ftsystem.c

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/***************************************************************************/
/*                                                                         */
/*  ftsystem.c                                                             */
/*                                                                         */
/*    Amiga-specific FreeType low-level system interface (body).           */
/*                                                                         */
/*  Copyright 1996-2001, 2002, 2005, 2006, 2007 by                         */
/*  David Turner, Robert Wilhelm, Werner Lemberg and Detlef W黵kner.       */
/*                                                                         */
/*  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.                                        */
/*                                                                         */
/***************************************************************************/

  /*************************************************************************/
  /*                                                                       */
  /* This file contains the Amiga interface used by FreeType to access     */
  /* low-level, i.e. memory management, i/o access as well as thread       */
  /* synchronisation.                                                      */
  /*                                                                       */
  /*************************************************************************/


  /*************************************************************************/
  /*                                                                       */
  /* Maintained by Detlef W黵kner <[e-mail]>                   */
  /*                                                                       */
  /* Based on the original ftsystem.c,                                     */
  /* modified to avoid fopen(), fclose(), fread(), fseek(), ftell(),       */
  /* malloc(), realloc(), and free().                                      */
  /*                                                                       */
  /* Those C library functions are often not thread-safe or cant be        */
  /* used in a shared Amiga library. If that's not a problem for you,       */
  /* you can of course use the default ftsystem.c with C library calls     */
  /* instead.                                                              */
  /*                                                                       */
  /* This implementation needs exec V39+ because it uses AllocPooled() etc */
  /*                                                                       */
  /*************************************************************************/

#define __NOLIBBASE__
#define __NOGLOBALIFACE__
#define __USE_INLINE__
#include <proto/exec.h>
#include <dos/stdio.h>
#include <proto/dos.h>
#ifdef __amigaos4__
extern struct ExecIFace *IExec;
extern struct DOSIFace  *IDOS;
#else
extern struct Library   *SysBase;
extern struct Library   *DOSBase;
#endif

#define IOBUF_SIZE 512

/* structure that helps us to avoid
 * useless calls of Seek() and Read()
 */
struct SysFile
{
  BPTR  file;
  ULONG iobuf_start;
  ULONG iobuf_end;
  UBYTE iobuf[IOBUF_SIZE];
};

#ifndef __amigaos4__
/* C implementation of AllocVecPooled (see autodoc exec/AllocPooled) */
APTR
Alloc_VecPooled( APTR   poolHeader,
                 ULONG  memSize )
{
  ULONG  newSize = memSize + sizeof ( ULONG );
  ULONG  *mem = AllocPooled( poolHeader, newSize );

  if ( !mem )
    return NULL;
  *mem = newSize;
  return mem + 1;
}

/* C implementation of FreeVecPooled (see autodoc exec/AllocPooled) */
void
Free_VecPooled( APTR  poolHeader,
                APTR  memory )
{
  ULONG  *realmem = (ULONG *)memory - 1;

  FreePooled( poolHeader, realmem, *realmem );
}
#endif

#include <ft2build.h>
#include FT_CONFIG_CONFIG_H
#include FT_INTERNAL_DEBUG_H
#include FT_SYSTEM_H
#include FT_ERRORS_H
#include FT_TYPES_H

#include <stdio.h>
#include <stdlib.h>
#include <string.h>


  /*************************************************************************/
  /*                                                                       */
  /*                       MEMORY MANAGEMENT INTERFACE                     */
  /*                                                                       */
  /*************************************************************************/

  /*************************************************************************/
  /*                                                                       */
  /* It is not necessary to do any error checking for the                  */
  /* allocation-related functions.  This is done by the higher level       */
  /* routines like ft_mem_alloc() or ft_mem_realloc().                     */
  /*                                                                       */
  /*************************************************************************/


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    ft_alloc                                                           */
  /*                                                                       */
  /* <Description>                                                         */
  /*    The memory allocation function.                                    */
  /*                                                                       */
  /* <Input>                                                               */
  /*    memory :: A pointer to the memory object.                          */
  /*                                                                       */
  /*    size   :: The requested size in bytes.                             */
  /*                                                                       */
  /* <Return>                                                              */
  /*    The address of newly allocated block.                              */
  /*                                                                       */
  FT_CALLBACK_DEF( void* )
  ft_alloc( FT_Memory  memory,
            long       size )
  {
#ifdef __amigaos4__
    return AllocVecPooled( memory->user, size );
#else
    return Alloc_VecPooled( memory->user, size );
#endif
  }


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    ft_realloc                                                         */
  /*                                                                       */
  /* <Description>                                                         */
  /*    The memory reallocation function.                                  */
  /*                                                                       */
  /* <Input>                                                               */
  /*    memory   :: A pointer to the memory object.                        */
  /*                                                                       */
  /*    cur_size :: The current size of the allocated memory block.        */
  /*                                                                       */
  /*    new_size :: The newly requested size in bytes.                     */
  /*                                                                       */
  /*    block    :: The current address of the block in memory.            */
  /*                                                                       */
  /* <Return>                                                              */
  /*    The address of the reallocated memory block.                       */
  /*                                                                       */
  FT_CALLBACK_DEF( void* )
  ft_realloc( FT_Memory  memory,
              long       cur_size,
              long       new_size,
              void*      block )
  {
    void* new_block;

#ifdef __amigaos4__
    new_block = AllocVecPooled ( memory->user, new_size );
#else
    new_block = Alloc_VecPooled ( memory->user, new_size );
#endif
    if ( new_block != NULL )
    {
      CopyMem ( block, new_block,
                ( new_size > cur_size ) ? cur_size : new_size );
#ifdef __amigaos4__
      FreeVecPooled ( memory->user, block );
#else
      Free_VecPooled ( memory->user, block );
#endif
    }
    return new_block;
  }


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    ft_free                                                            */
  /*                                                                       */
  /* <Description>                                                         */
  /*    The memory release function.                                       */
  /*                                                                       */
  /* <Input>                                                               */
  /*    memory  :: A pointer to the memory object.                         */
  /*                                                                       */
  /*    block   :: The address of block in memory to be freed.             */
  /*                                                                       */
  FT_CALLBACK_DEF( void )
  ft_free( FT_Memory  memory,
           void*      block )
  {
#ifdef __amigaos4__
    FreeVecPooled( memory->user, block );
#else
    Free_VecPooled( memory->user, block );
#endif
  }


  /*************************************************************************/
  /*                                                                       */
  /*                     RESOURCE MANAGEMENT INTERFACE                     */
  /*                                                                       */
  /*************************************************************************/


  /*************************************************************************/
  /*                                                                       */
  /* 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_io

  /* We use the macro STREAM_FILE for convenience to extract the       */
  /* system-specific stream handle from a given FreeType stream object */
#define STREAM_FILE( stream )  ( (struct SysFile *)stream->descriptor.pointer )


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    ft_amiga_stream_close                                              */
  /*                                                                       */
  /* <Description>                                                         */
  /*    The function to close a stream.                                    */
  /*                                                                       */
  /* <Input>                                                               */
  /*    stream :: A pointer to the stream object.                          */
  /*                                                                       */
  FT_CALLBACK_DEF( void )
  ft_amiga_stream_close( FT_Stream  stream )
  {
    struct SysFile* sysfile;

    sysfile = STREAM_FILE( stream );
    Close ( sysfile->file );