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-rw-r--r--core/src/fxcodec/jbig2/JBig2_ArithIntDecoder.cpp165
1 files changed, 81 insertions, 84 deletions
diff --git a/core/src/fxcodec/jbig2/JBig2_ArithIntDecoder.cpp b/core/src/fxcodec/jbig2/JBig2_ArithIntDecoder.cpp
index 1e115848a3..3aab2fb3e6 100644
--- a/core/src/fxcodec/jbig2/JBig2_ArithIntDecoder.cpp
+++ b/core/src/fxcodec/jbig2/JBig2_ArithIntDecoder.cpp
@@ -1,105 +1,102 @@
// Copyright 2014 PDFium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
-
+
// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
#include "JBig2_ArithIntDecoder.h"
-CJBig2_ArithIntDecoder::CJBig2_ArithIntDecoder()
-{
- IAx = (JBig2ArithCtx*)m_pModule->JBig2_Malloc2(sizeof(JBig2ArithCtx), 512);
- JBIG2_memset(IAx, 0, sizeof(JBig2ArithCtx) * 512);
+CJBig2_ArithIntDecoder::CJBig2_ArithIntDecoder() {
+ IAx = (JBig2ArithCtx*)m_pModule->JBig2_Malloc2(sizeof(JBig2ArithCtx), 512);
+ JBIG2_memset(IAx, 0, sizeof(JBig2ArithCtx) * 512);
}
-CJBig2_ArithIntDecoder::~CJBig2_ArithIntDecoder()
-{
- m_pModule->JBig2_Free(IAx);
+CJBig2_ArithIntDecoder::~CJBig2_ArithIntDecoder() {
+ m_pModule->JBig2_Free(IAx);
}
-int CJBig2_ArithIntDecoder::decode(CJBig2_ArithDecoder *pArithDecoder, int *nResult)
-{
- int PREV, V;
- int S, D;
- int nNeedBits, nTemp, i;
- PREV = 1;
- S = pArithDecoder->DECODE(IAx + PREV);
- PREV = (PREV << 1) | S;
+int CJBig2_ArithIntDecoder::decode(CJBig2_ArithDecoder* pArithDecoder,
+ int* nResult) {
+ int PREV, V;
+ int S, D;
+ int nNeedBits, nTemp, i;
+ PREV = 1;
+ S = pArithDecoder->DECODE(IAx + PREV);
+ PREV = (PREV << 1) | S;
+ D = pArithDecoder->DECODE(IAx + PREV);
+ PREV = (PREV << 1) | D;
+ if (D) {
D = pArithDecoder->DECODE(IAx + PREV);
PREV = (PREV << 1) | D;
- if(D) {
+ if (D) {
+ D = pArithDecoder->DECODE(IAx + PREV);
+ PREV = (PREV << 1) | D;
+ if (D) {
D = pArithDecoder->DECODE(IAx + PREV);
PREV = (PREV << 1) | D;
- if(D) {
- D = pArithDecoder->DECODE(IAx + PREV);
- PREV = (PREV << 1) | D;
- if(D) {
- D = pArithDecoder->DECODE(IAx + PREV);
- PREV = (PREV << 1) | D;
- if(D) {
- D = pArithDecoder->DECODE(IAx + PREV);
- PREV = (PREV << 1) | D;
- if(D) {
- nNeedBits = 32;
- V = 4436;
- } else {
- nNeedBits = 12;
- V = 340;
- }
- } else {
- nNeedBits = 8;
- V = 84;
- }
- } else {
- nNeedBits = 6;
- V = 20;
- }
+ if (D) {
+ D = pArithDecoder->DECODE(IAx + PREV);
+ PREV = (PREV << 1) | D;
+ if (D) {
+ nNeedBits = 32;
+ V = 4436;
+ } else {
+ nNeedBits = 12;
+ V = 340;
+ }
} else {
- nNeedBits = 4;
- V = 4;
+ nNeedBits = 8;
+ V = 84;
}
+ } else {
+ nNeedBits = 6;
+ V = 20;
+ }
} else {
- nNeedBits = 2;
- V = 0;
- }
- nTemp = 0;
- for(i = 0; i < nNeedBits; i++) {
- D = pArithDecoder->DECODE(IAx + PREV);
- if(PREV < 256) {
- PREV = (PREV << 1) | D;
- } else {
- PREV = (((PREV << 1) | D) & 511) | 256;
- }
- nTemp = (nTemp << 1) | D;
- }
- V += nTemp;
- if(S == 1 && V > 0) {
- V = -V;
+ nNeedBits = 4;
+ V = 4;
}
- *nResult = V;
- if(S == 1 && V == 0) {
- return JBIG2_OOB;
+ } else {
+ nNeedBits = 2;
+ V = 0;
+ }
+ nTemp = 0;
+ for (i = 0; i < nNeedBits; i++) {
+ D = pArithDecoder->DECODE(IAx + PREV);
+ if (PREV < 256) {
+ PREV = (PREV << 1) | D;
+ } else {
+ PREV = (((PREV << 1) | D) & 511) | 256;
}
- return 0;
+ nTemp = (nTemp << 1) | D;
+ }
+ V += nTemp;
+ if (S == 1 && V > 0) {
+ V = -V;
+ }
+ *nResult = V;
+ if (S == 1 && V == 0) {
+ return JBIG2_OOB;
+ }
+ return 0;
}
-CJBig2_ArithIaidDecoder::CJBig2_ArithIaidDecoder(unsigned char SBSYMCODELENA)
-{
- SBSYMCODELEN = SBSYMCODELENA;
- IAID = (JBig2ArithCtx*)m_pModule->JBig2_Malloc2(sizeof(JBig2ArithCtx), (1 << SBSYMCODELEN));
- JBIG2_memset(IAID, 0, sizeof(JBig2ArithCtx) * (int)(1 << SBSYMCODELEN));
+CJBig2_ArithIaidDecoder::CJBig2_ArithIaidDecoder(unsigned char SBSYMCODELENA) {
+ SBSYMCODELEN = SBSYMCODELENA;
+ IAID = (JBig2ArithCtx*)m_pModule->JBig2_Malloc2(sizeof(JBig2ArithCtx),
+ (1 << SBSYMCODELEN));
+ JBIG2_memset(IAID, 0, sizeof(JBig2ArithCtx) * (int)(1 << SBSYMCODELEN));
}
-CJBig2_ArithIaidDecoder::~CJBig2_ArithIaidDecoder()
-{
- m_pModule->JBig2_Free(IAID);
+CJBig2_ArithIaidDecoder::~CJBig2_ArithIaidDecoder() {
+ m_pModule->JBig2_Free(IAID);
}
-int CJBig2_ArithIaidDecoder::decode(CJBig2_ArithDecoder *pArithDecoder, int *nResult)
-{
- int PREV;
- int D;
- int i;
- PREV = 1;
- for(i = 0; i < SBSYMCODELEN; i++) {
- D = pArithDecoder->DECODE(IAID + PREV);
- PREV = (PREV << 1) | D;
- }
- PREV = PREV - (1 << SBSYMCODELEN);
- *nResult = PREV;
- return 0;
+int CJBig2_ArithIaidDecoder::decode(CJBig2_ArithDecoder* pArithDecoder,
+ int* nResult) {
+ int PREV;
+ int D;
+ int i;
+ PREV = 1;
+ for (i = 0; i < SBSYMCODELEN; i++) {
+ D = pArithDecoder->DECODE(IAID + PREV);
+ PREV = (PREV << 1) | D;
+ }
+ PREV = PREV - (1 << SBSYMCODELEN);
+ *nResult = PREV;
+ return 0;
}