int view_spatial_filter(const sized_buf *k, const sized_buf *v,
const bitmap_t *bm)
{
uint16_t partition = 0;
(void) k;
partition = decode_raw16(*((raw_16 *) v->buf));
return is_bit_set(bm, partition);
}
// Attempts to initialize the database from a header at the given file position
static couchstore_error_t find_header_at_pos(Db *db, cs_off_t pos)
{
int errcode = COUCHSTORE_SUCCESS;
raw_file_header *header_buf = NULL;
uint8_t buf[2];
ssize_t readsize = db->file.ops->pread(db->file.handle, buf, 2, pos);
error_unless(readsize == 2, COUCHSTORE_ERROR_READ);
if (buf[0] == 0) {
return COUCHSTORE_ERROR_NO_HEADER;
} else if (buf[0] != 1) {
return COUCHSTORE_ERROR_CORRUPT;
}
int header_len = pread_header(&db->file, pos, (char**)&header_buf);
if (header_len < 0) {
error_pass(header_len);
}
db->header.position = pos;
db->header.disk_version = decode_raw08(header_buf->version);
error_unless(db->header.disk_version == COUCH_DISK_VERSION,
COUCHSTORE_ERROR_HEADER_VERSION);
db->header.update_seq = decode_raw48(header_buf->update_seq);
db->header.purge_seq = decode_raw48(header_buf->purge_seq);
db->header.purge_ptr = decode_raw48(header_buf->purge_ptr);
error_unless(db->header.purge_ptr <= db->header.position, COUCHSTORE_ERROR_CORRUPT);
int seqrootsize = decode_raw16(header_buf->seqrootsize);
int idrootsize = decode_raw16(header_buf->idrootsize);
int localrootsize = decode_raw16(header_buf->localrootsize);
error_unless(header_len == HEADER_BASE_SIZE + seqrootsize + idrootsize + localrootsize,
COUCHSTORE_ERROR_CORRUPT);
char *root_data = (char*) (header_buf + 1); // i.e. just past *header_buf
error_pass(read_db_root(db, &db->header.by_seq_root, root_data, seqrootsize));
root_data += seqrootsize;
error_pass(read_db_root(db, &db->header.by_id_root, root_data, idrootsize));
root_data += idrootsize;
error_pass(read_db_root(db, &db->header.local_docs_root, root_data, localrootsize));
cleanup:
free(header_buf);
return errcode;
}
int spatial_key_cmp(const sized_buf *key1, const sized_buf *key2,
const void *user_ctx)
{
scale_factor_t *sf =
((view_spatial_builder_ctx_t *) user_ctx)->scale_factor;
uint16_t mbb1_num = decode_raw16(*((raw_16 *) key1->buf));
uint16_t mbb2_num = decode_raw16(*((raw_16 *) key2->buf));
sized_mbb_t mbbs[2];
double *mbbs_center[2];
uint32_t *mbbs_scaled[2];
unsigned char *mbbs_zcode[2];
int res;
mbbs[0].num = mbb1_num;
mbbs[0].mbb = (double *)(key1->buf + sizeof(uint16_t));
mbbs_center[0] = spatial_center(&mbbs[0]);
mbbs_scaled[0] = spatial_scale_point(mbbs_center[0], sf);
mbbs_zcode[0] = interleave_uint32s(mbbs_scaled[0], sf->dim);
mbbs[1].num = mbb2_num;
mbbs[1].mbb = (double *)(key2->buf + sizeof(uint16_t));
mbbs_center[1] = spatial_center(&mbbs[1]);
mbbs_scaled[1] = spatial_scale_point(mbbs_center[1], sf);
mbbs_zcode[1] = interleave_uint32s(mbbs_scaled[1], sf->dim);
res = memcmp(mbbs_zcode[0], mbbs_zcode[1], sf->dim * BYTE_PER_COORD);
free(mbbs_center[0]);
free(mbbs_scaled[0]);
free(mbbs_zcode[0]);
free(mbbs_center[1]);
free(mbbs_scaled[1]);
free(mbbs_zcode[1]);
return res;
}
static node_pointer *read_pointer(arena* a, sized_buf *key, char *buf)
{
//Parse KP pair into a node_pointer {K, {ptr, reduce_value, subtreesize}}
node_pointer *p = (node_pointer *) arena_alloc(a, sizeof(node_pointer));
if (!p) {
return NULL;
}
const raw_node_pointer *raw = (const raw_node_pointer*)buf;
p->pointer = decode_raw48(raw->pointer);
p->subtreesize = decode_raw48(raw->subtreesize);
p->reduce_value.size = decode_raw16(raw->reduce_value_size);
p->reduce_value.buf = buf + sizeof(*raw);
p->key = *key;
return p;
}
STATIC couchstore_error_t decode_spatial_key(const char *key, sized_mbb_t *mbb)
{
mbb->num = decode_raw16(*((raw_16 *) key));
mbb->mbb = (double *)(key + 2);
return COUCHSTORE_SUCCESS;
}
static void test_raw_16(uint16_t value)
{
raw_16 raw;
raw = encode_raw16(value);
assert(decode_raw16(raw) == value);
}
static couchstore_error_t btree_lookup_inner(couchfile_lookup_request *rq,
uint64_t diskpos,
int current,
int end)
{
int bufpos = 1, nodebuflen = 0;
if (current == end) {
return 0;
}
couchstore_error_t errcode = COUCHSTORE_SUCCESS;
char *nodebuf = NULL;
nodebuflen = pread_compressed(rq->file, diskpos, &nodebuf);
error_unless(nodebuflen >= 0, nodebuflen); // if negative, it's an error code
if (nodebuf[0] == 0) { //KP Node
while (bufpos < nodebuflen && current < end) {
sized_buf cmp_key, val_buf;
bufpos += read_kv(nodebuf + bufpos, &cmp_key, &val_buf);
if (rq->cmp.compare(&cmp_key, rq->keys[current]) >= 0) {
if (rq->fold) {
rq->in_fold = 1;
}
uint64_t pointer = 0;
int last_item = current;
//Descend into the pointed to node.
//with all keys < item key.
do {
last_item++;
} while (last_item < end && rq->cmp.compare(&cmp_key, rq->keys[last_item]) >= 0);
const raw_node_pointer *raw = (const raw_node_pointer*)val_buf.buf;
if(rq->node_callback) {
uint64_t subtreeSize = decode_raw48(raw->subtreesize);
sized_buf reduce_value =
{val_buf.buf + sizeof(raw_node_pointer), decode_raw16(raw->reduce_value_size)};
error_pass(rq->node_callback(rq, subtreeSize, &reduce_value));
}
pointer = decode_raw48(raw->pointer);
error_pass(btree_lookup_inner(rq, pointer, current, last_item));
if (!rq->in_fold) {
current = last_item;
}
if(rq->node_callback) {
error_pass(rq->node_callback(rq, 0, NULL));
}
}
}
} else if (nodebuf[0] == 1) { //KV Node
while (bufpos < nodebuflen && current < end) {
sized_buf cmp_key, val_buf;
bufpos += read_kv(nodebuf + bufpos, &cmp_key, &val_buf);
int cmp_val = rq->cmp.compare(&cmp_key, rq->keys[current]);
if (cmp_val >= 0 && rq->fold && !rq->in_fold) {
rq->in_fold = 1;
} else if (rq->in_fold && (current + 1) < end &&
(rq->cmp.compare(&cmp_key, rq->keys[current + 1])) > 0) {
//We've hit a key past the end of our range.
rq->in_fold = 0;
rq->fold = 0;
current = end;
}
if (cmp_val == 0 || (cmp_val > 0 && rq->in_fold)) {
//Found
error_pass(rq->fetch_callback(rq, &cmp_key, &val_buf));
if (!rq->in_fold) {
current++;
}
}
}
}
//Any remaining items are not found.
while (current < end && !rq->fold) {
error_pass(rq->fetch_callback(rq, rq->keys[current], NULL));
current++;
}
cleanup:
free(nodebuf);
return errcode;
}
