diff options
Diffstat (limited to 'NesFile.cs')
| -rw-r--r-- | NesFile.cs | 47 |
1 files changed, 40 insertions, 7 deletions
@@ -752,7 +752,9 @@ namespace com.clusterrr.Famicom.Containers if (trainer.Length < 512) data.AddRange(Enumerable.Repeat<byte>(0xFF, (int)512 - trainer.Length));
}
data.AddRange(prg);
+ data.AddRange(Enumerable.Repeat<byte>(byte.MaxValue, (int)prgSizePadded - prg.Length));
data.AddRange(chr);
+ data.AddRange(Enumerable.Repeat<byte>(byte.MaxValue, (int)chrSizePadded - chr.Length));
}
else if (Version == iNesVersion.NES20)
{
@@ -846,12 +848,12 @@ namespace com.clusterrr.Famicom.Containers if (trainer.Length > 0)
{
data.AddRange(trainer);
- if (trainer.Length < 512) data.AddRange(Enumerable.Repeat<byte>(0xFF, (int)512 - trainer.Length));
+ if (trainer.Length < 512) data.AddRange(Enumerable.Repeat(byte.MaxValue, (int)512 - trainer.Length));
}
data.AddRange(prg);
- data.AddRange(Enumerable.Repeat<byte>(0xFF, (int)prgSizePadded - prg.Length));
+ data.AddRange(Enumerable.Repeat(byte.MaxValue, (int)prgSizePadded - prg.Length));
data.AddRange(chr);
- data.AddRange(Enumerable.Repeat<byte>(0xFF, (int)chrSizePadded - chr.Length));
+ data.AddRange(Enumerable.Repeat(byte.MaxValue, (int)chrSizePadded - chr.Length));
if (MiscellaneousROMsCount > 0 || miscellaneousROM.Length > 0)
{
if (MiscellaneousROMsCount == 0)
@@ -929,15 +931,46 @@ namespace com.clusterrr.Famicom.Containers /// <returns>MD5 checksum for all PRG and CHR data</returns>
public byte[] CalculateMD5()
{
- var md5 = MD5.Create();
- var alldata = Enumerable.Concat(prg ?? Array.Empty<byte>(), chr ?? Array.Empty<byte>()).ToArray();
- return md5.ComputeHash(alldata);
+ int prgSizeUpPow2 = 1;
+ int chrSizeUpPow2 = 1;
+ while (prgSizeUpPow2 < PRG.Length) prgSizeUpPow2 *= 2;
+ if (CHR.Length == 0)
+ chrSizeUpPow2 = 0;
+ else
+ while (chrSizeUpPow2 < CHR.Length) chrSizeUpPow2 *= 2;
+ using (var md5 = MD5.Create())
+ {
+ md5.TransformBlock(prg, 0, prg.Length, null, 0);
+ md5.TransformBlock(Enumerable.Repeat<byte>(byte.MaxValue, prgSizeUpPow2 - prg.Length).ToArray(), 0, prgSizeUpPow2 - prg.Length, null, 0);
+ md5.TransformBlock(chr, 0, chr.Length, null, 0);
+ md5.TransformBlock(Enumerable.Repeat<byte>(byte.MaxValue, chrSizeUpPow2 - chr.Length).ToArray(), 0, chrSizeUpPow2 - chr.Length, null, 0);
+ md5.TransformFinalBlock(new byte[0], 0, 0);
+ return md5.Hash;
+ }
}
/// <summary>
/// Calculate CRC32 checksum of ROM (CHR+PRG without header)
/// </summary>
/// <returns>CRC32 checksum for all PRG and CHR data</returns>
- public uint CalculateCRC32() => Crc32Calculator.CalculateCRC32(Enumerable.Concat(prg ?? Array.Empty<byte>(), chr ?? Array.Empty<byte>()).ToArray());
+ public uint CalculateCRC32()
+ {
+ int prgSizeUpPow2 = 1;
+ int chrSizeUpPow2 = 1;
+ while (prgSizeUpPow2 < PRG.Length) prgSizeUpPow2 *= 2;
+ if (CHR.Length == 0)
+ chrSizeUpPow2 = 0;
+ else
+ while (chrSizeUpPow2 < CHR.Length) chrSizeUpPow2 *= 2;
+ using (var crc32 = new Crc32())
+ {
+ crc32.TransformBlock(prg, 0, prg.Length, null, 0);
+ crc32.TransformBlock(Enumerable.Repeat<byte>(byte.MaxValue, prgSizeUpPow2 - prg.Length).ToArray(), 0, prgSizeUpPow2 - prg.Length, null, 0);
+ crc32.TransformBlock(chr, 0, chr.Length, null, 0);
+ crc32.TransformBlock(Enumerable.Repeat<byte>(byte.MaxValue, chrSizeUpPow2 - chr.Length).ToArray(), 0, chrSizeUpPow2 - chr.Length, null, 0);
+ crc32.TransformFinalBlock(new byte[0], 0, 0);
+ return BitConverter.ToUInt32(crc32.Hash, 0);
+ }
+ }
}
}
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