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check UTF-8 in separate chunks, since running a regexp on too much data produces an error

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This commit is contained in:
Simon Kornblith 2010-12-12 07:16:00 +00:00
parent 071c05e0bb
commit e01aa91e49
1 changed files with 30 additions and 26 deletions
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42
chrome/content/zotero/xpcom/translation/browser_firefox.js
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@ -110,15 +110,10 @@ Zotero.Translate.IO.Read = function(file, mode) {
var charset = null;
// look for a BOM in the document
if(Zotero.isFx4) {
var first4 = NetUtil.readInputStreamToString(this._rawStream, 4);
} else {
var binStream = Components.classes["@mozilla.org/binaryinputstream;1"].
createInstance(Components.interfaces.nsIBinaryInputStream);
binStream.setInputStream(this._rawStream);
var first4 = binStream.readByteArray(4);
first4 = String.fromCharCode.apply(null, first4);
}
var first4 = binStream.readBytes(4);
for(var possibleCharset in BOMs) {
if(first4.substr(0, BOMs[possibleCharset].length) == BOMs[possibleCharset]) {
@ -184,6 +179,7 @@ Zotero.Translate.IO.Read = function(file, mode) {
// Check whether the user has specified a charset preference
var charsetPref = Zotero.Prefs.get("import.charset");
if(charsetPref == "auto") {
Zotero.debug("Translate: Checking whether file is UTF-8");
// For auto-detect, we are basically going to check if the file could be valid
// UTF-8, and if this is true, we will treat it as UTF-8. Prior likelihood of
// UTF-8 is very high, so this should be a reasonable strategy.
@ -205,27 +201,35 @@ Zotero.Translate.IO.Read = function(file, mode) {
// Read all currently available bytes from file. I'm not sure how many this is
// but it's a safe bet that we don't want to try to read any more than this, since
// it would slow things down considerably.
if(Zotero.isFx4) {
var fileContents = NetUtil.readInputStreamToString(this._rawStream, this._rawStream.available());
} else {
var fileContents = binStream.readByteArray(this._rawStream.available());
fileContents = String.fromCharCode.apply(null, fileContents);
this._charset = "UTF-8";
let bytesAvailable;
while(bytesAvailable = this._rawStream.available()) {
// read 131072 bytes
let fileContents = binStream.readBytes(Math.min(131072, bytesAvailable));
// on failure, try reading up to 3 more bytes and see if that makes this
// valid (since we have chunked it)
let isUTF8;
for(let i=1; !(isUTF8 = UTF8Regex.test(fileContents)) && i <= 3; i++) {
if(this._rawStream.available()) {
fileContents += binStream.readBytes(1);
}
}
// Seek back to beginning of file
this._seekToStart();
// See whether this could be UTF-8
if(UTF8Regex.test(fileContents)) {
// Assume this is UTF-8
this._charset = "UTF-8";
} else {
// if the regexp continues to fail, this is not UTF-8
if(!isUTF8) {
// Can't be UTF-8; see if a default charset is defined
this._charset = Zotero.Prefs.get("intl.charset.default", true);
// ISO-8859-1 by default
if(!this._charset) this._charset = "ISO-8859-1";
break;
}
}
// Seek back to beginning of file
this._seekToStart();
} else {
// No need to auto-detect; user has specified a charset
this._charset = charsetPref;