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/*
*
* Copyright 2015-2016, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#include "src/core/ext/transport/chttp2/transport/frame_window_update.h"
#include "src/core/ext/transport/chttp2/transport/internal.h"
#include <grpc/support/log.h>
gpr_slice grpc_chttp2_window_update_create(uint32_t id,
uint32_t window_update) {
gpr_slice slice = gpr_slice_malloc(13);
uint8_t *p = GPR_SLICE_START_PTR(slice);
GPR_ASSERT(window_update);
*p++ = 0;
*p++ = 0;
*p++ = 4;
*p++ = GRPC_CHTTP2_FRAME_WINDOW_UPDATE;
*p++ = 0;
*p++ = (uint8_t)(id >> 24);
*p++ = (uint8_t)(id >> 16);
*p++ = (uint8_t)(id >> 8);
*p++ = (uint8_t)(id);
*p++ = (uint8_t)(window_update >> 24);
*p++ = (uint8_t)(window_update >> 16);
*p++ = (uint8_t)(window_update >> 8);
*p++ = (uint8_t)(window_update);
return slice;
}
grpc_chttp2_parse_error grpc_chttp2_window_update_parser_begin_frame(
grpc_chttp2_window_update_parser *parser, uint32_t length, uint8_t flags) {
if (flags || length != 4) {
gpr_log(GPR_ERROR, "invalid window update: length=%d, flags=%02x", length,
flags);
return GRPC_CHTTP2_CONNECTION_ERROR;
}
parser->byte = 0;
parser->amount = 0;
return GRPC_CHTTP2_PARSE_OK;
}
grpc_chttp2_parse_error grpc_chttp2_window_update_parser_parse(
grpc_exec_ctx *exec_ctx, void *parser,
grpc_chttp2_transport_parsing *transport_parsing,
grpc_chttp2_stream_parsing *stream_parsing, gpr_slice slice, int is_last) {
uint8_t *const beg = GPR_SLICE_START_PTR(slice);
uint8_t *const end = GPR_SLICE_END_PTR(slice);
uint8_t *cur = beg;
grpc_chttp2_window_update_parser *p = parser;
while (p->byte != 4 && cur != end) {
p->amount |= ((uint32_t)*cur) << (8 * (3 - p->byte));
cur++;
p->byte++;
}
if (p->byte == 4) {
uint32_t received_update = p->amount;
if (received_update == 0 || (received_update & 0x80000000u)) {
gpr_log(GPR_ERROR, "invalid window update bytes: %d", p->amount);
return GRPC_CHTTP2_CONNECTION_ERROR;
}
GPR_ASSERT(is_last);
if (transport_parsing->incoming_stream_id != 0) {
if (stream_parsing != NULL) {
GRPC_CHTTP2_FLOW_CREDIT_STREAM("parse", transport_parsing,
stream_parsing, outgoing_window,
received_update);
grpc_chttp2_list_add_parsing_seen_stream(transport_parsing,
stream_parsing);
}
} else {
GRPC_CHTTP2_FLOW_CREDIT_TRANSPORT("parse", transport_parsing,
outgoing_window, received_update);
}
}
return GRPC_CHTTP2_PARSE_OK;
}
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