public IpsStudy Study(Stream patch)
{
IpsStudy study = new IpsStudy();
study.Error = IpsError.IpsInvalid;
if (patch.Length < 8)
{
return(study);
}
// If 'PATCH' text was not found, return IPS was invalid error.
byte[] header = new byte[Patcher.PatchText.Length];
patch.Read(header, 0, Patcher.PatchText.Length);
if (!Enumerable.SequenceEqual(header, System.Text.Encoding.ASCII.GetBytes(Patcher.PatchText)))
{
return(study);
}
int offset = Reader.Read24(patch);
int outlen = 0;
int thisout = 0;
int lastoffset = 0;
bool w_scrambled = false;
bool w_notthis = false;
while (offset != Patcher.EndOfFile)
{
int size = Reader.Read16(patch);
if (size == 0)
{
thisout = offset + Reader.Read16(patch);
Reader.Read8(patch);
}
else
{
thisout = offset + size;
patch.Seek(size, SeekOrigin.Current);
}
if (offset < lastoffset)
{
w_scrambled = true;
}
lastoffset = offset;
if (thisout > outlen)
{
outlen = thisout;
}
if (patch.Position >= patch.Length)
{
return(study);
}
offset = Reader.Read24(patch);
}
study.OutlenMinMem = outlen;
study.OutlenMax = 0xFFFFFFFF;
if (patch.Position + 3 == patch.Length)
{
int truncate = Reader.Read24(patch);
study.OutlenMax = truncate;
if (outlen > truncate)
{
outlen = truncate;
w_notthis = true;
}
}
if (patch.Position != patch.Length)
{
return(study);
}
study.OutlenMin = outlen;
study.Error = IpsError.IpsOk;
if (w_notthis)
{
study.Error = IpsError.IpsNotThis;
}
if (w_scrambled)
{
study.Error = IpsError.IpsScrambled;
}
return(study);
}
public IpsStudy Study(Stream patch)
{
IpsStudy study = new IpsStudy();
study.Error = IpsError.IpsInvalid;
if (patch.Length < 8) return study;
// If 'PATCH' text was not found, return IPS was invalid error.
byte[] header = new byte[Patcher.PatchText.Length];
patch.Read(header, 0, Patcher.PatchText.Length);
if (!Enumerable.SequenceEqual(header, System.Text.Encoding.ASCII.GetBytes(Patcher.PatchText))) return study;
int offset = Reader.Read24(patch);
int outlen = 0;
int thisout = 0;
int lastoffset = 0;
bool w_scrambled = false;
bool w_notthis = false;
while (offset != Patcher.EndOfFile)
{
int size = Reader.Read16(patch);
if (size == 0)
{
thisout = offset + Reader.Read16(patch);
Reader.Read8(patch);
}
else
{
thisout = offset + size;
patch.Seek(size, SeekOrigin.Current);
}
if (offset < lastoffset) w_scrambled = true;
lastoffset = offset;
if (thisout > outlen) outlen = thisout;
if (patch.Position >= patch.Length) return study;
offset = Reader.Read24(patch);
}
study.OutlenMinMem = outlen;
study.OutlenMax = 0xFFFFFFFF;
if (patch.Position + 3 == patch.Length)
{
int truncate = Reader.Read24(patch);
study.OutlenMax = truncate;
if (outlen > truncate)
{
outlen = truncate;
w_notthis = true;
}
}
if (patch.Position != patch.Length) return study;
study.OutlenMin = outlen;
study.Error = IpsError.IpsOk;
if (w_notthis) study.Error = IpsError.IpsNotThis;
if (w_scrambled) study.Error = IpsError.IpsScrambled;
return study;
}