kc3-lang/freetype/src/type1z/z1parse.c

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• Hash : b48a6094
  Author :
  Date : 2000-07-09T19:15:30
  

  Formatting. Moving some internal structures and constants from freetype.h to ftobjs.h. Finally removing FT_LOAD_ANTI_ALIAS. Cleaning up all error codes. Only the used ones have survived :-) Removed unused FT_MAX_GLYPH_FORMATS constant. T2 error codes are now in the range 0x500-0x5FF (instead of `TrueDoc'). Some minor improvements of error return values. Finally fixing error code values in ftraster and ftgrays to be compliant with all other FT error codes.

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• src/type1z/z1parse.c

• /***************************************************************************/
  /*                                                                         */
  /*  z1parse.c                                                              */
  /*                                                                         */
  /*    Experimental Type 1 parser (body).                                   */
  /*                                                                         */
  /*  Copyright 1996-2000 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.                                        */
  /*                                                                         */
  /***************************************************************************/
  
  
    /*************************************************************************/
    /*                                                                       */
    /* The Type 1 parser is in charge of the following:                      */
    /*                                                                       */
    /*  - provide an implementation of a growing sequence of objects called  */
    /*    a `Z1_Table' (used to build various tables needed by the loader).  */
    /*                                                                       */
    /*  - opening .pfb and .pfa files to extract their top-level and private */
    /*    dictionaries.                                                      */
    /*                                                                       */
    /*  - read numbers, arrays & strings from any dictionary.                */
    /*                                                                       */
    /* See `z1load.c' to see how data is loaded from the font file.          */
    /*                                                                       */
    /*************************************************************************/
  
  
  #include <freetype/internal/ftdebug.h>
  #include <freetype/internal/ftcalc.h>
  #include <freetype/internal/ftobjs.h>
  #include <freetype/internal/ftstream.h>
  #include <freetype/internal/t1errors.h>
  
  
  #ifdef FT_FLAT_COMPILE
  
  #include "z1parse.h"
  
  #else
  
  #include <type1z/z1parse.h>
  
  #endif
  
  
  #include <string.h>     /* for strncmp() */
  
  
    /*************************************************************************/
    /*                                                                       */
    /* The macro FT_COMPONENT is used in trace mode.  It is an implicit      */
    /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log  */
    /* messages during execution.                                            */
    /*                                                                       */
  #undef  FT_COMPONENT
  #define FT_COMPONENT  trace_z1parse
  
  
    /*************************************************************************/
    /*************************************************************************/
    /*************************************************************************/
    /*****                                                               *****/
    /*****              IMPLEMENTATION OF Z1_TABLE OBJECT                *****/
    /*****                                                               *****/
    /*************************************************************************/
    /*************************************************************************/
    /*************************************************************************/
  
  
    /*************************************************************************/
    /*                                                                       */
    /* <Function>                                                            */
    /*    Z1_New_Table                                                       */
    /*                                                                       */
    /* <Description>                                                         */
    /*    Initialises a Z1_Table.                                            */
    /*                                                                       */
    /* <InOut>                                                               */
    /*    table  :: The address of the target table.                         */
    /*                                                                       */
    /* <Input>                                                               */
    /*    count  :: The table size = the maximum number of elements.         */
    /*                                                                       */
    /*    memory :: The memory object to use for all subsequent              */
    /*              reallocations.                                           */
    /*                                                                       */
    /* <Return>                                                              */
    /*    FreeType error code.  0 means success.                             */
    /*                                                                       */
    LOCAL_FUNC
    FT_Error  Z1_New_Table( Z1_Table*  table,
                            FT_Int     count,
                            FT_Memory  memory )
    {
      FT_Error  error;
  
  
      table->memory = memory;
      if ( ALLOC_ARRAY( table->elements, count, FT_Byte*  ) ||
           ALLOC_ARRAY( table->lengths, count, FT_Byte* )   )
        goto Exit;
  
      table->max_elems = count;
      table->init      = 0xdeadbeef;
      table->num_elems = 0;
      table->block     = 0;
      table->capacity  = 0;
      table->cursor    = 0;
  
    Exit:
      if ( error )
        FREE( table->elements );
  
      return error;
    }
  
  
    static
    void  shift_elements( Z1_Table*  table,
                          FT_Byte*   old_base )
    {
      FT_Long    delta  = table->block - old_base;
      FT_Byte**  offset = table->elements;
      FT_Byte**  limit  = offset + table->max_elems;
  
  
      if ( delta )
        for ( ; offset < limit; offset++ )
        {
          if ( offset[0] )
            offset[0] += delta;
        }
    }
  
  
    static
    FT_Error  reallocate_t1_table( Z1_Table*  table,
                                   FT_Int     new_size )
    {
      FT_Memory  memory   = table->memory;
      FT_Byte*   old_base = table->block;
      FT_Error   error;
  
  
      /* reallocate the base block */
      if ( REALLOC( table->block, table->capacity, new_size ) )
        return error;
  
      table->capacity = new_size;
  
      /* shift all offsets if necessary */
      if ( old_base )
        shift_elements( table, old_base );
  
      return T1_Err_Ok;
    }
  
  
    /*************************************************************************/
    /*                                                                       */
    /* <Function>                                                            */
    /*    Z1_Add_Table                                                       */
    /*                                                                       */
    /* <Description>                                                         */
    /*    Adds an object to a Z1_Table, possibly growing its memory block.   */
    /*                                                                       */
    /* <InOut>                                                               */
    /*    table  :: The target table.                                        */
    /*                                                                       */
    /* <Input>                                                               */
    /*    index  :: The index of the object in the table.                    */
    /*                                                                       */
    /*    object :: The address of the object to copy in memory.             */
    /*                                                                       */
    /*    length :: The length in bytes of the source object.                */
    /*                                                                       */
    /* <Return>                                                              */
    /*    FreeType error code.  0 means success.  An error is returned if a  */
    /*    reallocation fails.                                                */
    /*                                                                       */
    LOCAL_FUNC
    FT_Error  Z1_Add_Table( Z1_Table*  table,
                            FT_Int     index,
                            void*      object,
                            FT_Int     length )
    {
      if ( index < 0 || index > table->max_elems )
      {
        FT_ERROR(( "Z1_Add_Table: invalid index\n" ));
        return T1_Err_Syntax_Error;
      }
  
      /* grow the base block if needed */
      if ( table->cursor + length > table->capacity )
      {
        FT_Error  error;
        FT_Int    new_size = table->capacity;
  
  
        while ( new_size < table->cursor + length )
          new_size += 1024;
  
        error = reallocate_t1_table( table, new_size );
        if ( error )
          return error;
      }
  
      /* add the object to the base block and adjust offset */
      table->elements[index] = table->block + table->cursor;
      table->lengths [index] = length;
      MEM_Copy( table->block + table->cursor, object, length );
  
      table->cursor += length;
      return T1_Err_Ok;
    }
  
  
  #if 0
  
    /*************************************************************************/
    /*                                                                       */
    /* <Function>                                                            */
    /*    Z1_Done_Table                                                      */
    /*                                                                       */
    /* <Description>                                                         */
    /*    Finalizes a Z1_Table (i.e., reallocate it to its current cursor).  */
    /*                                                                       */
    /* <InOut>                                                               */
    /*    table :: The target table.                                         */
    /*                                                                       */
    /* <Note>                                                                */
    /*    This function does NOT release the heap's memory block.  It is up  */
    /*    to the caller to clean it, or reference it in its own structures.  */
    /*                                                                       */
    LOCAL_FUNC
    void  Z1_Done_Table( Z1_Table*  table )
    {
      FT_Memory  memory = table->memory;
      FT_Error   error;
      FT_Byte*   old_base;
  
  
      /* should never fail, as rec.cursor <= rec.size */
      old_base = table->block;
      if ( !old_base )
        return;
  
      (void)REALLOC( table->block, table->capacity, table->cursor );
      table->capacity = table->cursor;
  
      if ( old_base != table->block )
        shift_elements( table, old_base );
    }
  
  #endif /* 0 */
  
  
    LOCAL_FUNC
    void  Z1_Release_Table( Z1_Table*  table )
    {
      FT_Memory  memory = table->memory;
  
  
      if ( table->init == (FT_Long)0xDEADBEEF )
      {
        FREE( table->block );
        FREE( table->elements );
        FREE( table->lengths );
        table->init = 0;
      }
    }
  
  
    /*************************************************************************/
    /*************************************************************************/
    /*************************************************************************/
    /*****                                                               *****/
    /*****                   INPUT STREAM PARSER                         *****/
    /*****                                                               *****/
    /*************************************************************************/
    /*************************************************************************/
    /*************************************************************************/
  
  
  #define IS_Z1_WHITESPACE( c )  ( (c) == ' '  || (c) == '\t' )
  #define IS_Z1_LINESPACE( c )   ( (c) == '\r' || (c) == '\n' )
  
  #define IS_Z1_SPACE( c )  ( IS_Z1_WHITESPACE( c ) || IS_Z1_LINESPACE( c ) )
  
  
    LOCAL_FUNC
    void  Z1_Skip_Spaces( Z1_Parser*  parser )
    {
      FT_Byte* cur   = parser->cursor;
      FT_Byte* limit = parser->limit;
  
  
      while ( cur < limit )
      {
        FT_Byte  c = *cur;
  
  
        if ( !IS_Z1_SPACE( c ) )
          break;
        cur++;
      }
      parser->cursor = cur;
    }
  
  
    LOCAL_FUNC
    void  Z1_ToToken( Z1_Parser*     parser,
                      Z1_Token_Rec*  token )
    {
      FT_Byte*  cur;
      FT_Byte*  limit;
      FT_Byte   starter, ender;
      FT_Int    embed;
  
  
      token->type  = t1_token_none;
      token->start = 0;
      token->limit = 0;
  
      /* first of all, skip space */
      Z1_Skip_Spaces( parser );
  
      cur   = parser->cursor;
      limit = parser->limit;
  
      if ( cur < limit )
      {
        switch ( *cur )
        {
          /************* check for strings ***********************/
        case '(':
          token->type = t1_token_string;
          ender = ')';
          goto Lookup_Ender;
  
          /************* check for programs/array ****************/
        case '{':
          token->type = t1_token_array;
          ender = '}';
          goto Lookup_Ender;
  
          /************* check for table/array ******************/
        case '[':
          token->type = t1_token_array;
          ender = ']';
  
        Lookup_Ender:
          embed   = 1;
          starter = *cur++;
          token->start = cur;
          while ( cur < limit )
          {
            if ( *cur == starter )
              embed++;
            else if ( *cur == ender )
            {
              embed--;
              if ( embed <= 0 )
              {
                token->limit = cur++;
                break;
              }
            }
            cur++;
          }
          break;
  
          /* **************** otherwise, it's any token **********/
        default:
          token->start = cur++;
          token->type  = t1_token_any;
          while ( cur < limit && !IS_Z1_SPACE( *cur ) )
            cur++;
  
          token->limit = cur;
        }
  
        if ( !token->limit )
        {
          token->start = 0;
          token->type  = t1_token_none;
        }
  
        parser->cursor = cur;
      }
    }
  
  
    LOCAL_FUNC
    void  Z1_ToTokenArray( Z1_Parser*     parser,
                           Z1_Token_Rec*  tokens,
                           FT_UInt        max_tokens,
                           FT_Int*        pnum_tokens )
    {
      Z1_Token_Rec  master;
  
  
      *pnum_tokens = -1;
  
      Z1_ToToken( parser, &master );
      if ( master.type == t1_token_array )
      {
        FT_Byte*       old_cursor = parser->cursor;
        FT_Byte*       old_limit  = parser->limit;
        Z1_Token_Rec*  cur        = tokens;
        Z1_Token_Rec*  limit      = cur + max_tokens;
  
  
        parser->cursor = master.start;
        parser->limit  = master.limit;
  
        while ( parser->cursor < parser->limit )
        {
          Z1_Token_Rec  token;
  
  
          Z1_ToToken( parser, &token );
          if ( !token.type )
            break;
  
          if ( cur < limit )
            *cur = token;
  
          cur++;
        }
  
        *pnum_tokens = cur - tokens;
  
        parser->cursor = old_cursor;
        parser->limit  = old_limit;
      }
    }
  
  
    static
    FT_Long  t1_toint( FT_Byte**  cursor,
                       FT_Byte*   limit )
    {
      FT_Long   result = 0;
      FT_Byte*  cur    = *cursor;
      FT_Byte   c, d;
  
  
      for ( ; cur < limit; cur++ )
      {
        c = *cur;
        d = (FT_Byte)( c - '0' );
        if ( d < 10 )
          break;
  
        if ( c == '-' )
        {
          cur++;
          break;
        }
      }
  
      if ( cur < limit )
      {
        do
        {
          d = (FT_Byte)( cur[0] - '0' );
          if ( d >= 10 )
            break;
  
          result = result * 10 + d;
          cur++;
  
        } while ( cur < limit );
  
        if ( c == '-' )
          result = -result;
      }
  
      *cursor = cur;
      return result;
    }
  
  
    static
    FT_Long  t1_tofixed( FT_Byte**  cursor,
                         FT_Byte*   limit,
                         FT_Long    power_ten )
    {
      FT_Byte* cur  = *cursor;
      FT_Long  num, divider, result;
      FT_Int   sign = 0;
      FT_Byte  d;
  
  
      if ( cur >= limit )
        return 0;
  
      /* first of all, read the integer part */
      result  = t1_toint( &cur, limit ) << 16;
      num     = 0;
      divider = 1;
  
      if ( result < 0 )
      {
        sign   = 1;
        result = -result;
      }
  
      if ( cur >= limit )
        goto Exit;
  
      /* read decimal part, if any */
      if ( *cur == '.' && cur + 1 < limit )
      {
        cur++;
  
        for (;;)
        {
          d = (FT_Byte)( *cur - '0' );
          if ( d >= 10 )
            break;
  
          if ( divider < 10000000L )
          {
            num      = num * 10 + d;
            divider *= 10;
          }
  
          cur++;
          if ( cur >= limit )
            break;
        }
      }
  
      /* read exponent, if any */
      if ( cur + 1 < limit && ( *cur == 'e' || *cur == 'E' ) )
      {
        cur++;
        power_ten += t1_toint( &cur, limit );
      }
  
    Exit:
      /* raise to power of ten if needed */
      while ( power_ten > 0 )
      {
        result = result * 10;
        num    = num * 10;
        power_ten--;
      }
  
      while ( power_ten < 0 )
      {
        result  = result / 10;
        divider = divider * 10;
        power_ten++;
      }
  
      if ( num )
        result += FT_DivFix( num, divider );
  
      if ( sign )
        result = -result;
  
      *cursor = cur;
      return result;
    }
  
  
    static
    FT_Int  t1_tocoordarray( FT_Byte**  cursor,
                             FT_Byte*   limit,
                             FT_Int     max_coords,
                             FT_Short*  coords )
    {
      FT_Byte*  cur   = *cursor;
      FT_Int    count = 0;
      FT_Byte   c, ender;
  
  
      if ( cur >= limit )
        goto Exit;
  
      /* check for the beginning of an array. If not, only one number will */
      /* be read                                                           */
      c     = *cur;
      ender = 0;
  
      if ( c == '[' )
        ender = ']';
  
      if ( c == '{' )
        ender = '}';
  
      if ( ender )
        cur++;
  
      /* now, read the coordinates */
      for ( ; cur < limit; )
      {
        /* skip whitespace in front of data */
        for (;;)
        {
          c = *cur;
          if ( c != ' ' && c != '\t' )
            break;
  
          cur++;
          if ( cur >= limit )
            goto Exit;
        }
  
        if ( count >= max_coords || c == ender )
          break;
  
        coords[count] = (FT_Short)( t1_tofixed( &cur, limit, 0 ) >> 16 );
        count++;
  
        if ( !ender )
          break;
      }
  
    Exit:
      *cursor = cur;
      return count;
    }
  
  
    static
    FT_Int  t1_tofixedarray( FT_Byte**  cursor,
                             FT_Byte*   limit,
                             FT_Int     max_values,
                             FT_Fixed*  values,
                             FT_Int     power_ten )
    {
      FT_Byte*  cur   = *cursor;
      FT_Int    count = 0;
      FT_Byte   c, ender;
  
  
      if ( cur >= limit ) goto Exit;
  
      /* check for the beginning of an array. If not, only one number will */
      /* be read                                                           */
      c     = *cur;
      ender = 0;
  
      if ( c == '[' )
        ender = ']';
  
      if ( c == '{' )
        ender = '}';
  
      if ( ender )
        cur++;
  
      /* now, read the values */
      for ( ; cur < limit; )
      {
        /* skip whitespace in front of data */
        for (;;)
        {
          c = *cur;
          if ( c != ' ' && c != '\t' )
            break;
  
          cur++;
          if ( cur >= limit )
            goto Exit;
        }
  
        if ( count >= max_values || c == ender )
          break;
  
        values[count] = t1_tofixed( &cur, limit, power_ten );
        count++;
  
        if ( !ender )
          break;
      }
  
    Exit:
      *cursor = cur;
      return count;
    }
  
  
  #if 0
  
    static
    FT_String*  t1_tostring( FT_Byte**  cursor,
                             FT_Byte*   limit,
                             FT_Memory  memory )
    {
      FT_Byte*    cur = *cursor;
      FT_Int      len = 0;
      FT_Int      count;
      FT_String*  result;
      FT_Error    error;
  
  
      /* XXX: some stupid fonts have a `Notice' or `Copyright' string     */
      /*      that simply doesn't begin with an opening parenthesis, even */
      /*      though they have a closing one!  E.g. "amuncial.pfb"        */
      /*                                                                  */
      /*      We must deal with these ill-fated cases there.  Note that   */
      /*      these fonts didn't work with the old Type 1 driver as the   */
      /*      notice/copyright was not recognized as a valid string token */
      /*      and made the old token parser commit errors.                */
  
      while ( cur < limit && ( *cur == ' ' || *cur == '\t' ) )
        cur++;
      if ( cur + 1 >= limit )
        return 0;
  
      if ( *cur == '(' )
        cur++;  /* skip the opening parenthesis, if there is one */
  
      *cursor = cur;
      count   = 0;
  
      /* then, count its length */
      for ( ; cur < limit; cur++ )
      {
        if ( *cur == '(' )
          count++;
  
        else if ( *cur == ')' )
        {
          count--;
          if ( count < 0 )
            break;
        }
      }
  
      len = cur - *cursor;
      if ( cur >= limit || ALLOC( result, len + 1 ) )
        return 0;
  
      /* now copy the string */
      MEM_Copy( result, *cursor, len );
      result[len] = '\0';
      *cursor = cur;
      return result;
    }
  
  #endif /* 0 */
  
  
    static
    int  t1_tobool( FT_Byte**  cursor,
                    FT_Byte*   limit )
    {
      FT_Byte*  cur    = *cursor;
      FT_Bool   result = 0;
  
  
      /* return 1 if we find `true', 0 otherwise */
      if ( cur + 3 < limit &&
           cur[0] == 't' &&
           cur[1] == 'r' &&
           cur[2] == 'u' &&
           cur[3] == 'e' )
      {
        result = 1;
        cur   += 5;
      }
      else if ( cur + 4 < limit &&
                cur[0] == 'f' &&
                cur[1] == 'a' &&
                cur[2] == 'l' &&
                cur[3] == 's' &&
                cur[4] == 'e' )
      {
        result = 0;
        cur   += 6;
      }
  
      *cursor = cur;
      return result;
    }
  
  
    /* Load a simple field (i.e. non-table) into the current list of objects */
    LOCAL_FUNC
    FT_Error  Z1_Load_Field( Z1_Parser*           parser,
                             const Z1_Field_Rec*  field,
                             void**               objects,
                             FT_UInt              max_objects,
                             FT_ULong*            pflags )
    {
      Z1_Token_Rec  token;
      FT_Byte*      cur;
      FT_Byte*      limit;
      FT_UInt       count;
      FT_UInt       index;
      FT_Error      error;
  
  
      Z1_ToToken( parser, &token );
      if ( !token.type )
        goto Fail;
  
      count = 1;
      index = 0;
      cur   = token.start;
      limit = token.limit;
  
      if ( token.type == t1_token_array )
      {
        /* if this is an array, and we have no blend, an error occurs */
        if ( max_objects == 0 )
          goto Fail;
  
        count = max_objects;
        index = 1;
      }
  
      for ( ; count > 0; count--, index++ )
      {
        FT_Byte*    q = (FT_Byte*)objects[index] + field->offset;
        FT_Long     val;
        FT_String*  string;
  
        switch ( field->type )
        {
        case t1_field_bool:
          val = t1_tobool( &cur, limit );
          goto Store_Integer;
  
        case t1_field_fixed:
          val = t1_tofixed( &cur, limit, 3 );
          goto Store_Integer;
  
        case t1_field_integer:
          val = t1_toint( &cur, limit );
  
        Store_Integer:
          switch ( field->size )
          {
          case 1:
            *(FT_Byte*)q = (FT_Byte)val;
            break;
  
          case 2:
            *(FT_UShort*)q = (FT_UShort)val;
            break;
  
          case 4:
            *(FT_UInt32*)q = (FT_UInt32)val;
            break;
  
          default:  /* for 64-bit systems */
            *(FT_Long*)q = val;
          }
          break;
  
        case t1_field_string:
          {
            FT_Memory  memory = parser->memory;
            FT_UInt    len    = limit-cur;
  
            if ( ALLOC( string, len + 1 ) )
              goto Exit;
  
            MEM_Copy( string, cur, len );
            string[len] = 0;
  
            *(FT_String**)q = string;
          }
          break;
  
        default:
          /* an error occured */
          goto Fail;
        }
      }
  
      if ( pflags )
        *pflags |= 1L << field->flag_bit;
  
      error = FT_Err_Ok;
  
    Exit:
      return error;
  
    Fail:
      error = T1_Err_Invalid_File_Format;
      goto Exit;
    }
  
  
  #define T1_MAX_TABLE_ELEMENTS  32
  
  
    LOCAL_FUNC
    FT_Error  Z1_Load_Field_Table( Z1_Parser*           parser,
                                   const Z1_Field_Rec*  field,
                                   void**               objects,
                                   FT_UInt              max_objects,
                                   FT_ULong*            pflags )
    {
      Z1_Token_Rec   elements[T1_MAX_TABLE_ELEMENTS];
      Z1_Token_Rec*  token;
      FT_Int         num_elements;
      FT_Error       error = 0;
      FT_Byte*       old_cursor;
      FT_Byte*       old_limit;
      Z1_Field_Rec   fieldrec = *(Z1_Field_Rec*)field;
  
  
      Z1_ToTokenArray( parser, elements, 32, &num_elements );
      if ( num_elements < 0 )
        goto Fail;
  
      if ( num_elements > T1_MAX_TABLE_ELEMENTS )
        num_elements = T1_MAX_TABLE_ELEMENTS;
  
      old_cursor = parser->cursor;
      old_limit  = parser->limit;
  
      /* we store the elements count */
      *(FT_Byte*)( (FT_Byte*)objects[0] + field->count_offset ) = num_elements;
  
      /* we now load each element, adjusting the field.offset on each one */
      token = elements;
      for ( ; num_elements > 0; num_elements--, token++ )
      {
        parser->cursor = token->start;
        parser->limit  = token->limit;
        Z1_Load_Field( parser, &fieldrec, objects, max_objects, 0 );
        fieldrec.offset += fieldrec.size;
      }
  
      if ( pflags )
        *pflags |= 1L << field->flag_bit;
  
      parser->cursor = old_cursor;
      parser->limit  = old_limit;
  
    Exit:
      return error;
  
    Fail:
      error = T1_Err_Invalid_File_Format;
      goto Exit;
    }
  
  
    LOCAL_FUNC
    FT_Long  Z1_ToInt  ( Z1_Parser*  parser )
    {
      return t1_toint( &parser->cursor, parser->limit );
    }
  
  
    LOCAL_FUNC
    FT_Long  Z1_ToFixed( Z1_Parser*  parser,
                         FT_Int      power_ten )
    {
      return t1_tofixed( &parser->cursor, parser->limit, power_ten );
    }
  
  
    LOCAL_FUNC
    FT_Int  Z1_ToCoordArray( Z1_Parser*  parser,
                             FT_Int      max_coords,
                             FT_Short*   coords )
    {
      return t1_tocoordarray( &parser->cursor, parser->limit,
                              max_coords, coords );
    }
  
  
    LOCAL_FUNC
    FT_Int  Z1_ToFixedArray( Z1_Parser*  parser,
                             FT_Int      max_values,
                             FT_Fixed*   values,
                             FT_Int      power_ten )
    {
      return t1_tofixedarray( &parser->cursor, parser->limit,
                              max_values, values, power_ten );
    }
  
  
  #if 0
  
    LOCAL_FUNC
    FT_String*  Z1_ToString( Z1_Parser*  parser )
    {
      return t1_tostring( &parser->cursor, parser->limit, parser->memory );
    }
  
  
    LOCAL_FUNC
    FT_Bool  Z1_ToBool( Z1_Parser*  parser )
    {
      return t1_tobool( &parser->cursor, parser->limit );
    }
  
  #endif /* 0 */
  
  
    static
    FT_Error  read_pfb_tag( FT_Stream   stream,
                            FT_UShort*  tag,
                            FT_Long*    size )
    {
      FT_Error  error;
  
  
      if ( READ_UShort( *tag ) )
        goto Exit;
  
      if ( *tag == 0x8001 || *tag == 0x8002 )
      {
        FT_Long  asize;
  
  
        if ( READ_ULong( asize ) )
          goto Exit;
  
        /* swap between big and little endianness */
        *size  = ( ( asize & 0xFF000000L ) >> 24 ) |
                 ( ( asize & 0x00FF0000L ) >> 8  ) |
                 ( ( asize & 0x0000FF00L ) << 8  ) |
                 ( ( asize & 0x000000FFL ) << 24 );
      }
  
    Exit:
      return error;
    }
  
  
    LOCAL_FUNC
    FT_Error  Z1_New_Parser( Z1_Parser*  parser,
                             FT_Stream   stream,
                             FT_Memory   memory )
    {
      FT_Error  error;
      FT_UShort tag;
      FT_Long   size;
  
  
      parser->stream       = stream;
      parser->memory       = memory;
      parser->base_len     = 0;
      parser->base_dict    = 0;
      parser->private_len  = 0;
      parser->private_dict = 0;
      parser->in_pfb       = 0;
      parser->in_memory    = 0;
      parser->single_block = 0;
  
      parser->cursor       = 0;
      parser->limit        = 0;
  
      /******************************************************************/
      /*                                                                */
      /* Here a short summary of what is going on:                      */
      /*                                                                */
      /*   When creating a new Type 1 parser, we try to locate and load */
      /*   the base dictionary if this is possible (i.e. for PFB        */
      /*   files).  Otherwise, we load the whole font into memory.      */
      /*                                                                */
      /*   When `loading' the base dictionary, we only setup pointers   */
      /*   in the case of a memory-based stream.  Otherwise, we         */
      /*   allocate and load the base dictionary in it.                 */
      /*                                                                */
      /*   parser->in_pfb is set if we are in a binary (".pfb") font.   */
      /*   parser->in_memory is set if we have a memory stream.         */
      /*                                                                */
  
      /* try to compute the size of the base dictionary;   */
      /* look for a Postscript binary file tag, i.e 0x8001 */
      if ( FILE_Seek( 0L ) )
        goto Exit;
  
      error = read_pfb_tag( stream, &tag, &size );
      if ( error )
        goto Exit;
  
      if ( tag != 0x8001 )
      {
        /* assume that this is a PFA file for now; an error will */
        /* be produced later when more things are checked        */
        (void)FILE_Seek( 0L );
        size = stream->size;
      }
      else
        parser->in_pfb = 1;
  
      /* now, try to load `size' bytes of the `base' dictionary we */
      /* found previously                                          */
  
      /* if it is a memory-based resource, set up pointers */
      if ( !stream->read )
      {
        parser->base_dict = (FT_Byte*)stream->base + stream->pos;
        parser->base_len  = size;
        parser->in_memory = 1;
  
        /* check that the `size' field is valid */
        if ( FILE_Skip( size ) )
          goto Exit;
      }
      else
      {
        /* read segment in memory */
        if ( ALLOC( parser->base_dict, size )     ||
             FILE_Read( parser->base_dict, size ) )
          goto Exit;
        parser->base_len = size;
      }
  
      /* Now check font format; we must see `%!PS-AdobeFont-1' */
      /* or `%!FontType'                                       */
      {
        if ( size <= 16                                    ||
             ( strncmp( (const char*)parser->base_dict,
                        "%!PS-AdobeFont-1", 16 )        &&
               strncmp( (const char*)parser->base_dict,
                        "%!FontType", 10 )              )  )
        {
          FT_TRACE2(( "[not a Type1 font]\n" ));
          error = FT_Err_Unknown_File_Format;
        }
        else
        {
          parser->cursor = parser->base_dict;
          parser->limit  = parser->cursor + parser->base_len;
        }
      }
  
    Exit:
      if ( error && !parser->in_memory )
        FREE( parser->base_dict );
  
      return error;
    }
  
  
    LOCAL_FUNC
    void  Z1_Done_Parser( Z1_Parser*  parser )
    {
      FT_Memory   memory = parser->memory;
  
  
      /* always free the private dictionary */
      FREE( parser->private_dict );
  
      /* free the base dictionary only when we have a disk stream */
      if ( !parser->in_memory )
        FREE( parser->base_dict );
    }
  
  
    /* return the value of an hexadecimal digit */
    static
    int  hexa_value( char  c )
    {
     unsigned int  d;
  
  
      d = (unsigned int)( c - '0' );
      if ( d <= 9 )
        return (int)d;
  
      d = (unsigned int)( c - 'a' );
      if ( d <= 5 )
        return (int)( d + 10 );
  
      d = (unsigned int)( c - 'A' );
      if ( d <= 5 )
        return (int)( d + 10 );
  
      return -1;
    }
  
  
    LOCAL_FUNC
    void  Z1_Decrypt( FT_Byte*   buffer,
                      FT_Int     length,
                      FT_UShort  seed )
    {
      while ( length > 0 )
      {
        FT_Byte  plain;
  
  
        plain     = ( *buffer ^ ( seed >> 8 ) );
        seed      = ( *buffer + seed ) * 52845 + 22719;
        *buffer++ = plain;
        length--;
      }
    }
  
  
    LOCAL_FUNC
    FT_Error  Z1_Get_Private_Dict( Z1_Parser*  parser )
    {
      FT_Stream  stream = parser->stream;
      FT_Memory  memory = parser->memory;
      FT_Error   error  = 0;
      FT_Long    size;
  
  
      if ( parser->in_pfb )
      {
        /* in the case of the PFB format, the private dictionary can be  */
        /* made of several segments.  We thus first read the number of   */
        /* segments to compute the total size of the private dictionary  */
        /* then re-read them into memory.                                */
        FT_Long    start_pos = FILE_Pos();
        FT_UShort  tag;
        FT_Long    size;
  
  
        parser->private_len = 0;
        for (;;)
        {
          error = read_pfb_tag( stream, &tag, &size );
          if ( error )
            goto Fail;
  
          if ( tag != 0x8002 )
            break;
  
          parser->private_len += size;
  
          if ( FILE_Skip( size ) )
            goto Fail;
        }
  
        /* Check that we have a private dictionary there */
        /* and allocate private dictionary buffer        */
        if ( parser->private_len == 0 )
        {
          FT_ERROR(( "Z1_Get_Private_Dict:" ));
          FT_ERROR(( " invalid private dictionary section\n" ));
          error = T1_Err_Invalid_File_Format;
          goto Fail;
        }
  
        if ( FILE_Seek( start_pos )                             ||
             ALLOC( parser->private_dict, parser->private_len ) )
          goto Fail;
  
        parser->private_len = 0;
        for (;;)
        {
          error = read_pfb_tag( stream, &tag, &size );
          if ( error || tag != 0x8002 )
          {
            error = FT_Err_Ok;
            break;
          }
  
          if ( FILE_Read( parser->private_dict + parser->private_len, size ) )
            goto Fail;
  
          parser->private_len += size;
        }
      }
      else
      {
        /* we have already `loaded' the whole PFA font file into memory; */
        /* if this is a memory resource, allocate a new block to hold    */
        /* the private dict. Otherwise, simply overwrite into the base   */
        /* dictionary block in the heap.                                 */
  
        /* first of all, look at the `eexec' keyword */
        FT_Byte*  cur   = parser->base_dict;
        FT_Byte*  limit = cur + parser->base_len;
        FT_Byte   c;
  
  
        for (;;)
        {
          c = cur[0];
          if ( c == 'e' && cur + 9 < limit )  /* 9 = 5 letters for `eexec' + */
                                              /* newline + 4 chars           */
          {
            if ( cur[1] == 'e' && cur[2] == 'x' &&
                 cur[3] == 'e' && cur[4] == 'c' )
            {
              cur += 6; /* we skip the newling after the `eexec' */
  
              /* XXX: Some fonts use DOS-linefeeds, i.e. \r\n; we need to */
              /*      skip the extra \n if we find it                     */
              if ( cur[0] == '\n' )
                cur++;
  
              break;
            }
          }
          cur++;
          if ( cur >= limit )
          {
            FT_ERROR(( "Z1_Get_Private_Dict:" ));
            FT_ERROR(( " could not find `eexec' keyword\n" ));
            error = T1_Err_Invalid_File_Format;
            goto Exit;
          }
        }
  
        /* now determine where to write the _encrypted_ binary private  */
        /* dictionary.  We overwrite the base dictionary for disk-based */
        /* resources and allocate a new block otherwise                 */
  
        size = parser->base_len - ( cur - parser->base_dict);
  
        if ( parser->in_memory )
        {
          /* note that we allocate one more byte to put a terminating `0' */
          if ( ALLOC( parser->private_dict, size + 1 ) )
            goto Fail;
          parser->private_len = size;
        }
        else
        {
          parser->single_block = 1;
          parser->private_dict = parser->base_dict;
          parser->private_len  = size;
          parser->base_dict    = 0;
          parser->base_len     = 0;
        }
  
        /* now determine whether the private dictionary is encoded in binary */
        /* or hexadecimal ASCII format -- decode it accordingly              */
  
        /* we need to access the next 4 bytes (after the final \r following */
        /* the `eexec' keyword); if they all are hexadecimal digits, then   */
        /* we have a case of ASCII storage                                  */
  
        if ( ( hexa_value( cur[0] ) | hexa_value( cur[1] ) |
               hexa_value( cur[2] ) | hexa_value( cur[3] ) ) < 0 )
  
          /* binary encoding -- `simply' copy the private dict */
          MEM_Copy( parser->private_dict, cur, size );
  
        else
        {
          /* ASCII hexadecimal encoding */
  
          FT_Byte*  write;
          FT_Int    count;
  
  
          write = parser->private_dict;
          count = 0;
  
          for ( ;cur < limit; cur++ )
          {
            int  hex1;
  
  
            /* check for newline */
            if ( cur[0] == '\r' || cur[0] == '\n' )
              continue;
  
            /* exit if we have a non-hexadecimal digit that isn't a newline */
            hex1 = hexa_value( cur[0] );
            if ( hex1 < 0 || cur + 1 >= limit )
              break;
  
            /* otherwise, store byte */
            *write++ = ( hex1 << 4 ) | hexa_value( cur[1] );
            count++;
            cur++;
          }
  
          /* put a safeguard */
          parser->private_len = write - parser->private_dict;
          *write++ = 0;
        }
      }
  
      /* we now decrypt the encoded binary private dictionary */
      Z1_Decrypt( parser->private_dict, parser->private_len, 55665 );
      parser->cursor = parser->private_dict;
      parser->limit  = parser->cursor + parser->private_len;
  
    Fail:
    Exit:
      return error;
    }
  
  
  /* END */
  

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