_ptr)[payloadoff], frame->promised_stream_id);
return *bufoff_ptr + NGHTTP2_FRAME_HEAD_LENGTH + frame->hd.length;
}
int nghttp2_frame_unpack_push_promise_payload(nghttp2_push_promise *frame,
const uint8_t *payload,
size_t payloadlen)
{
frame->promised_stream_id = nghttp2_get_uint32(payload) &
NGHTTP2_STREAM_ID_MASK;
frame->nva = NULL;
frame->nvlen = 0;
return 0;
}
ssize_t nghttp2_frame_pack_ping(uint8_t **buf_ptr, size_t *buflen_ptr,
nghttp2_ping *frame)
{
ssize_t framelen = NGHTTP2_FRAME_HEAD_LENGTH + 8;
int r;
r = nghttp2_reserve_buffer(buf_ptr, buflen_ptr, framelen);
if(r != 0) {
return r;
}
memset(*buf_ptr, 0, framelen);
nghttp2_frame_pack_frame_hd(*buf_ptr, &frame->hd);
memcpy(&(*buf_ptr)[8], frame->opaque_data, sizeof(frame->opaque_data));
return framelen;
}
void nghttp2_frame_unpack_ping_payload(nghttp2_ping *frame,
const uint8_t *payload,
size_t payloadlen)
{
memcpy(frame->opaque_data, payload, sizeof(frame->opaque_data));
}
ssize_t nghttp2_frame_pack_goaway(uint8_t **buf_ptr, size_t *buflen_ptr,
nghttp2_goaway *frame)
{
ssize_t framelen = NGHTTP2_FRAME_HEAD_LENGTH + frame->hd.length;
int r;
r = nghttp2_reserve_buffer(buf_ptr, buflen_ptr, framelen);
if(r != 0) {
return r;
}
memset(*buf_ptr, 0, framelen);
nghttp2_frame_pack_frame_hd(*buf_ptr, &frame->hd);
nghttp2_put_uint32be(&(*buf_ptr)[8], frame->last_stream_id);
nghttp2_put_uint32be(&(*buf_ptr)[12], frame->error_code);
memcpy(&(*buf_ptr)[16], frame->opaque_data, frame->opaque_data_len);
return framelen;
}
void nghttp2_frame_unpack_goaway_payload(nghttp2_goaway *frame,
const uint8_t *payload,
size_t payloadlen)
{
frame->last_stream_id = nghttp2_get_uint32(payload) & NGHTTP2_STREAM_ID_MASK;
frame->error_code = nghttp2_get_uint32(payload+4);
/* TODO Currently we don't buffer debug data */
frame->opaque_data = NULL;
frame->opaque_data_len = 0;
}
ssize_t nghttp2_frame_pack_window_update(uint8_t **buf_ptr, size_t *buflen_ptr,
nghttp2_window_update *frame)
{
ssize_t framelen = NGHTTP2_FRAME_HEAD_LENGTH + 4;
int r;
r = nghttp2_reserve_buffer(buf_ptr, buflen_ptr, framelen);
if(r != 0) {
return r;
}
memset(*buf_ptr, 0, framelen);
nghttp2_frame_pack_frame_hd(*buf_ptr, &frame->hd);
nghttp2_put_uint32be(&(*buf_ptr)[8], frame->window_size_increment);
return framelen;
}
void nghttp2_frame_unpack_window_update_payload(nghttp2_window_update *frame,
const uint8_t *payload,
size_t payloadlen)
{
frame->window_size_increment = nghttp2_get_uint32(payload) &
NGHTTP2_WINDOW_SIZE_INCREMENT_MASK;
}
nghttp2_settings_entry* nghttp2_frame_iv_copy(const nghttp2_settings_entry *iv,
size_t niv)
{
nghttp2_settings_entry *iv_copy;
size_t len = niv*sizeof(nghttp2_settings_entry);
iv_copy = malloc(len);
if(iv_copy == NULL) {
return NULL;
}
memcpy(iv_copy, iv, len);
return iv_copy;
}
int nghttp2_nv_equal(const nghttp2_nv *a, const nghttp2_nv *b)
{
return a->namelen == b->namelen && a->valuelen == b->valuelen &&
memcmp(a->name, b->name, a->namelen) == 0 &&
memcmp(a->value, b->value, a->valuelen) == 0;
}
void nghttp2_nv_array_del(nghttp2_nv *nva)
{
free(nva);
}
static int bytes_compar(const uint8_t *a, size_t alen,
const uint8_t *b, size_t blen)
{
if(alen == blen) {
return memcmp(a, b, alen);
} else if(alen < blen) {
int rv = memcmp(a, b, alen);
if(rv == 0) {
return -1;
} else {
return rv;
}
} else {
int rv = memcmp(a, b, blen);
if(rv == 0) {
return 1;
} else {
return rv;
}
}
}
int nghttp2_nv_compare_name(const nghttp2_nv *lhs, const nghttp2_nv *rhs)
{
return bytes_compar(lhs->name, lhs->namelen, rhs->name, rhs->namelen);
}
static int nv_compar(const void *lhs, const void *rhs)
{
const nghttp2_nv *a = (const nghttp2_nv*)lhs;
const nghttp2_nv *b = (const nghttp2_nv*)rhs;
int rv;
rv = bytes_compar(a->name, a->namelen, b->name, b->namelen);
if(rv == 0) {
return bytes_compar(a->value, a->valuelen, b->value, b->valuelen);
}
return rv;
}
void nghttp2_nv_array_sort(nghttp2_nv *nva, size_t nvlen)
{
qsort(nva, nvlen, sizeof(nghttp2_nv), nv_compar);
}
ssize_t nghttp2_nv_array_copy(nghttp2_nv **nva_ptr,
const nghttp2_nv *nva, size_t nvlen)
{
size_t i;
uint8_t *data;
size_t buflen = 0;
nghttp2_nv *p;
for(i = 0; i < nvlen; ++i) {
if(nva[i].namelen > NGHTTP2_HD_MAX_NAME ||
nva[i].valuelen > NGHTTP2_HD_MAX_VALUE) {
return NGHTTP2_ERR_INVALID_ARGUMENT;
}
buflen += nva[i].namelen + nva[i].valuelen;
}
/* If all name/value pair is 0-length, remove them */
if(nvlen == 0 || buflen == 0) {
*nva_ptr = NULL;
return 0;
}
buflen += sizeof(nghttp2_nv)*nvlen;
*nva_ptr = malloc(buflen);
if(*nva_ptr == NULL) {
return NGHTTP2_ERR_NOMEM;
}
p = *nva_ptr;
data = (uint8_t*)(*nva_ptr) + sizeof(nghttp2_nv)*nvlen;
for(i = 0; i < nvlen; ++i) {
memcpy(data, nva[i].name, nva[i].namelen);
p->name = data;
p->namelen = nva[i].namelen;
nghttp2_downcase(p->name, p->namelen);
data += nva[i].namelen;
memcpy(data, nva[i].value, nva[i].valuelen);
p->value = data;
p->valuelen = nva[i].valuelen;
data += nva[i].valuelen;
++p;
}
return nvlen;
}
int nghttp2_iv_check(const nghttp2_settings_entry *iv, size_t niv)
{
size_t i;
for(i = 0; i < niv; ++i) {
switch(iv[i].settings_id) {
case NGHTTP2_SETTINGS_HEADER_TABLE_SIZE:
case NGHTTP2_SETTINGS_MAX_CONCURRENT_STREAMS:
break;
case NGHTTP2_SETTINGS_ENABLE_PUSH:
if(iv[i].value != 0 && iv[i].value != 1) {
return 0;
}
break;
case NGHTTP2_SETTINGS_INITIAL_WINDOW_SIZE:
if(iv[i].value > (uint32_t)NGHTTP2_MAX_WINDOW_SIZE) {
return 0;
}
break;
default:
return 0;
}
}
return 1;
}
int nghttp2_frame_add_pad(uint8_t **buf_ptr, size_t *buflen_ptr,
size_t *bufoff_ptr,
uint8_t *flags_ptr,
size_t payloadlen,
size_t padlen)
{
int rv;
size_t trail_padlen = 0;
/* extra 2 bytes for PAD_HIGH and PAD_LOW. */
size_t trail_padoff = *bufoff_ptr + NGHTTP2_FRAME_HEAD_LENGTH + payloadlen;
if(padlen > 257) {
uint8_t *p;
*bufoff_ptr -= 2;
trail_padlen = padlen - 2;
*flags_ptr |= NGHTTP2_FLAG_PAD_HIGH | NGHTTP2_FLAG_PAD_LOW;
p = *buf_ptr + *bufoff_ptr + NGHTTP2_FRAME_HEAD_LENGTH;
*p++ = trail_padlen >> 8;
*p = trail_padlen & 0xff;
} else if(padlen > 0) {
--*bufoff_ptr;
trail_padlen = padlen - 1;
*flags_ptr |= NGHTTP2_FLAG_PAD_LOW;
(*buf_ptr)[*bufoff_ptr + NGHTTP2_FRAME_HEAD_LENGTH] = trail_padlen;
} else {
return 0;
}
rv = nghttp2_reserve_buffer(buf_ptr, buflen_ptr,
trail_padoff + trail_padlen);
if(rv != 0) {
return rv;
}
/* We have to zero out padding bytes so that we won't reveal the
possible internal data to the remote peer */
memset((*buf_ptr) + trail_padoff, 0, trail_padlen);
return 0;
}
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