buffer: convert to stdatomic
[ffmpeg.git] / libavutil / tree.c
index e614f72..a65d728 100644 (file)
@@ -18,7 +18,8 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
-#include "log.h"
+#include "error.h"
+#include "mem.h"
 #include "tree.h"
 
 typedef struct AVTreeNode {
@@ -27,7 +28,10 @@ typedef struct AVTreeNode {
     int state;
 } AVTreeNode;
 
-const int av_tree_node_size = sizeof(AVTreeNode);
+struct AVTreeNode *av_tree_node_alloc(void)
+{
+    return av_mallocz(sizeof(struct AVTreeNode));
+}
 
 void *av_tree_find(const AVTreeNode *t, void *key,
                    int (*cmp)(void *key, const void *b), void *next[2])
@@ -35,7 +39,8 @@ void *av_tree_find(const AVTreeNode *t, void *key,
     if (t) {
         unsigned int v = cmp(key, t->elem);
         if (v) {
-            if (next) next[v >> 31] = t->elem;
+            if (next)
+                next[v >> 31] = t->elem;
             return av_tree_find(t->child[(v >> 31) ^ 1], key, cmp, next);
         } else {
             if (next) {
@@ -63,56 +68,60 @@ void *av_tree_insert(AVTreeNode **tp, void *key,
                 void *next_elem[2];
                 av_tree_find(t->child[i], key, cmp, next_elem);
                 key = t->elem = next_elem[i];
-                v = -i;
+                v   = -i;
             } else {
                 *next = t;
-                *tp = NULL;
+                *tp   = NULL;
                 return NULL;
             }
         }
         ret = av_tree_insert(&t->child[v >> 31], key, cmp, next);
         if (!ret) {
-            int i = (v >> 31) ^ !!*next;
+            int i              = (v >> 31) ^ !!*next;
             AVTreeNode **child = &t->child[i];
             t->state += 2 * i - 1;
 
             if (!(t->state & 1)) {
                 if (t->state) {
                     /* The following code is equivalent to
-                    if((*child)->state*2 == -t->state)
-                        rotate(child, i^1);
-                    rotate(tp, i);
-
-                    with rotate():
-                    static void rotate(AVTreeNode **tp, int i) {
-                        AVTreeNode *t= *tp;
-
-                        *tp= t->child[i];
-                        t->child[i]= t->child[i]->child[i^1];
-                        (*tp)->child[i^1]= t;
-                        i= 4*t->state + 2*(*tp)->state + 12;
-                          t  ->state=                     ((0x614586 >> i) & 3)-1;
-                        (*tp)->state= ((*tp)->state>>1) + ((0x400EEA >> i) & 3)-1;
-                    }
-                    but such a rotate function is both bigger and slower
-                    */
-                    if (( *child )->state * 2 == -t->state) {
+                     * if ((*child)->state * 2 == -t->state)
+                     *     rotate(child, i ^ 1);
+                     * rotate(tp, i);
+                     *
+                     * with rotate():
+                     * static void rotate(AVTreeNode **tp, int i)
+                     * {
+                     *     AVTreeNode *t= *tp;
+                     *
+                     *     *tp = t->child[i];
+                     *     t->child[i] = t->child[i]->child[i ^ 1];
+                     *     (*tp)->child[i ^ 1] = t;
+                     *     i = 4 * t->state + 2 * (*tp)->state + 12;
+                     *     t->state     = ((0x614586 >> i) & 3) - 1;
+                     *     (*tp)->state = ((0x400EEA >> i) & 3) - 1 +
+                     *                    ((*tp)->state >> 1);
+                     * }
+                     * but such a rotate function is both bigger and slower
+                     */
+                    if ((*child)->state * 2 == -t->state) {
                         *tp                    = (*child)->child[i ^ 1];
                         (*child)->child[i ^ 1] = (*tp)->child[i];
                         (*tp)->child[i]        = *child;
-                        *child                 = ( *tp )->child[i ^ 1];
+                        *child                 = (*tp)->child[i ^ 1];
                         (*tp)->child[i ^ 1]    = t;
 
                         (*tp)->child[0]->state = -((*tp)->state > 0);
-                        (*tp)->child[1]->state =   (*tp)->state < 0;
+                        (*tp)->child[1]->state = (*tp)->state < 0;
                         (*tp)->state           = 0;
                     } else {
-                        *tp                    = *child;
-                        *child                 = (*child)->child[i ^ 1];
-                        (*tp)->child[i ^ 1]    = t;
-                        if ((*tp)->state) t->state = 0;
-                        else              t->state >>= 1;
-                        (*tp)->state           = -t->state;
+                        *tp                 = *child;
+                        *child              = (*child)->child[i ^ 1];
+                        (*tp)->child[i ^ 1] = t;
+                        if ((*tp)->state)
+                            t->state = 0;
+                        else
+                            t->state >>= 1;
+                        (*tp)->state = -t->state;
                     }
                 }
             }
@@ -154,76 +163,3 @@ void av_tree_enumerate(AVTreeNode *t, void *opaque,
             av_tree_enumerate(t->child[1], opaque, cmp, enu);
     }
 }
-
-#ifdef TEST
-
-#include "lfg.h"
-
-static int check(AVTreeNode *t)
-{
-    if (t) {
-        int left  = check(t->child[0]);
-        int right = check(t->child[1]);
-
-        if (left>999 || right>999)
-            return 1000;
-        if (right - left != t->state)
-            return 1000;
-        if (t->state>1 || t->state<-1)
-            return 1000;
-        return FFMAX(left, right) + 1;
-    }
-    return 0;
-}
-
-static void print(AVTreeNode *t, int depth)
-{
-    int i;
-    for (i = 0; i < depth * 4; i++) av_log(NULL, AV_LOG_ERROR, " ");
-    if (t) {
-        av_log(NULL, AV_LOG_ERROR, "Node %p %2d %p\n", t, t->state, t->elem);
-        print(t->child[0], depth + 1);
-        print(t->child[1], depth + 1);
-    } else
-        av_log(NULL, AV_LOG_ERROR, "NULL\n");
-}
-
-static int cmp(void *a, const void *b)
-{
-    return (uint8_t *) a - (const uint8_t *) b;
-}
-
-int main (void)
-{
-    int i;
-    void *k;
-    AVTreeNode *root = NULL, *node = NULL;
-    AVLFG prng;
-
-    av_lfg_init(&prng, 1);
-
-    for (i = 0; i < 10000; i++) {
-        int j = av_lfg_get(&prng) % 86294;
-        if (check(root) > 999) {
-            av_log(NULL, AV_LOG_ERROR, "FATAL error %d\n", i);
-        print(root, 0);
-            return -1;
-        }
-        av_log(NULL, AV_LOG_ERROR, "inserting %4d\n", j);
-        if (!node)
-            node = av_mallocz(av_tree_node_size);
-        av_tree_insert(&root, (void *) (j + 1), cmp, &node);
-
-        j = av_lfg_get(&prng) % 86294;
-        {
-            AVTreeNode *node2 = NULL;
-            av_log(NULL, AV_LOG_ERROR, "removing %4d\n", j);
-            av_tree_insert(&root, (void *) (j + 1), cmp, &node2);
-            k = av_tree_find(root, (void *) (j + 1), cmp, NULL);
-            if (k)
-                av_log(NULL, AV_LOG_ERROR, "removal failure %d\n", i);
-        }
-    }
-    return 0;
-}
-#endif