aaru-dps/Aaru.Checksums
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General code refactor and cleanup.

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This commit is contained in:
Natalia Portillo
2022-11-23 18:16:04 +00:00
parent 40487268b4
commit aa5bbc1f5b
21 changed files with 340 additions and 331 deletions
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116
CDChecksums.cs
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@@ -31,13 +31,13 @@
// ECC algorithm from ECM(c) 2002-2011 Neill Corlett
// ****************************************************************************/
namespace Aaru.Checksums;
using System;
using System.Collections.Generic;
using Aaru.Console;
using Aaru.Helpers;
namespace Aaru.Checksums;
/// <summary>Implements ReedSolomon and CRC32 algorithms as used by CD-ROM</summary>
public static class CdChecksums
{
@@ -81,8 +81,8 @@ public static class CdChecksums
{
case 2448:
{
var subchannel = new byte[96];
var channel = new byte[2352];
byte[] subchannel = new byte[96];
byte[] channel = new byte[2352];
Array.Copy(buffer, 0, channel, 0, 2352);
Array.Copy(buffer, 2352, subchannel, 0, 96);
@@ -97,11 +97,11 @@ public static class CdChecksums
status = false;
status = channelStatus switch
{
null when subchannelStatus == true => true,
true when subchannelStatus == null => true,
_ => status
};
{
null when subchannelStatus == true => true,
true when subchannelStatus == null => true,
_ => status
};
return status;
}
@@ -120,7 +120,7 @@ public static class CdChecksums
for(uint i = 0; i < 256; i++)
{
uint edc = i;
var j = (uint)((i << 1) ^ ((i & 0x80) == 0x80 ? 0x11D : 0));
uint j = (uint)((i << 1) ^ ((i & 0x80) == 0x80 ? 0x11D : 0));
_eccFTable[i] = (byte)j;
_eccBTable[i ^ j] = (byte)i;
@@ -139,7 +139,7 @@ public static class CdChecksums
for(major = 0; major < majorCount; major++)
{
uint index = (major >> 1) * majorMult + (major & 1);
uint index = ((major >> 1) * majorMult) + (major & 1);
byte eccA = 0;
byte eccB = 0;
uint minor;
@@ -200,7 +200,7 @@ public static class CdChecksums
{
//AaruConsole.DebugWriteLine("CD checksums", "Mode 0 sector at address {0:X2}:{1:X2}:{2:X2}",
// channel[0x00C], channel[0x00D], channel[0x00E]);
for(var i = 0x010; i < 0x930; i++)
for(int i = 0x010; i < 0x930; i++)
if(channel[i] != 0x00)
{
AaruConsole.DebugWriteLine("CD checksums",
@@ -227,11 +227,11 @@ public static class CdChecksums
return false;
case 0x01:
{
var address = new byte[4];
var data = new byte[2060];
var data2 = new byte[2232];
var eccP = new byte[172];
var eccQ = new byte[104];
byte[] address = new byte[4];
byte[] data = new byte[2060];
byte[] data2 = new byte[2232];
byte[] eccP = new byte[172];
byte[] eccQ = new byte[104];
Array.Copy(channel, 0x0C, address, 0, 4);
Array.Copy(channel, 0x10, data, 0, 2060);
@@ -255,7 +255,7 @@ public static class CdChecksums
"Mode 1 sector at address: {0:X2}:{1:X2}:{2:X2}, fails ECC Q check",
channel[0x00C], channel[0x00D], channel[0x00E]);
var storedEdc = BitConverter.ToUInt32(channel, 0x810);
uint storedEdc = BitConverter.ToUInt32(channel, 0x810);
uint calculatedEdc = ComputeEdc(0, channel, 0x810);
correctEdc = calculatedEdc == storedEdc;
@@ -275,7 +275,7 @@ public static class CdChecksums
{
//AaruConsole.DebugWriteLine("CD checksums", "Mode 2 sector at address {0:X2}:{1:X2}:{2:X2}",
// channel[0x00C], channel[0x00D], channel[0x00E]);
var mode2Sector = new byte[channel.Length - 0x10];
byte[] mode2Sector = new byte[channel.Length - 0x10];
Array.Copy(channel, 0x10, mode2Sector, 0, mode2Sector.Length);
if((channel[0x012] & 0x20) == 0x20) // mode 2 form 2
@@ -288,7 +288,7 @@ public static class CdChecksums
"Subheader copies differ in mode 2 form 2 sector at address: {0:X2}:{1:X2}:{2:X2}",
channel[0x00C], channel[0x00D], channel[0x00E]);
var storedEdc = BitConverter.ToUInt32(mode2Sector, 0x91C);
uint storedEdc = BitConverter.ToUInt32(mode2Sector, 0x91C);
// No CRC stored!
if(storedEdc == 0x00000000)
@@ -318,9 +318,9 @@ public static class CdChecksums
"Subheader copies differ in mode 2 form 1 sector at address: {0:X2}:{1:X2}:{2:X2}",
channel[0x00C], channel[0x00D], channel[0x00E]);
var address = new byte[4];
var eccP = new byte[172];
var eccQ = new byte[104];
byte[] address = new byte[4];
byte[] eccP = new byte[172];
byte[] eccQ = new byte[104];
Array.Copy(mode2Sector, 0x80C, eccP, 0, 172);
Array.Copy(mode2Sector, 0x8B8, eccQ, 0, 104);
@@ -341,7 +341,7 @@ public static class CdChecksums
"Mode 2 form 1 sector at address: {0:X2}:{1:X2}:{2:X2}, fails ECC Q check",
channel[0x00C], channel[0x00D], channel[0x00E]);
var storedEdc = BitConverter.ToUInt32(mode2Sector, 0x808);
uint storedEdc = BitConverter.ToUInt32(mode2Sector, 0x808);
uint calculatedEdc = ComputeEdc(0, mode2Sector, 0x808);
correctEdc = calculatedEdc == storedEdc;
@@ -367,7 +367,7 @@ public static class CdChecksums
static uint ComputeEdc(uint edc, IReadOnlyList<byte> src, int size)
{
var pos = 0;
int pos = 0;
for(; size > 0; size--)
edc = (edc >> 8) ^ _edcTable[(edc ^ src[pos++]) & 0xFF];
@@ -377,23 +377,23 @@ public static class CdChecksums
static bool? CheckCdSectorSubChannel(IReadOnlyList<byte> subchannel)
{
bool? status = true;
var qSubChannel = new byte[12];
var cdTextPack1 = new byte[18];
var cdTextPack2 = new byte[18];
var cdTextPack3 = new byte[18];
var cdTextPack4 = new byte[18];
var cdSubRwPack1 = new byte[24];
var cdSubRwPack2 = new byte[24];
var cdSubRwPack3 = new byte[24];
var cdSubRwPack4 = new byte[24];
bool? status = true;
byte[] qSubChannel = new byte[12];
byte[] cdTextPack1 = new byte[18];
byte[] cdTextPack2 = new byte[18];
byte[] cdTextPack3 = new byte[18];
byte[] cdTextPack4 = new byte[18];
byte[] cdSubRwPack1 = new byte[24];
byte[] cdSubRwPack2 = new byte[24];
byte[] cdSubRwPack3 = new byte[24];
byte[] cdSubRwPack4 = new byte[24];
var i = 0;
int i = 0;
for(var j = 0; j < 12; j++)
for(int j = 0; j < 12; j++)
qSubChannel[j] = 0;
for(var j = 0; j < 18; j++)
for(int j = 0; j < 18; j++)
{
cdTextPack1[j] = 0;
cdTextPack2[j] = 0;
@@ -401,7 +401,7 @@ public static class CdChecksums
cdTextPack4[j] = 0;
}
for(var j = 0; j < 24; j++)
for(int j = 0; j < 24; j++)
{
cdSubRwPack1[j] = 0;
cdSubRwPack2[j] = 0;
@@ -409,7 +409,7 @@ public static class CdChecksums
cdSubRwPack4[j] = 0;
}
for(var j = 0; j < 12; j++)
for(int j = 0; j < 12; j++)
{
qSubChannel[j] = (byte)(qSubChannel[j] | ((subchannel[i++] & 0x40) << 1));
qSubChannel[j] = (byte)(qSubChannel[j] | (subchannel[i++] & 0x40));
@@ -423,7 +423,7 @@ public static class CdChecksums
i = 0;
for(var j = 0; j < 18; j++)
for(int j = 0; j < 18; j++)
{
cdTextPack1[j] = (byte)(cdTextPack1[j] | ((subchannel[i++] & 0x3F) << 2));
@@ -440,7 +440,7 @@ public static class CdChecksums
cdTextPack1[j] = (byte)(cdTextPack1[j] | (subchannel[i++] & 0x3F));
}
for(var j = 0; j < 18; j++)
for(int j = 0; j < 18; j++)
{
cdTextPack2[j] = (byte)(cdTextPack2[j] | ((subchannel[i++] & 0x3F) << 2));
@@ -457,7 +457,7 @@ public static class CdChecksums
cdTextPack2[j] = (byte)(cdTextPack2[j] | (subchannel[i++] & 0x3F));
}
for(var j = 0; j < 18; j++)
for(int j = 0; j < 18; j++)
{
cdTextPack3[j] = (byte)(cdTextPack3[j] | ((subchannel[i++] & 0x3F) << 2));
@@ -474,7 +474,7 @@ public static class CdChecksums
cdTextPack3[j] = (byte)(cdTextPack3[j] | (subchannel[i++] & 0x3F));
}
for(var j = 0; j < 18; j++)
for(int j = 0; j < 18; j++)
{
cdTextPack4[j] = (byte)(cdTextPack4[j] | ((subchannel[i++] & 0x3F) << 2));
@@ -493,16 +493,16 @@ public static class CdChecksums
i = 0;
for(var j = 0; j < 24; j++)
for(int j = 0; j < 24; j++)
cdSubRwPack1[j] = (byte)(subchannel[i++] & 0x3F);
for(var j = 0; j < 24; j++)
for(int j = 0; j < 24; j++)
cdSubRwPack2[j] = (byte)(subchannel[i++] & 0x3F);
for(var j = 0; j < 24; j++)
for(int j = 0; j < 24; j++)
cdSubRwPack3[j] = (byte)(subchannel[i++] & 0x3F);
for(var j = 0; j < 24; j++)
for(int j = 0; j < 24; j++)
cdSubRwPack4[j] = (byte)(subchannel[i++] & 0x3F);
switch(cdSubRwPack1[0])
@@ -544,8 +544,8 @@ public static class CdChecksums
break;
}
var qSubChannelCrc = BigEndianBitConverter.ToUInt16(qSubChannel, 10);
var qSubChannelForCrc = new byte[10];
ushort qSubChannelCrc = BigEndianBitConverter.ToUInt16(qSubChannel, 10);
byte[] qSubChannelForCrc = new byte[10];
Array.Copy(qSubChannel, 0, qSubChannelForCrc, 0, 10);
ushort calculatedQcrc = CRC16CCITTContext.Calculate(qSubChannelForCrc);
@@ -559,8 +559,8 @@ public static class CdChecksums
if((cdTextPack1[0] & 0x80) == 0x80)
{
var cdTextPack1Crc = BigEndianBitConverter.ToUInt16(cdTextPack1, 16);
var cdTextPack1ForCrc = new byte[16];
ushort cdTextPack1Crc = BigEndianBitConverter.ToUInt16(cdTextPack1, 16);
byte[] cdTextPack1ForCrc = new byte[16];
Array.Copy(cdTextPack1, 0, cdTextPack1ForCrc, 0, 16);
ushort calculatedCdtp1Crc = CRC16CCITTContext.Calculate(cdTextPack1ForCrc);
@@ -576,8 +576,8 @@ public static class CdChecksums
if((cdTextPack2[0] & 0x80) == 0x80)
{
var cdTextPack2Crc = BigEndianBitConverter.ToUInt16(cdTextPack2, 16);
var cdTextPack2ForCrc = new byte[16];
ushort cdTextPack2Crc = BigEndianBitConverter.ToUInt16(cdTextPack2, 16);
byte[] cdTextPack2ForCrc = new byte[16];
Array.Copy(cdTextPack2, 0, cdTextPack2ForCrc, 0, 16);
ushort calculatedCdtp2Crc = CRC16CCITTContext.Calculate(cdTextPack2ForCrc);
@@ -596,8 +596,8 @@ public static class CdChecksums
if((cdTextPack3[0] & 0x80) == 0x80)
{
var cdTextPack3Crc = BigEndianBitConverter.ToUInt16(cdTextPack3, 16);
var cdTextPack3ForCrc = new byte[16];
ushort cdTextPack3Crc = BigEndianBitConverter.ToUInt16(cdTextPack3, 16);
byte[] cdTextPack3ForCrc = new byte[16];
Array.Copy(cdTextPack3, 0, cdTextPack3ForCrc, 0, 16);
ushort calculatedCdtp3Crc = CRC16CCITTContext.Calculate(cdTextPack3ForCrc);
@@ -617,8 +617,8 @@ public static class CdChecksums
if((cdTextPack4[0] & 0x80) != 0x80)
return status;
var cdTextPack4Crc = BigEndianBitConverter.ToUInt16(cdTextPack4, 16);
var cdTextPack4ForCrc = new byte[16];
ushort cdTextPack4Crc = BigEndianBitConverter.ToUInt16(cdTextPack4, 16);
byte[] cdTextPack4ForCrc = new byte[16];
Array.Copy(cdTextPack4, 0, cdTextPack4ForCrc, 0, 16);
ushort calculatedCdtp4Crc = CRC16CCITTContext.Calculate(cdTextPack4ForCrc);