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
pa_memchunk_make_writable(pa_memchunk * c,size_t min)34 pa_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
pa_memchunk_reset(pa_memchunk * c)70 pa_memchunk* pa_memchunk_reset(pa_memchunk *c) {
71 pa_assert(c);
72
73 memset(c, 0, sizeof(*c));
74
75 return c;
76 }
77
pa_memchunk_will_need(const pa_memchunk * c)78 pa_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
pa_memchunk_memcpy(pa_memchunk * dst,pa_memchunk * src)94 pa_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
pa_memchunk_isset(pa_memchunk * chunk)114 bool 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