private void method_18()
{
this.method_27();
Class615 page = new Class615(1097010747);
this.method_19(page);
int pageSize = this.list_1.Count * 8;
page.StreamOffset = this.stream_0.Position;
int num = pageSize + Class998.smethod_0(pageSize);
page.Length = (long)num;
MemoryStream sectionStream = new MemoryStream();
Class889 class889 = Class889.Create((Stream)sectionStream, this.dxfVersion_0, this.encoding_0);
foreach (Class614 class614 in this.list_1)
{
if (class614 != null)
{
class889.vmethod_9(class614.PageNumber);
class889.vmethod_9((int)class614.Length);
}
}
this.method_21(page, sectionStream);
Class614 class614_1 = this.list_1[this.list_1.Count - 1];
this.class564_0.LastPageId = class614_1.PageNumber;
this.class564_0.LastPageEndOffset = (ulong)(class614_1.StreamOffset + (long)num - 256L);
this.class564_0.GapCount = 0U;
this.class564_0.PageCount = (uint)(this.list_1.Count - 1);
this.class564_0.PagesMapOffset = (ulong)page.StreamOffset;
}
private void method_17()
{
MemoryStream sectionStream = new MemoryStream();
Class889 class889 = Class889.Create((Stream)sectionStream, this.dxfVersion_0, this.encoding_0);
class889.vmethod_9(this.list_0.Count);
class889.vmethod_9(2);
class889.vmethod_9(29696);
class889.vmethod_9(0);
class889.vmethod_9(this.list_0.Count);
foreach (Class617 class617 in this.list_0)
{
class889.vmethod_15(class617.SectionSize);
class889.vmethod_9(class617.PageCount);
class889.vmethod_9(class617.MaxDecompressedPageSize);
class889.vmethod_9(1);
class889.vmethod_9(class617.Compressed);
class889.vmethod_9(class617.SectionId);
class889.vmethod_9(class617.Encrypted);
byte[] buffer = new byte[64];
if (!string.IsNullOrEmpty(class617.Name))
{
byte[] bytes = Encodings.Ascii.GetBytes(class617.Name);
int num = Math.Min(bytes.Length, buffer.Length);
for (int index = 0; index < num; ++index)
{
buffer[index] = bytes[index];
}
}
sectionStream.Write(buffer, 0, buffer.Length);
foreach (Class616 page in class617.Pages)
{
if (page.PageNumber > 0)
{
class889.vmethod_9(page.PageNumber);
class889.vmethod_9(page.CompressedSize);
class889.vmethod_15(page.StartOffset);
}
}
}
Class615 page1 = this.method_20(1097007163, sectionStream);
int count = Class998.smethod_0((int)(this.stream_0.Position - page1.StreamOffset));
this.stream_0.Write(Class998.byte_0, 0, count);
page1.Length = this.stream_0.Position - page1.StreamOffset;
this.method_19(page1);
}
private void method_21(Class615 page, MemoryStream sectionStream)
{
page.DecompressedSize = (int)sectionStream.Length;
Class565 class565 = new Class565();
MemoryStream memoryStream1 = new MemoryStream();
class565.method_1(sectionStream.GetBuffer(), 0, (int)sectionStream.Length, (Stream)memoryStream1);
page.CompressedSize = (int)memoryStream1.Length;
MemoryStream memoryStream2 = new MemoryStream();
this.method_22(page, (Stream)memoryStream2);
page.Checksum = Class998.smethod_1(0U, memoryStream2.GetBuffer(), 0, (int)memoryStream2.Length);
page.Checksum = Class998.smethod_1(page.Checksum, memoryStream1.GetBuffer(), 0, (int)memoryStream1.Length);
this.method_22(page, this.stream_0);
this.stream_0.Write(memoryStream1.GetBuffer(), 0, (int)memoryStream1.Length);
this.method_22(new Class615(page.SectionPageType), this.stream_0);
}
private void method_24(
Class617 section,
int pageType,
int maxPageSize,
byte[] buffer,
ulong position,
int uncompressedLength,
bool compress)
{
MemoryStream memoryStream1 = new MemoryStream();
if (compress)
{
MemoryStream memoryStream2 = new MemoryStream(maxPageSize);
memoryStream2.Write(buffer, (int)position, uncompressedLength);
int num = maxPageSize - uncompressedLength;
for (int index = 0; index < num; ++index)
{
memoryStream2.WriteByte((byte)0);
}
new Class565().method_1(memoryStream2.GetBuffer(), 0, maxPageSize, (Stream)memoryStream1);
}
else
{
memoryStream1.Write(buffer, (int)position, uncompressedLength);
int num = maxPageSize - uncompressedLength;
for (int index = 0; index < num; ++index)
{
memoryStream1.WriteByte((byte)0);
}
}
this.method_27();
long position1 = this.stream_0.Position;
Class616 page = new Class616();
page.PageNumber = this.list_1.Count + 1;
page.StartOffset = position;
page.StreamOffset = position1;
page.DataChecksum = Class998.smethod_1(0U, memoryStream1.GetBuffer(), 0, (int)memoryStream1.Length);
uint dataChecksum = page.DataChecksum;
int count = Class998.smethod_0((int)memoryStream1.Length);
page.CompressedSize = (int)memoryStream1.Length;
page.DecompressedSize = uncompressedLength;
page.PageSize = page.CompressedSize + 32 + count;
page.HeaderChecksum = 0U;
MemoryStream memoryStream3 = new MemoryStream(32);
this.method_25((Stream)memoryStream3, section, page, pageType);
page.HeaderChecksum = Class998.smethod_1(dataChecksum, memoryStream3.GetBuffer(), 0, (int)memoryStream3.Length);
memoryStream3.SetLength(0L);
memoryStream3.Position = 0L;
this.method_25((Stream)memoryStream3, section, page, pageType);
this.method_26(memoryStream3.GetBuffer(), 0, (int)memoryStream3.Length);
this.stream_0.Write(memoryStream3.GetBuffer(), 0, (int)memoryStream3.Length);
this.stream_0.Write(memoryStream1.GetBuffer(), 0, (int)memoryStream1.Length);
if (compress)
{
this.stream_0.Write(Class998.byte_0, 0, count);
}
else if (count != 0)
{
throw new Exception();
}
if (page.PageNumber > 0)
{
++section.PageCount;
}
page.Length = this.stream_0.Position - position1;
section.Pages.Add(page);
this.list_1.Add((Class614)page);
}
