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/* nbdkit
* Copyright Red Hat
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* * Neither the name of Red Hat nor the names of its contributors may be
* used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY RED HAT AND CONTRIBUTORS ''AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL RED HAT OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <caml/bigarray.h>
#include <caml/mlvalues.h>
#define NBDKIT_API_VERSION 2
#include <nbdkit-plugin.h>
/* Bindings for 'buf' type.
*
* We found that ocamlopt generated pretty poor code for copying into
* a Bigarray.
* https://discuss.ocaml.org/t/is-there-a-simple-library-that-wraps-a-c-mallocd-char-buffer/14323/12
*/
/* Workaround for OCaml < 4.06.0 */
#ifndef Bytes_val
#define Bytes_val(x) String_val (x)
#endif
/* NB: noalloc function. */
NBDKIT_DLL_PUBLIC value
ocaml_nbdkit_blit_from (value srcv, value src_posv,
value bufv, value buf_posv,
value lenv)
{
const char *src = String_val (srcv);
int src_pos = Int_val (src_posv);
struct caml_ba_array *buf = Caml_ba_array_val (bufv);
uint8_t *data = (uint8_t *)buf->data;
int buf_pos = Int_val (buf_posv);
int len = Int_val (lenv);
memcpy (&data[buf_pos], &src[src_pos], len);
return Val_unit;
}
/* NB: noalloc function. */
NBDKIT_DLL_PUBLIC value
ocaml_nbdkit_blit_to_bytes (value bufv, value buf_posv,
value dstv, value dst_posv,
value lenv)
{
struct caml_ba_array *buf = Caml_ba_array_val (bufv);
uint8_t *data = (uint8_t *)buf->data;
int buf_pos = Int_val (buf_posv);
char *dst = (char *) Bytes_val (dstv);
int dst_pos = Int_val (dst_posv);
int len = Int_val (lenv);
memcpy (&dst[dst_pos], &data[buf_pos], len);
return Val_unit;
}
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