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var assert = require('assert');
var hpack = require('../');
var fixtures = require('./fixtures');
describe('hpack/decompressor', function() {
var decomp;
beforeEach(function() {
decomp = hpack.decompressor.create({
table: {
maxSize: 1024
}
});
});
describe('indexed field', function() {
it('should fail on 0-index', function(cb) {
decomp.write(new Buffer([ 0b10000000 ]));
decomp.execute(function(err) {
assert(/zero index/i.test(err.message), err.message);
cb();
});
});
it('should fetch entry from static table', function() {
decomp.write(new Buffer([ 0b10000000 | 2 ]));
decomp.execute();
var field = decomp.read();
assert.equal(field.name, ':method');
assert.equal(field.value, 'GET');
});
it('should fetch entry from the end of the static table', function() {
decomp.write(new Buffer([ 0b10000000 | 61 ]));
decomp.execute();
var field = decomp.read();
assert.equal(field.name, 'www-authenticate');
assert.equal(field.value, '');
});
it('should fail on OOB-index', function(cb) {
decomp.write(new Buffer([ 0b11000000 ]));
decomp.execute(function(err) {
assert(/field oob/i.test(err.message), err.message);
cb();
});
});
});
describe('literal field', function() {
it('should lookup name in the table (incremental)', function() {
var value = new Buffer('localhost');
var header = new Buffer([
0b01000000 | 38, // 38th element from static table
value.length
]);
decomp.write(Buffer.concat([ header, value ]));
decomp.execute();
var field = decomp.read();
assert.equal(field.name, 'host');
assert.equal(field.value, 'localhost');
decomp.write(new Buffer([ 0b10000000 | 62 ]));
decomp.execute();
var field = decomp.read();
assert.equal(field.name, 'host');
assert.equal(field.value, 'localhost');
});
it('should lookup name in the table (not-incremental)', function(cb) {
var value = new Buffer('localhost');
var header = new Buffer([
0b00001111,
0b00000000 | 23,
value.length
]);
decomp.write(Buffer.concat([ header, value ]));
decomp.execute();
var field = decomp.read();
assert.equal(field.name, 'host');
assert.equal(field.value, 'localhost');
decomp.write(new Buffer([ 0b10000000 | 62 ]));
decomp.execute(function(err) {
assert(/field oob/i.test(err.message), err.message);
cb();
});
});
it('should evict header field from the table', function() {
var value = new Buffer('localhost');
var header = new Buffer([
0b01000000 | 38, // 38th element from static table
value.length
]);
for (var i = 0; i < 1000; i++) {
decomp.write(Buffer.concat([ header, value ]));
decomp.execute();
var field = decomp.read();
assert.equal(field.name, 'host');
assert.equal(field.value, 'localhost');
}
assert(decomp._table.size < decomp._table.maxSize);
assert.equal(decomp._table.dynamic.length, 22);
});
});
describe('update size', function() {
it('should evict header field from the table', function() {
var value = new Buffer('localhost');
var header = new Buffer([
0b01000000 | 38, // 38th element from static table
value.length
]);
decomp.write(Buffer.concat([ header, value ]));
decomp.execute();
var field = decomp.read();
assert.equal(field.name, 'host');
assert.equal(field.value, 'localhost');
assert.equal(decomp._table.dynamic.length, 1);
decomp.write(new Buffer([
0b00100000
]));
decomp.execute();
assert.equal(decomp._table.dynamic.length, 0);
});
});
describe('spec examples', function() {
var decomp;
beforeEach(function() {
decomp = hpack.decompressor.create({
table: {
maxSize: 256
}
});
});
var tests = fixtures.specExamples;
tests.forEach(function(test, i) {
var prev = tests[i - 1];
it('should give expected output on ' + test.id, function() {
var startFrom = test.continuation ? prev.decomp : decomp;
if (!startFrom)
throw new Error('Previous test failed');
decomp = startFrom;
decomp.write(new Buffer(test.input.replace(/ /g, ''), 'hex'));
decomp.execute();
var output = [];
for (;;) {
var chunk = decomp.read();
if (!chunk)
break;
output.push([ chunk.name, chunk.value ]);
}
assert.deepEqual(output, test.output);
// Verify table contents
assert.deepEqual(decomp._table.dynamic.map(function(header) {
return [ header.name, header.value, header.totalSize ];
}).reverse(), test.table);
// Verify table size
var expectedSize = test.table.reduce(function(acc, item) {
return acc + item[2];
}, 0);
assert.equal(decomp._table.size, expectedSize);
test.decomp = decomp;
});
});
});
});