410 lines
8.9 KiB
C#
410 lines
8.9 KiB
C#
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namespace ComponentAce.Compression.Libs.zlib
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{
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internal sealed class Inflate
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{
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private const int MAX_WBITS = 15;
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private const int PRESET_DICT = 32;
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internal const int Z_NO_FLUSH = 0;
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internal const int Z_PARTIAL_FLUSH = 1;
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internal const int Z_SYNC_FLUSH = 2;
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internal const int Z_FULL_FLUSH = 3;
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internal const int Z_FINISH = 4;
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private const int Z_DEFLATED = 8;
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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 METHOD = 0;
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private const int FLAG = 1;
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private const int DICT4 = 2;
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private const int DICT3 = 3;
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private const int DICT2 = 4;
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private const int DICT1 = 5;
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private const int DICT0 = 6;
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private const int BLOCKS = 7;
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private const int CHECK4 = 8;
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private const int CHECK3 = 9;
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private const int CHECK2 = 10;
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private const int CHECK1 = 11;
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private const int DONE = 12;
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private const int BAD = 13;
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internal int mode;
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internal int method;
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internal long[] was = new long[1];
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internal long need;
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internal int marker;
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internal int nowrap;
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internal int wbits;
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internal InfBlocks blocks;
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private static byte[] mark = new byte[4]
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{
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0,
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0,
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(byte)SupportClass.Identity(255L),
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(byte)SupportClass.Identity(255L)
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};
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internal int inflateReset(ZStream z)
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{
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if (z == null || z.istate == null)
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{
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return -2;
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}
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z.total_in = (z.total_out = 0L);
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z.msg = null;
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z.istate.mode = ((z.istate.nowrap != 0) ? 7 : 0);
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z.istate.blocks.reset(z, null);
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return 0;
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}
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internal int inflateEnd(ZStream z)
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{
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if (blocks != null)
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{
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blocks.free(z);
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}
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blocks = null;
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return 0;
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}
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internal int inflateInit(ZStream z, int w)
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{
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z.msg = null;
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blocks = null;
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nowrap = 0;
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if (w < 0)
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{
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w = -w;
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nowrap = 1;
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}
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if (w < 8 || w > 15)
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{
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inflateEnd(z);
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return -2;
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}
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wbits = w;
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z.istate.blocks = new InfBlocks(z, (z.istate.nowrap != 0) ? null : this, 1 << w);
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inflateReset(z);
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return 0;
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}
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internal int inflate(ZStream z, int f)
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{
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if (z == null || z.istate == null || z.next_in == null)
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{
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return -2;
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}
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f = ((f == 4) ? (-5) : 0);
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int num = -5;
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while (true)
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{
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switch (z.istate.mode)
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{
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case 0:
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if (z.avail_in == 0)
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{
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return num;
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}
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num = f;
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z.avail_in--;
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z.total_in++;
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if (((z.istate.method = z.next_in[z.next_in_index++]) & 0xF) != 8)
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{
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z.istate.mode = 13;
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z.msg = "unknown compression method";
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z.istate.marker = 5;
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break;
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}
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if ((z.istate.method >> 4) + 8 > z.istate.wbits)
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{
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z.istate.mode = 13;
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z.msg = "invalid window size";
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z.istate.marker = 5;
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break;
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}
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z.istate.mode = 1;
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goto case 1;
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case 1:
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{
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if (z.avail_in == 0)
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{
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return num;
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}
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num = f;
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z.avail_in--;
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z.total_in++;
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int num2 = z.next_in[z.next_in_index++] & 0xFF;
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if (((z.istate.method << 8) + num2) % 31 != 0)
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{
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z.istate.mode = 13;
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z.msg = "incorrect header check";
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z.istate.marker = 5;
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break;
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}
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if ((num2 & 0x20) == 0)
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{
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z.istate.mode = 7;
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break;
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}
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z.istate.mode = 2;
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goto case 2;
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}
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case 2:
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if (z.avail_in == 0)
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{
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return num;
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}
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num = f;
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z.avail_in--;
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z.total_in++;
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z.istate.need = ((z.next_in[z.next_in_index++] & 0xFF) << 24) & -16777216;
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z.istate.mode = 3;
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goto case 3;
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case 3:
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if (z.avail_in == 0)
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{
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return num;
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}
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num = f;
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z.avail_in--;
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z.total_in++;
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z.istate.need += (long)((ulong)((z.next_in[z.next_in_index++] & 0xFF) << 16) & 0xFF0000uL);
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z.istate.mode = 4;
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goto case 4;
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case 4:
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if (z.avail_in == 0)
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{
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return num;
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}
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num = f;
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z.avail_in--;
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z.total_in++;
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z.istate.need += (long)((ulong)((z.next_in[z.next_in_index++] & 0xFF) << 8) & 0xFF00uL);
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z.istate.mode = 5;
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goto case 5;
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case 5:
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if (z.avail_in == 0)
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{
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return num;
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}
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num = f;
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z.avail_in--;
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z.total_in++;
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z.istate.need += (long)((ulong)z.next_in[z.next_in_index++] & 0xFFuL);
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z.adler = z.istate.need;
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z.istate.mode = 6;
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return 2;
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case 6:
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z.istate.mode = 13;
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z.msg = "need dictionary";
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z.istate.marker = 0;
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return -2;
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case 7:
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num = z.istate.blocks.proc(z, num);
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switch (num)
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{
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case -3:
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z.istate.mode = 13;
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z.istate.marker = 0;
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goto end_IL_0031;
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case 0:
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num = f;
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break;
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}
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if (num != 1)
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{
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return num;
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}
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num = f;
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z.istate.blocks.reset(z, z.istate.was);
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if (z.istate.nowrap != 0)
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{
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z.istate.mode = 12;
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break;
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}
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z.istate.mode = 8;
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goto case 8;
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case 8:
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if (z.avail_in == 0)
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{
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return num;
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}
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num = f;
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z.avail_in--;
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z.total_in++;
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z.istate.need = ((z.next_in[z.next_in_index++] & 0xFF) << 24) & -16777216;
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z.istate.mode = 9;
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goto case 9;
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case 9:
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if (z.avail_in == 0)
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{
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return num;
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}
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num = f;
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z.avail_in--;
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z.total_in++;
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z.istate.need += (long)((ulong)((z.next_in[z.next_in_index++] & 0xFF) << 16) & 0xFF0000uL);
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z.istate.mode = 10;
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goto case 10;
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case 10:
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if (z.avail_in == 0)
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{
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return num;
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}
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num = f;
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z.avail_in--;
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z.total_in++;
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z.istate.need += (long)((ulong)((z.next_in[z.next_in_index++] & 0xFF) << 8) & 0xFF00uL);
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z.istate.mode = 11;
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goto case 11;
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case 11:
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if (z.avail_in == 0)
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{
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return num;
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}
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num = f;
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z.avail_in--;
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z.total_in++;
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z.istate.need += (long)((ulong)z.next_in[z.next_in_index++] & 0xFFuL);
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if ((int)z.istate.was[0] != (int)z.istate.need)
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{
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z.istate.mode = 13;
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z.msg = "incorrect data check";
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z.istate.marker = 5;
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break;
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}
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z.istate.mode = 12;
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goto case 12;
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case 12:
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return 1;
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case 13:
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return -3;
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default:
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{
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return -2;
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}
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end_IL_0031:
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break;
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}
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}
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}
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internal int inflateSetDictionary(ZStream z, byte[] dictionary, int dictLength)
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{
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int start = 0;
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int num = dictLength;
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if (z == null || z.istate == null || z.istate.mode != 6)
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{
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return -2;
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}
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if (z._adler.adler32(1L, dictionary, 0, dictLength) != z.adler)
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{
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return -3;
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}
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z.adler = z._adler.adler32(0L, null, 0, 0);
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if (num >= 1 << z.istate.wbits)
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{
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num = (1 << z.istate.wbits) - 1;
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start = dictLength - num;
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}
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z.istate.blocks.set_dictionary(dictionary, start, num);
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z.istate.mode = 7;
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return 0;
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}
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internal int inflateSync(ZStream z)
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{
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if (z == null || z.istate == null)
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{
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return -2;
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}
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if (z.istate.mode != 13)
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{
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z.istate.mode = 13;
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z.istate.marker = 0;
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}
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int num;
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if ((num = z.avail_in) == 0)
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{
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return -5;
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}
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int num2 = z.next_in_index;
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int num3 = z.istate.marker;
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while (num != 0 && num3 < 4)
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{
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num3 = ((z.next_in[num2] != mark[num3]) ? ((z.next_in[num2] == 0) ? (4 - num3) : 0) : (num3 + 1));
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num2++;
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num--;
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}
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z.total_in += num2 - z.next_in_index;
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z.next_in_index = num2;
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z.avail_in = num;
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z.istate.marker = num3;
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if (num3 != 4)
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{
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return -3;
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}
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long total_in = z.total_in;
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long total_out = z.total_out;
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inflateReset(z);
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z.total_in = total_in;
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z.total_out = total_out;
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z.istate.mode = 7;
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return 0;
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}
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internal int inflateSyncPoint(ZStream z)
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{
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if (z == null || z.istate == null || z.istate.blocks == null)
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{
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return -2;
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}
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return z.istate.blocks.sync_point();
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}
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}
|
||
|
|
}
|