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spa: add dynamic builder helper

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Resizes the buffer dynamically. Be careful with getting the address
of a pod in the buffer, it might not be valid after building more stuff
with the builder.
This commit is contained in:
Wim Taymans 2022-03-01 20:32:58 +01:00
parent 23db50630d
commit d3a1b9fe31
2 changed files with 92 additions and 25 deletions
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81
spa/include/spa/pod/dynamic.h Normal file
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/* Simple Plugin API
*
* Copyright © 2018 Wim Taymans
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
#ifndef SPA_POD_DYNAMIC_H
#define SPA_POD_DYNAMIC_H
#ifdef __cplusplus
extern "C" {
#endif
#include <spa/pod/builder.h>
struct spa_pod_dynamic_builder {
struct spa_pod_builder b;
void *data;
uint32_t extend;
uint32_t _padding;
};
static int spa_pod_dynamic_builder_overflow(void *data, uint32_t size)
{
struct spa_pod_dynamic_builder *d = data;
int32_t old_size = d->b.size;
int32_t new_size = SPA_ROUND_UP_N(size, d->extend);
void *old_data = d->b.data;
if (old_data == d->data)
d->b.data = NULL;
if ((d->b.data = realloc(d->b.data, new_size)) == NULL)
return -errno;
if (old_data == d->data && d->b.data != old_data && old_size > 0)
memcpy(d->b.data, old_data, old_size);
d->b.size = new_size;
return 0;
}
static inline void spa_pod_dynamic_builder_init(struct spa_pod_dynamic_builder *builder,
void *data, uint32_t size, uint32_t extend)
{
static const struct spa_pod_builder_callbacks spa_pod_dynamic_builder_callbacks = {
SPA_VERSION_POD_BUILDER_CALLBACKS,
.overflow = spa_pod_dynamic_builder_overflow
};
builder->b = SPA_POD_BUILDER_INIT(data, size);
spa_pod_builder_set_callbacks(&builder->b, &spa_pod_dynamic_builder_callbacks, builder);
builder->extend = extend;
builder->data = data;
}
static inline void spa_pod_dynamic_builder_clean(struct spa_pod_dynamic_builder *builder)
{
if (builder->data != builder->b.data)
free(builder->b.data);
}
#ifdef __cplusplus
} /* extern "C" */
#endif
#endif /* SPA_POD_DYNAMIC_H */