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-rw-r--r--core/fxcodec/jbig2/JBig2_TrdProc.cpp14
1 files changed, 7 insertions, 7 deletions
diff --git a/core/fxcodec/jbig2/JBig2_TrdProc.cpp b/core/fxcodec/jbig2/JBig2_TrdProc.cpp
index 4790f6657c..79b2142a9f 100644
--- a/core/fxcodec/jbig2/JBig2_TrdProc.cpp
+++ b/core/fxcodec/jbig2/JBig2_TrdProc.cpp
@@ -27,11 +27,11 @@ Optional<uint32_t> CheckTRDDimension(uint32_t dimension, int32_t delta) {
return {result.ValueOrDie()};
}
-Optional<int32_t> CheckTRDReferenceDimension(uint32_t dimension,
- uint32_t divisor,
+Optional<int32_t> CheckTRDReferenceDimension(int32_t dimension,
+ uint32_t shift,
int32_t offset) {
FX_SAFE_INT32 result = offset;
- result += dimension / divisor;
+ result += dimension >> shift;
if (!result.IsValid())
return {};
return {result.ValueOrDie()};
@@ -162,9 +162,9 @@ std::unique_ptr<CJBig2_Image> CJBig2_TRDProc::DecodeHuffman(
return nullptr;
Optional<int32_t> GRREFERENCEDX =
- CheckTRDReferenceDimension(RDWI, 4, RDXI);
+ CheckTRDReferenceDimension(RDWI, 2, RDXI);
Optional<int32_t> GRREFERENCEDY =
- CheckTRDReferenceDimension(RDHI, 4, RDYI);
+ CheckTRDReferenceDimension(RDHI, 2, RDYI);
if (!GRREFERENCEDX || !GRREFERENCEDY)
return nullptr;
@@ -342,9 +342,9 @@ std::unique_ptr<CJBig2_Image> CJBig2_TRDProc::DecodeArith(
return nullptr;
Optional<int32_t> GRREFERENCEDX =
- CheckTRDReferenceDimension(RDWI, 2, RDXI);
+ CheckTRDReferenceDimension(RDWI, 1, RDXI);
Optional<int32_t> GRREFERENCEDY =
- CheckTRDReferenceDimension(RDHI, 2, RDYI);
+ CheckTRDReferenceDimension(RDHI, 1, RDYI);
if (!GRREFERENCEDX || !GRREFERENCEDY)
return nullptr;