pstoraster/zbseq.c

   1 /* Copyright (C) 1990, 1995, 1997, 1998 Aladdin Enterprises.  All rights reserved.
   2
   3   This file is part of GNU Ghostscript.
   4
   5   GNU Ghostscript is distributed in the hope that it will be useful, but
   6   WITHOUT ANY WARRANTY.  No author or distributor accepts responsibility
   7   to anyone for the consequences of using it or for whether it serves any
   8   particular purpose or works at all, unless he says so in writing.  Refer
   9   to the GNU General Public License for full details.
  10
  11   Everyone is granted permission to copy, modify and redistribute GNU
  12   Ghostscript, but only under the conditions described in the GNU General
  13   Public License.  A copy of this license is supposed to have been given
  14   to you along with GNU Ghostscript so you can know your rights and
  15   responsibilities.  It should be in a file named COPYING.  Among other
  16   things, the copyright notice and this notice must be preserved on all
  17   copies.
  18
  19   Aladdin Enterprises supports the work of the GNU Project, but is not
  20   affiliated with the Free Software Foundation or the GNU Project.  GNU
  21   Ghostscript, as distributed by Aladdin Enterprises, does not require any
  22   GNU software to build or run it.
  23 */
  24
  25 /*$Id$ */
  26 /* Level 2 binary object sequence operators */
  27 #include "memory_.h"
  28 #include "ghost.h"
  29 #include "oper.h"
  30 #include "ialloc.h"
  31 #include "btoken.h"
  32 #include "store.h"
  33
  34 /* Current binary format (in iscan.c) */
  35 extern ref ref_binary_object_format;
  36
  37 /* System and user name arrays. */
  38 ref binary_token_names;         /* array of size 2 */
  39 private ref *const binary_token_names_p = &binary_token_names;
  40
  41 /* Import the Level 2 scanner extensions. */
  42 typedef struct scanner_state_s scanner_state;
  43 extern int scan_binary_token(P3(stream *, ref *, scanner_state *));
  44 extern int (*scan_btoken_proc) (P3(stream *, ref *, scanner_state *));
  45
  46 /* Initialize the binary token machinery. */
  47 private void
  48 zbseq_init(void)
  49 {
  50     /* Initialize fake system and user name tables. */
  51     /* PostScript code will install the real system name table. */
  52     ialloc_ref_array(&binary_token_names, 0 /*a_noaccess */ , 2,
  53                      "binary token names");
  54     make_empty_array(system_names_p, a_readonly);
  55     make_empty_array(user_names_p, a_all);
  56     gs_register_ref_root(imemory, NULL, (void **)&binary_token_names_p,
  57                          "binary token names");
  58
  59     /* Set up Level 2 scanning constants. */
  60     scan_btoken_proc = scan_binary_token;
  61 }
  62
  63 /* <names> .installsystemnames - */
  64 private int
  65 zinstallsystemnames(register os_ptr op)
  66 {
  67     if (r_space(op) != avm_global)
  68         return_error(e_invalidaccess);
  69     check_read_type(*op, t_shortarray);
  70     ref_assign_old(NULL, system_names_p, op, ".installsystemnames");
  71     pop(1);
  72     return 0;
  73 }
  74
  75 /* - currentobjectformat <int> */
  76 private int
  77 zcurrentobjectformat(register os_ptr op)
  78 {
  79     push(1);
  80     *op = ref_binary_object_format;
  81     return 0;
  82 }
  83
  84 /* <int> setobjectformat - */
  85 private int
  86 zsetobjectformat(register os_ptr op)
  87 {
  88     check_type(*op, t_integer);
  89     if (op->value.intval < 0 || op->value.intval > 4)
  90         return_error(e_rangecheck);
  91     ref_assign_old(NULL, &ref_binary_object_format, op, "setobjectformat");
  92     pop(1);
  93     return 0;
  94 }
  95
  96 /* <ref_offset> <char_offset> <obj> <string8> .bosobject */
  97 /*   <ref_offset'> <char_offset'> <string8> */
  98 /*
  99  * This converts a single object to its binary object sequence
 100  * representation, doing the dirty work of printobject and writeobject.
 101  * (The main control is in PostScript code, so that we don't have to worry
 102  * about interrupts or callouts in the middle of writing the various data
 103  * items.)  Note that this may or may not modify the 'unused' field.
 104  */
 105
 106 private int
 107 zbosobject(os_ptr op)
 108 {
 109     int code;
 110
 111     check_type(op[-3], t_integer);
 112     check_type(op[-2], t_integer);
 113     check_write_type(*op, t_string);
 114     if (r_size(op) < 8)
 115         return_error(e_rangecheck);
 116     code = encode_binary_token(op - 1, &op[-3].value.intval,
 117                                &op[-2].value.intval, op->value.bytes);
 118     if (code < 0)
 119         return code;
 120     op[-1] = *op;
 121     r_set_size(op - 1, 8);
 122     pop(1);
 123     return 0;
 124 }
 125
 126 /* ------ Initialization procedure ------ */
 127
 128 const op_def zbseq_l2_op_defs[] =
 129 {
 130     op_def_begin_level2(),
 131     {"1.installsystemnames", zinstallsystemnames},
 132     {"0currentobjectformat", zcurrentobjectformat},
 133     {"1setobjectformat", zsetobjectformat},
 134     {"4.bosobject", zbosobject},
 135     op_def_end(zbseq_init)
 136 };