8406115834
Access to the gpxe.org and etherboot.org domains and associated resources has been revoked by the registrant of the domain. Work around this problem by renaming project from gPXE to iPXE, and updating URLs to match. Also update README, LOG and COPYRIGHTS to remove obsolete information. Signed-off-by: Michael Brown <mcb30@ipxe.org>
69 lines
1.9 KiB
C
69 lines
1.9 KiB
C
/*
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* Copyright (C) 2007 Michael Brown <mbrown@fensystems.co.uk>.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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FILE_LICENCE ( GPL2_OR_LATER );
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/**
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* @file
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*
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* I/O buffer padding
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*
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*/
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#include <string.h>
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#include <ipxe/iobuf.h>
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/**
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* Pad I/O buffer
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*
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* @v iobuf I/O buffer
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* @v min_len Minimum length
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*
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* This function pads and aligns I/O buffers, for devices that
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* aren't capable of padding in hardware, or that require specific
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* alignment in TX buffers. The packet data will end up aligned to a
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* multiple of @c IOB_ALIGN.
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*
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* @c min_len must not exceed @v IOB_ZLEN.
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*/
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void iob_pad ( struct io_buffer *iobuf, size_t min_len ) {
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void *data;
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size_t len;
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size_t headroom;
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signed int pad_len;
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assert ( min_len <= IOB_ZLEN );
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/* Move packet data to start of I/O buffer. This will both
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* align the data (since I/O buffers are aligned to
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* IOB_ALIGN) and give us sufficient space for the
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* zero-padding
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*/
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data = iobuf->data;
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len = iob_len ( iobuf );
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headroom = iob_headroom ( iobuf );
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iob_push ( iobuf, headroom );
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memmove ( iobuf->data, data, len );
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iob_unput ( iobuf, headroom );
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/* Pad to minimum packet length */
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pad_len = ( min_len - iob_len ( iobuf ) );
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if ( pad_len > 0 )
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memset ( iob_put ( iobuf, pad_len ), 0, pad_len );
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}
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