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niko
2026-06-04 11:42:34 +02:00
parent f39ba70a9f
commit e720b98cd1
7488 changed files with 2493818 additions and 0 deletions
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ICSharpCode.SharpZipLib/GZip/GZipInputStream.cs
+231
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using System;
using System.IO;
using ICSharpCode.SharpZipLib.Checksums;
using ICSharpCode.SharpZipLib.Zip.Compression;
using ICSharpCode.SharpZipLib.Zip.Compression.Streams;
namespace ICSharpCode.SharpZipLib.GZip
{
// Token: 0x0200002A RID: 42
public class GZipInputStream : InflaterInputStream
{
// Token: 0x0600012B RID: 299 RVA: 0x00008661 File Offset: 0x00007661
public GZipInputStream(Stream baseInputStream)
: this(baseInputStream, 4096)
{
}
// Token: 0x0600012C RID: 300 RVA: 0x0000866F File Offset: 0x0000766F
public GZipInputStream(Stream baseInputStream, int size)
: base(baseInputStream, new Inflater(true), size)
{
}
// Token: 0x0600012D RID: 301 RVA: 0x00008680 File Offset: 0x00007680
public override int Read(byte[] buffer, int offset, int count)
{
while (this.readGZIPHeader || this.ReadHeader())
{
int num = base.Read(buffer, offset, count);
if (num > 0)
{
this.crc.Update(buffer, offset, num);
}
if (this.inf.IsFinished)
{
this.ReadFooter();
}
if (num > 0)
{
return num;
}
}
return 0;
}
// Token: 0x0600012E RID: 302 RVA: 0x000086D4 File Offset: 0x000076D4
private bool ReadHeader()
{
this.crc = new Crc32();
if (this.inputBuffer.Available <= 0)
{
this.inputBuffer.Fill();
if (this.inputBuffer.Available <= 0)
{
return false;
}
}
Crc32 crc = new Crc32();
int num = this.inputBuffer.ReadLeByte();
if (num < 0)
{
throw new EndOfStreamException("EOS reading GZIP header");
}
crc.Update(num);
if (num != 31)
{
throw new GZipException("Error GZIP header, first magic byte doesn't match");
}
num = this.inputBuffer.ReadLeByte();
if (num < 0)
{
throw new EndOfStreamException("EOS reading GZIP header");
}
if (num != 139)
{
throw new GZipException("Error GZIP header, second magic byte doesn't match");
}
crc.Update(num);
int num2 = this.inputBuffer.ReadLeByte();
if (num2 < 0)
{
throw new EndOfStreamException("EOS reading GZIP header");
}
if (num2 != 8)
{
throw new GZipException("Error GZIP header, data not in deflate format");
}
crc.Update(num2);
int num3 = this.inputBuffer.ReadLeByte();
if (num3 < 0)
{
throw new EndOfStreamException("EOS reading GZIP header");
}
crc.Update(num3);
if ((num3 & 224) != 0)
{
throw new GZipException("Reserved flag bits in GZIP header != 0");
}
for (int i = 0; i < 6; i++)
{
int num4 = this.inputBuffer.ReadLeByte();
if (num4 < 0)
{
throw new EndOfStreamException("EOS reading GZIP header");
}
crc.Update(num4);
}
if ((num3 & 4) != 0)
{
for (int j = 0; j < 2; j++)
{
int num5 = this.inputBuffer.ReadLeByte();
if (num5 < 0)
{
throw new EndOfStreamException("EOS reading GZIP header");
}
crc.Update(num5);
}
if (this.inputBuffer.ReadLeByte() < 0 || this.inputBuffer.ReadLeByte() < 0)
{
throw new EndOfStreamException("EOS reading GZIP header");
}
int num6 = this.inputBuffer.ReadLeByte();
int num7 = this.inputBuffer.ReadLeByte();
if (num6 < 0 || num7 < 0)
{
throw new EndOfStreamException("EOS reading GZIP header");
}
crc.Update(num6);
crc.Update(num7);
int num8 = (num6 << 8) | num7;
for (int k = 0; k < num8; k++)
{
int num9 = this.inputBuffer.ReadLeByte();
if (num9 < 0)
{
throw new EndOfStreamException("EOS reading GZIP header");
}
crc.Update(num9);
}
}
if ((num3 & 8) != 0)
{
int num10;
while ((num10 = this.inputBuffer.ReadLeByte()) > 0)
{
crc.Update(num10);
}
if (num10 < 0)
{
throw new EndOfStreamException("EOS reading GZIP header");
}
crc.Update(num10);
}
if ((num3 & 16) != 0)
{
int num11;
while ((num11 = this.inputBuffer.ReadLeByte()) > 0)
{
crc.Update(num11);
}
if (num11 < 0)
{
throw new EndOfStreamException("EOS reading GZIP header");
}
crc.Update(num11);
}
if ((num3 & 2) != 0)
{
int num12 = this.inputBuffer.ReadLeByte();
if (num12 < 0)
{
throw new EndOfStreamException("EOS reading GZIP header");
}
int num13 = this.inputBuffer.ReadLeByte();
if (num13 < 0)
{
throw new EndOfStreamException("EOS reading GZIP header");
}
num12 = (num12 << 8) | num13;
if (num12 != ((int)crc.Value & 65535))
{
throw new GZipException("Header CRC value mismatch");
}
}
this.readGZIPHeader = true;
return true;
}
// Token: 0x0600012F RID: 303 RVA: 0x000089E0 File Offset: 0x000079E0
private void ReadFooter()
{
byte[] array = new byte[8];
long num = this.inf.TotalOut & (long)((ulong)(-1));
this.inputBuffer.Available += this.inf.RemainingInput;
this.inf.Reset();
int num2;
for (int i = 8; i > 0; i -= num2)
{
num2 = this.inputBuffer.ReadClearTextBuffer(array, 8 - i, i);
if (num2 <= 0)
{
throw new EndOfStreamException("EOS reading GZIP footer");
}
}
int num3 = (int)(array[0] & byte.MaxValue) | ((int)(array[1] & byte.MaxValue) << 8) | ((int)(array[2] & byte.MaxValue) << 16) | ((int)array[3] << 24);
if (num3 != (int)this.crc.Value)
{
throw new GZipException(string.Concat(new object[]
{
"GZIP crc sum mismatch, theirs \"",
num3,
"\" and ours \"",
(int)this.crc.Value
}));
}
uint num4 = (uint)((int)(array[4] & byte.MaxValue) | ((int)(array[5] & byte.MaxValue) << 8) | ((int)(array[6] & byte.MaxValue) << 16) | ((int)array[7] << 24));
if (num != (long)((ulong)num4))
{
throw new GZipException("Number of bytes mismatch in footer");
}
this.readGZIPHeader = false;
}
// Token: 0x040000AB RID: 171
protected Crc32 crc;
// Token: 0x040000AC RID: 172
private bool readGZIPHeader;
}
}