destroy hb_face correctly

[alsotang]

1. the font file you use is too small, and I think it's broken. I download the file from RuntimeError: memory access out of bounds #8 , and update it.
2. face should be destroyed. You can prove it by log the input value

   subset-font/index.js

   Line 45 in 150b9dd

   const input = exports.hb_subset_input_create_or_fail();

   . This value should not change when input args are the same. And when it get bigger and bigger, the program would fatal. Further more, all alloced ptr should be consistent when input args are the same.

see also https://github.com/harfbuzz/harfbuzzjs/blob/c141d5872698d6f0d95c2853e0ee4540e688dab1/subset/test.cc#L47

3. exports.memory.grow(2000) seems too big. I doubt whether there is such a big font file.

[papandreou]

Please fix/point out one thing per PR/issue, makes it much easier to get things landed quickly :)

2. face should be destroyed. You can prove it by log the input value

Great catch, let's get that landed.

the font file you use is too small, and I think it's broken. I download the file from RuntimeError: memory access out of bounds #8 , and update it.

If you look at the test it's used in, the point is that it's truncated so we exercise the error handling:

subset-font/test/index.js

Lines 203 to 208 in 150b9dd

	describe('with a truncated font', function () {
	before(async function () {
	this.truncatedTtfFont = await readFile(
	pathModule.resolve(__dirname, '..', 'testdata', 'FZZJ-ZSXKJW.ttf')
	);
	});

But I'm OK with checking in the correct file and just truncate it in the test.

exports.memory.grow(2000) seems too big. I doubt whether there is such a big font file.

See Munter/subfont#145

[papandreou]

Released in 1.3.2