/* Copyright (C) 2001-2021 Artifex Software, Inc.
   All Rights Reserved.

   This software is provided AS-IS with no warranty, either express or
   implied.

   This software is distributed under license and may not be copied,
   modified or distributed except as expressly authorized under the terms
   of the license contained in the file LICENSE in this distribution.

   Refer to licensing information at http://www.artifex.com or contact
   Artifex Software, Inc.,  1305 Grant Avenue - Suite 200, Novato,
   CA 94945, U.S.A., +1(415)492-9861, for further information.
*/


/* Client interface to Adobe Type 1 font routines */

#ifndef gstype1_INCLUDED
#  define gstype1_INCLUDED

#include "gstypes.h"
#include "gsgstate.h"
#include "gsgdata.h"
#include "gspath.h"

/* ------ Normal client interface ------ */

#define crypt_charstring_seed 4330
typedef struct gs_type1_state_s gs_type1_state;

typedef struct gs_font_type1_s gs_font_type1;
int gs_type1_interp_init(gs_type1_state * pcis, gs_gstate * pgs,
                         gx_path * ppath, const gs_log2_scale_point * pscale,
                         const gs_log2_scale_point * psubpixels, bool no_grid_fitting,
                         int paint_type, gs_font_type1 * pfont);
void gs_type1_set_callback_data(gs_type1_state *pcis, void *callback_data);
void gs_type1_set_lsb(gs_type1_state * pcis, const gs_point * psbpt);
void gs_type1_set_width(gs_type1_state * pcis, const gs_point * pwpt);

/* Backward compatibility */
#define gs_type1_init(pcis, penum, psbpt, charpath_flag, paint_type, pfont)\
  (gs_type1_interp_init(pcis, (gs_gstate *)((penum)->pgs),\
                        (penum)->pgs->path, &(penum)->log2_current_scale,\
                        charpath_flag, paint_type, pfont) |\
   ((psbpt) == 0 ? 0 : (gs_type1_set_lsb(pcis, psbpt), 0)))
/*
 * Continue interpreting a (Type 1) CharString.  If str != 0, it is taken as
 * the byte string to interpret.  Return 0 on successful completion, <0 on
 * error, or >0 when client intervention is required (or allowed).  The int*
 * argument is where the othersubr # is stored for callothersubr.
 */
#define type1_result_sbw 1	/* allow intervention after [h]sbw */
#define type1_result_callothersubr 2

/* Define the generic procedure type for a CharString interpreter. */
#define charstring_interpret_proc(proc)\
  int proc(gs_type1_state *, const gs_glyph_data_t *, int *)
typedef charstring_interpret_proc((*charstring_interpret_proc_t));

/* Define the Type 1 interpreter. */
charstring_interpret_proc(gs_type1_interpret);
/* Define the Type 2 interpreter. */
charstring_interpret_proc(gs_type2_interpret);

/* ------ CharString number representation ------ */

/* Define the representation of integers used by both Type 1 and Type 2. */
typedef enum {

    /* Values from 32 to 246 represent small integers. */
    c_num1 = 32,
#define c_value_num1(ch) ((int)(byte)(ch) - 139)

    /* The next 4 values represent 2-byte positive integers. */
    c_pos2_0 = 247,
    c_pos2_1 = 248,
    c_pos2_2 = 249,
    c_pos2_3 = 250,
#define c_value_pos2(c1,c2)\
  (((int)(byte)((c1) - (int)c_pos2_0) << 8) + (int)(byte)(c2) + 108)

    /* The next 4 values represent 2-byte negative integers. */
    c_neg2_0 = 251,
    c_neg2_1 = 252,
    c_neg2_2 = 253,
    c_neg2_3 = 254
#define c_value_neg2(c1,c2)\
  -(((int)(byte)((c1) - (int)c_neg2_0) << 8) + (int)(byte)(c2) + 108)

} char_num_command;

/* ------ Type 1 & Type 2 CharString representation ------ */

/*
 * We define both the Type 1 and Type 2 operators here, because they
 * overlap so much.
 */
typedef enum {

    /* Commands with identical functions in Type 1 and Type 2 */
    /* charstrings. */

    c_undef0 = 0,
    c_undef2 = 2,
    c_callsubr = 10,
    c_return = 11,
    c_undoc15 = 15,		/* An obsolete and undocumented */
    /* command used in some very old */
    /* Adobe fonts. */
    c_undef17 = 17,

    /* Commands with similar but not identical functions */
    /* in Type 1 and Type 2 charstrings. */

    cx_hstem = 1,
    cx_vstem = 3,
    cx_vmoveto = 4,
    cx_rlineto = 5,
    cx_hlineto = 6,
    cx_vlineto = 7,
    cx_rrcurveto = 8,
    cx_escape = 12,		/* extends the command set */
    cx_endchar = 14,
    cx_rmoveto = 21,
    cx_hmoveto = 22,
    cx_vhcurveto = 30,
    cx_hvcurveto = 31,

    cx_num4 = 255,		/* 4-byte numbers */

    /* Commands recognized only in Type 1 charstrings. */

    c1_closepath = 9,
    c1_hsbw = 13,

    /* Commands not recognized in Type 1 charstrings. */

#define case_c1_undefs\
        case 16: case 18: case 19:\
        case 20: case 23: case 24:\
        case 25: case 26: case 27: case 28: case 29

    /* Commands only recognized in Type 2 charstrings. */

    c2_blend = 16,
    c2_hstemhm = 18,
    c2_hintmask = 19,
    c2_cntrmask = 20,
    c2_vstemhm = 23,
    c2_rcurveline = 24,
    c2_rlinecurve = 25,
    c2_vvcurveto = 26,
    c2_hhcurveto = 27,
    c2_shortint = 28,
    c2_callgsubr = 29

    /* Commands not recognized in Type 2 charstrings. */

#define case_c2_undefs\
        case 9: case 13

} char_command;

#define char1_command_names\
  0, "hstem", 0, "vstem", "vmoveto",\
  "rlineto", "hlineto", "vlineto", "rrcurveto", "closepath",\
  "callsubr", "return", "(escape)", "hsbw", "endchar",\
  "undoc15", 0, 0, 0, 0,\
  0, "rmoveto", "hmoveto", 0, 0,\
  0, 0, 0, 0, 0,\
  "vhcurveto", "hvcurveto"
#define char2_command_names\
  0, "hstem", 0, "vstem", "vmoveto",\
  "rlineto", "hlineto", "vlineto", "rrcurveto", 0,\
  "callsubr", "return", "(escape)", 0, "endchar",\
  "undoc15", "blend", 0, "hstemhm", "hintmask",\
  "cntrmask", "rmoveto", "hmoveto", "vstemhm", "rcurveline",\
  "rlinecurve", "vvcurveto", "hhcurveto", "shortint", "callgsubr",\
  "vhcurveto", "hvcurveto"

/*
 * Extended (escape) commands in Type 1 charstrings.
 */
typedef enum {
    ce1_dotsection = 0,
    ce1_vstem3 = 1,
    ce1_hstem3 = 2,
    ce1_seac = 6,
    ce1_sbw = 7,
    ce1_div = 12,
    ce1_undoc15 = 15,		/* An obsolete and undocumented */
    /* command used in some very old */
    /* Adobe fonts. */
    ce1_callothersubr = 16,
    ce1_pop = 17,
    ce1_setcurrentpoint = 33
} char1_extended_command;

#define char1_extended_command_count 34
#define char1_extended_command_names\
  "dotsection", "vstem3", "hstem3", 0, 0,\
  0, "seac", "sbw", 0, 0,\
  0, 0, "div", 0, 0,\
  "undoc15", "callothersubr", "pop", 0, 0,\
  0, 0, 0, 0, 0,\
  0, 0, 0, 0, 0,\
  0, 0, 0, "setcurrentpoint"

/*
 * Extended (escape) commands in Type 2 charstrings.
 */
typedef enum {
    ce2_and = 3,
    ce2_or = 4,
    ce2_not = 5,
    ce2_store = 8,
    ce2_abs = 9,
    ce2_add = 10,
    ce2_sub = 11,
    ce2_div = 12,		/* same as ce1_div */
    ce2_load = 13,
    ce2_neg = 14,
    ce2_eq = 15,
    ce2_drop = 18,
    ce2_put = 20,
    ce2_get = 21,
    ce2_ifelse = 22,
    ce2_random = 23,
    ce2_mul = 24,
    ce2_sqrt = 26,
    ce2_dup = 27,
    ce2_exch = 28,
    ce2_index = 29,
    ce2_roll = 30,
    ce2_hflex = 34,
    ce2_flex = 35,
    ce2_hflex1 = 36,
    ce2_flex1 = 37
} char2_extended_command;

#define char2_extended_command_count 38
#define char2_extended_command_names\
  0, 0, 0, "and", "or",\
  "not", 0, 0, "store", "abs",\
  "add", "sub", "div", "load", "neg",\
  "eq", 0, 0, "drop", 0,\
  "put", "get", "ifelse", "random", "mul",\
  0, "sqrt", "dup", "exch", "index",\
  "roll", 0, 0, 0, "hflex",\
  "flex", "hflex1", "flex1"

#endif /* gstype1_INCLUDED */
