ref: 967a34eee3fd34f496366ed1283ab5268d23690a
dir: /builds/windows/ftsystem.c/
/****************************************************************************
*
* ftsystem.c
*
* Windows-specific FreeType low-level system interface (body).
*
* Copyright (C) 2021 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 */
#include <windows.h>
#include <stdlib.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 )
{
UnmapViewOfFile( (LPCVOID)stream->descriptor.pointer );
stream->descriptor.pointer = NULL;
stream->size = 0;
stream->base = 0;
}
/**************************************************************************
*
* @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( NULL, stream->descriptor.pointer );
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 )
{
HANDLE file;
HANDLE fm;
LARGE_INTEGER size;
if ( !stream )
return FT_THROW( Invalid_Stream_Handle );
/* open the file */
file = CreateFileA( filepathname, GENERIC_READ, FILE_SHARE_READ, NULL,
OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0 );
if ( file == INVALID_HANDLE_VALUE )
{
FT_ERROR(( "FT_Stream_Open:" ));
FT_ERROR(( " could not open `%s'\n", filepathname ));
return FT_THROW( Cannot_Open_Resource );
}
if ( GetFileSizeEx( file, &size ) == FALSE )
{
FT_ERROR(( "FT_Stream_Open:" ));
FT_ERROR(( " could not retrieve size of file `%s'\n", filepathname ));
goto Fail_Open;
}
/* `stream->size' is typedef'd to unsigned long (in `ftsystem.h'); */
/* So avoid overflow caused by fonts in huge files larger than */
/* 2GB, do a test. */
if ( size.QuadPart > LONG_MAX )
{
FT_ERROR(( "FT_Stream_Open: file is too big\n" ));
goto Fail_Open;
}
else if ( size.QuadPart == 0 )
{
FT_ERROR(( "FT_Stream_Open: zero-length file\n" ));
goto Fail_Open;
}
fm = CreateFileMapping( file, NULL, PAGE_READONLY, 0, 0, NULL );
if ( fm == NULL )
{
FT_ERROR(( "FT_Stream_Open: can not map file\n" ));
goto Fail_Open;
}
/* Store only the low part of this 64 bits integer because long is */
/* a 32 bits type. Anyway, a check has been done above to forbid */
/* a size greater than LONG_MAX */
stream->size = size.LowPart;
stream->pos = 0;
stream->base = (unsigned char *)
MapViewOfFile( fm, FILE_MAP_READ, 0, 0, 0 );
CloseHandle( fm );
if ( stream->base != NULL )
stream->close = ft_close_stream_by_munmap;
else
{
DWORD total_read_count;
FT_ERROR(( "FT_Stream_Open:" ));
FT_ERROR(( " could not `mmap' file `%s'\n", filepathname ));
stream->base = (unsigned char*)ft_alloc( NULL, 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
{
DWORD read_count;
if ( ReadFile( file,
stream->base + total_read_count,
stream->size - total_read_count,
&read_count, NULL ) == FALSE )
{
FT_ERROR(( "FT_Stream_Open:" ));
FT_ERROR(( " error while `read'ing file `%s'\n", filepathname ));
goto Fail_Read;
}
total_read_count += read_count;
} while ( total_read_count != stream->size );
stream->close = ft_close_stream_by_free;
}
CloseHandle( file );
stream->descriptor.pointer = stream->base;
stream->pathname.pointer = (char*)filepathname;
stream->read = 0;
FT_TRACE1(( "FT_Stream_Open:" ));
FT_TRACE1(( " opened `%s' (%ld bytes) successfully\n",
filepathname, stream->size ));
return FT_Err_Ok;
Fail_Read:
ft_free( NULL, stream->base );
Fail_Map:
CloseHandle( file );
Fail_Open:
CloseHandle( 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 = 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 */