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'use strict';
var common = require('../common');
var assert = require('assert');
var zlib = require('zlib');
var path = require('path');
var zlibPairs =
[[zlib.Deflate, zlib.Inflate],
[zlib.Gzip, zlib.Gunzip],
[zlib.Deflate, zlib.Unzip],
[zlib.Gzip, zlib.Unzip],
[zlib.DeflateRaw, zlib.InflateRaw]];
// how fast to trickle through the slowstream
var trickle = [128, 1024, 1024 * 1024];
// tunable options for zlib classes.
// several different chunk sizes
var chunkSize = [128, 1024, 1024 * 16, 1024 * 1024];
// this is every possible value.
var level = [-1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9];
var windowBits = [8, 9, 10, 11, 12, 13, 14, 15];
var memLevel = [1, 2, 3, 4, 5, 6, 7, 8, 9];
var strategy = [0, 1, 2, 3, 4];
// it's nice in theory to test every combination, but it
// takes WAY too long. Maybe a pummel test could do this?
if (!process.env.PUMMEL) {
trickle = [1024];
chunkSize = [1024 * 16];
level = [6];
memLevel = [8];
windowBits = [15];
strategy = [0];
}
var fs = require('fs');
var testFiles = ['person.jpg', 'elipses.txt', 'empty.txt'];
if (process.env.FAST) {
zlibPairs = [[zlib.Gzip, zlib.Unzip]];
testFiles = ['person.jpg'];
}
var tests = {};
testFiles.forEach(function(file) {
tests[file] = fs.readFileSync(path.resolve(common.fixturesDir, file));
});
var util = require('util');
var stream = require('stream');
// stream that saves everything
function BufferStream() {
this.chunks = [];
this.length = 0;
this.writable = true;
this.readable = true;
}
util.inherits(BufferStream, stream.Stream);
BufferStream.prototype.write = function(c) {
this.chunks.push(c);
this.length += c.length;
return true;
};
BufferStream.prototype.end = function(c) {
if (c) this.write(c);
// flatten
var buf = new Buffer(this.length);
var i = 0;
this.chunks.forEach(function(c) {
c.copy(buf, i);
i += c.length;
});
this.emit('data', buf);
this.emit('end');
return true;
};
function SlowStream(trickle) {
this.trickle = trickle;
this.offset = 0;
this.readable = this.writable = true;
}
util.inherits(SlowStream, stream.Stream);
SlowStream.prototype.write = function() {
throw new Error('not implemented, just call ss.end(chunk)');
};
SlowStream.prototype.pause = function() {
this.paused = true;
this.emit('pause');
};
SlowStream.prototype.resume = function() {
var self = this;
if (self.ended) return;
self.emit('resume');
if (!self.chunk) return;
self.paused = false;
emit();
function emit() {
if (self.paused) return;
if (self.offset >= self.length) {
self.ended = true;
return self.emit('end');
}
var end = Math.min(self.offset + self.trickle, self.length);
var c = self.chunk.slice(self.offset, end);
self.offset += c.length;
self.emit('data', c);
process.nextTick(emit);
}
};
SlowStream.prototype.end = function(chunk) {
// walk over the chunk in blocks.
var self = this;
self.chunk = chunk;
self.length = chunk.length;
self.resume();
return self.ended;
};
// for each of the files, make sure that compressing and
// decompressing results in the same data, for every combination
// of the options set above.
var failures = 0;
var total = 0;
var done = 0;
Object.keys(tests).forEach(function(file) {
var test = tests[file];
chunkSize.forEach(function(chunkSize) {
trickle.forEach(function(trickle) {
windowBits.forEach(function(windowBits) {
level.forEach(function(level) {
memLevel.forEach(function(memLevel) {
strategy.forEach(function(strategy) {
zlibPairs.forEach(function(pair) {
var Def = pair[0];
var Inf = pair[1];
var opts = { level: level,
windowBits: windowBits,
memLevel: memLevel,
strategy: strategy };
total++;
var def = new Def(opts);
var inf = new Inf(opts);
var ss = new SlowStream(trickle);
var buf = new BufferStream();
// verify that the same exact buffer comes out the other end.
buf.on('data', function(c) {
var msg = file + ' ' +
chunkSize + ' ' +
JSON.stringify(opts) + ' ' +
Def.name + ' -> ' + Inf.name;
var ok = true;
var testNum = ++done;
for (var i = 0; i < Math.max(c.length, test.length); i++) {
if (c[i] !== test[i]) {
ok = false;
failures++;
break;
}
}
if (ok) {
console.log('ok ' + (testNum) + ' ' + msg);
} else {
console.log('not ok ' + (testNum) + ' ' + msg);
console.log(' ...');
console.log(' testfile: ' + file);
console.log(' type: ' + Def.name + ' -> ' + Inf.name);
console.log(' position: ' + i);
console.log(' options: ' + JSON.stringify(opts));
console.log(' expect: ' + test[i]);
console.log(' actual: ' + c[i]);
console.log(' chunkSize: ' + chunkSize);
console.log(' ---');
}
});
// the magic happens here.
ss.pipe(def).pipe(inf).pipe(buf);
ss.end(test);
});
}); }); }); }); }); }); // sad stallman is sad.
});
process.on('exit', function(code) {
console.log('1..' + done);
assert.equal(done, total, (total - done) + ' tests left unfinished');
assert.ok(!failures, 'some test failures');
});
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