gecko/intl/uconv/tests/unit/test_bug317216.js

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/* Test case for bug 317216
*
* Uses nsIConverterInputStream to decode UTF-16 text with valid surrogate
* pairs and lone surrogate characters
*
* Sample text is: "A" in Mathematical Bold Capitals (U+1D400)
*
* The test uses buffers of 4 different lengths to test end of buffer in mid-
* UTF16 character and mid-surrogate pair
*/
const test = [
// 0: Valid surrogate pair
["%00%2D%00%2D%D8%35%DC%20%00%2D%00%2D",
// expected: surrogate pair
"--\uD835\uDC20--"],
// 1: Lone high surrogate
["%00%2D%00%2D%D8%35%00%2D%00%2D",
// expected: one replacement char
"--\uFFFD--"],
// 2: Lone low surrogate
["%00%2D%00%2D%DC%20%00%2D%00%2D",
// expected: one replacement char
"--\uFFFD--"],
// 3: Two high surrogates
["%00%2D%00%2D%D8%35%D8%35%00%2D%00%2D",
// expected: two replacement chars
"--\uFFFD\uFFFD--"],
// 4: Two low surrogates
["%00%2D%00%2D%DC%20%DC%20%00%2D%00%2D",
// expected: two replacement chars
"--\uFFFD\uFFFD--"],
// 5: Low surrogate followed by high surrogate
["%00%2D%00%2D%DC%20%D8%35%00%2D%00%2D",
// expected: two replacement chars
"--\uFFFD\uFFFD--"],
// 6: Lone high surrogate followed by valid surrogate pair
["%00%2D%00%2D%D8%35%D8%35%DC%20%00%2D%00%2D",
// expected: replacement char followed by surrogate pair
"--\uFFFD\uD835\uDC20--"],
// 7: Lone low surrogate followed by valid surrogate pair
["%00%2D%00%2D%DC%20%D8%35%DC%20%00%2D%00%2D",
// expected: replacement char followed by surrogate pair
"--\uFFFD\uD835\uDC20--"],
// 8: Valid surrogate pair followed by lone high surrogate
["%00%2D%00%2D%D8%35%DC%20%D8%35%00%2D%00%2D",
// expected: surrogate pair followed by replacement char
"--\uD835\uDC20\uFFFD--"],
// 9: Valid surrogate pair followed by lone low surrogate
["%00%2D%00%2D%D8%35%DC%20%DC%20%00%2D%00%2D",
// expected: surrogate pair followed by replacement char
"--\uD835\uDC20\uFFFD--"],
// 10: Lone high surrogate at the end of the input
["%00%2D%00%2D%00%2D%00%2D%D8%35%",
// expected: nothing
"----"],
// 11: Half code unit at the end of the input
["%00%2D%00%2D%00%2D%00%2D%D8",
// expected: nothing
"----"]];
const IOService = Components.Constructor("@mozilla.org/network/io-service;1",
"nsIIOService");
const ConverterInputStream =
Components.Constructor("@mozilla.org/intl/converter-input-stream;1",
"nsIConverterInputStream",
"init");
const ios = new IOService();
function testCase(testText, expectedText, bufferLength, charset)
{
var dataURI = "data:text/plain;charset=" + charset + "," + testText;
var channel = ios.newChannel(dataURI, "", null);
var testInputStream = channel.open();
var testConverter = new ConverterInputStream(testInputStream,
charset,
bufferLength,
0xFFFD);
if (!(testConverter instanceof
Components.interfaces.nsIUnicharLineInputStream))
throw "not line input stream";
var outStr = "";
var more;
do {
// read the line and check for eof
var line = {};
more = testConverter.readLine(line);
outStr += line.value;
} while (more);
// escape the strings before comparing for better readability
do_check_eq(escape(outStr), escape(expectedText));
}
// Byte-swap %-encoded utf-16
function flip(str) { return str.replace(/(%..)(%..)/g, "$2$1"); }
function run_test()
{
for (var i = 0; i < 12; ++i) {
for (var bufferLength = 4; bufferLength < 8; ++ bufferLength) {
testCase(test[i][0], test[i][1], bufferLength, "UTF-16BE");
testCase(flip(test[i][0]), test[i][1], bufferLength, "UTF-16LE");
}
}
}