src/third_party/web_platform_tests/FileAPI/reading-data-section/Determining-Encoding.html

<!DOCTYPE html>
<meta charset=utf-8>
<title>FileAPI Test: Blob Determining Encoding</title>
<link ref="author" title="march1993" href="mailto:march511@gmail.com">
<link rel=help href="http://dev.w3.org/2006/webapi/FileAPI/#enctype">
<link rel=help href="http://encoding.spec.whatwg.org/#decode">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id="log"></div>
<script>
var t = async_test("Blob Determing Encoding with encoding argument");
t.step(function() {
    // string 'hello'
    var data = [0xFE,0xFF,0x00,0x68,0x00,0x65,0x00,0x6C,0x00,0x6C,0x00,0x6F];
    var blob = new Blob([new Uint8Array(data)]);
    var reader = new FileReader();

    reader.onloadend = t.step_func_done (function(event) {
        assert_equals(this.result, "hello", "The FileReader should read the ArrayBuffer through UTF-16BE.")
    }, reader);

    reader.readAsText(blob, "UTF-16BE");
});

var t = async_test("Blob Determing Encoding with type attribute");
t.step(function() {
    var data = [0xFE,0xFF,0x00,0x68,0x00,0x65,0x00,0x6C,0x00,0x6C,0x00,0x6F];
    var blob = new Blob([new Uint8Array(data)], {type:"text/plain;charset=UTF-16BE"});
    var reader = new FileReader();

    reader.onloadend = t.step_func_done (function(event) {
        assert_equals(this.result, "hello", "The FileReader should read the ArrayBuffer through UTF-16BE.")
    }, reader);

    reader.readAsText(blob);
});


var t = async_test("Blob Determing Encoding with UTF-8 BOM");
t.step(function() {
    var data = [0xEF,0xBB,0xBF,0x68,0x65,0x6C,0x6C,0xC3,0xB6];
    var blob = new Blob([new Uint8Array(data)]);
    var reader = new FileReader();

    reader.onloadend = t.step_func_done (function(event) {
        assert_equals(this.result, "hellö", "The FileReader should read the blob with UTF-8.");
    }, reader);

    reader.readAsText(blob);
});

var t = async_test("Blob Determing Encoding without anything implying charset.");
t.step(function() {
    var data = [0x68,0x65,0x6C,0x6C,0xC3,0xB6];
    var blob = new Blob([new Uint8Array(data)]);
    var reader = new FileReader();

    reader.onloadend = t.step_func_done (function(event) {
        assert_equals(this.result, "hellö", "The FileReader should read the blob by default with UTF-8.");
    }, reader);

    reader.readAsText(blob);
});

var t = async_test("Blob Determing Encoding with UTF-16BE BOM");
t.step(function() {
    var data = [0xFE,0xFF,0x00,0x68,0x00,0x65,0x00,0x6C,0x00,0x6C,0x00,0x6F];
    var blob = new Blob([new Uint8Array(data)]);
    var reader = new FileReader();

    reader.onloadend = t.step_func_done (function(event) {
        assert_equals(this.result, "hello", "The FileReader should read the ArrayBuffer through UTF-16BE.");
    }, reader);

    reader.readAsText(blob);
});

var t = async_test("Blob Determing Encoding with UTF-16LE BOM");
t.step(function() {
    var data = [0xFF,0xFE,0x68,0x00,0x65,0x00,0x6C,0x00,0x6C,0x00,0x6F,0x00];
    var blob = new Blob([new Uint8Array(data)]);
    var reader = new FileReader();

    reader.onloadend = t.step_func_done (function(event) {
        assert_equals(this.result, "hello", "The FileReader should read the ArrayBuffer through UTF-16LE.");
    }, reader);

    reader.readAsText(blob);
});

</script>