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

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This commit is contained in:
Natalia Portillo
2022-03-07 07:36:42 +00:00
parent db8c5c6a53
commit 19c7f3d4ff
22 changed files with 1076 additions and 1544 deletions
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126
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
{
@@ -71,8 +71,7 @@ public static class CdChecksums
/// <c>true</c> if all checks were correct, <c>false</c> if any of them weren't, and <c>null</c> if none of them
/// are present.
/// </returns>
public static bool? CheckCdSector(byte[] buffer, out bool? correctEccP, out bool? correctEccQ,
out bool? correctEdc)
public static bool? CheckCdSector(byte[] buffer, out bool? correctEccP, out bool? correctEccQ, out bool? correctEdc)
{
correctEccP = null;
correctEccQ = null;
@@ -82,14 +81,13 @@ public static class CdChecksums
{
case 2448:
{
byte[] subchannel = new byte[96];
byte[] channel = new byte[2352];
var subchannel = new byte[96];
var channel = new byte[2352];
Array.Copy(buffer, 0, channel, 0, 2352);
Array.Copy(buffer, 2352, subchannel, 0, 96);
bool? channelStatus =
CheckCdSectorChannel(channel, out correctEccP, out correctEccQ, out correctEdc);
bool? channelStatus = CheckCdSectorChannel(channel, out correctEccP, out correctEccQ, out correctEdc);
bool? subchannelStatus = CheckCdSectorSubChannel(subchannel);
bool? status = null;
@@ -127,7 +125,7 @@ public static class CdChecksums
for(uint i = 0; i < 256; i++)
{
uint edc = i;
uint j = (uint)((i << 1) ^ ((i & 0x80) == 0x80 ? 0x11D : 0));
var j = (uint)((i << 1) ^ ((i & 0x80) == 0x80 ? 0x11D : 0));
_eccFTable[i] = (byte)j;
_eccBTable[i ^ j] = (byte)i;
@@ -138,15 +136,15 @@ public static class CdChecksums
}
}
static bool CheckEcc(byte[] address, byte[] data, uint majorCount, uint minorCount, uint majorMult,
uint minorInc, byte[] ecc)
static bool CheckEcc(byte[] address, byte[] data, uint majorCount, uint minorCount, uint majorMult, uint minorInc,
byte[] ecc)
{
uint size = majorCount * minorCount;
uint major;
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;
@@ -204,7 +202,7 @@ 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(int i = 0x010; i < 0x930; i++)
for(var i = 0x010; i < 0x930; i++)
if(channel[i] != 0x00)
{
AaruConsole.DebugWriteLine("CD checksums",
@@ -238,11 +236,11 @@ public static class CdChecksums
return false;
}
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];
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];
Array.Copy(channel, 0x0C, address, 0, 4);
Array.Copy(channel, 0x10, data, 0, 2060);
@@ -266,7 +264,7 @@ 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]);
uint storedEdc = BitConverter.ToUInt32(channel, 0x810);
var storedEdc = BitConverter.ToUInt32(channel, 0x810);
uint calculatedEdc = ComputeEdc(0, channel, 0x810);
correctEdc = calculatedEdc == storedEdc;
@@ -285,7 +283,7 @@ 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]);
byte[] mode2Sector = new byte[channel.Length - 0x10];
var mode2Sector = new byte[channel.Length - 0x10];
Array.Copy(channel, 0x10, mode2Sector, 0, mode2Sector.Length);
if((channel[0x012] & 0x20) == 0x20) // mode 2 form 2
@@ -298,7 +296,7 @@ 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]);
uint storedEdc = BitConverter.ToUInt32(mode2Sector, 0x91C);
var storedEdc = BitConverter.ToUInt32(mode2Sector, 0x91C);
// No CRC stored!
if(storedEdc == 0x00000000)
@@ -314,8 +312,7 @@ public static class CdChecksums
AaruConsole.DebugWriteLine("CD checksums",
"Mode 2 form 2 sector at address: {0:X2}:{1:X2}:{2:X2}, got CRC 0x{3:X8} expected 0x{4:X8}",
channel[0x00C], channel[0x00D], channel[0x00E], calculatedEdc,
storedEdc);
channel[0x00C], channel[0x00D], channel[0x00E], calculatedEdc, storedEdc);
return false;
}
@@ -329,9 +326,9 @@ 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]);
byte[] address = new byte[4];
byte[] eccP = new byte[172];
byte[] eccQ = new byte[104];
var address = new byte[4];
var eccP = new byte[172];
var eccQ = new byte[104];
Array.Copy(mode2Sector, 0x80C, eccP, 0, 172);
Array.Copy(mode2Sector, 0x8B8, eccQ, 0, 104);
@@ -352,7 +349,7 @@ 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]);
uint storedEdc = BitConverter.ToUInt32(mode2Sector, 0x808);
var storedEdc = BitConverter.ToUInt32(mode2Sector, 0x808);
uint calculatedEdc = ComputeEdc(0, mode2Sector, 0x808);
correctEdc = calculatedEdc == storedEdc;
@@ -362,8 +359,7 @@ public static class CdChecksums
AaruConsole.DebugWriteLine("CD checksums",
"Mode 2 sector at address: {0:X2}:{1:X2}:{2:X2}, got CRC 0x{3:X8} expected 0x{4:X8}",
channel[0x00C], channel[0x00D], channel[0x00E], calculatedEdc,
storedEdc);
channel[0x00C], channel[0x00D], channel[0x00E], calculatedEdc, storedEdc);
return false;
}
@@ -377,7 +373,7 @@ public static class CdChecksums
static uint ComputeEdc(uint edc, IReadOnlyList<byte> src, int size)
{
int pos = 0;
var pos = 0;
for(; size > 0; size--)
edc = (edc >> 8) ^ _edcTable[(edc ^ src[pos++]) & 0xFF];
@@ -387,23 +383,23 @@ public static class CdChecksums
static bool? CheckCdSectorSubChannel(IReadOnlyList<byte> subchannel)
{
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];
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];
int i = 0;
var i = 0;
for(int j = 0; j < 12; j++)
for(var j = 0; j < 12; j++)
qSubChannel[j] = 0;
for(int j = 0; j < 18; j++)
for(var j = 0; j < 18; j++)
{
cdTextPack1[j] = 0;
cdTextPack2[j] = 0;
@@ -411,7 +407,7 @@ public static class CdChecksums
cdTextPack4[j] = 0;
}
for(int j = 0; j < 24; j++)
for(var j = 0; j < 24; j++)
{
cdSubRwPack1[j] = 0;
cdSubRwPack2[j] = 0;
@@ -419,7 +415,7 @@ public static class CdChecksums
cdSubRwPack4[j] = 0;
}
for(int j = 0; j < 12; j++)
for(var j = 0; j < 12; j++)
{
qSubChannel[j] = (byte)(qSubChannel[j] | ((subchannel[i++] & 0x40) << 1));
qSubChannel[j] = (byte)(qSubChannel[j] | (subchannel[i++] & 0x40));
@@ -433,7 +429,7 @@ public static class CdChecksums
i = 0;
for(int j = 0; j < 18; j++)
for(var j = 0; j < 18; j++)
{
cdTextPack1[j] = (byte)(cdTextPack1[j] | ((subchannel[i++] & 0x3F) << 2));
@@ -450,7 +446,7 @@ public static class CdChecksums
cdTextPack1[j] = (byte)(cdTextPack1[j] | (subchannel[i++] & 0x3F));
}
for(int j = 0; j < 18; j++)
for(var j = 0; j < 18; j++)
{
cdTextPack2[j] = (byte)(cdTextPack2[j] | ((subchannel[i++] & 0x3F) << 2));
@@ -467,7 +463,7 @@ public static class CdChecksums
cdTextPack2[j] = (byte)(cdTextPack2[j] | (subchannel[i++] & 0x3F));
}
for(int j = 0; j < 18; j++)
for(var j = 0; j < 18; j++)
{
cdTextPack3[j] = (byte)(cdTextPack3[j] | ((subchannel[i++] & 0x3F) << 2));
@@ -484,7 +480,7 @@ public static class CdChecksums
cdTextPack3[j] = (byte)(cdTextPack3[j] | (subchannel[i++] & 0x3F));
}
for(int j = 0; j < 18; j++)
for(var j = 0; j < 18; j++)
{
cdTextPack4[j] = (byte)(cdTextPack4[j] | ((subchannel[i++] & 0x3F) << 2));
@@ -503,16 +499,16 @@ public static class CdChecksums
i = 0;
for(int j = 0; j < 24; j++)
for(var j = 0; j < 24; j++)
cdSubRwPack1[j] = (byte)(subchannel[i++] & 0x3F);
for(int j = 0; j < 24; j++)
for(var j = 0; j < 24; j++)
cdSubRwPack2[j] = (byte)(subchannel[i++] & 0x3F);
for(int j = 0; j < 24; j++)
for(var j = 0; j < 24; j++)
cdSubRwPack3[j] = (byte)(subchannel[i++] & 0x3F);
for(int j = 0; j < 24; j++)
for(var j = 0; j < 24; j++)
cdSubRwPack4[j] = (byte)(subchannel[i++] & 0x3F);
switch(cdSubRwPack1[0])
@@ -554,23 +550,23 @@ public static class CdChecksums
break;
}
ushort qSubChannelCrc = BigEndianBitConverter.ToUInt16(qSubChannel, 10);
byte[] qSubChannelForCrc = new byte[10];
var qSubChannelCrc = BigEndianBitConverter.ToUInt16(qSubChannel, 10);
var qSubChannelForCrc = new byte[10];
Array.Copy(qSubChannel, 0, qSubChannelForCrc, 0, 10);
ushort calculatedQcrc = CRC16CCITTContext.Calculate(qSubChannelForCrc);
if(qSubChannelCrc != calculatedQcrc)
{
AaruConsole.DebugWriteLine("CD checksums", "Q subchannel CRC 0x{0:X4}, expected 0x{1:X4}",
calculatedQcrc, qSubChannelCrc);
AaruConsole.DebugWriteLine("CD checksums", "Q subchannel CRC 0x{0:X4}, expected 0x{1:X4}", calculatedQcrc,
qSubChannelCrc);
status = false;
}
if((cdTextPack1[0] & 0x80) == 0x80)
{
ushort cdTextPack1Crc = BigEndianBitConverter.ToUInt16(cdTextPack1, 16);
byte[] cdTextPack1ForCrc = new byte[16];
var cdTextPack1Crc = BigEndianBitConverter.ToUInt16(cdTextPack1, 16);
var cdTextPack1ForCrc = new byte[16];
Array.Copy(cdTextPack1, 0, cdTextPack1ForCrc, 0, 16);
ushort calculatedCdtp1Crc = CRC16CCITTContext.Calculate(cdTextPack1ForCrc);
@@ -586,8 +582,8 @@ public static class CdChecksums
if((cdTextPack2[0] & 0x80) == 0x80)
{
ushort cdTextPack2Crc = BigEndianBitConverter.ToUInt16(cdTextPack2, 16);
byte[] cdTextPack2ForCrc = new byte[16];
var cdTextPack2Crc = BigEndianBitConverter.ToUInt16(cdTextPack2, 16);
var cdTextPack2ForCrc = new byte[16];
Array.Copy(cdTextPack2, 0, cdTextPack2ForCrc, 0, 16);
ushort calculatedCdtp2Crc = CRC16CCITTContext.Calculate(cdTextPack2ForCrc);
@@ -606,8 +602,8 @@ public static class CdChecksums
if((cdTextPack3[0] & 0x80) == 0x80)
{
ushort cdTextPack3Crc = BigEndianBitConverter.ToUInt16(cdTextPack3, 16);
byte[] cdTextPack3ForCrc = new byte[16];
var cdTextPack3Crc = BigEndianBitConverter.ToUInt16(cdTextPack3, 16);
var cdTextPack3ForCrc = new byte[16];
Array.Copy(cdTextPack3, 0, cdTextPack3ForCrc, 0, 16);
ushort calculatedCdtp3Crc = CRC16CCITTContext.Calculate(cdTextPack3ForCrc);
@@ -627,8 +623,8 @@ public static class CdChecksums
if((cdTextPack4[0] & 0x80) != 0x80)
return status;
ushort cdTextPack4Crc = BigEndianBitConverter.ToUInt16(cdTextPack4, 16);
byte[] cdTextPack4ForCrc = new byte[16];
var cdTextPack4Crc = BigEndianBitConverter.ToUInt16(cdTextPack4, 16);
var cdTextPack4ForCrc = new byte[16];
Array.Copy(cdTextPack4, 0, cdTextPack4ForCrc, 0, 16);
ushort calculatedCdtp4Crc = CRC16CCITTContext.Calculate(cdTextPack4ForCrc);