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(StreamRange): new wrapper around IO.Stream.

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(LzssReader): allow compressed format customization.
This commit is contained in:
morkt 2015-06-12 01:47:00 +04:00
parent fc27ece34d
commit 29bd97fca9
1 changed files with 114 additions and 6 deletions
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120
ArcFormats/ArcCommon.cs
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@ -187,26 +187,134 @@ namespace GameRes.Formats
}
}
/// <summary>
/// Represents a region within existing stream.
/// Underlying stream should allow seeking (CanSeek == true).
/// </summary>
public class StreamRegion : Stream
{
private Stream m_stream;
private long m_begin;
private long m_end;
public StreamRegion (Stream main, long offset, long length)
{
m_stream = main;
m_begin = offset;
m_end = Math.Min (offset + length, m_stream.Length);
m_stream.Position = m_begin;
}
public StreamRegion (Stream main, long offset) : this (main, offset, main.Length-offset)
{
}
public override bool CanRead { get { return m_stream.CanRead; } }
public override bool CanSeek { get { return true; } }
public override bool CanWrite { get { return false; } }
public override long Length { get { return m_end - m_begin; } }
public override long Position
{
get { return m_stream.Position - m_begin; }
set { m_stream.Position = Math.Max (m_begin + value, m_begin); }
}
public override void Flush()
{
m_stream.Flush();
}
public override long Seek (long offset, SeekOrigin origin)
{
if (SeekOrigin.Begin == origin)
offset += m_begin;
else if (SeekOrigin.Current == origin)
offset += m_stream.Position;
else
offset += m_end;
offset = Math.Max (offset, m_begin);
m_stream.Position = offset;
return offset - m_begin;
}
public override int Read (byte[] buffer, int offset, int count)
{
int read = 0;
long available = m_end - m_stream.Position;
if (available > 0)
{
read = m_stream.Read (buffer, offset, (int)Math.Min (count, available));
}
return read;
}
public override int ReadByte ()
{
if (m_stream.Position < m_end)
return m_stream.ReadByte();
else
return -1;
}
public override void SetLength (long length)
{
throw new NotSupportedException ("StreamRegion.SetLength method is not supported");
}
public override void Write (byte[] buffer, int offset, int count)
{
throw new NotSupportedException ("StreamRegion.Write method is not supported");
}
public override void WriteByte (byte value)
{
throw new NotSupportedException ("StreamRegion.WriteByte method is not supported");
}
bool m_disposed = false;
protected override void Dispose (bool disposing)
{
if (!m_disposed)
{
m_stream.Dispose();
m_disposed = true;
base.Dispose (disposing);
}
}
}
public class LzssReader : IDisposable
{
BinaryReader m_input;
byte[] m_output;
int m_size;
public byte[] Data { get { return m_output; } }
public BinaryReader Input { get { return m_input; } }
public byte[] Data { get { return m_output; } }
public int FrameSize { get; set; }
public byte FrameFill { get; set; }
public int FrameInitPos { get; set; }
public LzssReader (Stream input, int input_length, int output_length)
{
m_input = new BinaryReader (input, Encoding.ASCII, true);
m_output = new byte[output_length];
m_size = input_length;
FrameSize = 0x1000;
FrameFill = 0;
FrameInitPos = 0xfee;
}
public void Unpack ()
{
int dst = 0;
var frame = new byte[0x1000];
int frame_pos = 0xfee;
var frame = new byte[FrameSize];
if (FrameFill != 0)
for (int i = 0; i < frame.Length; ++i)
frame[i] = FrameFill;
int frame_pos = FrameInitPos;
int frame_mask = FrameSize-1;
int remaining = (int)m_size;
while (remaining > 0)
{
@ -221,7 +329,7 @@ namespace GameRes.Formats
byte b = m_input.ReadByte();
--remaining;
frame[frame_pos++] = b;
frame_pos &= 0xfff;
frame_pos &= frame_mask;
m_output[dst++] = b;
}
else
@ -237,9 +345,9 @@ namespace GameRes.Formats
if (dst >= m_output.Length)
break;
byte v = frame[offset++];
offset &= 0xfff;
offset &= frame_mask;
frame[frame_pos++] = v;
frame_pos &= 0xfff;
frame_pos &= frame_mask;
m_output[dst++] = v;
}
}