ref: 6b8fcd530e01ba850b2ca649d533eab8075fd042
dir: /builds/unix/ftsystem.c/
/**************************************************************************
*
* ftsystem.c 1.0
*
* Unix-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 1996-2000 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.
*
**************************************************************************/
#include <ftsystem.h>
#include <fterrors.h>
#include <ftconfig.h>
#include <ftdebug.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
/*
* The prototype for munmap() is not provided on SunOS. This needs to
* have a check added later to see if the GNU C library is being used.
* If so, then this prototype is not needed.
*/
#if defined(__sun__) && !defined(SVR4) && !defined(__SVR4)
extern int munmap( caddr_t addr, int len );
#endif
#include <sys/stat.h>
#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif
#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 */
/* */
/* We use the macro STREAM_File as a convenience to extract the */
/* system-specific stream handle from a given FreeType stream object */
#define STREAM_File(stream) ((void*)stream->descriptor.pointer)
#undef FT_COMPONENT
#define FT_COMPONENT trace_io
static
void ft_close_stream( FT_Stream stream )
{
munmap ( stream->descriptor.pointer, stream->size );
stream->descriptor.pointer = NULL;
stream->size = 0;
stream->base = 0;
}
extern
int FT_New_Stream( const char* filepathname,
FT_Stream stream )
{
int file;
struct stat stat_buf;
/* open the file */
file = open( filepathname, O_RDONLY );
if (file < 0)
{
FT_ERROR(( "FT.Unix.Open:" ));
FT_ERROR(( " could not open `%s'\n", filepathname ));
return FT_Err_Cannot_Open_Stream;
}
if (fstat( file, &stat_buf ) < 0)
{
FT_ERROR(( "FT.Unix.Open:" ));
FT_ERROR(( " could not `fstat' file `%s'\n", filepathname ));
goto Fail_Map;
}
stream->size = stat_buf.st_size;
stream->pos = 0;
stream->base = mmap( NULL,
stream->size,
PROT_READ,
MAP_FILE | MAP_PRIVATE,
file,
0 );
if ( (long)stream->base == -1 )
{
FT_ERROR(( "FT.Unix.Open:" ));
FT_ERROR(( " Could not map 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.Unix.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;
}
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;
}