psaux.h

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/***************************************************************************/
/*                                                                         */
/*  psaux.h                                                                */
/*                                                                         */
/*    Auxiliary functions and data structures related to PostScript fonts  */
/*    (specification).                                                     */
/*                                                                         */
/*  Copyright 1996-2001, 2002, 2003, 2004, 2006, 2008, 2009 by             */
/*  David Turner, Robert Wilhelm, and Werner Lemberg.                      */
/*                                                                         */
/*  This file is part of the FreeType project, and may only be used,       */
/*  modified, and distributed under the terms of the FreeType project      */
/*  license, LICENSE.TXT.  By continuing to use, modify, or distribute     */
/*  this file you indicate that you have read the license and              */
/*  understand and accept it fully.                                        */
/*                                                                         */
/***************************************************************************/


#ifndef __PSAUX_H__
#define __PSAUX_H__


#include <ft2build.h>
#include FT_INTERNAL_OBJECTS_H
#include FT_INTERNAL_TYPE1_TYPES_H
#include FT_SERVICE_POSTSCRIPT_CMAPS_H


FT_BEGIN_HEADER


  /*************************************************************************/
  /*************************************************************************/
  /*****                                                               *****/
  /*****                             T1_TABLE                          *****/
  /*****                                                               *****/
  /*************************************************************************/
  /*************************************************************************/


  typedef struct PS_TableRec_*              PS_Table;
  typedef const struct PS_Table_FuncsRec_*  PS_Table_Funcs;


  /*************************************************************************/
  /*                                                                       */
  /* <Struct>                                                              */
  /*    PS_Table_FuncsRec                                                  */
  /*                                                                       */
  /* <Description>                                                         */
  /*    A set of function pointers to manage PS_Table objects.             */
  /*                                                                       */
  /* <Fields>                                                              */
  /*    table_init    :: Used to initialize a table.                       */
  /*                                                                       */
  /*    table_done    :: Finalizes resp. destroy a given table.            */
  /*                                                                       */
  /*    table_add     :: Adds a new object to a table.                     */
  /*                                                                       */
  /*    table_release :: Releases table data, then finalizes it.           */
  /*                                                                       */
  typedef struct  PS_Table_FuncsRec_
  {
    FT_Error
    (*init)( PS_Table   table,
             FT_Int     count,
             FT_Memory  memory );

    void
    (*done)( PS_Table  table );

    FT_Error
    (*add)( PS_Table    table,
            FT_Int      idx,
            void*       object,
            FT_PtrDist  length );

    void
    (*release)( PS_Table  table );

  } PS_Table_FuncsRec;


  /*************************************************************************/
  /*                                                                       */
  /* <Struct>                                                              */
  /*    PS_TableRec                                                        */
  /*                                                                       */
  /* <Description>                                                         */
  /*    A PS_Table is a simple object used to store an array of objects in */
  /*    a single memory block.                                             */
  /*                                                                       */
  /* <Fields>                                                              */
  /*    block     :: The address in memory of the growheap's block.  This  */
  /*                 can change between two object adds, due to            */
  /*                 reallocation.                                         */
  /*                                                                       */
  /*    cursor    :: The current top of the grow heap within its block.    */
  /*                                                                       */
  /*    capacity  :: The current size of the heap block.  Increments by    */
  /*                 1kByte chunks.                                        */
  /*                                                                       */
  /*    max_elems :: The maximum number of elements in table.              */
  /*                                                                       */
  /*    num_elems :: The current number of elements in table.              */
  /*                                                                       */
  /*    elements  :: A table of element addresses within the block.        */
  /*                                                                       */
  /*    lengths   :: A table of element sizes within the block.            */
  /*                                                                       */
  /*    memory    :: The object used for memory operations                 */
  /*                 (alloc/realloc).                                      */
  /*                                                                       */
  /*    funcs     :: A table of method pointers for this object.           */
  /*                                                                       */
  typedef struct  PS_TableRec_
  {
    FT_Byte*           block;          /* current memory block           */
    FT_Offset          cursor;         /* current cursor in memory block */
    FT_Offset          capacity;       /* current size of memory block   */
    FT_Long            init;

    FT_Int             max_elems;
    FT_Int             num_elems;
    FT_Byte**          elements;       /* addresses of table elements */
    FT_PtrDist*        lengths;        /* lengths of table elements   */

    FT_Memory          memory;
    PS_Table_FuncsRec  funcs;

  } PS_TableRec;


  /*************************************************************************/
  /*************************************************************************/
  /*****                                                               *****/
  /*****                       T1 FIELDS & TOKENS                      *****/
  /*****                                                               *****/
  /*************************************************************************/
  /*************************************************************************/

  typedef struct PS_ParserRec_*  PS_Parser;

  typedef struct T1_TokenRec_*   T1_Token;

  typedef struct T1_FieldRec_*   T1_Field;


  /* simple enumeration type used to identify token types */
  typedef enum  T1_TokenType_
  {
    T1_TOKEN_TYPE_NONE = 0,
    T1_TOKEN_TYPE_ANY,
    T1_TOKEN_TYPE_STRING,
    T1_TOKEN_TYPE_ARRAY,
    T1_TOKEN_TYPE_KEY, /* aka `name' */

    /* do not remove */
    T1_TOKEN_TYPE_MAX

  } T1_TokenType;


  /* a simple structure used to identify tokens */
  typedef struct  T1_TokenRec_
  {
    FT_Byte*      start;   /* first character of token in input stream */
    FT_Byte*      limit;   /* first character after the token          */
    T1_TokenType  type;    /* type of token                            */

  } T1_TokenRec;


  /* enumeration type used to identify object fields */
  typedef enum  T1_FieldType_
  {
    T1_FIELD_TYPE_NONE = 0,
    T1_FIELD_TYPE_BOOL,
    T1_FIELD_TYPE_INTEGER,
    T1_FIELD_TYPE_FIXED,
    T1_FIELD_TYPE_FIXED_1000,
    T1_FIELD_TYPE_STRING,
    T1_FIELD_TYPE_KEY,
    T1_FIELD_TYPE_BBOX,
    T1_FIELD_TYPE_INTEGER_ARRAY,
    T1_FIELD_TYPE_FIXED_ARRAY,
    T1_FIELD_TYPE_CALLBACK,

    /* do not remove */
    T1_FIELD_TYPE_MAX

  } T1_FieldType;


  typedef enum  T1_FieldLocation_
  {
    T1_FIELD_LOCATION_CID_INFO,
    T1_FIELD_LOCATION_FONT_DICT,
    T1_FIELD_LOCATION_FONT_INFO,
    T1_FIELD_LOCATION_PRIVATE,
    T1_FIELD_LOCATION_BBOX,
    T1_FIELD_LOCATION_LOADER,
    T1_FIELD_LOCATION_FACE,
    T1_FIELD_LOCATION_BLEND,

    /* do not remove */
    T1_FIELD_LOCATION_MAX

  } T1_FieldLocation;


  typedef void
  (*T1_Field_ParseFunc)( FT_Face     face,
                         FT_Pointer  parser );


  /* structure type used to model object fields */
  typedef struct  T1_FieldRec_
  {
    const char*         ident;        /* field identifier               */
    T1_FieldLocation    location;
    T1_FieldType        type;         /* type of field                  */
    T1_Field_ParseFunc  reader;
    FT_UInt             offset;       /* offset of field in object      */
    FT_Byte             size;         /* size of field in bytes         */
    FT_UInt             array_max;    /* maximal number of elements for */
                                      /* array                          */
    FT_UInt             count_offset; /* offset of element count for    */
                                      /* arrays; must not be zero if in */
                                      /* use -- in other words, a       */
                                      /* `num_FOO' element must not     */
                                      /* start the used structure if we */
                                      /* parse a `FOO' array            */
    FT_UInt             dict;         /* where we expect it             */
  } T1_FieldRec;

#define T1_FIELD_DICT_FONTDICT ( 1 << 0 ) /* also FontInfo and FDArray */
#define T1_FIELD_DICT_PRIVATE  ( 1 << 1 )



#define T1_NEW_SIMPLE_FIELD( _ident, _type, _fname, _dict ) \
          {                                                 \
            _ident, T1CODE, _type,                          \
            0,                                              \
            FT_FIELD_OFFSET( _fname ),                      \
            FT_FIELD_SIZE( _fname ),                        \
            0, 0,                                           \
            _dict                                           \
          },

#define T1_NEW_CALLBACK_FIELD( _ident, _reader, _dict ) \
          {                                             \
            _ident, T1CODE, T1_FIELD_TYPE_CALLBACK,     \
            (T1_Field_ParseFunc)_reader,                \
            0, 0,                                       \
            0, 0,                                       \
            _dict                                       \
          },

#define T1_NEW_TABLE_FIELD( _ident, _type, _fname, _max, _dict ) \
          {                                                      \
            _ident, T1CODE, _type,                               \
            0,                                                   \
            FT_FIELD_OFFSET( _fname ),                           \
            FT_FIELD_SIZE_DELTA( _fname ),                       \
            _max,                                                \
            FT_FIELD_OFFSET( num_ ## _fname ),                   \
            _dict                                                \
          },

#define T1_NEW_TABLE_FIELD2( _ident, _type, _fname, _max, _dict ) \
          {                                                       \
            _ident, T1CODE, _type,                                \
            0,                                                    \
            FT_FIELD_OFFSET( _fname ),                            \
            FT_FIELD_SIZE_DELTA( _fname ),                        \
            _max, 0,                                              \
            _dict                                                 \
          },


#define T1_FIELD_BOOL( _ident, _fname, _dict )                             \
          T1_NEW_SIMPLE_FIELD( _ident, T1_FIELD_TYPE_BOOL, _fname, _dict )

#define T1_FIELD_NUM( _ident, _fname, _dict )                                 \
          T1_NEW_SIMPLE_FIELD( _ident, T1_FIELD_TYPE_INTEGER, _fname, _dict )

#define T1_FIELD_FIXED( _ident, _fname, _dict )                             \
          T1_NEW_SIMPLE_FIELD( _ident, T1_FIELD_TYPE_FIXED, _fname, _dict )