/***************************************************************************/

/*                                                                         */

/*  ftsystem.c                                                             */

/*                                                                         */

/*    VMS-specific FreeType low-level system interface (body).             */

/*                                                                         */

/*  Copyright 1996-2001, 2002, 2005, 2010 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 <ft2build.h>

  /* we use our special ftconfig.h file, not the standard one */

#include <ftconfig.h>

#include FT_INTERNAL_DEBUG_H

#include FT_SYSTEM_H

#include FT_ERRORS_H

#include FT_TYPES_H

#include FT_INTERNAL_OBJECTS_H

  /* memory-mapping includes and definitions */

#ifdef HAVE_UNISTD_H

#include <unistd.h>

#endif

#include <sys/mman.h>

#ifndef MAP_FILE

#define MAP_FILE  0x00

#endif

#ifdef MUNMAP_USES_VOIDP

#define MUNMAP_ARG_CAST  void *

#else

#define MUNMAP_ARG_CAST  char *

#endif

#ifdef NEED_MUNMAP_DECL

#ifdef __cplusplus

  extern "C"

#else

  extern

#endif

  int

  munmap( char*  addr,

          int    len );

#define MUNMAP_ARG_CAST  char *

#endif /* NEED_DECLARATION_MUNMAP */

#include <sys/types.h>

#include <sys/stat.h>

#ifdef HAVE_FCNTL_H

#include <fcntl.h>

#endif

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

  /*************************************************************************/

  /*                                                                       */

  /*                       MEMORY MANAGEMENT INTERFACE                     */

  /*                                                                       */

  /*************************************************************************/

  /*************************************************************************/

  /*                                                                       */

  /* <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 )

  {

    FT_UNUSED( memory );

    return malloc( size );

  }

  /*************************************************************************/

  /*                                                                       */

  /* <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 )

  {

    FT_UNUSED( memory );

    FT_UNUSED( cur_size );

    return realloc( block, new_size );

  }

  /*************************************************************************/

  /*                                                                       */

  /* <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 )

  {

    FT_UNUSED( memory );

    free( block );

  }

  /*************************************************************************/

  /*                                                                       */

  /*                     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 )  ( (FILE*)stream->descriptor.pointer )

  /*************************************************************************/

  /*                                                                       */

  /* <Function>                                                            */

  /*    ft_close_stream                                                    */

  /*                                                                       */

  /* <Description>                                                         */

  /*    The function to close a stream.                                    */

  /*                                                                       */

  /* <Input>                                                               */

  /*    stream :: A pointer to the stream object.                          */

  /*                                                                       */

  FT_CALLBACK_DEF( void )

  ft_close_stream( FT_Stream  stream )

  {

    munmap( (MUNMAP_ARG_CAST)stream->descriptor.pointer, stream->size );

    stream->descriptor.pointer = NULL;

    stream->size               = 0;

    stream->base               = 0;

  }

  /* documentation is in ftobjs.h */

  FT_BASE_DEF( FT_Error )

  FT_Stream_Open( FT_Stream    stream,

                  const char*  filepathname )

  {

    int          file;

    struct stat  stat_buf;

    if ( !stream )

      return FT_Err_Invalid_Stream_Handle;

    /* open the file */

    file = open( filepathname, O_RDONLY );

    if ( file < 0 )

    {

      FT_ERROR(( "FT_Stream_Open:" ));

      FT_ERROR(( " could not open `%s'\n", filepathname ));

      return FT_Err_Cannot_Open_Resource;

    }

    if ( fstat( file, &stat_buf ) < 0 )

    {

      FT_ERROR(( "FT_Stream_Open:" ));

      FT_ERROR(( " could not `fstat' file `%s'\n", filepathname ));

      goto Fail_Map;

    }

    stream->size = stat_buf.st_size;

    if ( !stream->size )

    {

      FT_ERROR(( "FT_Stream_Open:" ));

      FT_ERROR(( " opened `%s' but zero-sized\n", filepathname ));

      goto Fail_Map;

    }

    stream->pos  = 0;

    stream->base = (unsigned char *)mmap( NULL,

                                          stream->size,

                                          PROT_READ,

                                          MAP_FILE | MAP_PRIVATE,

                                          file,

                                          0 );

    if ( (long)stream->base == -1 )

    {

      FT_ERROR(( "FT_Stream_Open:" ));

      FT_ERROR(( " could not `mmap' file `%s'\n", filepathname ));

      goto Fail_Map;

    }

    close( file );

    stream->descriptor.pointer = stream->base;

    stream->pathname.pointer   = (char*)filepathname;

    stream->close = ft_close_stream;

    stream->read  = 0;

    FT_TRACE1(( "FT_Stream_Open:" ));

    FT_TRACE1(( " opened `%s' (%d bytes) successfully\n",

                filepathname, stream->size ));

    return FT_Err_Ok;

  Fail_Map:

    close( file );

    stream->base = NULL;

    stream->size = 0;

    stream->pos  = 0;

    return FT_Err_Cannot_Open_Stream;

  }

#ifdef FT_DEBUG_MEMORY

  extern FT_Int

  ft_mem_debug_init( FT_Memory  memory );

  extern void

  ft_mem_debug_done( FT_Memory  memory );

#endif

  /* documentation is in ftobjs.h */

  FT_BASE_DEF( 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;

#ifdef FT_DEBUG_MEMORY

      ft_mem_debug_init( memory );

#endif

    }

    return memory;

  }

  /* documentation is in ftobjs.h */

  FT_BASE_DEF( void )

  FT_Done_Memory( FT_Memory  memory )

  {

#ifdef FT_DEBUG_MEMORY

    ft_mem_debug_done( memory );

#endif

    memory->free( memory, memory );

  }

/* END */