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fix(NODE-6043): Binary.toString and Binary.toJSON output with respect to position #666

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Apr 8, 2024
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10 changes: 5 additions & 5 deletions src/binary.ts
Original file line number Diff line number Diff line change
Expand Up @@ -217,15 +217,15 @@ export class Binary extends BSONValue {
}

toJSON(): string {
return ByteUtils.toBase64(this.buffer);
return ByteUtils.toBase64(this.buffer.subarray(0, this.position));
}

toString(encoding?: 'hex' | 'base64' | 'utf8' | 'utf-8'): string {
if (encoding === 'hex') return ByteUtils.toHex(this.buffer);
if (encoding === 'base64') return ByteUtils.toBase64(this.buffer);
if (encoding === 'hex') return ByteUtils.toHex(this.buffer.subarray(0, this.position));
if (encoding === 'base64') return ByteUtils.toBase64(this.buffer.subarray(0, this.position));
if (encoding === 'utf8' || encoding === 'utf-8')
return ByteUtils.toUTF8(this.buffer, 0, this.buffer.byteLength);
return ByteUtils.toUTF8(this.buffer, 0, this.buffer.byteLength);
return ByteUtils.toUTF8(this.buffer, 0, this.position);
return ByteUtils.toUTF8(this.buffer, 0, this.position);
}

/** @internal */
Expand Down
64 changes: 64 additions & 0 deletions test/node/binary.test.ts
Original file line number Diff line number Diff line change
Expand Up @@ -141,4 +141,68 @@ describe('class Binary', () => {
});
});
});

context('toString()', () => {
context('when case is UTF8 (default)', () => {
it('should respect position when converting to string', () => {
const bin = new Binary();
expect(bin.toString()).to.equal('');
bin.put(1);
expect(bin.toString()).to.equal('\u0001');
});
it('should remain same after round trip', () => {
const bin = new BSON.Binary();
const serializedBin = BSON.serialize({ bin });
const roundTrippedBin = BSON.deserialize(serializedBin);
expect(roundTrippedBin.bin.toString()).to.equal(bin.toString());
});
});

context('when case is hex', () => {
it('should respect position when converting to string', () => {
const bin = new Binary();
expect(bin.toString('hex')).to.equal('');
bin.put(1);
expect(bin.toString('hex')).to.equal('01');
});
it('should remain same after round trip', () => {
const bin = new BSON.Binary();
const serializedBin = BSON.serialize({ bin });
const roundTrippedBin = BSON.deserialize(serializedBin);
expect(roundTrippedBin.bin.toString('hex')).to.equal(bin.toString('hex'));
});
});

context('when case is base64', () => {
it('should respect position when converting to string', () => {
const bin = new Binary();
expect(bin.toString('base64')).to.equal('');
bin.put(1);
expect(bin.toString('base64')).to.equal('AQ==');
});
it('should remain same after round trip', () => {
const bin = new BSON.Binary();
const serializedBin = BSON.serialize({ bin });
const roundTrippedBin = BSON.deserialize(serializedBin);
expect(roundTrippedBin.bin.toString('base64')).to.equal(bin.toString());
});
});
});

context('toJSON()', () => {
it('should respect position when converting to JSON', () => {
const bin = new Binary();
expect(bin.toJSON()).to.equal('');
bin.put(1);
// toJSON uses base64
expect(bin.toJSON()).to.equal('AQ==');
});

it('should remain same after round trip', () => {
const bin = new BSON.Binary();
const serializedBin = BSON.serialize({ bin });
const roundTrippedBin = BSON.deserialize(serializedBin);
expect(roundTrippedBin.bin.toJSON()).to.equal(bin.toJSON());
});
});
});