+/*
+ * BabelTrace - Bitfield Type Converter
+ *
+ * Copyright (c) 2010 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <babeltrace/compiler.h>
+#include <stdint.h>
+
+/*
+ * Shortcut to integer copy if we copy bit-aligned data with 0 start_offset.
+ * This skips the bitfield overhead when dealing with enumerations (which use
+ * the bitfield copy functions).
+ */
+extern
+size_t integer_copy(unsigned char *dest, const struct format *fdest,
+ const unsigned char *src, const struct format *fsrc,
+ const struct type_class *type_class);
+
+size_t bitfield_copy(unsigned char *dest, const struct format *fdest,
+ const unsigned char *src, const struct format *fsrc,
+ const struct type_class *type_class)
+{
+ struct type_class_bitfield *bitfield_class =
+ container_of(type_class, struct type_class_bitfield, p);
+ struct type_class_integer *int_class = &bitfield_class->p;
+
+ if (!(int_class->p.alignment % CHAR_BIT)
+ && !(int_class->len % CHAR_BIT)
+ && !(bitfield_class->start_offset))
+ return integer_copy(dest, fdest, src, fsrc, type_class);
+
+ if (!int_class->signedness) {
+ uint64_t v;
+
+ v = fsrc->bitfield_unsigned_read(src,
+ bitfield_class->start_offset,
+ int_class->len,
+ int_class->byte_order);
+ return fdest->bitfield_unsigned_write(dest,
+ bitfield_class->start_offset,
+ int_class->len, int_class->byte_order,
+ v);
+ } else {
+ int64_t v;
+
+ v = fsrc->bitfield_signed_read(src,
+ bitfield_class->start_offset,
+ int_class->len,
+ int_class->byte_order);
+ return fdest->bitfield_signed_write(dest,
+ bitfield_class->start_offset,
+ int_class->len, int_class->byte_order,
+ v);
+ }
+}
+
+int bitfield_type_new(const char *name, size_t start_offset,
+ size_t len, int byte_order, int signedness)
+{
+ struct type_class_bitfield bitfield_class;
+ struct type_class_integer *int_class;
+ int ret;
+
+ /*
+ * Freed when type is unregistered.
+ */
+ bitfield_class = g_new(struct type_class_bitfield, 1);
+ int_class = &bitfield_class->p;
+ int_class->p.name = g_quark_from_string(name);
+ int_class->len = len;
+ int_class->byte_order = byte_order;
+ int_class->signedness = signedness;
+ bitfield_class->start_offset = start_offset;
+ ret = ctf_register_type(&int_class->p);
+ if (ret)
+ g_free(bitfield_class);
+ return ret;
+}
+
+/* TODO: bitfield_type_free */