[PATCH 6/6] sample: RFC: Assert validity of sample_spec

[pmeerw@xxxxxxxxxx (Peter Meerwald-Stadler)]

passing an invalid sample_spec to
pa_sample_size_of_format(),
pa_frame_size(),
pa_bytes_per_second(),
pa_bytes_to_usec(),
pa_usec_to_bytes()
currently gives a result of 0

this is problematic as
(a) it leads to many potential divide-by-zero issues flagged by Coverity,
(b) pa_sample_spec_valid() is called often and the mostly unnecessary validation
of the sample_spec cannot be optimized away due to pa_return_val_if_fail()
(c) nobody checks the result for 0 and the behaviour is not documented

this patch replaces pa_return_val_if_fail() with pa_assert()

note that this commit changes the API!
note that pa_return_val_if_fail() strangely logs an assertion, but then happily
continues...

fixes numerious CIDs
---
 src/pulse/sample.c | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/src/pulse/sample.c b/src/pulse/sample.c
index 1331c72..cb04254 100644
--- a/src/pulse/sample.c
+++ b/src/pulse/sample.c
@@ -56,37 +56,36 @@ size_t pa_sample_size_of_format(pa_sample_format_t f) {
 }
 
 size_t pa_sample_size(const pa_sample_spec *spec) {
-
     pa_assert(spec);
-    pa_return_val_if_fail(pa_sample_spec_valid(spec), 0);
+    pa_assert(pa_sample_spec_valid(spec));
 
     return size_table[spec->format];
 }
 
 size_t pa_frame_size(const pa_sample_spec *spec) {
     pa_assert(spec);
-    pa_return_val_if_fail(pa_sample_spec_valid(spec), 0);
+    pa_assert(pa_sample_spec_valid(spec));
 
     return size_table[spec->format] * spec->channels;
 }
 
 size_t pa_bytes_per_second(const pa_sample_spec *spec) {
     pa_assert(spec);
-    pa_return_val_if_fail(pa_sample_spec_valid(spec), 0);
+    pa_assert(pa_sample_spec_valid(spec));
 
     return spec->rate * size_table[spec->format] * spec->channels;
 }
 
 pa_usec_t pa_bytes_to_usec(uint64_t length, const pa_sample_spec *spec) {
     pa_assert(spec);
-    pa_return_val_if_fail(pa_sample_spec_valid(spec), 0);
+    pa_assert(pa_sample_spec_valid(spec));
 
     return (((pa_usec_t) (length / (size_table[spec->format] * spec->channels)) * PA_USEC_PER_SEC) / spec->rate);
 }
 
 size_t pa_usec_to_bytes(pa_usec_t t, const pa_sample_spec *spec) {
     pa_assert(spec);
-    pa_return_val_if_fail(pa_sample_spec_valid(spec), 0);
+    pa_assert(pa_sample_spec_valid(spec));
 
     return (size_t) (((t * spec->rate) / PA_USEC_PER_SEC)) * (size_table[spec->format] * spec->channels);
 }
-- 
2.7.4