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String.js
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import assert from 'assert'; import {String as StringT, uint16le, uint8, DecodeStream, Struct} from 'restructure'; describe('String', function() { describe('decode', function() { it('should decode fixed length', function() { const string = new StringT(7); assert.equal(string.fromBuffer(Buffer.from('testing')), 'testing'); }); it('should decode length from parent key', function() { const stream = new DecodeStream(Buffer.from('testing')); const string = new StringT('len'); assert.equal(string.decode(stream, {len: 7}), 'testing'); }); it('should decode length as number before string', function() { const string = new StringT(uint8); assert.equal(string.fromBuffer(Buffer.from('\x07testing')), 'testing'); }); it('should decode utf8', function() { const string = new StringT(4, 'utf8'); assert.equal(string.fromBuffer(Buffer.from('🍻')), '🍻'); }); it('should decode encoding computed from function', function() { const string = new StringT(4, function() { return 'utf8'; }); assert.equal(string.fromBuffer(Buffer.from('🍻')), '🍻'); }); it('should decode null-terminated string and read past terminator', function() { const stream = new DecodeStream(Buffer.from('🍻\x00')); const string = new StringT(null, 'utf8'); assert.equal(string.decode(stream), '🍻'); assert.equal(stream.pos, 5); }); it('should decode remainder of buffer when null-byte missing', function() { const string = new StringT(null, 'utf8'); assert.equal(string.fromBuffer(Buffer.from('🍻')), '🍻'); }); it('should decode two-byte null-terminated string for utf16le', function() { const stream = new DecodeStream(Buffer.from('🍻\x00', 'utf16le')); const string = new StringT(null, 'utf16le'); assert.equal(string.decode(stream), '🍻'); assert.equal(stream.pos, 6); }); it('should decode remainder of buffer when null-byte missing, utf16le', function() { const string = new StringT(null, 'utf16le'); assert.equal(string.fromBuffer(Buffer.from('🍻', 'utf16le')), '🍻'); }); it('should decode x-mac-roman', function() { const string = new StringT(null, 'x-mac-roman'); const buf = new Uint8Array([0x8a, 0x63, 0x63, 0x65, 0x6e, 0x74, 0x65, 0x64, 0x20, 0x63, 0x68, 0x87, 0x72, 0x61, 0x63, 0x74, 0x65, 0x72, 0x73]); assert.equal(string.fromBuffer(buf), 'äccented cháracters'); }) }); describe('size', function() { it('should use string length', function() { const string = new StringT(7); assert.equal(string.size('testing'), 7); }); it('should use correct encoding', function() { const string = new StringT(10, 'utf8'); assert.equal(string.size('🍻'), 4); }); it('should use encoding from function', function() { const string = new StringT(10, function() { return 'utf8'; }); assert.equal(string.size('🍻'), 4); }); it('should add size of length field before string', function() { const string = new StringT(uint8, 'utf8'); assert.equal(string.size('🍻'), 5); }); it('should work with utf16be encoding', function() { const string = new StringT(10, 'utf16be'); assert.equal(string.size('🍻'), 4); }); it('should take null-byte into account', function() { const string = new StringT(null, 'utf8'); assert.equal(string.size('🍻'), 5); }); it('should take null-byte into account, utf16le', function() { const string = new StringT(null, 'utf16le'); assert.equal(string.size('🍻'), 6); }); it('should use defined length if no value given', function() { const array = new StringT(10); assert.equal(array.size(), 10); }); }); describe('encode', function() { it('should encode using string length', function() { const string = new StringT(7); assert.deepEqual(string.toBuffer('testing'), Buffer.from('testing')); }); it('should encode length as number before string', function() { const string = new StringT(uint8); assert.deepEqual(string.toBuffer('testing'), Buffer.from('\x07testing')); }); it('should encode length as number before string utf8', function() { const string = new StringT(uint8, 'utf8'); assert.deepEqual(string.toBuffer('testing 😜'), Buffer.from('\x0ctesting 😜', 'utf8')); }); it('should encode utf8', function() { const string = new StringT(4, 'utf8'); assert.deepEqual(string.toBuffer('🍻'), Buffer.from('🍻')); }); it('should encode encoding computed from function', function() { const string = new StringT(4, function() { return 'utf8'; }); assert.deepEqual(string.toBuffer('🍻'), Buffer.from('🍻')); }); it('should encode null-terminated string', function() { const string = new StringT(null, 'utf8'); assert.deepEqual(string.toBuffer('🍻'), Buffer.from('🍻\x00')); }); it('should encode using string length, utf16le', function() { const string = new StringT(16, 'utf16le'); assert.deepEqual(string.toBuffer('testing'), Buffer.from('testing', 'utf16le')); }); it('should encode length as number before string utf16le', function() { const string = new StringT(uint16le, 'utf16le'); assert.deepEqual(string.toBuffer('testing 😜'), Buffer.from('\u0014testing 😜', 'utf16le')); }); it('should encode two-byte null-terminated string for UTF-16', function() { const string = new StringT(null, 'utf16le'); assert.deepEqual(string.toBuffer('🍻'), Buffer.from('🍻\x00', 'utf16le')); }); }); });