/* Copyright (C) 1996, 2000 Aladdin Enterprises.  All rights reserved.
  
  This file is part of GNU Ghostscript.
  
  GNU Ghostscript is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY.  No author or distributor accepts responsibility
  to anyone for the consequences of using it or for whether it serves any
  particular purpose or works at all, unless he says so in writing.  Refer
  to the GNU General Public License for full details.
  
  Everyone is granted permission to copy, modify and redistribute GNU
  Ghostscript, but only under the conditions described in the GNU General
  Public License.  A copy of this license is supposed to have been given
  to you along with GNU Ghostscript so you can know your rights and
  responsibilities.  It should be in a file named COPYING.  Among other
  things, the copyright notice and this notice must be preserved on all
  copies.
*/

/*$RCSfile: zusparam.c,v $ $Revision: 1.3.2.2 $ */
/* User and system parameter operators */
#include "memory_.h"
#include "string_.h"
#include "ghost.h"
#include "oper.h"
#include "gscdefs.h"
#include "gsstruct.h"		/* for gxht.h */
#include "gsfont.h"		/* for user params */
#include "gxht.h"		/* for user params */
#include "gsutil.h"
#include "estack.h"
#include "ialloc.h"		/* for imemory for status */
#include "icontext.h"		/* for set_user_params prototype */
#include "idict.h"
#include "idparam.h"
#include "iparam.h"
#include "dstack.h"
#include "iname.h"
#include "itoken.h"
#include "iutil2.h"
#include "ivmem2.h"
#include "store.h"

/* The (global) font directory */
extern gs_font_dir *ifont_dir;	/* in zfont.c */

/* Define an individual user or system parameter. */
/* Eventually this will be made public. */
#define param_def_common\
    const char *pname
typedef struct param_def_s {
    param_def_common;
} param_def_t;
typedef struct long_param_def_s {
    param_def_common;
    long min_value, max_value;
    long (*current)(P1(i_ctx_t *));
    int (*set)(P2(i_ctx_t *, long));
} long_param_def_t;

#if arch_sizeof_long > arch_sizeof_int
#  define MAX_UINT_PARAM max_uint
#else
#  define MAX_UINT_PARAM max_long
#endif
typedef struct bool_param_def_s {
    param_def_common;
    bool (*current)(P1(i_ctx_t *));
    int (*set)(P2(i_ctx_t *, bool));
} bool_param_def_t;
typedef struct string_param_def_s {
    param_def_common;
    void (*current)(P2(i_ctx_t *, gs_param_string *));
    int (*set)(P2(i_ctx_t *, gs_param_string *));
} string_param_def_t;

/* Define a parameter set (user or system). */
typedef struct param_set_s {
    const long_param_def_t *long_defs;
    uint long_count;
    const bool_param_def_t *bool_defs;
    uint bool_count;
    const string_param_def_t *string_defs;
    uint string_count;
} param_set;

/* Forward references */
private int setparams(P3(i_ctx_t *, gs_param_list *, const param_set *));
private int currentparams(P2(i_ctx_t *, const param_set *));
private int currentparam1(P2(i_ctx_t *, const param_set *));

/* ------ Passwords ------ */

/* <string|int> .checkpassword <0|1|2> */
private int
zcheckpassword(i_ctx_t *i_ctx_p)
{
    os_ptr op = osp;
    ref params[2];
    array_param_list list;
    gs_param_list *const plist = (gs_param_list *)&list;
    int result = 0;
    int code = name_ref((const byte *)"Password", 8, &params[0], 0);
    password pass;

    if (code < 0)
	return code;
    params[1] = *op;
    array_param_list_read(&list, params, 2, NULL, false, iimemory);
    if (dict_read_password(&pass, systemdict, "StartJobPassword") >= 0 &&
	param_check_password(plist, &pass) == 0
	)
	result = 1;
    if (dict_read_password(&pass, systemdict, "SystemParamsPassword") >= 0 &&
	param_check_password(plist, &pass) == 0
	)
	result = 2;
    iparam_list_release(&list);
    make_int(op, result);
    return 0;
}

/* ------ System parameters ------ */

/* Integer values */
private long
current_BuildTime(i_ctx_t *i_ctx_p)
{
    return gs_buildtime;
}
private long
current_MaxFontCache(i_ctx_t *i_ctx_p)
{
    return gs_currentcachesize(ifont_dir);
}
private int
set_MaxFontCache(i_ctx_t *i_ctx_p, long val)
{
    return gs_setcachesize(ifont_dir,
			   (uint)(val < 0 ? 0 : val > max_uint ? max_uint :
				   val));
}
private long
current_CurFontCache(i_ctx_t *i_ctx_p)
{
    uint cstat[7];

    gs_cachestatus(ifont_dir, cstat);
    return cstat[0];
}
private long
current_MaxGlobalVM(i_ctx_t *i_ctx_p)
{
    gs_memory_gc_status_t stat;

    gs_memory_gc_status(iimemory_global, &stat);
    return stat.max_vm;
}
private int
set_MaxGlobalVM(i_ctx_t *i_ctx_p, long val)
{
    gs_memory_gc_status_t stat;

    gs_memory_gc_status(iimemory_global, &stat);
    stat.max_vm = max(val, 0);
    gs_memory_set_gc_status(iimemory_global, &stat);
    return 0;
}
private long
current_Revision(i_ctx_t *i_ctx_p)
{
    return gs_revision;
}
private const long_param_def_t system_long_params[] =
{
    {"BuildTime", min_long, max_long, current_BuildTime, NULL},
{"MaxFontCache", 0, MAX_UINT_PARAM, current_MaxFontCache, set_MaxFontCache},
    {"CurFontCache", 0, MAX_UINT_PARAM, current_CurFontCache, NULL},
    {"Revision", min_long, max_long, current_Revision, NULL},
    /* Extensions */
    {"MaxGlobalVM", 0, max_long, current_MaxGlobalVM, set_MaxGlobalVM}
};

/* Boolean values */
private bool
current_ByteOrder(i_ctx_t *i_ctx_p)
{
    return !arch_is_big_endian;
}
private const bool_param_def_t system_bool_params[] =
{
    {"ByteOrder", current_ByteOrder, NULL}
};

/* String values */
private void
current_RealFormat(i_ctx_t *i_ctx_p, gs_param_string * pval)
{
#if arch_floats_are_IEEE
    static const char *const rfs = "IEEE";
#else
    static const char *const rfs = "not IEEE";
#endif

    pval->data = (const byte *)rfs;
    pval->size = strlen(rfs);
    pval->persistent = true;
}
private const string_param_def_t system_string_params[] =
{
    {"RealFormat", current_RealFormat, NULL}
};

/* The system parameter set */
private const param_set system_param_set =
{
    system_long_params, countof(system_long_params),
    system_bool_params, countof(system_bool_params),
    system_string_params, countof(system_string_params)
};

/* <dict> .setsystemparams - */
private int
zsetsystemparams(i_ctx_t *i_ctx_p)
{
    os_ptr op = osp;
    int code;
    dict_param_list list;
    gs_param_list *const plist = (gs_param_list *)&list;
    password pass;

    check_type(*op, t_dictionary);
    code = dict_param_list_read(&list, op, NULL, false, iimemory);
    if (code < 0)
	return code;
    code = dict_read_password(&pass, systemdict, "SystemParamsPassword");
    if (code < 0)
	return code;
    code = param_check_password(plist, &pass);
    if (code != 0) {
	if (code > 0)
	    code = gs_note_error(e_invalidaccess);
	goto out;
    }
    code = param_read_password(plist, "StartJobPassword", &pass);
    switch (code) {
	default:		/* invalid */
	    goto out;
	case 1:		/* missing */
	    break;
	case 0:
	    code = dict_write_password(&pass, systemdict,
				       "StartJobPassword",
				       ! i_ctx_p->LockFilePermissions);
	    if (code < 0)
		goto out;
    }
    code = param_read_password(plist, "SystemParamsPassword", &pass);
    switch (code) {
	default:		/* invalid */
	    goto out;
	case 1:		/* missing */
	    break;
	case 0:
	    code = dict_write_password(&pass, systemdict,
				       "SystemParamsPassword",
				       ! i_ctx_p->LockFilePermissions);
	    if (code < 0)
		goto out;
    }
    code = setparams(i_ctx_p, plist, &system_param_set);
  out:
    iparam_list_release(&list);
    if (code < 0)
	return code;
    pop(1);
    return 0;
}

/* - .currentsystemparams <name1> <value1> ... */
private int
zcurrentsystemparams(i_ctx_t *i_ctx_p)
{
    return currentparams(i_ctx_p, &system_param_set);
}

/* <name> .getsystemparam <value> */
private int
zgetsystemparam(i_ctx_t *i_ctx_p)
{
    return currentparam1(i_ctx_p, &system_param_set);
}

/* ------ User parameters ------ */

/* Integer values */
private long
current_JobTimeout(i_ctx_t *i_ctx_p)
{
    return 0;
}
private int
set_JobTimeout(i_ctx_t *i_ctx_p, long val)
{
    return 0;
}
private long
current_MaxFontItem(i_ctx_t *i_ctx_p)
{
    return gs_currentcacheupper(ifont_dir);
}
private int
set_MaxFontItem(i_ctx_t *i_ctx_p, long val)
{
    return gs_setcacheupper(ifont_dir, val);
}
private long
current_MinFontCompress(i_ctx_t *i_ctx_p)
{
    return gs_currentcachelower(ifont_dir);
}
private int
set_MinFontCompress(i_ctx_t *i_ctx_p, long val)
{
    return gs_setcachelower(ifont_dir, val);
}
private long
current_MaxOpStack(i_ctx_t *i_ctx_p)
{
    return ref_stack_max_count(&o_stack);
}
private int
set_MaxOpStack(i_ctx_t *i_ctx_p, long val)
{
    return ref_stack_set_max_count(&o_stack, val);
}
private long
current_MaxDictStack(i_ctx_t *i_ctx_p)
{
    return ref_stack_max_count(&d_stack);
}
private int
set_MaxDictStack(i_ctx_t *i_ctx_p, long val)
{
    return ref_stack_set_max_count(&d_stack, val);
}
private long
current_MaxExecStack(i_ctx_t *i_ctx_p)
{
    return ref_stack_max_count(&e_stack);
}
private int
set_MaxExecStack(i_ctx_t *i_ctx_p, long val)
{
    return ref_stack_set_max_count(&e_stack, val);
}
private long
current_MaxLocalVM(i_ctx_t *i_ctx_p)
{
    gs_memory_gc_status_t stat;

    gs_memory_gc_status(iimemory_local, &stat);
    return stat.max_vm;
}
private int
set_MaxLocalVM(i_ctx_t *i_ctx_p, long val)
{
    gs_memory_gc_status_t stat;

    gs_memory_gc_status(iimemory_local, &stat);
    stat.max_vm = max(val, 0);
    gs_memory_set_gc_status(iimemory_local, &stat);
    return 0;
}
private long
current_VMReclaim(i_ctx_t *i_ctx_p)
{
    gs_memory_gc_status_t gstat, lstat;

    gs_memory_gc_status(iimemory_global, &gstat);
    gs_memory_gc_status(iimemory_local, &lstat);
    return (!gstat.enabled ? -2 : !lstat.enabled ? -1 : 0);
}
private long
current_VMThreshold(i_ctx_t *i_ctx_p)
{
    gs_memory_gc_status_t stat;

    gs_memory_gc_status(iimemory_local, &stat);
    return stat.vm_threshold;
}
private long
current_WaitTimeout(i_ctx_t *i_ctx_p)
{
    return 0;
}
private int
set_WaitTimeout(i_ctx_t *i_ctx_p, long val)
{
    return 0;
}
private long
current_MinScreenLevels(i_ctx_t *i_ctx_p)
{
    return gs_currentminscreenlevels();
}
private int
set_MinScreenLevels(i_ctx_t *i_ctx_p, long val)
{
    gs_setminscreenlevels((uint) val);
    return 0;
}
private const long_param_def_t user_long_params[] =
{
    {"JobTimeout", 0, MAX_UINT_PARAM,
     current_JobTimeout, set_JobTimeout},
    {"MaxFontItem", 0, MAX_UINT_PARAM,
     current_MaxFontItem, set_MaxFontItem},
    {"MinFontCompress", 0, MAX_UINT_PARAM,
     current_MinFontCompress, set_MinFontCompress},
    {"MaxOpStack", 0, MAX_UINT_PARAM,
     current_MaxOpStack, set_MaxOpStack},
    {"MaxDictStack", 0, MAX_UINT_PARAM,
     current_MaxDictStack, set_MaxDictStack},
    {"MaxExecStack", 0, MAX_UINT_PARAM,
     current_MaxExecStack, set_MaxExecStack},
    {"MaxLocalVM", 0, max_long,
     current_MaxLocalVM, set_MaxLocalVM},
    {"VMReclaim", -2, 0,
     current_VMReclaim, set_vm_reclaim},
    {"VMThreshold", -1, max_long,
     current_VMThreshold, set_vm_threshold},
    {"WaitTimeout", 0, MAX_UINT_PARAM,
     current_WaitTimeout, set_WaitTimeout},
    /* Extensions */
    {"MinScreenLevels", 0, MAX_UINT_PARAM,
     current_MinScreenLevels, set_MinScreenLevels}
};

/* Boolean values */
private bool
current_AccurateScreens(i_ctx_t *i_ctx_p)
{
    return gs_currentaccuratescreens();
}
private int
set_AccurateScreens(i_ctx_t *i_ctx_p, bool val)
{
    gs_setaccuratescreens(val);
    return 0;
}

private bool
current_LockFilePermissions(i_ctx_t *i_ctx_p)
{
    return i_ctx_p->LockFilePermissions;
}
private int
set_LockFilePermissions(i_ctx_t *i_ctx_p, bool val)
{
    /* allow locking even if already locked */
    if (i_ctx_p->LockFilePermissions && !val)
	return_error(e_invalidaccess);
    i_ctx_p->LockFilePermissions = val;
    return 0;
}

private const bool_param_def_t user_bool_params[] =
{
    {"AccurateScreens", current_AccurateScreens, set_AccurateScreens},
    {"LockFilePermissions", current_LockFilePermissions, set_LockFilePermissions}
};

/* The user parameter set */
private const param_set user_param_set =
{
    user_long_params, countof(user_long_params),
    user_bool_params, countof(user_bool_params),
    0, 0
};

/* <dict> .setuserparams - */
/* We break this out for use when switching contexts. */
int
set_user_params(i_ctx_t *i_ctx_p, const ref *paramdict)
{
    dict_param_list list;
    int code;

    check_type(*paramdict, t_dictionary);
    code = dict_param_list_read(&list, paramdict, NULL, false, iimemory);
    if (code < 0)
	return code;
    code = setparams(i_ctx_p, (gs_param_list *)&list, &user_param_set);
    iparam_list_release(&list);
    return code;
}
private int
zsetuserparams(i_ctx_t *i_ctx_p)
{
    os_ptr op = osp;
    int code = set_user_params(i_ctx_p, op);

    if (code >= 0) {
	/* Update cached scanner options. */
	i_ctx_p->scanner_options =
	    ztoken_scanner_options(op, i_ctx_p->scanner_options);
	pop(1);
    }
    return code;
}

/* - .currentuserparams <name1> <value1> ... */
private int
zcurrentuserparams(i_ctx_t *i_ctx_p)
{
    return currentparams(i_ctx_p, &user_param_set);
}

/* <name> .getuserparam <value> */
private int
zgetuserparam(i_ctx_t *i_ctx_p)
{
    return currentparam1(i_ctx_p, &user_param_set);
}

/* ------ Initialization procedure ------ */

const op_def zusparam_op_defs[] =
{
	/* User and system parameters are accessible even in Level 1 */
	/* (if this is a Level 2 system). */
    {"0.currentsystemparams", zcurrentsystemparams},
    {"0.currentuserparams", zcurrentuserparams},
    {"1.getsystemparam", zgetsystemparam},
    {"1.getuserparam", zgetuserparam},
    {"1.setsystemparams", zsetsystemparams},
    {"1.setuserparams", zsetuserparams},
	/* The rest of the operators are defined only in Level 2. */
    op_def_begin_level2(),
    {"1.checkpassword", zcheckpassword},
    op_def_end(0)
};

/* ------ Internal procedures ------ */

/* Set the values of a parameter set from a parameter list. */
/* We don't attempt to back out if anything fails. */
private int
setparams(i_ctx_t *i_ctx_p, gs_param_list * plist, const param_set * pset)
{
    int i, code;

    for (i = 0; i < pset->long_count; i++) {
	const long_param_def_t *pdef = &pset->long_defs[i];
	long val;

	if (pdef->set == NULL)
	    continue;
	code = param_read_long(plist, pdef->pname, &val);
	switch (code) {
	    default:		/* invalid */
		return code;
	    case 1:		/* missing */
		break;
	    case 0:
		if (val < pdef->min_value || val > pdef->max_value)
		    return_error(e_rangecheck);
		code = (*pdef->set)(i_ctx_p, val);
		if (code < 0)
		    return code;
	}
    }
    for (i = 0; i < pset->bool_count; i++) {
	const bool_param_def_t *pdef = &pset->bool_defs[i];
	bool val;

	if (pdef->set == NULL)
	    continue;
	code = param_read_bool(plist, pdef->pname, &val);
	if (code == 0)
	    code = (*pdef->set)(i_ctx_p, val);
	if (code < 0)
	    return code;
    }
/****** WE SHOULD DO STRINGS AND STRING ARRAYS, BUT WE DON'T YET ******/
    return 0;
}

/* Get the current values of a parameter set to the stack. */
private bool
pname_matches(const char *pname, const ref * psref)
{
    return
	(psref == 0 ||
	 !bytes_compare((const byte *)pname, strlen(pname),
			psref->value.const_bytes, r_size(psref)));
}
private int
current_param_list(i_ctx_t *i_ctx_p, const param_set * pset,
		   const ref * psref /*t_string */ )
{
    stack_param_list list;
    gs_param_list *const plist = (gs_param_list *)&list;
    int i;

    stack_param_list_write(&list, &o_stack, NULL, iimemory);
    for (i = 0; i < pset->long_count; i++) {
	const char *pname = pset->long_defs[i].pname;

	if (pname_matches(pname, psref)) {
	    long val = (*pset->long_defs[i].current)(i_ctx_p);
	    int code = param_write_long(plist, pname, &val);

	    if (code < 0)
		return code;
	}
    }
    for (i = 0; i < pset->bool_count; i++) {
	const char *pname = pset->bool_defs[i].pname;

	if (pname_matches(pname, psref)) {
	    bool val = (*pset->bool_defs[i].current)(i_ctx_p);
	    int code = param_write_bool(plist, pname, &val);

	    if (code < 0)
		return code;
	}
    }
    for (i = 0; i < pset->string_count; i++) {
	const char *pname = pset->string_defs[i].pname;

	if (pname_matches(pname, psref)) {
	    gs_param_string val;
	    int code;

	    (*pset->string_defs[i].current)(i_ctx_p, &val);
	    code = param_write_string(plist, pname, &val);
	    if (code < 0)
		return code;
	}
    }
    return 0;
}

/* Get the current values of a parameter set to the stack. */
private int
currentparams(i_ctx_t *i_ctx_p, const param_set * pset)
{
    return current_param_list(i_ctx_p, pset, NULL);
}

/* Get the value of a single parameter to the stack, or signal an error. */
private int
currentparam1(i_ctx_t *i_ctx_p, const param_set * pset)
{
    os_ptr op = osp;
    ref sref;
    int code;

    check_type(*op, t_name);
    check_ostack(2);
    name_string_ref((const ref *)op, &sref);
    code = current_param_list(i_ctx_p, pset, &sref);
    if (code < 0)
	return code;
    if (osp == op)
	return_error(e_undefined);
    /* We know osp == op + 2. */
    ref_assign(op, op + 2);
    pop(2);
    return code;
}
