mirror of
https://github.com/aaru-dps/Aaru.git
synced 2025-12-16 19:24:25 +00:00
202 lines
8.6 KiB
C#
202 lines
8.6 KiB
C#
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using System;
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using System.IO;
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using System.Text;
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using System.Collections.Generic;
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using FileSystemIDandChk;
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namespace FileSystemIDandChk.PartPlugins
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{
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class AppleMap : PartPlugin
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{
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public AppleMap (PluginBase Core)
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{
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base.Name = "Apple Partition Map";
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base.PluginUUID = new Guid("ffe4b4e9-82ed-4761-af49-8bade4081d10");
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}
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public override bool GetInformation (FileStream stream, out List<Partition> partitions)
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{
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byte[] sixteen_bits = new byte[2];
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byte[] thirtytwo_bits = new byte[4];
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byte[] sixteen_bytes = new byte[16];
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byte[] thirtytwo_bytes = new byte[32];
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ulong apm_entries;
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partitions = new List<Partition>();
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AppleMapBootEntry APMB = new AppleMapBootEntry();
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AppleMapPartitionEntry APMEntry = new AppleMapPartitionEntry();
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stream.Seek(0, SeekOrigin.Begin);
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stream.Read(sixteen_bits, 0, 2);
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sixteen_bits = Swapping.SwapTwoBytes(sixteen_bits);
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APMB.signature = BitConverter.ToUInt16(sixteen_bits, 0);
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if(APMB.signature != 0x4552)
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return false; // Not an Apple Partition Map
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stream.Read(sixteen_bits, 0, 2);
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sixteen_bits = Swapping.SwapTwoBytes(sixteen_bits);
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APMB.sector_size = BitConverter.ToUInt16(sixteen_bits, 0);
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stream.Seek(APMB.sector_size, SeekOrigin.Begin); // Seek to first entry
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stream.Read(sixteen_bits, 0, 2);
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sixteen_bits = Swapping.SwapTwoBytes(sixteen_bits);
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APMEntry.signature = BitConverter.ToUInt16(sixteen_bits, 0);
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if(APMEntry.signature != 0x504D && APMEntry.signature != 0x5453) // It should have partition entry signature
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return false;
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stream.Seek(2, SeekOrigin.Current); // Skip reserved1
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stream.Read(thirtytwo_bits, 0, 4);
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thirtytwo_bits = Swapping.SwapFourBytes(thirtytwo_bits);
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APMEntry.entries = BitConverter.ToUInt32(thirtytwo_bits, 0);
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if(APMEntry.entries <= 1) // It should have more than one entry
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return false;
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stream.Seek(4, SeekOrigin.Current); // Skip start, we don't need it
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stream.Seek(4, SeekOrigin.Current); // Skip sectors, we don't need it
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stream.Seek(32, SeekOrigin.Current); // Skip name, we don't ned it
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stream.Read(thirtytwo_bytes, 0, 32);
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APMEntry.type = StringHandlers.CToString(thirtytwo_bytes);
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if(APMEntry.type != "Apple_partition_map") // APM self-describes, if not, this is incorrect
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return false;
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apm_entries = APMEntry.entries;
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for(ulong i = 2; i <= apm_entries; i++) // For each partition
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{
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APMEntry = new AppleMapPartitionEntry();
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stream.Seek((long)(APMB.sector_size*i), SeekOrigin.Begin); // Seek to partition descriptor
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stream.Read(sixteen_bits, 0, 2);
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sixteen_bits = Swapping.SwapTwoBytes(sixteen_bits);
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APMEntry.signature = BitConverter.ToUInt16(sixteen_bits, 0);
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if(APMEntry.signature == 0x504D || APMEntry.signature == 0x5453) // It should have partition entry signature
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{
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Partition _partition = new Partition();
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StringBuilder sb = new StringBuilder();
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stream.Seek(2, SeekOrigin.Current); // Skip reserved1
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stream.Seek(4, SeekOrigin.Current); // Skip entries
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stream.Read(thirtytwo_bits, 0, 4);
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thirtytwo_bits = Swapping.SwapFourBytes(thirtytwo_bits);
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APMEntry.start = BitConverter.ToUInt32(thirtytwo_bits, 0);
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stream.Read(thirtytwo_bits, 0, 4);
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thirtytwo_bits = Swapping.SwapFourBytes(thirtytwo_bits);
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APMEntry.sectors = BitConverter.ToUInt32(thirtytwo_bits, 0);
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stream.Read(thirtytwo_bytes, 0, 32);
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APMEntry.name = StringHandlers.CToString(thirtytwo_bytes);
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stream.Read(thirtytwo_bytes, 0, 32);
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APMEntry.type = StringHandlers.CToString(thirtytwo_bytes);
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stream.Read(thirtytwo_bits, 0, 4);
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thirtytwo_bits = Swapping.SwapFourBytes(thirtytwo_bits);
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APMEntry.first_data_block = BitConverter.ToUInt32(thirtytwo_bits, 0);
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stream.Read(thirtytwo_bits, 0, 4);
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thirtytwo_bits = Swapping.SwapFourBytes(thirtytwo_bits);
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APMEntry.data_sectors = BitConverter.ToUInt32(thirtytwo_bits, 0);
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stream.Read(thirtytwo_bits, 0, 4);
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thirtytwo_bits = Swapping.SwapFourBytes(thirtytwo_bits);
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APMEntry.status = BitConverter.ToUInt32(thirtytwo_bits, 0);
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stream.Read(thirtytwo_bits, 0, 4);
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thirtytwo_bits = Swapping.SwapFourBytes(thirtytwo_bits);
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APMEntry.first_boot_block = BitConverter.ToUInt32(thirtytwo_bits, 0);
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stream.Read(thirtytwo_bits, 0, 4);
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thirtytwo_bits = Swapping.SwapFourBytes(thirtytwo_bits);
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APMEntry.boot_size = BitConverter.ToUInt32(thirtytwo_bits, 0);
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stream.Read(thirtytwo_bits, 0, 4);
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thirtytwo_bits = Swapping.SwapFourBytes(thirtytwo_bits);
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APMEntry.load_address = BitConverter.ToUInt32(thirtytwo_bits, 0);
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stream.Seek(4, SeekOrigin.Current);
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stream.Read(thirtytwo_bits, 0, 4);
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thirtytwo_bits = Swapping.SwapFourBytes(thirtytwo_bits);
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APMEntry.entry_point = BitConverter.ToUInt32(thirtytwo_bits, 0);
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stream.Seek(4, SeekOrigin.Current);
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stream.Read(thirtytwo_bits, 0, 4);
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thirtytwo_bits = Swapping.SwapFourBytes(thirtytwo_bits);
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APMEntry.checksum = BitConverter.ToUInt32(thirtytwo_bits, 0);
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stream.Read(sixteen_bytes, 0, 16);
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APMEntry.processor = StringHandlers.CToString(sixteen_bytes);
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_partition.PartitionSequence = i;
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_partition.PartitionType = APMEntry.type;
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_partition.PartitionName = APMEntry.name;
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_partition.PartitionStart = APMEntry.start * APMB.sector_size;
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_partition.PartitionLength = APMEntry.sectors * APMB.sector_size;
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sb.AppendLine("Partition flags:");
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if((APMEntry.status & 0x01) == 0x01)
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sb.AppendLine("Partition is valid.");
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if((APMEntry.status & 0x02) == 0x02)
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sb.AppendLine("Partition entry is not available.");
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if((APMEntry.status & 0x04) == 0x04)
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sb.AppendLine("Partition is mounted.");
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if((APMEntry.status & 0x08) == 0x08)
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sb.AppendLine("Partition is bootable.");
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if((APMEntry.status & 0x10) == 0x10)
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sb.AppendLine("Partition is readable.");
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if((APMEntry.status & 0x20) == 0x20)
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sb.AppendLine("Partition is writable.");
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if((APMEntry.status & 0x40) == 0x40)
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sb.AppendLine("Partition's boot code is position independent.");
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if((APMEntry.status & 0x08) == 0x08)
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{
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sb.AppendFormat("First boot sector: {0}", APMEntry.first_boot_block).AppendLine();
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sb.AppendFormat("Boot is {0} bytes.", APMEntry.boot_size).AppendLine();
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sb.AppendFormat("Boot load address: 0x{0:X8}", APMEntry.load_address).AppendLine();
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sb.AppendFormat("Boot entry point: 0x{0:X8}", APMEntry.entry_point).AppendLine();
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sb.AppendFormat("Boot code checksum: 0x{0:X8}", APMEntry.checksum).AppendLine();
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sb.AppendFormat("Processor: {0}", APMEntry.processor).AppendLine();
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}
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_partition.PartitionDescription = sb.ToString();
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if((APMEntry.status & 0x01) == 0x01)
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partitions.Add(_partition);
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}
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}
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return true;
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}
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public struct AppleMapBootEntry
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{
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public UInt16 signature; // Signature ("ER")
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public UInt16 sector_size; // Byter per sector
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public UInt32 sectors; // Sectors of the disk
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public UInt16 reserved1; // Reserved
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public UInt16 reserved2; // Reserved
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public UInt32 reserved3; // Reserved
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public UInt16 driver_entries; // Number of entries of the driver descriptor
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public UInt32 first_driver_blk; // First sector of the driver
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public UInt16 driver_size; // Size in 512bytes sectors of the driver
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public UInt16 operating_system; // Operating system (MacOS = 1)
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}
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public struct AppleMapPartitionEntry
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{
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public UInt16 signature; // Signature ("PM" or "TS")
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public UInt16 reserved1; // Reserved
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public UInt32 entries; // Number of entries on the partition map, each one sector
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public UInt32 start; // First sector of the partition
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public UInt32 sectors; // Number of sectos of the partition
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public string name; // Partition name, 32 bytes, null-padded
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public string type; // Partition type. 32 bytes, null-padded
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public UInt32 first_data_block; // First sector of the data area
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public UInt32 data_sectors; // Number of sectors of the data area
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public UInt32 status; // Partition status
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public UInt32 first_boot_block; // First sector of the boot code
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public UInt32 boot_size; // Size in bytes of the boot code
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public UInt32 load_address; // Load address of the boot code
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public UInt32 reserved2; // Reserved
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public UInt32 entry_point; // Entry point of the boot code
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public UInt32 reserved3; // Reserved
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public UInt32 checksum; // Boot code checksum
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public string processor; // Processor type, 16 bytes, null-padded
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}
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}
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}
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