text: // META: title=Encoding API: Streaming decode
  // META: global=window,worker
  // META: script=resources/encodings.js
  // META: script=/common/sab.js
  
  var string = '\x00123ABCabc\x80\xFF\u0100\u1000\uFFFD\uD800\uDC00\uDBFF\uDFFF';
  var octets = {
      'utf-8':    [0x00,0x31,0x32,0x33,0x41,0x42,0x43,0x61,0x62,0x63,0xc2,0x80,
                   0xc3,0xbf,0xc4,0x80,0xe1,0x80,0x80,0xef,0xbf,0xbd,0xf0,0x90,
                   0x80,0x80,0xf4,0x8f,0xbf,0xbf],
      'utf-16le': [0x00,0x00,0x31,0x00,0x32,0x00,0x33,0x00,0x41,0x00,0x42,0x00,
                   0x43,0x00,0x61,0x00,0x62,0x00,0x63,0x00,0x80,0x00,0xFF,0x00,
                   0x00,0x01,0x00,0x10,0xFD,0xFF,0x00,0xD8,0x00,0xDC,0xFF,0xDB,
                   0xFF,0xDF],
      'utf-16be': [0x00,0x00,0x00,0x31,0x00,0x32,0x00,0x33,0x00,0x41,0x00,0x42,
                   0x00,0x43,0x00,0x61,0x00,0x62,0x00,0x63,0x00,0x80,0x00,0xFF,
                   0x01,0x00,0x10,0x00,0xFF,0xFD,0xD8,0x00,0xDC,0x00,0xDB,0xFF,
                   0xDF,0xFF]
  };
  
  ["ArrayBuffer", "SharedArrayBuffer"].forEach((arrayBufferOrSharedArrayBuffer) => {
      Object.keys(octets).forEach(function(encoding) {
          for (var len = 1; len <= 5; ++len) {
              test(function() {
                  var encoded = octets[encoding];
  
                  var out = '';
                  var decoder = new TextDecoder(encoding);
                  for (var i = 0; i < encoded.length; i += len) {
                      var sub = [];
                      for (var j = i; j < encoded.length && j < i + len; ++j) {
                          sub.push(encoded[j]);
                      }
                      var uintArray = new Uint8Array(createBuffer(arrayBufferOrSharedArrayBuffer, sub.length));
                      uintArray.set(sub);
                      out += decoder.decode(uintArray, {stream: true});
                  }
                  out += decoder.decode();
                  assert_equals(out, string);
              }, 'Streaming decode: ' + encoding + ', ' + len + ' byte window (' + arrayBufferOrSharedArrayBuffer + ')');
          }
      });
  
      test(() => {
          function bytes(byteArray) {
              const view = new Uint8Array(createBuffer(arrayBufferOrSharedArrayBuffer, byteArray.length));
              view.set(byteArray);
              return view;
          }
  
          const decoder = new TextDecoder();
  
          assert_equals(decoder.decode(bytes([0xC1]), {stream: true}), "\uFFFD");
          assert_equals(decoder.decode(), "");
  
          assert_equals(decoder.decode(bytes([0xF5]), {stream: true}), "\uFFFD");
          assert_equals(decoder.decode(), "");
  
          assert_equals(decoder.decode(bytes([0xE0, 0x41]), {stream: true}), "\uFFFDA");
          assert_equals(decoder.decode(bytes([0x42])), "B");
  
          assert_equals(decoder.decode(bytes([0xE0, 0x80]), {stream: true}), "\uFFFD\uFFFD");
          assert_equals(decoder.decode(bytes([0x80])), "\uFFFD");
  
          assert_equals(decoder.decode(bytes([0xED, 0xA0]), {stream: true}), "\uFFFD\uFFFD");
          assert_equals(decoder.decode(bytes([0x80])), "\uFFFD");
  
          assert_equals(decoder.decode(bytes([0xF0, 0x41]), {stream: true}), "\uFFFDA");
          assert_equals(decoder.decode(bytes([0x42]), {stream: true}), "B");
          assert_equals(decoder.decode(bytes([0x43])), "C");
  
          assert_equals(decoder.decode(bytes([0xF0, 0x80]), {stream: true}), "\uFFFD\uFFFD");
          assert_equals(decoder.decode(bytes([0x80]), {stream: true}), "\uFFFD");
          assert_equals(decoder.decode(bytes([0x80])), "\uFFFD");
  
          assert_equals(decoder.decode(bytes([0xF4, 0xA0]), {stream: true}), "\uFFFD\uFFFD");
          assert_equals(decoder.decode(bytes([0x80]), {stream: true}), "\uFFFD");
          assert_equals(decoder.decode(bytes([0x80])), "\uFFFD");
  
          assert_equals(decoder.decode(bytes([0xF0, 0x90, 0x41]), {stream: true}), "\uFFFDA");
          assert_equals(decoder.decode(bytes([0x42])), "B");
  
          // 4-byte UTF-8 sequences always correspond to non-BMP characters. Here
          // we make sure that, although the first 3 bytes are enough to emit the
          // lead surrogate, it only gets emitted when the fourth byte is read.
          assert_equals(decoder.decode(bytes([0xF0, 0x9F, 0x92]), {stream: true}), "");
          assert_equals(decoder.decode(bytes([0xA9])), "\u{1F4A9}");
      }, `Streaming decode: UTF-8 chunk tests (${arrayBufferOrSharedArrayBuffer})`);
  })
  