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#ifndef foomemchunkhfoo
#define foomemchunkhfoo
/***
This file is part of PulseAudio.
Copyright 2004-2006 Lennart Poettering
PulseAudio is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation; either version 2.1 of the
License, or (at your option) any later version.
PulseAudio 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with PulseAudio; if not, see <http://www.gnu.org/licenses/>.
***/
typedef struct pa_memchunk pa_memchunk;
#include <pulsecore/memblock.h>
/* A memchunk describes a part of a memblock. In contrast to the memblock, a
* memchunk is not allocated dynamically or reference counted, instead
* it is usually stored on the stack and copied around */
struct pa_memchunk {
pa_memblock *memblock;
size_t index, length;
};
/* Make a memchunk writable, i.e. make sure that the caller may have
* exclusive access to the memblock and it is not read-only. If needed
* the memblock in the structure is replaced by a copy. If min is not
* 0 it is made sure that the returned memblock is at least of the
* specified size, i.e. is enlarged if necessary. */
pa_memchunk* pa_memchunk_make_writable(pa_memchunk *c, size_t min);
/* Invalidate a memchunk. This does not free the containing memblock,
* but sets all members to zero. */
pa_memchunk* pa_memchunk_reset(pa_memchunk *c);
/* Map a memory chunk back into memory if it was swapped out */
pa_memchunk *pa_memchunk_will_need(const pa_memchunk *c);
/* Copy the data in the src memchunk to the dst memchunk */
pa_memchunk* pa_memchunk_memcpy(pa_memchunk *dst, pa_memchunk *src);
/* Return true if any field is set != 0 */
bool pa_memchunk_isset(pa_memchunk *c);
#endif
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