ccl.h 3.89 KB
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/* Header for CCL (Code Conversion Language) interpreter.
   Copyright (C) 1995 Electrotechnical Laboratory, JAPAN.
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   Licensed to the Free Software Foundation.
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This file is part of GNU Emacs.

GNU Emacs is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
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GNU Emacs is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
along with GNU Emacs; see the file COPYING.  If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.  */
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#ifndef EMACS_CCL_H
#define EMACS_CCL_H
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/* Macros for exit status of CCL program.  */
#define CCL_STAT_SUCCESS	0 /* Terminated successfully.  */
#define CCL_STAT_SUSPEND_BY_SRC	1 /* Terminated by empty input.  */
#define CCL_STAT_SUSPEND_BY_DST	2 /* Terminated by output buffer full.  */
#define CCL_STAT_INVALID_CMD	3 /* Terminated because of invalid
				     command.  */
#define CCL_STAT_QUIT		4 /* Terminated because of quit.  */

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/* Structure to hold information about running CCL code.  Read
   comments in the file ccl.c for the detail of each field.  */
struct ccl_program {
  int size;			/* Size of the compiled code.  */
  Lisp_Object *prog;		/* Pointer into the compiled code.  */
  int ic;			/* Instruction Counter (index for PROG).  */
  int eof_ic;			/* Instruction Counter for end-of-file
				   processing code.  */
  int reg[8];			/* CCL registers, reg[7] is used for
				   condition flag of relational
				   operations.  */
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  int private_state;            /* CCL instruction may use this
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				   for private use, mainly for saving
				   internal states on suspending.
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				   This variable is set to 0 when ccl is 
				   set up.  */
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  int last_block;		/* Set to 1 while processing the last
				   block. */
  int status;			/* Exit status of the CCL program.  */
  int buf_magnification;	/* Output buffer magnification.  How
				   many times bigger the output buffer
				   should be than the input buffer.  */
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  int stack_idx;		/* How deep the call of CCL_Call is nested.  */
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  int eol_type;			/* When the CCL program is used for
				   encoding by a coding system, set to
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				   the eol_type of the coding system.
				   In other cases, always
				   CODING_EOL_LF.  */
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  int multibyte;		/* 1 if the source text is multibyte.  */
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  int cr_consumed;		/* Flag for encoding DOS-like EOL
				   format when the CCL program is used
				   for encoding by a coding
				   system.  */
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  int suppress_error;		/* If nonzero, don't insert error
				   message in the output.  */
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  int eight_bit_control;	/* Set to nonzero if CCL_WRITE_CHAR
				   writes eight-bit-control char.  */
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};

/* This data type is used for the spec field of the structure
   coding_system.  */

struct ccl_spec {
  struct ccl_program decoder;
  struct ccl_program encoder;
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  unsigned char valid_codes[256];
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  int cr_carryover;		/* CR carryover flag.  */
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  unsigned char eight_bit_carryover[MAX_MULTIBYTE_LENGTH];
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};

/* Alist of fontname patterns vs corresponding CCL program.  */
extern Lisp_Object Vfont_ccl_encoder_alist;

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/* Setup fields of the structure pointed by CCL appropriately for the
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   execution of ccl program CCL_PROG (symbol or vector).  */
extern int setup_ccl_program P_ ((struct ccl_program *, Lisp_Object));
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extern int ccl_driver P_ ((struct ccl_program *, unsigned char *,
			   unsigned char *, int, int, int *));

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/* Vector of CCL program names vs corresponding program data.  */
extern Lisp_Object Vccl_program_table;

/* Symbols of ccl program have this property, a value of the property
   is an index for Vccl_protram_table. */
extern Lisp_Object Qccl_program_idx;

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#endif /* EMACS_CCL_H */