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TurboJPEG: Add lossless JPEG detection capability

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Add a new TurboJPEG C API function (tjDecompressHeader4()) and Java API
method (TJDecompressor.getFlags()) that return the bitwise OR of any
flags that are relevant to the JPEG image being decompressed (currently
TJFLAG_PROGRESSIVE, TJFLAG_ARITHMETIC, TJFLAG_LOSSLESS, and their Java
equivalents.)  This allows a calling program to determine whether the
image being decompressed is a lossless JPEG image, which means that the
decompression scaling feature will not be available and that a
full-sized destination buffer should be allocated.

More specifically, this fixes a buffer overrun in TJBench, TJExample,
and the decompress* fuzz targets that occurred when attempting (in vain)
to decompress a lossless JPEG image with decompression scaling enabled.
This commit is contained in:
DRC
2022-11-21 20:57:39 -06:00
parent b85b028d2b
commit 98ff1fd103
32 changed files with 481 additions and 283 deletions
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8
java/TJExample.java
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@@ -1,6 +1,6 @@
/*
* Copyright (C)2011-2012, 2014-2015, 2017-2018 D. R. Commander.
* All Rights Reserved.
* Copyright (C)2011-2012, 2014-2015, 2017-2018, 2022 D. R. Commander.
* All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
@@ -304,6 +304,10 @@ class TJExample implements TJCustomFilter {
height = tjd.getHeight();
int inSubsamp = tjd.getSubsamp();
int inColorspace = tjd.getColorspace();
int inFlags = tjd.getFlags();
if ((inFlags & TJ.FLAG_LOSSLESS) != 0)
scalingFactor = new TJScalingFactor(1, 1);
System.out.println((doTransform ? "Transformed" : "Input") +
" Image (jpg): " + width + " x " + height +