GARbro-mirror/ArcFormats/Scoop/ImageSCP.cs

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2018-12-30 02:24:34 +08:00
//! \file ImageSCP.cs
//! \date 2018 Dec 27
//! \brief Scoop compressed bitmap.
//
// 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;
using System.ComponentModel.Composition;
using System.IO;
using GameRes.Utility;
namespace GameRes.Formats.Scoop
{
[Export(typeof(ImageFormat))]
public class ScpFormat : ImageFormat
{
public override string Tag { get { return "SCP"; } }
public override string Description { get { return "Scoop compressed bitmap"; } }
public override uint Signature { get { return 0x7A504353; } } // 'SCPz'
public ScpFormat ()
{
Extensions = new string[] { };
}
const uint DefaultHeaderKey = 0x65641538;
public override ImageMetaData ReadMetaData (IBinaryStream file)
{
file.Position = 4;
uint length = file.ReadUInt32() ^ DefaultHeaderKey;
if (length <= 0)
return null;
var header = new byte[0x36];
Unpack (file, header);
if (!header.AsciiEqual ("BM"))
return null;
using (var bmp = new BinMemoryStream (header))
{
var info = Bmp.ReadMetaData (bmp) as BmpMetaData;
if (info != null)
info.ImageLength = length;
return info;
}
}
public override ImageData Read (IBinaryStream file, ImageMetaData info)
{
var meta = (BmpMetaData)info;
var data = new byte[meta.ImageLength];
file.Position = 8;
Unpack (file, data);
using (var bmp = new BinMemoryStream (data))
return Bmp.Read (bmp, info);
}
public override void Write (Stream file, ImageData image)
{
throw new System.NotImplementedException ("ScpFormat.Write not implemented");
}
internal void Unpack (IBinaryStream input, byte[] output)
{
uint bits = 0;
int dst = 0;
byte v = 0x7F;
byte x = 0;
while (dst < output.Length)
{
uint ctl = bits >> 31;
bits <<= 1;
if (0 == bits)
{
bits = input.ReadUInt32();
continue;
}
if (0 == ctl)
{
x = v;
v ^= input.ReadUInt8();
output[dst++] = v;
}
else
{
ushort z = input.ReadUInt16();
z += (ushort)bits;
int count = (z >> 12) & 0xF;
if (0 == count)
{
count = (x + input.ReadUInt8()) & 0xFF;
if (0 == count)
break;
count += 15;
}
int offset = ~(z & 0xFFF);
count = Math.Min (count + 2, output.Length - dst);
Binary.CopyOverlapped (output, dst + offset, dst, count);
dst += count;
}
}
}
}
}