src/ccl.h

   1 /* Header for CCL (Code Conversion Language) interpreter.
   2    Copyright (C) 1995 Electrotechnical Laboratory, JAPAN.
   3    Licensed to the Free Software Foundation.
   4
   5 This file is part of GNU Emacs.
   6
   7 GNU Emacs is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 2, or (at your option)
  10 any later version.
  11
  12 GNU Emacs is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GNU Emacs; see the file COPYING.  If not, write to
  19 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  20 Boston, MA 02111-1307, USA.  */
  21
  22 #ifndef _CCL_H
  23 #define _CCL_H
  24
  25 /* Macros for exit status of CCL program.  */
  26 #define CCL_STAT_SUCCESS        0 /* Terminated successfully.  */
  27 #define CCL_STAT_SUSPEND_BY_SRC 1 /* Terminated by empty input.  */
  28 #define CCL_STAT_SUSPEND_BY_DST 2 /* Terminated by output buffer full.  */
  29 #define CCL_STAT_INVALID_CMD    3 /* Terminated because of invalid
  30                                      command.  */
  31 #define CCL_STAT_QUIT           4 /* Terminated because of quit.  */
  32
  33 /* Structure to hold information about running CCL code.  Read
  34    comments in the file ccl.c for the detail of each field.  */
  35 struct ccl_program {
  36   int size;                     /* Size of the compiled code.  */
  37   Lisp_Object *prog;            /* Pointer into the compiled code.  */
  38   int ic;                       /* Instruction Counter (index for PROG).  */
  39   int eof_ic;                   /* Instruction Counter for end-of-file
  40                                    processing code.  */
  41   int reg[8];                   /* CCL registers, reg[7] is used for
  42                                    condition flag of relational
  43                                    operations.  */
  44   int private_state;            /* CCL instruction may use this
  45                                    for private use, mainly for preservation
  46                                    internal states for suspending.
  47                                    This variable is set to 0 when ccl is
  48                                    set up.  */
  49   int last_block;               /* Set to 1 while processing the last
  50                                    block. */
  51   int status;                   /* Exit status of the CCL program.  */
  52   int buf_magnification;        /* Output buffer magnification.  How
  53                                    many times bigger the output buffer
  54                                    should be than the input buffer.  */
  55   int stack_idx;                /* How deep the call of CCL_Call is nested.  */
  56 };
  57
  58 /* This data type is used for the spec field of the structure
  59    coding_system.  */
  60
  61 struct ccl_spec {
  62   struct ccl_program decoder;
  63   struct ccl_program encoder;
  64   unsigned char valid_codes[256];
  65 };
  66
  67 /* Alist of fontname patterns vs corresponding CCL program.  */
  68 extern Lisp_Object Vfont_ccl_encoder_alist;
  69
  70 /* Setup fields of the structure pointed by CCL appropriately for the
  71    execution of ccl program CCL_PROG (symbol or vector).  */
  72 extern int setup_ccl_program P_ ((struct ccl_program *, Lisp_Object));
  73
  74 extern int ccl_driver P_ ((struct ccl_program *, unsigned char *,
  75                            unsigned char *, int, int, int *));
  76
  77 /* Vector of CCL program names vs corresponding program data.  */
  78 extern Lisp_Object Vccl_program_table;
  79
  80 /* Symbols of ccl program have this property, a value of the property
  81    is an index for Vccl_protram_table. */
  82 extern Lisp_Object Qccl_program_idx;
  83
  84 #endif /* _CCL_H */