5b82ffc291
After we've been hit by Large File Support problems several times in the past week (which only occur on 32 bit platforms, which I don't have), this is yet another attempt to fix the issue.
90 lines
1.8 KiB
C
90 lines
1.8 KiB
C
/*
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* Copyright (C) 2003-2009 The Music Player Daemon Project
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* http://www.musicpd.org
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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 along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#include "page.h"
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#include <glib.h>
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#include <assert.h>
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#include <string.h>
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/**
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* Allocates a new #page object, without filling the data element.
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*/
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static struct page *
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page_new(size_t size)
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{
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struct page *page = g_malloc(sizeof(*page) + size -
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sizeof(page->data));
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assert(size > 0);
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page->ref = 1;
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page->size = size;
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return page;
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}
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struct page *
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page_new_copy(const void *data, size_t size)
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{
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struct page *page = page_new(size);
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assert(data != NULL);
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memcpy(page->data, data, size);
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return page;
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}
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struct page *
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page_new_concat(const struct page *a, const struct page *b)
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{
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struct page *page = page_new(a->size + b->size);
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memcpy(page->data, a->data, a->size);
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memcpy(page->data + a->size, b->data, b->size);
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return page;
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}
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void
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page_ref(struct page *page)
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{
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g_atomic_int_inc(&page->ref);
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}
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static void
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page_free(struct page *page)
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{
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assert(page->ref == 0);
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g_free(page);
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}
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bool
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page_unref(struct page *page)
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{
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bool unused = g_atomic_int_dec_and_test(&page->ref);
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if (unused)
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page_free(page);
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return unused;
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}
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