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https://github.com/aaru-dps/Aaru.Server.git
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🐛Correct CD ECC calcuations, fixes #170.
This commit is contained in:
@@ -42,8 +42,8 @@ namespace DiscImageChef.Checksums
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/// </summary>
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/// </summary>
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public static class CdChecksums
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public static class CdChecksums
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{
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{
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const uint CDCRC32_POLY = 0xD8018001;
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const uint CDCRC32_POLY = 0xD8018001;
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const uint CDCRC32_SEED = 0x00000000;
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const uint CDCRC32_SEED = 0x00000000;
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static byte[] eccFTable;
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static byte[] eccFTable;
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static byte[] eccBTable;
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static byte[] eccBTable;
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@@ -78,14 +78,14 @@ namespace DiscImageChef.Checksums
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case 2448:
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case 2448:
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{
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{
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byte[] subchannel = new byte[96];
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byte[] subchannel = new byte[96];
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byte[] channel = new byte[2352];
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byte[] channel = new byte[2352];
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Array.Copy(buffer, 0, channel, 0, 2352);
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Array.Copy(buffer, 0, channel, 0, 2352);
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Array.Copy(buffer, 2352, subchannel, 0, 96);
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Array.Copy(buffer, 2352, subchannel, 0, 96);
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bool? channelStatus = CheckCdSectorChannel(channel);
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bool? channelStatus = CheckCdSectorChannel(channel);
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bool? subchannelStatus = CheckCdSectorSubChannel(subchannel);
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bool? subchannelStatus = CheckCdSectorSubChannel(subchannel);
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bool? status = null;
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bool? status = null;
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if(channelStatus == false || subchannelStatus == false) status = false;
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if(channelStatus == false || subchannelStatus == false) status = false;
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switch(channelStatus)
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switch(channelStatus)
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@@ -101,7 +101,7 @@ namespace DiscImageChef.Checksums
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return status;
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return status;
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}
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}
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case 2352: return CheckCdSectorChannel(buffer);
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case 2352: return CheckCdSectorChannel(buffer);
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default: return null;
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default: return null;
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}
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}
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}
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}
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@@ -113,31 +113,31 @@ namespace DiscImageChef.Checksums
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for(uint i = 0; i < 256; i++)
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for(uint i = 0; i < 256; i++)
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{
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{
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uint j = (uint)((i << 1) ^ ((i & 0x80) == 0x80 ? 0x11D : 0));
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uint j = (uint)((i << 1) ^ ((i & 0x80) == 0x80 ? 0x11D : 0));
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eccFTable[i] = (byte)j;
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eccFTable[i] = (byte)j;
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eccBTable[i ^ j] = (byte)i;
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eccBTable[i ^ j] = (byte)i;
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}
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}
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}
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}
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static bool CheckEcc(byte[] address, byte[] data, uint majorCount, uint minorCount, uint majorMult,
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static bool CheckEcc(byte[] address, byte[] data, uint majorCount, uint minorCount, uint majorMult,
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uint minorInc, byte[] ecc)
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uint minorInc, byte[] ecc)
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{
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{
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uint size = majorCount * minorCount;
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uint size = majorCount * minorCount;
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uint major;
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uint major;
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for(major = 0; major < majorCount; major++)
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for(major = 0; major < majorCount; major++)
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{
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{
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uint index = (major >> 1) * majorMult + (major & 1);
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uint index = (major >> 1) * majorMult + (major & 1);
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byte eccA = 0;
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byte eccA = 0;
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byte eccB = 0;
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byte eccB = 0;
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uint minor;
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uint minor;
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for(minor = 0; minor < minorCount; minor++)
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for(minor = 0; minor < minorCount; minor++)
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{
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{
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byte temp;
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byte temp;
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temp = index < 4 ? address[index] : data[index - 4];
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temp = index < 4 ? address[index] : data[index - 4];
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index += minorInc;
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index += minorInc;
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if(index >= size) index -= size;
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if(index >= size) index -= size;
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eccA ^= temp;
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eccA ^= temp;
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eccB ^= temp;
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eccB ^= temp;
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eccA = eccFTable[eccA];
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eccA = eccFTable[eccA];
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}
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}
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eccA = eccBTable[eccFTable[eccA] ^ eccB];
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eccA = eccBTable[eccFTable[eccA] ^ eccB];
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@@ -191,19 +191,19 @@ namespace DiscImageChef.Checksums
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}
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}
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byte[] address = new byte[4];
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byte[] address = new byte[4];
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byte[] data = new byte[2060];
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byte[] data = new byte[2060];
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byte[] data2 = new byte[2232];
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byte[] data2 = new byte[2232];
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byte[] eccP = new byte[172];
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byte[] eccP = new byte[172];
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byte[] eccQ = new byte[104];
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byte[] eccQ = new byte[104];
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Array.Copy(channel, 0x0C, address, 0, 4);
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Array.Copy(channel, 0x0C, address, 0, 4);
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Array.Copy(channel, 0x0C, data, 0, 2060);
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Array.Copy(channel, 0x10, data, 0, 2060);
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Array.Copy(channel, 0x0C, data2, 0, 2232);
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Array.Copy(channel, 0x10, data2, 0, 2232);
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Array.Copy(channel, 0x81C, eccP, 0, 172);
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Array.Copy(channel, 0x81C, eccP, 0, 172);
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Array.Copy(channel, 0x8C8, eccQ, 0, 104);
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Array.Copy(channel, 0x8C8, eccQ, 0, 104);
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bool failedEccP = CheckEcc(address, data, 86, 24, 2, 86, eccP);
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bool failedEccP = !CheckEcc(address, data, 86, 24, 2, 86, eccP);
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bool failedEccQ = CheckEcc(address, data2, 52, 43, 86, 88, eccQ);
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bool failedEccQ = !CheckEcc(address, data2, 52, 43, 86, 88, eccQ);
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if(failedEccP)
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if(failedEccP)
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DicConsole.DebugWriteLine("CD checksums",
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DicConsole.DebugWriteLine("CD checksums",
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@@ -267,22 +267,22 @@ namespace DiscImageChef.Checksums
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channel[0x00C], channel[0x00D], channel[0x00E]);
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channel[0x00C], channel[0x00D], channel[0x00E]);
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byte[] address = new byte[4];
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byte[] address = new byte[4];
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byte[] data = new byte[2060];
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byte[] data = new byte[2060];
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byte[] data2 = new byte[2232];
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byte[] data2 = new byte[2232];
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byte[] eccP = new byte[172];
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byte[] eccP = new byte[172];
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byte[] eccQ = new byte[104];
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byte[] eccQ = new byte[104];
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address[0] = 0;
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address[0] = 0;
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address[1] = 0;
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address[1] = 0;
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address[2] = 0;
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address[2] = 0;
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address[3] = 0;
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address[3] = 0;
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Array.Copy(channel, 0x0C, data, 0, 2060);
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Array.Copy(channel, 0x10, data, 0, 2060);
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Array.Copy(channel, 0x0C, data2, 0, 2232);
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Array.Copy(channel, 0x10, data2, 0, 2232);
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Array.Copy(channel, 0x80C, eccP, 0, 172);
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Array.Copy(channel, 0x80C, eccP, 0, 172);
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Array.Copy(channel, 0x8B8, eccQ, 0, 104);
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Array.Copy(channel, 0x8B8, eccQ, 0, 104);
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bool failedEccP = CheckEcc(address, data, 86, 24, 2, 86, eccP);
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bool failedEccP = !CheckEcc(address, data, 86, 24, 2, 86, eccP);
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bool failedEccQ = CheckEcc(address, data2, 52, 43, 86, 88, eccQ);
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bool failedEccQ = !CheckEcc(address, data2, 52, 43, 86, 88, eccQ);
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if(failedEccP)
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if(failedEccP)
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DicConsole.DebugWriteLine("CD checksums",
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DicConsole.DebugWriteLine("CD checksums",
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@@ -320,18 +320,18 @@ namespace DiscImageChef.Checksums
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static bool? CheckCdSectorSubChannel(byte[] subchannel)
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static bool? CheckCdSectorSubChannel(byte[] subchannel)
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{
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{
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bool? status = true;
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bool? status = true;
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byte[] qSubChannel = new byte[12];
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byte[] qSubChannel = new byte[12];
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byte[] cdTextPack1 = new byte[18];
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byte[] cdTextPack1 = new byte[18];
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byte[] cdTextPack2 = new byte[18];
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byte[] cdTextPack2 = new byte[18];
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byte[] cdTextPack3 = new byte[18];
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byte[] cdTextPack3 = new byte[18];
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byte[] cdTextPack4 = new byte[18];
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byte[] cdTextPack4 = new byte[18];
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byte[] cdSubRwPack1 = new byte[24];
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byte[] cdSubRwPack1 = new byte[24];
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byte[] cdSubRwPack2 = new byte[24];
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byte[] cdSubRwPack2 = new byte[24];
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byte[] cdSubRwPack3 = new byte[24];
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byte[] cdSubRwPack3 = new byte[24];
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byte[] cdSubRwPack4 = new byte[24];
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byte[] cdSubRwPack4 = new byte[24];
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int i = 0;
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int i = 0;
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for(int j = 0; j < 12; j++) qSubChannel[j] = 0;
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for(int j = 0; j < 12; j++) qSubChannel[j] = 0;
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for(int j = 0; j < 18; j++)
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for(int j = 0; j < 18; j++)
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{
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{
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@@ -340,6 +340,7 @@ namespace DiscImageChef.Checksums
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cdTextPack3[j] = 0;
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cdTextPack3[j] = 0;
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cdTextPack4[j] = 0;
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cdTextPack4[j] = 0;
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}
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}
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for(int j = 0; j < 24; j++)
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for(int j = 0; j < 24; j++)
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{
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{
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cdSubRwPack1[j] = 0;
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cdSubRwPack1[j] = 0;
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@@ -363,39 +364,42 @@ namespace DiscImageChef.Checksums
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i = 0;
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i = 0;
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for(int j = 0; j < 18; j++)
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for(int j = 0; j < 18; j++)
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{
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{
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if(j < 18) cdTextPack1[j] = (byte)(cdTextPack1[j] | ((subchannel[i++] & 0x3F) << 2));
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if(j < 18) cdTextPack1[j] = (byte)(cdTextPack1[j] | ((subchannel[i++] & 0x3F) << 2));
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if(j < 18) cdTextPack1[j] = (byte)(cdTextPack1[j++] | ((subchannel[i] & 0xC0) >> 4));
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if(j < 18) cdTextPack1[j] = (byte)(cdTextPack1[j++] | ((subchannel[i] & 0xC0) >> 4));
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if(j < 18) cdTextPack1[j] = (byte)(cdTextPack1[j] | ((subchannel[i++] & 0x0F) << 4));
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if(j < 18) cdTextPack1[j] = (byte)(cdTextPack1[j] | ((subchannel[i++] & 0x0F) << 4));
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if(j < 18) cdTextPack1[j] = (byte)(cdTextPack1[j++] | ((subchannel[i] & 0x3C) >> 2));
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if(j < 18) cdTextPack1[j] = (byte)(cdTextPack1[j++] | ((subchannel[i] & 0x3C) >> 2));
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if(j < 18) cdTextPack1[j] = (byte)(cdTextPack1[j] | ((subchannel[i++] & 0x03) << 6));
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if(j < 18) cdTextPack1[j] = (byte)(cdTextPack1[j] | ((subchannel[i++] & 0x03) << 6));
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if(j < 18) cdTextPack1[j] = (byte)(cdTextPack1[j] | (subchannel[i++] & 0x3F));
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if(j < 18) cdTextPack1[j] = (byte)(cdTextPack1[j] | (subchannel[i++] & 0x3F));
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}
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}
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for(int j = 0; j < 18; j++)
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for(int j = 0; j < 18; j++)
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{
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{
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if(j < 18) cdTextPack2[j] = (byte)(cdTextPack2[j] | ((subchannel[i++] & 0x3F) << 2));
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if(j < 18) cdTextPack2[j] = (byte)(cdTextPack2[j] | ((subchannel[i++] & 0x3F) << 2));
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if(j < 18) cdTextPack2[j] = (byte)(cdTextPack2[j++] | ((subchannel[i] & 0xC0) >> 4));
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if(j < 18) cdTextPack2[j] = (byte)(cdTextPack2[j++] | ((subchannel[i] & 0xC0) >> 4));
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if(j < 18) cdTextPack2[j] = (byte)(cdTextPack2[j] | ((subchannel[i++] & 0x0F) << 4));
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if(j < 18) cdTextPack2[j] = (byte)(cdTextPack2[j] | ((subchannel[i++] & 0x0F) << 4));
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if(j < 18) cdTextPack2[j] = (byte)(cdTextPack2[j++] | ((subchannel[i] & 0x3C) >> 2));
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if(j < 18) cdTextPack2[j] = (byte)(cdTextPack2[j++] | ((subchannel[i] & 0x3C) >> 2));
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if(j < 18) cdTextPack2[j] = (byte)(cdTextPack2[j] | ((subchannel[i++] & 0x03) << 6));
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if(j < 18) cdTextPack2[j] = (byte)(cdTextPack2[j] | ((subchannel[i++] & 0x03) << 6));
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if(j < 18) cdTextPack2[j] = (byte)(cdTextPack2[j] | (subchannel[i++] & 0x3F));
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if(j < 18) cdTextPack2[j] = (byte)(cdTextPack2[j] | (subchannel[i++] & 0x3F));
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}
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}
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for(int j = 0; j < 18; j++)
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for(int j = 0; j < 18; j++)
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{
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{
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if(j < 18) cdTextPack3[j] = (byte)(cdTextPack3[j] | ((subchannel[i++] & 0x3F) << 2));
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if(j < 18) cdTextPack3[j] = (byte)(cdTextPack3[j] | ((subchannel[i++] & 0x3F) << 2));
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if(j < 18) cdTextPack3[j] = (byte)(cdTextPack3[j++] | ((subchannel[i] & 0xC0) >> 4));
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if(j < 18) cdTextPack3[j] = (byte)(cdTextPack3[j++] | ((subchannel[i] & 0xC0) >> 4));
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if(j < 18) cdTextPack3[j] = (byte)(cdTextPack3[j] | ((subchannel[i++] & 0x0F) << 4));
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if(j < 18) cdTextPack3[j] = (byte)(cdTextPack3[j] | ((subchannel[i++] & 0x0F) << 4));
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if(j < 18) cdTextPack3[j] = (byte)(cdTextPack3[j++] | ((subchannel[i] & 0x3C) >> 2));
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if(j < 18) cdTextPack3[j] = (byte)(cdTextPack3[j++] | ((subchannel[i] & 0x3C) >> 2));
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if(j < 18) cdTextPack3[j] = (byte)(cdTextPack3[j] | ((subchannel[i++] & 0x03) << 6));
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if(j < 18) cdTextPack3[j] = (byte)(cdTextPack3[j] | ((subchannel[i++] & 0x03) << 6));
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if(j < 18) cdTextPack3[j] = (byte)(cdTextPack3[j] | (subchannel[i++] & 0x3F));
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if(j < 18) cdTextPack3[j] = (byte)(cdTextPack3[j] | (subchannel[i++] & 0x3F));
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}
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}
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for(int j = 0; j < 18; j++)
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for(int j = 0; j < 18; j++)
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{
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{
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if(j < 18) cdTextPack4[j] = (byte)(cdTextPack4[j] | ((subchannel[i++] & 0x3F) << 2));
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if(j < 18) cdTextPack4[j] = (byte)(cdTextPack4[j] | ((subchannel[i++] & 0x3F) << 2));
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if(j < 18) cdTextPack4[j] = (byte)(cdTextPack4[j++] | ((subchannel[i] & 0xC0) >> 4));
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if(j < 18) cdTextPack4[j] = (byte)(cdTextPack4[j++] | ((subchannel[i] & 0xC0) >> 4));
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if(j < 18) cdTextPack4[j] = (byte)(cdTextPack4[j] | ((subchannel[i++] & 0x0F) << 4));
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if(j < 18) cdTextPack4[j] = (byte)(cdTextPack4[j] | ((subchannel[i++] & 0x0F) << 4));
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if(j < 18) cdTextPack4[j] = (byte)(cdTextPack4[j++] | ((subchannel[i] & 0x3C) >> 2));
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if(j < 18) cdTextPack4[j] = (byte)(cdTextPack4[j++] | ((subchannel[i] & 0x3C) >> 2));
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if(j < 18) cdTextPack4[j] = (byte)(cdTextPack4[j] | ((subchannel[i++] & 0x03) << 6));
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if(j < 18) cdTextPack4[j] = (byte)(cdTextPack4[j] | ((subchannel[i++] & 0x03) << 6));
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if(j < 18) cdTextPack4[j] = (byte)(cdTextPack4[j] | (subchannel[i++] & 0x3F));
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if(j < 18) cdTextPack4[j] = (byte)(cdTextPack4[j] | (subchannel[i++] & 0x3F));
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}
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}
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i = 0;
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i = 0;
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@@ -437,7 +441,7 @@ namespace DiscImageChef.Checksums
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|
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BigEndianBitConverter.IsLittleEndian = true;
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BigEndianBitConverter.IsLittleEndian = true;
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ushort qSubChannelCrc = BigEndianBitConverter.ToUInt16(qSubChannel, 10);
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ushort qSubChannelCrc = BigEndianBitConverter.ToUInt16(qSubChannel, 10);
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byte[] qSubChannelForCrc = new byte[10];
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byte[] qSubChannelForCrc = new byte[10];
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Array.Copy(qSubChannel, 0, qSubChannelForCrc, 0, 10);
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Array.Copy(qSubChannel, 0, qSubChannelForCrc, 0, 10);
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ushort calculatedQcrc = CalculateCCITT_CRC16(qSubChannelForCrc);
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ushort calculatedQcrc = CalculateCCITT_CRC16(qSubChannelForCrc);
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@@ -451,7 +455,7 @@ namespace DiscImageChef.Checksums
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|
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if((cdTextPack1[0] & 0x80) == 0x80)
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if((cdTextPack1[0] & 0x80) == 0x80)
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{
|
{
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ushort cdTextPack1Crc = BigEndianBitConverter.ToUInt16(cdTextPack1, 16);
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ushort cdTextPack1Crc = BigEndianBitConverter.ToUInt16(cdTextPack1, 16);
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byte[] cdTextPack1ForCrc = new byte[16];
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byte[] cdTextPack1ForCrc = new byte[16];
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Array.Copy(cdTextPack1, 0, cdTextPack1ForCrc, 0, 16);
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Array.Copy(cdTextPack1, 0, cdTextPack1ForCrc, 0, 16);
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ushort calculatedCdtp1Crc = CalculateCCITT_CRC16(cdTextPack1ForCrc);
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ushort calculatedCdtp1Crc = CalculateCCITT_CRC16(cdTextPack1ForCrc);
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@@ -466,7 +470,7 @@ namespace DiscImageChef.Checksums
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|
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if((cdTextPack2[0] & 0x80) == 0x80)
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if((cdTextPack2[0] & 0x80) == 0x80)
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{
|
{
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ushort cdTextPack2Crc = BigEndianBitConverter.ToUInt16(cdTextPack2, 16);
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ushort cdTextPack2Crc = BigEndianBitConverter.ToUInt16(cdTextPack2, 16);
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byte[] cdTextPack2ForCrc = new byte[16];
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byte[] cdTextPack2ForCrc = new byte[16];
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Array.Copy(cdTextPack2, 0, cdTextPack2ForCrc, 0, 16);
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Array.Copy(cdTextPack2, 0, cdTextPack2ForCrc, 0, 16);
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ushort calculatedCdtp2Crc = CalculateCCITT_CRC16(cdTextPack2ForCrc);
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ushort calculatedCdtp2Crc = CalculateCCITT_CRC16(cdTextPack2ForCrc);
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@@ -483,7 +487,7 @@ namespace DiscImageChef.Checksums
|
|||||||
|
|
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if((cdTextPack3[0] & 0x80) == 0x80)
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if((cdTextPack3[0] & 0x80) == 0x80)
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{
|
{
|
||||||
ushort cdTextPack3Crc = BigEndianBitConverter.ToUInt16(cdTextPack3, 16);
|
ushort cdTextPack3Crc = BigEndianBitConverter.ToUInt16(cdTextPack3, 16);
|
||||||
byte[] cdTextPack3ForCrc = new byte[16];
|
byte[] cdTextPack3ForCrc = new byte[16];
|
||||||
Array.Copy(cdTextPack3, 0, cdTextPack3ForCrc, 0, 16);
|
Array.Copy(cdTextPack3, 0, cdTextPack3ForCrc, 0, 16);
|
||||||
ushort calculatedCdtp3Crc = CalculateCCITT_CRC16(cdTextPack3ForCrc);
|
ushort calculatedCdtp3Crc = CalculateCCITT_CRC16(cdTextPack3ForCrc);
|
||||||
@@ -500,7 +504,7 @@ namespace DiscImageChef.Checksums
|
|||||||
|
|
||||||
if((cdTextPack4[0] & 0x80) != 0x80) return status;
|
if((cdTextPack4[0] & 0x80) != 0x80) return status;
|
||||||
|
|
||||||
ushort cdTextPack4Crc = BigEndianBitConverter.ToUInt16(cdTextPack4, 16);
|
ushort cdTextPack4Crc = BigEndianBitConverter.ToUInt16(cdTextPack4, 16);
|
||||||
byte[] cdTextPack4ForCrc = new byte[16];
|
byte[] cdTextPack4ForCrc = new byte[16];
|
||||||
Array.Copy(cdTextPack4, 0, cdTextPack4ForCrc, 0, 16);
|
Array.Copy(cdTextPack4, 0, cdTextPack4ForCrc, 0, 16);
|
||||||
ushort calculatedCdtp4Crc = CalculateCCITT_CRC16(cdTextPack4ForCrc);
|
ushort calculatedCdtp4Crc = CalculateCCITT_CRC16(cdTextPack4ForCrc);
|
||||||
|
|||||||
Reference in New Issue
Block a user