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test_DataStream.html
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<html>
<body></body>
<script src="encoding-indexes.js"></script>
<script src="encoding.js"></script>
<script src="DataStream.js"></script>
<script>
function assert(b) {
if (!b) {
throw('assert failed');
}
};
function assertEqual(a,b) {
if (a != b) {
throw('assertEqual failed: '+a+' != '+b);
}
};
function assertEqualArray(a,b) {
if (a.length != b.length) {
throw('assertEqualArray failed (length): '+a.length+' != '+b.length);
}
for (var i=0; i<a.length; i++) {
if (a[i] != b[i]) {
throw('assertEqualArray failed at '+i+': '+a[i]+' != '+b[i]);
}
}
};
function assertNotEqual(a,b) {
if (a == b) {
throw('assertNotEqual failed: '+a+' == '+b);
}
};
function assertFail(f) {
var success = true;
try { f(); success = false; } catch(e) { }
if (!success) {
throw('assertFail failed: '+f.toString());
}
};
var testType = function(ds, t, elen) {
var i = 0;
var boff = ds.byteOffset;
var blen = ds.byteLength;
ds.dynamicSize = true;
ds.endianness = DataStream.LITTLE_ENDIAN;
ds.seek(0);
for (i=0; i<Math.floor(ds.byteLength/elen); i++) {
ds["write"+t](125);
}
assertEqual(ds.position , elen*i);
assertEqual(ds.byteLength , blen);
assertEqual(ds.buffer.byteLength , ds.byteLength+boff);
ds.seek(0);
for (i=0; i<Math.floor(ds.byteLength/elen); i++) {
assertEqual(ds["read"+t](), 125);
}
assertEqual(ds.position , elen*i);
assertEqual(ds.byteLength , blen);
assertEqual(ds.buffer.byteLength , ds.byteLength+boff);
ds.endianness = DataStream.BIG_ENDIAN;
ds.seek(0);
if (elen > 1) {
for (i=0; i<Math.floor(ds.byteLength/elen); i++) {
assertNotEqual(ds["read"+t](), 125);
}
}
ds.seek(0);
for (i=0; i<Math.floor(ds.byteLength/elen); i++) {
ds["write"+t](125);
}
assertEqual(ds.position , elen*i);
assertEqual(ds.byteLength , blen);
assertEqual(ds.buffer.byteLength , ds.byteLength+boff);
ds.seek(0);
for (i=0; i<Math.floor(ds.byteLength/elen); i++) {
assertEqual(ds["read"+t](), 125);
}
assertEqual(ds.position , elen*i);
assertEqual(ds.byteLength , blen);
assertEqual(ds.buffer.byteLength , ds.byteLength+boff);
assertFail(function() {
ds["read"+t]();
});
ds.dynamicSize = false;
assertFail(function() {
ds["write"+t](125);
});
testTypeArray(ds, t, elen);
};
var testSubArray = function (typedArrayConstructor, t, arr) {
var typedArr = new typedArrayConstructor(arr);
var ds = new DataStream();
ds["write" + t + "Array"](typedArr.subarray(1));
ds.seek(0);
var outSubArray = ds["read" + t + "Array"](arr.length - 1);
assertEqualArray(typedArr.subarray(1), outSubArray);
}
var testDS = function(i, ds, boff, blen, t, elen, arr) {
ds.dynamicSize = true;
ds.endianness = DataStream.LITTLE_ENDIAN;
ds.seek(0);
ds["write"+t+"Array"](arr);
assertEqual(ds.position , elen*i);
assertEqual(ds.byteLength , blen);
assertEqual(ds.buffer.byteLength , ds.byteLength+boff);
ds.seek(0);
var rarr = ds["read"+t+"Array"](arr.length);
testSubArray(rarr.constructor, t, arr);
ds.seek(0);
var rarr2 = [];
for (i=0; i<arr.length; i++) {
rarr2.push(ds["read"+t]());
}
for (i=0; i<Math.floor(ds.byteLength/elen); i++) {
assertEqual(rarr[i], arr[i]);
assertEqual(rarr[i], rarr2[i]);
}
assertEqual(ds.position , elen*i);
assertEqual(ds.byteLength , blen);
assertEqual(ds.buffer.byteLength , ds.byteLength+boff);
ds.seek(0);
for (var i=0; i<arr.length; i++) {
ds["write"+t](arr[i]);
}
assertEqual(ds.position , elen*i);
assertEqual(ds.byteLength , blen);
assertEqual(ds.buffer.byteLength , ds.byteLength+boff);
ds.seek(0);
var rarr = ds["read"+t+"Array"](arr.length);
for (i=0; i<Math.floor(ds.byteLength/elen); i++) {
assertEqual(rarr[i], arr[i]);
}
assertEqual(ds.position , elen*i);
assertEqual(ds.byteLength , blen);
assertEqual(ds.buffer.byteLength , ds.byteLength+boff);
// Map tests
if (ds.byteOffset & rarr.BYTES_PER_ELEMENT === 0) {
ds.seek(0);
var rarr = ds["map"+t+"Array"](arr.length);
ds.seek(0);
for (i=0; i<Math.floor(ds.byteLength/elen); i++) {
assertEqual(rarr[i], arr[i]);
rarr[i] = 127;
}
ds.seek(0);
var warr = ds["read"+t+"Array"](arr.length);
for (i=0; i<Math.floor(ds.byteLength/elen); i++) {
assertEqual(warr[i], 127);
}
ds.endianness = DataStream.BIG_ENDIAN;
ds.seek(0);
var rarr = ds["map"+t+"Array"](arr.length);
ds.seek(0);
for (i=0; i<Math.floor(ds.byteLength/elen); i++) {
assertNotEqual(rarr[i], arr[i]);
rarr[i] = 127;
}
ds.seek(0);
if (elen > 1) {
var warr = ds["read"+t+"Array"](arr.length);
for (i=0; i<Math.floor(ds.byteLength/elen); i++) {
assertNotEqual(warr[i], 127);
}
}
ds.seek(0);
ds["map"+t+"Array"](arr.length);
ds.seek(0);
var warr = ds["read"+t+"Array"](arr.length);
for (i=0; i<Math.floor(ds.byteLength/elen); i++) {
assertEqual(warr[i], 127);
}
assertEqual(ds.position , elen*i);
assertEqual(ds.byteLength , blen);
assertEqual(ds.buffer.byteLength , ds.byteLength+boff);
ds.endianness = DataStream.BIG_ENDIAN;
ds.seek(0);
var rarr = ds["read"+t+"Array"](arr.length);
if (elen > 1) {
for (i=0; i<Math.floor(ds.byteLength/elen); i++) {
assertNotEqual(rarr[i], arr[i]);
}
}
}
ds.seek(0);
ds["write"+t+"Array"](arr);
assertEqual(ds.position , elen*i);
assertEqual(ds.byteLength , blen);
assertEqual(ds.buffer.byteLength , ds.byteLength+boff);
ds.seek(0);
var rarr = ds["read"+t+"Array"](arr.length);
for (i=0; i<Math.floor(ds.byteLength/elen); i++) {
assertEqual(rarr[i], arr[i]);
}
ds.seek(0);
for (i=0; i<Math.floor(ds.byteLength/elen); i++) {
assertEqual(ds["read"+t](), arr[i]);
}
assertEqual(ds.position , elen*i);
assertEqual(ds.byteLength , blen);
assertEqual(ds.buffer.byteLength , ds.byteLength+boff);
assertFail(function() {
ds["read"+t+"Array"](1);
});
ds.dynamicSize = false;
assertFail(function() {
ds["write"+t+"Array"]([125]);
});
var ds2 = new DataStream();
ds2["write"+t+"Array"](arr);
ds2.seek(0);
var rarr = ds2["read"+t+"Array"](arr.length);
for (i=0; i<ds2.byteLength/elen; i++) {
assertEqual(rarr[i], arr[i]);
}
ds2.buffer;
assertFail(function() {
ds2["read"+t+"Array"](1);
});
};
var testTypeArray = function(ds, t, elen) {
var i = 0;
var boff = ds.byteOffset;
var blen = ds.byteLength;
var arr = [];
for (i=0; i<Math.floor(ds.byteLength/elen); i++) {
arr.push((125 + i) % 127);
}
testDS(i, ds, boff, blen, t, elen, arr);
var arr = new this[t+"Array"](ds.byteLength/elen);
for (i=0; i<arr.length; i++) {
arr[i] = (125 + i) % 127;
}
testDS(i, ds, boff, blen, t, elen, arr);
};
var test_constructor = function() {
var buf = new ArrayBuffer(100);
var ds = new DataStream(buf);
assertEqual(ds.byteLength, buf.byteLength);
assertEqual(ds.endianness, DataStream.LITTLE_ENDIAN);
for (var i=0; i<100; i++) {
ds = new DataStream(buf, i);
ds = new DataStream(buf, i, DataStream.BIG_ENDIAN);
ds = new DataStream(buf, i, DataStream.LITTLE_ENDIAN);
assertEqual(ds.byteLength, buf.byteLength-i);
assertEqual(ds.byteOffset, i);
}
ds = new DataStream(buf, 2, DataStream.BIG_ENDIAN);
assertEqual(ds.endianness, DataStream.BIG_ENDIAN);
ds = new DataStream(buf, null, DataStream.BIG_ENDIAN);
assertEqual(ds.endianness, DataStream.BIG_ENDIAN);
assertEqual(ds.byteLength, buf.byteLength);
ds = new DataStream(buf, null, DataStream.LITTLE_ENDIAN);
assertEqual(ds.endianness, DataStream.LITTLE_ENDIAN);
assertEqual(ds.byteLength, buf.byteLength);
var dv = new DataView(buf);
ds = new DataStream(dv, 0, DataStream.BIG_ENDIAN);
assertEqual(ds.endianness, DataStream.BIG_ENDIAN);
assertEqual(ds.byteLength, buf.byteLength);
assertEqual(ds.byteOffset, dv.byteOffset);
for (var i=0; i<100; i++) {
dv = new DataView(buf, i);
ds = new DataStream(dv);
assertEqual(ds.byteLength, buf.byteLength-i);
assertEqual(ds.byteOffset, dv.byteOffset);
}
for (var i=0; i<50; i++) {
dv = new DataView(buf, 50);
ds = new DataStream(dv, i);
assertEqual(ds.byteLength, buf.byteLength-i-dv.byteOffset);
assertEqual(ds.byteOffset, dv.byteOffset+i);
}
for (var i=0; i<100; i++) {
dv = new Uint8Array(buf, i);
ds = new DataStream(dv);
assertEqual(ds.byteLength, buf.byteLength-i);
assertEqual(ds.byteOffset, dv.byteOffset);
}
for (var i=0; i<50; i++) {
dv = new Uint8Array(buf, 50);
ds = new DataStream(dv, i);
assertEqual(ds.byteLength, buf.byteLength-i-dv.byteOffset);
assertEqual(ds.byteOffset, dv.byteOffset+i);
}
for (var i=0; i<25; i++) {
dv = new Float32Array(buf, i*4);
ds = new DataStream(dv);
assertEqual(ds.byteLength, buf.byteLength-i*4);
assertEqual(ds.byteOffset, dv.byteOffset);
}
for (var i=0; i<12; i++) {
dv = new Float32Array(buf, 12);
ds = new DataStream(dv, i);
assertEqual(ds.byteLength, buf.byteLength-i-dv.byteOffset);
assertEqual(ds.byteOffset, dv.byteOffset+i);
}
};
var testStruct = function() {
var embed = [
'tag', 'uint32be',
'code', 'uint32le',
'greet', 'cstring'
];
var def = [
'tag', 'cstring:4',
'code', 'uint32le',
'embed', embed,
'length', 'uint16be',
'data', ['[]', 'float32be', 'length'],
'greet', 'cstring:20',
'endNote', 'uint8'
];
var u = [137, 80, 78, 71, 0, 136, 136, 254, 137, 80,
78, 71, 0, 136, 136, 255, 72, 101, 108, 108,
111, 44, 32, 87, 111, 114, 108, 100, 33, 0,
0, 2, 0, 1, 2, 3, 1, 2, 3, 4,
72, 101, 108, 108, 111, 44, 32, 87, 111, 114,
108, 100, 33, 0, 0, 0, 0, 0, 0, 0,
255];
var ds = new DataStream();
ds.writeUint8Array(u);
ds.writeUint8Array(u);
ds.seek(0);
var obj = ds.readStruct(def);
var obj2 = ds.readStruct(def);
var d1 = obj.data;
var d2 = obj2.data;
delete obj.data;
delete obj2.data;
assertEqual(255, obj.endNote);
assertEqual(255, obj2.endNote);
assertEqual(JSON.stringify(obj), JSON.stringify(obj2));
assertEqualArray(d1, d2);
var p = ds.position;
obj.data = d1;
ds.writeStruct(def, obj);
delete obj.data;
ds.seek(p);
var obj3 = ds.readStruct(def);
var d3 = obj3.data;
delete obj3.data;
ds.seek(p);
assertEqual(255, obj3.endNote);
assertEqualArray(u, ds.readUint8Array(u.length));
assertEqual(JSON.stringify(obj), JSON.stringify(obj3));
assertEqualArray(d1, d3);
var def2 = [
'one', 'float32',
'two', 'float32be',
'three', 'float32le',
'four', 'float32'
];
var u2 = [1,1,1,1];
var ds2 = new DataStream();
ds2.writeFloat32Array(u2, DataStream.LITTLE_ENDIAN);
ds2.seek(0);
ds2.endianness = DataStream.LITTLE_ENDIAN;
var o2 = ds2.readStruct(def2);
assertEqual(o2.one, 1);
assertEqual(o2.four, 1);
assertNotEqual(o2.two, o2.three);
assertEqual(o2.one, o2.four);
assertEqual(o2.one, o2.three);
assertNotEqual(o2.one/*LE*/, o2.two/*BE*/);
assertEqual(o2.one/*LE*/, o2.three/*LE*/);
ds2.seek(0);
ds2.endianness = DataStream.BIG_ENDIAN;
o2 = ds2.readStruct(def2);
assertNotEqual(o2.one, 1);
assertNotEqual(o2.four, 1);
assertNotEqual(o2.two, o2.three);
assertEqual(o2.one, o2.four);
assertEqual(o2.one/*BE*/, o2.two/*BE*/);
assertNotEqual(o2.one/*BE*/, o2.three/*LE*/);
var def3 = [
'length', 'uint16be',
'data', ['[]', 'uint8', function(s) { return s.length-2; }],
'endNote', 'uint8'
];
var u3 = [0,8,1,2,3,4,5,6,255];
var ds3 = new DataStream();
ds3.writeUint8Array(u3);
ds3.seek(0);
var o3 = ds3.readStruct(def3);
assertEqual(o3.length, 8);
assertEqual(o3.endNote, 255);
assertEqualArray(o3.data, [1,2,3,4,5,6]);
var def4 = [
'length', 'uint16be',
'data', {
get: function(ds, s) {
var o = {odd:[], even:[]};
for (var i=0; i<s.length-2; i+=2) {
o.odd.push(ds.readUint8());
o.even.push(ds.readUint8());
}
return o;
},
set: function(ds, v) {
for (var i=0; i<v.odd.length; i++) {
ds.writeUint8(v.odd[i]);
ds.writeUint8(v.even[i]);
}
}
},
'endNote', 'uint8'
];
var u4 = [0,8,1,2,3,4,5,6,255];
var ds4 = new DataStream(new Uint8Array(u4));
var o4 = ds4.readStruct(def4);
assertEqual(o4.length, 8);
assertEqual(o4.endNote, 255);
assertEqualArray(o4.data.odd, [1,3,5]);
assertEqualArray(o4.data.even, [2,4,6]);
var pos = ds4.position;
ds4.writeStruct(def4, o4);
ds4.seek(pos);
var o4b = ds4.readStruct(def4);
assertEqual(JSON.stringify(o4), JSON.stringify(o4b));
assertEqualArray(u4.concat(u4), new Uint8Array(ds4.buffer));
/* Test variable-length string definition */
var def5 = [
'len', 'uint8',
'greet', 'cstring:len',
'pad', 'string:2',
'len2', 'uint8',
'greet2', 'string:len2',
'tail', [[], 'uint8', '*']
];
var u5 = [5,
72, 101, 108, 108, 111, // "Hello"
44, 32, // ", "
6,
87, 111, 114, 108, 100, 33, // "World!"
0, 0, 0, 0, 0, 0, 0, 255];
var ds5 = new DataStream();
ds5.writeUint8Array(u5);
ds5.seek(0);
var o5 = ds5.readStruct(def5);
assertEqual(o5.len, o5.greet.length);
assertEqual('Hello', o5.greet);
assertEqual(', ', o5.pad);
assertEqual(o5.len2, o5.greet2.length);
assertEqual('World!', o5.greet2);
assertEqualArray([0,0,0,0,0,0,0,255], o5.tail);
};
test_constructor();
if (DataStream.endianness != DataStream.LITTLE_ENDIAN && DataStream.endianness != DataStream.BIG_ENDIAN) {
throw("Err, DataStream.endianness should be DataStream.LITTLE_ENDIAN or DataStream.BIG_ENDIAN");
}
var buf = new ArrayBuffer(1064);
var ds = new DataStream(buf, 64);
assertEqual(ds.byteLength+64, buf.byteLength);
ds.endianness = DataStream.LITTLE_ENDIAN;
ds.writeUint16(1);
ds.seek(0);
var a = ds.readUint8Array(2);
assertEqual(a[0], 1);
assertEqual(a[1], 0);
ds.seek(0);
ds.endianness = DataStream.BIG_ENDIAN;
ds.writeUint16(1);
ds.seek(0);
var a = ds.readUint8Array(2);
assertEqual(a[0], 0);
assertEqual(a[1], 1);
ds.seek(0);
ds.endianness = DataStream.LITTLE_ENDIAN;
for (var i = 0; i < 1000 / 8; i++) {
ds.writeFloat64(0.125);
}
assertEqual(ds.position+64 , buf.byteLength);
assertEqual(ds.byteLength+64 , buf.byteLength);
assertEqual(ds.buffer.byteLength , buf.byteLength);
ds.seek(0);
for (var i = 0; i < 1000 / 8; i++) {
assertEqual(0.125 , ds.readFloat64());
}
assertEqual(ds.position+64 , buf.byteLength);
assertFail(function() {
ds.readFloat32();
});
ds.seek(0);
ds.endianness = DataStream.BIG_ENDIAN;
for (var i = 0; i < 1000 / 8; i++) {
assertNotEqual(0.125, ds.readFloat64());
}
ds.seek(0);
for (var i = 0; i < 999; i++) {
ds.writeFloat32(0.125);
}
// reading beyond extended buffer succeeds for performance reasons
ds.readFloat32();
assertEqual(ds.position , 4000);
assertEqual(ds.byteLength , 3996);
assertEqual(ds.buffer.byteLength , 3996+64);
ds.position = 3996;
// but fails after getting buffer due to _trimAlloc
assertFail(function() {
ds.readFloat32();
});
ds.seek(0);
for (var i = 0; i < 999; i++) {
assertEqual(0.125 , ds.readFloat32());
}
assertEqual(ds.position+64 , ds.buffer.byteLength);
ds.writeFloat32(0.125);
ds.dynamicSize = false;
assertFail(function() {
ds.writeFloat32(0.125);
});
assertEqual(ds.position , 4000);
assertEqual(ds.byteLength , 4000);
assertEqual(ds.buffer.byteLength , ds.position+64);
testType(ds, 'Int32', 4);
testType(ds, 'Int16', 2);
testType(ds, 'Int8', 1);
testType(ds, 'Uint32', 4);
testType(ds, 'Uint16', 2);
testType(ds, 'Uint8', 1);
testType(ds, 'Float32', 4);
testType(ds, 'Float64', 8);
ds = new DataStream(buf, 7);
testType(ds, 'Int32', 4);
testType(ds, 'Int16', 2);
testType(ds, 'Int8', 1);
testType(ds, 'Uint32', 4);
testType(ds, 'Uint16', 2);
testType(ds, 'Uint8', 1);
testType(ds, 'Float32', 4);
testType(ds, 'Float64', 8);
testStruct();
var s = "Hello, 世界";
var dss = new DataStream();
dss.writeUCS2String(s);
dss.seek(0);
assertEqual(s, dss.readUCS2String(s.length));
var s = "Exif\000\000";
var dss = new DataStream();
dss.writeString(s);
dss.seek(0);
assertEqual(s, dss.readString(s.length));
var dss = new DataStream();
var s = "Hello, World!";
dss.writeCString(s);
assertEqual(dss.byteLength, s.length + 1);
dss.seek(0);
assertEqual(s, dss.readCString());
var dp = dss.position;
dss.writeCString(s,s.length); // no zero terminate
dss.seek(dp);
assertEqual(s, dss.readCString());
dss.writeCString(s,s.length); // no zero terminate
dss.seek(dp);
assertEqual(s, dss.readCString(s.length));
dss.buffer;
assertEqual(s, dss.readCString());
var dss = new DataStream();
var s = "Hello, 世界";
dss.writeString(s, 'UTF-8');
var bl = dss.byteLength;
dss.seek(0);
assertEqual(s, dss.readString(dss.byteLength, 'UTF-8'));
// ugh, byte-counted UTF-8 strings :(
var dss = new DataStream();
var s = "Hello, me";
dss.writeString(s, 'UTF-8');
assertNotEqual(bl, dss.byteLength);
dss.seek(0);
assertEqual(s, dss.readString(dss.byteLength, 'UTF-8'));
var p = document.createElement('p');
p.textContent = 'tests passed';
document.body.appendChild(p);
console.log('tests passed');
</script>
</html>