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* Rename enum fields
* Naming conventions
* Remove unneeded ".this"
* Remove unneeded semicolons
* Remove unused Usings
* Don't use var
* Remove unneeded enum underlying types
* Explicitly label class visibility
* Remove unneeded @ prefixes
* Remove unneeded commas
* Remove unneeded if expressions
* Method doesn't use unsafe code
* Remove unneeded casts
* Initialized objects don't need an empty constructor
* Remove settings from DotSettings
* Revert "Explicitly label class visibility"
This reverts commit ad5eb5787c
.
* Small changes
* Revert external enum renaming
* Changes from feedback
* Remove unneeded property setters
78 lines
1.9 KiB
C#
78 lines
1.9 KiB
C#
using System;
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namespace Ryujinx.HLE.Loaders.Compression
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{
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static class Lz4
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{
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public static byte[] Decompress(byte[] cmp, int decLength)
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{
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byte[] dec = new byte[decLength];
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int cmpPos = 0;
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int decPos = 0;
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int GetLength(int length)
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{
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byte sum;
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if (length == 0xf)
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{
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do
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{
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length += (sum = cmp[cmpPos++]);
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}
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while (sum == 0xff);
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}
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return length;
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}
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do
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{
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byte token = cmp[cmpPos++];
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int encCount = (token >> 0) & 0xf;
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int litCount = (token >> 4) & 0xf;
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//Copy literal chunck
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litCount = GetLength(litCount);
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Buffer.BlockCopy(cmp, cmpPos, dec, decPos, litCount);
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cmpPos += litCount;
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decPos += litCount;
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if (cmpPos >= cmp.Length)
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{
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break;
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}
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//Copy compressed chunck
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int back = cmp[cmpPos++] << 0 |
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cmp[cmpPos++] << 8;
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encCount = GetLength(encCount) + 4;
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int encPos = decPos - back;
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if (encCount <= back)
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{
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Buffer.BlockCopy(dec, encPos, dec, decPos, encCount);
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decPos += encCount;
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}
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else
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{
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while (encCount-- > 0)
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{
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dec[decPos++] = dec[encPos++];
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}
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}
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}
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while (cmpPos < cmp.Length &&
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decPos < dec.Length);
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return dec;
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}
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}
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} |