src/core/ext/transport/chttp2/transport/frame_data.cc - third_party/grpc - Git at Google

 /*
  *
  * Copyright 2015 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *     http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  *
  */

 #include "src/core/ext/transport/chttp2/transport/frame_data.h"

 #include <string.h>

 #include <grpc/support/alloc.h>
 #include <grpc/support/log.h>
 #include <grpc/support/string_util.h>
 #include <grpc/support/useful.h>
 #include "src/core/ext/transport/chttp2/transport/internal.h"
 #include "src/core/lib/slice/slice_internal.h"
 #include "src/core/lib/slice/slice_string_helpers.h"
 #include "src/core/lib/support/string.h"
 #include "src/core/lib/transport/transport.h"

 grpc_error* grpc_chttp2_data_parser_init(grpc_chttp2_data_parser* parser) {
   parser->state = GRPC_CHTTP2_DATA_FH_0;
   parser->parsing_frame = nullptr;
   return GRPC_ERROR_NONE;
 }

 void grpc_chttp2_data_parser_destroy(grpc_chttp2_data_parser* parser) {
   if (parser->parsing_frame != nullptr) {
     GRPC_ERROR_UNREF(grpc_chttp2_incoming_byte_stream_finished(
         parser->parsing_frame,
         GRPC_ERROR_CREATE_FROM_STATIC_STRING("Parser destroyed"), false));
   }
   GRPC_ERROR_UNREF(parser->error);
 }

 grpc_error* grpc_chttp2_data_parser_begin_frame(grpc_chttp2_data_parser* parser,
                                                 uint8_t flags,
                                                 uint32_t stream_id,
                                                 grpc_chttp2_stream* s) {
   if (flags & ~GRPC_CHTTP2_DATA_FLAG_END_STREAM) {
     char* msg;
     gpr_asprintf(&msg, "unsupported data flags: 0x%02x", flags);
     grpc_error* err =
         grpc_error_set_int(GRPC_ERROR_CREATE_FROM_COPIED_STRING(msg),
                            GRPC_ERROR_INT_STREAM_ID, (intptr_t)stream_id);
     gpr_free(msg);
     return err;
   }

   if (flags & GRPC_CHTTP2_DATA_FLAG_END_STREAM) {
     s->received_last_frame = true;
   } else {
     s->received_last_frame = false;
   }

   return GRPC_ERROR_NONE;
 }

 void grpc_chttp2_encode_data(uint32_t id, grpc_slice_buffer* inbuf,
                              uint32_t write_bytes, int is_eof,
                              grpc_transport_one_way_stats* stats,
                              grpc_slice_buffer* outbuf) {
   grpc_slice hdr;
   uint8_t* p;
   static const size_t header_size = 9;

   hdr = GRPC_SLICE_MALLOC(header_size);
   p = GRPC_SLICE_START_PTR(hdr);
   GPR_ASSERT(write_bytes < (1 << 24));
   *p++ = (uint8_t)(write_bytes >> 16);
   *p++ = (uint8_t)(write_bytes >> 8);
   *p++ = (uint8_t)(write_bytes);
   *p++ = GRPC_CHTTP2_FRAME_DATA;
   *p++ = is_eof ? GRPC_CHTTP2_DATA_FLAG_END_STREAM : 0;
   *p++ = (uint8_t)(id >> 24);
   *p++ = (uint8_t)(id >> 16);
   *p++ = (uint8_t)(id >> 8);
   *p++ = (uint8_t)(id);
   grpc_slice_buffer_add(outbuf, hdr);

   grpc_slice_buffer_move_first_no_ref(inbuf, write_bytes, outbuf);

   stats->framing_bytes += header_size;
   stats->data_bytes += write_bytes;
 }

 grpc_error* grpc_deframe_unprocessed_incoming_frames(
     grpc_chttp2_data_parser* p, grpc_chttp2_stream* s,
     grpc_slice_buffer* slices, grpc_slice* slice_out,
     grpc_byte_stream** stream_out) {
   grpc_error* error = GRPC_ERROR_NONE;
   grpc_chttp2_transport* t = s->t;

   while (slices->count > 0) {
     uint8_t* beg = nullptr;
     uint8_t* end = nullptr;
     uint8_t* cur = nullptr;

     grpc_slice slice = grpc_slice_buffer_take_first(slices);

     beg = GRPC_SLICE_START_PTR(slice);
     end = GRPC_SLICE_END_PTR(slice);
     cur = beg;
     uint32_t message_flags;
     char* msg;

     if (cur == end) {
       grpc_slice_unref_internal(slice);
       continue;
     }

     switch (p->state) {
       case GRPC_CHTTP2_DATA_ERROR:
         p->state = GRPC_CHTTP2_DATA_ERROR;
         grpc_slice_unref_internal(slice);
         return GRPC_ERROR_REF(p->error);
       case GRPC_CHTTP2_DATA_FH_0:
         s->stats.incoming.framing_bytes++;
         p->frame_type = *cur;
         switch (p->frame_type) {
           case 0:
             p->is_frame_compressed = false; /* GPR_FALSE */
             break;
           case 1:
             p->is_frame_compressed = true; /* GPR_TRUE */
             break;
           default:
             gpr_asprintf(&msg, "Bad GRPC frame type 0x%02x", p->frame_type);
             p->error = GRPC_ERROR_CREATE_FROM_COPIED_STRING(msg);
             p->error = grpc_error_set_int(p->error, GRPC_ERROR_INT_STREAM_ID,
                                           (intptr_t)s->id);
             gpr_free(msg);
             msg = grpc_dump_slice(slice, GPR_DUMP_HEX | GPR_DUMP_ASCII);
             p->error = grpc_error_set_str(p->error, GRPC_ERROR_STR_RAW_BYTES,
                                           grpc_slice_from_copied_string(msg));
             gpr_free(msg);
             p->error =
                 grpc_error_set_int(p->error, GRPC_ERROR_INT_OFFSET, cur - beg);
             p->state = GRPC_CHTTP2_DATA_ERROR;
             grpc_slice_unref_internal(slice);
             return GRPC_ERROR_REF(p->error);
         }
         if (++cur == end) {
           p->state = GRPC_CHTTP2_DATA_FH_1;
           grpc_slice_unref_internal(slice);
           continue;
         }
       /* fallthrough */
       case GRPC_CHTTP2_DATA_FH_1:
         s->stats.incoming.framing_bytes++;
         p->frame_size = ((uint32_t)*cur) << 24;
         if (++cur == end) {
           p->state = GRPC_CHTTP2_DATA_FH_2;
           grpc_slice_unref_internal(slice);
           continue;
         }
       /* fallthrough */
       case GRPC_CHTTP2_DATA_FH_2:
         s->stats.incoming.framing_bytes++;
         p->frame_size |= ((uint32_t)*cur) << 16;
         if (++cur == end) {
           p->state = GRPC_CHTTP2_DATA_FH_3;
           grpc_slice_unref_internal(slice);
           continue;
         }
       /* fallthrough */
       case GRPC_CHTTP2_DATA_FH_3:
         s->stats.incoming.framing_bytes++;
         p->frame_size |= ((uint32_t)*cur) << 8;
         if (++cur == end) {
           p->state = GRPC_CHTTP2_DATA_FH_4;
           grpc_slice_unref_internal(slice);
           continue;
         }
       /* fallthrough */
       case GRPC_CHTTP2_DATA_FH_4:
         s->stats.incoming.framing_bytes++;
         GPR_ASSERT(stream_out != nullptr);
         GPR_ASSERT(p->parsing_frame == nullptr);
         p->frame_size |= ((uint32_t)*cur);
         p->state = GRPC_CHTTP2_DATA_FRAME;
         ++cur;
         message_flags = 0;
         if (p->is_frame_compressed) {
           message_flags |= GRPC_WRITE_INTERNAL_COMPRESS;
         }
         p->parsing_frame = grpc_chttp2_incoming_byte_stream_create(
             t, s, p->frame_size, message_flags);
         *stream_out = &p->parsing_frame->base;
         if (p->parsing_frame->remaining_bytes == 0) {
           GRPC_ERROR_UNREF(grpc_chttp2_incoming_byte_stream_finished(
               p->parsing_frame, GRPC_ERROR_NONE, true));
           p->parsing_frame = nullptr;
           p->state = GRPC_CHTTP2_DATA_FH_0;
         }
         s->pending_byte_stream = true;

         if (cur != end) {
           grpc_slice_buffer_undo_take_first(
               slices,
               grpc_slice_sub(slice, (size_t)(cur - beg), (size_t)(end - beg)));
         }
         grpc_slice_unref_internal(slice);
         return GRPC_ERROR_NONE;
       case GRPC_CHTTP2_DATA_FRAME: {
         GPR_ASSERT(p->parsing_frame != nullptr);
         GPR_ASSERT(slice_out != nullptr);
         if (cur == end) {
           grpc_slice_unref_internal(slice);
           continue;
         }
         uint32_t remaining = (uint32_t)(end - cur);
         if (remaining == p->frame_size) {
           s->stats.incoming.data_bytes += remaining;
           if (GRPC_ERROR_NONE != (error = grpc_chttp2_incoming_byte_stream_push(
                                       p->parsing_frame,
                                       grpc_slice_sub(slice, (size_t)(cur - beg),
                                                      (size_t)(end - beg)),
                                       slice_out))) {
             grpc_slice_unref_internal(slice);
             return error;
           }
           if (GRPC_ERROR_NONE !=
               (error = grpc_chttp2_incoming_byte_stream_finished(
                    p->parsing_frame, GRPC_ERROR_NONE, true))) {
             grpc_slice_unref_internal(slice);
             return error;
           }
           p->parsing_frame = nullptr;
           p->state = GRPC_CHTTP2_DATA_FH_0;
           grpc_slice_unref_internal(slice);
           return GRPC_ERROR_NONE;
         } else if (remaining < p->frame_size) {
           s->stats.incoming.data_bytes += remaining;
           if (GRPC_ERROR_NONE != (error = grpc_chttp2_incoming_byte_stream_push(
                                       p->parsing_frame,
                                       grpc_slice_sub(slice, (size_t)(cur - beg),
                                                      (size_t)(end - beg)),
                                       slice_out))) {
             return error;
           }
           p->frame_size -= remaining;
           grpc_slice_unref_internal(slice);
           return GRPC_ERROR_NONE;
         } else {
           GPR_ASSERT(remaining > p->frame_size);
           s->stats.incoming.data_bytes += p->frame_size;
           if (GRPC_ERROR_NONE !=
               (grpc_chttp2_incoming_byte_stream_push(
                   p->parsing_frame,
                   grpc_slice_sub(slice, (size_t)(cur - beg),
                                  (size_t)(cur + p->frame_size - beg)),
                   slice_out))) {
             grpc_slice_unref_internal(slice);
             return error;
           }
           if (GRPC_ERROR_NONE !=
               (error = grpc_chttp2_incoming_byte_stream_finished(
                    p->parsing_frame, GRPC_ERROR_NONE, true))) {
             grpc_slice_unref_internal(slice);
             return error;
           }
           p->parsing_frame = nullptr;
           p->state = GRPC_CHTTP2_DATA_FH_0;
           cur += p->frame_size;
           grpc_slice_buffer_undo_take_first(
               slices,
               grpc_slice_sub(slice, (size_t)(cur - beg), (size_t)(end - beg)));
           grpc_slice_unref_internal(slice);
           return GRPC_ERROR_NONE;
         }
       }
     }
   }

   return GRPC_ERROR_NONE;
 }

 grpc_error* grpc_chttp2_data_parser_parse(void* parser,
                                           grpc_chttp2_transport* t,
                                           grpc_chttp2_stream* s,
                                           grpc_slice slice, int is_last) {
   if (!s->pending_byte_stream) {
     grpc_slice_ref_internal(slice);
     grpc_slice_buffer_add(&s->frame_storage, slice);
     grpc_chttp2_maybe_complete_recv_message(t, s);
   } else if (s->on_next) {
     GPR_ASSERT(s->frame_storage.length == 0);
     grpc_slice_ref_internal(slice);
     grpc_slice_buffer_add(&s->unprocessed_incoming_frames_buffer, slice);
     GRPC_CLOSURE_SCHED(s->on_next, GRPC_ERROR_NONE);
     s->on_next = nullptr;
     s->unprocessed_incoming_frames_decompressed = false;
   } else {
     grpc_slice_ref_internal(slice);
     grpc_slice_buffer_add(&s->frame_storage, slice);
   }

   if (is_last && s->received_last_frame) {
     grpc_chttp2_mark_stream_closed(t, s, true, false, GRPC_ERROR_NONE);
   }

   return GRPC_ERROR_NONE;
 }
	/*
	*
	* Copyright 2015 gRPC authors.
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*
	*/

	#include "src/core/ext/transport/chttp2/transport/frame_data.h"

	#include <string.h>

	#include <grpc/support/alloc.h>
	#include <grpc/support/log.h>
	#include <grpc/support/string_util.h>
	#include <grpc/support/useful.h>
	#include "src/core/ext/transport/chttp2/transport/internal.h"
	#include "src/core/lib/slice/slice_internal.h"
	#include "src/core/lib/slice/slice_string_helpers.h"
	#include "src/core/lib/support/string.h"
	#include "src/core/lib/transport/transport.h"

	grpc_error* grpc_chttp2_data_parser_init(grpc_chttp2_data_parser* parser) {
	parser->state = GRPC_CHTTP2_DATA_FH_0;
	parser->parsing_frame = nullptr;
	return GRPC_ERROR_NONE;
	}

	void grpc_chttp2_data_parser_destroy(grpc_chttp2_data_parser* parser) {
	if (parser->parsing_frame != nullptr) {
	GRPC_ERROR_UNREF(grpc_chttp2_incoming_byte_stream_finished(
	parser->parsing_frame,
	GRPC_ERROR_CREATE_FROM_STATIC_STRING("Parser destroyed"), false));
	}
	GRPC_ERROR_UNREF(parser->error);
	}

	grpc_error* grpc_chttp2_data_parser_begin_frame(grpc_chttp2_data_parser* parser,
	uint8_t flags,
	uint32_t stream_id,
	grpc_chttp2_stream* s) {
	if (flags & ~GRPC_CHTTP2_DATA_FLAG_END_STREAM) {
	char* msg;
	gpr_asprintf(&msg, "unsupported data flags: 0x%02x", flags);
	grpc_error* err =
	grpc_error_set_int(GRPC_ERROR_CREATE_FROM_COPIED_STRING(msg),
	GRPC_ERROR_INT_STREAM_ID, (intptr_t)stream_id);
	gpr_free(msg);
	return err;
	}

	if (flags & GRPC_CHTTP2_DATA_FLAG_END_STREAM) {
	s->received_last_frame = true;
	} else {
	s->received_last_frame = false;
	}

	return GRPC_ERROR_NONE;
	}

	void grpc_chttp2_encode_data(uint32_t id, grpc_slice_buffer* inbuf,
	uint32_t write_bytes, int is_eof,
	grpc_transport_one_way_stats* stats,
	grpc_slice_buffer* outbuf) {
	grpc_slice hdr;
	uint8_t* p;
	static const size_t header_size = 9;

	hdr = GRPC_SLICE_MALLOC(header_size);
	p = GRPC_SLICE_START_PTR(hdr);
	GPR_ASSERT(write_bytes < (1 << 24));
	*p++ = (uint8_t)(write_bytes >> 16);
	*p++ = (uint8_t)(write_bytes >> 8);
	*p++ = (uint8_t)(write_bytes);
	*p++ = GRPC_CHTTP2_FRAME_DATA;
	*p++ = is_eof ? GRPC_CHTTP2_DATA_FLAG_END_STREAM : 0;
	*p++ = (uint8_t)(id >> 24);
	*p++ = (uint8_t)(id >> 16);
	*p++ = (uint8_t)(id >> 8);
	*p++ = (uint8_t)(id);
	grpc_slice_buffer_add(outbuf, hdr);

	grpc_slice_buffer_move_first_no_ref(inbuf, write_bytes, outbuf);

	stats->framing_bytes += header_size;
	stats->data_bytes += write_bytes;
	}

	grpc_error* grpc_deframe_unprocessed_incoming_frames(
	grpc_chttp2_data_parser* p, grpc_chttp2_stream* s,
	grpc_slice_buffer* slices, grpc_slice* slice_out,
	grpc_byte_stream** stream_out) {
	grpc_error* error = GRPC_ERROR_NONE;
	grpc_chttp2_transport* t = s->t;

	while (slices->count > 0) {
	uint8_t* beg = nullptr;
	uint8_t* end = nullptr;
	uint8_t* cur = nullptr;

	grpc_slice slice = grpc_slice_buffer_take_first(slices);

	beg = GRPC_SLICE_START_PTR(slice);
	end = GRPC_SLICE_END_PTR(slice);
	cur = beg;
	uint32_t message_flags;
	char* msg;

	if (cur == end) {
	grpc_slice_unref_internal(slice);
	continue;
	}

	switch (p->state) {
	case GRPC_CHTTP2_DATA_ERROR:
	p->state = GRPC_CHTTP2_DATA_ERROR;
	grpc_slice_unref_internal(slice);
	return GRPC_ERROR_REF(p->error);
	case GRPC_CHTTP2_DATA_FH_0:
	s->stats.incoming.framing_bytes++;
	p->frame_type = *cur;
	switch (p->frame_type) {
	case 0:
	p->is_frame_compressed = false; /* GPR_FALSE */
	break;
	case 1:
	p->is_frame_compressed = true; /* GPR_TRUE */
	break;
	default:
	gpr_asprintf(&msg, "Bad GRPC frame type 0x%02x", p->frame_type);
	p->error = GRPC_ERROR_CREATE_FROM_COPIED_STRING(msg);
	p->error = grpc_error_set_int(p->error, GRPC_ERROR_INT_STREAM_ID,
	(intptr_t)s->id);
	gpr_free(msg);
	msg = grpc_dump_slice(slice, GPR_DUMP_HEX \| GPR_DUMP_ASCII);
	p->error = grpc_error_set_str(p->error, GRPC_ERROR_STR_RAW_BYTES,
	grpc_slice_from_copied_string(msg));
	gpr_free(msg);
	p->error =
	grpc_error_set_int(p->error, GRPC_ERROR_INT_OFFSET, cur - beg);
	p->state = GRPC_CHTTP2_DATA_ERROR;
	grpc_slice_unref_internal(slice);
	return GRPC_ERROR_REF(p->error);
	}
	if (++cur == end) {
	p->state = GRPC_CHTTP2_DATA_FH_1;
	grpc_slice_unref_internal(slice);
	continue;
	}
	/* fallthrough */
	case GRPC_CHTTP2_DATA_FH_1:
	s->stats.incoming.framing_bytes++;
	p->frame_size = ((uint32_t)*cur) << 24;
	if (++cur == end) {
	p->state = GRPC_CHTTP2_DATA_FH_2;
	grpc_slice_unref_internal(slice);
	continue;
	}
	/* fallthrough */
	case GRPC_CHTTP2_DATA_FH_2:
	s->stats.incoming.framing_bytes++;
	p->frame_size \|= ((uint32_t)*cur) << 16;
	if (++cur == end) {
	p->state = GRPC_CHTTP2_DATA_FH_3;
	grpc_slice_unref_internal(slice);
	continue;
	}
	/* fallthrough */
	case GRPC_CHTTP2_DATA_FH_3:
	s->stats.incoming.framing_bytes++;
	p->frame_size \|= ((uint32_t)*cur) << 8;
	if (++cur == end) {
	p->state = GRPC_CHTTP2_DATA_FH_4;
	grpc_slice_unref_internal(slice);
	continue;
	}
	/* fallthrough */
	case GRPC_CHTTP2_DATA_FH_4:
	s->stats.incoming.framing_bytes++;
	GPR_ASSERT(stream_out != nullptr);
	GPR_ASSERT(p->parsing_frame == nullptr);
	p->frame_size \|= ((uint32_t)*cur);
	p->state = GRPC_CHTTP2_DATA_FRAME;
	++cur;
	message_flags = 0;
	if (p->is_frame_compressed) {
	message_flags \|= GRPC_WRITE_INTERNAL_COMPRESS;
	}
	p->parsing_frame = grpc_chttp2_incoming_byte_stream_create(
	t, s, p->frame_size, message_flags);
	*stream_out = &p->parsing_frame->base;
	if (p->parsing_frame->remaining_bytes == 0) {
	GRPC_ERROR_UNREF(grpc_chttp2_incoming_byte_stream_finished(
	p->parsing_frame, GRPC_ERROR_NONE, true));
	p->parsing_frame = nullptr;
	p->state = GRPC_CHTTP2_DATA_FH_0;
	}
	s->pending_byte_stream = true;

	if (cur != end) {
	grpc_slice_buffer_undo_take_first(
	slices,
	grpc_slice_sub(slice, (size_t)(cur - beg), (size_t)(end - beg)));
	}
	grpc_slice_unref_internal(slice);
	return GRPC_ERROR_NONE;
	case GRPC_CHTTP2_DATA_FRAME: {
	GPR_ASSERT(p->parsing_frame != nullptr);
	GPR_ASSERT(slice_out != nullptr);
	if (cur == end) {
	grpc_slice_unref_internal(slice);
	continue;
	}
	uint32_t remaining = (uint32_t)(end - cur);
	if (remaining == p->frame_size) {
	s->stats.incoming.data_bytes += remaining;
	if (GRPC_ERROR_NONE != (error = grpc_chttp2_incoming_byte_stream_push(
	p->parsing_frame,
	grpc_slice_sub(slice, (size_t)(cur - beg),
	(size_t)(end - beg)),
	slice_out))) {
	grpc_slice_unref_internal(slice);
	return error;
	}
	if (GRPC_ERROR_NONE !=
	(error = grpc_chttp2_incoming_byte_stream_finished(
	p->parsing_frame, GRPC_ERROR_NONE, true))) {
	grpc_slice_unref_internal(slice);
	return error;
	}
	p->parsing_frame = nullptr;
	p->state = GRPC_CHTTP2_DATA_FH_0;
	grpc_slice_unref_internal(slice);
	return GRPC_ERROR_NONE;
	} else if (remaining < p->frame_size) {
	s->stats.incoming.data_bytes += remaining;
	if (GRPC_ERROR_NONE != (error = grpc_chttp2_incoming_byte_stream_push(
	p->parsing_frame,
	grpc_slice_sub(slice, (size_t)(cur - beg),
	(size_t)(end - beg)),
	slice_out))) {
	return error;
	}
	p->frame_size -= remaining;
	grpc_slice_unref_internal(slice);
	return GRPC_ERROR_NONE;
	} else {
	GPR_ASSERT(remaining > p->frame_size);
	s->stats.incoming.data_bytes += p->frame_size;
	if (GRPC_ERROR_NONE !=
	(grpc_chttp2_incoming_byte_stream_push(
	p->parsing_frame,
	grpc_slice_sub(slice, (size_t)(cur - beg),
	(size_t)(cur + p->frame_size - beg)),
	slice_out))) {
	grpc_slice_unref_internal(slice);
	return error;
	}
	if (GRPC_ERROR_NONE !=
	(error = grpc_chttp2_incoming_byte_stream_finished(
	p->parsing_frame, GRPC_ERROR_NONE, true))) {
	grpc_slice_unref_internal(slice);
	return error;
	}
	p->parsing_frame = nullptr;
	p->state = GRPC_CHTTP2_DATA_FH_0;
	cur += p->frame_size;
	grpc_slice_buffer_undo_take_first(
	slices,
	grpc_slice_sub(slice, (size_t)(cur - beg), (size_t)(end - beg)));
	grpc_slice_unref_internal(slice);
	return GRPC_ERROR_NONE;
	}
	}
	}
	}

	return GRPC_ERROR_NONE;
	}

	grpc_error* grpc_chttp2_data_parser_parse(void* parser,
	grpc_chttp2_transport* t,
	grpc_chttp2_stream* s,
	grpc_slice slice, int is_last) {
	if (!s->pending_byte_stream) {
	grpc_slice_ref_internal(slice);
	grpc_slice_buffer_add(&s->frame_storage, slice);
	grpc_chttp2_maybe_complete_recv_message(t, s);
	} else if (s->on_next) {
	GPR_ASSERT(s->frame_storage.length == 0);
	grpc_slice_ref_internal(slice);
	grpc_slice_buffer_add(&s->unprocessed_incoming_frames_buffer, slice);
	GRPC_CLOSURE_SCHED(s->on_next, GRPC_ERROR_NONE);
	s->on_next = nullptr;
	s->unprocessed_incoming_frames_decompressed = false;
	} else {
	grpc_slice_ref_internal(slice);
	grpc_slice_buffer_add(&s->frame_storage, slice);
	}

	if (is_last && s->received_last_frame) {
	grpc_chttp2_mark_stream_closed(t, s, true, false, GRPC_ERROR_NONE);
	}

	return GRPC_ERROR_NONE;
	}