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-rw-r--r--core/fxcodec/jbig2/JBig2_ArithDecoder.cpp8
-rw-r--r--core/fxcodec/jbig2/JBig2_ArithDecoder.h1
2 files changed, 8 insertions, 1 deletions
diff --git a/core/fxcodec/jbig2/JBig2_ArithDecoder.cpp b/core/fxcodec/jbig2/JBig2_ArithDecoder.cpp
index 45628a87ce..deba72bfc5 100644
--- a/core/fxcodec/jbig2/JBig2_ArithDecoder.cpp
+++ b/core/fxcodec/jbig2/JBig2_ArithDecoder.cpp
@@ -56,7 +56,7 @@ int DecodeNLPS(JBig2ArithCtx* pCX, const JBig2ArithQe& qe) {
} // namespace
CJBig2_ArithDecoder::CJBig2_ArithDecoder(CJBig2_BitStream* pStream)
- : m_Complete(false), m_pStream(pStream) {
+ : m_Complete(false), m_FinishedStream(false), m_pStream(pStream) {
m_B = m_pStream->getCurByte_arith();
m_C = (m_B ^ 0xff) << 16;
BYTEIN();
@@ -95,6 +95,12 @@ void CJBig2_ArithDecoder::BYTEIN() {
B1 = m_pStream->getNextByte_arith();
if (B1 > 0x8f) {
m_CT = 8;
+ // If we are here, it means that we have finished decoding data (see JBIG2
+ // spec, Section E.3.4). If we arrive here a second time, we're looping,
+ // so complete decoding.
+ if (m_FinishedStream)
+ m_Complete = true;
+ m_FinishedStream = true;
} else {
m_pStream->incByteIdx();
m_B = B1;
diff --git a/core/fxcodec/jbig2/JBig2_ArithDecoder.h b/core/fxcodec/jbig2/JBig2_ArithDecoder.h
index d4a2daedbc..c9e29a5937 100644
--- a/core/fxcodec/jbig2/JBig2_ArithDecoder.h
+++ b/core/fxcodec/jbig2/JBig2_ArithDecoder.h
@@ -35,6 +35,7 @@ class CJBig2_ArithDecoder {
void ReadValueA();
bool m_Complete;
+ bool m_FinishedStream;
uint8_t m_B;
unsigned int m_C;
unsigned int m_A;