Sakurai/pdf.js
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Add an ensureRange() call to ChunkedStream_makeSubStream().

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By checking if the data is all present before making a substream, we avoid
cases where we parse part of a stream and then throw a MissingDataException
part-way through, which forces us to later re-read the stream -- possibly
multiple times. This is a sizeable performance win for some cases when file
loading is slow (e.g. over the web).
This commit is contained in:
Nicholas Nethercote 2014-03-06 16:14:21 -08:00
parent 57e896d29e
commit f12d588258
1 changed files with 2 additions and 0 deletions
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src/core/chunked_stream.js
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@ -187,6 +187,8 @@ var ChunkedStream = (function ChunkedStreamClosure() {
}, },
makeSubStream: function ChunkedStream_makeSubStream(start, length, dict) { makeSubStream: function ChunkedStream_makeSubStream(start, length, dict) {
this.ensureRange(start, start + length);
function ChunkedStreamSubstream() {} function ChunkedStreamSubstream() {}
ChunkedStreamSubstream.prototype = Object.create(this); ChunkedStreamSubstream.prototype = Object.create(this);
ChunkedStreamSubstream.prototype.getMissingChunks = function() { ChunkedStreamSubstream.prototype.getMissingChunks = function() {