*/
#include <babeltrace/format.h>
+#include <babeltrace/align.h>
+#include <string.h>
+
+/*
+ * Always update stream_pos with move_pos and init_pos.
+ */
+struct stream_pos {
+ unsigned char *base; /* Base address */
+ size_t offset; /* Offset from base, in bits */
+ int dummy; /* Dummy position, for length calculation */
+};
+
+static inline
+void init_pos(struct stream_pos *pos, unsigned char *base)
+{
+ pos->base = base; /* initial base, page-aligned */
+ pos->offset = 0;
+ pos->dummy = false;
+}
+
+/*
+ * move_pos - move position of a relative bit offset
+ *
+ * TODO: allow larger files by updating base too.
+ */
+static inline
+void move_pos(struct stream_pos *pos, size_t offset)
+{
+ pos->offset = pos->offset + offset;
+}
+
+/*
+ * align_pos - align position on a bit offset (> 0)
+ *
+ * TODO: allow larger files by updating base too.
+ */
+static inline
+void align_pos(struct stream_pos *pos, size_t offset)
+{
+ pos->offset += offset_align(pos->offset, offset);
+}
+
+static inline
+void copy_pos(struct stream_pos *dest, struct stream_pos *src)
+{
+ memcpy(dest, src, sizeof(struct stream_pos));
+}
+
+static inline
+unsigned char *get_pos_addr(struct stream_pos *pos)
+{
+ /* Only makes sense to get the address after aligning on CHAR_BIT */
+ assert(!(pos->alignment % CHAR_BIT));
+ return pos->base + (pos->offset / CHAR_BIT);
+}
struct type_class {
GQuark name; /* type name */
* Type copy function. Knows how to find the child type_class from the
* parent type_class.
*/
- size_t (*copy)(unsigned char *dest, const struct format *fdest,
- const unsigned char *src, const struct format *fsrc,
+ size_t (*copy)(struct stream_pos *dest, const struct format *fdest,
+ struct stream_pos *src, const struct format *fsrc,
const struct type_class *type_class);
+ void (*free)(struct type_class *type_class);
};
struct type_class_integer {
int signedness;
};
+/*
+ * Because we address in bits, bitfields end up being exactly the same as
+ * integers, except that their read/write functions must be able to deal with
+ * read/write non aligned on CHAR_BIT.
+ */
struct type_class_bitfield {
struct type_class_integer p;
- size_t start_offset; /* offset from base address, in bits */
};
struct type_class_float {
struct type_class p;
- size_t mantissa_len;
- size_t exp_len;
+ struct bitfield_class *mantissa;
+ struct bitfield_class *exp;
int byte_order;
/* TODO: we might want to express more info about NaN, +inf and -inf */
};
struct enum_table table;
};
+struct type_class_string {
+ struct type_class p;
+};
+
struct type_class_struct {
struct type_class p;
/* TODO */