/// <summary>
/// Construct instance with pending buffer
/// </summary>
/// <param name="pending">
/// Pending buffer to use
/// </param>
/// <param name="noAdlerCalculation">
/// If no adler calculation should be performed
/// </param>
public DeflaterEngine(DeflaterPending pending, bool noAdlerCalculation)
{
this.pending = pending;
huffman = new DeflaterHuffman(pending);
if (!noAdlerCalculation)
{
adler = new Adler32();
}
window = new byte[2 * DeflaterConstants.WSIZE];
head = new short[DeflaterConstants.HASH_SIZE];
prev = new short[DeflaterConstants.WSIZE];
// We start at index 1, to avoid an implementation deficiency, that
// we cannot build a repeat pattern at index 0.
blockStart = strstart = 1;
}
/// <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(nameof(level));
}
pending = new DeflaterPending();
engine = new DeflaterEngine(pending, noZlibHeaderOrFooter);
this.noZlibHeaderOrFooter = noZlibHeaderOrFooter;
SetStrategy(DeflateStrategy.Default);
SetLevel(level);
Reset();
}
/// <summary>
/// Construct instance with pending buffer
/// Adler calculation will be peformed
/// </summary>
/// <param name="pending">
/// Pending buffer to use
/// </param>
public DeflaterEngine(DeflaterPending pending)
: this(pending, false)
{
}