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#pragma once
#include <osmocom/core/bits.h>
/* Small helper inspired by msgb */
struct ubit_buf {
const ubit_t *buf; /*!< start of underlying buffer */
const ubit_t *data; /*!< next to be consumed bit */
size_t n_bits; /*!< number of total bits iin buffer */
};
/*! length of [remainig, to be processed] data in ubit_buf */
static inline size_t ubb_length(struct ubit_buf *ubb)
{
return ubb->n_bits - (ubb->data - ubb->buf);
}
/*! retrieve + remove a single ubit_t from start of ubit_buf */
static inline ubit_t ubb_pull_ubit(struct ubit_buf *ubb)
{
OSMO_ASSERT(ubb->data < ubb->buf + ubb->n_bits);
return *ubb->data++;
}
static inline void ubb_pull(struct ubit_buf *ubb, size_t count)
{
OSMO_ASSERT(ubb_length(ubb) >= count);
ubb->data += count;
}
/*! get pointer to next to be consumed bit */
static inline const ubit_t *ubb_data(struct ubit_buf *ubb)
{
return ubb->data;
}
static inline void ubb_init(struct ubit_buf *ubb, const ubit_t *bits, size_t n_bits)
{
ubb->buf = bits;
ubb->data = ubb->buf;
ubb->n_bits = n_bits;
}
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