FileWriter.append - Chinese characters are not appended to the file correctly
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Key: CB-453
URL: https://issues.apache.org/jira/browse/CB-453
Project: Apache Callback
Issue Type: Bug
Components: Android
Affects Versions: 1.5.0
Environment: test("should be able to write and append to file in
Chinese Traditional, createWriter", function() {
QUnit.stop(Tests.TEST_TIMEOUT);
expect(2);
var that = this,
fileName = "writer.chinese",
filePath = this.root.fullPath + '/' + fileName,
// file content
rule = "每個規則有一個例外。",
// for testing file length
length = rule.length,
// writes initial file content
write_file = function(fileEntry) {
fileEntry.createWriter(function(writer) {
writer.onwriteend = function(evt) {
// valid writing of non-ascii file was already
validated in previous test.
// Append to file to verify writer.length and
writer.position are set correctly
append_file(writer);
};
writer.write(rule);
}, that.fail);
},
// appends to file
append_file = function(writer) {
var exception = " 除了這一個";
writer.onwriteend = function(evt) {
// read back file to verify that data was appended
var reader = new FileReader();
reader.onloadend = function(evt) {
console.log("old: " + rule + exception);
console.log("new: " + evt.target.result);
console.log("old: " + length);
console.log("new: " + evt.target.result.length);
ok(evt.target.result === (rule + exception),
"reader.result after append should be equal to the text written.");
ok(evt.target.result.length === length, "reader.result
length should equal initial length.");
// cleanup
//that.deleteFile(fileName);
QUnit.start();
};
var myFile = new File();
myFile.fullPath = filePath;
reader.readAsText(myFile);
};
length += exception.length;
console.log("len: " + writer.length);
writer.seek(writer.length);
console.log("pos: " + writer.position);
writer.write(exception);
};
// create file, then write and append to it
this.createFile(fileName, write_file);
});
Reporter: Simon MacDonald
Assignee: Simon MacDonald
Fix For: 1.6.0
When Becky checked in her update to the automated file tests
(https://git-wip-us.apache.org/repos/asf?p=incubator-cordova-mobile-spec.git;a=commit;h=db377f9f2b4c5507b6eb1fcb8eb4fa029030cdef)
the test to check if you could append to a file that includes Chinese
characters started to fail. Apparently what we expect to be in the file is not
correct.
First write:
Expect - "每個規則有一個例外。"
Received - "每個規則有一個例外。"
After append:
Expect - "每個規則有一個例外。 除了這一個"
Received - "每個規? 除了這一個"
See environment section for the full test case.
The root cause of the problem is that the FileWriter.write method returns the
wrong number of bytes written for multi-byte language strings like Chinese
characters.
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