From 5110c4743751145c4ae1934cd1d83bc6c55bb43f Mon Sep 17 00:00:00 2001
From: John Abd-El-Malek <jabdelmalek@google.com>
Date: Sat, 17 May 2014 22:33:34 -0700
Subject: Initial commit.

---
 core/src/fxcodec/jbig2/JBig2_HuffmanDecoder.cpp | 55 +++++++++++++++++++++++++
 1 file changed, 55 insertions(+)
 create mode 100644 core/src/fxcodec/jbig2/JBig2_HuffmanDecoder.cpp

(limited to 'core/src/fxcodec/jbig2/JBig2_HuffmanDecoder.cpp')

diff --git a/core/src/fxcodec/jbig2/JBig2_HuffmanDecoder.cpp b/core/src/fxcodec/jbig2/JBig2_HuffmanDecoder.cpp
new file mode 100644
index 0000000000..8199fe7c21
--- /dev/null
+++ b/core/src/fxcodec/jbig2/JBig2_HuffmanDecoder.cpp
@@ -0,0 +1,55 @@
+// 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_HuffmanDecoder.h"
+CJBig2_HuffmanDecoder::CJBig2_HuffmanDecoder(CJBig2_BitStream *pStream)
+{
+    m_pStream = pStream;
+}
+CJBig2_HuffmanDecoder::~CJBig2_HuffmanDecoder()
+{
+}
+int CJBig2_HuffmanDecoder::decodeAValue(CJBig2_HuffmanTable *pTable, int *nResult)
+{
+    int nVal, nTmp, i, nBits;
+    nVal = 0;
+    nBits = 0;
+    while(1) {
+        if(m_pStream->read1Bit(&nTmp) == -1) {
+            return -1;
+        }
+        nVal = (nVal << 1) | nTmp;
+        nBits ++;
+        for(i = 0; i < pTable->NTEMP; i++) {
+            if((pTable->PREFLEN[i] == nBits) && (pTable->CODES[i] == nVal)) {
+                if((pTable->HTOOB == 1) && (i == pTable->NTEMP - 1)) {
+                    return JBIG2_OOB;
+                }
+                if(m_pStream->readNBits(pTable->RANGELEN[i], &nTmp) == -1) {
+                    return -1;
+                }
+                if(pTable->HTOOB) {
+                    if(i == pTable->NTEMP - 3) {
+                        *nResult = pTable->RANGELOW[i] - nTmp;
+                        return 0;
+                    } else {
+                        *nResult = pTable->RANGELOW[i] + nTmp;
+                        return 0;
+                    }
+                } else {
+                    if(i == pTable->NTEMP - 2) {
+                        *nResult = pTable->RANGELOW[i] - nTmp;
+                        return 0;
+                    } else {
+                        *nResult = pTable->RANGELOW[i] + nTmp;
+                        return 0;
+                    }
+                }
+            }
+        }
+    }
+    return -2;
+}
-- 
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