#ifndef SCM_BYTEVECTORS_INTERNAL_H
#define SCM_BYTEVECTORS_INTERNAL_H

/* Copyright 2009, 2011, 2018, 2023, 2025
     Free Software Foundation, Inc.

   This file is part of Guile.

   Guile 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 3 of the License, or
   (at your option) any later version.

   Guile 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 Guile.  If not, see
   <https://www.gnu.org/licenses/>.  */



#include <libguile/bytevectors.h>
#include <libguile/error.h>
#include <libguile/uniform.h>

struct scm_bytevector
{
  scm_t_bits tag_flags_and_element_type;
  size_t length;
  signed char *contents;
  SCM parent;
  signed char inline_contents[];
};

static inline struct scm_bytevector *
scm_to_bytevector (SCM x)
{
  if (!SCM_BYTEVECTOR_P (x))
    abort ();
  return (struct scm_bytevector *) SCM_UNPACK_POINTER (x);
}

static inline SCM
scm_from_bytevector (struct scm_bytevector *bv)
{
  return SCM_PACK_POINTER (bv);
}

enum scm_bytevector_flags
  {
    SCM_F_BYTEVECTOR_IMMUTABLE = 0x80UL,
    SCM_F_BYTEVECTOR_CONTIGUOUS = 0x100UL
  };

static inline signed char*
scm_bytevector_contents (struct scm_bytevector *bv)
{
  return bv->contents;
}

static inline SCM
scm_bytevector_parent (struct scm_bytevector *bv)
{
  return bv->parent;
}

static inline int
scm_is_mutable_bytevector (SCM x)
{
  scm_t_bits tag = SCM_CELL_TYPE (x);
  return (tag & (0x7f | SCM_F_BYTEVECTOR_IMMUTABLE)) == scm_tc7_bytevector;
}

static inline scm_t_array_element_type
scm_bytevector_element_type (struct scm_bytevector *bv)
{
  return bv->tag_flags_and_element_type >> 16;
}

static inline int
scm_bytevector_is_contiguous (struct scm_bytevector *bv)
{
  return bv->tag_flags_and_element_type & SCM_F_BYTEVECTOR_CONTIGUOUS;
}

static inline int
scm_bytevector_is_immutable (struct scm_bytevector *bv)
{
  return bv->tag_flags_and_element_type & SCM_F_BYTEVECTOR_IMMUTABLE;
}

static inline size_t
scm_bytevector_type_size (struct scm_bytevector *bv)
{
  return scm_i_array_element_type_sizes[scm_bytevector_element_type (bv)]/8;
}

static inline size_t
scm_bytevector_typed_length (struct scm_bytevector *bv)
{
  return bv->length / scm_bytevector_type_size (bv);
}

SCM_INTERNAL struct scm_bytevector*
scm_i_make_typed_bytevector (size_t, scm_t_array_element_type);
SCM_INTERNAL SCM scm_c_take_typed_bytevector (signed char *, size_t,
                                              scm_t_array_element_type, SCM);

SCM_INTERNAL void scm_bootstrap_bytevectors (void);
SCM_INTERNAL void scm_init_bytevectors (void);

SCM_INTERNAL SCM scm_i_native_endianness;
SCM_INTERNAL SCM scm_c_take_gc_bytevector (signed char *, size_t, SCM);

SCM_INTERNAL int scm_i_print_bytevector (SCM, SCM, scm_print_state *);

SCM_INTERNAL struct scm_bytevector*
scm_c_shrink_bytevector (struct scm_bytevector*, size_t);
SCM_INTERNAL void scm_i_bytevector_generalized_set_x (SCM, size_t, SCM);
SCM_INTERNAL SCM scm_null_bytevector;

#endif /* SCM_BYTEVECTORS_INTERNAL_H */