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import { describe, expect, it } from "bun:test";
import { withoutAggressiveGC } from "harness";
const RealStringDecoder = require("string_decoder").StringDecoder;
it("require('string_decoder')", async () => {
expect((await import("string_decoder")).StringDecoder).toBe(RealStringDecoder);
});
it("Bun.inspect(StringDecoder)", async () => {
expect((await Bun.inspect(RealStringDecoder).length) > 0).toBe(true);
});
function FakeStringDecoderCall() {
RealStringDecoder.apply(this, arguments);
}
require("util").inherits(FakeStringDecoderCall, RealStringDecoder);
// extending StringDecoder is not supported
for (const StringDecoder of [FakeStringDecoderCall, RealStringDecoder]) {
describe(StringDecoder.name, () => {
it("StringDecoder-utf8", () => {
test("utf-8", Buffer.from("$", "utf-8"), "$");
test("utf-8", Buffer.from("¢", "utf-8"), "¢");
test("utf-8", Buffer.from("€", "utf-8"), "€");
test("utf-8", Buffer.from("𤭢", "utf-8"), "𤭢");
// A mixed ascii and non-ascii string
// Test stolen from deps/v8/test/cctest/test-strings.cc
// U+02E4 -> CB A4
// U+0064 -> 64
// U+12E4 -> E1 8B A4
// U+0030 -> 30
// U+3045 -> E3 81 85
test(
"utf-8",
Buffer.from([0xcb, 0xa4, 0x64, 0xe1, 0x8b, 0xa4, 0x30, 0xe3, 0x81, 0x85]),
"\u02e4\u0064\u12e4\u0030\u3045",
);
});
it("StringDecoder-ucs-2", () => {
test("ucs2", Buffer.from("ababc", "ucs2"), "ababc");
});
it("StringDecoder-utf16le", () => {
test("utf16le", Buffer.from("3DD84DDC", "hex"), "\ud83d\udc4d");
});
it("StringDecoder-utf8-additional", () => {
let decoder = new StringDecoder("utf8");
expect(decoder.write(Buffer.from("E18B", "hex"))).toBe("");
expect(decoder.end()).toBe("\ufffd");
decoder = new StringDecoder("utf8");
expect(decoder.write(Buffer.from("\ufffd"))).toBe("\ufffd");
expect(decoder.end()).toBe("");
decoder = new StringDecoder("utf8");
expect(decoder.write(Buffer.from("\ufffd\ufffd\ufffd"))).toBe("\ufffd\ufffd\ufffd");
expect(decoder.end()).toBe("");
decoder = new StringDecoder("utf8");
expect(decoder.write(Buffer.from("EFBFBDE2", "hex"))).toBe("\ufffd");
expect(decoder.end()).toBe("\ufffd");
decoder = new StringDecoder("utf8");
expect(decoder.write(Buffer.from("F1", "hex"))).toBe("");
expect(decoder.write(Buffer.from("41F2", "hex"))).toBe("\ufffdA");
expect(decoder.end()).toBe("\ufffd");
// Additional utf8Text test
decoder = new StringDecoder("utf8");
expect(decoder.text(Buffer.from([0x41]), 2)).toBe("");
});
it("StringDecoder-utf16le-additional", () => {
// Additional UTF-16LE surrogate pair tests
let decoder = new StringDecoder("utf16le");
expect(decoder.write(Buffer.from("3DD8", "hex"))).toBe("");
expect(decoder.write(Buffer.from("4D", "hex"))).toBe("");
expect(decoder.write(Buffer.from("DC", "hex"))).toBe("\ud83d\udc4d");
expect(decoder.end()).toBe("");
decoder = new StringDecoder("utf16le");
expect(decoder.write(Buffer.from("3DD8", "hex"))).toBe("");
expect(decoder.end()).toBe("\ud83d");
decoder = new StringDecoder("utf16le");
expect(decoder.write(Buffer.from("3DD8", "hex"))).toBe("");
expect(decoder.write(Buffer.from("4D", "hex"))).toBe("");
expect(decoder.end()).toBe("\ud83d");
decoder = new StringDecoder("utf16le");
expect(decoder.write(Buffer.from("3DD84D", "hex"))).toBe("\ud83d");
expect(decoder.end()).toBe("");
});
// Test verifies that StringDecoder will correctly decode the given input
// buffer with the given encoding to the expected output. It will attempt all
// possible ways to write() the input buffer, see writeSequences(). The
// singleSequence allows for easy debugging of a specific sequence which is
// useful in case of test failures.
function test(encoding, input, expected, singleSequence) {
withoutAggressiveGC(() => {
let sequences;
if (!singleSequence) {
sequences = writeSequences(input.length);
} else {
sequences = [singleSequence];
}
sequences.forEach(sequence => {
const decoder = new StringDecoder(encoding);
let output = "";
sequence.forEach(write => {
output += decoder.write(input.slice(write[0], write[1]));
});
output += decoder.end();
expect(output).toBe(expected);
});
});
}
// writeSequences returns an array of arrays that describes all possible ways a
// buffer of the given length could be split up and passed to sequential write
// calls.
//
// e.G. writeSequences(3) will return: [
// [ [ 0, 3 ] ],
// [ [ 0, 2 ], [ 2, 3 ] ],
// [ [ 0, 1 ], [ 1, 3 ] ],
// [ [ 0, 1 ], [ 1, 2 ], [ 2, 3 ] ]
// ]
function writeSequences(length, start, sequence) {
if (start === undefined) {
start = 0;
sequence = [];
} else if (start === length) {
return [sequence];
}
let sequences = [];
for (let end = length; end > start; end--) {
const subSequence = sequence.concat([[start, end]]);
const subSequences = writeSequences(length, end, subSequence, sequences);
sequences = sequences.concat(subSequences);
}
return sequences;
}
describe("StringDecoder.end", () => {
const encodings = ["base64", "base64url", "hex", "utf8", "utf16le", "ucs2"];
const bufs = ["☃💩", "asdf"].map(b => Buffer.from(b));
// Also test just arbitrary bytes from 0-15.
for (let i = 1; i <= 16; i++) {
const bytes = "."
.repeat(i - 1)
.split(".")
.map((_, j) => j + 0x78);
bufs.push(Buffer.from(bytes));
}
encodings.forEach(testEncoding);
testEnd("utf8", Buffer.of(0xe2), Buffer.of(0x61), "\uFFFDa");
testEnd("utf8", Buffer.of(0xe2), Buffer.of(0x82), "\uFFFD\uFFFD");
testEnd("utf8", Buffer.of(0xe2), Buffer.of(0xe2), "\uFFFD\uFFFD");
testEnd("utf8", Buffer.of(0xe2, 0x82), Buffer.of(0x61), "\uFFFDa");
testEnd("utf8", Buffer.of(0xe2, 0x82), Buffer.of(0xac), "\uFFFD\uFFFD");
testEnd("utf8", Buffer.of(0xe2, 0x82), Buffer.of(0xe2), "\uFFFD\uFFFD");
testEnd("utf8", Buffer.of(0xe2, 0x82, 0xac), Buffer.of(0x61), "€a");
testEnd("utf16le", Buffer.of(0x3d), Buffer.of(0x61, 0x00), "a");
testEnd("utf16le", Buffer.of(0x3d), Buffer.of(0xd8, 0x4d, 0xdc), "\u4DD8");
testEnd("utf16le", Buffer.of(0x3d, 0xd8), Buffer.of(), "\uD83D");
testEnd("utf16le", Buffer.of(0x3d, 0xd8), Buffer.of(0x61, 0x00), "\uD83Da");
testEnd("utf16le", Buffer.of(0x3d, 0xd8), Buffer.of(0x4d, 0xdc), "\uD83D\uDC4D");
testEnd("utf16le", Buffer.of(0x3d, 0xd8, 0x4d), Buffer.of(), "\uD83D");
testEnd("utf16le", Buffer.of(0x3d, 0xd8, 0x4d), Buffer.of(0x61, 0x00), "\uD83Da");
testEnd("utf16le", Buffer.of(0x3d, 0xd8, 0x4d), Buffer.of(0xdc), "\uD83D");
testEnd("utf16le", Buffer.of(0x3d, 0xd8, 0x4d, 0xdc), Buffer.of(0x61, 0x00), "👍a");
testEnd("base64", Buffer.of(0x61), Buffer.of(), "YQ==");
testEnd("base64", Buffer.of(0x61), Buffer.of(0x61), "YQ==YQ==");
testEnd("base64", Buffer.of(0x61, 0x61), Buffer.of(), "YWE=");
testEnd("base64", Buffer.of(0x61, 0x61), Buffer.of(0x61), "YWE=YQ==");
testEnd("base64", Buffer.of(0x61, 0x61, 0x61), Buffer.of(), "YWFh");
testEnd("base64", Buffer.of(0x61, 0x61, 0x61), Buffer.of(0x61), "YWFhYQ==");
testEnd("base64url", Buffer.of(0x61), Buffer.of(), "YQ");
testEnd("base64url", Buffer.of(0x61), Buffer.of(0x61), "YQYQ");
testEnd("base64url", Buffer.of(0x61, 0x61), Buffer.of(), "YWE");
testEnd("base64url", Buffer.of(0x61, 0x61), Buffer.of(0x61), "YWEYQ");
testEnd("base64url", Buffer.of(0x61, 0x61, 0x61), Buffer.of(), "YWFh");
testEnd("base64url", Buffer.of(0x61, 0x61, 0x61), Buffer.of(0x61), "YWFhYQ");
function testEncoding(encoding) {
it(encoding + " testbuf", () => {
bufs.forEach(buf => {
testBuf(encoding, buf);
});
});
}
function testBuf(encoding, buf) {
// Write one byte at a time.
let s = new StringDecoder(encoding);
let res1 = "";
for (let i = 0; i < buf.length; i++) {
res1 += s.write(buf.slice(i, i + 1));
}
res1 += s.end();
// Write the whole buffer at once.
let res2 = "";
s = new StringDecoder(encoding);
res2 += s.write(buf);
res2 += s.end();
// .toString() on the buffer
const res3 = buf.toString(encoding);
// One byte at a time should match toString
expect(res1).toEqual(res3);
// All bytes at once should match toString
expect(res2).toEqual(res3);
}
function testEnd(encoding, incomplete, next, expected) {
it(`${encoding} partial ${JSON.stringify(expected)}`, () => {
let res = "";
const s = new StringDecoder(encoding);
res += s.write(incomplete);
res += s.end();
res += s.write(next);
res += s.end();
expect(res).toEqual(expected);
});
}
});
});
}
it("invalid utf-8 input, pr #3562", () => {
const decoder = new RealStringDecoder("utf-8");
let output = "";
output += decoder.write(Buffer.from("B9", "hex"));
output += decoder.write(Buffer.from("A9", "hex"));
output += decoder.end();
expect(output).toStrictEqual("\uFFFD\uFFFD");
});
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