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Merge pull request #381 from magnusja/develop
core v0.10.0 libusbcommunication v0.4.0
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70 changes: 70 additions & 0 deletions
70
libaums/src/main/java/com/github/mjdev/libaums/partition/gpt/GPT.kt
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package com.github.mjdev.libaums.partition.gpt | ||
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import android.util.Log | ||
import me.jahnen.libaums.core.driver.BlockDeviceDriver | ||
import me.jahnen.libaums.core.partition.PartitionTable | ||
import me.jahnen.libaums.core.partition.PartitionTableEntry | ||
import java.io.IOException | ||
import java.nio.ByteBuffer | ||
import java.nio.ByteOrder | ||
import java.util.ArrayList | ||
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class GPT private constructor(): PartitionTable { | ||
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// See also https://en.wikipedia.org/wiki/GUID_Partition_Table | ||
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private val partitions = ArrayList<PartitionTableEntry>() | ||
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override val size: Int get() = partitions.size * 128 | ||
override val partitionTableEntries: List<PartitionTableEntry> | ||
get() = partitions | ||
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companion object { | ||
private val TAG = GPT::class.java.simpleName | ||
const val EFI_PART = "EFI PART" | ||
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const val GPT_OFFSET = 512 // GPT has a protective MBR, GPT starts after | ||
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const val ENTRY_SIZE = 128 | ||
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const val FIRST_LBA_OFFSET = 32 | ||
const val LAST_LBA_OFFSET = 40 | ||
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@Throws(IOException::class) | ||
fun read(blockDevice: BlockDeviceDriver): GPT? { | ||
val result = GPT() | ||
var buffer = ByteBuffer.allocate(512 * 2) | ||
blockDevice.read(0, buffer) | ||
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val efiTestString = String(buffer.array(), GPT_OFFSET, 8, Charsets.US_ASCII) | ||
Log.d(TAG, "EFI test string $efiTestString") | ||
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if (efiTestString != EFI_PART) { | ||
return null | ||
} | ||
Log.d(TAG, "EFI test string matches!") | ||
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buffer = ByteBuffer.allocate(512 * 34) // at LBA 34 GPT should stop | ||
blockDevice.read(0, buffer) | ||
buffer.order(ByteOrder.LITTLE_ENDIAN) | ||
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var entry_offset = 1024 | ||
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while (buffer[entry_offset].toInt() != 0) { | ||
val firstLba = buffer.getLong(entry_offset + FIRST_LBA_OFFSET) | ||
val entry = PartitionTableEntry(-1, // Unknown | ||
firstLba, | ||
buffer.getLong(entry_offset + LAST_LBA_OFFSET) - firstLba) | ||
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result.partitions.add(entry) | ||
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entry_offset += ENTRY_SIZE | ||
} | ||
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return result | ||
} | ||
} | ||
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} |
10 changes: 10 additions & 0 deletions
10
libaums/src/main/java/com/github/mjdev/libaums/partition/gpt/GPTCreator.kt
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package com.github.mjdev.libaums.partition.gpt | ||
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import me.jahnen.libaums.core.driver.BlockDeviceDriver | ||
import me.jahnen.libaums.core.partition.PartitionTable | ||
import me.jahnen.libaums.core.partition.PartitionTableFactory | ||
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class GPTCreator: PartitionTableFactory.PartitionTableCreator { | ||
override fun read(blockDevice: BlockDeviceDriver): PartitionTable? = GPT.read(blockDevice) | ||
} |
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