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UnityFileReader.cs

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using System;

using System.IO;

using System.Text;

using Force.Crc32;

namespace UnityDataTools.FileSystem;

// This class can be used to read typed data from a UnityFile. Is uses a buffer for better performance.

public class UnityFileReader : IDisposable

{

UnityFile m_File;

byte[] m_Buffer;

long m_BufferStartInFile;

long m_BufferEndInFile;

public long Length { get; }

public UnityFileReader(string path, int bufferSize)

{

m_Buffer = new byte[bufferSize];

m_BufferStartInFile = 0;

m_BufferEndInFile = 0;

m_File = UnityFileSystem.OpenFile(path);

Length = m_File.GetSize();

}

int GetBufferOffset(long fileOffset, int count)

{

// Should we update the buffer?

if (fileOffset < m_BufferStartInFile || fileOffset + count > m_BufferEndInFile)

{

if (count > m_Buffer.Length)

throw new IOException("Requested size is larger than cache size");

m_BufferStartInFile = m_File.Seek(fileOffset);

if (m_BufferStartInFile != fileOffset)

throw new IOException("Invalid file offset");

m_BufferEndInFile = m_File.Read(m_Buffer.Length, m_Buffer);

m_BufferEndInFile += m_BufferStartInFile;

}

return (int)(fileOffset - m_BufferStartInFile);

}

public void ReadArray(long fileOffset, int size, Array dest)

{

var offset = GetBufferOffset(fileOffset, size);

Buffer.BlockCopy(m_Buffer, offset, dest, 0, size);

}

public string ReadString(long fileOffset, int size)

{

var offset = GetBufferOffset(fileOffset, size);

return Encoding.Default.GetString(m_Buffer, offset, size);

}

public float ReadFloat(long fileOffset)

{

var offset = GetBufferOffset(fileOffset, 4);

return BitConverter.ToSingle(m_Buffer, offset);

}

public double ReadDouble(long fileOffset)

{

var offset = GetBufferOffset(fileOffset, 8);

return BitConverter.ToDouble(m_Buffer, offset);

}

public long ReadInt64(long fileOffset)

{

var offset = GetBufferOffset(fileOffset, 8);

return BitConverter.ToInt64(m_Buffer, offset);

}

public ulong ReadUInt64(long fileOffset)

{

var offset = GetBufferOffset(fileOffset, 8);

return BitConverter.ToUInt64(m_Buffer, offset);

}

public int ReadInt32(long fileOffset)

{

var offset = GetBufferOffset(fileOffset, 4);

return BitConverter.ToInt32(m_Buffer, offset);

}

public uint ReadUInt32(long fileOffset)

{

var offset = GetBufferOffset(fileOffset, 4);

return BitConverter.ToUInt32(m_Buffer, offset);

}

public short ReadInt16(long fileOffset)

{

var offset = GetBufferOffset(fileOffset, 2);

return BitConverter.ToInt16(m_Buffer, offset);

}

public ushort ReadUInt16(long fileOffset)

{

var offset = GetBufferOffset(fileOffset, 2);

return BitConverter.ToUInt16(m_Buffer, offset);

}

public sbyte ReadInt8(long fileOffset)

{

var offset = GetBufferOffset(fileOffset, 1);

return (sbyte)m_Buffer[offset];

}

public byte ReadUInt8(long fileOffset)

{

var offset = GetBufferOffset(fileOffset, 1);

return m_Buffer[offset];

}

public uint ComputeCRC(long fileOffset, int size, uint crc32 = 0)

{

var readSize = size > m_Buffer.Length ? m_Buffer.Length : size;

var readBytes = 0;

while (readBytes < size)

{

var offset = GetBufferOffset(fileOffset, readSize);

crc32 = Crc32Algorithm.Append(crc32, m_Buffer, offset, readSize);

readBytes += readSize;

}

return crc32;

}

public void Dispose()

{

m_File.Dispose();

}

}