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/*
*
* Copyright 2014, 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;
}
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