libraries/freetype-2.0.5/ftsystem.c

   1 /***************************************************************************/
   2 /*                                                                         */
   3 /*  ftsystem.c                                                             */
   4 /*                                                                         */
   5 /*    ANSI-specific FreeType low-level system interface (body).            */
   6 /*                                                                         */
   7 /*  Copyright 1996-2001 by                                                 */
   8 /*  David Turner, Robert Wilhelm, and Werner Lemberg.                      */
   9 /*                                                                         */
  10 /*  This file is part of the FreeType project, and may only be used,       */
  11 /*  modified, and distributed under the terms of the FreeType project      */
  12 /*  license, LICENSE.TXT.  By continuing to use, modify, or distribute     */
  13 /*  this file you indicate that you have read the license and              */
  14 /*  understand and accept it fully.                                        */
  15 /*                                                                         */
  16 /***************************************************************************/
  17
  18   /*************************************************************************/
  19   /*                                                                       */
  20   /* This file contains the default interface used by FreeType to access   */
  21   /* low-level, i.e. memory management, i/o access as well as thread       */
  22   /* synchronisation.  It can be replaced by user-specific routines if     */
  23   /* necessary.                                                            */
  24   /*                                                                       */
  25   /*************************************************************************/
  26
  27
  28 #include <ft2build.h>
  29 #include FT_CONFIG_CONFIG_H
  30 #include FT_INTERNAL_DEBUG_H
  31 #include FT_SYSTEM_H
  32 #include FT_ERRORS_H
  33 #include FT_TYPES_H
  34
  35 #include <stdio.h>
  36 #include <stdlib.h>
  37 #include <string.h>
  38
  39
  40   /*************************************************************************/
  41   /*                                                                       */
  42   /*                       MEMORY MANAGEMENT INTERFACE                     */
  43   /*                                                                       */
  44   /*************************************************************************/
  45
  46   /*************************************************************************/
  47   /*                                                                       */
  48   /* It is not necessary to do any error checking for the                  */
  49   /* allocation-related functions.  This will be done by the higher level  */
  50   /* routines like FT_Alloc() or FT_Realloc().                             */
  51   /*                                                                       */
  52   /*************************************************************************/
  53
  54
  55   /*************************************************************************/
  56   /*                                                                       */
  57   /* <Function>                                                            */
  58   /*    ft_alloc                                                           */
  59   /*                                                                       */
  60   /* <Description>                                                         */
  61   /*    The memory allocation function.                                    */
  62   /*                                                                       */
  63   /* <Input>                                                               */
  64   /*    memory :: A pointer to the memory object.                          */
  65   /*                                                                       */
  66   /*    size   :: The requested size in bytes.                             */
  67   /*                                                                       */
  68   /* <Return>                                                              */
  69   /*    The address of newly allocated block.                              */
  70   /*                                                                       */
  71   FT_CALLBACK_DEF( void* )
  72   ft_alloc( FT_Memory  memory,
  73             long       size )
  74   {
  75     FT_UNUSED( memory );
  76
  77     return malloc( size );
  78   }
  79
  80
  81   /*************************************************************************/
  82   /*                                                                       */
  83   /* <Function>                                                            */
  84   /*    ft_realloc                                                         */
  85   /*                                                                       */
  86   /* <Description>                                                         */
  87   /*    The memory reallocation function.                                  */
  88   /*                                                                       */
  89   /* <Input>                                                               */
  90   /*    memory   :: A pointer to the memory object.                        */
  91   /*                                                                       */
  92   /*    cur_size :: The current size of the allocated memory block.        */
  93   /*                                                                       */
  94   /*    new_size :: The newly requested size in bytes.                     */
  95   /*                                                                       */
  96   /*    block    :: The current address of the block in memory.            */
  97   /*                                                                       */
  98   /* <Return>                                                              */
  99   /*    The address of the reallocated memory block.                       */
 100   /*                                                                       */
 101   FT_CALLBACK_DEF( void* )
 102   ft_realloc( FT_Memory  memory,
 103               long       cur_size,
 104               long       new_size,
 105               void*      block )
 106   {
 107     FT_UNUSED( memory );
 108     FT_UNUSED( cur_size );
 109
 110     return realloc( block, new_size );
 111   }
 112
 113
 114   /*************************************************************************/
 115   /*                                                                       */
 116   /* <Function>                                                            */
 117   /*    ft_free                                                            */
 118   /*                                                                       */
 119   /* <Description>                                                         */
 120   /*    The memory release function.                                       */
 121   /*                                                                       */
 122   /* <Input>                                                               */
 123   /*    memory  :: A pointer to the memory object.                         */
 124   /*                                                                       */
 125   /*    block   :: The address of block in memory to be freed.             */
 126   /*                                                                       */
 127   FT_CALLBACK_DEF( void )
 128   ft_free( FT_Memory  memory,
 129            void*      block )
 130   {
 131     FT_UNUSED( memory );
 132
 133     free( block );
 134   }
 135
 136
 137   /*************************************************************************/
 138   /*                                                                       */
 139   /*                     RESOURCE MANAGEMENT INTERFACE                     */
 140   /*                                                                       */
 141   /*************************************************************************/
 142
 143
 144   /*************************************************************************/
 145   /*                                                                       */
 146   /* The macro FT_COMPONENT is used in trace mode.  It is an implicit      */
 147   /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log  */
 148   /* messages during execution.                                            */
 149   /*                                                                       */
 150 #undef  FT_COMPONENT
 151 #define FT_COMPONENT  trace_io
 152
 153   /* We use the macro STREAM_FILE for convenience to extract the       */
 154   /* system-specific stream handle from a given FreeType stream object */
 155 #define STREAM_FILE( stream )  ( (FILE*)stream->descriptor.pointer )
 156
 157
 158   /*************************************************************************/
 159   /*                                                                       */
 160   /* <Function>                                                            */
 161   /*    ft_close_stream                                                    */
 162   /*                                                                       */
 163   /* <Description>                                                         */
 164   /*    The function to close a stream.                                    */
 165   /*                                                                       */
 166   /* <Input>                                                               */
 167   /*    stream :: A pointer to the stream object.                          */
 168   /*                                                                       */
 169   FT_CALLBACK_DEF( void )
 170   ft_close_stream( FT_Stream  stream )
 171   {
 172     fclose( STREAM_FILE( stream ) );
 173
 174     stream->descriptor.pointer = NULL;
 175     stream->size               = 0;
 176     stream->base               = 0;
 177   }
 178
 179
 180   /*************************************************************************/
 181   /*                                                                       */
 182   /* <Function>                                                            */
 183   /*    ft_io_stream                                                       */
 184   /*                                                                       */
 185   /* <Description>                                                         */
 186   /*    The function to open a stream.                                     */
 187   /*                                                                       */
 188   /* <Input>                                                               */
 189   /*    stream :: A pointer to the stream object.                          */
 190   /*                                                                       */
 191   /*    offset :: The position in the data stream to start reading.        */
 192   /*                                                                       */
 193   /*    buffer :: The address of buffer to store the read data.            */
 194   /*                                                                       */
 195   /*    count  :: The number of bytes to read from the stream.             */
 196   /*                                                                       */
 197   /* <Return>                                                              */
 198   /*    The number of bytes actually read.                                 */
 199   /*                                                                       */
 200   FT_CALLBACK_DEF( unsigned long )
 201   ft_io_stream( FT_Stream       stream,
 202                 unsigned long   offset,
 203                 unsigned char*  buffer,
 204                 unsigned long   count )
 205   {
 206     FILE*  file;
 207
 208
 209     file = STREAM_FILE( stream );
 210
 211     fseek( file, offset, SEEK_SET );
 212
 213     return (unsigned long)fread( buffer, 1, count, file );
 214   }
 215
 216
 217   /* documentation is in ftobjs.h */
 218
 219   FT_EXPORT_DEF( FT_Error )
 220   FT_New_Stream( const char*  filepathname,
 221                  FT_Stream    astream )
 222   {
 223     FILE*  file;
 224
 225
 226     if ( !astream )
 227       return FT_Err_Invalid_Stream_Handle;
 228
 229     file = fopen( filepathname, "rb" );
 230     if ( !file )
 231     {
 232       FT_ERROR(( "FT_New_Stream:" ));
 233       FT_ERROR(( " could not open `%s'\n", filepathname ));
 234
 235       return FT_Err_Cannot_Open_Resource;
 236     }
 237
 238     fseek( file, 0, SEEK_END );
 239     astream->size = ftell( file );
 240     fseek( file, 0, SEEK_SET );
 241
 242     astream->descriptor.pointer = file;
 243     astream->pathname.pointer   = (char*)filepathname;
 244     astream->pos                = 0;
 245
 246     astream->read  = ft_io_stream;
 247     astream->close = ft_close_stream;
 248
 249     FT_TRACE1(( "FT_New_Stream:" ));
 250     FT_TRACE1(( " opened `%s' (%d bytes) successfully\n",
 251                 filepathname, astream->size ));
 252
 253     return FT_Err_Ok;
 254   }
 255
 256
 257   /* documentation is in ftobjs.h */
 258
 259   FT_EXPORT_DEF( FT_Memory )
 260   FT_New_Memory( void )
 261   {
 262     FT_Memory  memory;
 263
 264
 265     memory = (FT_Memory)malloc( sizeof ( *memory ) );
 266     if ( memory )
 267     {
 268       memory->user    = 0;
 269       memory->alloc   = ft_alloc;
 270       memory->realloc = ft_realloc;
 271       memory->free    = ft_free;
 272     }
 273
 274     return memory;
 275   }
 276
 277
 278   /* documentation is in ftobjs.h */
 279
 280   FT_EXPORT_DEF( void )
 281   FT_Done_Memory( FT_Memory  memory )
 282   {
 283     memory->free( memory, memory );
 284   }
 285
 286
 287 /* END */