/*
   XDS - OSSP Extensible Data Serialization Library
   Copyright (c) 2001 The OSSP Project (http://www.ossp.org/)
   Copyright (c) 2001 Cable & Wireless Deutschland (http://www.cw.com/de/)

   This file is part of OSSP XDS, an extensible data serialization
   library which can be found at http://www.ossp.com/pkg/xds/.

   Permission to use, copy, modify, and distribute this software for
   any purpose with or without fee is hereby granted, provided that
   the above copyright notice and this permission notice appear in all
   copies.

   THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED 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 THE AUTHORS AND COPYRIGHT HOLDERS AND THEIR
   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 <stdio.h>
#include <string.h>
#include <assert.h>
#include "../internal.h"

struct mystruct
    {
    int32_t   small;
    int64_t   big;
    u_int32_t positive;
    };

static int encode_mystruct_engine(xds_t* xds, void* engine_context, void* buffer, size_t buffer_size, va_list* args)
    {
    int rc;
    struct mystruct* ms;

    assert(xds != NULL);
    assert(buffer != NULL);
    assert(buffer_size != 0);
    assert(args != NULL);

    if (buffer_size >= sizeof(struct mystruct))
	{
	ms = va_arg(*args, struct mystruct*);
	rc = xds_encode(xds, "int32 int64 uint32", ms->small, ms->big, ms->positive);
	if (rc != XDS_OK)
	    return rc;
	}
    else
	return sizeof(struct mystruct);

    return 0;
    }

static int decode_mystruct_engine(xds_t* xds, void* engine_context, void* buffer, size_t buffer_size, va_list* args)
    {
    int rc;
    struct mystruct* ms;

    assert(xds != NULL);
    assert(buffer != NULL);
    assert(buffer_size != 0);
    assert(args != NULL);

    if (buffer_size >= sizeof(struct mystruct))
	{
	ms = va_arg(*args, struct mystruct*);
	rc = xds_decode(xds, "int32 int64 uint32", &(ms->small), &(ms->big), &(ms->positive));
	if (rc != XDS_OK)
	    return rc;
	}
    else
	return XDS_ERR_UNDERFLOW;

    return 0;
    }

int main()
    {
    xds_t* xds;
    char*  buffer;
    size_t buffer_size;

    struct mystruct ms, new_ms;
    ms.small    = -0x1234567;
    ms.big      = -0x1234567890abcdeLL;
    ms.positive = 42;

    /* Encode our copy of mystruct using our encoding callback. Then
       get a the buffer and destroy the context again. */

    xds = xds_init(XDS_ENCODE);
    if (xds == NULL)
	{
	printf("Failed to initialize XDS context.\n");
	return 1;
	}
    if (xds_register(xds, "mystruct", &encode_mystruct_engine, NULL) != XDS_OK ||
	xds_register(xds, "int32", &xdr_encode_int32, NULL) != XDS_OK ||
	xds_register(xds, "int64", &xdr_encode_int64, NULL) != XDS_OK ||
	xds_register(xds, "uint32", &xdr_encode_uint32, NULL) != XDS_OK)
	{
	printf("Failed to register my encoding engines.\n");
	return 1;
	}
    if (xds_encode(xds, "mystruct", &ms) != XDS_OK)
	{
	printf("xds_encode() failed!\n");
	return 1;
	}
    if (xds_getbuffer(xds, XDS_GIFT, (void**)&buffer, &buffer_size) != XDS_OK)
	{
	printf("xds_setbuffer() failed!\n");
	return 1;
	}
    xds_destroy(xds);

    /* Now create a decoding context and decode the whole thing again. */

    xds = xds_init(XDS_DECODE);
    if (xds == NULL)
	{
	printf("Failed to initialize XDS context.\n");
	return 1;
	}
    if (xds_register(xds, "mystruct", &decode_mystruct_engine, NULL) != XDS_OK ||
	xds_register(xds, "int32", &xdr_decode_int32, NULL) != XDS_OK ||
	xds_register(xds, "int64", &xdr_decode_int64, NULL) != XDS_OK ||
	xds_register(xds, "uint32", &xdr_decode_uint32, NULL) != XDS_OK)
	{
	printf("Failed to register my decoding engines.\n");
	return 1;
	}
    if (xds_setbuffer(xds, XDS_GIFT, buffer, buffer_size) != XDS_OK)
	{
	printf("xds_setbuffer() failed!\n");
	return 1;
	}
    if (xds_decode(xds, "mystruct", &new_ms) != XDS_OK)
	{
	printf("xds_decode() failed!\n");
	return 1;
	}
    xds_destroy(xds);

    /* Both structures must be identical. */

    if (memcmp(&ms, &new_ms, sizeof(struct mystruct)) != 0)
	{
	printf("Decoded data does not match the original!\n");
	return 1;
	}

    /* Everything went fine. */

    return 0;
    }