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/* $Id$ */
/***
This file is part of polypaudio.
polypaudio is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published
by the Free Software Foundation; either version 2 of the License,
or (at your option) any later version.
polypaudio is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with polypaudio; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
USA.
***/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <string.h>
#include "memchunk.h"
void pa_memchunk_make_writable(struct pa_memchunk *c) {
struct pa_memblock *n;
assert(c && c->memblock && c->memblock->ref >= 1);
if (c->memblock->ref == 1)
return;
n = pa_memblock_new(c->length);
assert(n);
memcpy(n->data, c->memblock->data+c->index, c->length);
pa_memblock_unref(c->memblock);
c->memblock = n;
c->index = 0;
}
struct pa_mcalign {
size_t base;
struct pa_memchunk chunk;
uint8_t *buffer;
size_t buffer_fill;
};
struct pa_mcalign *pa_mcalign_new(size_t base) {
struct pa_mcalign *m;
assert(base);
m = malloc(sizeof(struct pa_mcalign));
assert(m);
m->base = base;
m->chunk.memblock = NULL;
m->chunk.length = m->chunk.index = 0;
m->buffer = NULL;
m->buffer_fill = 0;
return m;
}
void pa_mcalign_free(struct pa_mcalign *m) {
assert(m);
free(m->buffer);
if (m->chunk.memblock)
pa_memblock_unref(m->chunk.memblock);
free(m);
}
void pa_mcalign_push(struct pa_mcalign *m, const struct pa_memchunk *c) {
assert(m && c && !m->chunk.memblock && c->memblock && c->length);
m->chunk = *c;
pa_memblock_ref(m->chunk.memblock);
}
int pa_mcalign_pop(struct pa_mcalign *m, struct pa_memchunk *c) {
assert(m && c && m->base > m->buffer_fill);
int ret;
if (!m->chunk.memblock)
return -1;
if (m->buffer_fill) {
size_t l = m->base - m->buffer_fill;
if (l > m->chunk.length)
l = m->chunk.length;
assert(m->buffer && l);
memcpy(m->buffer + m->buffer_fill, m->chunk.memblock->data + m->chunk.index, l);
m->buffer_fill += l;
m->chunk.index += l;
m->chunk.length -= l;
if (m->chunk.length == 0) {
m->chunk.length = m->chunk.index = 0;
pa_memblock_unref(m->chunk.memblock);
m->chunk.memblock = NULL;
}
assert(m->buffer_fill <= m->base);
if (m->buffer_fill == m->base) {
c->memblock = pa_memblock_new_dynamic(m->buffer, m->base);
assert(c->memblock);
c->index = 0;
c->length = m->base;
m->buffer = NULL;
m->buffer_fill = 0;
return 0;
}
return -1;
}
m->buffer_fill = m->chunk.length % m->base;
if (m->buffer_fill) {
assert(!m->buffer);
m->buffer = malloc(m->base);
assert(m->buffer);
m->chunk.length -= m->buffer_fill;
memcpy(m->buffer, m->chunk.memblock->data + m->chunk.index + m->chunk.length, m->buffer_fill);
}
if (m->chunk.length) {
*c = m->chunk;
pa_memblock_ref(c->memblock);
ret = 0;
} else
ret = -1;
m->chunk.length = m->chunk.index = 0;
pa_memblock_unref(m->chunk.memblock);
m->chunk.memblock = NULL;
return ret;
}
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