/* Copyright (C) 1995, 1996, 1997, 1998, 1999, 2001 Aladdin Enterprises.  All rights reserved.
  
  This software is provided AS-IS with no warranty, either express or
  implied.
  
  This software is distributed under license and may not be copied,
  modified or distributed except as expressly authorized under the terms
  of the license contained in the file LICENSE in this distribution.
  
  For more information about licensing, please refer to
  http://www.ghostscript.com/licensing/. For information on
  commercial licensing, go to http://www.artifex.com/licensing/ or
  contact Artifex Software, Inc., 101 Lucas Valley Road #110,
  San Rafael, CA  94903, U.S.A., +1(415)492-9861.
*/

/* $Id: iplugin.c,v 1.5 2004/08/04 19:36:13 stefan Exp $ */
/* Plugin manager */

#include "malloc_.h"
#include "string_.h"
#include "ghost.h"
#include "gxalloc.h"
#include "ierrors.h"
#include "ialloc.h"
#include "iplugin.h"
#include "icstate.h"

/*  Plugin list is being build in raw memory pool,
    because it is irrelevant to PS virtual memory.
    At least it must live during alloc_restore_all, allowing
    plugins to handle the finalization of objects they manage.
*/

extern_i_plugin_table();

private void *i_plugin_mem_alloc(i_plugin_client_memory *mem, unsigned int nbytes, const char *cname)
{   gs_memory_t *mem_raw = mem->client_data;
    return mem_raw->procs.alloc_bytes_immovable(mem_raw, nbytes, cname);
}

private void i_plugin_mem_free(i_plugin_client_memory *mem, void *data, const char *cname)
{   gs_memory_t *mem_raw = mem->client_data;
    mem_raw->procs.free_object(mem_raw, data, cname);
}

void i_plugin_make_memory(i_plugin_client_memory *mem, gs_memory_t *mem_raw)
{   mem->client_data = mem_raw;
    mem->alloc = i_plugin_mem_alloc;
    mem->free  = i_plugin_mem_free;
}

int i_plugin_init(i_ctx_t *i_ctx_p)
{   gs_memory_t *mem_raw = i_ctx_p->memory.current->non_gc_memory;
    const i_plugin_instantiation_proc *p = i_plugin_table;
    i_plugin_holder *h;
    int code;
    i_plugin_client_memory client_mem;
    i_plugin_make_memory(&client_mem, mem_raw);
    for (; *p != 0; p++) {
        i_plugin_instance *instance = 0;
        code = (*p)(i_ctx_p, &client_mem, &instance);
        if (code != 0)
            return code;
        h = (i_plugin_holder *)gs_alloc_bytes_immovable(mem_raw, sizeof(i_plugin_holder), "plugin_holder");
        if (h == 0)
            return_error(e_Fatal);
        h->I = instance;
        h->next = i_ctx_p->plugin_list;
        i_ctx_p->plugin_list = h;
    }
    return 0;
}

void i_plugin_finit(gs_memory_t *mem_raw, i_plugin_holder *list)
{   i_plugin_client_memory client_mem;
    i_plugin_make_memory(&client_mem, mem_raw);
    while (list != 0) {
        i_plugin_holder *h = list;
        list = h->next;
        h->I->d->finit(h->I, &client_mem);
        gs_free_object(mem_raw, h, "plugin_holder");
    }
}

i_plugin_holder * i_plugin_get_list(i_ctx_t *i_ctx_p)
{   return i_ctx_p->plugin_list;
}

i_plugin_instance *i_plugin_find(i_ctx_t *i_ctx_p, const char *type, const char *subtype)
{   i_plugin_holder *h = i_ctx_p->plugin_list;
    for (; h != 0; h = h->next) {
        i_plugin_instance *I = h->I;
        if (!strcmp(I->d->type, type) && !strcmp(I->d->subtype, subtype))
            return I;
    }
    return NULL;
}

/* todo: define plugin enumerator by 'type' */