kc3-lang/freetype/config/dos/FTSYSTEM.C

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• Hash : b4a98378
  Author :
  Date : 1999-12-21T14:08:00
  

  fixed a bug in ftsystem that prevented the library from reading files

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• config/dos/FTSYSTEM.C

• /**************************************************************************
   *
   *  ftsystem.h                                                        1.0
   *
   *    ANSI-specific FreeType low-level system interface
   *
   *    This file contains the definition of interface used by FreeType
   *    to access low-level, i.e. memory management, i/o access as well
   *    as thread synchronisation.              
   *
   *
   *  Copyright 1996-1999 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.                                          
   *                                                                           
   **************************************************************************/
  
  #include <ftsystem.h>
  #include <fterrors.h>
  
  #include <stdio.h>
  #include <stdlib.h>
  #include <string.h>
  
    /*********************************************************************/
    /*                                                                   */
    /*                       MEMORY MANAGEMENT INTERFACE                 */
    /*                                                                   */
  
  /************************************************************************
   *
   * <FuncType>
   *    FT_Alloc_Func
   *
   * <Description>
   *    The memory allocator function type
   *
   * <Input>
   *    system    :: pointer to the system object
   *    size      :: requested size in bytes
   *
   * <Output>
   *    block     :: address of newly allocated block
   *
   * <Return>  
   *    Error code. 0 means success.
   *
   * <Note>
   *    If your allocation routine ALWAYS zeroes the new block, you
   *    should set the flag FT_SYSTEM_FLAG_ALLOC_ZEROES in your system
   *    object 'flags' field.
   *
   *    If you have set the flag FT_SYSTEM_FLAG_REPORT_CURRENT_ALLOC in
   *    your system's "system_flags" field, this function should update
   *    the "current_alloc" field of the system object.
   *
   ************************************************************************/
  
    static
    void*  ft_alloc( FT_Memory  memory,
                     long       size )
    {
      (void)memory;
      return malloc(size);
    }
  
  
  /************************************************************************
   *
   * <FuncType>
   *    FT_Realloc_Func
   *
   * <Description>
   *    The memory reallocator function type
   *
   * <Input>
   *    system   :: pointer to the system object
   *    new_size :: new requested size in bytes
   *
   * <InOut>
   *    block    :: address of block in memory
   *
   * <Return>
   *    Error code. 0 means success.
   *
   * <Note>
   *    This function is _never_ called when the system flag 
   *    FT_SYSTEM_FLAG_NO_REALLOC is set. Instead, the engine will emulate
   *    realloc through "alloc" and "free".
   *
   *    Note that this is possible due to the fact that FreeType's
   *    "FT_Realloc" always requests the _current_ size of the reallocated
   *    block as a parameter, thus avoiding memory leaks.
   *
   *    If you have set the flag FT_SYSTEM_FLAG_REPORT_CURRENT_ALLOC in
   *    your system's "system_flags" field, this function should update
   *    the "current_alloc" field of the system object.
   *
   ************************************************************************/
  
    static
    void*  ft_realloc( FT_Memory  memory,
                       long       cur_size,
                       long       new_size,
                       void*      block )
    {
      (void)memory;
      (void)cur_size;
  
      return realloc( block, new_size );
    }
  
  
  /************************************************************************
   *
   * <FuncType>
   *    FT_Free_Func
   *
   * <Description>
   *    The memory release function type
   *
   * <Input>
   *    system  :: pointer to the system object
   *    block   :: address of block in memory
   *
   * <Note>
   *    If you have set the flag FT_SYSTEM_FLAG_REPORT_CURRENT_ALLOC in
   *    your system's "system_flags" field, this function should update
   *    the "current_alloc" field of the system object.
   *
   ************************************************************************/
  
    static
    void  ft_free( FT_Memory  memory,
                   void*      block )
    {
      (void)memory;
      free( block );
    }
  
    /*********************************************************************/
    /*                                                                   */
    /*                     RESOURCE MANAGEMENT INTERFACE                 */
    /*                                                                   */
  
  
  #define STREAM_FILE(stream)  ((FILE*)stream->descriptor.pointer)
  
    static
    void  ft_close_stream( FT_Stream  stream )
    {
      fclose( STREAM_FILE(stream) );
    }
  
    static
    unsigned long  ft_io_stream( FT_Stream      stream,
                                 unsigned long  offset,
                                 char*          buffer,
                                 unsigned long  count )
    {
      FILE*  file;
      
      file = STREAM_FILE(stream);
  
      fseek( file, offset, SEEK_SET );    
      return (unsigned long)fread( buffer, 1, count, file );
    }
  
  
    extern
    int  FT_New_Stream( const char*  filepathname,
                        FT_Stream    stream )
    {
      FILE*  file;
      
      file = fopen( filepathname, "rb" );
      if (!file)
        return FT_Err_Cannot_Open_Resource;
        
      fseek( file, 0, SEEK_END );
      stream->size = ftell(file);
      fseek( file, 0, SEEK_SET );
      
      stream->descriptor.pointer = file;
      stream->pos                = 0;
      
      stream->read  = ft_io_stream;
      stream->close = ft_close_stream;
  
      return 0;
    }
  
  
    extern
    FT_Memory  FT_New_Memory( void )
    {
      FT_Memory  memory;
      
      memory = (FT_Memory)malloc( sizeof(*memory) );
      if (memory)
      {
        memory->user    = 0;
        memory->alloc   = ft_alloc;
        memory->realloc = ft_realloc;
        memory->free    = ft_free;
      }
      return memory;
    }
  
  

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