static unsigned char * handle_get_quad_freq (fs_backend *be, fs_segment segment,
unsigned int length,
unsigned char *content)
{
if (segment > be->segments) {
fs_error(LOG_ERR, "invalid segment number: %d", segment);
return fsp_error_new(segment, "invalid segment number");
}
if (length != 8) {
fs_error(LOG_ERR, "get_quad_freq(%d) wrong length %u", segment, length);
return fsp_error_new(segment, "wrong length");
}
int index, count;
memcpy(&index, content, sizeof(int));
memcpy(&count, content + sizeof(int), sizeof(int));
const char *filename;
/* this branch has no frequency data */
filename = "";
int fd = open(filename, FS_O_NOATIME | O_RDONLY, 0);
unsigned char *reply = message_new(FS_QUAD_FREQ, segment, count * sizeof(fs_quad_freq));
//ssize_t bytes = read(fd, reply + FS_HEADER, count * sizeof(fs_quad_freq));
ssize_t bytes = 0;
unsigned int *l = (unsigned int *) (reply + 4);
*l = bytes;
close(fd);
return reply;
}
static unsigned char * handle_commit_quad (fs_backend *be, fs_segment segment,
unsigned int length,
unsigned char *content)
{
if (segment > be->segments) {
fs_error(LOG_ERR, "invalid segment number: %d", segment);
return fsp_error_new(segment, "invalid segment number");
}
if (length != sizeof(int)) {
fs_error(LOG_ERR, "commit_quad(%d) missing flags", segment);
return fsp_error_new(segment, "missing flags");
}
int flags;
memcpy(&flags, content, sizeof (flags));
int ret = fs_quad_import_commit(be, segment, flags, 1);
if (ret) {
fs_error(LOG_ERR, "commit_quad(%d) failed", segment);
return fsp_error_new(segment, "quad commit failed");
}
return message_new(FS_DONE_OK, segment, 0);
}
static unsigned char * handle_new_models (fs_backend *be, fs_segment segment,
unsigned int length,
unsigned char *content)
{
if (segment > be->segments) {
fs_error(LOG_ERR, "invalid segment number: %d", segment);
return fsp_error_new(segment, "invalid segment number");
}
if (length < sizeof(fs_rid)) {
fs_error(LOG_ERR, "new_models(%d) missing model RIDs", segment);
return fsp_error_new(segment, "missing model RIDs");
}
fs_rid *models = (fs_rid *) content;
int invalid_count = 0;
for (int k= 0; k < (length / sizeof(fs_rid)); ++k) {
if (FS_IS_URI(models[k])) {
fs_backend_model_set_usage(be, segment, models[k], 0);
} else {
invalid_count++;
}
}
fs_mhash_flush(be->models);
if (invalid_count > 0) {
return fsp_error_new(segment, "one or more model RIDs is not a URI");
}
return message_new(FS_DONE_OK, segment, 0);
}
static unsigned char * handle_insert_quad (fs_backend *be, fs_segment segment,
unsigned int length,
unsigned char *content)
{
if (segment > be->segments) {
fs_error(LOG_ERR, "invalid segment number: %d", segment);
return fsp_error_new(segment, "invalid segment number");
}
if (length < 40) {
fs_error(LOG_ERR, "insert_quad(%d) too short", segment);
return fsp_error_new(segment, "too short");
}
int flags;
int count = (length - 8) / 32;
fs_rid (*buffer)[4] = (fs_rid (*)[4]) (content + 8);
memcpy(&flags, content, sizeof (flags));
int ret = fs_quad_import(be, segment, flags, count, buffer);
if (ret) {
fs_error(LOG_ERR, "insert_quad(%d) failed", segment);
return fsp_error_new(segment, "quad insert failed");
}
return NULL; /* no reply - semi-async */
}
static unsigned char * handle_get_data_size (fs_backend *be, fs_segment segment,
unsigned int length,
unsigned char *content)
{
if (segment > be->segments) {
fs_error(LOG_ERR, "invalid segment number: %d", segment);
return fsp_error_new(segment, "invalid segment number");
}
if (length > 0) {
fs_error(LOG_ERR, "get_data_size(%d) extraneous content", segment);
return fsp_error_new(segment, "extraneous content");
}
fs_data_size size = fs_get_data_size(be, segment);
fs_old_data_size old_size;
old_size.quads_s = size.quads_s;
old_size.quads_o = size.quads_o;
old_size.resources = size.resources;
old_size.models_s = size.models_s;
old_size.models_o = size.models_o;
unsigned char *reply = message_new(FS_SIZE, segment, sizeof(old_size));
memcpy(reply + FS_HEADER, &old_size, sizeof(old_size));
return reply;
}
static unsigned char * handle_resolve_attr (fs_backend *be, fs_segment segment,
unsigned int length,
unsigned char *content)
{
unsigned int count = length / sizeof(fs_rid);
if (segment > be->segments) {
fs_error(LOG_ERR, "invalid segment number: %d", segment);
return fsp_error_new(segment, "invalid segment number");
}
if (length < sizeof(fs_rid)) {
fs_error(LOG_ERR, "resolve_attr(%d) too short", segment);
return fsp_error_new(segment, "too short");
}
unsigned char *reply;
fs_rid_vector v;
fs_resource resources[count];
v.size = v.length = count;
v.data = (fs_rid *) content;
fs_resolve(be, segment, &v, resources);
unsigned int k, serial_length = 0;
for (k = 0; k < count; ++k) {
if (resources[k].lex) {
serial_length+= ((28 + strlen(resources[k].lex)) / 8);
} else {
serial_length+= 3;
}
}
reply = message_new(FS_RESOURCE_ATTR_LIST, segment, 8 * serial_length);
unsigned char *record = reply + FS_HEADER;
for (k = 0; k < count; ++k) {
unsigned int one_length;
if (resources[k].lex) {
one_length = ((28 + strlen(resources[k].lex)) / 8) * 8;
} else {
one_length = 24;
}
memcpy(record, &(resources[k].rid), sizeof (fs_rid));
memcpy(record + 8, &(resources[k].attr), sizeof (fs_rid));
memcpy(record + 16, &one_length, sizeof(one_length));
/* ASCII NUL is used to terminate strings on the wire */
if (resources[k].lex) {
strcpy((char *) record + 20, resources[k].lex);
} else {
*(record + 20) = '\0';
}
record += one_length;
}
return reply;
}
static unsigned char * handle_bind_next (fs_backend *be, fs_segment segment,
unsigned int length,
unsigned char *content)
{
unsigned char *reply;
if (segment > be->segments) {
fs_error(LOG_ERR, "invalid segment number: %d", segment);
return fsp_error_new(segment, "invalid segment number");
}
if (length != 8) {
fs_error(LOG_ERR, "bind_next(%d) wrong length %u", segment, length);
return fsp_error_new(segment, "wrong length");
}
unsigned int flags;
int count;
memcpy(&flags, content, sizeof (flags));
memcpy(&count, content + 4, sizeof (count));
fs_rid_vector **bindings;
bindings = fs_bind_next(be, segment, flags, count);
int k, cols = 0;
for (k = 0; k < 4; ++k) {
if (flags & 1 << k) cols++;
}
if (bindings == NULL) {
/* NULL => no match */
reply = message_new(FS_NO_MATCH, segment, 0);
cols = 0;
} else if (cols == 0) {
/* Zero columns => match with no binding */
reply = message_new(FS_BIND_LIST, segment, 0);
} else {
/* otherwise return bindings */
reply = message_new(FS_BIND_LIST, segment, bindings[0]->length * 8 * cols);
unsigned char *data = reply + FS_HEADER;
for (k= 0; k < cols; ++k) {
memcpy(data, bindings[k]->data, bindings[k]->length * 8);
data += bindings[k]->length * 8;
}
}
for (k = 0; k < cols; ++k) {
fs_rid_vector_free(bindings[k]);
}
free(bindings);
return reply;
}
static unsigned char * handle_price (fs_backend *be, fs_segment segment,
unsigned int length,
unsigned char *content)
{
if (segment > be->segments) {
fs_error(LOG_ERR, "invalid segment number: %d", segment);
return fsp_error_new(segment, "invalid segment number");
}
if (length < 24) {
fs_error(LOG_ERR, "price(%d) much too short", segment);
return fsp_error_new(segment, "much too short");
}
unsigned char *reply;
unsigned long long int rows = 0;
fs_rid_vector models, subjects, predicates, objects;
unsigned int flags, value;
memcpy(&flags, content, sizeof (flags));
memcpy(&value, content + 4, sizeof (models.length));
models.size = models.length = value / 8;
memcpy(&value, content + 8, sizeof (subjects.length));
subjects.size = subjects.length = value / 8;
memcpy(&value, content + 12, sizeof (predicates.length));
predicates.size = predicates.length = value / 8;
memcpy(&value, content + 16, sizeof (objects.length));
objects.size = objects.length = value / 8;
content += 24;
if (length < (models.size + subjects.size + predicates.size + objects.size) * 8 + 24) {
fs_error(LOG_ERR, "price(%d) too short", segment);
return fsp_error_new(segment, "too short");
}
models.data = (fs_rid *) content;
content += models.length * 8;
subjects.data = (fs_rid *) content;
content += subjects.length * 8;
predicates.data = (fs_rid *) content;
content += predicates.length * 8;
objects.data = (fs_rid *) content;
rows = fs_bind_price(be, segment, flags, &models, &subjects, &predicates, &objects);
reply = message_new(FS_ESTIMATED_ROWS, segment, 8);
memcpy(reply + FS_HEADER, &rows, sizeof(rows));
return reply;
}
static unsigned char * handle_lock (fs_backend *be,
fs_segment segment,
unsigned int length,
unsigned char *content)
{
return fsp_error_new(segment, "radix backend does not support/require locking");
}
static unsigned char * handle_commit_resource (fs_backend *be, fs_segment segment,
unsigned int length,
unsigned char *content)
{
if (segment > be->segments) {
fs_error(LOG_ERR, "invalid segment number: %d", segment);
return fsp_error_new(segment, "invalid segment number");
}
if (length > 0) {
fs_error(LOG_ERR, "commit_resource(%d) extraneous content", segment);
return fsp_error_new(segment, "extraneous content");
}
fs_res_import_commit(be, segment, 1);
return message_new(FS_DONE_OK, segment, 0);
}
static unsigned char * handle_delete_quads (fs_backend *be, fs_segment segment,
unsigned int length,
unsigned char *content)
{
if (segment > be->segments) {
fs_error(LOG_ERR, "invalid segment number: %d", segment);
return fsp_error_new(segment, "invalid segment number");
}
if (length < 32) {
fs_error(LOG_ERR, "delete_quads(%d) much too short", segment);
return fsp_error_new(segment, "much too short");
}
fs_rid_vector models, subjects, predicates, objects;
models.size = models.length = length / 32;
subjects.size = subjects.length = length / 32;
predicates.size = predicates.length = length / 32;
objects.size = objects.length = length / 32;
if (length < (models.size + subjects.size + predicates.size + objects.size) * 8) {
fs_error(LOG_ERR, "delete_quads(%d) too short (%d < %d)", segment, length,
(models.size + subjects.size + predicates.size + objects.size) * 8);
return fsp_error_new(segment, "too short");
}
models.data = (fs_rid *) content;
content += models.length * 8;
subjects.data = (fs_rid *) content;
content += subjects.length * 8;
predicates.data = (fs_rid *) content;
content += predicates.length * 8;
objects.data = (fs_rid *) content;
fs_rid_vector *args[4] = { &models, &subjects, &predicates, &objects };
fs_delete_quads(be, args);
/* FIXME, should check return value */
return message_new(FS_DONE_OK, 0, 0);
}
static unsigned char * handle_get_size_reverse (fs_backend *be, fs_segment segment,
unsigned int length,
unsigned char *content)
{
if (segment > be->segments) {
fs_error(LOG_ERR, "invalid segment number: %d", segment);
return fsp_error_new(segment, "invalid segment number");
}
if (length > 0) {
fs_error(LOG_ERR, "get_data_size(%d) extraneous content", segment);
return fsp_error_new(segment, "extraneous content");
}
fs_data_size size = fs_get_data_size(be, segment);
unsigned char *reply = message_new(FS_SIZE_REVERSE, segment, sizeof(size.quads_sr));
memcpy(reply + FS_HEADER, &size.quads_sr, sizeof(size.quads_sr));
return reply;
}
static unsigned char * handle_auth (fs_backend *be,
fs_segment segment,
unsigned int length,
unsigned char *content)
{
md5_state_t md5;
if (length <= 16) {
fs_error(LOG_ERR, "auth(%d) missing kbname", segment);
return fsp_error_new(segment, "missing kbname");
}
if (strncmp(be->db_name, (char *) content + 16, length - 16)) {
fs_error(LOG_ERR, "auth(%d) wrong kbname", segment);
return fsp_error_new(segment, "wrong kbname");
}
if (be->salt) {
unsigned char data[20], hash[16];
char string[33];
memcpy(data, (&be->salt), sizeof(be->salt));
memcpy(data + 4, content, 16);
md5_init(&md5);
md5_append(&md5, data, sizeof(data));
md5_finish(&md5, hash);
sprintf(string, "%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x",
hash[0], hash[1], hash[2], hash[3], hash[4], hash[5], hash[6], hash[7],
hash[8], hash[9], hash[10], hash[11], hash[12], hash[13], hash[14], hash[15]);
if (strcmp(string, be->hash)) {
fs_error(LOG_ERR, "auth(%d) invalid password", segment);
return fsp_error_new(segment, "invalid password");
}
}
/* in-band signal, string of features */
unsigned char *reply = message_new(FS_DONE_OK, 0, sizeof(feature_string));
memcpy(reply + FS_HEADER, feature_string, sizeof(feature_string));
return reply;
}
static unsigned char * handle_choose_segment (fs_backend *be, fs_segment segment,
unsigned int length,
unsigned char *content)
{
if (fs_backend_open_files(be, segment, O_RDWR | O_CREAT, FS_OPEN_ALL)) {
fs_error(LOG_ERR, "failed to open files for segment %d", segment);
return fsp_error_new(segment, "cannot open indexes");
}
return message_new(FS_DONE_OK, 0, 0);
}
static unsigned char * handle_get_query_times (fs_backend *be,
fs_segment segment,
unsigned int length,
unsigned char *content)
{
if (segment > be->segments) {
fs_error(LOG_ERR, "invalid segment number: %d", segment);
return fsp_error_new(segment, "invalid segment number");
}
if (length > 0) {
fs_error(LOG_ERR, "get_query_times(%d) extraneous content", segment);
return fsp_error_new(segment, "extraneous content");
}
fs_query_timing timing = fs_get_query_times(be, segment);
unsigned char *reply = message_new(FS_QUERY_TIMES, segment, sizeof(timing));
memcpy(reply + FS_HEADER, &timing, sizeof(timing));
return reply;
}
static unsigned char * handle_delete_models (fs_backend *be, fs_segment segment,
unsigned int length,
unsigned char *content)
{
if (segment > be->segments) {
fs_error(LOG_ERR, "invalid segment number: %d", segment);
return fsp_error_new(segment, "invalid segment number");
}
if (length < sizeof(fs_rid)) {
fs_error(LOG_ERR, "delete_models(%d) missing model RIDs", segment);
return fsp_error_new(segment, "missing model RIDs");
}
fs_rid_vector models;
models.size = models.length = length / sizeof(fs_rid);
models.data = (fs_rid *) content;
fs_delete_models(be, segment, &models);
return message_new(FS_DONE_OK, segment, 0);
}
static unsigned char * handle_stop_import (fs_backend *be, fs_segment segment,
unsigned int length,
unsigned char *content)
{
if (segment > be->segments) {
fs_error(LOG_ERR, "invalid segment number: %d", segment);
return fsp_error_new(segment, "invalid segment number");
}
if (length > 0) {
fs_error(LOG_ERR, "stop_import(%d) extraneous content", segment);
return fsp_error_new(segment, "extraneous content");
}
int ret = fs_stop_import(be, segment);
if (ret) {
return fsp_error_new(segment, "insert failed");
}
return message_new(FS_DONE_OK, segment, 0);
}
static unsigned char * handle_node_segments (fs_backend *be,
fs_segment segment,
unsigned int length,
unsigned char *content)
{
if (segment != 0) {
fs_error(LOG_ERR, "segments(%d) should only be sent with segment = 0", segment);
return fsp_error_new(segment, "only to be sent to segment = 0");
}
if (length > 0) {
fs_error(LOG_ERR, "segments(%d) extraneous content", segment);
return fsp_error_new(segment, "extraneous content");
}
char segments[be->segments];
fs_node_segments(be, segments);
unsigned char *reply = message_new(FS_NODE_SEGMENT_LIST, be->segments, be->segments);
memcpy(reply + FS_HEADER, segments, be->segments);
return reply;
}
static unsigned char * handle_or_fail(const char *name,
fsp_backend_fn handle_fn,
fs_backend *be,
fs_segment segment,
unsigned int length,
unsigned char *content)
{
if (handle_fn) {
return handle_fn(be, segment, length, content);
} else {
kb_error(LOG_ERR, "no implementation for %s", name);
return fsp_error_new(segment, "not implemented");
}
}
static unsigned char * handle_bnode_alloc (fs_backend *be,
fs_segment segment,
unsigned int length,
unsigned char *content)
{
if (segment != 0) {
fs_error(LOG_ERR, "bnode_alloc(%d) should only be sent to segment zero", segment);
return fsp_error_new(segment, "only to be sent to segment zero");
}
if (length != sizeof(int)) {
fs_error(LOG_ERR, "bnode_alloc(%d) missing count", segment);
return fsp_error_new(segment, "missing count");
}
int count;
memcpy(&count, content, sizeof(count));
unsigned char *reply = message_new(FS_BNODE_RANGE, 0, 16);
unsigned char *range = reply + FS_HEADER;
fs_bnode_alloc(be, count, (fs_rid *) range, (fs_rid *) (range + sizeof(fs_rid)));
return reply;
}
static unsigned char * handle_start_import (fs_backend *be, fs_segment segment,
unsigned int length,
unsigned char *content)
{
if (segment > be->segments) {
fs_error(LOG_ERR, "invalid segment number: %d", segment);
return fsp_error_new(segment, "invalid segment number");
}
if (length > 0) {
fs_error(LOG_ERR, "start_import(%d) extraneous content", segment);
return fsp_error_new(segment, "extraneous content");
}
float free_space = fs_free_disk(fs_backend_get_kb(be));
if (free_space < be->min_free) {
fs_error(LOG_ERR, "segment %d only has %.1f%% free space", segment, free_space);
return fsp_error_new(segment, "low disk space");
}
fs_start_import(be, segment);
return message_new(FS_DONE_OK, segment, 0);
}
static unsigned char * handle_transaction (fs_backend *be,
fs_segment segment,
unsigned int length,
unsigned char *content)
{
if (length != 1) {
fs_error(LOG_ERR, "transaction(%d), missing flag", segment);
return fsp_error_new(segment, "missing flag");
}
int ret = fs_backend_transaction(be, segment, *content);
if (ret == 2) {
if (*content == FS_TRANS_BEGIN) {
return fsp_error_new(segment, "transaction already begun");
} else {
return fsp_error_new(segment, "transaction not begun");
}
} else if (ret) {
return fsp_error_new(segment, "transaction error");
}
return message_new(FS_DONE_OK, 0, 0);
}
static void child (int conn, fsp_backend *backend, fs_backend *be)
{
int auth = 0;
while (1) {
fs_segment segment;
unsigned int length;
unsigned char *msg = message_recv(conn, &segment, &length);
unsigned char *reply = NULL;
unsigned char *content = msg + FS_HEADER;
if (!msg) {
/* if the connection is in fact closed, this won't matter,
but otherwise this error might help */
reply = fsp_error_new(segment, "protocol mismatch");
unsigned int* const l = (unsigned int *) (reply + 4);
unsigned int length = *l;
if (write(conn, reply, FS_HEADER + length) != (FS_HEADER+length)) {
fs_error(LOG_ERR, "write failed: %s", strerror(errno));
}
break;
}
if (auth) {
switch (msg[3]) {
case FS_NO_OP:
reply = fsp_handle_no_op(segment, length, content);
break;
case FS_RESOLVE:
reply = handle(backend->resolve, be, segment, length, content);
break;
case FS_BIND:
reply = handle(backend->bind, be, segment, length, content);
break;
case FS_PRICE_BIND:
reply = handle(backend->price, be, segment, length, content);
break;
case FS_DELETE_MODEL:
reply = handle(backend->delete_models, be, segment, length, content);
break;
case FS_INSERT_RESOURCE:
reply = handle(backend->insert_resource, be, segment, length, content);
break;
case FS_SEGMENTS:
reply = handle(backend->segments, be, segment, length, content);
break;
case FS_COMMIT_RESOURCE:
reply = handle(backend->commit_resource, be, segment, length, content);
break;
case FS_START_IMPORT:
reply = handle(backend->start_import, be, segment, length, content);
break;
case FS_STOP_IMPORT:
reply = handle(backend->stop_import, be, segment, length, content);
break;
case FS_GET_SIZE:
reply = handle(backend->get_data_size, be, segment, length, content);
break;
case FS_GET_IMPORT_TIMES:
reply = handle(backend->get_import_times, be, segment, length, content);
break;
case FS_INSERT_QUAD:
reply = handle(backend->insert_quad, be, segment, length, content);
break;
case FS_COMMIT_QUAD:
reply = handle(backend->commit_quad, be, segment, length, content);
break;
case FS_GET_QUERY_TIMES:
reply = handle(backend->get_query_times, be, segment, length, content);
break;
case FS_BIND_LIMIT:
reply = handle(backend->bind_limit, be, segment, length, content);
break;
case FS_BNODE_ALLOC:
reply = handle(backend->bnode_alloc, be, segment, length, content);
break;
case FS_RESOLVE_ATTR:
reply = handle(backend->resolve_attr, be, segment, length, content);
break;
case FS_DELETE_MODELS:
reply = handle(backend->delete_models, be, segment, length, content);
break;
case FS_NEW_MODELS:
reply = handle(backend->new_models, be, segment, length, content);
break;
case FS_BIND_FIRST:
reply = handle(backend->bind_first, be, segment, length, content);
break;
case FS_BIND_NEXT:
reply = handle(backend->bind_next, be, segment, length, content);
break;
case FS_BIND_DONE:
reply = handle(backend->bind_done, be, segment, length, content);
break;
case FS_TRANSACTION:
reply = handle(backend->transaction, be, segment, length, content);
break;
case FS_NODE_SEGMENTS:
reply = handle(backend->node_segments, be, segment, length, content);
break;
case FS_REVERSE_BIND:
reply = handle(backend->reverse_bind, be, segment, length, content);
break;
case FS_LOCK:
reply = handle(backend->lock, be, segment, length, content);
break;
case FS_UNLOCK:
reply = handle(backend->unlock, be, segment, length, content);
break;
case FS_GET_SIZE_REVERSE:
reply = handle(backend->get_size_reverse, be, segment, length, content);
break;
case FS_GET_QUAD_FREQ:
reply = handle(backend->get_quad_freq, be, segment, length, content);
break;
case FS_CHOOSE_SEGMENT:
reply = handle(backend->choose_segment, be, segment, length, content);
break;
case FS_DELETE_QUADS:
reply = handle(backend->delete_quads, be, segment, length, content);
break;
case FS_GET_UUID:
reply = handle(backend->get_uuid, be, segment, length, content);
break;
default:
kb_error(LOG_WARNING, "unexpected message type (%d)", msg[3]);
reply = fsp_error_new(segment, "unexpected message type");
break;
}
} else if (msg[3] == FS_AUTH) {
if (backend->auth) {
reply = backend->auth(be, segment, length, content);
} else {
reply = message_new(FS_DONE_OK, segment, 0);
}
if (reply[3] == FS_DONE_OK) auth = 1;
} else {
reply = fsp_error_new(segment, "authenticate before continuing");
}
if (reply) {
unsigned int* const l = (unsigned int *) (reply + 4);
unsigned int length = *l;
if (write(conn, reply, FS_HEADER + length) <= 0) {
kb_error(LOG_WARNING, "write reply failed");
}
free(reply);
}
free(msg);
}
}
static unsigned char * handle_bind_first (fs_backend *be, fs_segment segment,
unsigned int length,
unsigned char *content)
{
unsigned char *reply;
if (segment > be->segments) {
fs_error(LOG_ERR, "invalid segment number: %d", segment);
return fsp_error_new(segment, "invalid segment number");
}
if (length < 32) {
fs_error(LOG_ERR, "bind_first(%d) much too short", segment);
return fsp_error_new(segment, "much too short");
}
fs_rid_vector models, subjects, predicates, objects;
unsigned int flags, value;
int count;
memcpy(&flags, content, sizeof (flags));
memcpy(&count, content + 4, sizeof (count));
memcpy(&value, content + 12, sizeof (models.length));
models.size = models.length = value / 8;
memcpy(&value, content + 16, sizeof (subjects.length));
subjects.size = subjects.length = value / 8;
memcpy(&value, content + 20, sizeof (predicates.length));
predicates.size = predicates.length = value / 8;
memcpy(&value, content + 24, sizeof (objects.length));
objects.size = objects.length = value / 8;
content += 32;
if (length < (models.size + subjects.size + predicates.size + objects.size) * 8 + 32) {
fs_error(LOG_ERR, "bind_first(%d) too short", segment);
return fsp_error_new(segment, "too short");
}
models.data = (fs_rid *) content;
content += models.length * 8;
subjects.data = (fs_rid *) content;
content += subjects.length * 8;
predicates.data = (fs_rid *) content;
content += predicates.length * 8;
objects.data = (fs_rid *) content;
fs_rid_vector **bindings;
bindings = fs_bind_first(be, segment, flags, &models, &subjects,
&predicates, &objects, count);
int k, cols = 0;
for (k = 0; k < 4; ++k) {
if (flags & 1 << k) cols++;
}
if (bindings == NULL) {
/* NULL => no match */
reply = message_new(FS_NO_MATCH, segment, 0);
cols = 0;
} else if (cols == 0) {
/* Zero columns => match with no binding */
reply = message_new(FS_BIND_LIST, segment, 0);
} else {
/* otherwise return bindings */
reply = message_new(FS_BIND_LIST, segment, bindings[0]->length * 8 * cols);
unsigned char *data = reply + FS_HEADER;
for (k= 0; k < cols; ++k) {
memcpy(data, bindings[k]->data, bindings[k]->length * 8);
data += bindings[k]->length * 8;
}
}
for (k = 0; k < cols; ++k) {
fs_rid_vector_free(bindings[k]);
}
free(bindings);
return reply;
}
