planning

node_modules/geotiff/dist-node/compression/lerc.js

@@ -0,0 +1,33 @@
+"use strict";
+var __importDefault = (this && this.__importDefault) || function (mod) {
+    return (mod && mod.__esModule) ? mod : { "default": mod };
+};
+Object.defineProperty(exports, "__esModule", { value: true });
+const pako_1 = require("pako");
+const lerc_1 = __importDefault(require("lerc"));
+const basedecoder_js_1 = __importDefault(require("./basedecoder.js"));
+const globals_js_1 = require("../globals.js");
+class LercDecoder extends basedecoder_js_1.default {
+    constructor(fileDirectory) {
+        super();
+        this.planarConfiguration = typeof fileDirectory.PlanarConfiguration !== 'undefined' ? fileDirectory.PlanarConfiguration : 1;
+        this.samplesPerPixel = typeof fileDirectory.SamplesPerPixel !== 'undefined' ? fileDirectory.SamplesPerPixel : 1;
+        this.addCompression = fileDirectory.LercParameters[globals_js_1.LercParameters.AddCompression];
+    }
+    decodeBlock(buffer) {
+        switch (this.addCompression) {
+            case globals_js_1.LercAddCompression.None:
+                break;
+            case globals_js_1.LercAddCompression.Deflate:
+                buffer = (0, pako_1.inflate)(new Uint8Array(buffer)).buffer; // eslint-disable-line no-param-reassign, prefer-destructuring
+                break;
+            default:
+                throw new Error(`Unsupported LERC additional compression method identifier: ${this.addCompression}`);
+        }
+        const lercResult = lerc_1.default.decode(buffer, { returnPixelInterleavedDims: this.planarConfiguration === 1 });
+        const lercData = lercResult.pixels[0];
+        return lercData.buffer;
+    }
+}
+exports.default = LercDecoder;
+//# sourceMappingURL=lerc.js.map