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It happens that bzip2 decompression fails with "No magic number found". It's known bug, not yet solved. When this happens, we should not ask the user to report it, but instead invite him to see the corresponding issue on Github. Fixes #77

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+ slightly improve the way we report other decompression errors to the user
This commit is contained in:
mossroy 2014-04-01 11:40:23 +02:00
parent 4cb3486cd7
commit 75c7c8a218
2 changed files with 48 additions and 48 deletions
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1
www/js/app.js
View File

@ -499,6 +499,7 @@ define(function(require) {
/**
* Display the the given HTML article in the web page,
* and convert links to javascript calls
* NB : in some error cases, the given title can be null, and the htmlArticle contains the error message
* @param {type} title
* @param {type} htmlArticle
*/

95
www/js/lib/archive.js
View File

@ -473,54 +473,53 @@ define(function(require) {
alert('Data file read cancelled');
};
reader.onload = function(e) {
try {
var compressedArticles = e.target.result;
webworkerBzip2.onerror = function(event){
// TODO can probably be replaced by some error handler at window level
alert("An unexpected error occured during bzip2 decompression. Please report it to us by email or through Github (see About section), with the names of the archive and article, and the following info : message="
+ event.message + " filename=" + event.filename + " line number=" + event.lineno );
throw new Error("Error during bzip2 decompression : " + event.message + " (" + event.filename + ":" + event.lineno + ")");
};
webworkerBzip2.onmessage = function(event){
switch (event.data.cmd){
case "result":
var htmlArticles = event.data.msg;
// Start reading at offset, and keep length characters
var htmlArticle = htmlArticles.substring(title._blockOffset,
title._blockOffset + title._articleLength);
if (htmlArticle.length >= title._articleLength) {
// Keep only length characters
htmlArticle = htmlArticle.substring(0, title._articleLength);
// Decode UTF-8 encoding
htmlArticle = decodeURIComponent(escape(htmlArticle));
callbackFunction(title, htmlArticle);
} else {
// TODO : throw exception if we reach the end of the file
currentLocalArchiveInstance.readArticleChunk(title, dataFile, reader, readLength + CHUNK_SIZE,
callbackFunction);
}
break;
case "recurse":
currentLocalArchiveInstance.readArticleChunk(title, dataFile, reader, readLength + CHUNK_SIZE, callbackFunction);
break;
case "debug":
console.log(event.data.msg);
break;
case "error":
// TODO can probably be replaced by some error handler at window level
alert("An unexpected error occured during bzip2 decompression. Please report it to us by email or through Github (see About section), with the names of the archive and article, and the following info : message="
+ event.data.msg );
throw new Error("Error during bzip2 decompression : " + event.data.msg);
break;
}
};
webworkerBzip2.postMessage({cmd : 'uncompress', msg :
new Uint8Array(compressedArticles)});
}
catch (e) {
callbackFunction("Error : " + e);
}
var compressedArticles = e.target.result;
webworkerBzip2.onerror = function(event){
// TODO can probably be replaced by some error handler at window level
callbackFunction(null, "An unexpected error occured during bzip2 decompression. Please report it to us by email or through Github (see About section), with the names of the archive and article, and the following info : message="
+ event.message + " filename=" + event.filename + " line number=" + event.lineno);
};
webworkerBzip2.onmessage = function(event){
switch (event.data.cmd){
case "result":
var htmlArticles = event.data.msg;
// Start reading at offset, and keep length characters
var htmlArticle = htmlArticles.substring(title._blockOffset,
title._blockOffset + title._articleLength);
if (htmlArticle.length >= title._articleLength) {
// Keep only length characters
htmlArticle = htmlArticle.substring(0, title._articleLength);
// Decode UTF-8 encoding
htmlArticle = decodeURIComponent(escape(htmlArticle));
callbackFunction(title, htmlArticle);
} else {
// TODO : throw exception if we reach the end of the file
currentLocalArchiveInstance.readArticleChunk(title, dataFile, reader, readLength + CHUNK_SIZE,
callbackFunction);
}
break;
case "recurse":
currentLocalArchiveInstance.readArticleChunk(title, dataFile, reader, readLength + CHUNK_SIZE, callbackFunction);
break;
case "debug":
console.log(event.data.msg);
break;
case "error":
// TODO can probably be replaced by some error handler at window level
if (event.data.msg === "No magic number found") {
// See https://github.com/mossroy/evopedia-html5/issues/77
// It's a temporary workaround until https://github.com/mossroy/evopedia-html5/issues/6 is fixed
callbackFunction(null, "Oops : this article can not be displayed for now. It's a known bug that is not solved yet. See <a href='https://github.com/mossroy/evopedia-html5/issues/6' target='_blank'>issue #6 on Github</a> for more info");
}
else {
callbackFunction(null, "An unexpected error occured during bzip2 decompression. Please report it to us by email or through Github (see About section), with the names of the archive and article, and the following info : message="
+ event.data.msg);
}
break;
}
};
webworkerBzip2.postMessage({cmd : 'uncompress', msg :
new Uint8Array(compressedArticles)});
};
var blob = dataFile.slice(title._blockStart, title._blockStart
+ readLength);