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TJBench: Require known subsamp type w/tiled decomp

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(oversight from 386ec0abc7)

Tiled decompression will ultimately fail if the subsampling type of the
JPEG input image is unknown, but the C version of TJBench needs to fail
earlier in order to avoid using -1 (TJSAMP_UNKNOWN) as an array index
for tjMCUWidth[]/tjMCUHeight[].  The Java version now fails earlier as
well, although there is no benefit to that other than making the error
message less cryptic.
This commit is contained in:
DRC
2023-03-31 10:53:29 -05:00
parent cc8c6d3667
commit 0d20aa15ce
2 changed files with 13 additions and 4 deletions
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8
java/TJBench.java
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@@ -530,7 +530,7 @@ final class TJBench {
// Original image
int w = 0, h = 0, ntilesw = 1, ntilesh = 1, subsamp = -1, cs = -1;
// Transformed image
int minTile, tw, th, ttilew, ttileh, tntilesw, tntilesh, tsubsamp;
int minTile = 16, tw, th, ttilew, ttileh, tntilesw, tntilesh, tsubsamp;
FileInputStream fis = new FileInputStream(fileName);
if (fis.getChannel().size() > (long)Integer.MAX_VALUE)
@@ -593,7 +593,11 @@ final class TJBench {
precision, formatName(subsamp, cs), PIXFORMATSTR[pf],
bottomUp ? "Bottom-up" : "Top-down");
minTile = Math.max(TJ.getMCUWidth(subsamp), TJ.getMCUHeight(subsamp));
if (doTile) {
if (subsamp == TJ.SAMP_UNKNOWN)
throw new Exception("Could not determine subsampling level of JPEG image");
minTile = Math.max(TJ.getMCUWidth(subsamp), TJ.getMCUHeight(subsamp));
}
for (int tilew = doTile ? minTile : w, tileh = doTile ? minTile : h; ;
tilew *= 2, tileh *= 2) {
if (tilew > w)