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FlatGeobuf column type parsing [#2]

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This commit is contained in:
Brandon Liu
2022-03-27 19:13:12 +08:00
parent 8a5a2496c3
commit 88cedf54d4
2 changed files with 56 additions and 3 deletions
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flatgeobuf.cpp
+55 -2
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@@ -4,6 +4,7 @@
#include "projection.hpp"
#include "flatgeobuf/feature_generated.h"
#include "flatgeobuf/header_generated.h"
#include "milo/dtoa_milo.h"
using namespace std;
@@ -45,7 +46,7 @@ drawvec readGeometry(const FlatGeobuf::Geometry *geometry, FlatGeobuf::GeometryT
for (unsigned int i = 0; i < xy->size(); i+=2) {
long long x, y;
projection->project(xy->Get(i), xy->Get(i+1), 32, &x, &y);
if (i == 0 || (ends != nullptr && current_end < ends->size() && i == ends->Get(current_end))) {
if (i == 0 || (ends != nullptr && current_end < ends->size() && i == ends->Get(current_end)*2)) {
dv.push_back(draw(VT_MOVETO, x, y));
if (i > 0) current_end++;
} else {
@@ -62,6 +63,14 @@ void parse_flatgeobuf(std::vector<struct serialization_state> *sst, const char *
auto features_count = header->features_count();
auto node_size = header->index_node_size();
vector<string> h_column_names;
vector<FlatGeobuf::ColumnType> h_column_types;
for (size_t i = 0; i < header->columns()->size(); i++) {
h_column_names.push_back(header->columns()->Get(i)->name()->c_str());
h_column_types.push_back(header->columns()->Get(i)->type());
}
auto index_size = PackedRTreeSize(features_count,node_size);
auto h_geometry_type = header->geometry_type();
@@ -90,6 +99,7 @@ void parse_flatgeobuf(std::vector<struct serialization_state> *sst, const char *
auto feature_size = flatbuffers::GetPrefixedSize((const uint8_t *)start);
auto feature = FlatGeobuf::GetSizePrefixedFeature(start);
drawvec dv = readGeometry(feature->geometry(), h_geometry_type);
sf.layer = layer;
@@ -101,9 +111,52 @@ void parse_flatgeobuf(std::vector<struct serialization_state> *sst, const char *
sf.feature_minzoom = false;
sf.seq = (*my_sst->layer_seq);
sf.geometry = dv;
sf.t = 4;
sf.t = 3;
vector<string> full_keys;
vector<serial_val> full_values;
// assume tabular schema with columns in header
size_t p_pos = 0;
while (p_pos < feature->properties()->size()) {
uint16_t col_idx;
memcpy(&col_idx, feature->properties()->data() + p_pos, sizeof(col_idx));
FlatGeobuf::ColumnType col_type = h_column_types[col_idx];
serial_val sv;
if (col_type == FlatGeobuf::ColumnType::Long) {
sv.type = mvt_double; // this is quirky
uint64_t long_val;
memcpy(&long_val, feature->properties()->data() + p_pos + 2, sizeof(long_val));
sv.s = to_string(long_val);
p_pos += 2 + 8;
} else if (col_type == FlatGeobuf::ColumnType::Double) {
sv.type = mvt_double;
double double_val;
memcpy(&double_val, feature->properties()->data() + p_pos + 2, sizeof(double_val));
sv.s = milo::dtoa_milo(double_val);
p_pos += 2 + 8;
} else if (col_type == FlatGeobuf::ColumnType::String) {
sv.type = mvt_string;
uint32_t str_len;
memcpy(&str_len, feature->properties()->data() + p_pos + 2, sizeof(str_len));
string s{reinterpret_cast<const char*>(feature->properties()->data() + p_pos + 2 + 4), str_len};
sv.s = s;
p_pos += 2 + 4 + str_len;
} else {
fprintf(stderr, "flatgeobuf has unsupported column type\n");
exit(EXIT_FAILURE);
}
full_keys.push_back(h_column_names[col_idx]);
full_values.push_back(sv);
}
sf.full_keys = full_keys;
sf.full_values = full_values;
serialize_feature(my_sst, sf);
start += 4 + feature_size;
}
}