/*
   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.

   internal.h: internal C API
*/

#ifndef __INTERNAL_H__
#define __INTERNAL_H__

#include <assert.h>
#include "xds.h"

#define XDS_TRUE (1==1)
#define XDS_FALSE (1!=1)

#define XDS_INITIAL_BUFFER_CAPACITY  512
#define XDS_INITIAL_ENGINES_CAPACITY  32

typedef struct
    {
    char*        name;
    xds_engine_t engine;
    void*        context;
    }
engine_map_t;

struct xds_context
    {
    xds_mode_t mode;

    char*  buffer;
    size_t buffer_len;
    size_t buffer_capacity;
    int    we_own_buffer;

    engine_map_t* engines;
    size_t        engines_len;
    size_t        engines_capacity;
    };

int xds_find_engine(const engine_map_t* engines, size_t last, const char* name, size_t* pos);
int xds_set_capacity(void** array, size_t* array_capacity, size_t new_capacity, size_t elem_size, size_t initial_capacity);

extern const char xds_xml_begin_text[];
extern const char xds_xml_end_text[];

#define xds_check_parameter(condition)    \
    do                                    \
    {                                     \
    assert(condition);                    \
    if (!(condition))                     \
        return XDS_ERR_INVALID_ARG;       \
    } while(XDS_FALSE)

#define xds_init_encoding_engine(size)                                          \
    do                                                                          \
    {                                                                           \
    xds_check_parameter(xds != NULL);                                           \
    xds_check_parameter(buffer != NULL);                                        \
    xds_check_parameter(buffer_size != 0);                                      \
    xds_check_parameter(used_buffer_size != NULL && *used_buffer_size == 0);    \
    xds_check_parameter(args != NULL);                                          \
    *used_buffer_size = size;                                                   \
    if (buffer_size < size)                                                     \
        return XDS_ERR_OVERFLOW;                                                \
    } while(XDS_FALSE)

#define xds_init_decoding_engine(size)                                          \
    do                                                                          \
    {                                                                           \
    xds_check_parameter(xds != NULL);                                           \
    xds_check_parameter(buffer != NULL);                                        \
    xds_check_parameter(buffer_size != 0);                                      \
    xds_check_parameter(used_buffer_size != NULL && *used_buffer_size == 0);    \
    xds_check_parameter(args != NULL);                                          \
    *used_buffer_size = size;                                                   \
    if (buffer_size < size)                                                     \
        return XDS_ERR_UNDERFLOW;                                               \
    } while(XDS_FALSE)

#endif /* !defined(__INTERNAL_H__) */