The Tor Browser: intl/uconv/tests/unit/test_charset_conversion.js@97036ab72558 (annotated)

intl/uconv/tests/unit/test_charset_conversion.js@97036ab72558 (annotated)

intl/uconv/tests/unit/test_charset_conversion.js

Tue, 06 Jan 2015 21:39:09 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Tue, 06 Jan 2015 21:39:09 +0100
branch: TOR_BUG_9701
changeset 8: 97036ab72558
permissions: -rw-r--r--

Conditionally force memory storage according to privacy.thirdparty.isolate;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.

 const Cc = Components.classes;
 const Ci = Components.interfaces;
 const NS_ERROR_ILLEGAL_VALUE = Components.results.NS_ERROR_ILLEGAL_VALUE;
 var BIS, BOS, _Pipe, COS, FIS, _SS, CIS;
 var dataDir;
 function run_test()
 {
   BIS = Components.Constructor("@mozilla.org/binaryinputstream;1",
                                "nsIBinaryInputStream",
                                "setInputStream");
   BOS = Components.Constructor("@mozilla.org/binaryoutputstream;1",
                                "nsIBinaryOutputStream",
                                "setOutputStream");
   _Pipe = Components.Constructor("@mozilla.org/pipe;1",
                                  "nsIPipe",
                                  "init");
   COS = Components.Constructor("@mozilla.org/intl/converter-output-stream;1",
                                "nsIConverterOutputStream",
                                "init");
   FIS = Components.Constructor("@mozilla.org/network/file-input-stream;1",
                                "nsIFileInputStream",
                                "init");
   _SS = Components.Constructor("@mozilla.org/storagestream;1",
                                "nsIStorageStream",
                                "init");
   CIS = Components.Constructor("@mozilla.org/intl/converter-input-stream;1",
                                "nsIConverterInputStream",
                                "init");
   dataDir = do_get_file("data/");
   test_utf8_1();
   test_utf16_1();
   test_utf16_2();
   test_utf16_3();
   test_cross_conversion();
 }
 const UNICODE_STRINGS =
   [
     '\u00BD + \u00BE == \u00BD\u00B2 + \u00BC + \u00BE',
     'AZaz09 \u007F ' +               // U+000000 to U+00007F
     '\u0080 \u0398 \u03BB \u0725 ' + // U+000080 to U+0007FF
     '\u0964 \u0F5F \u20AC \uFFFB'    // U+000800 to U+00FFFF
     // there would be strings containing non-BMP code points here, but
     // unfortunately JS strings are UCS-2 (and worse yet are treated as
     // 16-bit values by the spec), so we have to do gymnastics to work
     // with non-BMP -- manual surrogate decoding doesn't work because
     // String.prototype.charCodeAt() ignores surrogate pairs and only
     // returns 16-bit values
   ];
 // test conversion equality -- keys are names of files containing equivalent
 // Unicode data, values are the encoding of the file in the format expected by
 // nsIConverter(In|Out)putStream.init
 const UNICODE_FILES =
   {
     "unicode-conversion.utf8.txt":            "UTF-8",
     "unicode-conversion.utf16.txt":           "UTF-16",
     "unicode-conversion.utf16le.txt":         "UTF-16LE",
     "unicode-conversion.utf16be.txt":         "UTF-16BE"
   };
 function test_utf8_1()
 {
   for (var i = 0; i < UNICODE_STRINGS.length; i++)
   {
     var pipe = Pipe();
     var conv = new COS(pipe.outputStream, "UTF-8", 1024, 0x0);
     do_check_true(conv.writeString(UNICODE_STRINGS[i]));
     conv.close();
     if (!equal(new UTF8(pipe.inputStream),
                stringToCodePoints(UNICODE_STRINGS[i])))
       do_throw("UNICODE_STRINGS[" + i + "] not handled correctly");
   }
 }
 function test_utf16_1()
 {
   for (var i = 0; i < UNICODE_STRINGS.length; i++)
   {
     var pipe = Pipe();
     var conv = new COS(pipe.outputStream, "UTF-16", 1024, 0x0);
     do_check_true(conv.writeString(UNICODE_STRINGS[i]));
     conv.close();
     if (!equal(new UTF16(pipe.inputStream),
                stringToCodePoints(UNICODE_STRINGS[i])))
       do_throw("UNICODE_STRINGS[" + i + "] not handled correctly");
   }
 }
 function test_utf16_2()
 {
   for (var i = 0; i < UNICODE_STRINGS.length; i++)
   {
     var pipe = Pipe();
     var conv = new COS(pipe.outputStream, "UTF-16LE", 1024, 0x0);
     do_check_true(conv.writeString(UNICODE_STRINGS[i]));
     conv.close();
     if (!equal(new UTF16(pipe.inputStream, false),
                stringToCodePoints(UNICODE_STRINGS[i])))
       do_throw("UNICODE_STRINGS[" + i + "] not handled correctly");
   }
 }
 function test_utf16_3()
 {
   for (var i = 0; i < UNICODE_STRINGS.length; i++)
   {
     var pipe = Pipe();
     var conv = new COS(pipe.outputStream, "UTF-16BE", 1024, 0x0);
     do_check_true(conv.writeString(UNICODE_STRINGS[i]));
     conv.close();
     if (!equal(new UTF16(pipe.inputStream, true),
                stringToCodePoints(UNICODE_STRINGS[i])))
       do_throw("UNICODE_STRINGS[" + i + "] not handled correctly");
   }
 }
 function test_cross_conversion()
 {
   for (var fn1 in UNICODE_FILES)
   {
     var fin = getBinaryInputStream(fn1);
     var ss = StorageStream();
     var bos = new BOS(ss.getOutputStream(0));
     var av;
     while ((av = fin.available()) > 0)
     {
       var data = fin.readByteArray(av);
       bos.writeByteArray(data, data.length);
     }
     fin.close();
     bos.close();
     for (var fn2 in UNICODE_FILES)
     {
       var fin2 = getUnicharInputStream(fn2, UNICODE_FILES[fn2]);
       var unichar = new CIS(ss.newInputStream(0),
                             UNICODE_FILES[fn1], 8192, 0x0);
       if (!equalUnicharStreams(unichar, fin2))
         do_throw("unequal streams: " +
                  UNICODE_FILES[fn1] + ", " +
                  UNICODE_FILES[fn2]);
     }
   }
 }
 // utility functions
 function StorageStream()
 {
   return new _SS(8192, Math.pow(2, 32) - 1, null);
 }
 function getUnicharInputStream(filename, encoding)
 {
   var file = dataDir.clone();
   file.append(filename);
   const PR_RDONLY = 0x1;
   var fis = new FIS(file, PR_RDONLY, 0644, Ci.nsIFileInputStream.CLOSE_ON_EOF);
   return new CIS(fis, encoding, 8192, 0x0);
 }
 function getBinaryInputStream(filename, encoding)
 {
   var file = dataDir.clone();
   file.append(filename);
   const PR_RDONLY = 0x1;
   var fis = new FIS(file, PR_RDONLY, 0644, Ci.nsIFileInputStream.CLOSE_ON_EOF);
   return new BIS(fis);
 }
 function equal(stream, codePoints)
 {
   var sz, currIndex = 0;
   while (true)
   {
     var unit = stream.readUnit();
     if (unit < 0)
       return currIndex == codePoints.length;
     if (unit !== codePoints[currIndex++])
       return false;
   }
   do_throw("not reached");
   return false;
 }
 function equalUnicharStreams(s1, s2)
 {
   var r1, r2;
   var str1 = {}, str2 = {};
   while (true)
   {
     r1 = s1.readString(1024, str1);
     r2 = s2.readString(1024, str2);
     if (r1 != r2 || str1.value != str2.value)
     {
       print("r1: " + r1 + ", r2: " + r2);
       print(str1.value.length);
       print(str2.value.length);
       return false;
     }
     if (r1 == 0 && r2 == 0)
       return true;
   }
   // not reached
   return false;
 }
 function stringToCodePoints(str)
 {
   return str.split('').map(function(v){ return v.charCodeAt(0); });
 }
 function lowbits(n)
 {
   return Math.pow(2, n) - 1;
 }
 function Pipe()
 {
   return new _Pipe(false, false, 1024, 10, null);
 }
 // complex charset readers
 /**
  * Wraps a UTF-8 stream to allow access to the Unicode code points in it.
  *
  * @param stream
  *   the stream to wrap
  */
 function UTF8(stream)
 {
   this._stream = new BIS(stream);
 }
 UTF8.prototype =
   {
     // returns numeric code point at front of stream encoded in UTF-8, -1 if at
     // end of stream, or throws if valid (and properly encoded!) code point not
     // found
     readUnit: function()
     {
       var str = this._stream;
       var c, c2, c3, c4, rv;
       // if at end of stream, must distinguish failure to read any bytes
       // (correct behavior) from failure to read some byte after the first
       // in the character
       try
       {
         c = str.read8();
       }
       catch (e)
       {
         return -1;
       }
       if (c < 0x80)
         return c;
       if (c < 0xC0) // c < 11000000
       {
         // byte doesn't have enough leading ones (must be at least two)
         throw NS_ERROR_ILLEGAL_VALUE;
       }
       c2 = str.read8();
       if (c2 >= 0xC0 || c2 < 0x80)
         throw NS_ERROR_ILLEGAL_VALUE; // not 10xxxxxx
       if (c < 0xE0) // c < 11100000
       {
         // two-byte between U+000080 and U+0007FF
         rv = ((lowbits(5) & c) << 6) +
               (lowbits(6) & c2);
         // no upper bounds-check needed, by previous lines
         if (rv >= 0x80)
           return rv;
         throw NS_ERROR_ILLEGAL_VALUE;
       }
       c3 = str.read8();
       if (c3 >= 0xC0 || c3 < 0x80)
         throw NS_ERROR_ILLEGAL_VALUE; // not 10xxxxxx
       if (c < 0xF0) // c < 11110000
       {
         // three-byte between U+000800 and U+00FFFF
         rv = ((lowbits(4) & c)  << 12) +
              ((lowbits(6) & c2) <<  6) +
               (lowbits(6) & c3);
         // no upper bounds-check needed, by previous lines
         if (rv >= 0xE000 ||
             (rv >= 0x800 && rv <= 0xD7FF))
           return rv;
         throw NS_ERROR_ILLEGAL_VALUE;
       }
       c4 = str.read8();
       if (c4 >= 0xC0 || c4 < 0x80)
         throw NS_ERROR_ILLEGAL_VALUE; // not 10xxxxxx
       if (c < 0xF8) // c < 11111000
       {
         // four-byte between U+010000 and U+10FFFF
         rv = ((lowbits(3) & c)  << 18) +
              ((lowbits(6) & c2) << 12) +
              ((lowbits(6) & c3) <<  6) +
               (lowbits(6) & c4);
         // need an upper bounds-check since 0x10FFFF isn't (2**n - 1)
         if (rv >= 0x10000 && rv <= 0x10FFFF)
           return rv;
         throw NS_ERROR_ILLEGAL_VALUE;
       }
       // 11111000 or greater -- no UTF-8 mapping
       throw NS_ERROR_ILLEGAL_VALUE;
     }
   };
 /**
  * Wraps a UTF-16 stream to allow access to the Unicode code points in it.
  *
  * @param stream
  *   the stream to wrap
  * @param bigEndian
  *   true for UTF-16BE, false for UTF-16LE, not present at all for UTF-16 with
  *   a byte-order mark
  */
 function UTF16(stream, bigEndian)
 {
   this._stream = new BIS(stream);
   if (arguments.length > 1)
   {
     this._bigEndian = bigEndian;
   }
   else
   {
     var bom = this._stream.read16();
     if (bom == 0xFEFF)
       this._bigEndian = true;
     else if (bom == 0xFFFE)
       this._bigEndian = false;
     else
       do_throw("missing BOM: " + bom.toString(16).toUpperCase());
   }
 }
 UTF16.prototype =
   {
     // returns numeric code point at front of stream encoded in UTF-16,
     // -1 if at end of stream, or throws if UTF-16 code point not found
     readUnit: function()
     {
       var str = this._stream;
       // if at end of stream, must distinguish failure to read any bytes
       // (correct behavior) from failure to read some byte after the first
       // in the character
       try
       {
         var b1 = str.read8();
       }
       catch (e)
       {
         return -1;
       }
       var b2 = str.read8();
       var w1 = this._bigEndian
              ? (b1 << 8) + b2
              : (b2 << 8) + b1;
       if (w1 > 0xDBFF && w1 < 0xE000)
       {
         // second surrogate, but expecting none or first
         throw NS_ERROR_ILLEGAL_VALUE;
       }
       if (w1 > 0xD7FF && w1 < 0xDC00)
       {
         // non-BMP, use surrogate pair
         b1 = str.read8();
         b2 = str.read8();
         var w2 = this._bigEndian
                ? (b1 << 8) + b2
                : (b2 << 8) + b1;
         if (w2 < 0xDC00 || w2 > 0xDFFF)
           throw NS_ERROR_ILLEGAL_VALUE;
         var rv = 0x100000 +
                  ((lowbits(10) & w2) << 10) +
                   (lowbits(10) & w1);
         if (rv <= 0x10FFFF)
           return rv;
         throw NS_ERROR_ILLEGAL_VALUE;
       }
       // non-surrogate
       return w1;
     }
   };