diff options
Diffstat (limited to 'src/core/transport/chttp2/frame_data.c')
| -rw-r--r-- | src/core/transport/chttp2/frame_data.c | 164 |
1 files changed, 164 insertions, 0 deletions
diff --git a/src/core/transport/chttp2/frame_data.c b/src/core/transport/chttp2/frame_data.c new file mode 100644 index 0000000000..fbd3b6cabf --- /dev/null +++ b/src/core/transport/chttp2/frame_data.c @@ -0,0 +1,164 @@ +/* + * + * 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_data.h" + +#include <string.h> + +#include <grpc/support/alloc.h> +#include <grpc/support/log.h> +#include <grpc/support/string.h> +#include <grpc/support/useful.h> +#include "src/core/transport/transport.h" + +grpc_chttp2_parse_error grpc_chttp2_data_parser_init( + grpc_chttp2_data_parser *parser) { + parser->state = GRPC_CHTTP2_DATA_FH_0; + grpc_sopb_init(&parser->incoming_sopb); + return GRPC_CHTTP2_PARSE_OK; +} + +void grpc_chttp2_data_parser_destroy(grpc_chttp2_data_parser *parser) { + grpc_sopb_destroy(&parser->incoming_sopb); +} + +grpc_chttp2_parse_error grpc_chttp2_data_parser_begin_frame( + grpc_chttp2_data_parser *parser, gpr_uint8 flags) { + if (flags & ~GRPC_CHTTP2_DATA_FLAG_END_STREAM) { + gpr_log(GPR_ERROR, "unsupported data flags: 0x%02x", flags); + return GRPC_CHTTP2_STREAM_ERROR; + } + + if (flags & GRPC_CHTTP2_DATA_FLAG_END_STREAM) { + parser->is_last_frame = 1; + } else { + parser->is_last_frame = 0; + } + + return GRPC_CHTTP2_PARSE_OK; +} + +grpc_chttp2_parse_error grpc_chttp2_data_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_data_parser *p = parser; + + if (is_last && p->is_last_frame) { + state->end_of_stream = 1; + state->need_flush_reads = 1; + } + + if (cur == end) { + return GRPC_CHTTP2_PARSE_OK; + } + + switch (p->state) { + fh_0: + case GRPC_CHTTP2_DATA_FH_0: + p->frame_type = *cur; + if (++cur == end) { + p->state = GRPC_CHTTP2_DATA_FH_1; + return GRPC_CHTTP2_PARSE_OK; + } + switch (p->frame_type) { + case 0: + break; + case 1: + gpr_log(GPR_ERROR, "Compressed GRPC frames not yet supported"); + return GRPC_CHTTP2_STREAM_ERROR; + default: + gpr_log(GPR_ERROR, "Bad GRPC frame type 0x%02x", p->frame_type); + return GRPC_CHTTP2_STREAM_ERROR; + } + /* fallthrough */ + case GRPC_CHTTP2_DATA_FH_1: + p->frame_size = ((gpr_uint32)*cur) << 24; + if (++cur == end) { + p->state = GRPC_CHTTP2_DATA_FH_2; + return GRPC_CHTTP2_PARSE_OK; + } + /* fallthrough */ + case GRPC_CHTTP2_DATA_FH_2: + p->frame_size |= ((gpr_uint32)*cur) << 16; + if (++cur == end) { + p->state = GRPC_CHTTP2_DATA_FH_3; + return GRPC_CHTTP2_PARSE_OK; + } + /* fallthrough */ + case GRPC_CHTTP2_DATA_FH_3: + p->frame_size |= ((gpr_uint32)*cur) << 8; + if (++cur == end) { + p->state = GRPC_CHTTP2_DATA_FH_4; + return GRPC_CHTTP2_PARSE_OK; + } + /* fallthrough */ + case GRPC_CHTTP2_DATA_FH_4: + p->frame_size |= ((gpr_uint32)*cur); + p->state = GRPC_CHTTP2_DATA_FRAME; + ++cur; + state->need_flush_reads = 1; + grpc_sopb_add_begin_message(&p->incoming_sopb, p->frame_size, 0); + /* fallthrough */ + case GRPC_CHTTP2_DATA_FRAME: + if (cur == end) { + return GRPC_CHTTP2_PARSE_OK; + } else if (end - cur == p->frame_size) { + state->need_flush_reads = 1; + grpc_sopb_add_slice(&p->incoming_sopb, + gpr_slice_sub(slice, cur - beg, end - beg)); + p->state = GRPC_CHTTP2_DATA_FH_0; + return GRPC_CHTTP2_PARSE_OK; + } else if (end - cur > p->frame_size) { + state->need_flush_reads = 1; + grpc_sopb_add_slice( + &p->incoming_sopb, + gpr_slice_sub(slice, cur - beg, cur + p->frame_size - beg)); + cur += p->frame_size; + goto fh_0; /* loop */ + } else { + state->need_flush_reads = 1; + grpc_sopb_add_slice(&p->incoming_sopb, + gpr_slice_sub(slice, cur - beg, end - beg)); + p->frame_size -= (end - cur); + return GRPC_CHTTP2_PARSE_OK; + } + } + + gpr_log(GPR_ERROR, "should never reach here"); + abort(); + return GRPC_CHTTP2_CONNECTION_ERROR; +} + |