ref: 37379e2170f4e8c28bb9271929dcca76eab22a07
dir: /src/base/ftsystem.c/
/**************************************************************************
*
* ftsystem.h 1.0
*
* ANSI-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 1996-1999 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 <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 */
/* */
#define STREAM_FILE(stream) ((FILE*)stream->descriptor.pointer)
static
void ft_close_stream( FT_Stream stream )
{
fclose( STREAM_FILE(stream) );
}
static
unsigned long ft_io_stream( FT_Stream stream,
unsigned long offset,
char* buffer,
unsigned long count )
{
FILE* file;
file = STREAM_FILE(stream);
fseek( file, offset, SEEK_SET );
return (unsigned long)fread( buffer, 1, count, file );
}
extern
int FT_New_Stream( const char* filepathname,
FT_Stream stream )
{
FILE* file;
file = fopen( filepathname, "rb" );
if (!file)
return FT_Err_Cannot_Open_Resource;
fseek( file, 0, SEEK_END );
stream->size = ftell(file);
fseek( file, 0, SEEK_SET );
stream->descriptor.pointer = file;
stream->pos = 0;
stream->read = ft_io_stream;
stream->close = ft_close_stream;
return 0;
}
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;
}