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Merge pull request #1646 from NPBruce/dev/2.6
Rolling Dev/2.6 into master
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55 changes: 55 additions & 0 deletions
55
libraries/FFGAppImport/AssetImport/AssetStudio/7zip/Common/CRC.cs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,55 @@ | ||
| // Common/CRC.cs | ||
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| namespace SevenZip | ||
| { | ||
| public class CRC | ||
| { | ||
| public static readonly uint[] Table; | ||
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| static CRC() | ||
| { | ||
| Table = new uint[256]; | ||
| const uint kPoly = 0xEDB88320; | ||
| for (uint i = 0; i < 256; i++) | ||
| { | ||
| uint r = i; | ||
| for (int j = 0; j < 8; j++) | ||
| if ((r & 1) != 0) | ||
| r = (r >> 1) ^ kPoly; | ||
| else | ||
| r >>= 1; | ||
| Table[i] = r; | ||
| } | ||
| } | ||
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| uint _value = 0xFFFFFFFF; | ||
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| public void Init() { _value = 0xFFFFFFFF; } | ||
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| public void UpdateByte(byte b) | ||
| { | ||
| _value = Table[(((byte)(_value)) ^ b)] ^ (_value >> 8); | ||
| } | ||
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| public void Update(byte[] data, uint offset, uint size) | ||
| { | ||
| for (uint i = 0; i < size; i++) | ||
| _value = Table[(((byte)(_value)) ^ data[offset + i])] ^ (_value >> 8); | ||
| } | ||
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| public uint GetDigest() { return _value ^ 0xFFFFFFFF; } | ||
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| static uint CalculateDigest(byte[] data, uint offset, uint size) | ||
| { | ||
| CRC crc = new CRC(); | ||
| // crc.Init(); | ||
| crc.Update(data, offset, size); | ||
| return crc.GetDigest(); | ||
| } | ||
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| static bool VerifyDigest(uint digest, byte[] data, uint offset, uint size) | ||
| { | ||
| return (CalculateDigest(data, offset, size) == digest); | ||
| } | ||
| } | ||
| } |
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