Bussun/BMGEditor
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idk

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I just don't know
btw as of rn credits to EveryFileExplorer
This commit is contained in:
Denis
2022-01-16 14:58:06 +01:00
parent 148839f15d
commit fed05696b8
1 changed files with 23 additions and 34 deletions
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57
BMGEditor/FS/Compression.cs
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@@ -2,54 +2,43 @@
namespace BMGEditor
{
public static class Yaz0 // ONLY WORKS WITH BIG ENDIAN - TO REWRITE !!
public static class Yaz0 // TODO: Finish rewriting this
{
// inspired from http://www.amnoid.de/gc/yaz0.txt
public static void Decompress(ref byte[] data)
{
if (data[0] != 'Y' || data[1] != 'a' || data[2] != 'z' || data[3] != '0')
return;
int fullsize = (data[4] << 24) | (data[5] << 16) | (data[6] << 8) | data[7];
byte[] output = new byte[fullsize];
int inpos = 16, outpos = 0;
while (outpos < fullsize)
Int32 decompSize = (data[4] << 24 | data[5] << 16 | data[6] << 8 | data[7]);
byte[] output = new byte[decompSize];
int Offs = 16;
int dstoffs = 0;
while (true)
{
byte block = data[inpos++];
byte header = data[Offs++];
for (int i = 0; i < 8; i++)
{
if ((block & 0x80) != 0)
{
// copy one plain byte
output[outpos++] = data[inpos++];
}
if ((header & 0x80) != 0) output[dstoffs++] = data[Offs++];
else
{
// copy N compressed bytes
byte b1 = data[inpos++];
byte b2 = data[inpos++];
int dist = ((b1 & 0xF) << 8) | b2;
int copysrc = outpos - (dist + 1);
int nbytes = b1 >> 4;
if (nbytes == 0) nbytes = data[inpos++] + 0x12;
else nbytes += 2;
for (int j = 0; j < nbytes; j++)
output[outpos++] = output[copysrc++];
byte b = data[Offs++];
int offs = ((b & 0xF) << 8 | data[Offs++]) + 1;
int length = (b >> 4) + 2;
if (length == 2) length = data[Offs++] + 0x12;
for (int j = 0; j < length; j++)
{
output[dstoffs] = output[dstoffs - offs];
dstoffs++;
}
}
block <<= 1;
if (outpos >= fullsize || inpos >= data.Length)
break;
if (dstoffs >= decompSize)
{
Array.Resize(ref data, decompSize);
output.CopyTo(data, 0);
}
header <<= 1;
}
}
Array.Resize(ref data, fullsize);
output.CopyTo(data, 0);
}
}
}