1/***
2  This file is part of PulseAudio.
3
4  Copyright 2004-2006 Lennart Poettering
5
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.
10
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.
15
16  You should have received a copy of the GNU Lesser General Public
17  License along with PulseAudio; if not, see <http://www.gnu.org/licenses/>.
18***/
19
20#ifdef HAVE_CONFIG_H
21#include <config.h>
22#endif
23
24#include <stdio.h>
25#include <stdlib.h>
26#include <string.h>
27#include <errno.h>
28
29#include <pulsecore/macro.h>
30#include <pulsecore/core-util.h>
31
32#include "memchunk.h"
33
34pa_memchunk* pa_memchunk_make_writable(pa_memchunk *c, size_t min) {
35    pa_mempool *pool;
36    pa_memblock *n;
37    size_t l;
38    void *tdata, *sdata;
39
40    pa_assert(c);
41    pa_assert(c->memblock);
42
43    if (pa_memblock_ref_is_one(c->memblock) &&
44        !pa_memblock_is_read_only(c->memblock) &&
45        pa_memblock_get_length(c->memblock) >= c->index+min)
46        return c;
47
48    l = PA_MAX(c->length, min);
49
50    pool = pa_memblock_get_pool(c->memblock);
51    n = pa_memblock_new(pool, l);
52    pa_mempool_unref(pool), pool = NULL;
53
54    sdata = pa_memblock_acquire(c->memblock);
55    tdata = pa_memblock_acquire(n);
56
57    memcpy(tdata, (uint8_t*) sdata + c->index, c->length);
58
59    pa_memblock_release(c->memblock);
60    pa_memblock_release(n);
61
62    pa_memblock_unref(c->memblock);
63
64    c->memblock = n;
65    c->index = 0;
66
67    return c;
68}
69
70pa_memchunk* pa_memchunk_reset(pa_memchunk *c) {
71    pa_assert(c);
72
73    memset(c, 0, sizeof(*c));
74
75    return c;
76}
77
78pa_memchunk *pa_memchunk_will_need(const pa_memchunk *c) {
79    void *p;
80
81    pa_assert(c);
82    pa_assert(c->memblock);
83
84    /* A version of pa_memblock_will_need() that works on memchunks
85     * instead of memblocks */
86
87    p = pa_memblock_acquire_chunk(c);
88    pa_will_need(p, c->length);
89    pa_memblock_release(c->memblock);
90
91    return (pa_memchunk*) c;
92}
93
94pa_memchunk* pa_memchunk_memcpy(pa_memchunk *dst, pa_memchunk *src) {
95    void *p, *q;
96
97    pa_assert(dst);
98    pa_assert(src);
99    pa_assert(dst->length == src->length);
100
101    p = pa_memblock_acquire(dst->memblock);
102    q = pa_memblock_acquire(src->memblock);
103
104    memmove((uint8_t*) p + dst->index,
105            (uint8_t*) q + src->index,
106            dst->length);
107
108    pa_memblock_release(dst->memblock);
109    pa_memblock_release(src->memblock);
110
111    return dst;
112}
113
114bool pa_memchunk_isset(pa_memchunk *chunk) {
115    pa_assert(chunk);
116
117    return
118        chunk->memblock ||
119        chunk->index > 0 ||
120        chunk->length > 0;
121}
122