static int prepare_application_metadata(grpc_call *call, size_t count,
grpc_metadata *metadata) {
size_t i;
for (i = 0; i < count; i++) {
grpc_metadata *md = &metadata[i];
grpc_metadata *next_md = (i == count - 1) ? NULL : &metadata[i + 1];
grpc_metadata *prev_md = (i == 0) ? NULL : &metadata[i - 1];
grpc_linked_mdelem *l = (grpc_linked_mdelem *)&md->internal_data;
GPR_ASSERT(sizeof(grpc_linked_mdelem) == sizeof(md->internal_data));
l->md = grpc_mdelem_from_string_and_buffer(call->metadata_context, md->key,
(const gpr_uint8 *)md->value,
md->value_length);
if (!grpc_mdstr_is_legal_header(l->md->key)) {
gpr_log(GPR_ERROR, "attempt to send invalid metadata key");
return 0;
} else if (!grpc_mdstr_is_bin_suffixed(l->md->key) &&
!grpc_mdstr_is_legal_header(l->md->value)) {
gpr_log(GPR_ERROR, "attempt to send invalid metadata value");
return 0;
}
l->next = next_md ? (grpc_linked_mdelem *)&next_md->internal_data : NULL;
l->prev = prev_md ? (grpc_linked_mdelem *)&prev_md->internal_data : NULL;
}
return 1;
}
static int prepare_application_metadata(grpc_call *call, int count,
grpc_metadata *metadata,
int is_trailing,
int prepend_extra_metadata) {
int i;
grpc_metadata_batch *batch =
&call->metadata_batch[0 /* is_receiving */][is_trailing];
if (prepend_extra_metadata) {
if (call->send_extra_metadata_count == 0) {
prepend_extra_metadata = 0;
} else {
for (i = 0; i < call->send_extra_metadata_count; i++) {
GRPC_MDELEM_REF(call->send_extra_metadata[i].md);
}
for (i = 1; i < call->send_extra_metadata_count; i++) {
call->send_extra_metadata[i].prev = &call->send_extra_metadata[i - 1];
}
for (i = 0; i < call->send_extra_metadata_count - 1; i++) {
call->send_extra_metadata[i].next = &call->send_extra_metadata[i + 1];
}
}
}
for (i = 0; i < count; i++) {
grpc_metadata *md = &metadata[i];
grpc_linked_mdelem *l = (grpc_linked_mdelem *)&md->internal_data;
GPR_ASSERT(sizeof(grpc_linked_mdelem) == sizeof(md->internal_data));
l->md = grpc_mdelem_from_string_and_buffer(call->metadata_context, md->key,
(const gpr_uint8 *)md->value,
md->value_length);
if (!grpc_mdstr_is_legal_header(l->md->key)) {
gpr_log(GPR_ERROR, "attempt to send invalid metadata key: %s",
grpc_mdstr_as_c_string(l->md->key));
return 0;
} else if (!grpc_mdstr_is_bin_suffixed(l->md->key) &&
!grpc_mdstr_is_legal_nonbin_header(l->md->value)) {
gpr_log(GPR_ERROR, "attempt to send invalid metadata value");
return 0;
}
}
for (i = 1; i < count; i++) {
linked_from_md(&metadata[i])->prev = linked_from_md(&metadata[i - 1]);
}
for (i = 0; i < count - 1; i++) {
linked_from_md(&metadata[i])->next = linked_from_md(&metadata[i + 1]);
}
switch (prepend_extra_metadata * 2 + (count != 0)) {
case 0:
/* no prepend, no metadata => nothing to do */
batch->list.head = batch->list.tail = NULL;
break;
case 1:
/* metadata, but no prepend */
batch->list.head = linked_from_md(&metadata[0]);
batch->list.tail = linked_from_md(&metadata[count - 1]);
batch->list.head->prev = NULL;
batch->list.tail->next = NULL;
break;
case 2:
/* prepend, but no md */
batch->list.head = &call->send_extra_metadata[0];
batch->list.tail =
&call->send_extra_metadata[call->send_extra_metadata_count - 1];
batch->list.head->prev = NULL;
batch->list.tail->next = NULL;
break;
case 3:
/* prepend AND md */
batch->list.head = &call->send_extra_metadata[0];
call->send_extra_metadata[call->send_extra_metadata_count - 1].next =
linked_from_md(&metadata[0]);
linked_from_md(&metadata[0])->prev =
&call->send_extra_metadata[call->send_extra_metadata_count - 1];
batch->list.tail = linked_from_md(&metadata[count - 1]);
batch->list.head->prev = NULL;
batch->list.tail->next = NULL;
break;
default:
GPR_UNREACHABLE_CODE(return 0);
}
return 1;
}
