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* See LICENSE.md for licensing information.

* Based on libusb <http://libusb.info/>:

package org.usb4java;

import java.nio.ByteBuffer;

import java.nio.ByteOrder;

/**

* Setup packet for control transfers.

* @author Luca Longinotti (l@longi.li)

public final class ControlSetup

{

/**

* The native data structure of the setup packet.

* USB Control Setup is always 8 bytes long. Structured as follows:

* byte 0: bmRequestType

* byte 1: bRequest

* bytes 2-3: wValue (Little Endian)

* bytes 4-5: wIndex (Little Endian)

* bytes 6-7: wLength (Little Endian)

private final ByteBuffer controlSetup;

/**

* Constructs a new control setup packet using the first 8 bytes from the

* specified transfer buffer.

* @param buffer

* The transfer buffer.

ControlSetup(final ByteBuffer buffer)

{

if (buffer == null)

{

throw new IllegalArgumentException("buffer cannot be null");

}

this.controlSetup = BufferUtils.slice(buffer, 0,

LibUsb.CONTROL_SETUP_SIZE);

// Control Setup (as all of USB) is Little Endian.

this.controlSetup.order(ByteOrder.LITTLE_ENDIAN);

}

/**

* Returns the request type.

* Bits 0:4 determine recipient.

* Bits 5:6 determine type.

* Bit 7 determines data transfer direction.

* @return The request type.

public byte bmRequestType()

{

return this.controlSetup.get(0);

}

/**

* Sets the request type.

* @param bmRequestType

* The request type to set.

public void setBmRequestType(final byte bmRequestType)

{

this.controlSetup.put(0, bmRequestType);

}

/**

* Returns the request.

* If the type bits of {@link #bmRequestType()} are equal to

* {@link LibUsb#REQUEST_TYPE_STANDARD} then this field refers to

* one of the REQUEST_* constants or {@link LibUsb#SET_ISOCH_DELAY}. For

* other cases, use of this field is application-specific.

* @return The request.

public byte bRequest()

{

return this.controlSetup.get(1);

}

/**

* Sets the request.

* @param bRequest

* The request to set.

public void setBRequest(final byte bRequest)

{

this.controlSetup.put(1, bRequest);

}

/**

* Returns the value.

* Varies according to request

* @return The value.

public short wValue()

{

return this.controlSetup.getShort(2);

}

/**

* Sets the value.

* @param wValue

* The value to set.

public void setWValue(final short wValue)

{

this.controlSetup.putShort(2, wValue);

}

/**

* Returns the index.

* Varies according to request, typically used to pass an index or offset

* @return The index.

public short wIndex()

{

return this.controlSetup.getShort(4);

}

/**

* Sets the index.

* @param wIndex

* The index to set.

public void setWIndex(final short wIndex)

{

this.controlSetup.putShort(4, wIndex);

}

/**

* Returns the number of bytes to transfer.

* @return The number of bytes to transfer.

public short wLength()

{

return this.controlSetup.getShort(6);

}

/**

* Sets the number of bytes to transfer.

* @param wLength

* The number of bytes to transfer.

public void setWLength(final short wLength)

{

this.controlSetup.putShort(6, wLength);

}

@Override

public int hashCode()

{

final int prime = 31;

int result = 1;

result = (prime * result)

+ ((this.controlSetup == null) ? 0 : this.controlSetup.hashCode());

return result;

}

@Override

public boolean equals(final Object obj)

{

if (this == obj)

{

return true;

}

if (obj == null)

{

return false;

}

if (this.getClass() != obj.getClass())

{

return false;

}

final ControlSetup other = (ControlSetup) obj;

if (this.controlSetup == null)

{

if (other.controlSetup != null)

{

return false;

}

else if (!this.controlSetup.equals(other.controlSetup))

{

return false;

}

return true;

}

@Override

public String toString()

{

return String.format("libusb control setup with buffer %s",

this.controlSetup.toString());

}

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