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import { expect, it } from "bun:test";
import { StringDecoder } from "string_decoder";
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) {
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;
}
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