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| 1 // Copyright 2014 PDFium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com | |
| 6 | |
| 7 #include "core/src/fxcodec/jbig2/JBig2_HuffmanDecoder.h" | |
| 8 | |
| 9 #include "core/src/fxcodec/jbig2/JBig2_Define.h" | |
| 10 | |
| 11 CJBig2_HuffmanDecoder::CJBig2_HuffmanDecoder(CJBig2_BitStream* pStream) | |
| 12 : m_pStream(pStream) { | |
| 13 } | |
| 14 | |
| 15 CJBig2_HuffmanDecoder::~CJBig2_HuffmanDecoder() {} | |
| 16 | |
| 17 int CJBig2_HuffmanDecoder::decodeAValue(CJBig2_HuffmanTable* pTable, | |
| 18 int* nResult) { | |
| 19 int nVal = 0; | |
| 20 int nBits = 0; | |
| 21 while (1) { | |
| 22 FX_DWORD nTmp; | |
| 23 if (m_pStream->read1Bit(&nTmp) == -1) | |
| 24 break; | |
| 25 | |
| 26 nVal = (nVal << 1) | nTmp; | |
| 27 ++nBits; | |
| 28 for (FX_DWORD i = 0; i < pTable->Size(); ++i) { | |
| 29 if (pTable->GetPREFLEN()[i] == nBits && pTable->GetCODES()[i] == nVal) { | |
| 30 if (pTable->IsHTOOB() && i == pTable->Size() - 1) | |
| 31 return JBIG2_OOB; | |
| 32 | |
| 33 if (m_pStream->readNBits(pTable->GetRANGELEN()[i], &nTmp) == -1) | |
| 34 return -1; | |
| 35 | |
| 36 FX_DWORD offset = pTable->IsHTOOB() ? 3 : 2; | |
| 37 if (i == pTable->Size() - offset) | |
| 38 *nResult = pTable->GetRANGELOW()[i] - nTmp; | |
| 39 else | |
| 40 *nResult = pTable->GetRANGELOW()[i] + nTmp; | |
| 41 return 0; | |
| 42 } | |
| 43 } | |
| 44 } | |
| 45 return -1; | |
| 46 } | |
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