/*
Copyright (c) 2000 Simon Hausmann <hausmann@kde.org>

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

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
AUTHORS 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.
*/

#include "marshal.h"

#include <glib.h>

#include <assert.h>
#include <stdlib.h>
#include <string.h>

/* The code in previous revisions was broken on little endian system, also see KDE bug #32463 */
/* The current code was not tested on big endian system, so it could be another issue and big */
/* endian systems would need the same code as the little endian ones                          */
#include <endian.h>

dcop_data *dcop_data_new()
{
    dcop_data *res = g_new( dcop_data, 1 );

    res->ptr = 0;
    res->size = 0;
    res->cur = 0;
    res->ref = 0;

    return res;
}

void dcop_data_destroy( dcop_data *data )
{
    g_assert( data->ref == 0 );

    g_free( data->ptr );

    g_free( data );
}

dcop_data *dcop_data_copy( dcop_data *data )
{
    dcop_data *res = dcop_data_new();
    res->ptr = (char *)g_malloc( data->size );
    res->size = data->size;
    dcop_data_reset( res );
    memcpy( res->ptr, data->ptr, data->size );
    return res;
}

static gboolean dcop_data_check_size( dcop_data *data, unsigned int size )
{
    if ( data->size - ( data->cur - data->ptr ) < size )
	return FALSE;
    return TRUE;
}

gboolean dcop_marshal_raw( dcop_data *data, const void *ptr, unsigned int size )
{
    unsigned int relptr = data->cur - data->ptr;

    data->ptr = (char *)g_realloc( data->ptr, data->size + size );

    if ( data->ptr == 0 )
	return FALSE;

    data->cur = data->ptr + relptr;

    memcpy( data->cur, ptr, size );

    data->cur += size;
    data->size += size;

    return TRUE;
}

gboolean dcop_marshal_uint32( dcop_data *data, unsigned int val )
{
    unsigned char buf[4];

    g_assert( sizeof( unsigned int ) == 4 );

#ifdef __BIG_ENDIAN__
    buf[0] = val;
    buf[1] = val >> 8;
    buf[2] = val >> 16;
    buf[3] = val >> 24;
#endif
#ifdef __LITTLE_ENDIAN__
    buf[3] = val;
    buf[2] = val >> 8;
    buf[1] = val >> 16;
    buf[0] = val >> 24;
#endif
#if (!defined(__LITTLE_ENDIAN) && !defined(__BIG_ENDIAN))
#error "You cannot compile the DCOP C bindings without defining either __LITTLE_ENDIAN or __BIG_ENDIAN"
#endif

    return dcop_marshal_raw( data, buf, 4 );
}

gboolean dcop_demarshal_uint32( dcop_data *data, unsigned int *val )
{
    g_assert( sizeof( unsigned int ) == 4 );

    if ( !dcop_data_check_size( data, 4 ) )
	return FALSE;

#ifdef __BIG_ENDIAN__
    *val = (data->cur[3] << 24) |
           (data->cur[2] << 16) |
           (data->cur[1] << 8) |
           data->cur[0]; 
#endif
#ifdef __LITTLE_ENDIAN__
    *val = (data->cur[0] << 24) |
           (data->cur[1] << 16) |
           (data->cur[2] << 8) |
           data->cur[3]; 
#endif
#if (!defined(__LITTLE_ENDIAN) && !defined(__BIG_ENDIAN))
#error "You cannot compile the DCOP C bindings without defining either __LITTLE_ENDIAN or __BIG_ENDIAN"
#endif
    data->cur += 4;

    return TRUE;
}

gboolean dcop_marshal_string( dcop_data *data, const gchar *str )
{
    size_t l = 0;

    if ( str )
	l = strlen( str ) + 1;

    if( !dcop_marshal_uint32( data, l ) )
	return FALSE;

    if ( str )
	return dcop_marshal_raw( data, str, l );
    else
	return TRUE;
}

gboolean dcop_demarshal_string( dcop_data *data, gchar **str )
{
    unsigned int l = 0;
    gchar *res = 0;

    g_assert( str );

    if ( !dcop_demarshal_uint32( data, &l ) )
	return FALSE;

    if ( !dcop_data_check_size( data, l ) )
	return FALSE;

    res = (char *)g_malloc( l );
    memcpy( res, data->cur, l );
    data->cur += l;

    *str = res;

    return TRUE;
}


gboolean dcop_marshal_string16( dcop_data *data, const gchar *str )
{
    size_t l = 0;
    size_t c = 0;
    char *tmp = 0;
    const char *src = str;
    char *dst = 0;

    if ( str )
	l = strlen( str ) * 2;
    else
    {
	/* null marker*/
	guint32 s = 0xffffffff;
	return dcop_marshal_uint32( data, s );
    }

    if( !dcop_marshal_uint32( data, l ) )
	return FALSE;

    if ( str )
    {
	dst = tmp = (char *)g_malloc( l );
	c = strlen( str );

	while ( c-- )
	{
	    *dst++ = 0;
	    *dst++ = *src++;
	}

	dcop_marshal_raw( data, tmp, l );

	g_free( tmp );
    }
    return TRUE;
}

gboolean dcop_demarshal_string16( dcop_data *data, gchar **str )
{
    unsigned int l = 0;
    unsigned int size = 0;
    char *res = 0;
    char *p = 0;

    assert( str );

    if ( !dcop_demarshal_uint32( data, &l ) )
	return FALSE;

    /* null marker*/
    if ( l == 0xffffffff )
    {
	*str = 0;
	return TRUE;
    }

    if ( !dcop_data_check_size( data, l ) )
	return FALSE;

    size = ( l / 2 );

    p = res = (char *)g_malloc( size + 1 );

    while( size-- )
    {
	data->cur++;
	*p++ = *data->cur++;
    }

    *p = '\0';

    *str = res;

    return TRUE;
}

gboolean dcop_marshal_bytearray( dcop_data *data, const gchar *str,  size_t size )
{
    if( !dcop_marshal_uint32( data, size ) )
	return FALSE;

    if ( str )
	return dcop_marshal_raw( data, str, size );
    else
	return TRUE;
}

gboolean dcop_demarshal_bytearray( dcop_data *data, gchar **str, size_t *size )
{
    unsigned int l = 0;
    gchar *res = 0;

    g_assert( str );

    if ( !dcop_demarshal_uint32( data, &l ) )
	return FALSE;

    if ( !dcop_data_check_size( data, l ) )
	return FALSE;

    res = (char *)g_malloc( l );
    memcpy( res, data->cur, l );
    data->cur += l;

    *str = res;
    *size = l;

    return TRUE;
}



gboolean dcop_marshal_data( dcop_data *data, dcop_data *other )
{
    if ( !dcop_marshal_uint32( data, other->size ) )
	return FALSE;

    return dcop_marshal_raw( data, other->ptr, other->size );
}

gboolean dcop_demarshal_data( dcop_data *data, dcop_data **other )
{
    dcop_data *res = dcop_data_new();
    char *tmp = 0;
    unsigned int l = 0;

    if ( !dcop_demarshal_uint32( data, &l ) )
	return FALSE;

    if ( !dcop_data_check_size( data, l ) )
	return FALSE;

    tmp = (char *)malloc( l );

    memcpy( tmp, data->cur, l );
    data->cur += l;

    dcop_data_assign( res, tmp, l );
    dcop_data_ref( res );

    *other = res;
    return True;
}

gboolean dcop_marshal_stringlist( dcop_data *data, GList *list )
{
    GList *it = g_list_first( list );

    if ( !dcop_marshal_uint32( data, g_list_length( list ) ) )
	return FALSE;

    while ( it )
    {
	if ( !dcop_marshal_string( data, (gchar *)it->data ) )
	    return FALSE;
	it = g_list_next( it );
    }
    return TRUE;
}

gboolean dcop_demarshal_stringlist( dcop_data *data, GList**list )
{
    unsigned int count = 0;
    GList *res = 0;
    unsigned int i = 0;
    gchar *str = 0;

    *list = 0;

    if ( !dcop_demarshal_uint32( data, &count ) )
	return FALSE;

    for ( i = 0; i < count; ++i )
    {
	if ( !dcop_demarshal_string( data, &str ) )
	{
	    dcop_list_free( res );
	    return FALSE;
	}
	res = g_list_append( res, str );
    }
    *list = res;
    return TRUE;
}

gboolean dcop_marshal_stringlist16( dcop_data *data, GList *list )
{
    GList *it = g_list_first( list );

    if ( !dcop_marshal_uint32( data, g_list_length( list ) ) )
	return False;

    while ( it )
    {
	if ( !dcop_marshal_string16( data, (gchar *)it->data ) )
	    return FALSE;
	it = g_list_next( it );
    }
    return TRUE;
}

gboolean dcop_demarshal_stringlist16( dcop_data *data, GList **list )
{
    unsigned int count = 0;
    GList *res = 0;
    unsigned int i = 0;
    char *str = 0;

    *list = 0;

    if ( !dcop_demarshal_uint32( data, &count ) )
	return FALSE;

    for ( i = 0; i < count; ++i )
    {
	if ( !dcop_demarshal_string16( data, &str ) )
	{
	    dcop_list_free( res );
	    return FALSE;
	}
	res = g_list_append( res, str );
    }
    *list = res;
    return TRUE;
}

void dcop_data_assign( dcop_data *data, char *d, unsigned int size )
{ 
    data->ptr = data->cur = d; 
    data->size = size; 
}

gboolean dcop_marshal_boolean( dcop_data *data, gboolean val )
{
    guint8 i = (guint8)val;
    return dcop_marshal_uint8( data, i );
}

gboolean dcop_demarshal_boolean( dcop_data *data, gboolean *val )
{
    guint8 i;
    if ( !dcop_demarshal_uint8( data, &i ) )
	return FALSE;
    *val = (gboolean)i;
    return TRUE;
}

gboolean dcop_marshal_uint8( dcop_data *data, guint8 val )
{
    return dcop_marshal_raw( data, &val, 1 );
}

gboolean dcop_demarshal_uint8( dcop_data *data, guint8 *val )
{
    if ( !dcop_data_check_size( data, 1 ) )
	return FALSE;

    *val = *data->cur++;
    return TRUE;
}

dcop_data *dcop_data_ref( dcop_data *data ) { data->ref++; return data; }
void dcop_data_deref( dcop_data *data ) { if ( !--data->ref ) dcop_data_destroy( data ); }
void dcop_data_reset( dcop_data *data ) { data->cur = data->ptr; }