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# Library for ISO Rebuild Data (LibIRD)
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This .NET library provides methods for generating, writing, and reading IRD files. Functionality is provided for deterministically generating IRDs such that a redump ISO and key have a 1-to-1 correspondence with an unique IRD file.
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.NET library for generating, writing, and reading IRD files. Functionality is provided for deterministically generating IRDs such that a redump ISO and key have a 1-to-1 correspondence with an IRD file.
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## How to use LibIRD
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### Reproducible, redump-style IRDs
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The standard way of generating a reproducible, redump-style IRD with LibIRD is with a redump ISO file and a redump key file (e.g. http://redump.org/disc/28721/key/):
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```
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The standard way of generating a reproducible, redump-style IRD is with a redump ISO file and a redump key file (e.g. http://redump.org/disc/28721/key/):
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```cs
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byte[] discKey = File.ReadAllBytes("./game.key");
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IRD ird = new ReIRD("./game.iso", discKey);
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```
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alternatively, the disc key can be extracted from a [ManaGunZ](https://github.com/Zarh/ManaGunZ/) .getkey.log file:
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```
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Alternatively, the disc key can be extracted from a [ManaGunZ](https://github.com/Zarh/ManaGunZ/) log file:
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```cs
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IRD ird = new ReIRD("./game.iso", "./game.getkey.log");
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```
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### Custom IRDs
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Functionality is also provided for creating custom IRDs, with whatever data you want. One way is to use an ISO with a custom disc key, disc ID, and PIC:
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```
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Functionality is also provided for creating IRDs with a custom disc key, disc ID, and PIC:
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```cs
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byte[] discKey = new byte[16];
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byte[] discID = new byte[16];
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byte[] PIC = new byte[115];
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// Set vars to desired values
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IRD ird = new IRD("./game.iso", discKey, discID, discPIC);
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```
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As before, a [ManaGunZ](https://github.com/Zarh/ManaGunZ/) log file can also be used with an ISO to create an IRD, with the disc key, disc ID, and PIC all being extracted from the .getkey.log file.
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```
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As before, a [ManaGunZ](https://github.com/Zarh/ManaGunZ/) log file can also be used with an ISO to create a custom IRD, with the disc key, disc ID, and PIC all being extracted from the log file (rather than just the key).
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```cs
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IRD ird = new IRD("./game.iso", "./game.getkey.log");
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```
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Finally, an existing IRD file can be read to create an IRD:
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```
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```cs
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IRD ird = IRD.Read("./game.ird")
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```
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An IRD can be then be tweaked, its fields printed, and written to a new IRD:
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```
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```cs
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ird.UID = 0x9F1A51D8;
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ird.Print();
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ird.Write("game2.ird");
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