Implement entry_by_index() in src/bank.c

Implement entry_by_index() in src/bank.c to provide a single means of
obtaining a pointer to a xas_bank_entry object

1 files changed, 10 insertions, 3 deletions

diff --git a/src/bank.c b/src/bank.c
index 20a4569..d2c7de9 100644
--- a/src/bank.c
+++ b/src/bank.c
@@ -40,11 +40,19 @@ void xas_bank_destroy(xas_bank *bank) {
     free(bank);
 }
 
+static inline xas_bank_entry *entry_by_index(xas_bank *bank,
+                                               size_t index) {
+    size_t size   = sizeof(xas_bank_entry) + sizeof(int16_t) * bank->entry_size,
+           offset = size * index;
+
+    return (xas_bank_entry *)(((uint8_t *)(bank + 1)) + offset);
+}
+
 ssize_t xas_bank_record(xas_bank *bank,
                           xas_audio_stream *input,
                           size_t entry_index,
                           size_t count) {
-    xas_bank_entry *entry = &((xas_bank_entry *)(bank + 1))[entry_index];
+    xas_bank_entry *entry = entry_by_index(bank, entry_index);
 
     size_t left    = count,
            index_o = 0;
@@ -217,8 +225,7 @@ static ssize_t stream_fill(xas_bank_player *player,
 
     while (left) {
         if (player->status == XAS_BANK_PLAYER_PLAYING) {
-            xas_bank_entry *entry =
-                &((xas_bank_entry *)(bank + 1))[player->entry];
+            xas_bank_entry *entry = entry_by_index(bank, player->entry);
 
             int16_t *src = (int16_t *)(entry + 1);