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C#: added built-in check for arm9.bin in LZ-Overlay decompression, as it has some extra bytes that should be ignored when decompressing. Only the file-based methods can handle that of course. Perhaps the extra bytes should also be copied to the output file however, which is currently not the case.

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This commit is contained in:
barubary 2011-04-21 14:16:59 +00:00
parent 167300d5b8
commit 69cd6ee199
2 changed files with 37 additions and 3 deletions
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4
CSharp/DSDecmp/Formats/CompressionFormat.cs
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@ -19,7 +19,7 @@ namespace DSDecmp.Formats
/// <param name="file">The name of the file to check.</param>
/// <returns>False if the file can certainly not be decompressed using this decompressor.
/// True if the file may potentially be decompressed using this decompressor.</returns>
public bool Supports(string file)
public virtual bool Supports(string file)
{
// open the file, and delegate to the decompressor-specific code.
using (FileStream fstr = new FileStream(file, FileMode.Open))
@ -49,7 +49,7 @@ namespace DSDecmp.Formats
/// </summary>
/// <param name="infile">The file to decompress.</param>
/// <param name="outfile">The target location of the decompressed file.</param>
public void Decompress(string infile, string outfile)
public virtual void Decompress(string infile, string outfile)
{
// make sure the output directory exists
string outDirectory = Path.GetDirectoryName(outfile);

36
CSharp/DSDecmp/Formats/LZOvl.cs
View File

@ -9,10 +9,24 @@ namespace DSDecmp.Formats
/// The LZ-Overlay compression format. Compresses part of the file from end to start.
/// Is used for the 'overlay' files in NDS games, as well as arm9.bin.
/// Note that the last 12 bytes should not be included in the 'inLength' argument when
/// decompressing arm9.bin.
/// decompressing arm9.bin. This is done automatically if a file is given instead of a stream.
/// </summary>
public class LZOvl : CompressionFormat
{
#region Method: Supports(string file)
public override bool Supports(string file)
{
using (FileStream fstr = File.OpenRead(file))
{
long fLength = fstr.Length;
// arm9.bin is special in the sense that the last 12 bytes should/can be ignored.
if (Path.GetFileName(file) == "arm9.bin")
fLength -= 0xC;
return this.Supports(fstr, fLength);
}
}
#endregion
#region Method: Supports(Stream, long)
public override bool Supports(System.IO.Stream stream, long inLength)
{
@ -56,6 +70,26 @@ namespace DSDecmp.Formats
}
#endregion
#region Method: Decompress(string, string)
public override void Decompress(string infile, string outfile)
{
// make sure the output directory exists
string outDirectory = Path.GetDirectoryName(outfile);
if (!Directory.Exists(outDirectory))
Directory.CreateDirectory(outDirectory);
// open the two given files, and delegate to the format-specific code.
using (FileStream inStream = new FileStream(infile, FileMode.Open),
outStream = new FileStream(outfile, FileMode.Create))
{
long fLength = inStream.Length;
// arm9.bin needs special attention
if (Path.GetFileName(infile) == "arm9.bin")
fLength -= 0xC;
this.Decompress(inStream, fLength, outStream);
}
}
#endregion
public override void Decompress(System.IO.Stream instream, long inLength, System.IO.Stream outstream)
{
#region Format description