diff options
Diffstat (limited to 'src/core/transport/chttp2/frame_window_update.c')
-rw-r--r-- | src/core/transport/chttp2/frame_window_update.c | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/src/core/transport/chttp2/frame_window_update.c b/src/core/transport/chttp2/frame_window_update.c new file mode 100644 index 0000000000..f61714f52b --- /dev/null +++ b/src/core/transport/chttp2/frame_window_update.c @@ -0,0 +1,99 @@ +/* + * + * 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; +} |