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sync.c - introduce swap_sync helper

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Just to remove code duplication

Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>
This commit is contained in:
Cyrill Gorcunov 2009-07-11 18:37:08 +04:00
parent 10b4a18d7f
commit 2ec4ad8556
1 changed files with 12 additions and 16 deletions
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28
sync.c
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@ -58,6 +58,13 @@ static struct Sync {
} *synx;
static int max_synx, nsynx;
static inline void swap_sync(uint32_t dst, uint32_t src)
{
struct Sync t = synx[dst];
synx[dst] = synx[src];
synx[src] = t;
}
void init_sync(void)
{
max_synx = SYNC_MAX-1;
@ -79,12 +86,8 @@ void add_sync(uint32_t pos, uint32_t length)
synx[nsynx].length = length;
for (i = nsynx; i > 1; i /= 2) {
if (synx[i / 2].pos > synx[i].pos) {
struct Sync t;
t = synx[i / 2]; /* structure copy */
synx[i / 2] = synx[i]; /* structure copy again */
synx[i] = t; /* another structure copy */
}
if (synx[i / 2].pos > synx[i].pos)
swap_sync(i / 2, i);
}
}
@ -92,11 +95,8 @@ uint32_t next_sync(uint32_t position, uint32_t *length)
{
while (nsynx > 0 && synx[1].pos + synx[1].length <= position) {
int i, j;
struct Sync t;
t = synx[nsynx]; /* structure copy */
synx[nsynx] = synx[1]; /* structure copy */
synx[1] = t; /* ditto */
swap_sync(nsynx, 1);
nsynx--;
i = 1;
@ -104,14 +104,10 @@ uint32_t next_sync(uint32_t position, uint32_t *length)
j = i * 2;
if (synx[j].pos < synx[i].pos &&
(j + 1 > nsynx || synx[j + 1].pos > synx[j].pos)) {
t = synx[j]; /* structure copy */
synx[j] = synx[i]; /* lots of these... */
synx[i] = t; /* ...aren't there? */
swap_sync(j, i);
i = j;
} else if (j + 1 <= nsynx && synx[j + 1].pos < synx[i].pos) {
t = synx[j + 1]; /* structure copy */
synx[j + 1] = synx[i]; /* structure <yawn> copy */
synx[i] = t; /* structure copy <zzzz....> */
swap_sync(j + 1, i);
i = j + 1;
} else
break;