/*

Copyright 1989, 1998  The Open Group

Permission to use, copy, modify, distribute, and sell this software and its

documentation for any purpose is hereby granted without fee, provided that

the above copyright notice appear in all copies and that both that

copyright notice and this permission notice appear in supporting

documentation.

The above copyright notice and this permission notice shall be included in

all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE

OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN

AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN

CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Except as contained in this notice, the name of The Open Group shall not be

used in advertising or otherwise to promote the sale, use or other dealings

in this Software without prior written authorization from The Open Group.

 *

 * Author:  Keith Packard, MIT X Consortium

 */

#ifdef HAVE_CONFIG_H

#include <config.h>

#endif

#include <X11/Xos.h>

#include <X11/X.h>

#include <X11/Xmd.h>

#include <X11/Xdmcp.h>

#include <stdlib.h>

int

XdmcpReadHeader (XdmcpBufferPtr buffer, XdmcpHeaderPtr header)

{

    if (XdmcpReadCARD16 (buffer, &header->version) &&

        XdmcpReadCARD16 (buffer, &header->opcode) &&

	XdmcpReadCARD16 (buffer, &header->length))

	return TRUE;

    return FALSE;

}

int

XdmcpReadRemaining (const XdmcpBufferPtr  buffer)

{

    return buffer->count - buffer->pointer;

}

int

XdmcpReadARRAY8 (XdmcpBufferPtr buffer, ARRAY8Ptr array)

{

    int	    i;

    /*

     * When returning FALSE, guarantee that array->data = 0.

     * This allows the user to safely call XdmcpDisposeARRAY8(array)

     * regardless of the return value below.

     * Note that XdmcpDisposeARRAY*(array) will call free(array->data),

     * so we must guarantee that array->data is NULL or a malloced pointer.

     */

    if (!XdmcpReadCARD16 (buffer, &array->length)) {

 	array->data = NULL;

	return FALSE;

    }

    if (!array->length)

    {

	array->data = NULL;

	return TRUE;

    }

    array->data = (CARD8 *) malloc(array->length * sizeof (CARD8));

    if (!array->data)

	return FALSE;

    for (i = 0; i < (int)array->length; i++)

    {

	if (!XdmcpReadCARD8 (buffer, &array->data[i]))

	{

	    free(array->data);

	    array->data = NULL;

	    array->length = 0;

	    return FALSE;

	}

    }

    return TRUE;

}

int

XdmcpReadARRAY16 (XdmcpBufferPtr buffer, ARRAY16Ptr array)

{

    int	    i;

    /*

     * When returning FALSE, guarantee that array->data = 0.

     * This allows the user to safely call XdmcpDisposeARRAY16(array)

     * regardless of the return value below.

     * Note that XdmcpDisposeARRAY*(array) will call free(array->data),

     * so we must guarantee that array->data is NULL or a malloced pointer.

     */

    if (!XdmcpReadCARD8 (buffer, &array->length)) {

	array->data = NULL;

	return FALSE;

    }

    if (!array->length)

    {

	array->data = NULL;

	return TRUE;

    }

    array->data = (CARD16 *) malloc(array->length * sizeof (CARD16));

    if (!array->data)

	return FALSE;

    for (i = 0; i < (int)array->length; i++)

    {

	if (!XdmcpReadCARD16 (buffer, &array->data[i]))

	{

	    free(array->data);

	    array->data = NULL;

	    array->length = 0;

	    return FALSE;

	}

    }

    return TRUE;

}

int

XdmcpReadARRAY32 (XdmcpBufferPtr buffer, ARRAY32Ptr array)

{

    int	    i;

    /*

     * When returning FALSE, guarantee that array->data = 0.

     * This allows the user to safely call XdmcpDisposeARRAY32(array)

     * regardless of the return value below.

     * Note that XdmcpDisposeARRAY*(array) will call free(array->data),

     * so we must guarantee that array->data is NULL or a malloced pointer.

     */

    if (!XdmcpReadCARD8 (buffer, &array->length)) {

	array->data = NULL;

	return FALSE;

    }

    if (!array->length)

    {

	array->data = NULL;

	return TRUE;

    }

    array->data = (CARD32 *) malloc(array->length * sizeof (CARD32));

    if (!array->data)

	return FALSE;

    for (i = 0; i < (int)array->length; i++)

    {

	if (!XdmcpReadCARD32 (buffer, &array->data[i]))

	{

	    free(array->data);

	    array->data = NULL;

	    array->length = 0;

	    return FALSE;

	}

    }

    return TRUE;

}

int

XdmcpReadARRAYofARRAY8 (XdmcpBufferPtr buffer, ARRAYofARRAY8Ptr array)

{

    CARD8    i;

    /*

     * When returning FALSE, guarantee that array->data = 0.

     * This allows the user to safely call XdmcpDisposeARRAYofARRAY8(array)

     * regardless of the return value below.

     * Note that XdmcpDisposeARRAY*(array) will call free(array->data),

     * so we must guarantee that array->data is NULL or a malloced pointer.

     */

    if (!XdmcpReadCARD8 (buffer, &array->length)) {

	array->data = NULL;

	return FALSE;

    }

    if (!array->length)

    {

	array->data = NULL;

	return TRUE;

    }

    array->data = (ARRAY8 *) malloc(array->length * sizeof (ARRAY8));

    if (!array->data)

	return FALSE;

    for (i = 0; i < array->length; i++)

    {

	if (!XdmcpReadARRAY8 (buffer, &array->data[i]))

	{

	    /*

	     * We must free all of the arrays allocated thus far in the loop

	     * and free array->data and finally set array->data = 0;

	     * The easiest way to do this is to reset the length and call

	     * XdmcpDisposeARRAYofARRAY8(array).

	     */

	    array->length = i;

	    XdmcpDisposeARRAYofARRAY8(array);

	    return FALSE;

	}

    }

    return TRUE;

}

int

XdmcpReadCARD8 (XdmcpBufferPtr buffer, CARD8Ptr valuep)

{

    if (buffer->pointer >= buffer->count)

	return FALSE;

    *valuep = (CARD8) buffer->data[buffer->pointer++];

    return TRUE;

}

int

XdmcpReadCARD16 (XdmcpBufferPtr buffer, CARD16Ptr valuep)

{

    CARD8   high, low;

    if (XdmcpReadCARD8 (buffer, &high) &&

        XdmcpReadCARD8 (buffer, &low))

    {

	*valuep = (((CARD16) high) << 8) | ((CARD16) low);

	return TRUE;

    }

    return FALSE;

}

int

XdmcpReadCARD32 (XdmcpBufferPtr buffer, CARD32Ptr valuep)

{

    CARD8   byte0, byte1, byte2, byte3;

    if (XdmcpReadCARD8 (buffer, &byte0) &&

        XdmcpReadCARD8 (buffer, &byte1) &&

	XdmcpReadCARD8 (buffer, &byte2) &&

	XdmcpReadCARD8 (buffer, &byte3))

    {

	*valuep = (((CARD32) byte0) << 24) |

		  (((CARD32) byte1) << 16) |

		  (((CARD32) byte2) << 8) |

		  (((CARD32) byte3));

	return TRUE;

    }

    return FALSE;

}