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BizHawk
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update ROM header detection algorithm. Fixes some homebrew roms which have no header and aren't padded to a multiple of 1024 bytes.

This commit is contained in:
beirich 2012-06-03 05:39:30 +00:00
parent c7db5fd543
commit 775845184c
1 changed files with 12 additions and 2 deletions
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14
BizHawk.MultiClient/RomGame.cs
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@ -9,7 +9,7 @@ namespace BizHawk.MultiClient
public byte[] FileData;
public GameInfo GameInfo;
private const int BankSize = 4096;
private const int BankSize = 1024;
public RomGame() { }
@ -21,10 +21,20 @@ namespace BizHawk.MultiClient
throw new Exception("The file needs to exist, yo.");
var stream = file.GetStream();
FileData = Util.ReadAllBytes(stream);
// if we're offset exactly 512 bytes from a 1024-byte boundary,
// assume we have a header of that size. Otherwise, assume it's just all rom.
// Other 'recognized' header sizes may need to be added.
int header = (int)(stream.Length % BankSize);
if (header.In(0, 512) == false)
{
Console.WriteLine("ROM was not a multiple of 1024 bytes, and not a recognized header size: {0}. Assume it's purely ROM data.", header);
header = 0;
}
else if (header > 0)
Console.WriteLine("Assuming header of {0} bytes.", header);
stream.Position = header;
int length = (int)stream.Length - header;