Add hostTools from https://github.com/Noltari/cfe_bcm63xx

1 files changed, 66 insertions, 0 deletions

diff --git a/hostTools/lzma/compress/LiteralCoder.cpp b/hostTools/lzma/compress/LiteralCoder.cpp
new file mode 100644
index 0000000..fdb4fe3
--- /dev/null
+++ b/hostTools/lzma/compress/LiteralCoder.cpp
@@ -0,0 +1,66 @@
+#include "LiteralCoder.h"
+
+using namespace NCompression;
+using namespace NArithmetic;
+
+namespace NLiteral {
+
+void CEncoder2::Init()
+{
+  for (int i = 0; i < 3; i++)
+    for (int j = 1; j < (1 << 8); j++)
+      m_Encoders[i][j].Init();
+}
+
+void CEncoder2::Encode(CMyRangeEncoder *aRangeEncoder, 
+    bool aMatchMode, BYTE aMatchByte, BYTE aSymbol)
+{
+  UINT32 aContext = 1;
+  bool aSame = true;
+  for (int i = 7; i >= 0; i--)
+  {
+    UINT32 aBit = (aSymbol >> i) & 1;
+    unsigned aState;
+    if (aMatchMode && aSame)
+    {
+      UINT32 aMatchBit = (aMatchByte >> i) & 1;
+      aState = 1 + aMatchBit;
+      aSame = (aMatchBit == aBit);
+    }
+    else
+      aState = 0;
+    m_Encoders[aState][aContext].Encode(aRangeEncoder, aBit);
+    aContext = (aContext << 1) | aBit;
+  }
+}
+
+UINT32 CEncoder2::GetPrice(bool aMatchMode, BYTE aMatchByte, BYTE aSymbol) const
+{
+  UINT32 aPrice = 0;
+  UINT32 aContext = 1;
+  int i = 7;
+  if (aMatchMode)
+  {
+    for (; i >= 0; i--)
+    {
+      UINT32 aMatchBit = (aMatchByte >> i) & 1;
+      UINT32 aBit = (aSymbol >> i) & 1;
+      aPrice += m_Encoders[1 + aMatchBit][aContext].GetPrice(aBit);
+      aContext = (aContext << 1) | aBit;
+      if (aMatchBit != aBit)
+      {
+        i--;
+        break;
+      }
+    }
+  }
+  for (; i >= 0; i--)
+  {
+    UINT32 aBit = (aSymbol >> i) & 1;
+    aPrice += m_Encoders[0][aContext].GetPrice(aBit);
+    aContext = (aContext << 1) | aBit;
+  }
+  return aPrice;
+};
+
+}