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Added a bit of defensive programming in the AlignmentPattern code. There were real world examples where the width passed to AlignmentPatternFinder was zero, which causes BitArray to throw when built with a size of zero. I'm going a little bit farther and not searching extremely small areas either.

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Sean, please review.

git-svn-id: https://zxing.googlecode.com/svn/trunk@617 59b500cc-1b3d-0410-9834-0bbf25fbcc57
This commit is contained in:
dswitkin 2008-10-14 18:24:23 +00:00
parent ef2f3f8ce0
commit c91f427a8b
1 changed files with 4 additions and 0 deletions
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4
core/src/com/google/zxing/qrcode/detector/Detector.java
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@ -334,6 +334,10 @@ public final class Detector {
int allowance = (int) (allowanceFactor * overallEstModuleSize);
int alignmentAreaLeftX = Math.max(0, estAlignmentX - allowance);
int alignmentAreaRightX = Math.min(image.getWidth() - 1, estAlignmentX + allowance);
if (alignmentAreaRightX - alignmentAreaLeftX < overallEstModuleSize * 3) {
throw new ReaderException("Alignment pattern is too small to search");
}
int alignmentAreaTopY = Math.max(0, estAlignmentY - allowance);
int alignmentAreaBottomY = Math.min(image.getHeight() - 1, estAlignmentY + allowance);