protected internal virtual LhaEntry ReadHeader_Lv2(byte[] @base)
{
LhaEntry e = new LhaEntry();
e.SetMethod(encoding.GetString(@base, HDR2_OFF_METHOD, 5));
e.SetCompressedSize(Get32(@base, HDR2_OFF_COMPSIZE));
e.SetOriginalSize(Get32(@base, HDR2_OFF_ORIGSIZE));
e.SetHeaderTimeStamp(Get32(@base, HDR2_OFF_TIMESTAMP));
calcCRC.Update(@base, 0, @base.Length);
byte[] buf = new byte[2];
if (binaryReader.Read(buf, 0, buf.Length) != buf.Length)
{
throw (new LhaException("Lha header is broken (cannot read crc value)"));
}
e.SetCRC(Get16(buf, 0));
calcCRC.Update(buf, 0, buf.Length);
buf = new byte[1];
if (binaryReader.Read(buf, 0, buf.Length) != buf.Length)
{
throw (new LhaException("Lha header is broken (cannot read os signature)"));
}
e.SetOS(buf[0]);
calcCRC.Update(buf, 0, buf.Length);
buf = new byte[2];
if (binaryReader.Read(buf, 0, buf.Length) != buf.Length)
{
throw (new LhaException("Lha header is broken (cannot read ext)"));
}
calcCRC.Update(buf, 0, buf.Length);
for (int next = Get16(buf, 0); next > 0; next = ReadExHeader(e, next))
{
;
}
e.SetPath(dirName + fileName);
return(e);
}
protected internal virtual LhaEntry ReadHeader_Lv1(byte[] @base)
{
LhaEntry e = new LhaEntry();
flagSum = true;
srcSum = @base[HDR1_OFF_SUM];
if (srcSum < 0)
{
srcSum += 256;
}
e.SetMethod(encoding.GetString(@base, HDR1_OFF_METHOD, 5));
e.SetOriginalSize(Get32(@base, HDR1_OFF_ORIGSIZE));
e.SetDosTimeStamp(Get32(@base, HDR1_OFF_TIMESTAMP));
if (@base[HDR1_OFF_19] != 0x20)
{
throw (new LhaException("Lha header is broken (offset 19 is not 0x20)"));
}
calcSum.Update(@base, 2, @base.Length - 2);
calcCRC.Update(@base, 0, @base.Length);
byte[] buf = new byte[1];
if (binaryReader.Read(buf, 0, buf.Length) != buf.Length)
{
throw (new LhaException("Lha header is broken (cannot read name size)"));
}
int nameSize = buf[0];
calcSum.Update(buf, 0, buf.Length);
calcCRC.Update(buf, 0, buf.Length);
string name = "";
if (nameSize > 0)
{
buf = new byte[nameSize];
if (binaryReader.Read(buf, 0, buf.Length) != buf.Length)
{
throw (new LhaException("Lha header is broken (cannot read name)"));
}
name = encoding.GetString(buf);
calcSum.Update(buf, 0, buf.Length);
calcCRC.Update(buf, 0, buf.Length);
}
buf = new byte[2];
if (binaryReader.Read(buf, 0, buf.Length) != buf.Length)
{
throw (new LhaException("Lha header is broken (cannot read crc value)"));
}
e.SetCRC(Get16(buf, 0));
calcSum.Update(buf, 0, buf.Length);
calcCRC.Update(buf, 0, buf.Length);
buf = new byte[1];
if (binaryReader.Read(buf, 0, buf.Length) != buf.Length)
{
throw (new LhaException("Lha header is broken (cannot read os signature)"));
}
e.SetOS(buf[0]);
calcSum.Update(buf, 0, buf.Length);
calcCRC.Update(buf, 0, buf.Length);
long extSize = 0;
buf = new byte[2];
if (binaryReader.Read(buf, 0, buf.Length) != buf.Length)
{
throw (new LhaException("Lha header is broken (cannot read ext)"));
}
calcSum.Update(buf, 0, buf.Length);
calcCRC.Update(buf, 0, buf.Length);
for (int next = Get16(buf, 0); next > 0; next = ReadExHeader(e, next))
{
extSize += next;
}
e.SetCompressedSize(Get32(@base, HDR0_OFF_COMPSIZE) - extSize);
if (fileName.Length > 0)
{
name = dirName + fileName;
}
else
{
name = ConvertFilePath(name, e.GetOS());
}
e.SetPath(name);
return(e);
}
protected internal virtual LhaEntry ReadHeader_Lv0(byte[] @base)
{
LhaEntry e = new LhaEntry();
flagSum = true;
int headerSize = @base[HDRU_OFF_HEADERSIZE];
srcSum = @base[HDR0_OFF_SUM];
if (srcSum < 0)
{
srcSum += 256;
}
e.SetMethod(encoding.GetString(@base, HDR0_OFF_METHOD, 5));
e.SetCompressedSize(Get32(@base, HDR0_OFF_COMPSIZE));
e.SetOriginalSize(Get32(@base, HDR0_OFF_ORIGSIZE));
e.SetDosTimeStamp(Get32(@base, HDR0_OFF_TIMESTAMP));
calcSum.Update(@base, 2, @base.Length - 2);
byte[] buf = new byte[1];
if (binaryReader.Read(buf, 0, buf.Length) != buf.Length)
{
throw (new LhaException("Lha header is broken (header size does'nt match)"));
}
int nameSize = buf[0];
calcSum.Update(buf, 0, buf.Length);
buf = new byte[nameSize];
if (binaryReader.Read(buf, 0, buf.Length) != buf.Length)
{
throw (new LhaException("Lha header is broken (cannot read name)"));
}
string name = encoding.GetString(buf);
calcSum.Update(buf, 0, buf.Length);
int diff = headerSize - nameSize;
if ((diff != 20) && (diff != 22) && (diff < 23))
{
throw (new LhaException("Lha header is broken (header size does'nt match)"));
}
e.SetOS(LhaEntry.OSID_SIG_GENERIC);
if (diff >= 22)
{
buf = new byte[2];
if (binaryReader.Read(buf, 0, buf.Length) != buf.Length)
{
throw (new LhaException("Lha header is broken (cannot read crc value)"));
}
e.SetCRC(Get16(buf, 0));
calcSum.Update(buf, 0, buf.Length);
}
if (diff >= 23)
{
buf = new byte[1];
if (binaryReader.Read(buf, 0, buf.Length) != buf.Length)
{
throw (new LhaException("Lha header is broken (cannot read os signature)"));
}
e.SetOS(buf[0]);
calcSum.Update(buf, 0, buf.Length);
}
if (diff > 23)
{
buf = new byte[diff - 24];
if (binaryReader.Read(buf, 0, buf.Length) != buf.Length)
{
throw (new LhaException("Lha header is broken (cannot read ext)"));
}
calcSum.Update(buf, 0, buf.Length);
}
e.SetPath(ConvertFilePath(name, e.GetOS()));
return(e);
}
