1 files changed, 85 insertions, 0 deletions
diff --git a/src/core/ngx_hunk.c b/src/core/ngx_hunk.c
new file mode 100644
index 000000000..3defc6d0b
--- /dev/null
+++ b/src/core/ngx_hunk.c
@@ -0,0 +1,85 @@
+
+#include <ngx_types.h>
+#include <ngx_hunk.h>
+
+
+ngx_hunk_t *ngx_get_hunk(ngx_pool_t *pool, int size, int before, int after)
+{
+    ngx_hunk_t *h = ngx_palloc(pool, sizeof(ngx_hunk_t));
+
+#ifndef OFF_EQUAL_PTR
+    h->pos.f = h->last.f = 0;
+#endif
+
+    h->pre_start = ngx_palloc(pool, size + before + after);
+    h->start = h->pos.p = h->last.p = h->pre_start + before;
+    h->end = h->last.p + size;
+    h->post_end = h->end + after;
+
+    h->type = NGX_HUNK_TEMP;
+    h->tag = 0;
+    h->fd = (ngx_file_t) -1;
+
+    return h;
+}
+    
+ngx_hunk_t *ngx_get_hunk_before(ngx_pool_t *pool, ngx_hunk_t *hunk, int size)
+{    
+    ngx_hunk_t *h = ngx_palloc(pool, sizeof(ngx_hunk_t));
+
+#ifndef OFF_EQUAL_PTR
+    h->pos.f = h->last.f = 0;
+#endif
+ 
+    if (hunk->type & NGX_HUNK_TEMP && hunk->pos.p - hunk->pre_start >= size) {
+        /* keep hunk->start unchanged - used in restore */
+        h->pre_start = hunk->pre_start;
+        h->end = h->post_end = hunk->pre_start = hunk->pos.p;
+        h->start = h->pos.p = h->last.p = h->end - size;
+
+        h->type = NGX_HUNK_TEMP;
+        h->tag = 0;
+        h->fd = (ngx_file_t) -1;
+
+    } else {
+        h->pre_start = h->start = h->pos.p = h->last.p = ngx_palloc(pool, size);
+        h->end = h->post_end = h->start + size;
+
+        h->type = NGX_HUNK_TEMP;
+        h->tag = 0;
+        h->fd = (ngx_file_t) -1;
+    }
+
+    return h;
+}
+
+ngx_hunk_t *ngx_get_hunk_after(ngx_pool_t *pool, ngx_hunk_t *hunk, int size)
+{
+    ngx_hunk_t *h = ngx_palloc(pool, sizeof(ngx_hunk_t));
+
+#ifndef OFF_EQUAL_PTR
+    h->pos.f = h->last.f = 0;
+#endif
+
+    if (hunk->type & NGX_HUNK_TEMP
+        && hunk->last.p == hunk->end
+        && hunk->post_end - hunk->end >= size)
+    {
+        h->post_end = hunk->post_end;
+        h->pre_start = h->start = h->pos.p = h->last.p = hunk->post_end =
+                                                                  hunk->last.p;
+        h->type = NGX_HUNK_TEMP;
+        h->tag = 0;
+        h->fd = (ngx_file_t) -1;
+
+    } else {
+        h->pre_start = h->start = h->pos.p = h->last.p = ngx_palloc(pool, size);
+        h->end = h->post_end = h->start + size;
+
+        h->type = NGX_HUNK_TEMP;
+        h->tag = 0;
+        h->fd = (ngx_file_t) -1;
+    }
+
+    return h;
+}