pa_memchunk* pa_memchunk_make_writable(pa_memchunk *c, size_t min) {
pa_memblock *n;
size_t l;
void *tdata, *sdata;
pa_assert(c);
pa_assert(c->memblock);
if (pa_memblock_ref_is_one(c->memblock) &&
!pa_memblock_is_read_only(c->memblock) &&
pa_memblock_get_length(c->memblock) >= c->index+min)
return c;
l = PA_MAX(c->length, min);
n = pa_memblock_new(pa_memblock_get_pool(c->memblock), l);
sdata = pa_memblock_acquire(c->memblock);
tdata = pa_memblock_acquire(n);
memcpy(tdata, (uint8_t*) sdata + c->index, c->length);
pa_memblock_release(c->memblock);
pa_memblock_release(n);
pa_memblock_unref(c->memblock);
c->memblock = n;
c->index = 0;
return c;
}
static void handle_srbchannel_memblock(pa_context *c, pa_memblock *memblock) {
pa_srbchannel *sr;
pa_tagstruct *t;
pa_assert(c);
/* Memblock sanity check */
if (!memblock) {
pa_context_fail(c, PA_ERR_PROTOCOL);
return;
} else if (pa_memblock_is_read_only(memblock)) {
pa_context_fail(c, PA_ERR_PROTOCOL);
return;
} else if (pa_memblock_is_ours(memblock)) {
pa_context_fail(c, PA_ERR_PROTOCOL);
return;
}
/* Create the srbchannel */
c->srb_template.memblock = memblock;
pa_memblock_ref(memblock);
sr = pa_srbchannel_new_from_template(c->mainloop, &c->srb_template);
if (!sr) {
pa_log_warn("Failed to create srbchannel from template");
c->srb_template.readfd = -1;
c->srb_template.writefd = -1;
pa_memblock_unref(c->srb_template.memblock);
c->srb_template.memblock = NULL;
return;
}
/* Ack the enable command */
t = pa_tagstruct_new();
pa_tagstruct_putu32(t, PA_COMMAND_ENABLE_SRBCHANNEL);
pa_tagstruct_putu32(t, c->srb_setup_tag);
pa_pstream_send_tagstruct(c->pstream, t);
/* ...and switch over */
pa_pstream_set_srbchannel(c->pstream, sr);
}
