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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 | 1686x 1686x 1686x 41x 1686x 1410x 276x 270x 47x 223x 149x 74x 57x 17x 17x 276x 276x 6x 270x | import defined from "../Core/defined.js";
import getJsonFromTypedArray from "../Core/getJsonFromTypedArray.js";
import getMagic from "../Core/getMagic.js";
import RuntimeError from "../Core/RuntimeError.js";
import Cesium3DTileContentType from "./Cesium3DTileContentType.js";
/**
* Results of the preprocess3DTileContent() function. This includes the
* {@link Cesium3DTileContentType} and the payload. The payload is either
* binary or JSON depending on the content type.
*
* @typedef {object} PreprocessedContent
* @property {Cesium3DTileContentType} contentType The type of the content
* @property {Uint8Array} [binaryPayload] For binary files, the payload is returned as a typed array with byteOffset of 0
* @property {object} [jsonPayload] For JSON files, the results are returned as a JSON object.
* @private
*/
/**
* Preprocess a {@link Cesium3DTileContent}, to determine the type of content
* and to parse JSON files into objects.
*
* @param {ArrayBuffer} arrayBuffer The raw binary payload
* @return {PreprocessedContent}
* @private
*/
function preprocess3DTileContent(arrayBuffer) {
const uint8Array = new Uint8Array(arrayBuffer);
let contentType = getMagic(uint8Array);
// We use glTF for JSON glTF files. For binary glTF, we rename this
// to glb to disambiguate
if (contentType === "glTF") {
contentType = "glb";
}
if (Cesium3DTileContentType.isBinaryFormat(contentType)) {
return {
// For binary files, the enum value is the magic number
contentType: contentType,
binaryPayload: uint8Array,
};
}
const json = getJsonContent(uint8Array);
if (defined(json.root)) {
// Most likely a tileset JSON
return {
contentType: Cesium3DTileContentType.EXTERNAL_TILESET,
jsonPayload: json,
};
}
if (defined(json.asset)) {
// Most likely a glTF. Tileset JSON also has an "asset" property
// so this check needs to happen second
return {
contentType: Cesium3DTileContentType.GLTF,
jsonPayload: json,
};
}
if (defined(json.tileAvailability)) {
// Most likely a subtree JSON.
return {
contentType: Cesium3DTileContentType.IMPLICIT_SUBTREE_JSON,
jsonPayload: json,
};
}
Eif (defined(json.type)) {
// Most likely a GeoJSON
return {
contentType: Cesium3DTileContentType.GEOJSON,
jsonPayload: json,
};
}
if (defined(json.voxelTable)) {
// Most likely a voxel JSON
return {
contentType: Cesium3DTileContentType.VOXEL_JSON,
jsonPayload: json,
};
}
throw new RuntimeError("Invalid tile content.");
}
function getJsonContent(uint8Array) {
let json;
try {
json = getJsonFromTypedArray(uint8Array);
} catch (error) {
throw new RuntimeError("Invalid tile content.");
}
return json;
}
export default preprocess3DTileContent;
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