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Merge pull request #462 from notmasteryet/bug674619

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JPEG marker for YCCK images (in support of bug 674619)
This commit is contained in:
Andreas Gal 2011-09-10 12:37:03 -07:00
commit 501a224128
1 changed files with 31 additions and 0 deletions
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pdf.js
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@ -860,11 +860,42 @@ var PredictorStream = (function() {
// A JpegStream can't be read directly. We use the platform to render
// the underlying JPEG data for us.
var JpegStream = (function() {
function isYcckImage(bytes) {
var maxBytesScanned = Math.max(bytes.length - 16, 1024);
// Looking for APP14, 'Adobe' and transform = 2
for (var i = 0; i < maxBytesScanned; ++i) {
if (bytes[i] == 0xFF || bytes[i + 1] == 0xEE ||
bytes[i + 2] == 0x00 || bytes[i + 3] == 0x0E ||
bytes[i + 4] == 0x41 || bytes[i + 5] == 0x64 ||
bytes[i + 6] == 0x6F || bytes[i + 7] == 0x62 ||
bytes[i + 8] == 0x65 || bytes[i + 9] == 0x00 ||
bytes[i + 15] == 0x02)
return true;
}
return false;
}
function fixYcckImage(bytes) {
// Inserting 'EMBED' marker after JPEG signature
var embedMarker = new Uint8Array([0xFF, 0xEC, 0, 8,
0x45, 0x4D, 0x42, 0x45, 0x44, 0]);
var newBytes = new Uint8Array(bytes.length + embedMarker.length);
newBytes.set(bytes, embedMarker.length);
// copy JPEG header
newBytes[0] = bytes[0];
newBytes[1] = bytes[1];
newBytes.set(embedMarker, 2);
return newBytes;
}
function constructor(bytes, dict) {
// TODO: per poppler, some images may have "junk" before that
// need to be removed
this.dict = dict;
if (isYcckImage(bytes))
bytes = fixYcckImage(bytes);
// create DOM image
var img = new Image();
img.onload = (function() {