94 lines
2.8 KiB
C
94 lines
2.8 KiB
C
/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2010 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU 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 GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <grub/err.h>
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#include <grub/misc.h>
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#include <grub/mm.h>
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#include <grub/net/netbuff.h>
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grub_err_t grub_netbuff_put (struct grub_net_buff *net_buff ,grub_size_t len)
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{
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net_buff->tail += len;
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if (net_buff->tail > net_buff->end)
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return grub_error (GRUB_ERR_OUT_OF_RANGE, "put out of the packet range.");
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return GRUB_ERR_NONE;
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}
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grub_err_t grub_netbuff_unput (struct grub_net_buff *net_buff ,grub_size_t len)
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{
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net_buff->tail -= len;
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if (net_buff->tail < net_buff->head)
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return grub_error (GRUB_ERR_OUT_OF_RANGE, "unput out of the packet range.");
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return GRUB_ERR_NONE;
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}
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grub_err_t grub_netbuff_push (struct grub_net_buff *net_buff ,grub_size_t len)
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{
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net_buff->data -= len;
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if (net_buff->data < net_buff->head)
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return grub_error (GRUB_ERR_OUT_OF_RANGE, "push out of the packet range.");
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return GRUB_ERR_NONE;
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}
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grub_err_t grub_netbuff_pull (struct grub_net_buff *net_buff ,grub_size_t len)
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{
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net_buff->data += len;
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if (net_buff->data > net_buff->end)
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return grub_error (GRUB_ERR_OUT_OF_RANGE, "pull out of the packet range.");
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return GRUB_ERR_NONE;
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}
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grub_err_t grub_netbuff_reserve (struct grub_net_buff *net_buff ,grub_size_t len)
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{
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net_buff->data += len;
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net_buff->tail += len;
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if ((net_buff->tail > net_buff->end) || (net_buff->data > net_buff->end))
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return grub_error (GRUB_ERR_OUT_OF_RANGE, "reserve out of the packet range.");
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return GRUB_ERR_NONE;
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}
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struct grub_net_buff *grub_netbuff_alloc ( grub_size_t len )
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{
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struct grub_net_buff *nb;
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void *data;
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if (len < NETBUFFMINLEN)
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len = NETBUFFMINLEN;
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len = ALIGN_UP (len,NETBUFF_ALIGN);
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data = grub_memalign (NETBUFF_ALIGN, len + sizeof (*nb));
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nb = (struct grub_net_buff *) ((grub_uint8_t *) data + len);
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nb->head = nb->data = nb->tail = data;
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nb->end = (char *) nb;
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return nb;
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}
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grub_err_t grub_netbuff_free (struct grub_net_buff *net_buff)
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{
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grub_free (net_buff->head);
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return 0;
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}
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grub_err_t grub_netbuff_clear (struct grub_net_buff *net_buff)
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{
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net_buff->data = net_buff->tail = net_buff->head;
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return 0;
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}
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