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Improve zlib decompression to support varied positions

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KillzXGaming 2019-11-10 11:14:09 -05:00
parent 132f312484
commit c3e070d981
1 changed files with 15 additions and 12 deletions
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25
Switch_Toolbox_Library/Compression/Formats/Zlib.cs
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@ -19,26 +19,29 @@ namespace Toolbox.Library
public bool Identify(Stream stream, string fileName)
{
if (stream.Length < 16) return false;
using (var reader = new FileReader(stream, true))
{
startPosition = stream.Position;
reader.SetByteOrder(true);
bool IsValid = false;
for (int i = 0; i < 4; i++)
{
ushort magicNumber = reader.ReadUInt16();
reader.ReadUInt16();
reader.Position = startPosition + 4;
ushort magicNumber2 = reader.ReadUInt16();
IsValid = magicNumber == 0x789C || magicNumber == 0x78DA;
if (IsValid)
{
startPosition = reader.Position - 4;
break;
}
}
//Check 2 cases which the file is zlibbed.
//One is that it is compressed with magic at start
//Another is a size (uint) then magic
bool IsValid = magicNumber == 0x789C || magicNumber == 0x78DA;
bool IsValid2 = magicNumber2 == 0x789C || magicNumber2 == 0x78DA;
if (IsValid2)
startPosition = stream.Position + 4;
return IsValid || IsValid2;
return IsValid;
}
}