/// <summary>
/// Creates a new deflater with given compression level.
/// </summary>
/// <param name="level">
/// the compression level, a value between NO_COMPRESSION
/// and BEST_COMPRESSION.
/// </param>
/// <param name="noZlibHeaderOrFooter">
/// true, if we should suppress the Zlib/RFC1950 header at the
/// beginning and the adler checksum at the end of the output. This is
/// useful for the GZIP/PKZIP formats.
/// </param>
/// <exception cref="System.ArgumentOutOfRangeException">if lvl is out of range.</exception>
public Deflater(int level, bool noZlibHeaderOrFooter)
{
if (level == DEFAULT_COMPRESSION)
{
level = 6;
}
else if (level < NO_COMPRESSION || level > BEST_COMPRESSION)
{
throw new ArgumentOutOfRangeException("level");
}
pending = new DeflaterPending();
engine = new DeflaterEngine(pending);
this.noZlibHeaderOrFooter = noZlibHeaderOrFooter;
SetStrategy(DeflateStrategy.Default);
SetLevel(level);
Reset();
}
/// <summary>
/// Construct instance with pending buffer
/// </summary>
/// <param name="pending">Pending buffer to use</param>
public DeflaterHuffman(DeflaterPending pending)
{
this.pending = pending;
literalTree = new Tree(this, LITERAL_NUM, 257, 15);
distTree = new Tree(this, DIST_NUM, 1, 15);
blTree = new Tree(this, BITLEN_NUM, 4, 7);
d_buf = new short[BUFSIZE];
l_buf = new byte[BUFSIZE];
}
/// <summary>
/// Construct instance with pending buffer
/// </summary>
/// <param name="pending">
/// Pending buffer to use
/// </param>>
public DeflaterEngine(DeflaterPending pending)
{
this.pending = pending;
huffman = new DeflaterHuffman(pending);
adler = new Adler32();
window = new byte[2 * WSIZE];
head = new short[HASH_SIZE];
prev = new short[WSIZE];
// We start at index 1, to avoid an implementation deficiency, that
// we cannot build a repeat pattern at index 0.
blockStart = strstart = 1;
}