The input maxsize is written to outbuf+0. The total amount of data written to the output starting at offset 0x0, is written to outbuf+4. Outbuf+8 is zero when the buffer contains no actual received data, 1 otherwise. Therefore, when the output contains no actual received data the size value at outbuf+4 is set to 0xC.
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The following is the structure of the data at outbuf+0xC. The data starting at +0x1C is the data from the entire raw beacon data, starting at the 802.11 management frame header. It's unknown what exactly the data prior to that is.