private unsafe void method_20(
Class442 page,
MemoryStream sectionStream,
ulong crcSeed,
ulong pageSize,
out byte[] pageData)
{
page.CrcSeed = crcSeed;
page.DecompressedSize = (ulong)sectionStream.Length;
page.DecompressedCrc = Class656.class656_1.method_0(sectionStream.GetBuffer(), 0U, (uint)sectionStream.Length, Class656.smethod_0(crcSeed, (uint)sectionStream.Length));
MemoryStream memoryStream = new MemoryStream();
new Class955().method_1(sectionStream.GetBuffer(), 0, (int)sectionStream.Length, (Stream)memoryStream);
if (memoryStream.Length >= sectionStream.Length)
{
memoryStream = sectionStream;
}
page.CompressedSize = (ulong)memoryStream.Length;
page.CompressedCrc = Class656.class656_1.method_0(memoryStream.GetBuffer(), 0U, (uint)memoryStream.Length, Class656.smethod_0(crcSeed, (uint)memoryStream.Length));
ulong num1 = (ulong)(memoryStream.Length + 8L - 1L & -8L);
int num2 = (int)((long)num1 - memoryStream.Length);
for (int index = 0; index < num2; ++index)
{
memoryStream.WriteByte((byte)0);
}
ulong num3 = pageSize / (ulong)byte.MaxValue;
ulong num4 = num3 * (ulong)Class746.class746_0.K;
page.DataRepeatCount = num4 / num1;
for (int index = 1; index < (int)page.DataRepeatCount; ++index)
{
memoryStream.Write(memoryStream.GetBuffer(), 0, (int)num1);
}
pageData = new byte[pageSize];
fixed(byte *source = memoryStream.GetBuffer())
fixed(byte *destination = pageData)
{
uint num5 = (uint)(this.method_28(destination, source, (int)memoryStream.Length, Class746.class746_0) * (int)byte.MaxValue);
byte *pagePtr = destination + (int)num5;
uint num6 = (uint)num3 * (uint)byte.MaxValue;
uint num7 = num6 - num5;
for (int index = 0; (long)index < (long)num7; ++index)
{
*pagePtr++ = (byte)0;
}
uint paddingSize = (uint)pageSize - num6;
this.method_24(pagePtr, paddingSize);
if (pagePtr + (int)paddingSize - destination != (long)pageSize)
{
throw new Exception();
}
}
}
private unsafe void method_22(
Class504 section,
byte[] buffer,
ulong position,
ulong uncompressedLength)
{
Class443 class443 = new Class443();
class443.PageSize = section.MaxDecompressedPageSize;
class443.DataOffset = position;
class443.DecompressedSize = uncompressedLength;
class443.CheckSum = (ulong)Class996.smethod_3((ulong)this.uint_0, buffer, (uint)position, (uint)uncompressedLength);
Class746 class7461 = Class746.class746_1;
MemoryStream memoryStream = new MemoryStream();
if (section.Compressed)
{
new Class955().method_1(buffer, (int)position, (int)uncompressedLength, (Stream)memoryStream);
if (memoryStream.Length >= (long)uncompressedLength)
{
memoryStream = new MemoryStream();
memoryStream.Write(buffer, (int)position, (int)uncompressedLength);
}
}
else
{
memoryStream.Write(buffer, (int)position, (int)uncompressedLength);
}
class443.CompressedSize = (ulong)memoryStream.Length;
class443.Crc = Class656.class656_1.method_0(memoryStream.GetBuffer(), 0U, (uint)memoryStream.Length, Class656.smethod_0((ulong)this.uint_0, (uint)memoryStream.Length));
ulong num1 = (ulong)(memoryStream.Length + 8L - 1L & -8L);
int num2 = (int)((ulong)((long)num1 + (long)class7461.K - 1L) / (ulong)class7461.K);
byte[] data;
if (section.Encoding == 4UL)
{
data = new byte[(long)num2 * (long)class7461.N];
int num3 = (int)((long)num1 - memoryStream.Length);
for (int index = 0; index < num3; ++index)
{
memoryStream.WriteByte((byte)0);
fixed(byte *destination = data)
fixed(byte *source = memoryStream.GetBuffer())
this.method_28(destination, source, (int)memoryStream.Length, class7461);
}
else
{
if (section.Encoding != 1UL)
{
throw new Exception();
}
uint num3 = (uint)(num1 - (ulong)memoryStream.Length);
for (uint index = 0; index < num3; ++index)
{
memoryStream.WriteByte((byte)0);
}
data = new byte[num1 + (ulong)num2 * (ulong)(class7461.N - class7461.K)];
fixed(byte *dataBufferPtr = data)
fixed(byte *sourcePtr = memoryStream.GetBuffer())
this.method_26(dataBufferPtr, dataBufferPtr + num1, sourcePtr, (int)memoryStream.Length, class7461);
}
this.method_23((Class441)class443, data, 0, data.Length);
if (class443.Id > 0L)
{
++section.PageCount;
}
section.Pages.Add(class443);
}
private unsafe void method_1()
{
this.stream_0.Position = this.stream_0.Length;
this.class954_0.FileSize = (ulong)(this.stream_0.Length + 1024L);
this.class954_0.Header2Offset = (ulong)(this.stream_0.Position - 1152L);
this.class954_0.SectionsMapCrcSeed = this.class995_0.method_2((uint)this.class954_0.SectionsMapCrcSeed);
this.class954_0.PagesMapCrcSeed = this.class995_0.method_2((uint)this.class954_0.PagesMapCrcSeed);
Class888 class888 = new Class888();
class888.method_0(this.class954_0.CrcSeed, this.class995_0);
this.class954_0.CrcSeedEncoded = this.class995_0.method_2((uint)(this.class954_0.CrcSeed & (ulong)ushort.MaxValue));
MemoryStream memoryStream1 = new MemoryStream();
Class889 byteStream = Class889.Create((Stream)memoryStream1, this.dxfVersion_0, this.encoding_0);
this.method_3(byteStream);
ulong num1 = Class656.class656_0.method_0(memoryStream1.GetBuffer(), 0U, (uint)memoryStream1.Length, Class656.smethod_1(0UL, (uint)memoryStream1.Length));
memoryStream1.Position = 264L;
byteStream.vmethod_15(num1);
Class955 class955 = new Class955();
MemoryStream memoryStream2 = new MemoryStream();
class955.method_1(memoryStream1.GetBuffer(), 0, (int)memoryStream1.Length, (Stream)memoryStream2);
if (memoryStream2.Length >= memoryStream1.Length)
{
memoryStream2 = memoryStream1;
}
ulong num2 = Class656.class656_0.method_0(memoryStream2.GetBuffer(), 0U, (uint)memoryStream2.Length, Class656.smethod_1(0UL, (uint)memoryStream2.Length));
MemoryStream memoryStream3 = new MemoryStream(12);
Class889 class889_1 = Class889.Create((Stream)memoryStream3, this.dxfVersion_0, this.encoding_0);
ulong control = this.class995_0.method_1();
class889_1.vmethod_15(control);
class889_1.vmethod_15(Class888.smethod_0(control, control));
ulong num3 = Class656.class656_0.method_0(memoryStream3.GetBuffer(), 0U, (uint)memoryStream3.Length, Class656.smethod_0(0UL, (uint)memoryStream3.Length));
MemoryStream memoryStream4 = new MemoryStream(1024);
Class889 class889_2 = Class889.Create((Stream)memoryStream4, this.dxfVersion_0, this.encoding_0);
class889_2.vmethod_15(num3);
class889_2.vmethod_15(control);
class889_2.vmethod_15(num2);
if (memoryStream2.Length < 272L)
{
class889_2.vmethod_13(memoryStream2.Length);
}
else
{
if (memoryStream2.Length != 272L)
{
throw new Exception();
}
class889_2.vmethod_13(-272L);
}
memoryStream4.Write(memoryStream2.GetBuffer(), 0, (int)memoryStream2.Length);
uint num4 = Class746.class746_0.K * 3U;
uint length = (uint)class889_2.Stream.Length;
uint num5 = (uint)((ulong)(uint)((int)length + 8 - 1) & 18446744073709551608UL);
uint paddingSize1 = num5 - length;
this.method_25((Stream)memoryStream4, paddingSize1);
uint num6 = num4 / num5;
for (int index = 1; (long)index < (long)num6; ++index)
{
memoryStream4.Write(memoryStream4.GetBuffer(), 0, (int)num5);
}
uint paddingSize2 = num4 - (uint)memoryStream4.Length;
this.method_25((Stream)memoryStream4, paddingSize2);
byte[] buffer = new byte[1024];
fixed(byte *source = memoryStream4.GetBuffer())
fixed(byte *destination = buffer)
{
this.method_28(destination, source, (int)num4, Class746.class746_0);
this.method_24(destination + 765, 259U);
}
MemoryStream memoryStream5 = new MemoryStream(buffer, true);
memoryStream5.Position = memoryStream5.Length - 40L;
class888.Write((Stream)memoryStream5);
if (memoryStream5.Length != 1024L)
{
throw new Exception();
}
this.stream_0.Write(buffer, 0, buffer.Length);
this.stream_0.Position = 128L;
this.stream_0.Write(buffer, 0, buffer.Length);
}