92 lines
3.5 KiB
C#
92 lines
3.5 KiB
C#
using System;
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using System.IO;
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namespace ROMVault2.SupportedFiles.SevenZip.Structure
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{
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public class PackedStreamInfo
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{
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public ulong PackedSize;
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public ulong? Crc;
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public ulong StreamPosition;
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public static void Read(BinaryReader br, out ulong packPosition, out PackedStreamInfo[] packedStreams)
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{
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Util.log("Begin : ReadPackInfo", 1);
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packPosition = br.ReadEncodedUInt64();
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Util.log("PackPosition = " + packPosition);
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ulong numPackStreams = br.ReadEncodedUInt64();
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Util.log("NumPackStreams = " + numPackStreams);
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packedStreams = new PackedStreamInfo[numPackStreams];
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for (ulong i = 0; i < numPackStreams; i++)
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packedStreams[i] = new PackedStreamInfo();
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ulong streamPosition = 0;
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for (; ; )
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{
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HeaderProperty hp = (HeaderProperty)br.ReadByte();
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Util.log("HeaderProperty = " + hp);
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switch (hp)
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{
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case HeaderProperty.kSize:
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for (ulong i = 0; i < numPackStreams; i++)
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{
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packedStreams[i].StreamPosition = streamPosition;
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Util.log("PackdStream[" + i + "].StreamPosition = " + packedStreams[i].StreamPosition);
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packedStreams[i].PackedSize = br.ReadEncodedUInt64();
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Util.log("PackdStream[" + i + "].PackedSize = " + packedStreams[i].PackedSize);
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streamPosition += packedStreams[i].PackedSize;
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}
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continue;
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case HeaderProperty.kCRC:
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for (ulong i = 0; i < numPackStreams; i++)
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{
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packedStreams[i].Crc = br.ReadEncodedUInt64();
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Util.log("PackdStream[" + i + "].CRC = " + ((ulong)packedStreams[i].Crc).ToString("X"));
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}
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continue;
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case HeaderProperty.kEnd:
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Util.log("End : ReadPackInfo", -1);
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return;
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default:
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throw new Exception(hp.ToString());
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}
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}
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}
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public static void Write(BinaryWriter bw,ulong packPosition, PackedStreamInfo[] packedStreams)
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{
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ulong numPackStreams =(ulong) packedStreams.Length;
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bw.Write((byte)HeaderProperty.kPackInfo);
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bw.WriteEncodedUInt64(packPosition);
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bw.WriteEncodedUInt64(numPackStreams);
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bw.Write((byte)HeaderProperty.kSize);
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ulong streamPosition = 0;
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for (ulong i = 0; i < numPackStreams; i++)
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{
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packedStreams[i].StreamPosition = streamPosition;
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bw.WriteEncodedUInt64(packedStreams[i].PackedSize);
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streamPosition += packedStreams[i].PackedSize;
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}
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// Only checking the first CRC assuming all the reset will be the same
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if (packedStreams[0].Crc != null)
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{
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bw.Write((byte) HeaderProperty.kCRC);
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for (ulong i = 0; i < numPackStreams; i++)
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bw.WriteEncodedUInt64(packedStreams[i].Crc??0);
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}
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bw.Write((byte)HeaderProperty.kEnd);
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}
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}
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}
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