drizzle-orm
Version:
Drizzle ORM package for SQL databases
41 lines • 1.07 kB
JavaScript
function hexToBytes(hex) {
const bytes = [];
for (let c = 0; c < hex.length; c += 2) {
bytes.push(Number.parseInt(hex.slice(c, c + 2), 16));
}
return new Uint8Array(bytes);
}
function bytesToFloat64(bytes, offset) {
const buffer = new ArrayBuffer(8);
const view = new DataView(buffer);
for (let i = 0; i < 8; i++) {
view.setUint8(i, bytes[offset + i]);
}
return view.getFloat64(0, true);
}
function parseEWKB(hex) {
const bytes = hexToBytes(hex);
let offset = 0;
const byteOrder = bytes[offset];
offset += 1;
const view = new DataView(bytes.buffer);
const geomType = view.getUint32(offset, byteOrder === 1);
offset += 4;
let _srid;
if (geomType & 536870912) {
_srid = view.getUint32(offset, byteOrder === 1);
offset += 4;
}
if ((geomType & 65535) === 1) {
const x = bytesToFloat64(bytes, offset);
offset += 8;
const y = bytesToFloat64(bytes, offset);
offset += 8;
return [x, y];
}
throw new Error("Unsupported geometry type");
}
export {
parseEWKB
};
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