@loaders.gl/shapefile/dist/index.cjs

Loader for the Shapefile Format

"use strict";
var __defProp = Object.defineProperty;
var __getOwnPropDesc = Object.getOwnPropertyDescriptor;
var __getOwnPropNames = Object.getOwnPropertyNames;
var __hasOwnProp = Object.prototype.hasOwnProperty;
var __export = (target, all) => {
  for (var name in all)
    __defProp(target, name, { get: all[name], enumerable: true });
};
var __copyProps = (to, from, except, desc) => {
  if (from && typeof from === "object" || typeof from === "function") {
    for (let key of __getOwnPropNames(from))
      if (!__hasOwnProp.call(to, key) && key !== except)
        __defProp(to, key, { get: () => from[key], enumerable: !(desc = __getOwnPropDesc(from, key)) || desc.enumerable });
  }
  return to;
};
var __toCommonJS = (mod) => __copyProps(__defProp({}, "__esModule", { value: true }), mod);

// dist/index.js
var dist_exports = {};
__export(dist_exports, {
  DBFLoader: () => DBFLoader,
  DBFWorkerLoader: () => DBFWorkerLoader,
  SHPLoader: () => SHPLoader,
  SHPWorkerLoader: () => SHPWorkerLoader,
  ShapefileLoader: () => ShapefileLoader,
  _BinaryChunkReader: () => BinaryChunkReader,
  _BinaryReader: () => BinaryReader,
  _zipBatchIterators: () => zipBatchIterators
});
module.exports = __toCommonJS(dist_exports);

// dist/lib/streaming/binary-chunk-reader.js
var BinaryChunkReader = class {
  offset;
  arrayBuffers;
  ended;
  maxRewindBytes;
  constructor(options) {
    const { maxRewindBytes = 0 } = options || {};
    this.offset = 0;
    this.arrayBuffers = [];
    this.ended = false;
    this.maxRewindBytes = maxRewindBytes;
  }
  /**
   * @param arrayBuffer
   */
  write(arrayBuffer) {
    this.arrayBuffers.push(arrayBuffer);
  }
  end() {
    this.arrayBuffers = [];
    this.ended = true;
  }
  /**
   * Has enough bytes available in array buffers
   *
   * @param bytes Number of bytes
   * @return boolean
   */
  hasAvailableBytes(bytes) {
    let bytesAvailable = -this.offset;
    for (const arrayBuffer of this.arrayBuffers) {
      bytesAvailable += arrayBuffer.byteLength;
      if (bytesAvailable >= bytes) {
        return true;
      }
    }
    return false;
  }
  /**
   * Find offsets of byte ranges within this.arrayBuffers
   *
   * @param  bytes Byte length to read
   * @return Arrays with byte ranges pointing to this.arrayBuffers, Output type is nested array, e.g. [ [0, [1, 2]], ...]
   */
  findBufferOffsets(bytes) {
    let offset = -this.offset;
    const selectedBuffers = [];
    for (let i = 0; i < this.arrayBuffers.length; i++) {
      const buf = this.arrayBuffers[i];
      if (offset + buf.byteLength <= 0) {
        offset += buf.byteLength;
        continue;
      }
      const start = offset <= 0 ? Math.abs(offset) : 0;
      let end;
      if (start + bytes <= buf.byteLength) {
        end = start + bytes;
        selectedBuffers.push([i, [start, end]]);
        return selectedBuffers;
      }
      end = buf.byteLength;
      selectedBuffers.push([i, [start, end]]);
      bytes -= buf.byteLength - start;
      offset += buf.byteLength;
    }
    return null;
  }
  /**
   * Get the required number of bytes from the iterator
   *
   * @param bytes Number of bytes
   * @return DataView with data
   */
  getDataView(bytes) {
    const bufferOffsets = this.findBufferOffsets(bytes);
    if (!bufferOffsets && this.ended) {
      throw new Error("binary data exhausted");
    }
    if (!bufferOffsets) {
      return null;
    }
    if (bufferOffsets.length === 1) {
      const [bufferIndex, [start, end]] = bufferOffsets[0];
      const arrayBuffer = this.arrayBuffers[bufferIndex];
      const view2 = new DataView(arrayBuffer, start, end - start);
      this.offset += bytes;
      this.disposeBuffers();
      return view2;
    }
    const view = new DataView(this._combineArrayBuffers(bufferOffsets));
    this.offset += bytes;
    this.disposeBuffers();
    return view;
  }
  /**
   * Dispose of old array buffers
   */
  disposeBuffers() {
    while (this.arrayBuffers.length > 0 && this.offset - this.maxRewindBytes >= this.arrayBuffers[0].byteLength) {
      this.offset -= this.arrayBuffers[0].byteLength;
      this.arrayBuffers.shift();
    }
  }
  /**
   * Copy multiple ArrayBuffers into one contiguous ArrayBuffer
   *
   * In contrast to concatenateArrayBuffers, this only copies the necessary
   * portions of the source arrays, rather than first copying the entire arrays
   * then taking a part of them.
   *
   * @param bufferOffsets List of internal array offsets
   * @return New contiguous ArrayBuffer
   */
  _combineArrayBuffers(bufferOffsets) {
    let byteLength = 0;
    for (const bufferOffset of bufferOffsets) {
      const [start, end] = bufferOffset[1];
      byteLength += end - start;
    }
    const result = new Uint8Array(byteLength);
    let resultOffset = 0;
    for (const bufferOffset of bufferOffsets) {
      const [bufferIndex, [start, end]] = bufferOffset;
      const sourceArray = new Uint8Array(this.arrayBuffers[bufferIndex]);
      result.set(sourceArray.subarray(start, end), resultOffset);
      resultOffset += end - start;
    }
    return result.buffer;
  }
  /**
   * @param bytes
   */
  skip(bytes) {
    this.offset += bytes;
  }
  /**
   * @param bytes
   */
  rewind(bytes) {
    this.offset -= bytes;
  }
};

// dist/lib/parsers/parse-shp-header.js
var LITTLE_ENDIAN = true;
var BIG_ENDIAN = false;
var SHP_MAGIC_NUMBER = 9994;
function parseSHPHeader(headerView) {
  const header = {
    magic: headerView.getInt32(0, BIG_ENDIAN),
    // Length is stored as # of 2-byte words; multiply by 2 to get # of bytes
    length: headerView.getInt32(24, BIG_ENDIAN) * 2,
    version: headerView.getInt32(28, LITTLE_ENDIAN),
    type: headerView.getInt32(32, LITTLE_ENDIAN),
    bbox: {
      minX: headerView.getFloat64(36, LITTLE_ENDIAN),
      minY: headerView.getFloat64(44, LITTLE_ENDIAN),
      minZ: headerView.getFloat64(68, LITTLE_ENDIAN),
      minM: headerView.getFloat64(84, LITTLE_ENDIAN),
      maxX: headerView.getFloat64(52, LITTLE_ENDIAN),
      maxY: headerView.getFloat64(60, LITTLE_ENDIAN),
      maxZ: headerView.getFloat64(76, LITTLE_ENDIAN),
      maxM: headerView.getFloat64(92, LITTLE_ENDIAN)
    }
  };
  if (header.magic !== SHP_MAGIC_NUMBER) {
    console.error(`SHP file: bad magic number ${header.magic}`);
  }
  if (header.version !== 1e3) {
    console.error(`SHP file: bad version ${header.version}`);
  }
  return header;
}

// dist/lib/parsers/parse-shp-geometry.js
var LITTLE_ENDIAN2 = true;
function parseRecord(view, options) {
  const { _maxDimensions = 4 } = (options == null ? void 0 : options.shp) || {};
  let offset = 0;
  const type = view.getInt32(offset, LITTLE_ENDIAN2);
  offset += Int32Array.BYTES_PER_ELEMENT;
  switch (type) {
    case 0:
      return parseNull();
    case 1:
      return parsePoint(view, offset, Math.min(2, _maxDimensions));
    case 3:
      return parsePoly(view, offset, Math.min(2, _maxDimensions), "LineString");
    case 5:
      return parsePoly(view, offset, Math.min(2, _maxDimensions), "Polygon");
    case 8:
      return parseMultiPoint(view, offset, Math.min(2, _maxDimensions));
    case 11:
      return parsePoint(view, offset, Math.min(4, _maxDimensions));
    case 13:
      return parsePoly(view, offset, Math.min(4, _maxDimensions), "LineString");
    case 15:
      return parsePoly(view, offset, Math.min(4, _maxDimensions), "Polygon");
    case 18:
      return parseMultiPoint(view, offset, Math.min(4, _maxDimensions));
    case 21:
      return parsePoint(view, offset, Math.min(3, _maxDimensions));
    case 23:
      return parsePoly(view, offset, Math.min(3, _maxDimensions), "LineString");
    case 25:
      return parsePoly(view, offset, Math.min(3, _maxDimensions), "Polygon");
    case 28:
      return parseMultiPoint(view, offset, Math.min(3, _maxDimensions));
    default:
      throw new Error(`unsupported shape type: ${type}`);
  }
}
function parseNull() {
  return null;
}
function parsePoint(view, offset, dim) {
  let positions;
  [positions, offset] = parsePositions(view, offset, 1, dim);
  return {
    positions: { value: positions, size: dim },
    type: "Point"
  };
}
function parseMultiPoint(view, offset, dim) {
  offset += 4 * Float64Array.BYTES_PER_ELEMENT;
  const nPoints = view.getInt32(offset, LITTLE_ENDIAN2);
  offset += Int32Array.BYTES_PER_ELEMENT;
  let xyPositions = null;
  let mPositions = null;
  let zPositions = null;
  [xyPositions, offset] = parsePositions(view, offset, nPoints, 2);
  if (dim === 4) {
    offset += 2 * Float64Array.BYTES_PER_ELEMENT;
    [zPositions, offset] = parsePositions(view, offset, nPoints, 1);
  }
  if (dim >= 3) {
    offset += 2 * Float64Array.BYTES_PER_ELEMENT;
    [mPositions, offset] = parsePositions(view, offset, nPoints, 1);
  }
  const positions = concatPositions(xyPositions, mPositions, zPositions);
  return {
    positions: { value: positions, size: dim },
    type: "Point"
  };
}
function parsePoly(view, offset, dim, type) {
  offset += 4 * Float64Array.BYTES_PER_ELEMENT;
  const nParts = view.getInt32(offset, LITTLE_ENDIAN2);
  offset += Int32Array.BYTES_PER_ELEMENT;
  const nPoints = view.getInt32(offset, LITTLE_ENDIAN2);
  offset += Int32Array.BYTES_PER_ELEMENT;
  const bufferOffset = view.byteOffset + offset;
  const bufferLength = nParts * Int32Array.BYTES_PER_ELEMENT;
  const ringIndices = new Int32Array(nParts + 1);
  ringIndices.set(new Int32Array(view.buffer.slice(bufferOffset, bufferOffset + bufferLength)));
  ringIndices[nParts] = nPoints;
  offset += nParts * Int32Array.BYTES_PER_ELEMENT;
  let xyPositions = null;
  let mPositions = null;
  let zPositions = null;
  [xyPositions, offset] = parsePositions(view, offset, nPoints, 2);
  if (dim === 4) {
    offset += 2 * Float64Array.BYTES_PER_ELEMENT;
    [zPositions, offset] = parsePositions(view, offset, nPoints, 1);
  }
  if (dim >= 3) {
    offset += 2 * Float64Array.BYTES_PER_ELEMENT;
    [mPositions, offset] = parsePositions(view, offset, nPoints, 1);
  }
  const positions = concatPositions(xyPositions, mPositions, zPositions);
  if (type === "LineString") {
    return {
      type,
      positions: { value: positions, size: dim },
      pathIndices: { value: ringIndices, size: 1 }
    };
  }
  const polygonIndices = [];
  for (let i = 1; i < ringIndices.length; i++) {
    const startRingIndex = ringIndices[i - 1];
    const endRingIndex = ringIndices[i];
    const ring = xyPositions.subarray(startRingIndex * 2, endRingIndex * 2);
    const sign = getWindingDirection(ring);
    if (sign > 0) {
      polygonIndices.push(startRingIndex);
    }
  }
  polygonIndices.push(nPoints);
  return {
    type,
    positions: { value: positions, size: dim },
    primitivePolygonIndices: { value: ringIndices, size: 1 },
    // TODO: Dynamically choose Uint32Array over Uint16Array only when
    // necessary. I believe the implementation requires nPoints to be the
    // largest value in the array, so you should be able to use Uint32Array only
    // when nPoints > 65535.
    polygonIndices: { value: new Uint32Array(polygonIndices), size: 1 }
  };
}
function parsePositions(view, offset, nPoints, dim) {
  const bufferOffset = view.byteOffset + offset;
  const bufferLength = nPoints * dim * Float64Array.BYTES_PER_ELEMENT;
  return [
    new Float64Array(view.buffer.slice(bufferOffset, bufferOffset + bufferLength)),
    offset + bufferLength
  ];
}
function concatPositions(xyPositions, mPositions, zPositions) {
  if (!(mPositions || zPositions)) {
    return xyPositions;
  }
  let arrayLength = xyPositions.length;
  let nDim = 2;
  if (zPositions && zPositions.length) {
    arrayLength += zPositions.length;
    nDim++;
  }
  if (mPositions && mPositions.length) {
    arrayLength += mPositions.length;
    nDim++;
  }
  const positions = new Float64Array(arrayLength);
  for (let i = 0; i < xyPositions.length / 2; i++) {
    positions[nDim * i] = xyPositions[i * 2];
    positions[nDim * i + 1] = xyPositions[i * 2 + 1];
  }
  if (zPositions && zPositions.length) {
    for (let i = 0; i < zPositions.length; i++) {
      positions[nDim * i + 2] = zPositions[i];
    }
  }
  if (mPositions && mPositions.length) {
    for (let i = 0; i < mPositions.length; i++) {
      positions[nDim * i + (nDim - 1)] = mPositions[i];
    }
  }
  return positions;
}
function getWindingDirection(positions) {
  return Math.sign(getSignedArea(positions));
}
function getSignedArea(positions) {
  let area = 0;
  const nCoords = positions.length / 2 - 1;
  for (let i = 0; i < nCoords; i++) {
    area += (positions[i * 2] + positions[(i + 1) * 2]) * (positions[i * 2 + 1] - positions[(i + 1) * 2 + 1]);
  }
  return area / 2;
}

// dist/lib/parsers/parse-shp.js
var LITTLE_ENDIAN3 = true;
var BIG_ENDIAN2 = false;
var SHP_HEADER_SIZE = 100;
var SHP_RECORD_HEADER_SIZE = 12;
var STATE = {
  EXPECTING_HEADER: 0,
  EXPECTING_RECORD: 1,
  END: 2,
  ERROR: 3
};
var SHPParser = class {
  options = {};
  binaryReader = new BinaryChunkReader({ maxRewindBytes: SHP_RECORD_HEADER_SIZE });
  state = STATE.EXPECTING_HEADER;
  result = {
    geometries: [],
    // Initialize with number values to make TS happy
    // These are initialized for real in STATE.EXPECTING_HEADER
    progress: {
      bytesTotal: NaN,
      bytesUsed: NaN,
      rows: NaN
    },
    currentIndex: NaN
  };
  constructor(options) {
    this.options = options;
  }
  write(arrayBuffer) {
    this.binaryReader.write(arrayBuffer);
    this.state = parseState(this.state, this.result, this.binaryReader, this.options);
  }
  end() {
    this.binaryReader.end();
    this.state = parseState(this.state, this.result, this.binaryReader, this.options);
    if (this.state !== STATE.END) {
      this.state = STATE.ERROR;
      this.result.error = "SHP incomplete file";
    }
  }
};
function parseSHP(arrayBuffer, options) {
  const shpParser = new SHPParser(options);
  shpParser.write(arrayBuffer);
  shpParser.end();
  return shpParser.result;
}
async function* parseSHPInBatches(asyncIterator, options) {
  const parser = new SHPParser(options);
  let headerReturned = false;
  for await (const arrayBuffer of asyncIterator) {
    parser.write(arrayBuffer);
    if (!headerReturned && parser.result.header) {
      headerReturned = true;
      yield parser.result.header;
    }
    if (parser.result.geometries.length > 0) {
      yield parser.result.geometries;
      parser.result.geometries = [];
    }
  }
  parser.end();
  if (parser.result.geometries.length > 0) {
    yield parser.result.geometries;
  }
  return;
}
function parseState(state, result, binaryReader, options) {
  var _a;
  while (true) {
    try {
      switch (state) {
        case STATE.ERROR:
        case STATE.END:
          return state;
        case STATE.EXPECTING_HEADER:
          const dataView = binaryReader.getDataView(SHP_HEADER_SIZE);
          if (!dataView) {
            return state;
          }
          result.header = parseSHPHeader(dataView);
          result.progress = {
            bytesUsed: 0,
            bytesTotal: result.header.length,
            rows: 0
          };
          result.currentIndex = 1;
          state = STATE.EXPECTING_RECORD;
          break;
        case STATE.EXPECTING_RECORD:
          while (binaryReader.hasAvailableBytes(SHP_RECORD_HEADER_SIZE)) {
            const recordHeaderView = binaryReader.getDataView(SHP_RECORD_HEADER_SIZE);
            const recordHeader = {
              recordNumber: recordHeaderView.getInt32(0, BIG_ENDIAN2),
              // 2 byte words; includes the four words of record header
              byteLength: recordHeaderView.getInt32(4, BIG_ENDIAN2) * 2,
              // This is actually part of the record, not the header...
              type: recordHeaderView.getInt32(8, LITTLE_ENDIAN3)
            };
            if (!binaryReader.hasAvailableBytes(recordHeader.byteLength - 4)) {
              binaryReader.rewind(SHP_RECORD_HEADER_SIZE);
              return state;
            }
            const invalidRecord = recordHeader.byteLength < 4 || recordHeader.type !== ((_a = result.header) == null ? void 0 : _a.type) || recordHeader.recordNumber !== result.currentIndex;
            if (invalidRecord) {
              binaryReader.rewind(SHP_RECORD_HEADER_SIZE - 4);
            } else {
              binaryReader.rewind(4);
              const recordView = binaryReader.getDataView(recordHeader.byteLength);
              const geometry = parseRecord(recordView, options);
              result.geometries.push(geometry);
              result.currentIndex++;
              result.progress.rows = result.currentIndex - 1;
            }
          }
          if (binaryReader.ended) {
            state = STATE.END;
          }
          return state;
        default:
          state = STATE.ERROR;
          result.error = `illegal parser state ${state}`;
          return state;
      }
    } catch (error) {
      state = STATE.ERROR;
      result.error = `SHP parsing failed: ${error == null ? void 0 : error.message}`;
      return state;
    }
  }
}

// dist/shp-loader.js
var VERSION = true ? "4.3.3" : "latest";
var SHP_MAGIC_NUMBER2 = [0, 0, 39, 10];
var SHPWorkerLoader = {
  dataType: null,
  batchType: null,
  name: "SHP",
  id: "shp",
  module: "shapefile",
  version: VERSION,
  worker: true,
  category: "geometry",
  extensions: ["shp"],
  mimeTypes: ["application/octet-stream"],
  // ISSUE: This also identifies SHX files, which are identical to SHP for the first 100 bytes...
  tests: [new Uint8Array(SHP_MAGIC_NUMBER2).buffer],
  options: {
    shp: {
      _maxDimensions: 4
    }
  }
};
var SHPLoader = {
  ...SHPWorkerLoader,
  parse: async (arrayBuffer, options) => parseSHP(arrayBuffer, options),
  parseSync: parseSHP,
  parseInBatches: (arrayBufferIterator, options) => parseSHPInBatches(arrayBufferIterator, options)
};

// dist/lib/parsers/parse-shapefile.js
var import_loader_utils = require("@loaders.gl/loader-utils");
var import_gis = require("@loaders.gl/gis");
var import_proj4 = require("@math.gl/proj4");

// dist/lib/parsers/parse-shx.js
var SHX_HEADER_SIZE = 100;
var BIG_ENDIAN3 = false;
function parseShx(arrayBuffer) {
  const headerView = new DataView(arrayBuffer, 0, SHX_HEADER_SIZE);
  const header = parseSHPHeader(headerView);
  const contentLength = header.length - SHX_HEADER_SIZE;
  const contentView = new DataView(arrayBuffer, SHX_HEADER_SIZE, contentLength);
  const offsets = new Int32Array(contentLength);
  const lengths = new Int32Array(contentLength);
  for (let i = 0; i < contentLength / 8; i++) {
    offsets[i] = contentView.getInt32(i * 8, BIG_ENDIAN3);
    lengths[i] = contentView.getInt32(i * 8 + 4, BIG_ENDIAN3);
  }
  return {
    offsets,
    lengths
  };
}

// dist/lib/streaming/zip-batch-iterators.js
async function* zipBatchIterators(iterator1, iterator2, shape) {
  const batch1Data = [];
  const batch2Data = [];
  let iterator1Done = false;
  let iterator2Done = false;
  while (!iterator1Done && !iterator2Done) {
    if (batch1Data.length === 0 && !iterator1Done) {
      const { value, done } = await iterator1.next();
      if (done) {
        iterator1Done = true;
      } else {
        batch1Data.push(...value);
      }
    }
    if (batch2Data.length === 0 && !iterator2Done) {
      const { value, done } = await iterator2.next();
      if (done) {
        iterator2Done = true;
      } else {
        batch2Data.push(...value);
      }
    }
    const batchData = extractBatchData(batch1Data, batch2Data);
    if (batchData) {
      yield {
        batchType: "data",
        shape,
        length: batchData.length,
        data: batchData
      };
    }
  }
}
function extractBatchData(batch1, batch2) {
  const batchLength = Math.min(batch1.length, batch2.length);
  if (batchLength === 0) {
    return null;
  }
  const batch = [batch1.slice(0, batchLength), batch2.slice(0, batchLength)];
  batch1.splice(0, batchLength);
  batch2.splice(0, batchLength);
  return batch;
}

// dist/lib/parsers/parse-dbf.js
var LITTLE_ENDIAN4 = true;
var DBF_HEADER_SIZE = 32;
var STATE2;
(function(STATE3) {
  STATE3[STATE3["START"] = 0] = "START";
  STATE3[STATE3["FIELD_DESCRIPTORS"] = 1] = "FIELD_DESCRIPTORS";
  STATE3[STATE3["FIELD_PROPERTIES"] = 2] = "FIELD_PROPERTIES";
  STATE3[STATE3["END"] = 3] = "END";
  STATE3[STATE3["ERROR"] = 4] = "ERROR";
})(STATE2 || (STATE2 = {}));
var DBFParser = class {
  binaryReader = new BinaryChunkReader();
  textDecoder;
  state = STATE2.START;
  result = {
    data: []
  };
  constructor(options) {
    this.textDecoder = new TextDecoder(options.encoding);
  }
  /**
   * @param arrayBuffer
   */
  write(arrayBuffer) {
    this.binaryReader.write(arrayBuffer);
    this.state = parseState2(this.state, this.result, this.binaryReader, this.textDecoder);
  }
  end() {
    this.binaryReader.end();
    this.state = parseState2(this.state, this.result, this.binaryReader, this.textDecoder);
    if (this.state !== STATE2.END) {
      this.state = STATE2.ERROR;
      this.result.error = "DBF incomplete file";
    }
  }
};
function parseDBF(arrayBuffer, options = {}) {
  var _a;
  const { encoding = "latin1" } = options.dbf || {};
  const dbfParser = new DBFParser({ encoding });
  dbfParser.write(arrayBuffer);
  dbfParser.end();
  const { data, schema } = dbfParser.result;
  const shape = (_a = options == null ? void 0 : options.dbf) == null ? void 0 : _a.shape;
  switch (shape) {
    case "object-row-table": {
      const table = {
        shape: "object-row-table",
        schema,
        data
      };
      return table;
    }
    case "table":
      return { schema, rows: data };
    case "rows":
    default:
      return data;
  }
}
async function* parseDBFInBatches(asyncIterator, options = {}) {
  const { encoding = "latin1" } = options.dbf || {};
  const parser = new DBFParser({ encoding });
  let headerReturned = false;
  for await (const arrayBuffer of asyncIterator) {
    parser.write(arrayBuffer);
    if (!headerReturned && parser.result.dbfHeader) {
      headerReturned = true;
      yield parser.result.dbfHeader;
    }
    if (parser.result.data.length > 0) {
      yield parser.result.data;
      parser.result.data = [];
    }
  }
  parser.end();
  if (parser.result.data.length > 0) {
    yield parser.result.data;
  }
}
function parseState2(state, result, binaryReader, textDecoder) {
  while (true) {
    try {
      switch (state) {
        case STATE2.ERROR:
        case STATE2.END:
          return state;
        case STATE2.START:
          const dataView = binaryReader.getDataView(DBF_HEADER_SIZE);
          if (!dataView) {
            return state;
          }
          result.dbfHeader = parseDBFHeader(dataView);
          result.progress = {
            bytesUsed: 0,
            rowsTotal: result.dbfHeader.nRecords,
            rows: 0
          };
          state = STATE2.FIELD_DESCRIPTORS;
          break;
        case STATE2.FIELD_DESCRIPTORS:
          const fieldDescriptorView = binaryReader.getDataView(
            // @ts-ignore
            result.dbfHeader.headerLength - DBF_HEADER_SIZE
          );
          if (!fieldDescriptorView) {
            return state;
          }
          result.dbfFields = parseFieldDescriptors(fieldDescriptorView, textDecoder);
          result.schema = {
            fields: result.dbfFields.map((dbfField) => makeField(dbfField)),
            metadata: {}
          };
          state = STATE2.FIELD_PROPERTIES;
          binaryReader.skip(1);
          break;
        case STATE2.FIELD_PROPERTIES:
          const { recordLength = 0, nRecords = 0 } = (result == null ? void 0 : result.dbfHeader) || {};
          while (result.data.length < nRecords) {
            const recordView = binaryReader.getDataView(recordLength - 1);
            if (!recordView) {
              return state;
            }
            binaryReader.skip(1);
            const row = parseRow(recordView, result.dbfFields, textDecoder);
            result.data.push(row);
            result.progress.rows = result.data.length;
          }
          state = STATE2.END;
          break;
        default:
          state = STATE2.ERROR;
          result.error = `illegal parser state ${state}`;
          return state;
      }
    } catch (error) {
      state = STATE2.ERROR;
      result.error = `DBF parsing failed: ${error.message}`;
      return state;
    }
  }
}
function parseDBFHeader(headerView) {
  return {
    // Last updated date
    year: headerView.getUint8(1) + 1900,
    month: headerView.getUint8(2),
    day: headerView.getUint8(3),
    // Number of records in data file
    nRecords: headerView.getUint32(4, LITTLE_ENDIAN4),
    // Length of header in bytes
    headerLength: headerView.getUint16(8, LITTLE_ENDIAN4),
    // Length of each record
    recordLength: headerView.getUint16(10, LITTLE_ENDIAN4),
    // Not sure if this is usually set
    languageDriver: headerView.getUint8(29)
  };
}
function parseFieldDescriptors(view, textDecoder) {
  const nFields = (view.byteLength - 1) / 32;
  const fields = [];
  let offset = 0;
  for (let i = 0; i < nFields; i++) {
    const name = textDecoder.decode(new Uint8Array(view.buffer, view.byteOffset + offset, 11)).replace(/\u0000/g, "");
    fields.push({
      name,
      dataType: String.fromCharCode(view.getUint8(offset + 11)),
      fieldLength: view.getUint8(offset + 16),
      decimal: view.getUint8(offset + 17)
    });
    offset += 32;
  }
  return fields;
}
function parseRow(view, fields, textDecoder) {
  const out = {};
  let offset = 0;
  for (const field of fields) {
    const text = textDecoder.decode(new Uint8Array(view.buffer, view.byteOffset + offset, field.fieldLength));
    out[field.name] = parseField(text, field.dataType);
    offset += field.fieldLength;
  }
  return out;
}
function parseField(text, dataType) {
  switch (dataType) {
    case "B":
      return parseNumber(text);
    case "C":
      return parseCharacter(text);
    case "F":
      return parseNumber(text);
    case "N":
      return parseNumber(text);
    case "O":
      return parseNumber(text);
    case "D":
      return parseDate(text);
    case "L":
      return parseBoolean(text);
    default:
      throw new Error("Unsupported data type");
  }
}
function parseDate(str) {
  return Date.UTC(str.slice(0, 4), parseInt(str.slice(4, 6), 10) - 1, str.slice(6, 8));
}
function parseBoolean(value) {
  return /^[nf]$/i.test(value) ? false : /^[yt]$/i.test(value) ? true : null;
}
function parseNumber(text) {
  const number = parseFloat(text);
  return isNaN(number) ? null : number;
}
function parseCharacter(text) {
  return text.trim() || null;
}
function makeField({ name, dataType, fieldLength, decimal }) {
  switch (dataType) {
    case "B":
      return { name, type: "float64", nullable: true, metadata: {} };
    case "C":
      return { name, type: "utf8", nullable: true, metadata: {} };
    case "F":
      return { name, type: "float64", nullable: true, metadata: {} };
    case "N":
      return { name, type: "float64", nullable: true, metadata: {} };
    case "O":
      return { name, type: "float64", nullable: true, metadata: {} };
    case "D":
      return { name, type: "timestamp-millisecond", nullable: true, metadata: {} };
    case "L":
      return { name, type: "bool", nullable: true, metadata: {} };
    default:
      throw new Error("Unsupported data type");
  }
}

// dist/dbf-loader.js
var VERSION2 = true ? "4.3.3" : "latest";
var DBFWorkerLoader = {
  name: "DBF",
  dataType: null,
  batchType: null,
  id: "dbf",
  module: "shapefile",
  version: VERSION2,
  worker: true,
  category: "table",
  extensions: ["dbf"],
  mimeTypes: ["application/x-dbf"],
  options: {
    dbf: {
      encoding: "latin1"
    }
  }
};
var DBFLoader = {
  ...DBFWorkerLoader,
  parse: async (arrayBuffer, options) => parseDBF(arrayBuffer, options),
  parseSync: parseDBF,
  parseInBatches(arrayBufferIterator, options) {
    return parseDBFInBatches(arrayBufferIterator, options);
  }
};

// dist/lib/parsers/parse-shapefile.js
async function* parseShapefileInBatches(asyncIterator, options, context) {
  var _a, _b, _c;
  const { reproject = false, _targetCrs = "WGS84" } = (options == null ? void 0 : options.gis) || {};
  const { shx, cpg, prj } = await loadShapefileSidecarFiles(options, context);
  const shapeIterable = await (0, import_loader_utils.parseInBatchesFromContext)(asyncIterator, SHPLoader, options, context);
  const shapeIterator = ((_a = shapeIterable[Symbol.asyncIterator]) == null ? void 0 : _a.call(shapeIterable)) || ((_b = shapeIterable[Symbol.iterator]) == null ? void 0 : _b.call(shapeIterable));
  let propertyIterator = null;
  const dbfResponse = await (context == null ? void 0 : context.fetch(replaceExtension((context == null ? void 0 : context.url) || "", "dbf")));
  if (dbfResponse == null ? void 0 : dbfResponse.ok) {
    const propertyIterable = await (0, import_loader_utils.parseInBatchesFromContext)(dbfResponse, DBFLoader, {
      ...options,
      dbf: { encoding: cpg || "latin1" }
    }, context);
    propertyIterator = ((_c = propertyIterable[Symbol.asyncIterator]) == null ? void 0 : _c.call(propertyIterable)) || propertyIterable[Symbol.iterator]();
  }
  let shapeHeader = (await shapeIterator.next()).value;
  if (shapeHeader && shapeHeader.batchType === "metadata") {
    shapeHeader = (await shapeIterator.next()).value;
  }
  let dbfHeader = {};
  if (propertyIterator) {
    dbfHeader = (await propertyIterator.next()).value;
    if (dbfHeader && dbfHeader.batchType === "metadata") {
      dbfHeader = (await propertyIterator.next()).value;
    }
  }
  const zippedIterator = propertyIterator ? zipBatchIterators(shapeIterator, propertyIterator, "object-row-table") : shapeIterator;
  const zippedBatchIterable = {
    [Symbol.asyncIterator]() {
      return zippedIterator;
    }
  };
  for await (const batch of zippedBatchIterable) {
    let geometries;
    let properties;
    if (!propertyIterator) {
      geometries = batch;
    } else {
      [geometries, properties] = batch.data;
    }
    const geojsonGeometries = parseGeometries(geometries);
    let features = joinProperties(geojsonGeometries, properties);
    if (reproject) {
      features = reprojectFeatures(features, prj, _targetCrs);
    }
    yield {
      encoding: cpg,
      prj,
      shx,
      header: shapeHeader,
      data: features
    };
  }
}
async function parseShapefile(arrayBuffer, options, context) {
  var _a;
  const { reproject = false, _targetCrs = "WGS84" } = (options == null ? void 0 : options.gis) || {};
  const { shx, cpg, prj } = await loadShapefileSidecarFiles(options, context);
  const { header, geometries } = await (0, import_loader_utils.parseFromContext)(arrayBuffer, SHPLoader, options, context);
  const geojsonGeometries = parseGeometries(geometries);
  let propertyTable;
  const dbfResponse = await (context == null ? void 0 : context.fetch(replaceExtension(context == null ? void 0 : context.url, "dbf")));
  if (dbfResponse == null ? void 0 : dbfResponse.ok) {
    propertyTable = await (0, import_loader_utils.parseFromContext)(dbfResponse, DBFLoader, { dbf: { shape: "object-row-table", encoding: cpg || "latin1" } }, context);
  }
  let features = joinProperties(geojsonGeometries, (propertyTable == null ? void 0 : propertyTable.data) || []);
  if (reproject) {
    features = reprojectFeatures(features, prj, _targetCrs);
  }
  switch ((_a = options == null ? void 0 : options.shapefile) == null ? void 0 : _a.shape) {
    case "geojson-table":
      return {
        // @ts-expect-error
        shape: "geojson-table",
        type: "FeatureCollection",
        encoding: cpg,
        schema: (propertyTable == null ? void 0 : propertyTable.schema) || { metadata: {}, fields: [] },
        prj,
        shx,
        header,
        features
      };
    default:
      return {
        encoding: cpg,
        prj,
        shx,
        header,
        data: features
      };
  }
}
function parseGeometries(geometries) {
  const geojsonGeometries = [];
  for (const geom of geometries) {
    geojsonGeometries.push((0, import_gis.binaryToGeometry)(geom));
  }
  return geojsonGeometries;
}
function joinProperties(geometries, properties) {
  const features = [];
  for (let i = 0; i < geometries.length; i++) {
    const geometry = geometries[i];
    const feature = {
      type: "Feature",
      geometry,
      // properties can be undefined if dbfResponse above was empty
      properties: properties && properties[i] || {}
    };
    features.push(feature);
  }
  return features;
}
function reprojectFeatures(features, sourceCrs, targetCrs) {
  if (!sourceCrs && !targetCrs) {
    return features;
  }
  const projection = new import_proj4.Proj4Projection({ from: sourceCrs || "WGS84", to: targetCrs || "WGS84" });
  return (0, import_gis.transformGeoJsonCoords)(features, (coord) => projection.project(coord));
}
async function loadShapefileSidecarFiles(options, context) {
  const { url, fetch } = context;
  const shxPromise = fetch(replaceExtension(url, "shx"));
  const cpgPromise = fetch(replaceExtension(url, "cpg"));
  const prjPromise = fetch(replaceExtension(url, "prj"));
  await Promise.all([shxPromise, cpgPromise, prjPromise]);
  let shx;
  let cpg;
  let prj;
  const shxResponse = await shxPromise;
  if (shxResponse.ok) {
    const arrayBuffer = await shxResponse.arrayBuffer();
    shx = parseShx(arrayBuffer);
  }
  const cpgResponse = await cpgPromise;
  if (cpgResponse.ok) {
    cpg = await cpgResponse.text();
  }
  const prjResponse = await prjPromise;
  if (prjResponse.ok) {
    prj = await prjResponse.text();
  }
  return {
    shx,
    cpg,
    prj
  };
}
function replaceExtension(url, newExtension) {
  const baseName = basename(url);
  const extension = extname(url);
  const isUpperCase = extension === extension.toUpperCase();
  if (isUpperCase) {
    newExtension = newExtension.toUpperCase();
  }
  return `${baseName}.${newExtension}`;
}
function basename(url) {
  const extIndex = url && url.lastIndexOf(".");
  if (typeof extIndex === "number") {
    return extIndex >= 0 ? url.substr(0, extIndex) : "";
  }
  return extIndex;
}
function extname(url) {
  const extIndex = url && url.lastIndexOf(".");
  if (typeof extIndex === "number") {
    return extIndex >= 0 ? url.substr(extIndex + 1) : "";
  }
  return extIndex;
}

// dist/shapefile-loader.js
var VERSION3 = true ? "4.3.3" : "latest";
var ShapefileLoader = {
  name: "Shapefile",
  id: "shapefile",
  module: "shapefile",
  version: VERSION3,
  category: "geometry",
  extensions: ["shp"],
  mimeTypes: ["application/octet-stream"],
  tests: [new Uint8Array(SHP_MAGIC_NUMBER2).buffer],
  options: {
    shapefile: {
      shape: "v3"
    },
    shp: {
      _maxDimensions: 4
    }
  },
  // @ts-expect-error
  parse: parseShapefile,
  // @ts-expect-error
  parseInBatches: parseShapefileInBatches
};

// dist/lib/streaming/binary-reader.js
var BinaryReader = class {
  offset;
  arrayBuffer;
  constructor(arrayBuffer) {
    this.offset = 0;
    this.arrayBuffer = arrayBuffer;
  }
  /**
   * Checks if there are available bytes in data
   *
   * @param bytes
   * @returns boolean
   */
  hasAvailableBytes(bytes) {
    return this.arrayBuffer.byteLength - this.offset >= bytes;
  }
  /**
   * Get the required number of bytes from the iterator
   *
   * @param bytes
   * @returns Dataview
   */
  getDataView(bytes) {
    if (bytes && !this.hasAvailableBytes(bytes)) {
      throw new Error("binary data exhausted");
    }
    const dataView = bytes ? new DataView(this.arrayBuffer, this.offset, bytes) : new DataView(this.arrayBuffer, this.offset);
    this.offset += bytes;
    return dataView;
  }
  /**
   * Skipping
   *
   * @param bytes
   */
  skip(bytes) {
    this.offset += bytes;
  }
  /**
   * Rewinding
   *
   * @param bytes
   */
  rewind(bytes) {
    this.offset -= bytes;
  }
};
//# sourceMappingURL=index.cjs.map