Add test for BlockDeviceOutputStream and fix bugs found testing
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2 changed files with 191 additions and 14 deletions
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@ -7,7 +7,7 @@ import java.nio.ByteBuffer
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class BlockDeviceOutputStream(
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private val blockDev: BlockDeviceDriver,
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bufferBlocks: Int = 2048
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private val bufferBlocks: Int = 2048
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) : OutputStream() {
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private val byteBuffer = ByteBuffer.allocate(blockDev.blockSize * bufferBlocks)
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@ -16,15 +16,14 @@ class BlockDeviceOutputStream(
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private val currentByteOffset: Long
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get() = currentBlockOffset * blockDev.blockSize + byteBuffer.position()
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private val sizeBytes: Long
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get() = blockDev.size.toLong() * blockDev.blockSize
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private val bytesUntilEOF: Long
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get() = blockDev.size.toLong() * blockDev.size - currentByteOffset
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get() = blockDev.size.toLong() * blockDev.blockSize - currentByteOffset
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override fun write(b: Int) {
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if (bytesUntilEOF < 1)
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if (bytesUntilEOF < 1) {
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flush()
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throw IOException("No space left on device")
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}
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byteBuffer.put(b.toByte())
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@ -37,7 +36,7 @@ class BlockDeviceOutputStream(
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}
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override fun write(b: ByteArray, off: Int, len: Int) {
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val maxPos = (off + len) % (b.size + 1)
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val maxPos = Math.min(off + len, b.size)
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if (len <= 0 || off > b.size)
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return
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@ -61,12 +60,16 @@ class BlockDeviceOutputStream(
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blockDev.read(currentBlockOffset + fullBlocks, incompleteBlockBuffer)
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// Add it to the incomplete block
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byteBuffer.limit(fullBlocks * blockDev.blockSize)
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byteBuffer.put(
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incompleteBlockBuffer.array(),
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toWrite, blockDev.blockSize - incompleteBlockFullBytes
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)
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byteBuffer.position(0)
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byteBuffer.apply {
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position(toWrite)
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limit((fullBlocks + 1) * blockDev.blockSize)
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put(
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incompleteBlockBuffer.array(),
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incompleteBlockFullBytes,
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blockDev.blockSize - incompleteBlockFullBytes
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)
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position(0)
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}
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}
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// Flush to device
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@ -80,6 +83,13 @@ class BlockDeviceOutputStream(
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clear()
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position(incompleteBlockFullBytes)
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}
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currentBlockOffset += fullBlocks;
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// Ensure the buffer is limited on EOF
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if (blockDev.size - currentBlockOffset < bufferBlocks)
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byteBuffer.limit(
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(blockDev.size - currentBlockOffset).toInt() * blockDev.blockSize
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)
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currentBlockOffset += fullBlocks
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}
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}
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@ -0,0 +1,167 @@
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package eu.depau.etchdroid.utils.blockdevice
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import com.github.mjdev.libaums.driver.BlockDeviceDriver
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import com.github.mjdev.libaums.driver.file.FileBlockDeviceDriver
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import org.junit.Assert
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import org.junit.Test
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import java.io.File
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import java.io.IOException
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import java.io.RandomAccessFile
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class BlockDeviceOutputStreamTest {
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@Test
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fun testWithCommonParams() {
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runWriteTest(
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10L * 1024 * 1024, // 10 MiB
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512,
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2048
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)
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}
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@Test
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fun testWithWeirdBlockSize() {
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runWriteTest(
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10L * 666 * 2 * 666 * 2, // 10 MegaDevils
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666,
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2048
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)
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}
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@Test
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fun testUnbuffered() {
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runWriteTest(
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10L * 1024 * 1024, // 10 MiB
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512,
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1
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)
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}
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fun runWriteTest(testDevSize: Long, testBlockSize: Int, testBufferBlocks: Int) {
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val testFile = createTestFile(testDevSize)
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try {
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val testDev = createTestBlockDevice(testFile, testBlockSize)
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val outputStream = BlockDeviceOutputStream(testDev, bufferBlocks = testBufferBlocks)
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val deviceRandomAccessFile: RandomAccessFile = testDev::class.java
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.getDeclaredField("file")
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.apply { isAccessible = true }
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.get(testDev) as RandomAccessFile
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var byteArray: ByteArray
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// Write some bytes
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outputStream.write(0)
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outputStream.write(1)
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outputStream.write(2)
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outputStream.write(3)
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outputStream.flush()
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deviceRandomAccessFile.fd.sync()
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byteArray = ByteArray(8)
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RandomAccessFile(testFile, "r").use {
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it.read(byteArray)
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}
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Assert.assertArrayEquals(
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byteArrayOf(
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0, 1, 2, 3, 0xFA.toByte(), 0xF9.toByte(), 0xF8.toByte(), 0xF7.toByte()
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),
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byteArray
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)
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// Fill current block
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byteArray = ByteArray(testBlockSize - 4)
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outputStream.write(byteArray)
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outputStream.flush()
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deviceRandomAccessFile.fd.sync()
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byteArray = ByteArray(testBlockSize + 8)
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RandomAccessFile(testFile, "r").use {
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it.read(byteArray)
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}
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Assert.assertArrayEquals(
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byteArrayOf(
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0, 1, 2, 3
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),
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byteArray.copyOfRange(0, 4)
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)
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Assert.assertArrayEquals(
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(4 until testBlockSize).map { 0.toByte() }.toByteArray(),
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byteArray.copyOfRange(4, testBlockSize)
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)
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Assert.assertArrayEquals(
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(testBlockSize until testBlockSize + 8).map { (0xFE - it % 0xFF).toByte() }.toByteArray(),
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byteArray.copyOfRange(testBlockSize, testBlockSize + 8)
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)
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// Fill the buffer except for the last 8 bytes
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// Note that flush successfully wrote one full block, so the block offset is now 1
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byteArray = ByteArray(testBufferBlocks * testBlockSize - 8)
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outputStream.write(byteArray)
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// Now do a write that goes out of the buffer
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byteArray = (0 until 16).map { 42.toByte() }.toByteArray()
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outputStream.write(byteArray)
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outputStream.flush()
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deviceRandomAccessFile.fd.sync()
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val fullBufferOffset = (testBufferBlocks + 1) * testBlockSize
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val byteArray1 = ByteArray(20)
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RandomAccessFile(testFile, "r").use {
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it.seek(fullBufferOffset - 8L)
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it.read(byteArray1)
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}
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Assert.assertArrayEquals(
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byteArray,
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byteArray1.copyOfRange(0, 16)
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)
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Assert.assertArrayEquals(
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(fullBufferOffset + 8 until fullBufferOffset + 12)
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.map { (0xFE - it % 0xFF).toByte() }
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.toByteArray(),
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byteArray1.copyOfRange(16, 20)
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)
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// Go to end of file - 4 bytes
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val remainingBytes = testDevSize - (fullBufferOffset + 8)
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byteArray = ByteArray(remainingBytes.toInt() - 4)
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outputStream.write(byteArray)
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// This should work
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byteArray = ByteArray(4)
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outputStream.write(byteArray)
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// This should not
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try {
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outputStream.write(0)
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Assert.fail("Did not throw exception on EOF")
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} catch (e: IOException) {
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Assert.assertEquals("No space left on device", e.message)
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}
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} finally {
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testFile.delete()
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}
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}
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companion object {
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fun createTestFile(size: Long): File {
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val file = File.createTempFile("etchdroid-test-", ".img")
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val fileOutputStream = file.outputStream()
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// Writes 0xFE, 0xFD, ..., 0x00
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for (i in 0..size)
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fileOutputStream.write(0xFE - i.toInt() % 0xFF)
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fileOutputStream.flush()
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file.deleteOnExit()
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return file
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}
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fun createTestBlockDevice(file: File, blockSize: Int): BlockDeviceDriver =
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FileBlockDeviceDriver(file, blockSize, 0)
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}
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}
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