662 lines
15 KiB
C#
662 lines
15 KiB
C#
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using System;
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namespace ComponentAce.Compression.Libs.zlib
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{
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internal sealed class InfBlocks
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{
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private const int MANY = 1440;
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private static readonly int[] inflate_mask = new int[17]
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{
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0, 1, 3, 7, 15, 31, 63, 127, 255, 511,
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1023, 2047, 4095, 8191, 16383, 32767, 65535
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};
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internal static readonly int[] border = new int[19]
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{
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16, 17, 18, 0, 8, 7, 9, 6, 10, 5,
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11, 4, 12, 3, 13, 2, 14, 1, 15
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};
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private const int Z_OK = 0;
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private const int Z_STREAM_END = 1;
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private const int Z_NEED_DICT = 2;
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private const int Z_ERRNO = -1;
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private const int Z_STREAM_ERROR = -2;
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private const int Z_DATA_ERROR = -3;
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private const int Z_MEM_ERROR = -4;
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private const int Z_BUF_ERROR = -5;
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private const int Z_VERSION_ERROR = -6;
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private const int TYPE = 0;
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private const int LENS = 1;
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private const int STORED = 2;
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private const int TABLE = 3;
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private const int BTREE = 4;
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private const int DTREE = 5;
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private const int CODES = 6;
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private const int DRY = 7;
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private const int DONE = 8;
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private const int BAD = 9;
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internal int mode;
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internal int left;
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internal int table;
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internal int index;
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internal int[] blens;
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internal int[] bb = new int[1];
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internal int[] tb = new int[1];
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internal InfCodes codes;
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internal int last;
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internal int bitk;
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internal int bitb;
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internal int[] hufts;
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internal byte[] window;
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internal int end;
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internal int read;
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internal int write;
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internal object checkfn;
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internal long check;
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internal InfBlocks(ZStream z, object checkfn, int w)
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{
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hufts = new int[4320];
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window = new byte[w];
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end = w;
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this.checkfn = checkfn;
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mode = 0;
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reset(z, null);
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}
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internal void reset(ZStream z, long[] c)
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{
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if (c != null)
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{
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c[0] = check;
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}
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if (mode == 4 || mode == 5)
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{
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blens = null;
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}
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if (mode == 6)
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{
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codes.free(z);
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}
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mode = 0;
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bitk = 0;
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bitb = 0;
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read = (write = 0);
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if (checkfn != null)
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{
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z.adler = (check = z._adler.adler32(0L, null, 0, 0));
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}
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}
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internal int proc(ZStream z, int r)
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{
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int num = z.next_in_index;
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int num2 = z.avail_in;
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int num3 = bitb;
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int i = bitk;
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int num4 = write;
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int num5 = ((num4 < read) ? (read - num4 - 1) : (end - num4));
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while (true)
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{
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switch (mode)
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{
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case 0:
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{
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for (; i < 3; i += 8)
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{
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if (num2 != 0)
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{
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r = 0;
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num2--;
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num3 |= (z.next_in[num++] & 0xFF) << i;
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continue;
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}
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bitb = num3;
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bitk = i;
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z.avail_in = num2;
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z.total_in += num - z.next_in_index;
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z.next_in_index = num;
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write = num4;
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return inflate_flush(z, r);
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}
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int num6 = num3 & 7;
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last = num6 & 1;
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switch (SupportClass.URShift(num6, 1))
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{
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case 0:
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num3 = SupportClass.URShift(num3, 3);
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i -= 3;
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num6 = i & 7;
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num3 = SupportClass.URShift(num3, num6);
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i -= num6;
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mode = 1;
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break;
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case 1:
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{
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int[] array5 = new int[1];
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int[] array6 = new int[1];
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int[][] array7 = new int[1][];
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int[][] array8 = new int[1][];
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InfTree.inflate_trees_fixed(array5, array6, array7, array8, z);
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codes = new InfCodes(array5[0], array6[0], array7[0], array8[0], z);
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num3 = SupportClass.URShift(num3, 3);
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i -= 3;
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mode = 6;
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break;
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}
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case 2:
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num3 = SupportClass.URShift(num3, 3);
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i -= 3;
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mode = 3;
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break;
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case 3:
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num3 = SupportClass.URShift(num3, 3);
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i -= 3;
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mode = 9;
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z.msg = "invalid block type";
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r = -3;
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bitb = num3;
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bitk = i;
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z.avail_in = num2;
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z.total_in += num - z.next_in_index;
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z.next_in_index = num;
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write = num4;
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return inflate_flush(z, r);
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}
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break;
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}
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case 1:
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for (; i < 32; i += 8)
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{
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if (num2 != 0)
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{
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r = 0;
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num2--;
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num3 |= (z.next_in[num++] & 0xFF) << i;
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continue;
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}
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bitb = num3;
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bitk = i;
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z.avail_in = num2;
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z.total_in += num - z.next_in_index;
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z.next_in_index = num;
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write = num4;
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return inflate_flush(z, r);
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}
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if ((SupportClass.URShift(~num3, 16) & 0xFFFF) != (num3 & 0xFFFF))
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{
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mode = 9;
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z.msg = "invalid stored block lengths";
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r = -3;
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bitb = num3;
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bitk = i;
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z.avail_in = num2;
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z.total_in += num - z.next_in_index;
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z.next_in_index = num;
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write = num4;
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return inflate_flush(z, r);
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}
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left = num3 & 0xFFFF;
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num3 = (i = 0);
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mode = ((left != 0) ? 2 : ((last != 0) ? 7 : 0));
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break;
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case 2:
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{
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if (num2 == 0)
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{
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bitb = num3;
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bitk = i;
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z.avail_in = num2;
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z.total_in += num - z.next_in_index;
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z.next_in_index = num;
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write = num4;
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return inflate_flush(z, r);
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}
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if (num5 == 0)
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{
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if (num4 == end && read != 0)
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{
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num4 = 0;
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num5 = ((num4 < read) ? (read - num4 - 1) : (end - num4));
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}
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if (num5 == 0)
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{
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write = num4;
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r = inflate_flush(z, r);
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num4 = write;
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num5 = ((num4 < read) ? (read - num4 - 1) : (end - num4));
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if (num4 == end && read != 0)
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{
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num4 = 0;
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num5 = ((num4 < read) ? (read - num4 - 1) : (end - num4));
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}
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if (num5 == 0)
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{
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bitb = num3;
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bitk = i;
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z.avail_in = num2;
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z.total_in += num - z.next_in_index;
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z.next_in_index = num;
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write = num4;
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return inflate_flush(z, r);
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}
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}
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}
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r = 0;
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int num6 = left;
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if (num6 > num2)
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{
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num6 = num2;
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}
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if (num6 > num5)
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{
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num6 = num5;
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}
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Array.Copy(z.next_in, num, window, num4, num6);
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num += num6;
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num2 -= num6;
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num4 += num6;
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num5 -= num6;
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if ((left -= num6) == 0)
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{
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mode = ((last != 0) ? 7 : 0);
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}
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break;
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}
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case 3:
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{
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for (; i < 14; i += 8)
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{
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if (num2 != 0)
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{
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r = 0;
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num2--;
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num3 |= (z.next_in[num++] & 0xFF) << i;
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continue;
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}
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bitb = num3;
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bitk = i;
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z.avail_in = num2;
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z.total_in += num - z.next_in_index;
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z.next_in_index = num;
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write = num4;
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return inflate_flush(z, r);
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}
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int num6 = (table = num3 & 0x3FFF);
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if ((num6 & 0x1F) > 29 || ((num6 >> 5) & 0x1F) > 29)
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{
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mode = 9;
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z.msg = "too many length or distance symbols";
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r = -3;
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bitb = num3;
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bitk = i;
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z.avail_in = num2;
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z.total_in += num - z.next_in_index;
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z.next_in_index = num;
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write = num4;
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return inflate_flush(z, r);
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}
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num6 = 258 + (num6 & 0x1F) + ((num6 >> 5) & 0x1F);
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blens = new int[num6];
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num3 = SupportClass.URShift(num3, 14);
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i -= 14;
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index = 0;
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mode = 4;
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goto case 4;
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}
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case 4:
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{
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while (index < 4 + SupportClass.URShift(table, 10))
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{
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for (; i < 3; i += 8)
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{
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if (num2 != 0)
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{
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r = 0;
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num2--;
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num3 |= (z.next_in[num++] & 0xFF) << i;
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continue;
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}
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bitb = num3;
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bitk = i;
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z.avail_in = num2;
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z.total_in += num - z.next_in_index;
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z.next_in_index = num;
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write = num4;
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return inflate_flush(z, r);
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}
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blens[border[index++]] = num3 & 7;
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num3 = SupportClass.URShift(num3, 3);
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i -= 3;
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}
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while (index < 19)
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{
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blens[border[index++]] = 0;
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}
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bb[0] = 7;
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int num6 = InfTree.inflate_trees_bits(blens, bb, tb, hufts, z);
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if (num6 != 0)
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{
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r = num6;
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if (r == -3)
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{
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blens = null;
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mode = 9;
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}
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bitb = num3;
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bitk = i;
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z.avail_in = num2;
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z.total_in += num - z.next_in_index;
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z.next_in_index = num;
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write = num4;
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return inflate_flush(z, r);
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}
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index = 0;
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mode = 5;
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goto case 5;
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}
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case 5:
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{
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int num6;
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while (true)
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{
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num6 = table;
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if (index >= 258 + (num6 & 0x1F) + ((num6 >> 5) & 0x1F))
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{
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break;
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}
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for (num6 = bb[0]; i < num6; i += 8)
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{
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if (num2 != 0)
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{
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|
|
r = 0;
|
||
|
|
num2--;
|
||
|
|
num3 |= (z.next_in[num++] & 0xFF) << i;
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
bitb = num3;
|
||
|
|
bitk = i;
|
||
|
|
z.avail_in = num2;
|
||
|
|
z.total_in += num - z.next_in_index;
|
||
|
|
z.next_in_index = num;
|
||
|
|
write = num4;
|
||
|
|
return inflate_flush(z, r);
|
||
|
|
}
|
||
|
|
_ = tb[0];
|
||
|
|
_ = -1;
|
||
|
|
num6 = hufts[(tb[0] + (num3 & inflate_mask[num6])) * 3 + 1];
|
||
|
|
int num7 = hufts[(tb[0] + (num3 & inflate_mask[num6])) * 3 + 2];
|
||
|
|
if (num7 < 16)
|
||
|
|
{
|
||
|
|
num3 = SupportClass.URShift(num3, num6);
|
||
|
|
i -= num6;
|
||
|
|
blens[index++] = num7;
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
int num8 = ((num7 == 18) ? 7 : (num7 - 14));
|
||
|
|
int num9 = ((num7 == 18) ? 11 : 3);
|
||
|
|
for (; i < num6 + num8; i += 8)
|
||
|
|
{
|
||
|
|
if (num2 != 0)
|
||
|
|
{
|
||
|
|
r = 0;
|
||
|
|
num2--;
|
||
|
|
num3 |= (z.next_in[num++] & 0xFF) << i;
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
bitb = num3;
|
||
|
|
bitk = i;
|
||
|
|
z.avail_in = num2;
|
||
|
|
z.total_in += num - z.next_in_index;
|
||
|
|
z.next_in_index = num;
|
||
|
|
write = num4;
|
||
|
|
return inflate_flush(z, r);
|
||
|
|
}
|
||
|
|
num3 = SupportClass.URShift(num3, num6);
|
||
|
|
i -= num6;
|
||
|
|
num9 += num3 & inflate_mask[num8];
|
||
|
|
num3 = SupportClass.URShift(num3, num8);
|
||
|
|
i -= num8;
|
||
|
|
num8 = index;
|
||
|
|
num6 = table;
|
||
|
|
if (num8 + num9 > 258 + (num6 & 0x1F) + ((num6 >> 5) & 0x1F) || (num7 == 16 && num8 < 1))
|
||
|
|
{
|
||
|
|
blens = null;
|
||
|
|
mode = 9;
|
||
|
|
z.msg = "invalid bit length repeat";
|
||
|
|
r = -3;
|
||
|
|
bitb = num3;
|
||
|
|
bitk = i;
|
||
|
|
z.avail_in = num2;
|
||
|
|
z.total_in += num - z.next_in_index;
|
||
|
|
z.next_in_index = num;
|
||
|
|
write = num4;
|
||
|
|
return inflate_flush(z, r);
|
||
|
|
}
|
||
|
|
num7 = ((num7 == 16) ? blens[num8 - 1] : 0);
|
||
|
|
do
|
||
|
|
{
|
||
|
|
blens[num8++] = num7;
|
||
|
|
}
|
||
|
|
while (--num9 != 0);
|
||
|
|
index = num8;
|
||
|
|
}
|
||
|
|
tb[0] = -1;
|
||
|
|
int[] array = new int[1];
|
||
|
|
int[] array2 = new int[1];
|
||
|
|
int[] array3 = new int[1];
|
||
|
|
int[] array4 = new int[1];
|
||
|
|
array[0] = 9;
|
||
|
|
array2[0] = 6;
|
||
|
|
num6 = table;
|
||
|
|
num6 = InfTree.inflate_trees_dynamic(257 + (num6 & 0x1F), 1 + ((num6 >> 5) & 0x1F), blens, array, array2, array3, array4, hufts, z);
|
||
|
|
if (num6 != 0)
|
||
|
|
{
|
||
|
|
if (num6 == -3)
|
||
|
|
{
|
||
|
|
blens = null;
|
||
|
|
mode = 9;
|
||
|
|
}
|
||
|
|
r = num6;
|
||
|
|
bitb = num3;
|
||
|
|
bitk = i;
|
||
|
|
z.avail_in = num2;
|
||
|
|
z.total_in += num - z.next_in_index;
|
||
|
|
z.next_in_index = num;
|
||
|
|
write = num4;
|
||
|
|
return inflate_flush(z, r);
|
||
|
|
}
|
||
|
|
codes = new InfCodes(array[0], array2[0], hufts, array3[0], hufts, array4[0], z);
|
||
|
|
blens = null;
|
||
|
|
mode = 6;
|
||
|
|
goto case 6;
|
||
|
|
}
|
||
|
|
case 6:
|
||
|
|
bitb = num3;
|
||
|
|
bitk = i;
|
||
|
|
z.avail_in = num2;
|
||
|
|
z.total_in += num - z.next_in_index;
|
||
|
|
z.next_in_index = num;
|
||
|
|
write = num4;
|
||
|
|
if ((r = codes.proc(this, z, r)) != 1)
|
||
|
|
{
|
||
|
|
return inflate_flush(z, r);
|
||
|
|
}
|
||
|
|
r = 0;
|
||
|
|
codes.free(z);
|
||
|
|
num = z.next_in_index;
|
||
|
|
num2 = z.avail_in;
|
||
|
|
num3 = bitb;
|
||
|
|
i = bitk;
|
||
|
|
num4 = write;
|
||
|
|
num5 = ((num4 < read) ? (read - num4 - 1) : (end - num4));
|
||
|
|
if (last == 0)
|
||
|
|
{
|
||
|
|
mode = 0;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
mode = 7;
|
||
|
|
goto case 7;
|
||
|
|
case 7:
|
||
|
|
write = num4;
|
||
|
|
r = inflate_flush(z, r);
|
||
|
|
num4 = write;
|
||
|
|
num5 = ((num4 < read) ? (read - num4 - 1) : (end - num4));
|
||
|
|
if (read != write)
|
||
|
|
{
|
||
|
|
bitb = num3;
|
||
|
|
bitk = i;
|
||
|
|
z.avail_in = num2;
|
||
|
|
z.total_in += num - z.next_in_index;
|
||
|
|
z.next_in_index = num;
|
||
|
|
write = num4;
|
||
|
|
return inflate_flush(z, r);
|
||
|
|
}
|
||
|
|
mode = 8;
|
||
|
|
goto case 8;
|
||
|
|
case 8:
|
||
|
|
r = 1;
|
||
|
|
bitb = num3;
|
||
|
|
bitk = i;
|
||
|
|
z.avail_in = num2;
|
||
|
|
z.total_in += num - z.next_in_index;
|
||
|
|
z.next_in_index = num;
|
||
|
|
write = num4;
|
||
|
|
return inflate_flush(z, r);
|
||
|
|
case 9:
|
||
|
|
r = -3;
|
||
|
|
bitb = num3;
|
||
|
|
bitk = i;
|
||
|
|
z.avail_in = num2;
|
||
|
|
z.total_in += num - z.next_in_index;
|
||
|
|
z.next_in_index = num;
|
||
|
|
write = num4;
|
||
|
|
return inflate_flush(z, r);
|
||
|
|
default:
|
||
|
|
r = -2;
|
||
|
|
bitb = num3;
|
||
|
|
bitk = i;
|
||
|
|
z.avail_in = num2;
|
||
|
|
z.total_in += num - z.next_in_index;
|
||
|
|
z.next_in_index = num;
|
||
|
|
write = num4;
|
||
|
|
return inflate_flush(z, r);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
internal void free(ZStream z)
|
||
|
|
{
|
||
|
|
reset(z, null);
|
||
|
|
window = null;
|
||
|
|
hufts = null;
|
||
|
|
}
|
||
|
|
|
||
|
|
internal void set_dictionary(byte[] d, int start, int n)
|
||
|
|
{
|
||
|
|
Array.Copy(d, start, window, 0, n);
|
||
|
|
read = (write = n);
|
||
|
|
}
|
||
|
|
|
||
|
|
internal int sync_point()
|
||
|
|
{
|
||
|
|
if (mode != 1)
|
||
|
|
{
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
internal int inflate_flush(ZStream z, int r)
|
||
|
|
{
|
||
|
|
int next_out_index = z.next_out_index;
|
||
|
|
int num = read;
|
||
|
|
int num2 = ((num <= write) ? write : end) - num;
|
||
|
|
if (num2 > z.avail_out)
|
||
|
|
{
|
||
|
|
num2 = z.avail_out;
|
||
|
|
}
|
||
|
|
if (num2 != 0 && r == -5)
|
||
|
|
{
|
||
|
|
r = 0;
|
||
|
|
}
|
||
|
|
z.avail_out -= num2;
|
||
|
|
z.total_out += num2;
|
||
|
|
if (checkfn != null)
|
||
|
|
{
|
||
|
|
z.adler = (check = z._adler.adler32(check, window, num, num2));
|
||
|
|
}
|
||
|
|
Array.Copy(window, num, z.next_out, next_out_index, num2);
|
||
|
|
next_out_index += num2;
|
||
|
|
num += num2;
|
||
|
|
if (num == end)
|
||
|
|
{
|
||
|
|
num = 0;
|
||
|
|
if (write == end)
|
||
|
|
{
|
||
|
|
write = 0;
|
||
|
|
}
|
||
|
|
num2 = write - num;
|
||
|
|
if (num2 > z.avail_out)
|
||
|
|
{
|
||
|
|
num2 = z.avail_out;
|
||
|
|
}
|
||
|
|
if (num2 != 0 && r == -5)
|
||
|
|
{
|
||
|
|
r = 0;
|
||
|
|
}
|
||
|
|
z.avail_out -= num2;
|
||
|
|
z.total_out += num2;
|
||
|
|
if (checkfn != null)
|
||
|
|
{
|
||
|
|
z.adler = (check = z._adler.adler32(check, window, num, num2));
|
||
|
|
}
|
||
|
|
Array.Copy(window, num, z.next_out, next_out_index, num2);
|
||
|
|
next_out_index += num2;
|
||
|
|
num += num2;
|
||
|
|
}
|
||
|
|
z.next_out_index = next_out_index;
|
||
|
|
read = num;
|
||
|
|
return r;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|