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/* |
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* ircd-hybrid: an advanced Internet Relay Chat Daemon(ircd). |
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* dbuf.c: Supports dynamic data buffers. |
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* |
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* Copyright (C) 2002 by the past and present ircd coders, and others. |
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* |
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* This program 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 2 of the License, or |
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* (at your option) any later version. |
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* |
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* This program 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 this program; if not, write to the Free Software |
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 |
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* USA |
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* |
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* $Id$ |
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*/ |
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|
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#include "stdinc.h" |
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#include "list.h" |
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#include "balloc.h" |
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#include "dbuf.h" |
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#include "memory.h" |
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|
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static BlockHeap *dbuf_heap; |
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|
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void |
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dbuf_init(void) |
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{ |
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dbuf_heap = BlockHeapCreate("dbuf", sizeof(struct dbuf_block), DBUF_HEAP_SIZE); |
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} |
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|
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static struct dbuf_block * |
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dbuf_alloc(struct dbuf_queue *qptr) |
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{ |
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struct dbuf_block *block = BlockHeapAlloc(dbuf_heap); |
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|
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dlinkAddTail(block, make_dlink_node(), &qptr->blocks); |
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return block; |
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} |
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|
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void |
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dbuf_put(struct dbuf_queue *qptr, char *data, size_t count) |
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{ |
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struct dbuf_block *last; |
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size_t amount; |
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|
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assert(count > 0); |
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if (qptr->blocks.tail == NULL) |
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dbuf_alloc(qptr); |
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|
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do { |
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last = qptr->blocks.tail->data; |
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|
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amount = DBUF_BLOCK_SIZE - last->size; |
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if (!amount) |
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{ |
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last = dbuf_alloc(qptr); |
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amount = DBUF_BLOCK_SIZE; |
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} |
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if (amount > count) |
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amount = count; |
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|
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memcpy((void *) &last->data[last->size], data, amount); |
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count -= amount; |
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last->size += amount; |
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qptr->total_size += amount; |
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|
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data += amount; |
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|
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} while (count > 0); |
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} |
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|
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void |
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dbuf_delete(struct dbuf_queue *qptr, size_t count) |
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{ |
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dlink_node *ptr; |
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struct dbuf_block *first; |
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|
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assert(qptr->total_size >= count); |
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if (count == 0) |
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return; |
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|
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/* free whole blocks first.. */ |
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while (1) |
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{ |
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if (!count) |
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return; |
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ptr = qptr->blocks.head; |
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first = ptr->data; |
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if (count < first->size) |
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break; |
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|
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qptr->total_size -= first->size; |
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count -= first->size; |
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dlinkDelete(ptr, &qptr->blocks); |
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free_dlink_node(ptr); |
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BlockHeapFree(dbuf_heap, first); |
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} |
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|
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/* ..then remove data from the beginning of the queue */ |
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first->size -= count; |
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qptr->total_size -= count; |
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memmove((void *) &first->data, (void *) &first->data[count], first->size); |
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} |
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|
