146 lines
3.6 KiB
C#
146 lines
3.6 KiB
C#
using System;
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namespace ICSharpCode.SharpZipLib.Zip.Compression
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{
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/// <summary>
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/// This class contains constants used for deflation.
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/// </summary>
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public static class DeflaterConstants
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{
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/// <summary>
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/// Set to true to enable debugging
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/// </summary>
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public const bool DEBUGGING = false;
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/// <summary>
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/// Written to Zip file to identify a stored block
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/// </summary>
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public const int STORED_BLOCK = 0;
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/// <summary>
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/// Identifies static tree in Zip file
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/// </summary>
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public const int STATIC_TREES = 1;
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/// <summary>
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/// Identifies dynamic tree in Zip file
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/// </summary>
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public const int DYN_TREES = 2;
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/// <summary>
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/// Header flag indicating a preset dictionary for deflation
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/// </summary>
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public const int PRESET_DICT = 0x20;
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/// <summary>
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/// Sets internal buffer sizes for Huffman encoding
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/// </summary>
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public const int DEFAULT_MEM_LEVEL = 8;
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/// <summary>
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/// Internal compression engine constant
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/// </summary>
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public const int MAX_MATCH = 258;
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/// <summary>
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/// Internal compression engine constant
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/// </summary>
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public const int MIN_MATCH = 3;
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/// <summary>
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/// Internal compression engine constant
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/// </summary>
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public const int MAX_WBITS = 15;
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/// <summary>
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/// Internal compression engine constant
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/// </summary>
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public const int WSIZE = 1 << MAX_WBITS;
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/// <summary>
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/// Internal compression engine constant
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/// </summary>
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public const int WMASK = WSIZE - 1;
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/// <summary>
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/// Internal compression engine constant
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/// </summary>
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public const int HASH_BITS = DEFAULT_MEM_LEVEL + 7;
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/// <summary>
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/// Internal compression engine constant
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/// </summary>
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public const int HASH_SIZE = 1 << HASH_BITS;
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/// <summary>
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/// Internal compression engine constant
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/// </summary>
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public const int HASH_MASK = HASH_SIZE - 1;
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/// <summary>
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/// Internal compression engine constant
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/// </summary>
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public const int HASH_SHIFT = (HASH_BITS + MIN_MATCH - 1) / MIN_MATCH;
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/// <summary>
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/// Internal compression engine constant
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/// </summary>
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public const int MIN_LOOKAHEAD = MAX_MATCH + MIN_MATCH + 1;
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/// <summary>
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/// Internal compression engine constant
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/// </summary>
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public const int MAX_DIST = WSIZE - MIN_LOOKAHEAD;
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/// <summary>
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/// Internal compression engine constant
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/// </summary>
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public const int PENDING_BUF_SIZE = 1 << (DEFAULT_MEM_LEVEL + 8);
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/// <summary>
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/// Internal compression engine constant
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/// </summary>
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public static int MAX_BLOCK_SIZE = Math.Min(65535, PENDING_BUF_SIZE - 5);
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/// <summary>
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/// Internal compression engine constant
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/// </summary>
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public const int DEFLATE_STORED = 0;
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/// <summary>
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/// Internal compression engine constant
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/// </summary>
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public const int DEFLATE_FAST = 1;
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/// <summary>
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/// Internal compression engine constant
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/// </summary>
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public const int DEFLATE_SLOW = 2;
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/// <summary>
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/// Internal compression engine constant
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/// </summary>
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public static int[] GOOD_LENGTH = { 0, 4, 4, 4, 4, 8, 8, 8, 32, 32 };
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/// <summary>
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/// Internal compression engine constant
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/// </summary>
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public static int[] MAX_LAZY = { 0, 4, 5, 6, 4, 16, 16, 32, 128, 258 };
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/// <summary>
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/// Internal compression engine constant
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/// </summary>
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public static int[] NICE_LENGTH = { 0, 8, 16, 32, 16, 32, 128, 128, 258, 258 };
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/// <summary>
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/// Internal compression engine constant
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/// </summary>
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public static int[] MAX_CHAIN = { 0, 4, 8, 32, 16, 32, 128, 256, 1024, 4096 };
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/// <summary>
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/// Internal compression engine constant
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/// </summary>
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public static int[] COMPR_FUNC = { 0, 1, 1, 1, 1, 2, 2, 2, 2, 2 };
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}
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}
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