FreeRDP/libfreerdp/primitives/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.
 *
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <string.h>

#include <freerdp/types.h>
#include <freerdp/primitives.h>

#include "prim_internal.h"
#include "prim_set.h"

/* ========================================================================= */
pstatus_t general_set_8u(
	BYTE val,
	BYTE *pDst,
	INT32 len)
{
	memset((void *) pDst, (int) val, (size_t) len);
	return PRIMITIVES_SUCCESS;
}

/* ------------------------------------------------------------------------- */
pstatus_t general_zero(
	void *pDst,
	size_t len)
{
	memset(pDst, 0, len);
	return PRIMITIVES_SUCCESS;
}

/* ========================================================================= */
pstatus_t general_set_32s(
	INT32 val,
	INT32 *pDst,
	INT32 len)
{
	INT32 *dptr = (INT32 *) pDst;
	size_t span, remaining;
	primitives_t *prims;

	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;
		prims->copy_8u((BYTE *) dptr, (BYTE *) (dptr + span), thiswidth<<2);
		remaining -= thiswidth;
		span <<= 1;
	}
	return PRIMITIVES_SUCCESS;
}

/* ------------------------------------------------------------------------- */
pstatus_t general_set_32u(
	UINT32 val,
	UINT32 *pDst,
	INT32 len)
{
	UINT32 *dptr = (UINT32 *) pDst;
	size_t span, remaining;
	primitives_t *prims;

	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;
		prims->copy_8u((BYTE *) dptr, (BYTE *) (dptr + span), thiswidth<<2);
		remaining -= thiswidth;
		span <<= 1;
	}
	return PRIMITIVES_SUCCESS;
}

/* ------------------------------------------------------------------------- */
void primitives_init_set(
	primitives_t *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;

	primitives_init_set_opt(prims);
}

/* ------------------------------------------------------------------------- */
void primitives_deinit_set(
	primitives_t *prims)
{
	/* Nothing to do. */
}