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authorXavier Chantry <shiningxc@gmail.com>2009-09-18 16:45:04 +0200
committerDan McGee <dan@archlinux.org>2009-09-20 11:57:12 -0500
commit481014e944731e2756e16a7283f8a10498cadba4 (patch)
tree95095a4b43b378d7d54d9036b2eba2c29846dcf6 /lib/libalpm
parentf4809dcc9c27ac614e2a3381d4ecd8661beec8de (diff)
delta : simple code refactoring
This will make the code re-usable for other purpose. Signed-off-by: Xavier Chantry <shiningxc@gmail.com> Signed-off-by: Dan McGee <dan@archlinux.org>
Diffstat (limited to 'lib/libalpm')
-rw-r--r--lib/libalpm/delta.c67
1 files changed, 41 insertions, 26 deletions
diff --git a/lib/libalpm/delta.c b/lib/libalpm/delta.c
index 599a1b76..523968ec 100644
--- a/lib/libalpm/delta.c
+++ b/lib/libalpm/delta.c
@@ -71,34 +71,16 @@ off_t SYMEXPORT alpm_delta_get_size(pmdelta_t *delta)
/** @} */
-static alpm_list_t *delta_graph_init(alpm_list_t *deltas)
+static alpm_list_t *graph_init(alpm_list_t *deltas)
{
alpm_list_t *i, *j;
alpm_list_t *vertices = NULL;
/* create the vertices */
for(i = deltas; i; i = i->next) {
- char *fpath, *md5sum;
pmgraph_t *v = _alpm_graph_new();
pmdelta_t *vdelta = i->data;
vdelta->download_size = vdelta->delta_size;
v->weight = LONG_MAX;
-
- /* determine whether the delta file already exists */
- fpath = _alpm_filecache_find(vdelta->delta);
- md5sum = alpm_compute_md5sum(fpath);
- if(fpath && md5sum && strcmp(md5sum, vdelta->delta_md5) == 0) {
- vdelta->download_size = 0;
- }
- FREE(fpath);
- FREE(md5sum);
-
- /* determine whether a base 'from' file exists */
- fpath = _alpm_filecache_find(vdelta->from);
- if(fpath) {
- v->weight = vdelta->download_size;
- }
- FREE(fpath);
-
v->data = vdelta;
vertices = alpm_list_add(vertices, v);
}
@@ -128,8 +110,36 @@ static alpm_list_t *delta_graph_init(alpm_list_t *deltas)
return(vertices);
}
-static off_t delta_vert(alpm_list_t *vertices,
- const char *to, alpm_list_t **path) {
+static void graph_init_size(alpm_list_t *vertices)
+{
+ alpm_list_t *i;
+
+ for(i = vertices; i; i = i->next) {
+ char *fpath, *md5sum;
+ pmgraph_t *v = i->data;
+ pmdelta_t *vdelta = v->data;
+
+ /* determine whether the delta file already exists */
+ fpath = _alpm_filecache_find(vdelta->delta);
+ md5sum = alpm_compute_md5sum(fpath);
+ if(fpath && md5sum && strcmp(md5sum, vdelta->delta_md5) == 0) {
+ vdelta->download_size = 0;
+ }
+ FREE(fpath);
+ FREE(md5sum);
+
+ /* determine whether a base 'from' file exists */
+ fpath = _alpm_filecache_find(vdelta->from);
+ if(fpath) {
+ v->weight = vdelta->download_size;
+ }
+ FREE(fpath);
+ }
+}
+
+
+static void dijkstra(alpm_list_t *vertices)
+{
alpm_list_t *i;
pmgraph_t *v;
while(1) {
@@ -165,9 +175,14 @@ static off_t delta_vert(alpm_list_t *vertices,
}
}
+}
- v = NULL;
+static off_t shortest_path(alpm_list_t *vertices, const char *to, alpm_list_t **path)
+{
+ alpm_list_t *i;
+ pmgraph_t *v = NULL;
off_t bestsize = 0;
+ alpm_list_t *rpath = NULL;
for(i = vertices; i; i = i->next) {
pmgraph_t *v_i = i->data;
@@ -181,7 +196,6 @@ static off_t delta_vert(alpm_list_t *vertices,
}
}
- alpm_list_t *rpath = NULL;
while(v != NULL) {
pmdelta_t *vdelta = v->data;
rpath = alpm_list_add(rpath, vdelta);
@@ -219,9 +233,10 @@ off_t _alpm_shortest_delta_path(alpm_list_t *deltas,
_alpm_log(PM_LOG_DEBUG, "started delta shortest-path search for '%s'\n", to);
- vertices = delta_graph_init(deltas);
-
- bestsize = delta_vert(vertices, to, &bestpath);
+ vertices = graph_init(deltas);
+ graph_init_size(vertices);
+ dijkstra(vertices);
+ bestsize = shortest_path(vertices, to, &bestpath);
_alpm_log(PM_LOG_DEBUG, "delta shortest-path search complete : '%jd'\n", (intmax_t)bestsize);