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Fix COSPredictorDecode #670

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Merged
MaximPlusov merged 1 commit into from
May 15, 2025
Merged

Fix COSPredictorDecode #670

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20 changes: 10 additions & 10 deletions src/main/java/org/verapdf/cos/filters/COSPredictorDecode.java
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Original file line number Diff line number Diff line change
Expand Up @@ -173,21 +173,21 @@ public int read(byte[] buffer, int size) throws IOException {
break;
case 13: // Avg
for (int i = 0; i < lineLength; i++) {
byte value = currentLine[i];
byte left = i - bytesPerChar >= 0 ?
currentLine[i - bytesPerChar] : 0;
byte up = previousLine[i];
int value = currentLine[i] & 0xFF;
int left = i - bytesPerChar >= 0 ?
currentLine[i - bytesPerChar] & 0xFF : 0;
int up = previousLine[i] & 0xFF;
currentLine[i] = (byte) (value + (left + up) / 2);
}
break;
case 14: // Paeth
for (int i = 0; i < lineLength; i++) {
byte value = currentLine[i];
byte left = i - bytesPerChar >= 0 ?
currentLine[i - bytesPerChar] : 0;
byte up = previousLine[i];
byte upLeft = i - bytesPerChar >= 0 ?
previousLine[i - bytesPerChar] : 0;
int value = currentLine[i] & 0xFF;
int left = i - bytesPerChar >= 0 ?
currentLine[i - bytesPerChar] & 0xFF : 0;
int up = previousLine[i] & 0xFF;
int upLeft = i - bytesPerChar >= 0 ?
previousLine[i - bytesPerChar] & 0xFF : 0;
int res = left + up - upLeft;
int leftDiff = Math.abs(res - left);
int upDiff = Math.abs(res - up);
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