niko
118 lines
2.7 KiB
C#
118 lines
2.7 KiB
C#
using System;
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using System.IO;
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using Hjg.Pngcs.Zlib;
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namespace Hjg.Pngcs.Chunks
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{
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// Token: 0x02000005 RID: 5
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public class ChunkRaw
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{
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// Token: 0x06000025 RID: 37 RVA: 0x000025C0 File Offset: 0x000007C0
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internal ChunkRaw(int length, byte[] idbytes, bool alloc)
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{
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this.IdBytes = new byte[4];
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this.Data = null;
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this.crcval = 0;
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this.Length = length;
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Array.Copy(idbytes, 0, this.IdBytes, 0, 4);
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if (alloc)
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{
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this.AllocData();
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}
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}
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// Token: 0x06000026 RID: 38 RVA: 0x0000260C File Offset: 0x0000080C
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private int ComputeCrc()
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{
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CRC32 crc = PngHelperInternal.GetCRC();
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crc.Reset();
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crc.Update(this.IdBytes, 0, 4);
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if (this.Length > 0)
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{
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crc.Update(this.Data, 0, this.Length);
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}
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return (int)crc.GetValue();
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}
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// Token: 0x06000027 RID: 39 RVA: 0x00002658 File Offset: 0x00000858
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internal void WriteChunk(Stream os)
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{
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if (this.IdBytes.Length != 4)
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{
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throw new PngjOutputException("bad chunkid [" + ChunkHelper.ToString(this.IdBytes) + "]");
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}
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this.crcval = this.ComputeCrc();
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PngHelperInternal.WriteInt4(os, this.Length);
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PngHelperInternal.WriteBytes(os, this.IdBytes);
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if (this.Length > 0)
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{
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PngHelperInternal.WriteBytes(os, this.Data, 0, this.Length);
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}
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PngHelperInternal.WriteInt4(os, this.crcval);
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}
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// Token: 0x06000028 RID: 40 RVA: 0x000026DC File Offset: 0x000008DC
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internal int ReadChunkData(Stream stream, bool checkCrc)
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{
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PngHelperInternal.ReadBytes(stream, this.Data, 0, this.Length);
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this.crcval = PngHelperInternal.ReadInt4(stream);
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if (checkCrc)
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{
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int num = this.ComputeCrc();
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if (num != this.crcval)
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{
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throw new PngjBadCrcException(string.Concat(new object[]
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{
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"crc invalid for chunk ",
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this.ToString(),
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" calc=",
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num,
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" read=",
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this.crcval
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}));
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}
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}
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return this.Length + 4;
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}
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// Token: 0x06000029 RID: 41 RVA: 0x0000276E File Offset: 0x0000096E
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internal MemoryStream GetAsByteStream()
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{
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return new MemoryStream(this.Data);
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}
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// Token: 0x0600002A RID: 42 RVA: 0x0000277B File Offset: 0x0000097B
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private void AllocData()
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{
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if (this.Data == null || this.Data.Length < this.Length)
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{
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this.Data = new byte[this.Length];
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}
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}
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// Token: 0x0600002B RID: 43 RVA: 0x000027A8 File Offset: 0x000009A8
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public override string ToString()
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{
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return string.Concat(new object[]
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{
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"chunkid=",
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ChunkHelper.ToString(this.IdBytes),
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" len=",
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this.Length
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});
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}
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// Token: 0x04000025 RID: 37
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public readonly int Length;
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// Token: 0x04000026 RID: 38
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public readonly byte[] IdBytes;
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// Token: 0x04000027 RID: 39
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public byte[] Data;
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// Token: 0x04000028 RID: 40
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private int crcval;
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}
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}
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