2.2.1.4.3 Device Read Request (DR_READ_REQ)
This header initiates a read request. This message can have different purposes depending on the device for which it is issued. The device type is determined by the DeviceId field in the DR_DEVICE_IOREQUEST header.
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DeviceIoRequest (24 bytes) |
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Padding (20 bytes) |
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DeviceIoRequest (24 bytes): A DR_DEVICE_IOREQUEST header. The MajorFunction field in this header MUST be set to IRP_MJ_READ.
Length (4 bytes): A 32-bit unsigned integer. This field specifies the maximum number of bytes to be read from the device.
Offset (8 bytes): A 64-bit unsigned integer. This field specifies the file offset where the read operation is performed.
Padding (20 bytes): An array of 20 bytes. Reserved. This field can be set to any value and MUST be ignored.