@iotize/ionic/esm2022/lib/tap-scanner/tap-scanner-ble/manufacturer-data-filter.mjs

Iotize specific building blocks on top of @ionic/angular.

export function checkManufacturerDataMatch(parsedScanRecors, manufacturerDataFilters) {
    const companyIdentifierRecords = parsedScanRecors.filter((record) => {
        return record.type === 0xff && record.data.length >= 2;
    });
    if (companyIdentifierRecords.length === 0) {
        return false;
    }
    else if (companyIdentifierRecords.length > 1) {
        console.warn(`Multiple company identifier record found. Only using the first one`);
    }
    const manufacturerDataRecord = companyIdentifierRecords[0];
    const recordCompanyIdentifierId = _toUint16(manufacturerDataRecord.data);
    return !!manufacturerDataFilters.find((manufacturerDataFilter) => {
        const filterManufacturerId = _toUint16(manufacturerDataFilter.companyIdentifier);
        if (filterManufacturerId !== recordCompanyIdentifierId) {
            return false;
        }
        if (manufacturerDataFilter.dataPrefix) {
            return checkManufacturerDataPrefix(manufacturerDataRecord.data.subarray(2), manufacturerDataFilter.dataPrefix, manufacturerDataFilter.mask);
        }
        return true;
    });
}
export function parseScanRecords(scanRecord) {
    const records = [];
    if (!scanRecord?.length) {
        return records;
    }
    let index = 0;
    const arrayScanRecord = Uint8Array.from(scanRecord);
    while (index < arrayScanRecord.length) {
        const length = arrayScanRecord[index++];
        //Done once we run out of records
        if (length == 0)
            break;
        const type = arrayScanRecord[index++];
        //Done if our record isn't a valid type
        if (type == 0)
            break;
        const dataLength = length - 1;
        const data = Uint8Array.from(arrayScanRecord.slice(index, index + dataLength));
        index += dataLength;
        records.push({
            data,
            length,
            type,
        });
    }
    return records;
}
function checkManufacturerDataPrefix(data, dataPrefix, mask) {
    const subData = Uint8Array.from(data).subarray(0, dataPrefix.length);
    if (mask) {
        for (let bytePosition = 0; bytePosition < dataPrefix.length; bytePosition++) {
            const dataByte = data[bytePosition];
            const dataPrefixByte = dataPrefix[bytePosition];
            const maskByte = mask[bytePosition];
            if (maskByte) {
                for (let bitPosition = 0; bitPosition < 8; bitPosition++) {
                    const mask = 1 << (7 - bitPosition);
                    if ((maskByte & mask) === 0) {
                        // If mask bit is not set, we don't need to check this bit
                        continue;
                    }
                    if ((dataByte & mask) !== (dataPrefixByte & mask)) {
                        return false;
                    }
                }
            }
        }
        return true;
    }
    else {
        return arrayEquals(subData, dataPrefix);
    }
}
function arrayEquals(arg0, dataPrefix) {
    return (arg0.length === dataPrefix.length &&
        arg0.every((v, index) => v === dataPrefix[index]));
}
function _toUint16(data) {
    if (!data) {
        return 0;
    }
    else if (typeof data === 'number') {
        return data;
    }
    else {
        const uint8Array = Uint8Array.from(data);
        return (uint8Array[0] << 8) + uint8Array[1];
    }
}
//# sourceMappingURL=data:application/json;base64,{"version":3,"file":"manufacturer-data-filter.js","sourceRoot":"","sources":["../../../../../../../projects/iotize-ionic/src/lib/tap-scanner/tap-scanner-ble/manufacturer-data-filter.ts"],"names":[],"mappings":"AAYA,MAAM,UAAU,0BAA0B,CACxC,gBAA8B,EAC9B,uBAA6D;IAE7D,MAAM,wBAAwB,GAAG,gBAAgB,CAAC,MAAM,CAAC,CAAC,MAAM,EAAE,EAAE;QAClE,OAAO,MAAM,CAAC,IAAI,KAAK,IAAI,IAAI,MAAM,CAAC,IAAI,CAAC,MAAM,IAAI,CAAC,CAAC;IACzD,CAAC,CAAC,CAAC;IACH,IAAI,wBAAwB,CAAC,MAAM,KAAK,CAAC,EAAE,CAAC;QAC1C,OAAO,KAAK,CAAC;IACf,CAAC;SAAM,IAAI,wBAAwB,CAAC,MAAM,GAAG,CAAC,EAAE,CAAC;QAC/C,OAAO,CAAC,IAAI,CACV,oEAAoE,CACrE,CAAC;IACJ,CAAC;IACD,MAAM,sBAAsB,GAAG,wBAAwB,CAAC,CAAC,CAAC,CAAC;IAC3D,MAAM,yBAAyB,GAAG,SAAS,CAAC,sBAAsB,CAAC,IAAI,CAAC,CAAC;IACzE,OAAO,CAAC,CAAC,uBAAuB,CAAC,IAAI,CAAC,CAAC,sBAAsB,EAAE,EAAE;QAC/D,MAAM,oBAAoB,GAAG,SAAS,CACpC,sBAAsB,CAAC,iBAAiB,CACzC,CAAC;QACF,IAAI,oBAAoB,KAAK,yBAAyB,EAAE,CAAC;YACvD,OAAO,KAAK,CAAC;QACf,CAAC;QACD,IAAI,sBAAsB,CAAC,UAAU,EAAE,CAAC;YACtC,OAAO,2BAA2B,CAChC,sBAAsB,CAAC,IAAI,CAAC,QAAQ,CAAC,CAAC,CAAC,EACvC,sBAAsB,CAAC,UAAU,EACjC,sBAAsB,CAAC,IAAI,CAC5B,CAAC;QACJ,CAAC;QACD,OAAO,IAAI,CAAC;IACd,CAAC,CAAC,CAAC;AACL,CAAC;AAED,MAAM,UAAU,gBAAgB,CAC9B,UAAsD;IAEtD,MAAM,OAAO,GAAiB,EAAE,CAAC;IACjC,IAAI,CAAC,UAAU,EAAE,MAAM,EAAE,CAAC;QACxB,OAAO,OAAO,CAAC;IACjB,CAAC;IACD,IAAI,KAAK,GAAG,CAAC,CAAC;IACd,MAAM,eAAe,GAAG,UAAU,CAAC,IAAI,CAAC,UAAU,CAAC,CAAC;IACpD,OAAO,KAAK,GAAG,eAAe,CAAC,MAAM,EAAE,CAAC;QACtC,MAAM,MAAM,GAAG,eAAe,CAAC,KAAK,EAAE,CAAC,CAAC;QACxC,iCAAiC;QACjC,IAAI,MAAM,IAAI,CAAC;YAAE,MAAM;QAEvB,MAAM,IAAI,GAAG,eAAe,CAAC,KAAK,EAAE,CAAC,CAAC;QACtC,uCAAuC;QACvC,IAAI,IAAI,IAAI,CAAC;YAAE,MAAM;QAErB,MAAM,UAAU,GAAG,MAAM,GAAG,CAAC,CAAC;QAC9B,MAAM,IAAI,GAAG,UAAU,CAAC,IAAI,CAC1B,eAAe,CAAC,KAAK,CAAC,KAAK,EAAE,KAAK,GAAG,UAAU,CAAC,CACjD,CAAC;QACF,KAAK,IAAI,UAAU,CAAC;QAEpB,OAAO,CAAC,IAAI,CAAC;YACX,IAAI;YACJ,MAAM;YACN,IAAI;SACL,CAAC,CAAC;IACL,CAAC;IAED,OAAO,OAAO,CAAC;AACjB,CAAC;AAED,SAAS,2BAA2B,CAClC,IAA2B,EAC3B,UAAiC,EACjC,IAAuC;IAEvC,MAAM,OAAO,GAAG,UAAU,CAAC,IAAI,CAAC,IAAI,CAAC,CAAC,QAAQ,CAAC,CAAC,EAAE,UAAU,CAAC,MAAM,CAAC,CAAC;IACrE,IAAI,IAAI,EAAE,CAAC;QACT,KACE,IAAI,YAAY,GAAG,CAAC,EACpB,YAAY,GAAG,UAAU,CAAC,MAAM,EAChC,YAAY,EAAE,EACd,CAAC;YACD,MAAM,QAAQ,GAAG,IAAI,CAAC,YAAY,CAAC,CAAC;YACpC,MAAM,cAAc,GAAG,UAAU,CAAC,YAAY,CAAC,CAAC;YAChD,MAAM,QAAQ,GAAG,IAAI,CAAC,YAAY,CAAC,CAAC;YACpC,IAAI,QAAQ,EAAE,CAAC;gBACb,KAAK,IAAI,WAAW,GAAG,CAAC,EAAE,WAAW,GAAG,CAAC,EAAE,WAAW,EAAE,EAAE,CAAC;oBACzD,MAAM,IAAI,GAAG,CAAC,IAAI,CAAC,CAAC,GAAG,WAAW,CAAC,CAAC;oBACpC,IAAI,CAAC,QAAQ,GAAG,IAAI,CAAC,KAAK,CAAC,EAAE,CAAC;wBAC5B,0DAA0D;wBAC1D,SAAS;oBACX,CAAC;oBACD,IAAI,CAAC,QAAQ,GAAG,IAAI,CAAC,KAAK,CAAC,cAAc,GAAG,IAAI,CAAC,EAAE,CAAC;wBAClD,OAAO,KAAK,CAAC;oBACf,CAAC;gBACH,CAAC;YACH,CAAC;QACH,CAAC;QACD,OAAO,IAAI,CAAC;IACd,CAAC;SAAM,CAAC;QACN,OAAO,WAAW,CAAC,OAAO,EAAE,UAAU,CAAC,CAAC;IAC1C,CAAC;AACH,CAAC;AAED,SAAS,WAAW,CAClB,IAA2B,EAC3B,UAAiC;IAEjC,OAAO,CACL,IAAI,CAAC,MAAM,KAAK,UAAU,CAAC,MAAM;QACjC,IAAI,CAAC,KAAK,CAAC,CAAC,CAAC,EAAE,KAAK,EAAE,EAAE,CAAC,CAAC,KAAK,UAAU,CAAC,KAAK,CAAC,CAAC,CAClD,CAAC;AACJ,CAAC;AAED,SAAS,SAAS,CAAC,IAAgD;IACjE,IAAI,CAAC,IAAI,EAAE,CAAC;QACV,OAAO,CAAC,CAAC;IACX,CAAC;SAAM,IAAI,OAAO,IAAI,KAAK,QAAQ,EAAE,CAAC;QACpC,OAAO,IAAI,CAAC;IACd,CAAC;SAAM,CAAC;QACN,MAAM,UAAU,GAAG,UAAU,CAAC,IAAI,CAAC,IAAI,CAAC,CAAC;QACzC,OAAO,CAAC,UAAU,CAAC,CAAC,CAAC,IAAI,CAAC,CAAC,GAAG,UAAU,CAAC,CAAC,CAAC,CAAC;IAC9C,CAAC;AACH,CAAC","sourcesContent":["export interface ScanRecord {\n  length: number;\n  type: number;\n  data: Uint8Array;\n}\n\nexport interface WebBluetoothManufacturerDataFilter {\n  companyIdentifier?: number | Uint8Array | number[];\n  dataPrefix?: Uint8Array | number[];\n  mask?: Uint8Array | number[];\n}\n\nexport function checkManufacturerDataMatch(\n  parsedScanRecors: ScanRecord[],\n  manufacturerDataFilters: WebBluetoothManufacturerDataFilter[]\n): boolean {\n  const companyIdentifierRecords = parsedScanRecors.filter((record) => {\n    return record.type === 0xff && record.data.length >= 2;\n  });\n  if (companyIdentifierRecords.length === 0) {\n    return false;\n  } else if (companyIdentifierRecords.length > 1) {\n    console.warn(\n      `Multiple company identifier record found. Only using the first one`\n    );\n  }\n  const manufacturerDataRecord = companyIdentifierRecords[0];\n  const recordCompanyIdentifierId = _toUint16(manufacturerDataRecord.data);\n  return !!manufacturerDataFilters.find((manufacturerDataFilter) => {\n    const filterManufacturerId = _toUint16(\n      manufacturerDataFilter.companyIdentifier\n    );\n    if (filterManufacturerId !== recordCompanyIdentifierId) {\n      return false;\n    }\n    if (manufacturerDataFilter.dataPrefix) {\n      return checkManufacturerDataPrefix(\n        manufacturerDataRecord.data.subarray(2),\n        manufacturerDataFilter.dataPrefix,\n        manufacturerDataFilter.mask\n      );\n    }\n    return true;\n  });\n}\n\nexport function parseScanRecords(\n  scanRecord: number[] | Buffer | Uint8Array | undefined\n): ScanRecord[] {\n  const records: ScanRecord[] = [];\n  if (!scanRecord?.length) {\n    return records;\n  }\n  let index = 0;\n  const arrayScanRecord = Uint8Array.from(scanRecord);\n  while (index < arrayScanRecord.length) {\n    const length = arrayScanRecord[index++];\n    //Done once we run out of records\n    if (length == 0) break;\n\n    const type = arrayScanRecord[index++];\n    //Done if our record isn't a valid type\n    if (type == 0) break;\n\n    const dataLength = length - 1;\n    const data = Uint8Array.from(\n      arrayScanRecord.slice(index, index + dataLength)\n    );\n    index += dataLength;\n\n    records.push({\n      data,\n      length,\n      type,\n    });\n  }\n\n  return records;\n}\n\nfunction checkManufacturerDataPrefix(\n  data: Uint8Array | number[],\n  dataPrefix: Uint8Array | number[],\n  mask: Uint8Array | number[] | undefined\n): boolean {\n  const subData = Uint8Array.from(data).subarray(0, dataPrefix.length);\n  if (mask) {\n    for (\n      let bytePosition = 0;\n      bytePosition < dataPrefix.length;\n      bytePosition++\n    ) {\n      const dataByte = data[bytePosition];\n      const dataPrefixByte = dataPrefix[bytePosition];\n      const maskByte = mask[bytePosition];\n      if (maskByte) {\n        for (let bitPosition = 0; bitPosition < 8; bitPosition++) {\n          const mask = 1 << (7 - bitPosition);\n          if ((maskByte & mask) === 0) {\n            // If mask bit is not set, we don't need to check this bit\n            continue;\n          }\n          if ((dataByte & mask) !== (dataPrefixByte & mask)) {\n            return false;\n          }\n        }\n      }\n    }\n    return true;\n  } else {\n    return arrayEquals(subData, dataPrefix);\n  }\n}\n\nfunction arrayEquals(\n  arg0: Uint8Array | number[],\n  dataPrefix: Uint8Array | number[]\n): boolean {\n  return (\n    arg0.length === dataPrefix.length &&\n    arg0.every((v, index) => v === dataPrefix[index])\n  );\n}\n\nfunction _toUint16(data: Uint8Array | number[] | number | undefined) {\n  if (!data) {\n    return 0;\n  } else if (typeof data === 'number') {\n    return data;\n  } else {\n    const uint8Array = Uint8Array.from(data);\n    return (uint8Array[0] << 8) + uint8Array[1];\n  }\n}\n"]}