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Initial JBIG2 code

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This commit is contained in:
Yury Delendik 2012-06-16 15:15:42 -05:00
parent 2aae4fd001
commit 95bc99f698
5 changed files with 561 additions and 1 deletions
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37
src/stream.js
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@ -979,6 +979,43 @@ var JpxStream = (function JpxStreamClosure() {
return JpxStream;
})();
/**
* For JBIG2's we use a library to decode these images and
* the stream behaves like all the other DecodeStreams.
*/
var Jbig2Stream = (function Jbig2StreamClosure() {
function Jbig2Stream(bytes, dict) {
this.dict = dict;
this.bytes = bytes;
DecodeStream.call(this);
}
Jbig2Stream.prototype = Object.create(DecodeStream.prototype);
Jbig2Stream.prototype.ensureBuffer = function Jbig2Stream_ensureBuffer(req) {
if (this.bufferLength)
return;
var jbig2Image = new Jbig2Image();
var data = jbig2Image.parseChunk(this.bytes, 0, this.bytes.length);
var dataLength = data.length;
// JBIG2 had black as 1 and white as 0, inverting the colors
for (var i = 0; i < dataLength; i++)
data[i] ^= 0xFF;
this.buffer = data;
this.bufferLength = dataLength;
};
Jbig2Stream.prototype.getChar = function Jbig2Stream_getChar() {
error('internal error: getChar is not valid on Jbig2Stream');
};
return Jbig2Stream;
})();
var DecryptStream = (function DecryptStreamClosure() {
function DecryptStream(str, decrypt) {
this.str = str;