Changeset c54f5d0 in mainline for uspace/app/bithenge/compound.c

Timestamp:

2012-08-09T05:23:54Z (12 years ago)

Author:

Sean Bartell <wingedtachikoma@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

71450c8

Parents:

3c70376

Message:

Bithenge: partial transforms

File:

• uspace/app/bithenge/compound.c (modified) (1 diff)

uspace/app/bithenge/compound.c

@@ -260 +260 @@
 }
 
+
+
+/***************** partial_transform                         *****************/
+
+typedef struct {
+        bithenge_transform_t base;
+        bithenge_transform_t *xform;
+} partial_transform_t;
+
+static inline bithenge_transform_t *partial_as_transform(
+    partial_transform_t *self)
+{
+        return &self->base;
+}
+
+static inline partial_transform_t *transform_as_partial(
+    bithenge_transform_t *base)
+{
+        return (partial_transform_t *)base;
+}
+
+static int partial_transform_apply(bithenge_transform_t *base,
+    bithenge_scope_t *scope, bithenge_node_t *in, bithenge_node_t **out)
+{
+        partial_transform_t *self = transform_as_partial(base);
+        if (bithenge_node_type(in) != BITHENGE_NODE_BLOB)
+                return EINVAL;
+        uint64_t size;
+        return bithenge_transform_prefix_apply(self->xform, scope,
+            bithenge_node_as_blob(in), out, &size);
+}
+
+static void partial_transform_destroy(bithenge_transform_t *base)
+{
+        partial_transform_t *self = transform_as_partial(base);
+        bithenge_transform_dec_ref(self->xform);
+        free(self);
+}
+
+static const bithenge_transform_ops_t partial_transform_ops = {
+        .apply = partial_transform_apply,
+        .destroy = partial_transform_destroy,
+};
+
+/** Create a transform that doesn't require its subtransform to use the whole
+ * input. Takes a reference to @a xform.
+ * @param[out] out Holds the new transform.
+ * @param xform The subtransform to apply.
+ * @return EOK on success or an error code from errno.h. */
+int bithenge_partial_transform(bithenge_transform_t **out,
+    bithenge_transform_t *xform)
+{
+        int rc;
+        partial_transform_t *self = malloc(sizeof(*self));
+        if (!self) {
+                rc = ENOMEM;
+                goto error;
+        }
+
+        rc = bithenge_init_transform(partial_as_transform(self),
+            &partial_transform_ops, 0);
+        if (rc != EOK)
+                goto error;
+
+        self->xform = xform;
+        *out = partial_as_transform(self);
+        return EOK;
+
+error:
+        free(self);
+        bithenge_transform_dec_ref(xform);
+        return rc;
+}
+
 /** @}
  */