prim_set.c

/* FreeRDP: A Remote Desktop Protocol Client
 * Routines to set a chunk of memory to a constant.
 * vi:ts=4 sw=4:
 *
 * (c) Copyright 2012 Hewlett-Packard Development Company, L.P.
 * Licensed under the Apache License, Version 2.0 (the "License"); you may
 * not use this file except in compliance with the License. You may obtain
 * a copy of the License at http://www.apache.org/licenses/LICENSE-2.0.
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
 * or implied. See the License for the specific language governing
 * permissions and limitations under the License.
 *
 */
 
#include <freerdp/config.h>
 
#include <string.h>
 
#include <freerdp/types.h>
#include <freerdp/primitives.h>
 
#include "prim_internal.h"
#include "prim_set.h"
 
/* ========================================================================= */
static pstatus_t general_set_8u(BYTE val, BYTE* WINPR_RESTRICT pDst, UINT32 len)
{
  memset((void*)pDst, (int)val, (size_t)len);
  return PRIMITIVES_SUCCESS;
}
 
/* ------------------------------------------------------------------------- */
static pstatus_t general_zero(void* WINPR_RESTRICT pDst, size_t len)
{
  memset(pDst, 0, len);
  return PRIMITIVES_SUCCESS;
}
 
/* ========================================================================= */
static pstatus_t general_set_32s(INT32 val, INT32* WINPR_RESTRICT pDst, UINT32 len)
{
  INT32* dptr = pDst;
  size_t span = 0;
  size_t remaining = 0;
  primitives_t* prims = NULL;
 
  if (len < 256)
  {
    while (len--)
      *dptr++ = val;
 
    return PRIMITIVES_SUCCESS;
  }
 
  /* else quadratic growth memcpy algorithm */
  span = 1;
  *dptr = val;
  remaining = len - 1;
  prims = primitives_get();
 
  while (remaining)
  {
    size_t thiswidth = span;
 
    if (thiswidth > remaining)
      thiswidth = remaining;
 
    const size_t s = thiswidth << 2;
    WINPR_ASSERT(thiswidth <= INT32_MAX);
    prims->copy_8u((BYTE*)dptr, (BYTE*)(dptr + span), (INT32)s);
    remaining -= thiswidth;
    span <<= 1;
  }
 
  return PRIMITIVES_SUCCESS;
}
 
/* ------------------------------------------------------------------------- */
static pstatus_t general_set_32u(UINT32 val, UINT32* WINPR_RESTRICT pDst, UINT32 len)
{
  UINT32* dptr = pDst;
  size_t span = 0;
  size_t remaining = 0;
  primitives_t* prims = NULL;
 
  if (len < 256)
  {
    while (len--)
      *dptr++ = val;
 
    return PRIMITIVES_SUCCESS;
  }
 
  /* else quadratic growth memcpy algorithm */
  span = 1;
  *dptr = val;
  remaining = len - 1;
  prims = primitives_get();
 
  while (remaining)
  {
    size_t thiswidth = span;
 
    if (thiswidth > remaining)
      thiswidth = remaining;
 
    const size_t s = thiswidth << 2;
    WINPR_ASSERT(thiswidth <= INT32_MAX);
    prims->copy_8u((BYTE*)dptr, (BYTE*)(dptr + span), (INT32)s);
    remaining -= thiswidth;
    span <<= 1;
  }
 
  return PRIMITIVES_SUCCESS;
}
 
/* ------------------------------------------------------------------------- */
void primitives_init_set(primitives_t* WINPR_RESTRICT prims)
{
  /* Start with the default. */
  prims->set_8u = general_set_8u;
  prims->set_32s = general_set_32s;
  prims->set_32u = general_set_32u;
  prims->zero = general_zero;
}
 
void primitives_init_set_opt(primitives_t* WINPR_RESTRICT prims)
{
  primitives_init_set(prims);
  primitives_init_set_sse2(prims);
}