GARbro-mirror/Legacy/ProjectMyu/ImageGAM.cs

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2018-10-25 21:01:29 +08:00
//! \file ImageGAM.cs
//! \date 2018 Oct 23
//! \brief Project-μ image format.
//
// Copyright (C) 2018 by morkt
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to
// deal in the Software without restriction, including without limitation the
// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
// sell copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
// IN THE SOFTWARE.
//
using System.Collections.Generic;
using System.ComponentModel.Composition;
using System.IO;
using GameRes.Compression;
// [031219][Project-μ] Gin no Hebi Kuro no Tsuki
2018-12-30 18:46:08 +08:00
// [040528][Lakshmi] Mabuta Tojireba Soko ni...
2018-10-25 21:01:29 +08:00
namespace GameRes.Formats.ProjectMu
{
[Export(typeof(ImageFormat))]
public class GamFormat : ImageFormat
{
public override string Tag { get { return "GAM"; } }
public override string Description { get { return "Project-μ image format"; } }
public override uint Signature { get { return 0x4D4147; } } // 'GAM'
public override ImageMetaData ReadMetaData (IBinaryStream file)
{
using (var input = OpenGamStream (file))
return Bmp.ReadMetaData (input);
}
public override ImageData Read (IBinaryStream file, ImageMetaData info)
{
using (var input = OpenGamStream (file))
return Bmp.Read (input, info);
}
IBinaryStream OpenGamStream (IBinaryStream input)
{
input.Position = 8;
var unpacked = new PackedStream<GamDecompressor> (input.AsStream, true);
return new BinaryStream (unpacked, input.Name);
}
public override void Write (Stream file, ImageData image)
{
throw new System.NotImplementedException ("GamFormat.Write not implemented");
}
}
internal class GamDecompressor : Decompressor
{
Stream m_input;
public override void Initialize (Stream input)
{
m_input = input;
}
protected override IEnumerator<int> Unpack ()
{
var frame = new byte[0x100];
int frame_pos = 0;
int bits = 1;
for (;;)
{
if (1 == bits)
{
int b = m_input.ReadByte();
if (-1 == b)
yield break;
bits = b;
b = m_input.ReadByte();
if (-1 == b)
yield break;
bits |= b << 8 | 0x10000;
}
if (0 == (bits & 1))
{
int b = m_input.ReadByte();
if (-1 == b)
yield break;
frame[frame_pos++ & 0xFF] = (byte)b;
m_buffer[m_pos++] = (byte)b;
if (0 == --m_length)
yield return m_pos;
}
else
{
int offset = m_input.ReadByte();
if (-1 == offset)
yield break;
int count = m_input.ReadByte();
if (-1 == count)
yield break;
while (count --> 0)
{
byte v = frame[(frame_pos - offset) & 0xFF];
frame[frame_pos++ & 0xFF] = v;
m_buffer[m_pos++] = v;
if (0 == --m_length)
yield return m_pos;
}
}
bits >>= 1;
}
}
}
}