mirror of
https://github.com/GreemDev/Ryujinx.git
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fb1d9493a3
* 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 ad5eb5787cc5b27a4631cd46ef5f551c4ae95e51. * Small changes * Revert external enum renaming * Changes from feedback * Apply previous refactorings to the merged code
78 lines
No EOL
1.9 KiB
C#
78 lines
No EOL
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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} |