deps: add nghttp2 dependency

PR-URL: https://github.com/nodejs/node/pull/14239
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>

1 files changed, 993 insertions, 0 deletions

diff --git a/deps/nghttp2/lib/nghttp2_frame.c b/deps/nghttp2/lib/nghttp2_frame.c
new file mode 100644
index 0000000000..90efaff531
--- /dev/null
+++ b/deps/nghttp2/lib/nghttp2_frame.c
@@ -0,0 +1,993 @@
+/*
+ * 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_frame.h"
+
+#include <string.h>
+#include <assert.h>
+#include <stdio.h>
+#include <errno.h>
+
+#include "nghttp2_helper.h"
+#include "nghttp2_net.h"
+#include "nghttp2_priority_spec.h"
+#include "nghttp2_debug.h"
+
+void nghttp2_frame_pack_frame_hd(uint8_t *buf, const nghttp2_frame_hd *hd) {
+  nghttp2_put_uint32be(&buf[0], (uint32_t)(hd->length << 8));
+  buf[3] = hd->type;
+  buf[4] = hd->flags;
+  nghttp2_put_uint32be(&buf[5], (uint32_t)hd->stream_id);
+  /* ignore hd->reserved for now */
+}
+
+void nghttp2_frame_unpack_frame_hd(nghttp2_frame_hd *hd, const uint8_t *buf) {
+  hd->length = nghttp2_get_uint32(&buf[0]) >> 8;
+  hd->type = buf[3];
+  hd->flags = buf[4];
+  hd->stream_id = nghttp2_get_uint32(&buf[5]) & NGHTTP2_STREAM_ID_MASK;
+  hd->reserved = 0;
+}
+
+void nghttp2_frame_hd_init(nghttp2_frame_hd *hd, size_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;
+  hd->reserved = 0;
+}
+
+void nghttp2_frame_headers_init(nghttp2_headers *frame, uint8_t flags,
+                                int32_t stream_id, nghttp2_headers_category cat,
+                                const nghttp2_priority_spec *pri_spec,
+                                nghttp2_nv *nva, size_t nvlen) {
+  nghttp2_frame_hd_init(&frame->hd, 0, NGHTTP2_HEADERS, flags, stream_id);
+  frame->padlen = 0;
+  frame->nva = nva;
+  frame->nvlen = nvlen;
+  frame->cat = cat;
+
+  if (pri_spec) {
+    frame->pri_spec = *pri_spec;
+  } else {
+    nghttp2_priority_spec_default_init(&frame->pri_spec);
+  }
+}
+
+void nghttp2_frame_headers_free(nghttp2_headers *frame, nghttp2_mem *mem) {
+  nghttp2_nv_array_del(frame->nva, mem);
+}
+
+void nghttp2_frame_priority_init(nghttp2_priority *frame, int32_t stream_id,
+                                 const nghttp2_priority_spec *pri_spec) {
+  nghttp2_frame_hd_init(&frame->hd, NGHTTP2_PRIORITY_SPECLEN, NGHTTP2_PRIORITY,
+                        NGHTTP2_FLAG_NONE, stream_id);
+  frame->pri_spec = *pri_spec;
+}
+
+void nghttp2_frame_priority_free(nghttp2_priority *frame) { (void)frame; }
+
+void nghttp2_frame_rst_stream_init(nghttp2_rst_stream *frame, int32_t stream_id,
+                                   uint32_t error_code) {
+  nghttp2_frame_hd_init(&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)frame; }
+
+void nghttp2_frame_settings_init(nghttp2_settings *frame, uint8_t flags,
+                                 nghttp2_settings_entry *iv, size_t niv) {
+  nghttp2_frame_hd_init(&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, nghttp2_mem *mem) {
+  nghttp2_mem_free(mem, 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) {
+  nghttp2_frame_hd_init(&frame->hd, 0, NGHTTP2_PUSH_PROMISE, flags, stream_id);
+  frame->padlen = 0;
+  frame->nva = nva;
+  frame->nvlen = nvlen;
+  frame->promised_stream_id = promised_stream_id;
+  frame->reserved = 0;
+}
+
+void nghttp2_frame_push_promise_free(nghttp2_push_promise *frame,
+                                     nghttp2_mem *mem) {
+  nghttp2_nv_array_del(frame->nva, mem);
+}
+
+void nghttp2_frame_ping_init(nghttp2_ping *frame, uint8_t flags,
+                             const uint8_t *opaque_data) {
+  nghttp2_frame_hd_init(&frame->hd, 8, NGHTTP2_PING, flags, 0);
+  if (opaque_data) {
+    memcpy(frame->opaque_data, opaque_data, sizeof(frame->opaque_data));
+  } else {
+    memset(frame->opaque_data, 0, sizeof(frame->opaque_data));
+  }
+}
+
+void nghttp2_frame_ping_free(nghttp2_ping *frame) { (void)frame; }
+
+void nghttp2_frame_goaway_init(nghttp2_goaway *frame, int32_t last_stream_id,
+                               uint32_t error_code, uint8_t *opaque_data,
+                               size_t opaque_data_len) {
+  nghttp2_frame_hd_init(&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;
+  frame->reserved = 0;
+}
+
+void nghttp2_frame_goaway_free(nghttp2_goaway *frame, nghttp2_mem *mem) {
+  nghttp2_mem_free(mem, 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) {
+  nghttp2_frame_hd_init(&frame->hd, 4, NGHTTP2_WINDOW_UPDATE, flags, stream_id);
+  frame->window_size_increment = window_size_increment;
+  frame->reserved = 0;
+}
+
+void nghttp2_frame_window_update_free(nghttp2_window_update *frame) {
+  (void)frame;
+}
+
+size_t nghttp2_frame_trail_padlen(nghttp2_frame *frame, size_t padlen) {
+  /* We have iframe->padlen == 0, but iframe->frame.hd.flags may have
+     NGHTTP2_FLAG_PADDED set.  This happens when receiving
+     CONTINUATION frame, since we don't reset flags after HEADERS was
+     received. */
+  if (padlen == 0) {
+    return 0;
+  }
+  return padlen - ((frame->hd.flags & NGHTTP2_FLAG_PADDED) > 0);
+}
+
+void nghttp2_frame_data_init(nghttp2_data *frame, uint8_t flags,
+                             int32_t stream_id) {
+  /* At this moment, the length of DATA frame is unknown */
+  nghttp2_frame_hd_init(&frame->hd, 0, NGHTTP2_DATA, flags, stream_id);
+  frame->padlen = 0;
+}
+
+void nghttp2_frame_data_free(nghttp2_data *frame) { (void)frame; }
+
+void nghttp2_frame_extension_init(nghttp2_extension *frame, uint8_t type,
+                                  uint8_t flags, int32_t stream_id,
+                                  void *payload) {
+  nghttp2_frame_hd_init(&frame->hd, 0, type, flags, stream_id);
+  frame->payload = payload;
+}
+
+void nghttp2_frame_extension_free(nghttp2_extension *frame) { (void)frame; }
+
+void nghttp2_frame_altsvc_init(nghttp2_extension *frame, int32_t stream_id,
+                               uint8_t *origin, size_t origin_len,
+                               uint8_t *field_value, size_t field_value_len) {
+  nghttp2_ext_altsvc *altsvc;
+
+  nghttp2_frame_hd_init(&frame->hd, 2 + origin_len + field_value_len,
+                        NGHTTP2_ALTSVC, NGHTTP2_FLAG_NONE, stream_id);
+
+  altsvc = frame->payload;
+  altsvc->origin = origin;
+  altsvc->origin_len = origin_len;
+  altsvc->field_value = field_value;
+  altsvc->field_value_len = field_value_len;
+}
+
+void nghttp2_frame_altsvc_free(nghttp2_extension *frame, nghttp2_mem *mem) {
+  nghttp2_ext_altsvc *altsvc;
+
+  altsvc = frame->payload;
+  /* We use the same buffer for altsvc->origin and
+     altsvc->field_value. */
+  nghttp2_mem_free(mem, altsvc->origin);
+}
+
+size_t nghttp2_frame_priority_len(uint8_t flags) {
+  if (flags & NGHTTP2_FLAG_PRIORITY) {
+    return NGHTTP2_PRIORITY_SPECLEN;
+  }
+
+  return 0;
+}
+
+size_t nghttp2_frame_headers_payload_nv_offset(nghttp2_headers *frame) {
+  return nghttp2_frame_priority_len(frame->hd.flags);
+}
+
+/*
+ * Call this function after payload was serialized, but not before
+ * changing buf->pos and serializing frame header.
+ *
+ * This function assumes bufs->cur points to the last buf chain of the
+ * frame(s).
+ *
+ * This function serializes frame header for HEADERS/PUSH_PROMISE and
+ * handles their successive CONTINUATION frames.
+ *
+ * We don't process any padding here.
+ */
+static int frame_pack_headers_shared(nghttp2_bufs *bufs,
+                                     nghttp2_frame_hd *frame_hd) {
+  nghttp2_buf *buf;
+  nghttp2_buf_chain *ci, *ce;
+  nghttp2_frame_hd hd;
+
+  buf = &bufs->head->buf;
+
+  hd = *frame_hd;
+  hd.length = nghttp2_buf_len(buf);
+
+  DEBUGF("send: HEADERS/PUSH_PROMISE, payloadlen=%zu\n", hd.length);
+
+  /* We have multiple frame buffers, which means one or more
+     CONTINUATION frame is involved. Remove END_HEADERS flag from the
+     first frame. */
+  if (bufs->head != bufs->cur) {
+    hd.flags = (uint8_t)(hd.flags & ~NGHTTP2_FLAG_END_HEADERS);
+  }
+
+  buf->pos -= NGHTTP2_FRAME_HDLEN;
+  nghttp2_frame_pack_frame_hd(buf->pos, &hd);
+
+  if (bufs->head != bufs->cur) {
+    /* 2nd and later frames are CONTINUATION frames. */
+    hd.type = NGHTTP2_CONTINUATION;
+    /* We don't have no flags except for last CONTINUATION */
+    hd.flags = NGHTTP2_FLAG_NONE;
+
+    ce = bufs->cur;
+
+    for (ci = bufs->head->next; ci != ce; ci = ci->next) {
+      buf = &ci->buf;
+
+      hd.length = nghttp2_buf_len(buf);
+
+      DEBUGF("send: int CONTINUATION, payloadlen=%zu\n", hd.length);
+
+      buf->pos -= NGHTTP2_FRAME_HDLEN;
+      nghttp2_frame_pack_frame_hd(buf->pos, &hd);
+    }
+
+    buf = &ci->buf;
+    hd.length = nghttp2_buf_len(buf);
+    /* Set END_HEADERS flag for last CONTINUATION */
+    hd.flags = NGHTTP2_FLAG_END_HEADERS;
+
+    DEBUGF("send: last CONTINUATION, payloadlen=%zu\n", hd.length);
+
+    buf->pos -= NGHTTP2_FRAME_HDLEN;
+    nghttp2_frame_pack_frame_hd(buf->pos, &hd);
+  }
+
+  return 0;
+}
+
+int nghttp2_frame_pack_headers(nghttp2_bufs *bufs, nghttp2_headers *frame,
+                               nghttp2_hd_deflater *deflater) {
+  size_t nv_offset;
+  int rv;
+  nghttp2_buf *buf;
+
+  assert(bufs->head == bufs->cur);
+
+  nv_offset = nghttp2_frame_headers_payload_nv_offset(frame);
+
+  buf = &bufs->cur->buf;
+
+  buf->pos += nv_offset;
+  buf->last = buf->pos;
+
+  /* This call will adjust buf->last to the correct position */
+  rv = nghttp2_hd_deflate_hd_bufs(deflater, bufs, frame->nva, frame->nvlen);
+
+  if (rv == NGHTTP2_ERR_BUFFER_ERROR) {
+    rv = NGHTTP2_ERR_HEADER_COMP;
+  }
+
+  buf->pos -= nv_offset;
+
+  if (rv != 0) {
+    return rv;
+  }
+
+  if (frame->hd.flags & NGHTTP2_FLAG_PRIORITY) {
+    nghttp2_frame_pack_priority_spec(buf->pos, &frame->pri_spec);
+  }
+
+  frame->padlen = 0;
+  frame->hd.length = nghttp2_bufs_len(bufs);
+
+  return frame_pack_headers_shared(bufs, &frame->hd);
+}
+
+void nghttp2_frame_pack_priority_spec(uint8_t *buf,
+                                      const nghttp2_priority_spec *pri_spec) {
+  nghttp2_put_uint32be(buf, (uint32_t)pri_spec->stream_id);
+  if (pri_spec->exclusive) {
+    buf[0] |= 0x80;
+  }
+  buf[4] = (uint8_t)(pri_spec->weight - 1);
+}
+
+void nghttp2_frame_unpack_priority_spec(nghttp2_priority_spec *pri_spec,
+                                        const uint8_t *payload) {
+  int32_t dep_stream_id;
+  uint8_t exclusive;
+  int32_t weight;
+
+  dep_stream_id = nghttp2_get_uint32(payload) & NGHTTP2_STREAM_ID_MASK;
+  exclusive = (payload[0] & 0x80) > 0;
+  weight = payload[4] + 1;
+
+  nghttp2_priority_spec_init(pri_spec, dep_stream_id, weight, exclusive);
+}
+
+int nghttp2_frame_unpack_headers_payload(nghttp2_headers *frame,
+                                         const uint8_t *payload) {
+  if (frame->hd.flags & NGHTTP2_FLAG_PRIORITY) {
+    nghttp2_frame_unpack_priority_spec(&frame->pri_spec, payload);
+  } else {
+    nghttp2_priority_spec_default_init(&frame->pri_spec);
+  }
+
+  frame->nva = NULL;
+  frame->nvlen = 0;
+
+  return 0;
+}
+
+int nghttp2_frame_pack_priority(nghttp2_bufs *bufs, nghttp2_priority *frame) {
+  nghttp2_buf *buf;
+
+  assert(bufs->head == bufs->cur);
+
+  buf = &bufs->head->buf;
+
+  assert(nghttp2_buf_avail(buf) >= NGHTTP2_PRIORITY_SPECLEN);
+
+  buf->pos -= NGHTTP2_FRAME_HDLEN;
+
+  nghttp2_frame_pack_frame_hd(buf->pos, &frame->hd);
+
+  nghttp2_frame_pack_priority_spec(buf->last, &frame->pri_spec);
+
+  buf->last += NGHTTP2_PRIORITY_SPECLEN;
+
+  return 0;
+}
+
+void nghttp2_frame_unpack_priority_payload(nghttp2_priority *frame,
+                                           const uint8_t *payload) {
+  nghttp2_frame_unpack_priority_spec(&frame->pri_spec, payload);
+}
+
+int nghttp2_frame_pack_rst_stream(nghttp2_bufs *bufs,
+                                  nghttp2_rst_stream *frame) {
+  nghttp2_buf *buf;
+
+  assert(bufs->head == bufs->cur);
+
+  buf = &bufs->head->buf;
+
+  assert(nghttp2_buf_avail(buf) >= 4);
+
+  buf->pos -= NGHTTP2_FRAME_HDLEN;
+
+  nghttp2_frame_pack_frame_hd(buf->pos, &frame->hd);
+
+  nghttp2_put_uint32be(buf->last, frame->error_code);
+  buf->last += 4;
+
+  return 0;
+}
+
+void nghttp2_frame_unpack_rst_stream_payload(nghttp2_rst_stream *frame,
+                                             const uint8_t *payload) {
+  frame->error_code = nghttp2_get_uint32(payload);
+}
+
+int nghttp2_frame_pack_settings(nghttp2_bufs *bufs, nghttp2_settings *frame) {
+  nghttp2_buf *buf;
+
+  assert(bufs->head == bufs->cur);
+
+  buf = &bufs->head->buf;
+
+  if (nghttp2_buf_avail(buf) < frame->hd.length) {
+    return NGHTTP2_ERR_FRAME_SIZE_ERROR;
+  }
+
+  buf->pos -= NGHTTP2_FRAME_HDLEN;
+
+  nghttp2_frame_pack_frame_hd(buf->pos, &frame->hd);
+
+  buf->last +=
+      nghttp2_frame_pack_settings_payload(buf->last, frame->iv, frame->niv);
+
+  return 0;
+}
+
+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) {
+    nghttp2_put_uint16be(buf, (uint16_t)iv[i].settings_id);
+    nghttp2_put_uint32be(buf + 2, iv[i].value);
+  }
+  return NGHTTP2_FRAME_SETTINGS_ENTRY_LENGTH * niv;
+}
+
+void nghttp2_frame_unpack_settings_payload(nghttp2_settings *frame,
+                                           nghttp2_settings_entry *iv,
+                                           size_t niv) {
+  frame->iv = iv;
+  frame->niv = niv;
+}
+
+void nghttp2_frame_unpack_settings_entry(nghttp2_settings_entry *iv,
+                                         const uint8_t *payload) {
+  iv->settings_id = nghttp2_get_uint16(&payload[0]);
+  iv->value = nghttp2_get_uint32(&payload[2]);
+}
+
+int nghttp2_frame_unpack_settings_payload2(nghttp2_settings_entry **iv_ptr,
+                                           size_t *niv_ptr,
+                                           const uint8_t *payload,
+                                           size_t payloadlen,
+                                           nghttp2_mem *mem) {
+  size_t i;
+
+  *niv_ptr = payloadlen / NGHTTP2_FRAME_SETTINGS_ENTRY_LENGTH;
+
+  if (*niv_ptr == 0) {
+    *iv_ptr = NULL;
+
+    return 0;
+  }
+
+  *iv_ptr =
+      nghttp2_mem_malloc(mem, (*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;
+}
+
+int nghttp2_frame_pack_push_promise(nghttp2_bufs *bufs,
+                                    nghttp2_push_promise *frame,
+                                    nghttp2_hd_deflater *deflater) {
+  size_t nv_offset = 4;
+  int rv;
+  nghttp2_buf *buf;
+
+  assert(bufs->head == bufs->cur);
+
+  buf = &bufs->cur->buf;
+
+  buf->pos += nv_offset;
+  buf->last = buf->pos;
+
+  /* This call will adjust buf->last to the correct position */
+  rv = nghttp2_hd_deflate_hd_bufs(deflater, bufs, frame->nva, frame->nvlen);
+
+  if (rv == NGHTTP2_ERR_BUFFER_ERROR) {
+    rv = NGHTTP2_ERR_HEADER_COMP;
+  }
+
+  buf->pos -= nv_offset;
+
+  if (rv != 0) {
+    return rv;
+  }
+
+  nghttp2_put_uint32be(buf->pos, (uint32_t)frame->promised_stream_id);
+
+  frame->padlen = 0;
+  frame->hd.length = nghttp2_bufs_len(bufs);
+
+  return frame_pack_headers_shared(bufs, &frame->hd);
+}
+
+int nghttp2_frame_unpack_push_promise_payload(nghttp2_push_promise *frame,
+                                              const uint8_t *payload) {
+  frame->promised_stream_id =
+      nghttp2_get_uint32(payload) & NGHTTP2_STREAM_ID_MASK;
+  frame->nva = NULL;
+  frame->nvlen = 0;
+  return 0;
+}
+
+int nghttp2_frame_pack_ping(nghttp2_bufs *bufs, nghttp2_ping *frame) {
+  nghttp2_buf *buf;
+
+  assert(bufs->head == bufs->cur);
+
+  buf = &bufs->head->buf;
+
+  assert(nghttp2_buf_avail(buf) >= 8);
+
+  buf->pos -= NGHTTP2_FRAME_HDLEN;
+
+  nghttp2_frame_pack_frame_hd(buf->pos, &frame->hd);
+
+  buf->last =
+      nghttp2_cpymem(buf->last, frame->opaque_data, sizeof(frame->opaque_data));
+
+  return 0;
+}
+
+void nghttp2_frame_unpack_ping_payload(nghttp2_ping *frame,
+                                       const uint8_t *payload) {
+  memcpy(frame->opaque_data, payload, sizeof(frame->opaque_data));
+}
+
+int nghttp2_frame_pack_goaway(nghttp2_bufs *bufs, nghttp2_goaway *frame) {
+  int rv;
+  nghttp2_buf *buf;
+
+  assert(bufs->head == bufs->cur);
+
+  buf = &bufs->head->buf;
+
+  buf->pos -= NGHTTP2_FRAME_HDLEN;
+
+  nghttp2_frame_pack_frame_hd(buf->pos, &frame->hd);
+
+  nghttp2_put_uint32be(buf->last, (uint32_t)frame->last_stream_id);
+  buf->last += 4;
+
+  nghttp2_put_uint32be(buf->last, frame->error_code);
+  buf->last += 4;
+
+  rv = nghttp2_bufs_add(bufs, frame->opaque_data, frame->opaque_data_len);
+
+  if (rv == NGHTTP2_ERR_BUFFER_ERROR) {
+    return NGHTTP2_ERR_FRAME_SIZE_ERROR;
+  }
+
+  if (rv != 0) {
+    return rv;
+  }
+
+  return 0;
+}
+
+void nghttp2_frame_unpack_goaway_payload(nghttp2_goaway *frame,
+                                         const uint8_t *payload,
+                                         uint8_t *var_gift_payload,
+                                         size_t var_gift_payloadlen) {
+  frame->last_stream_id = nghttp2_get_uint32(payload) & NGHTTP2_STREAM_ID_MASK;
+  frame->error_code = nghttp2_get_uint32(payload + 4);
+
+  frame->opaque_data = var_gift_payload;
+  frame->opaque_data_len = var_gift_payloadlen;
+}
+
+int nghttp2_frame_unpack_goaway_payload2(nghttp2_goaway *frame,
+                                         const uint8_t *payload,
+                                         size_t payloadlen, nghttp2_mem *mem) {
+  uint8_t *var_gift_payload;
+  size_t var_gift_payloadlen;
+
+  if (payloadlen > 8) {
+    var_gift_payloadlen = payloadlen - 8;
+  } else {
+    var_gift_payloadlen = 0;
+  }
+
+  payloadlen -= var_gift_payloadlen;
+
+  if (!var_gift_payloadlen) {
+    var_gift_payload = NULL;
+  } else {
+    var_gift_payload = nghttp2_mem_malloc(mem, var_gift_payloadlen);
+
+    if (var_gift_payload == NULL) {
+      return NGHTTP2_ERR_NOMEM;
+    }
+
+    memcpy(var_gift_payload, payload + 8, var_gift_payloadlen);
+  }
+
+  nghttp2_frame_unpack_goaway_payload(frame, payload, var_gift_payload,
+                                      var_gift_payloadlen);
+
+  return 0;
+}
+
+int nghttp2_frame_pack_window_update(nghttp2_bufs *bufs,
+                                     nghttp2_window_update *frame) {
+  nghttp2_buf *buf;
+
+  assert(bufs->head == bufs->cur);
+
+  buf = &bufs->head->buf;
+
+  assert(nghttp2_buf_avail(buf) >= 4);
+
+  buf->pos -= NGHTTP2_FRAME_HDLEN;
+
+  nghttp2_frame_pack_frame_hd(buf->pos, &frame->hd);
+
+  nghttp2_put_uint32be(buf->last, (uint32_t)frame->window_size_increment);
+  buf->last += 4;
+
+  return 0;
+}
+
+void nghttp2_frame_unpack_window_update_payload(nghttp2_window_update *frame,
+                                                const uint8_t *payload) {
+  frame->window_size_increment =
+      nghttp2_get_uint32(payload) & NGHTTP2_WINDOW_SIZE_INCREMENT_MASK;
+}
+
+int nghttp2_frame_pack_altsvc(nghttp2_bufs *bufs, nghttp2_extension *frame) {
+  int rv;
+  nghttp2_buf *buf;
+  nghttp2_ext_altsvc *altsvc;
+
+  altsvc = frame->payload;
+
+  buf = &bufs->head->buf;
+
+  assert(nghttp2_buf_avail(buf) >=
+         2 + altsvc->origin_len + altsvc->field_value_len);
+
+  buf->pos -= NGHTTP2_FRAME_HDLEN;
+
+  nghttp2_frame_pack_frame_hd(buf->pos, &frame->hd);
+
+  nghttp2_put_uint16be(buf->last, (uint16_t)altsvc->origin_len);
+  buf->last += 2;
+
+  rv = nghttp2_bufs_add(bufs, altsvc->origin, altsvc->origin_len);
+
+  assert(rv == 0);
+
+  rv = nghttp2_bufs_add(bufs, altsvc->field_value, altsvc->field_value_len);
+
+  assert(rv == 0);
+
+  return 0;
+}
+
+void nghttp2_frame_unpack_altsvc_payload(nghttp2_extension *frame,
+                                         size_t origin_len, uint8_t *payload,
+                                         size_t payloadlen) {
+  nghttp2_ext_altsvc *altsvc;
+  uint8_t *p;
+
+  altsvc = frame->payload;
+  p = payload;
+
+  altsvc->origin = p;
+
+  p += origin_len;
+
+  altsvc->origin_len = origin_len;
+
+  altsvc->field_value = p;
+  altsvc->field_value_len = (size_t)(payload + payloadlen - p);
+}
+
+int nghttp2_frame_unpack_altsvc_payload2(nghttp2_extension *frame,
+                                         const uint8_t *payload,
+                                         size_t payloadlen, nghttp2_mem *mem) {
+  uint8_t *buf;
+  size_t origin_len;
+
+  if (payloadlen < 2) {
+    return NGHTTP2_FRAME_SIZE_ERROR;
+  }
+
+  origin_len = nghttp2_get_uint16(payload);
+
+  buf = nghttp2_mem_malloc(mem, payloadlen - 2);
+  if (!buf) {
+    return NGHTTP2_ERR_NOMEM;
+  }
+
+  nghttp2_cpymem(buf, payload + 2, payloadlen - 2);
+
+  nghttp2_frame_unpack_altsvc_payload(frame, origin_len, buf, payloadlen - 2);
+
+  return 0;
+}
+
+nghttp2_settings_entry *nghttp2_frame_iv_copy(const nghttp2_settings_entry *iv,
+                                              size_t niv, nghttp2_mem *mem) {
+  nghttp2_settings_entry *iv_copy;
+  size_t len = niv * sizeof(nghttp2_settings_entry);
+
+  if (len == 0) {
+    return NULL;
+  }
+
+  iv_copy = nghttp2_mem_malloc(mem, 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, nghttp2_mem *mem) {
+  nghttp2_mem_free(mem, nva);
+}
+
+static int bytes_compar(const uint8_t *a, size_t alen, const uint8_t *b,
+                        size_t blen) {
+  int rv;
+
+  if (alen == blen) {
+    return memcmp(a, b, alen);
+  }
+
+  if (alen < blen) {
+    rv = memcmp(a, b, alen);
+
+    if (rv == 0) {
+      return -1;
+    }
+
+    return rv;
+  }
+
+  rv = memcmp(a, b, blen);
+
+  if (rv == 0) {
+    return 1;
+  }
+
+  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);
+}
+
+int nghttp2_nv_array_copy(nghttp2_nv **nva_ptr, const nghttp2_nv *nva,
+                          size_t nvlen, nghttp2_mem *mem) {
+  size_t i;
+  uint8_t *data = NULL;
+  size_t buflen = 0;
+  nghttp2_nv *p;
+
+  if (nvlen == 0) {
+    *nva_ptr = NULL;
+
+    return 0;
+  }
+
+  for (i = 0; i < nvlen; ++i) {
+    /* + 1 for null-termination */
+    if ((nva[i].flags & NGHTTP2_NV_FLAG_NO_COPY_NAME) == 0) {
+      buflen += nva[i].namelen + 1;
+    }
+    if ((nva[i].flags & NGHTTP2_NV_FLAG_NO_COPY_VALUE) == 0) {
+      buflen += nva[i].valuelen + 1;
+    }
+  }
+
+  buflen += sizeof(nghttp2_nv) * nvlen;
+
+  *nva_ptr = nghttp2_mem_malloc(mem, 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) {
+    p->flags = nva[i].flags;
+
+    if (nva[i].flags & NGHTTP2_NV_FLAG_NO_COPY_NAME) {
+      p->name = nva[i].name;
+      p->namelen = nva[i].namelen;
+    } else {
+      if (nva[i].namelen) {
+        memcpy(data, nva[i].name, nva[i].namelen);
+      }
+      p->name = data;
+      p->namelen = nva[i].namelen;
+      data[p->namelen] = '\0';
+      nghttp2_downcase(p->name, p->namelen);
+      data += nva[i].namelen + 1;
+    }
+
+    if (nva[i].flags & NGHTTP2_NV_FLAG_NO_COPY_VALUE) {
+      p->value = nva[i].value;
+      p->valuelen = nva[i].valuelen;
+    } else {
+      if (nva[i].valuelen) {
+        memcpy(data, nva[i].value, nva[i].valuelen);
+      }
+      p->value = data;
+      p->valuelen = nva[i].valuelen;
+      data[p->valuelen] = '\0';
+      data += nva[i].valuelen + 1;
+    }
+
+    ++p;
+  }
+  return 0;
+}
+
+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:
+      break;
+    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;
+    case NGHTTP2_SETTINGS_MAX_FRAME_SIZE:
+      if (iv[i].value < NGHTTP2_MAX_FRAME_SIZE_MIN ||
+          iv[i].value > NGHTTP2_MAX_FRAME_SIZE_MAX) {
+        return 0;
+      }
+      break;
+    case NGHTTP2_SETTINGS_MAX_HEADER_LIST_SIZE:
+      break;
+    }
+  }
+  return 1;
+}
+
+static void frame_set_pad(nghttp2_buf *buf, size_t padlen, int framehd_only) {
+  size_t trail_padlen;
+  size_t newlen;
+
+  DEBUGF("send: padlen=%zu, shift left 1 bytes\n", padlen);
+
+  memmove(buf->pos - 1, buf->pos, NGHTTP2_FRAME_HDLEN);
+
+  --buf->pos;
+
+  buf->pos[4] |= NGHTTP2_FLAG_PADDED;
+
+  newlen = (nghttp2_get_uint32(buf->pos) >> 8) + padlen;
+  nghttp2_put_uint32be(buf->pos, (uint32_t)((newlen << 8) + buf->pos[3]));
+
+  if (framehd_only) {
+    return;
+  }
+
+  trail_padlen = padlen - 1;
+  buf->pos[NGHTTP2_FRAME_HDLEN] = (uint8_t)trail_padlen;
+
+  /* zero out padding */
+  memset(buf->last, 0, trail_padlen);
+  /* extend buffers trail_padlen bytes, since we ate previous padlen -
+     trail_padlen byte(s) */
+  buf->last += trail_padlen;
+}
+
+int nghttp2_frame_add_pad(nghttp2_bufs *bufs, nghttp2_frame_hd *hd,
+                          size_t padlen, int framehd_only) {
+  nghttp2_buf *buf;
+
+  if (padlen == 0) {
+    DEBUGF("send: padlen = 0, nothing to do\n");
+
+    return 0;
+  }
+
+  /*
+   * We have arranged bufs like this:
+   *
+   *  0                   1                   2                   3
+   *  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+   * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+   * | |Frame header     | Frame payload...                          :
+   * +-+-----------------+-------------------------------------------+
+   * | |Frame header     | Frame payload...                          :
+   * +-+-----------------+-------------------------------------------+
+   * | |Frame header     | Frame payload...                          :
+   * +-+-----------------+-------------------------------------------+
+   *
+   * We arranged padding so that it is included in the first frame
+   * completely.  For padded frame, we are going to adjust buf->pos of
+   * frame which includes padding and serialize (memmove) frame header
+   * in the correct position.  Also extends buf->last to include
+   * padding.
+   */
+
+  buf = &bufs->head->buf;
+
+  assert(nghttp2_buf_avail(buf) >= padlen - 1);
+
+  frame_set_pad(buf, padlen, framehd_only);
+
+  hd->length += padlen;
+  hd->flags |= NGHTTP2_FLAG_PADDED;
+
+  DEBUGF("send: final payloadlen=%zu, padlen=%zu\n", hd->length, padlen);
+
+  return 0;
+}