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fix: fusion code between partition offsets helper tool gpt code and m…
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…ain tool gpt code
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@gus33000
gus33000 committed Feb 27, 2024
1 parent d37fa80 commit d5dbba1
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79 changes: 79 additions & 0 deletions PartitionOffsetsHelperTool/GPT/CRC32.cs
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Original file line number Diff line number Diff line change
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using System;

namespace PartitionOffsetsHelperTool.GPT
{
internal static class CRC32
{
private static readonly uint[] CRC32Table =
[
0x00000000, 0x77073096, 0xEE0E612C, 0x990951BA, 0x076DC419, 0x706AF48F,
0xE963A535, 0x9E6495A3, 0x0EDB8832, 0x79DCB8A4, 0xE0D5E91E, 0x97D2D988,
0x09B64C2B, 0x7EB17CBD, 0xE7B82D07, 0x90BF1D91, 0x1DB71064, 0x6AB020F2,
0xF3B97148, 0x84BE41DE, 0x1ADAD47D, 0x6DDDE4EB, 0xF4D4B551, 0x83D385C7,
0x136C9856, 0x646BA8C0, 0xFD62F97A, 0x8A65C9EC, 0x14015C4F, 0x63066CD9,
0xFA0F3D63, 0x8D080DF5, 0x3B6E20C8, 0x4C69105E, 0xD56041E4, 0xA2677172,
0x3C03E4D1, 0x4B04D447, 0xD20D85FD, 0xA50AB56B, 0x35B5A8FA, 0x42B2986C,
0xDBBBC9D6, 0xACBCF940, 0x32D86CE3, 0x45DF5C75, 0xDCD60DCF, 0xABD13D59,
0x26D930AC, 0x51DE003A, 0xC8D75180, 0xBFD06116, 0x21B4F4B5, 0x56B3C423,
0xCFBA9599, 0xB8BDA50F, 0x2802B89E, 0x5F058808, 0xC60CD9B2, 0xB10BE924,
0x2F6F7C87, 0x58684C11, 0xC1611DAB, 0xB6662D3D, 0x76DC4190, 0x01DB7106,
0x98D220BC, 0xEFD5102A, 0x71B18589, 0x06B6B51F, 0x9FBFE4A5, 0xE8B8D433,
0x7807C9A2, 0x0F00F934, 0x9609A88E, 0xE10E9818, 0x7F6A0DBB, 0x086D3D2D,
0x91646C97, 0xE6635C01, 0x6B6B51F4, 0x1C6C6162, 0x856530D8, 0xF262004E,
0x6C0695ED, 0x1B01A57B, 0x8208F4C1, 0xF50FC457, 0x65B0D9C6, 0x12B7E950,
0x8BBEB8EA, 0xFCB9887C, 0x62DD1DDF, 0x15DA2D49, 0x8CD37CF3, 0xFBD44C65,
0x4DB26158, 0x3AB551CE, 0xA3BC0074, 0xD4BB30E2, 0x4ADFA541, 0x3DD895D7,
0xA4D1C46D, 0xD3D6F4FB, 0x4369E96A, 0x346ED9FC, 0xAD678846, 0xDA60B8D0,
0x44042D73, 0x33031DE5, 0xAA0A4C5F, 0xDD0D7CC9, 0x5005713C, 0x270241AA,
0xBE0B1010, 0xC90C2086, 0x5768B525, 0x206F85B3, 0xB966D409, 0xCE61E49F,
0x5EDEF90E, 0x29D9C998, 0xB0D09822, 0xC7D7A8B4, 0x59B33D17, 0x2EB40D81,
0xB7BD5C3B, 0xC0BA6CAD, 0xEDB88320, 0x9ABFB3B6, 0x03B6E20C, 0x74B1D29A,
0xEAD54739, 0x9DD277AF, 0x04DB2615, 0x73DC1683, 0xE3630B12, 0x94643B84,
0x0D6D6A3E, 0x7A6A5AA8, 0xE40ECF0B, 0x9309FF9D, 0x0A00AE27, 0x7D079EB1,
0xF00F9344, 0x8708A3D2, 0x1E01F268, 0x6906C2FE, 0xF762575D, 0x806567CB,
0x196C3671, 0x6E6B06E7, 0xFED41B76, 0x89D32BE0, 0x10DA7A5A, 0x67DD4ACC,
0xF9B9DF6F, 0x8EBEEFF9, 0x17B7BE43, 0x60B08ED5, 0xD6D6A3E8, 0xA1D1937E,
0x38D8C2C4, 0x4FDFF252, 0xD1BB67F1, 0xA6BC5767, 0x3FB506DD, 0x48B2364B,
0xD80D2BDA, 0xAF0A1B4C, 0x36034AF6, 0x41047A60, 0xDF60EFC3, 0xA867DF55,
0x316E8EEF, 0x4669BE79, 0xCB61B38C, 0xBC66831A, 0x256FD2A0, 0x5268E236,
0xCC0C7795, 0xBB0B4703, 0x220216B9, 0x5505262F, 0xC5BA3BBE, 0xB2BD0B28,
0x2BB45A92, 0x5CB36A04, 0xC2D7FFA7, 0xB5D0CF31, 0x2CD99E8B, 0x5BDEAE1D,
0x9B64C2B0, 0xEC63F226, 0x756AA39C, 0x026D930A, 0x9C0906A9, 0xEB0E363F,
0x72076785, 0x05005713, 0x95BF4A82, 0xE2B87A14, 0x7BB12BAE, 0x0CB61B38,
0x92D28E9B, 0xE5D5BE0D, 0x7CDCEFB7, 0x0BDBDF21, 0x86D3D2D4, 0xF1D4E242,
0x68DDB3F8, 0x1FDA836E, 0x81BE16CD, 0xF6B9265B, 0x6FB077E1, 0x18B74777,
0x88085AE6, 0xFF0F6A70, 0x66063BCA, 0x11010B5C, 0x8F659EFF, 0xF862AE69,
0x616BFFD3, 0x166CCF45, 0xA00AE278, 0xD70DD2EE, 0x4E048354, 0x3903B3C2,
0xA7672661, 0xD06016F7, 0x4969474D, 0x3E6E77DB, 0xAED16A4A, 0xD9D65ADC,
0x40DF0B66, 0x37D83BF0, 0xA9BCAE53, 0xDEBB9EC5, 0x47B2CF7F, 0x30B5FFE9,
0xBDBDF21C, 0xCABAC28A, 0x53B39330, 0x24B4A3A6, 0xBAD03605, 0xCDD70693,
0x54DE5729, 0x23D967BF, 0xB3667A2E, 0xC4614AB8, 0x5D681B02, 0x2A6F2B94,
0xB40BBE37, 0xC30C8EA1, 0x5A05DF1B, 0x2D02EF8D
];

internal static uint Compute(byte[] Input, uint Offset, uint Length)
{
if (Input == null || Offset + Length > Input.Length)
{
throw new ArgumentException("The provided input buffer is invalid", nameof(Input));
}

unchecked
{
uint crc = (uint)((uint)0 ^ -1);
for (uint i = Offset; i < Offset + Length; i++)
{
crc = (crc >> 8) ^ CRC32Table[(crc ^ Input[i]) & 0xFF];
}
crc = (uint)(crc ^ -1);

if (crc < 0)
{
crc += (uint)0x100000000;
}

return crc;
}
}
}
}
77 changes: 77 additions & 0 deletions PartitionOffsetsHelperTool/GPT/GPTHeader.cs
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using System;

namespace PartitionOffsetsHelperTool.GPT
{
public class GPTHeader
{
public string Signature
{
get; set;
}

public uint Revision
{
get; set;
}

public uint Size
{
get; set;
}

public uint CRC32
{
get; set;
}

public uint Reserved
{
get; set;
}

public ulong CurrentLBA
{
get; set;
}

public ulong BackupLBA
{
get; set;
}

public ulong FirstUsableLBA
{
get; set;
}

public ulong LastUsableLBA
{
get; set;
}

public Guid DiskGUID
{
get; set;
}

public ulong PartitionArrayLBA
{
get; set;
}

public uint PartitionEntryCount
{
get; set;
}

public uint PartitionEntrySize
{
get; set;
}

public uint PartitionArrayCRC32
{
get; set;
}
}
}
183 changes: 171 additions & 12 deletions PartitionOffsetsHelperTool/GPT/GPTUtils.cs
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Original file line number Diff line number Diff line change
@@ -1,16 +1,24 @@
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace PartitionOffsetsHelperTool.GPT
{
internal class GPTUtils
{
internal static void MakeGPT(ulong DiskSize, ulong SectorSize, GPTPartition[] DefaultPartitionTable, ulong AndroidDesiredSpace = 4_294_967_296)
internal static byte[] MakeGPT(ulong DiskSize, ulong SectorSize, GPTPartition[] DefaultPartitionTable, Guid DiskGuid, bool IsBackupGPT = false, bool SplitInHalf = true, ulong AndroidDesiredSpace = 4_294_967_296)
{
ulong FirstLBA = 1;
ulong LastLBA = (DiskSize / SectorSize) - 1;

ulong PartitionArrayLBACount = 4;

if ((ulong)DefaultPartitionTable.Length * 128 > PartitionArrayLBACount * SectorSize)
{
throw new Exception("Unsupported Configuration, too many partitions to fit. File an issue");
}

ulong TotalGPTLBACount = 1 /* GPT Header */ + PartitionArrayLBACount /* Partition Table */;
ulong LastUsableLBA = LastLBA - TotalGPTLBACount;

Expand All @@ -22,10 +30,12 @@ internal static void MakeGPT(ulong DiskSize, ulong SectorSize, GPTPartition[] De
throw new Exception("ERROR");
}

InjectWindowsPartitions(Partitions, SectorSize, 4, AndroidDesiredSpace);
InjectWindowsPartitions(Partitions, SectorSize, 4, SplitInHalf, AndroidDesiredSpace);

return MakeGPT(FirstLBA, LastLBA, SectorSize, [.. Partitions], DiskGuid, PartitionArrayLBACount: PartitionArrayLBACount, IsBackupGPT: IsBackupGPT);
}

private static void InjectWindowsPartitions(List<GPTPartition> Partitions, ulong SectorSize, ulong BlockSize, ulong AndroidDesiredSpace)
private static void InjectWindowsPartitions(List<GPTPartition> Partitions, ulong SectorSize, ulong BlockSize, bool SplitInHalf, ulong AndroidDesiredSpace = 4_294_967_296)
{
ulong FirstUsableLBA = Partitions.Last().FirstLBA;
ulong LastUsableLBA = Partitions.Last().LastLBA;
Expand All @@ -45,18 +55,40 @@ private static void InjectWindowsPartitions(List<GPTPartition> Partitions, ulong
ESPLBACount += BlockSize - (ESPLBACount % BlockSize);
}

/* Strategy to reserve 4GB for Android Only */
ulong FourGigaBytes = AndroidDesiredSpace / SectorSize;
ulong WindowsLBACount = UsableLBACount - ESPLBACount - FourGigaBytes;
ulong WindowsLBACount;

if (WindowsLBACount < SixtyFourGigaBytes)
/* Strategy to reserve half for Android, half for Windows */
if (SplitInHalf)
{
WindowsLBACount = SixtyFourGigaBytes;
}
ulong AndroidOtherLUNLBAUsage = 8_679_372 /* Size taken in Android by another LUN that counts towards Android space utilization */;
WindowsLBACount = (UsableLBACount + AndroidOtherLUNLBAUsage - ESPLBACount) / 2;

if (WindowsLBACount < SixtyFourGigaBytes)
{
WindowsLBACount = SixtyFourGigaBytes;
}

if (WindowsLBACount % BlockSize != 0)
// In the case of the 4GB for Android strategy, we cannot do this or we risk to get userdata < 4GB
if (WindowsLBACount % BlockSize != 0)
{
WindowsLBACount += BlockSize - (WindowsLBACount % BlockSize);
}
}
/* Strategy to reserve 4GB for Android Only */
else
{
WindowsLBACount -= WindowsLBACount % BlockSize;
ulong FourGigaBytes = AndroidDesiredSpace / SectorSize;
WindowsLBACount = UsableLBACount - ESPLBACount - FourGigaBytes;

if (WindowsLBACount < SixtyFourGigaBytes)
{
WindowsLBACount = SixtyFourGigaBytes;
}

if (WindowsLBACount % BlockSize != 0)
{
WindowsLBACount -= WindowsLBACount % BlockSize;
}
}

ulong TotalInjectedLBACount = ESPLBACount + WindowsLBACount;
Expand Down Expand Up @@ -126,7 +158,9 @@ private static void InjectWindowsPartitions(List<GPTPartition> Partitions, ulong

Console.WriteLine("Resulting parted commands:");
Console.WriteLine();

Console.ForegroundColor = ConsoleColor.Green;

Console.WriteLine();
Console.WriteLine($"mkpart {Partitions[^3].Name} ext4 {Partitions[^3].FirstLBA}s {Partitions[^3].LastLBA}s");
Console.WriteLine();
Expand All @@ -135,7 +169,132 @@ private static void InjectWindowsPartitions(List<GPTPartition> Partitions, ulong
//Console.WriteLine($"mkpart {Partitions[^1].Name} ntfs {Partitions[^1].FirstLBA}s {Math.Truncate(Partitions[^1].LastLBA * SectorSize / (double)(1000 * 1000 * 1000))}GB");
Console.WriteLine($"mkpart {Partitions[^1].Name} ntfs {Partitions[^1].FirstLBA}s {Partitions[^1].LastLBA}s");
Console.WriteLine();

Console.ForegroundColor = ogColor;
}

private static byte[] MakeGPT(ulong FirstLBA, ulong LastLBA, ulong SectorSize, GPTPartition[] Partitions, Guid DiskGuid, ulong PartitionArrayLBACount = 4, bool IsBackupGPT = false)
{
// -------------------
// 0: Reserved/MBR
// -------------------
// 1: GPT Header
// -------------------
// 2: Partition Table
// 3: Partition Table
// 4: Partition Table
// 5: Partition Table
// -------------------
// 6: First Usable LBA
// ...
// -5: Last Usable LBA
// -------------------
// -4: Partition Table
// -3: Partition Table
// -2: Partition Table
// -1: Partition Table
// -------------------
// -0: Backup GPT Header
// -------------------

ulong TotalGPTLBACount = 1 /* GPT Header */ + PartitionArrayLBACount /* Partition Table */;

ulong FirstUsableLBA = FirstLBA + TotalGPTLBACount;
ulong LastUsableLBA = LastLBA - TotalGPTLBACount;

uint PartitionEntryCount;

if ((uint)Partitions.Length > 128)
{
throw new Exception("Unsupported Configuration, too many partitions than supported, please file an issue.");
}
else
{
PartitionEntryCount = (uint)Partitions.Length > 64 ? 128 : (uint)Partitions.Length > 32 ? 64 : (uint)32;
}

GPTHeader Header = new()
{
Signature = "EFI PART",
Revision = 0x10000,
Size = 92,
CRC32 = 0,
Reserved = 0,
CurrentLBA = IsBackupGPT ? LastLBA : FirstLBA,
BackupLBA = IsBackupGPT ? FirstLBA : LastLBA,
FirstUsableLBA = FirstUsableLBA,
LastUsableLBA = LastUsableLBA,
DiskGUID = DiskGuid,
PartitionArrayLBA = IsBackupGPT ? LastLBA - TotalGPTLBACount + 1 : FirstLBA + 1,
PartitionEntryCount = PartitionEntryCount,
PartitionEntrySize = 128,
PartitionArrayCRC32 = 0
};

List<byte> PartitionTableBuffer = [];
for (int i = 0; i < Partitions.Length; i++)
{
PartitionTableBuffer.AddRange(Partitions[i].TypeGUID.ToByteArray());
PartitionTableBuffer.AddRange(Partitions[i].UID.ToByteArray());
PartitionTableBuffer.AddRange(BitConverter.GetBytes(Partitions[i].FirstLBA));
PartitionTableBuffer.AddRange(BitConverter.GetBytes(Partitions[i].LastLBA));
PartitionTableBuffer.AddRange(BitConverter.GetBytes(Partitions[i].Attributes));
PartitionTableBuffer.AddRange(Encoding.Unicode.GetBytes(Partitions[i].Name));
PartitionTableBuffer.AddRange(new byte[(Header.PartitionEntrySize * (ulong)(long)(i + 1)) - (ulong)(long)PartitionTableBuffer.Count]);
}
PartitionTableBuffer.AddRange(new byte[(Header.PartitionEntrySize * Header.PartitionEntryCount) - (ulong)(long)PartitionTableBuffer.Count]);

uint PartitionTableCRC32 = CRC32.Compute([.. PartitionTableBuffer], 0, (uint)PartitionTableBuffer.Count);
Header.PartitionArrayCRC32 = PartitionTableCRC32;

byte[] HeaderBuffer =
[
.. Encoding.ASCII.GetBytes(Header.Signature),
.. BitConverter.GetBytes(Header.Revision),
.. BitConverter.GetBytes(Header.Size),
.. BitConverter.GetBytes(Header.CRC32),
.. BitConverter.GetBytes(Header.Reserved),
.. BitConverter.GetBytes(Header.CurrentLBA),
.. BitConverter.GetBytes(Header.BackupLBA),
.. BitConverter.GetBytes(Header.FirstUsableLBA),
.. BitConverter.GetBytes(Header.LastUsableLBA),
.. Header.DiskGUID.ToByteArray(),
.. BitConverter.GetBytes(Header.PartitionArrayLBA),
.. BitConverter.GetBytes(Header.PartitionEntryCount),
.. BitConverter.GetBytes(Header.PartitionEntrySize),
.. BitConverter.GetBytes(Header.PartitionArrayCRC32),
];

Header.CRC32 = CRC32.Compute(HeaderBuffer, 0, (uint)HeaderBuffer.Length);
byte[] bytes = BitConverter.GetBytes(Header.CRC32);

HeaderBuffer[16] = bytes[0];
HeaderBuffer[17] = bytes[1];
HeaderBuffer[18] = bytes[2];
HeaderBuffer[19] = bytes[3];

byte[] HeaderPaddingBuffer = new byte[(int)(SectorSize - (uint)HeaderBuffer.Length)];
byte[] PartitionTablePaddingBuffer = new byte[(int)((PartitionArrayLBACount * SectorSize) - (uint)PartitionTableBuffer.Count)];

List<byte> GPTBuffer = [];
if (IsBackupGPT)
{
GPTBuffer.AddRange(PartitionTableBuffer);
GPTBuffer.AddRange(PartitionTablePaddingBuffer);

GPTBuffer.AddRange(HeaderBuffer);
GPTBuffer.AddRange(HeaderPaddingBuffer);
}
else
{
GPTBuffer.AddRange(HeaderBuffer);
GPTBuffer.AddRange(HeaderPaddingBuffer);

GPTBuffer.AddRange(PartitionTableBuffer);
GPTBuffer.AddRange(PartitionTablePaddingBuffer);
}

return [.. GPTBuffer];
}
}
}
}
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