2 This file is part of PulseAudio.
4 Copyright 2004-2006 Lennart Poettering
6 PulseAudio is free software; you can redistribute it and/or modify
7 it under the terms of the GNU Lesser General Public License as
8 published by the Free Software Foundation; either version 2.1 of the
9 License, or (at your option) any later version.
11 PulseAudio is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public
17 License along with PulseAudio; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
31 #include <pulse/xmalloc.h>
32 #include <pulsecore/macro.h>
33 #include <pulsecore/core-util.h>
37 pa_memchunk* pa_memchunk_make_writable(pa_memchunk *c, size_t min) {
43 pa_assert(c->memblock);
45 if (pa_memblock_ref_is_one(c->memblock) &&
46 !pa_memblock_is_read_only(c->memblock) &&
47 pa_memblock_get_length(c->memblock) >= c->index+min)
50 l = PA_MAX(c->length, min);
52 n = pa_memblock_new(pa_memblock_get_pool(c->memblock), l);
54 sdata = pa_memblock_acquire(c->memblock);
55 tdata = pa_memblock_acquire(n);
57 memcpy(tdata, (uint8_t*) sdata + c->index, c->length);
59 pa_memblock_release(c->memblock);
60 pa_memblock_release(n);
62 pa_memblock_unref(c->memblock);
70 pa_memchunk* pa_memchunk_reset(pa_memchunk *c) {
73 memset(c, 0, sizeof(*c));
78 pa_memchunk *pa_memchunk_will_need(const pa_memchunk *c) {
82 pa_assert(c->memblock);
84 /* A version of pa_memblock_will_need() that works on memchunks
85 * instead of memblocks */
87 p = (uint8_t*) pa_memblock_acquire(c->memblock) + c->index;
88 pa_will_need(p, c->length);
89 pa_memblock_release(c->memblock);
91 return (pa_memchunk*) c;
94 pa_memchunk* pa_memchunk_memcpy(pa_memchunk *dst, pa_memchunk *src) {
99 pa_assert(dst->length == src->length);
101 p = pa_memblock_acquire(dst->memblock);
102 q = pa_memblock_acquire(src->memblock);
104 memmove((uint8_t*) p + dst->index,
105 (uint8_t*) q + src->index,
108 pa_memblock_release(dst->memblock);
109 pa_memblock_release(src->memblock);