grpc_error *grpc_chttp2_perform_read(grpc_exec_ctx *exec_ctx,
grpc_chttp2_transport *t,
grpc_slice slice) {
uint8_t *beg = GRPC_SLICE_START_PTR(slice);
uint8_t *end = GRPC_SLICE_END_PTR(slice);
uint8_t *cur = beg;
grpc_error *err;
if (cur == end) return GRPC_ERROR_NONE;
switch (t->deframe_state) {
case GRPC_DTS_CLIENT_PREFIX_0:
case GRPC_DTS_CLIENT_PREFIX_1:
case GRPC_DTS_CLIENT_PREFIX_2:
case GRPC_DTS_CLIENT_PREFIX_3:
case GRPC_DTS_CLIENT_PREFIX_4:
case GRPC_DTS_CLIENT_PREFIX_5:
case GRPC_DTS_CLIENT_PREFIX_6:
case GRPC_DTS_CLIENT_PREFIX_7:
case GRPC_DTS_CLIENT_PREFIX_8:
case GRPC_DTS_CLIENT_PREFIX_9:
case GRPC_DTS_CLIENT_PREFIX_10:
case GRPC_DTS_CLIENT_PREFIX_11:
case GRPC_DTS_CLIENT_PREFIX_12:
case GRPC_DTS_CLIENT_PREFIX_13:
case GRPC_DTS_CLIENT_PREFIX_14:
case GRPC_DTS_CLIENT_PREFIX_15:
case GRPC_DTS_CLIENT_PREFIX_16:
case GRPC_DTS_CLIENT_PREFIX_17:
case GRPC_DTS_CLIENT_PREFIX_18:
case GRPC_DTS_CLIENT_PREFIX_19:
case GRPC_DTS_CLIENT_PREFIX_20:
case GRPC_DTS_CLIENT_PREFIX_21:
case GRPC_DTS_CLIENT_PREFIX_22:
case GRPC_DTS_CLIENT_PREFIX_23:
while (cur != end && t->deframe_state != GRPC_DTS_FH_0) {
if (*cur != GRPC_CHTTP2_CLIENT_CONNECT_STRING[t->deframe_state]) {
char *msg;
gpr_asprintf(
&msg,
"Connect string mismatch: expected '%c' (%d) got '%c' (%d) "
"at byte %d",
GRPC_CHTTP2_CLIENT_CONNECT_STRING[t->deframe_state],
(int)(uint8_t)GRPC_CHTTP2_CLIENT_CONNECT_STRING[t->deframe_state],
*cur, (int)*cur, t->deframe_state);
err = GRPC_ERROR_CREATE_FROM_COPIED_STRING(msg);
gpr_free(msg);
return err;
}
++cur;
t->deframe_state =
(grpc_chttp2_deframe_transport_state)(1 + (int)t->deframe_state);
}
if (cur == end) {
return GRPC_ERROR_NONE;
}
/* fallthrough */
dts_fh_0:
case GRPC_DTS_FH_0:
GPR_ASSERT(cur < end);
t->incoming_frame_size = ((uint32_t)*cur) << 16;
if (++cur == end) {
t->deframe_state = GRPC_DTS_FH_1;
return GRPC_ERROR_NONE;
}
/* fallthrough */
case GRPC_DTS_FH_1:
GPR_ASSERT(cur < end);
t->incoming_frame_size |= ((uint32_t)*cur) << 8;
if (++cur == end) {
t->deframe_state = GRPC_DTS_FH_2;
return GRPC_ERROR_NONE;
}
/* fallthrough */
case GRPC_DTS_FH_2:
GPR_ASSERT(cur < end);
t->incoming_frame_size |= *cur;
if (++cur == end) {
t->deframe_state = GRPC_DTS_FH_3;
return GRPC_ERROR_NONE;
}
/* fallthrough */
case GRPC_DTS_FH_3:
GPR_ASSERT(cur < end);
t->incoming_frame_type = *cur;
if (++cur == end) {
t->deframe_state = GRPC_DTS_FH_4;
return GRPC_ERROR_NONE;
}
/* fallthrough */
case GRPC_DTS_FH_4:
GPR_ASSERT(cur < end);
t->incoming_frame_flags = *cur;
if (++cur == end) {
t->deframe_state = GRPC_DTS_FH_5;
return GRPC_ERROR_NONE;
}
/* fallthrough */
case GRPC_DTS_FH_5:
GPR_ASSERT(cur < end);
t->incoming_stream_id = (((uint32_t)*cur) & 0x7f) << 24;
if (++cur == end) {
t->deframe_state = GRPC_DTS_FH_6;
return GRPC_ERROR_NONE;
}
/* fallthrough */
case GRPC_DTS_FH_6:
GPR_ASSERT(cur < end);
t->incoming_stream_id |= ((uint32_t)*cur) << 16;
if (++cur == end) {
t->deframe_state = GRPC_DTS_FH_7;
return GRPC_ERROR_NONE;
}
/* fallthrough */
case GRPC_DTS_FH_7:
GPR_ASSERT(cur < end);
t->incoming_stream_id |= ((uint32_t)*cur) << 8;
if (++cur == end) {
t->deframe_state = GRPC_DTS_FH_8;
return GRPC_ERROR_NONE;
}
/* fallthrough */
case GRPC_DTS_FH_8:
GPR_ASSERT(cur < end);
t->incoming_stream_id |= ((uint32_t)*cur);
t->deframe_state = GRPC_DTS_FRAME;
err = init_frame_parser(exec_ctx, t);
if (err != GRPC_ERROR_NONE) {
return err;
}
if (t->incoming_frame_size == 0) {
err = parse_frame_slice(exec_ctx, t, grpc_empty_slice(), 1);
if (err != GRPC_ERROR_NONE) {
return err;
}
t->incoming_stream = NULL;
if (++cur == end) {
t->deframe_state = GRPC_DTS_FH_0;
return GRPC_ERROR_NONE;
}
goto dts_fh_0; /* loop */
} else if (t->incoming_frame_size >
t->settings[GRPC_ACKED_SETTINGS]
[GRPC_CHTTP2_SETTINGS_MAX_FRAME_SIZE]) {
char *msg;
gpr_asprintf(&msg, "Frame size %d is larger than max frame size %d",
t->incoming_frame_size,
t->settings[GRPC_ACKED_SETTINGS]
[GRPC_CHTTP2_SETTINGS_MAX_FRAME_SIZE]);
err = GRPC_ERROR_CREATE_FROM_COPIED_STRING(msg);
gpr_free(msg);
return err;
}
if (++cur == end) {
return GRPC_ERROR_NONE;
}
/* fallthrough */
case GRPC_DTS_FRAME:
GPR_ASSERT(cur < end);
if ((uint32_t)(end - cur) == t->incoming_frame_size) {
err = parse_frame_slice(
exec_ctx, t, grpc_slice_sub_no_ref(slice, (size_t)(cur - beg),
(size_t)(end - beg)),
1);
if (err != GRPC_ERROR_NONE) {
return err;
}
t->deframe_state = GRPC_DTS_FH_0;
t->incoming_stream = NULL;
return GRPC_ERROR_NONE;
} else if ((uint32_t)(end - cur) > t->incoming_frame_size) {
size_t cur_offset = (size_t)(cur - beg);
err = parse_frame_slice(
exec_ctx, t,
grpc_slice_sub_no_ref(slice, cur_offset,
cur_offset + t->incoming_frame_size),
1);
if (err != GRPC_ERROR_NONE) {
return err;
}
cur += t->incoming_frame_size;
t->incoming_stream = NULL;
goto dts_fh_0; /* loop */
} else {
err = parse_frame_slice(
exec_ctx, t, grpc_slice_sub_no_ref(slice, (size_t)(cur - beg),
(size_t)(end - beg)),
0);
if (err != GRPC_ERROR_NONE) {
return err;
}
t->incoming_frame_size -= (uint32_t)(end - cur);
return GRPC_ERROR_NONE;
}
GPR_UNREACHABLE_CODE(return 0);
}
GPR_UNREACHABLE_CODE(return 0);
}
int grpc_chttp2_perform_read(grpc_chttp2_transport_parsing *transport_parsing,
gpr_slice slice) {
gpr_uint8 *beg = GPR_SLICE_START_PTR(slice);
gpr_uint8 *end = GPR_SLICE_END_PTR(slice);
gpr_uint8 *cur = beg;
if (cur == end) return 1;
switch (transport_parsing->deframe_state) {
case GRPC_DTS_CLIENT_PREFIX_0:
case GRPC_DTS_CLIENT_PREFIX_1:
case GRPC_DTS_CLIENT_PREFIX_2:
case GRPC_DTS_CLIENT_PREFIX_3:
case GRPC_DTS_CLIENT_PREFIX_4:
case GRPC_DTS_CLIENT_PREFIX_5:
case GRPC_DTS_CLIENT_PREFIX_6:
case GRPC_DTS_CLIENT_PREFIX_7:
case GRPC_DTS_CLIENT_PREFIX_8:
case GRPC_DTS_CLIENT_PREFIX_9:
case GRPC_DTS_CLIENT_PREFIX_10:
case GRPC_DTS_CLIENT_PREFIX_11:
case GRPC_DTS_CLIENT_PREFIX_12:
case GRPC_DTS_CLIENT_PREFIX_13:
case GRPC_DTS_CLIENT_PREFIX_14:
case GRPC_DTS_CLIENT_PREFIX_15:
case GRPC_DTS_CLIENT_PREFIX_16:
case GRPC_DTS_CLIENT_PREFIX_17:
case GRPC_DTS_CLIENT_PREFIX_18:
case GRPC_DTS_CLIENT_PREFIX_19:
case GRPC_DTS_CLIENT_PREFIX_20:
case GRPC_DTS_CLIENT_PREFIX_21:
case GRPC_DTS_CLIENT_PREFIX_22:
case GRPC_DTS_CLIENT_PREFIX_23:
while (cur != end && transport_parsing->deframe_state != GRPC_DTS_FH_0) {
if (*cur != GRPC_CHTTP2_CLIENT_CONNECT_STRING[transport_parsing
->deframe_state]) {
gpr_log(GPR_INFO,
"Connect string mismatch: expected '%c' (%d) got '%c' (%d) "
"at byte %d",
GRPC_CHTTP2_CLIENT_CONNECT_STRING[transport_parsing
->deframe_state],
(int)(gpr_uint8)GRPC_CHTTP2_CLIENT_CONNECT_STRING
[transport_parsing->deframe_state],
*cur, (int)*cur, transport_parsing->deframe_state);
return 0;
}
++cur;
++transport_parsing->deframe_state;
}
if (cur == end) {
return 1;
}
/* fallthrough */
dts_fh_0:
case GRPC_DTS_FH_0:
GPR_ASSERT(cur < end);
transport_parsing->incoming_frame_size = ((gpr_uint32)*cur) << 16;
if (++cur == end) {
transport_parsing->deframe_state = GRPC_DTS_FH_1;
return 1;
}
/* fallthrough */
case GRPC_DTS_FH_1:
GPR_ASSERT(cur < end);
transport_parsing->incoming_frame_size |= ((gpr_uint32)*cur) << 8;
if (++cur == end) {
transport_parsing->deframe_state = GRPC_DTS_FH_2;
return 1;
}
/* fallthrough */
case GRPC_DTS_FH_2:
GPR_ASSERT(cur < end);
transport_parsing->incoming_frame_size |= *cur;
if (++cur == end) {
transport_parsing->deframe_state = GRPC_DTS_FH_3;
return 1;
}
/* fallthrough */
case GRPC_DTS_FH_3:
GPR_ASSERT(cur < end);
transport_parsing->incoming_frame_type = *cur;
if (++cur == end) {
transport_parsing->deframe_state = GRPC_DTS_FH_4;
return 1;
}
/* fallthrough */
case GRPC_DTS_FH_4:
GPR_ASSERT(cur < end);
transport_parsing->incoming_frame_flags = *cur;
if (++cur == end) {
transport_parsing->deframe_state = GRPC_DTS_FH_5;
return 1;
}
/* fallthrough */
case GRPC_DTS_FH_5:
GPR_ASSERT(cur < end);
transport_parsing->incoming_stream_id = (((gpr_uint32)*cur) & 0x7f) << 24;
if (++cur == end) {
transport_parsing->deframe_state = GRPC_DTS_FH_6;
return 1;
}
/* fallthrough */
case GRPC_DTS_FH_6:
GPR_ASSERT(cur < end);
transport_parsing->incoming_stream_id |= ((gpr_uint32)*cur) << 16;
if (++cur == end) {
transport_parsing->deframe_state = GRPC_DTS_FH_7;
return 1;
}
/* fallthrough */
case GRPC_DTS_FH_7:
GPR_ASSERT(cur < end);
transport_parsing->incoming_stream_id |= ((gpr_uint32)*cur) << 8;
if (++cur == end) {
transport_parsing->deframe_state = GRPC_DTS_FH_8;
return 1;
}
/* fallthrough */
case GRPC_DTS_FH_8:
GPR_ASSERT(cur < end);
transport_parsing->incoming_stream_id |= ((gpr_uint32)*cur);
transport_parsing->deframe_state = GRPC_DTS_FRAME;
if (!init_frame_parser(transport_parsing)) {
return 0;
}
if (transport_parsing->incoming_stream_id) {
transport_parsing->last_incoming_stream_id =
transport_parsing->incoming_stream_id;
}
if (transport_parsing->incoming_frame_size == 0) {
if (!parse_frame_slice(transport_parsing, gpr_empty_slice(), 1)) {
return 0;
}
transport_parsing->incoming_stream = NULL;
if (++cur == end) {
transport_parsing->deframe_state = GRPC_DTS_FH_0;
return 1;
}
goto dts_fh_0; /* loop */
}
if (++cur == end) {
return 1;
}
/* fallthrough */
case GRPC_DTS_FRAME:
GPR_ASSERT(cur < end);
if ((gpr_uint32)(end - cur) == transport_parsing->incoming_frame_size) {
if (!parse_frame_slice(
transport_parsing,
gpr_slice_sub_no_ref(slice, cur - beg, end - beg), 1)) {
return 0;
}
transport_parsing->deframe_state = GRPC_DTS_FH_0;
transport_parsing->incoming_stream = NULL;
return 1;
} else if ((gpr_uint32)(end - cur) >
transport_parsing->incoming_frame_size) {
if (!parse_frame_slice(
transport_parsing,
gpr_slice_sub_no_ref(
slice, cur - beg,
cur + transport_parsing->incoming_frame_size - beg),
1)) {
return 0;
}
cur += transport_parsing->incoming_frame_size;
transport_parsing->incoming_stream = NULL;
goto dts_fh_0; /* loop */
} else {
if (!parse_frame_slice(
transport_parsing,
gpr_slice_sub_no_ref(slice, cur - beg, end - beg), 0)) {
return 0;
}
transport_parsing->incoming_frame_size -= (end - cur);
return 1;
}
gpr_log(GPR_ERROR, "should never reach here");
abort();
}
gpr_log(GPR_ERROR, "should never reach here");
abort();
return 0;
}
