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Fixed reading the data within the block #70

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Fixed reading the data within the block #70

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8 changes: 6 additions & 2 deletions scsi/src/main/java/net/alphadev/usbstorage/bbb/BulkBlockDevice.java
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Original file line number Diff line number Diff line change
Expand Up @@ -189,8 +189,10 @@ public void read(long offsetBytes, ByteBuffer buffer) {
final int blocksPerTransfer = mMaxTransferSize / mBlockSize;

int offsetBlocks = (int) (offsetBytes / mBlockSize);
int blockOffset = (int) (offsetBytes % mBlockSize);
int blocksLeft = (short) Math.ceil((float) buffer.remaining() / mBlockSize);

boolean isFirstBlock = true;
while (blocksLeft > 0) {
final short requestedBlocks = (short) Math.min(blocksPerTransfer, blocksLeft);
final int requestedSize = requestedBlocks * mBlockSize;
Expand All @@ -205,8 +207,10 @@ public void read(long offsetBytes, ByteBuffer buffer) {
final byte[] buf = mAbstractBulkDevice.read(mBlockSize);

if (blocksLeft-- > 0) {
final int subLength = Math.min(mBlockSize, buffer.remaining());
buffer.put(buf, 0, subLength);
final int subLength = Math.min(mBlockSize - (isFirstBlock ? blockOffset : 0), buffer.remaining());
buffer.put(buf, (isFirstBlock ? blockOffset : 0), subLength);

isFirstBlock = false;
}
}

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