/* Copyright (C) 1993, 1994, 1998 Aladdin Enterprises.  All rights reserved.
  
  This file is part of AFPL Ghostscript.
  
  AFPL Ghostscript is distributed with NO WARRANTY OF ANY KIND.  No author or
  distributor accepts any responsibility for the consequences of using it, or
  for whether it serves any particular purpose or works at all, unless he or
  she says so in writing.  Refer to the Aladdin Free Public License (the
  "License") for full details.
  
  Every copy of AFPL Ghostscript must include a copy of the License, normally
  in a plain ASCII text file named PUBLIC.  The License grants you the right
  to copy, modify and redistribute AFPL Ghostscript, but only under certain
  conditions described in the License.  Among other things, the License
  requires that the copyright notice and this notice be preserved on all
  copies.
*/

/*$Id: iutil2.c,v 1.2.6.1 2002/01/25 06:33:09 rayjj Exp $ */
/* Level 2 utilities for Ghostscript interpreter */
#include "memory_.h"
#include "string_.h"
#include "ghost.h"
#include "errors.h"
#include "opcheck.h"
#include "gsparam.h"
#include "gsutil.h"		/* bytes_compare prototype */
#include "idict.h"
#include "imemory.h"		/* for iutil.h */
#include "iutil.h"
#include "iutil2.h"

/* ------ Password utilities ------ */

/* Read a password from a parameter list. */
/* Return 0 if present, 1 if absent, or an error code. */
int
param_read_password(gs_param_list * plist, const char *kstr, password * ppass)
{
    gs_param_string ps;
    long ipass;
    int code;

    ps.data = (const byte *)ppass->data, ps.size = ppass->size,
	ps.persistent = false;
    code = param_read_string(plist, kstr, &ps);
    switch (code) {
	case 0:		/* OK */
	    if (ps.size > MAX_PASSWORD)
		return_error(e_limitcheck);
	    /* Copy the data back. */
	    memcpy(ppass->data, ps.data, ps.size);
	    ppass->size = ps.size;
	    return 0;
	case 1:		/* key is missing */
	    return 1;
    }
    /* We might have gotten a typecheck because */
    /* the supplied password was an integer. */
    if (code != e_typecheck)
	return code;
    code = param_read_long(plist, kstr, &ipass);
    if (code != 0)		/* error or missing */
	return code;
    sprintf((char *)ppass->data, "%ld", ipass);
    ppass->size = strlen((char *)ppass->data);
    return 0;
}
/* Write a password to a parameter list. */
int
param_write_password(gs_param_list * plist, const char *kstr,
		     const password * ppass)
{
    gs_param_string ps;

    ps.data = (const byte *)ppass->data, ps.size = ppass->size,
	ps.persistent = false;
    if (ps.size > MAX_PASSWORD)
	return_error(e_limitcheck);
    return param_write_string(plist, kstr, &ps);
}

/* Check a password from a parameter list. */
/* Return 0 if OK, 1 if not OK, or an error code. */
int
param_check_password(gs_param_list * plist, const password * ppass)
{
    if (ppass->size != 0) {
	password pass;
	int code = param_read_password(plist, "Password", &pass);

	if (code)
	    return code;
	if (pass.size != ppass->size ||
	    bytes_compare(&pass.data[0], pass.size,
			  &ppass->data[0],
			  ppass->size) != 0
	    )
	    return 1;
    }
    return 0;
}

/* Read a password from, or write a password into, a dictionary */
/* (presumably systemdict). */
private int
dict_find_password(ref ** ppvalue, const ref * pdref, const char *kstr)
{
    ref *pvalue;

    if (dict_find_string(pdref, kstr, &pvalue) <= 0)
	return_error(e_undefined);
    if (!r_has_type(pvalue, t_string) ||
	r_has_attrs(pvalue, a_read) ||
	pvalue->value.const_bytes[0] >= r_size(pvalue)
	)
	return_error(e_rangecheck);
    *ppvalue = pvalue;
    return 0;
}
int
dict_read_password(password * ppass, const ref * pdref, const char *pkey)
{
    ref *pvalue;
    int code = dict_find_password(&pvalue, pdref, pkey);

    if (code < 0)
	return code;
    if (pvalue->value.const_bytes[0] > MAX_PASSWORD)
	return_error(e_rangecheck);	/* limitcheck? */
    memcpy(ppass->data, pvalue->value.const_bytes + 1,
	   (ppass->size = pvalue->value.const_bytes[0]));
    return 0;
}
int
dict_write_password(const password * ppass, ref * pdref, const char *pkey,
			bool change_allowed)
{
    ref *pvalue;
    int code = dict_find_password(&pvalue, pdref, pkey);

    if (code < 0)
	return code;
    if (ppass->size >= r_size(pvalue))
	return_error(e_rangecheck);
    if (!change_allowed &&
    	bytes_compare(pvalue->value.bytes + 1, pvalue->value.bytes[0],
	    ppass->data, ppass->size) != 0)
	return_error(e_invalidaccess);
    memcpy(pvalue->value.bytes + 1, ppass->data,
	   (pvalue->value.bytes[0] = ppass->size));
    return 0;
}
