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- [Core] Remove
K4os.Compression.LZ4
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,143 @@ | ||
| using System; | ||
|
|
||
| namespace AssetStudio.LZ4; | ||
| public static class LZ4 | ||
| { | ||
| public static int Decompress(ReadOnlySpan<byte> cmp, Span<byte> dec) | ||
| { | ||
| int cmpPos = 0; | ||
| int decPos = 0; | ||
|
|
||
| // ReSharper disable once VariableHidesOuterVariable | ||
| int GetLength(int length, ReadOnlySpan<byte> cmp) | ||
| { | ||
| byte sum; | ||
|
|
||
| if (length == 0xf) | ||
| { | ||
| do | ||
| { | ||
| length += sum = cmp[cmpPos++]; | ||
| } while (sum == 0xff); | ||
| } | ||
|
|
||
| return length; | ||
| } | ||
|
|
||
| do | ||
| { | ||
| byte token = cmp[cmpPos++]; | ||
|
|
||
| int encCount = (token >> 0) & 0xf; | ||
| int litCount = (token >> 4) & 0xf; | ||
|
|
||
| //Copy literal chunk | ||
| litCount = GetLength(litCount, cmp); | ||
|
|
||
| cmp.Slice(cmpPos, litCount).CopyTo(dec.Slice(decPos)); | ||
|
|
||
| cmpPos += litCount; | ||
| decPos += litCount; | ||
|
|
||
| if (cmpPos >= cmp.Length) | ||
| { | ||
| break; | ||
| } | ||
|
|
||
| //Copy compressed chunk | ||
| int back = cmp[cmpPos++] << 0 | | ||
| cmp[cmpPos++] << 8; | ||
|
|
||
| encCount = GetLength(encCount, cmp) + 4; | ||
|
|
||
| int encPos = decPos - back; | ||
|
|
||
| if (encCount <= back) | ||
| { | ||
| dec.Slice(encPos, encCount).CopyTo(dec.Slice(decPos)); | ||
|
|
||
| decPos += encCount; | ||
| } | ||
| else | ||
| { | ||
| while (encCount-- > 0) | ||
| { | ||
| dec[decPos++] = dec[encPos++]; | ||
| } | ||
| } | ||
| } while (cmpPos < cmp.Length && | ||
| decPos < dec.Length); | ||
|
|
||
| return decPos; | ||
| } | ||
| } | ||
| public static class LZ4Inv | ||
| { | ||
| public static int Decompress(ReadOnlySpan<byte> cmp, Span<byte> dec) | ||
| { | ||
| int cmpPos = 0; | ||
| int decPos = 0; | ||
|
|
||
| // ReSharper disable once VariableHidesOuterVariable | ||
| int GetLength(int length, ReadOnlySpan<byte> cmp) | ||
| { | ||
| byte sum; | ||
|
|
||
| if (length == 0xf) | ||
| { | ||
| do | ||
| { | ||
| length += sum = cmp[cmpPos++]; | ||
| } while (sum == 0xff); | ||
| } | ||
|
|
||
| return length; | ||
| } | ||
|
|
||
| do | ||
| { | ||
| byte token = cmp[cmpPos++]; | ||
|
|
||
| int encCount = (token >> 4) & 0xf; | ||
| int litCount = (token >> 0) & 0xf; | ||
|
|
||
| //Copy literal chunk | ||
| litCount = GetLength(litCount, cmp); | ||
|
|
||
| cmp.Slice(cmpPos, litCount).CopyTo(dec.Slice(decPos)); | ||
|
|
||
| cmpPos += litCount; | ||
| decPos += litCount; | ||
|
|
||
| if (cmpPos >= cmp.Length) | ||
| { | ||
| break; | ||
| } | ||
|
|
||
| //Copy compressed chunk | ||
| int back = cmp[cmpPos++] << 8 | | ||
| cmp[cmpPos++] << 0; | ||
|
|
||
| encCount = GetLength(encCount, cmp) + 4; | ||
|
|
||
| int encPos = decPos - back; | ||
|
|
||
| if (encCount <= back) | ||
| { | ||
| dec.Slice(encPos, encCount).CopyTo(dec.Slice(decPos)); | ||
|
|
||
| decPos += encCount; | ||
| } | ||
| else | ||
| { | ||
| while (encCount-- > 0) | ||
| { | ||
| dec[decPos++] = dec[encPos++]; | ||
| } | ||
| } | ||
| } while (cmpPos < cmp.Length && | ||
| decPos < dec.Length); | ||
|
|
||
| return decPos; | ||
| } | ||
| } |
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