/****************************************************************************
*
* ftsystem.c
*
* Unix-specific FreeType low-level system interface (body).
*
* Copyright (C) 1996-2023 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 FT_CONFIG_CONFIG_H
#include <freetype/internal/ftdebug.h>
#include <freetype/ftsystem.h>
#include <freetype/fterrors.h>
#include <freetype/fttypes.h>
#include <freetype/internal/ftstream.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>
#include <errno.h>
/**************************************************************************
*
* MEMORY MANAGEMENT INTERFACE
*
*/
/**************************************************************************
*
* It is not necessary to do any error checking for the
* allocation-related functions. This will be 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 )
{
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 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_by_munmap
*
* @Description:
* The function to close a stream which is opened by mmap.
*
* @Input:
* stream :: A pointer to the stream object.
*/
FT_CALLBACK_DEF( void )
ft_close_stream_by_munmap( FT_Stream stream )
{
munmap( (MUNMAP_ARG_CAST)stream->descriptor.pointer, stream->size );
stream->descriptor.pointer = NULL;
stream->size = 0;
stream->base = NULL;
}
/**************************************************************************
*
* @Function:
* ft_close_stream_by_free
*
* @Description:
* The function to close a stream which is created by ft_alloc.
*
* @Input:
* stream :: A pointer to the stream object.
*/
FT_CALLBACK_DEF( void )
ft_close_stream_by_free( FT_Stream stream )
{
ft_free( stream->memory, stream->descriptor.pointer );
stream->descriptor.pointer = NULL;
stream->size = 0;
stream->base = NULL;
}
/* 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_THROW( 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_THROW( Cannot_Open_Resource );
}
/* Here we ensure that a "fork" will _not_ duplicate */
/* our opened input streams on Unix. This is critical */
/* since it avoids some (possible) access control */
/* issues and cleans up the kernel file table a bit. */
/* */
#ifdef F_SETFD
#ifdef FD_CLOEXEC
(void)fcntl( file, F_SETFD, FD_CLOEXEC );
#else
(void)fcntl( file, F_SETFD, 1 );
#endif /* FD_CLOEXEC */
#endif /* F_SETFD */
if ( fstat( file, &stat_buf ) < 0 )
{
FT_ERROR(( "FT_Stream_Open:" ));
FT_ERROR(( " could not `fstat' file `%s'\n", filepathname ));
goto Fail_Map;
}
/* XXX: TODO -- real 64bit platform support */
/* */
/* `stream->size' is typedef'd to unsigned long (in `ftsystem.h'); */
/* `stat_buf.st_size', however, is usually typedef'd to off_t */
/* (in sys/stat.h). */
/* On some platforms, the former is 32bit and the latter is 64bit. */
/* To avoid overflow caused by fonts in huge files larger than */
/* 2GB, do a test. Temporary fix proposed by Sean McBride. */
/* */
if ( stat_buf.st_size > LONG_MAX )
{
FT_ERROR(( "FT_Stream_Open: file is too big\n" ));
goto Fail_Map;
}
else if ( stat_buf.st_size == 0 )
{
FT_ERROR(( "FT_Stream_Open: zero-length file\n" ));
goto Fail_Map;
}
/* This cast potentially truncates a 64bit to 32bit! */
stream->size = (unsigned long)stat_buf.st_size;
stream->pos = 0;
stream->base = (unsigned char *)mmap( NULL,
stream->size,
PROT_READ,
MAP_FILE | MAP_PRIVATE,
file,
0 );
if ( stream->base != MAP_FAILED )
stream->close = ft_close_stream_by_munmap;
else
{
ssize_t total_read_count;
FT_ERROR(( "FT_Stream_Open:" ));
FT_ERROR(( " could not `mmap' file `%s'\n", filepathname ));
stream->base = (unsigned char*)ft_alloc( stream->memory, stream->size );
if ( !stream->base )
{
FT_ERROR(( "FT_Stream_Open:" ));
FT_ERROR(( " could not `alloc' memory\n" ));
goto Fail_Map;
}
total_read_count = 0;
do
{
ssize_t read_count;
read_count = read( file,
stream->base + total_read_count,
stream->size - total_read_count );
if ( read_count <= 0 )
{
if ( read_count == -1 && errno == EINTR )
continue;
FT_ERROR(( "FT_Stream_Open:" ));
FT_ERROR(( " error while `read'ing file `%s'\n", filepathname ));
goto Fail_Read;
}
total_read_count += read_count;
} while ( (unsigned long)total_read_count != stream->size );
stream->close = ft_close_stream_by_free;
}
close( file );
stream->descriptor.pointer = stream->base;
stream->pathname.pointer = (char*)filepathname;
stream->read = NULL;
FT_TRACE1(( "FT_Stream_Open:" ));
FT_TRACE1(( " opened `%s' (%ld bytes) successfully\n",
filepathname, stream->size ));
return FT_Err_Ok;
Fail_Read:
ft_free( stream->memory, stream->base );
Fail_Map:
close( file );
stream->base = NULL;
stream->size = 0;
stream->pos = 0;
return FT_THROW( 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 = NULL;
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 */
