| /* |
| * |
| * Copyright 2015, 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/transport/chttp2/frame_window_update.h" |
| |
| #include <grpc/support/log.h> |
| |
| gpr_slice grpc_chttp2_window_update_create(gpr_uint32 id, |
| gpr_uint32 window_update) { |
| gpr_slice slice = gpr_slice_malloc(13); |
| gpr_uint8 *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++ = id >> 24; |
| *p++ = id >> 16; |
| *p++ = id >> 8; |
| *p++ = id; |
| *p++ = window_update >> 24; |
| *p++ = window_update >> 16; |
| *p++ = window_update >> 8; |
| *p++ = window_update; |
| |
| return slice; |
| } |
| |
| grpc_chttp2_parse_error grpc_chttp2_window_update_parser_begin_frame( |
| grpc_chttp2_window_update_parser *parser, gpr_uint32 length, |
| gpr_uint8 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( |
| void *parser, grpc_chttp2_parse_state *state, gpr_slice slice, |
| int is_last) { |
| gpr_uint8 *const beg = GPR_SLICE_START_PTR(slice); |
| gpr_uint8 *const end = GPR_SLICE_END_PTR(slice); |
| gpr_uint8 *cur = beg; |
| grpc_chttp2_window_update_parser *p = parser; |
| |
| while (p->byte != 4 && cur != end) { |
| p->amount |= ((gpr_uint32) * cur) << (8 * (3 - p->byte)); |
| cur++; |
| p->byte++; |
| } |
| |
| if (p->byte == 4) { |
| if (p->amount == 0 || (p->amount & 0x80000000u)) { |
| gpr_log(GPR_ERROR, "invalid window update bytes: %d", p->amount); |
| return GRPC_CHTTP2_CONNECTION_ERROR; |
| } |
| GPR_ASSERT(is_last); |
| state->window_update = p->amount; |
| } |
| |
| return GRPC_CHTTP2_PARSE_OK; |
| } |