72 lines
1.4 KiB
C#
72 lines
1.4 KiB
C#
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namespace ComponentAce.Compression.Libs.zlib;
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internal sealed class Adler32
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{
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private const int BASE = 65521;
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private const int NMAX = 5552;
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internal long adler32(long adler, byte[] buf, int index, int len)
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{
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if (buf == null)
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{
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return 1L;
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}
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long num = adler & 0xFFFF;
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long num2 = (adler >> 16) & 0xFFFF;
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while (len > 0)
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{
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int num3 = ((len < 5552) ? len : 5552);
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len -= num3;
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while (num3 >= 16)
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{
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num += buf[index++] & 0xFF;
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num2 += num;
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num += buf[index++] & 0xFF;
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num2 += num;
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num += buf[index++] & 0xFF;
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num2 += num;
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num += buf[index++] & 0xFF;
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num2 += num;
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num += buf[index++] & 0xFF;
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num2 += num;
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num += buf[index++] & 0xFF;
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num2 += num;
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num += buf[index++] & 0xFF;
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num2 += num;
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num += buf[index++] & 0xFF;
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num2 += num;
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num += buf[index++] & 0xFF;
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num2 += num;
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num += buf[index++] & 0xFF;
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num2 += num;
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num += buf[index++] & 0xFF;
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num2 += num;
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num += buf[index++] & 0xFF;
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num2 += num;
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num += buf[index++] & 0xFF;
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num2 += num;
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num += buf[index++] & 0xFF;
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num2 += num;
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num += buf[index++] & 0xFF;
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num2 += num;
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num += buf[index++] & 0xFF;
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num2 += num;
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num3 -= 16;
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}
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if (num3 != 0)
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{
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do
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{
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num += buf[index++] & 0xFF;
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num2 += num;
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}
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while (--num3 != 0);
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}
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num %= 65521;
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num2 %= 65521;
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}
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return (num2 << 16) | num;
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}
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}
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