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#include "shapefile.h"
namespace shapefile
{
ShapefileHeader::ShapefileHeader(std::istream &stream)
{
uint8_t buffer[100];
stream.read((char *)buffer, 100);
// Little endian
file_code = swap_endian<int32_t>(*((int32_t *)&buffer[0]));
unused1 = swap_endian<int32_t>(*((int32_t *)&buffer[4]));
unused2 = swap_endian<int32_t>(*((int32_t *)&buffer[8]));
unused3 = swap_endian<int32_t>(*((int32_t *)&buffer[12]));
unused4 = swap_endian<int32_t>(*((int32_t *)&buffer[16]));
unused5 = swap_endian<int32_t>(*((int32_t *)&buffer[20]));
file_length = swap_endian<int32_t>(*((int32_t *)&buffer[24])) * 2;
// Big endian
version = *((int32_t *)&buffer[28]);
shape_type = *((int32_t *)&buffer[32]);
bounding_box_xmin = *((double *)&buffer[36]);
bounding_box_ymin = *((double *)&buffer[44]);
bounding_box_xmax = *((double *)&buffer[52]);
bounding_box_ymax = *((double *)&buffer[60]);
bounding_box_zmin = *((double *)&buffer[68]);
bounding_box_zmax = *((double *)&buffer[76]);
bounding_box_mmin = *((double *)&buffer[84]);
bounding_box_mmax = *((double *)&buffer[92]);
}
RecordHeader::RecordHeader(std::istream &stream)
{
uint8_t buffer[12];
stream.read((char *)buffer, 12);
// Little endian
record_number = swap_endian<int32_t>(*((int32_t *)&buffer[0]));
content_length = swap_endian<int32_t>(*((int32_t *)&buffer[4])) * 2 - 4;
// Big endian
shape_type = *((int32_t *)&buffer[8]);
}
NullShapeRecord::NullShapeRecord(std::istream & /*stream*/, RecordHeader &header) : RecordHeader(header)
{
// Empty
}
PointRecord::PointRecord(std::istream &stream, RecordHeader &header) : RecordHeader(header)
{
if (header.content_length != 16)
throw std::runtime_error("Point record should be 16-bytes, but is " + std::to_string(header.content_length) + "!");
uint8_t buffer[16];
stream.read((char *)buffer, 16);
// Big endian
point = *((point_t *)&buffer[0]);
}
MultiPointRecord::MultiPointRecord(std::istream &stream, RecordHeader &header) : RecordHeader(header)
{
uint8_t *buffer = new uint8_t[header.content_length];
stream.read((char *)buffer, header.content_length);
// Big endian
box = *((box_t *)&buffer[0]);
point_number = *((int32_t *)&buffer[32]);
for (int i = 0; i < point_number; i++)
{
point_t p = *((point_t *)&buffer[36 + 8 * (i * 2)]);
points.push_back(p);
}
delete[] buffer;
}
PolyLineRecord::PolyLineRecord(std::istream &stream, RecordHeader &header) : RecordHeader(header)
{
uint8_t *buffer = new uint8_t[header.content_length];
stream.read((char *)buffer, header.content_length);
// Big endian
box = *((box_t *)&buffer[0]);
part_number = *((int32_t *)&buffer[32]);
point_number = *((int32_t *)&buffer[36]);
std::vector<int32_t> parts; // Parse all parts
for (int i = 0; i < part_number; i++)
{
int32_t part = *((int32_t *)&buffer[40 + 4 * i]);
parts.push_back(part);
}
std::vector<point_t> points; // Parse all points
for (int i = 0; i < point_number; i++)
{
point_t p = *((point_t *)&buffer[40 + 4 * part_number + 8 * (i * 2)]);
points.push_back(p);
}
// Now get all points for each part, except the last
for (int pn = 0; pn < part_number - 1; pn++)
{
std::vector<point_t> part_points;
int part_start = parts[pn];
int part_end = parts[pn + 1];
part_points.insert(part_points.end(), &points[part_start], &points[part_end]);
parts_points.push_back(part_points);
}
// And the last
{
std::vector<point_t> part_points;
int part_start = parts[part_number - 1];
part_points.insert(part_points.end(), &points[part_start], &points[points.size() - 1]);
parts_points.push_back(part_points);
}
delete[] buffer;
}
PolygonRecord::PolygonRecord(std::istream &stream, RecordHeader &header) : PolyLineRecord(stream, header)
{
}
Shapefile::Shapefile(std::istream &stream) : header(stream)
{
while (!stream.eof())
{
shapefile::RecordHeader recordHeader(stream);
if (stream.tellg() < 0) // Safety
continue;
if (recordHeader.shape_type == shapefile::Point)
{
shapefile::PointRecord pointRecord(stream, recordHeader);
point_records.push_back(pointRecord);
}
else if (recordHeader.shape_type == shapefile::MultiPoint)
{
shapefile::MultiPointRecord multiPointRecord(stream, recordHeader);
multipoint_records.push_back(multiPointRecord);
}
else if (recordHeader.shape_type == shapefile::PolyLine)
{
shapefile::PolyLineRecord polyLineRecord(stream, recordHeader);
polyline_records.push_back(polyLineRecord);
}
else if (recordHeader.shape_type == shapefile::Polygon)
{
shapefile::PolygonRecord polygonRecord(stream, recordHeader);
polygon_records.push_back(polygonRecord);
}
else
{
uint8_t *buffer = new uint8_t[recordHeader.content_length];
stream.read((char *)buffer, recordHeader.content_length);
delete[] buffer;
}
}
}
}
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