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Simplify parent CHD class

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This commit is contained in:
Matt Nadareski
2024-10-20 00:06:40 -04:00
parent ab93ba406c
commit c57148de24
1 changed files with 17 additions and 30 deletions
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47
SabreTools.FileTypes/CHD/CHDFile.cs
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@@ -30,25 +30,31 @@ namespace SabreTools.FileTypes.CHD
/// <param name="filename">Filename respresenting the CHD file</param>
public static CHDFile? Create(string filename)
{
using FileStream fs = File.OpenRead(filename);
using var fs = File.OpenRead(filename);
return Create(fs);
}
/// <summary>
/// Create a new CHDFile from an input stream
/// </summary>
/// <param name="chdstream">Stream representing the CHD file</param>
public static CHDFile? Create(Stream chdstream)
/// <param name="stream">Stream representing the CHD file</param>
public static CHDFile? Create(Stream stream)
{
try
{
// Validate that this is actually a valid CHD
uint version = ValidateHeader(chdstream);
if (version == 0)
return null;
// Get the detected CHD version
uint version = GetVersion(stream);
// Read and return the current CHD
return ReadAsVersion(chdstream, version);
return version switch
{
1 => CHDFileV1.Deserialize(stream),
2 => CHDFileV2.Deserialize(stream),
3 => CHDFileV3.Deserialize(stream),
4 => CHDFileV4.Deserialize(stream),
5 => CHDFileV5.Deserialize(stream),
_ => null,
};
}
catch
{
@@ -67,13 +73,13 @@ namespace SabreTools.FileTypes.CHD
#endregion
#region Header Parsing
#region Helpers
/// <summary>
/// Validate the header values
/// Get the matching CHD version, if possible
/// </summary>
/// <returns>Matching version, 0 if none</returns>
private static uint ValidateHeader(Stream stream)
private static uint GetVersion(Stream stream)
{
// Read the header values
byte[] tagBytes = stream.ReadBytes(8);
@@ -100,25 +106,6 @@ namespace SabreTools.FileTypes.CHD
};
}
/// <summary>
/// Read a stream as a particular CHD version
/// </summary>
/// <param name="stream">CHD file as a stream</param>
/// <param name="version">CHD version to parse</param>
/// <returns>Populated CHD file, null on failure</returns>
private static CHDFile? ReadAsVersion(Stream stream, uint version)
{
return version switch
{
1 => CHDFileV1.Deserialize(stream),
2 => CHDFileV2.Deserialize(stream),
3 => CHDFileV3.Deserialize(stream),
4 => CHDFileV4.Deserialize(stream),
5 => CHDFileV5.Deserialize(stream),
_ => null,
};
}
#endregion
}
}