Add EBCDIC support to inspector

media/editor/dataInspectorProperties.tsx

@@ -177,4 +177,29 @@ addTextDecoder("big5", 2);
 addTextDecoder("iso-2022-kr", 2);
 addTextDecoder("shift-jis", 2);
 
+/** EBCDIC Code Page 037 (IBM US/Canada) to Unicode lookup table (256 entries). */
+const EBCDIC_CP037 =
+	"\u0000\u0001\u0002\u0003\u009C\u0009\u0086\u007F\u0097\u008D\u008E\u000B\u000C\u000D\u000E\u000F" +
+	"\u0010\u0011\u0012\u0013\u009D\u0085\u0008\u0087\u0018\u0019\u0092\u008F\u001C\u001D\u001E\u001F" +
+	"\u0080\u0081\u0082\u0083\u0084\u000A\u0017\u001B\u0088\u0089\u008A\u008B\u008C\u0005\u0006\u0007" +
+	"\u0090\u0091\u0016\u0093\u0094\u0095\u0096\u0004\u0098\u0099\u009A\u009B\u0014\u0015\u009E\u001A" +
+	"\u0020\u00A0\u00E2\u00E4\u00E0\u00E1\u00E3\u00E5\u00E7\u00F1\u00A2\u002E\u003C\u0028\u002B\u007C" +
+	"\u0026\u00E9\u00EA\u00EB\u00E8\u00ED\u00EE\u00EF\u00EC\u00DF\u0021\u0024\u002A\u0029\u003B\u00AC" +
+	"\u002D\u002F\u00C2\u00C4\u00C0\u00C1\u00C3\u00C5\u00C7\u00D1\u00A6\u002C\u0025\u005F\u003E\u003F" +
+	"\u00F8\u00C9\u00CA\u00CB\u00C8\u00CD\u00CE\u00CF\u00CC\u0060\u003A\u0023\u0040\u0027\u003D\u0022" +
+	"\u00D8\u0061\u0062\u0063\u0064\u0065\u0066\u0067\u0068\u0069\u00AB\u00BB\u00F0\u00FD\u00FE\u00B1" +
+	"\u00B0\u006A\u006B\u006C\u006D\u006E\u006F\u0070\u0071\u0072\u00AA\u00BA\u00E6\u00B8\u00C6\u00A4" +
+	"\u00B5\u007E\u0073\u0074\u0075\u0076\u0077\u0078\u0079\u007A\u00A1\u00BF\u00D0\u00DD\u00DE\u00AE" +
+	"\u005E\u00A3\u00A5\u00B7\u00A9\u00A7\u00B6\u00BC\u00BD\u00BE\u005B\u005D\u00AF\u00A8\u00B4\u00D7" +
+	"\u007B\u0041\u0042\u0043\u0044\u0045\u0046\u0047\u0048\u0049\u00AD\u00F4\u00F6\u00F2\u00F3\u00F5" +
+	"\u007D\u004A\u004B\u004C\u004D\u004E\u004F\u0050\u0051\u0052\u00B9\u00FB\u00FC\u00F9\u00FA\u00FF" +
+	"\u005C\u00F7\u0053\u0054\u0055\u0056\u0057\u0058\u0059\u005A\u00B2\u00D4\u00D6\u00D2\u00D3\u00D5" +
+	"\u0030\u0031\u0032\u0033\u0034\u0035\u0036\u0037\u0038\u0039\u00B3\u00DB\u00DC\u00D9\u00DA\u009F";
+
+inspectTypesBuilder.push({
+	label: "EBCDIC",
+	minBytes: 1,
+	convert: dv => EBCDIC_CP037[dv.getUint8(0)],
+});
+
 export const inspectableTypes: readonly IInspectableType[] = inspectTypesBuilder;

src/test/dataInspectorProperties.test.ts

@@ -0,0 +1,33 @@
+/*---------------------------------------------------------
+ * Copyright (C) Microsoft Corporation. All rights reserved.
+ *--------------------------------------------------------*/
+import { expect } from "chai";
+import { inspectableTypes } from "../../media/editor/dataInspectorProperties";
+
+const ebcdic = inspectableTypes.find(t => t.label === "EBCDIC")!;
+
+const dvOf = (byte: number) => new DataView(new Uint8Array([byte]).buffer);
+
+describe("EBCDIC decoding", () => {
+	it("decodes space (0x40)", () => {
+		expect(ebcdic.convert(dvOf(0x40), false)).to.equal(" ");
+	});
+
+	it("decodes digits 0-9 (0xF0-0xF9)", () => {
+		for (let i = 0; i <= 9; i++) {
+			expect(ebcdic.convert(dvOf(0xf0 + i), false)).to.equal(String(i));
+		}
+	});
+
+	it("decodes uppercase A-I (0xC1-0xC9)", () => {
+		for (let i = 0; i < 9; i++) {
+			expect(ebcdic.convert(dvOf(0xc1 + i), false)).to.equal(String.fromCharCode("A".charCodeAt(0) + i));
+		}
+	});
+
+	it("decodes lowercase a-i (0x81-0x89)", () => {
+		for (let i = 0; i < 9; i++) {
+			expect(ebcdic.convert(dvOf(0x81 + i), false)).to.equal(String.fromCharCode("a".charCodeAt(0) + i));
+		}
+	});
+});

src/test/index.ts

@@ -2,6 +2,7 @@ import Mocha from "mocha";
 
 const fileImports = [
 	() => import("./backup.test"),
+	() => import("./dataInspectorProperties.test"),
 	() => import("./hexDocumentModel.test"),
 	() => import("./searchRequest.test"),
 	() => import("./range.test"),