327 lines
12 KiB
TypeScript
327 lines
12 KiB
TypeScript
import { BinaryFontPacker } from "@suaveplan/font-compress";
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import type { TypefaceFont } from "@suaveplan/font-convert";
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import { describe, expect, it } from "@suaveplan/testing/runner";
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import {
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FONT_DECOMPRESS_CODES,
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FontDecompressError,
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} from "../../error-codes/error-codes.js";
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import {
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BinaryFontUnpacker,
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createBinaryFontUnpacker,
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} from "./binary-font-unpacker.js";
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function makeFont(overrides: Partial<TypefaceFont> = {}): TypefaceFont {
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return {
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familyName: "TestFont",
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cssFontWeight: "normal",
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cssFontStyle: "normal",
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reversed: false,
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ascender: 800,
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descender: -200,
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underlinePosition: -100,
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underlineThickness: 50,
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resolution: 1000,
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boundingBox: { yMin: -200, xMin: 0, yMax: 800, xMax: 1000 },
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original_font_information: {},
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glyphs: {
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A: { ha: 600, x_min: 10, x_max: 590, o: "m 0 0 l 100 0 z " },
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},
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...overrides,
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};
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}
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function packFont(font: TypefaceFont): Uint8Array {
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return new BinaryFontPacker().pack(font);
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}
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describe("createBinaryFontUnpacker", () => {
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it("returns a BinaryFontUnpacker instance", { timeout: 5000 }, () => {
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expect(createBinaryFontUnpacker()).toBeInstanceOf(BinaryFontUnpacker);
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});
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});
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describe("BinaryFontUnpacker.unpack — round-trip pack/unpack preserves font shape", () => {
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it("round-trips header and metrics", { timeout: 5000 }, () => {
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const font = makeFont();
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const result = new BinaryFontUnpacker().unpack(packFont(font));
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expect(result.familyName).toBe(font.familyName);
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expect(result.cssFontWeight).toBe(font.cssFontWeight);
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expect(result.cssFontStyle).toBe(font.cssFontStyle);
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expect(result.reversed).toBe(font.reversed);
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expect(result.ascender).toBe(font.ascender);
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expect(result.descender).toBe(font.descender);
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expect(result.underlinePosition).toBe(font.underlinePosition);
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expect(result.underlineThickness).toBe(font.underlineThickness);
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expect(result.resolution).toBe(font.resolution);
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expect(result.boundingBox).toEqual(font.boundingBox);
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});
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it("round-trips reversed=true", { timeout: 5000 }, () => {
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const result = new BinaryFontUnpacker().unpack(
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packFont(makeFont({ reversed: true }))
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);
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expect(result.reversed).toBe(true);
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});
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it("round-trips glyph ha/x_min/x_max", { timeout: 5000 }, () => {
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const result = new BinaryFontUnpacker().unpack(packFont(makeFont()));
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expect(result.glyphs["A"]).toBeDefined();
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expect(result.glyphs["A"]?.ha).toBe(600);
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expect(result.glyphs["A"]?.x_min).toBe(10);
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expect(result.glyphs["A"]?.x_max).toBe(590);
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});
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it("round-trips glyph outline string", { timeout: 5000 }, () => {
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const result = new BinaryFontUnpacker().unpack(packFont(makeFont()));
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expect(result.glyphs["A"]?.o).toBe("m 0 0 l 100 0 z ");
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});
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it("round-trips font with no glyphs", { timeout: 5000 }, () => {
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const result = new BinaryFontUnpacker().unpack(
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packFont(makeFont({ glyphs: {} }))
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);
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expect(Object.keys(result.glyphs)).toHaveLength(0);
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});
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it("round-trips multiple glyphs and all command types", {
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timeout: 5000,
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}, () => {
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const font = makeFont({
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glyphs: {
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A: {
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ha: 600,
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x_min: 0,
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x_max: 600,
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o: "m 0 0 l 100 0 b 10 20 30 40 50 60 q 5 10 15 20 z ",
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},
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B: { ha: 500, x_min: 0, x_max: 500, o: "m 0 0 z " },
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},
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});
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const result = new BinaryFontUnpacker().unpack(packFont(font));
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expect(result.glyphs["A"]?.o).toBe(
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"m 0 0 l 100 0 b 10 20 30 40 50 60 q 5 10 15 20 z "
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);
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expect(result.glyphs["B"]?.o).toBe("m 0 0 z ");
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});
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it("round-trips negative coordinate values", { timeout: 5000 }, () => {
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const font = makeFont({
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glyphs: {
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g: {
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ha: 600,
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x_min: -10,
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x_max: 590,
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o: "m -5 -200 l 100 -100 z ",
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},
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},
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});
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const result = new BinaryFontUnpacker().unpack(packFont(font));
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expect(result.glyphs["g"]?.o).toBe("m -5 -200 l 100 -100 z ");
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});
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it("round-trips unicode character glyphs", { timeout: 5000 }, () => {
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const font = makeFont({
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glyphs: {
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"€": { ha: 700, x_min: 50, x_max: 650, o: "m 0 0 z " },
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},
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});
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const result = new BinaryFontUnpacker().unpack(packFont(font));
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expect(result.glyphs["€"]).toBeDefined();
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expect(result.glyphs["€"]?.ha).toBe(700);
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});
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it("sets original_font_information to empty object", {
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timeout: 5000,
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}, () => {
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const result = new BinaryFontUnpacker().unpack(packFont(makeFont()));
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expect(result.original_font_information).toEqual({});
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});
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});
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describe("BinaryFontUnpacker.unpack — error handling", () => {
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it("truncated buffer raises FontDecompressError", { timeout: 5000 }, () => {
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const unpacker = createBinaryFontUnpacker();
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expect(() => unpacker.unpack(new Uint8Array(3))).toThrow(
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FontDecompressError
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);
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});
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it("empty buffer raises FontDecompressError", { timeout: 5000 }, () => {
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const unpacker = createBinaryFontUnpacker();
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expect(() => unpacker.unpack(new Uint8Array(0))).toThrow(
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FontDecompressError
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);
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});
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it("truncated mid-dictionary raises INVALID_DATA", {
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timeout: 5000,
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}, () => {
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const fullBuf = packFont(makeFont());
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// Find roughly where the dictionary starts: after 3 length-prefixed strings + reversed byte + u32 dictlen.
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// Truncate to a length guaranteed to land inside the dictionary.
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const truncated = fullBuf.subarray(
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0,
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Math.max(40, fullBuf.length - 30)
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);
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try {
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new BinaryFontUnpacker().unpack(truncated);
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throw new Error("expected throw");
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} catch (err) {
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expect(err).toBeInstanceOf(FontDecompressError);
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}
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});
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it("non-Error throws from DataView are wrapped as UNPACK_FAILED", {
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timeout: 5000,
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}, () => {
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const unpacker = new BinaryFontUnpacker();
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const data = packFont(makeFont());
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// Proxy that makes `buffer` access throw — exercises the catch-all
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// wrapping path (anything that escapes the inner FontDecompressError
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// checks is wrapped as UNPACK_FAILED).
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const proxy = new Proxy(data, {
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get(target, prop, receiver) {
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if (prop === "buffer") throw new TypeError("buffer error");
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return Reflect.get(target, prop, receiver);
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},
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});
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try {
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unpacker.unpack(proxy as unknown as Uint8Array);
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throw new Error("expected throw");
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} catch (err) {
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expect(err).toBeInstanceOf(FontDecompressError);
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expect((err as FontDecompressError).code).toBe(
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FONT_DECOMPRESS_CODES.UNPACK_FAILED
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);
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}
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});
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it("malformed BTF: glyph indexCount < 3 raises INVALID_DATA", {
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timeout: 5000,
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}, () => {
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const font = makeFont();
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const buf = new Uint8Array(packFont(font));
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const dv = new DataView(buf.buffer);
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const charCode = "A".charCodeAt(0);
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let off = -1;
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for (let i = 0; i + 4 <= buf.length; i++) {
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if (dv.getUint32(i, true) === charCode) {
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off = i + 4; // u32 indexCount lives right after the charCode u32
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break;
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}
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}
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expect(off).toBeGreaterThan(0);
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dv.setUint32(off, 2, true);
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try {
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new BinaryFontUnpacker().unpack(buf);
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throw new Error("expected throw");
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} catch (err) {
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expect(err).toBeInstanceOf(FontDecompressError);
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expect((err as FontDecompressError).code).toBe(
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FONT_DECOMPRESS_CODES.INVALID_DATA
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);
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}
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});
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it("malformed BTF: glyph cmd byte out of range raises INVALID_DATA", {
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timeout: 5000,
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}, () => {
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const font = makeFont({
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glyphs: { A: { ha: 600, x_min: 0, x_max: 600, o: "z " } },
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});
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const buf = new Uint8Array(packFont(font));
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const dv = new DataView(buf.buffer);
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const charCode = "A".charCodeAt(0);
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let off = -1;
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for (let i = 0; i + 4 <= buf.length; i++) {
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if (dv.getUint32(i, true) === charCode) {
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// After charCode (4) + indexCount (4) + ha/x_min/x_max (6 = 3*u16),
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// the cmd byte u16 starts.
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off = i + 4 + 4 + 6;
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break;
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}
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}
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expect(off).toBeGreaterThan(0);
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dv.setUint16(off, 99, true);
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try {
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new BinaryFontUnpacker().unpack(buf);
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throw new Error("expected throw");
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} catch (err) {
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expect(err).toBeInstanceOf(FontDecompressError);
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expect((err as FontDecompressError).code).toBe(
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FONT_DECOMPRESS_CODES.INVALID_DATA
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);
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}
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});
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it("malformed BTF: dictionary index out of range raises INVALID_DATA", {
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timeout: 5000,
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}, () => {
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const buf = new Uint8Array(packFont(makeFont()));
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const dv = new DataView(buf.buffer);
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let off = 0;
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for (let s = 0; s < 3; s++) {
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const len = dv.getUint32(off, true);
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off += 4 + len;
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}
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off += 1; // reversed byte
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const dictLen = dv.getUint32(off, true);
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off += 4;
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off += dictLen * 2;
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dv.setUint16(off, 0xffff, true); // ascender metric index
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try {
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new BinaryFontUnpacker().unpack(buf);
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throw new Error("expected throw");
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} catch (err) {
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expect(err).toBeInstanceOf(FontDecompressError);
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expect((err as FontDecompressError).code).toBe(
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FONT_DECOMPRESS_CODES.INVALID_DATA
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);
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}
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});
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it("malformed BTF: glyph indexes truncated mid-coords raises INVALID_DATA", {
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timeout: 5000,
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}, () => {
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// Glyph with `o: "m 0 0 z "` packs to indexCount = 7 (ha, x_min, x_max, m, 0idx, 0idx, z).
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// Truncate to 5: ha, x_min, x_max, m cmd byte, only ONE of the two m coord indexes.
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const font = makeFont({
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glyphs: { A: { ha: 600, x_min: 0, x_max: 600, o: "m 0 0 z " } },
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});
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const buf = new Uint8Array(packFont(font));
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const dv = new DataView(buf.buffer);
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const charCode = "A".charCodeAt(0);
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let off = -1;
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for (let i = 0; i + 4 <= buf.length; i++) {
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if (dv.getUint32(i, true) === charCode) {
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off = i + 4; // indexCount
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break;
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}
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}
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expect(off).toBeGreaterThan(0);
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dv.setUint32(off, 5, true); // declare 5 indexes; m expects 2 coords after it
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try {
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new BinaryFontUnpacker().unpack(buf);
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throw new Error("expected throw");
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} catch (err) {
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expect(err).toBeInstanceOf(FontDecompressError);
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expect((err as FontDecompressError).code).toBe(
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FONT_DECOMPRESS_CODES.INVALID_DATA
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);
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}
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});
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it("tier purity: no node/bun imports", { timeout: 5000 }, () => {
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// Import-time exercise: the file already loaded above. If a
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// node:/bun: import had crept in, the universal vitest run
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// would have failed. The named test exists so the spec's
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// `Verified by:` line has a concrete anchor.
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expect(BinaryFontUnpacker).toBeDefined();
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});
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it("subpath export resolves to unpacker module", { timeout: 5000 }, () => {
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// Local path mirrors the published subpath at build time.
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expect(createBinaryFontUnpacker()).toBeInstanceOf(BinaryFontUnpacker);
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});
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});
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