public void CalcBLFreq(CompressorHuffmanTree blTree)
{
int max_count;
int min_count;
int count;
int curlen = -1;
int i = 0;
while (i < m_CodeCount)
{
count = 1;
int nextlen = m_CodeLengths[i];
if (nextlen == 0)
{
max_count = 138;
min_count = 3;
}
else
{
max_count = 6;
min_count = 3;
if (curlen != nextlen)
{
blTree.m_CodeFrequences[nextlen]++;
count = 0;
}
}
curlen = nextlen;
i++;
while (i < m_CodeCount && curlen == m_CodeLengths[i])
{
i++;
if (++count >= max_count)
{
break;
}
}
if (count < min_count)
{
blTree.m_CodeFrequences[curlen] += (short)count;
}
else if (curlen != 0)
{
blTree.m_CodeFrequences[16]++;
}
else if (count <= 10)
{
blTree.m_CodeFrequences[17]++;
}
else
{
blTree.m_CodeFrequences[18]++;
}
}
}
public void WriteTree(CompressorHuffmanTree blTree)
{
int iMaxRepeatCount;
int iMinRepeatCount;
int iCurrentRepeatCount;
int iCurrentCodeLength = -1;
int i = 0;
while (i < m_CodeCount)
{
iCurrentRepeatCount = 1;
int nextlen = m_CodeLengths[i];
if (nextlen == 0)
{
iMaxRepeatCount = 138;
iMinRepeatCount = 3;
}
else
{
iMaxRepeatCount = 6;
iMinRepeatCount = 3;
if (iCurrentCodeLength != nextlen)
{
blTree.WriteCodeToStream(nextlen);
iCurrentRepeatCount = 0;
}
}
iCurrentCodeLength = nextlen;
i++;
while (i < m_CodeCount && iCurrentCodeLength == m_CodeLengths[i])
{
i++;
if (++iCurrentRepeatCount >= iMaxRepeatCount)
{
break;
}
}
if (iCurrentRepeatCount < iMinRepeatCount)
{
while (iCurrentRepeatCount-- > 0)
{
blTree.WriteCodeToStream(iCurrentCodeLength);
}
}
else if (iCurrentCodeLength != 0)
{
blTree.WriteCodeToStream(16);
m_Writer.PendingBufferWriteBits(iCurrentRepeatCount - 3, 2);
}
else if (iCurrentRepeatCount <= 10)
{
blTree.WriteCodeToStream(17);
m_Writer.PendingBufferWriteBits(iCurrentRepeatCount - 3, 3);
}
else
{
blTree.WriteCodeToStream(18);
m_Writer.PendingBufferWriteBits(iCurrentRepeatCount - 11, 7);
}
}
}
public CompressedStreamWriter(Stream outputStream, bool bNoWrap, CompressionLevel level, bool bCloseStream)
{
if (outputStream == null)
throw new ArgumentNullException("outputStream");
if (!outputStream.CanWrite)
throw new ArgumentException("Output stream does not support writing.", "outputStream");
m_treeLiteral = new CompressorHuffmanTree(this, DEF_HUFFMAN_LITERAL_ALPHABET_LENGTH, 257, 15);
m_treeDistances = new CompressorHuffmanTree(this, DEF_HUFFMAN_DISTANCES_ALPHABET_LENGTH, 1, 15);
m_treeCodeLengths = new CompressorHuffmanTree(this, DEF_HUFFMAN_BITLEN_TREE_LENGTH, 4, 7);
m_arrDistancesBuffer = new short[DEF_HUFFMAN_BUFFER_SIZE];
m_arrLiteralsBuffer = new byte[DEF_HUFFMAN_BUFFER_SIZE];
m_stream = outputStream;
m_Level = level;
m_bNoWrap = bNoWrap;
m_bCloseStream = bCloseStream;
m_DataWindow = new byte[2 * WSIZE];
m_HashHead = new short[HASH_SIZE];
m_HashPrevious = new short[WSIZE];
m_BlockStart = m_StringStart = 1;
m_GoodLength = GOOD_LENGTH[(int)level];
m_MaximumLazySearch = MAX_LAZY[(int)level];
m_NiceLength = NICE_LENGTH[(int)level];
m_MaximumChainLength = MAX_CHAIN[(int)level];
m_CompressionFunction = COMPR_FUNC[(int)level];
if (!bNoWrap)
{
WriteZLIBHeader();
}
}
