/***************************************************************************/
/* */
/* ftsystem.c */
/* */
/* ANSI-specific FreeType low-level system interface (body). */
/* */
/* Copyright 1996-2001, 2002, 2006, 2008, 2009, 2010 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. */
/* */
/***************************************************************************/
/*************************************************************************/
/* */
/* This file contains the default interface used by FreeType to access */
/* low-level, i.e. memory management, i/o access as well as thread */
/* synchronisation. It can be replaced by user-specific routines if */
/* necessary. */
/* */
/*************************************************************************/
#include <ft2build.h>
#include FT_CONFIG_CONFIG_H
#include FT_INTERNAL_DEBUG_H
#include FT_INTERNAL_STREAM_H
#include FT_SYSTEM_H
#include FT_ERRORS_H
#include FT_TYPES_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 ft_smalloc( 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 ft_srealloc( 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 );
ft_sfree( 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 trace_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 ) ( (FT_FILE*)stream->descriptor.pointer )
/*************************************************************************/
/* */
/* <Function> */
/* ft_ansi_stream_close */
/* */
/* <Description> */
/* The function to close a stream. */
/* */
/* <Input> */
/* stream :: A pointer to the stream object. */
/* */
FT_CALLBACK_DEF( void )
ft_ansi_stream_close( FT_Stream stream )
{
ft_fclose( STREAM_FILE( stream ) );
stream->descriptor.pointer = NULL;
stream->size = 0;
stream->base = 0;
}
/*************************************************************************/
/* */
/* <Function> */
/* ft_ansi_stream_io */
/* */
/* <Description> */
/* The function to open a stream. */
/* */
/* <Input> */
/* stream :: A pointer to the stream object. */
/* */
/* offset :: The position in the data stream to start reading. */
/* */
/* buffer :: The address of buffer to store the read data. */
/* */
/* count :: The number of bytes to read from the stream. */
/* */
/* <Return> */
/* The number of bytes actually read. If `count' is zero (this is, */
/* the function is used for seeking), a non-zero return value */
/* indicates an error. */
/* */
FT_CALLBACK_DEF( unsigned long )
ft_ansi_stream_io( FT_Stream stream,
unsigned long offset,
unsigned char* buffer,
unsigned long count )
{
FT_FILE* file;
if ( !count && offset > stream->size )
return 1;
file = STREAM_FILE( stream );
if ( stream->pos != offset )
ft_fseek( file, offset, SEEK_SET );
return (unsigned long)ft_fread( buffer, 1, count, file );
}
/* documentation is in ftstream.h */
FT_BASE_DEF( FT_Error )
FT_Stream_Open( FT_Stream stream,
const char* filepathname )
{
FT_FILE* file;
if ( !stream )
return FT_Err_Invalid_Stream_Handle;
file = ft_fopen( filepathname, "rb" );
if ( !file )
{
FT_ERROR(( "FT_Stream_Open:"
" could not open `%s'\n", filepathname ));
return FT_Err_Cannot_Open_Resource;
}
ft_fseek( file, 0, SEEK_END );
stream->size = ft_ftell( file );
ft_fseek( file, 0, SEEK_SET );
stream->descriptor.pointer = file;
stream->pathname.pointer = (char*)filepathname;
stream->pos = 0;
stream->read = ft_ansi_stream_io;
stream->close = ft_ansi_stream_close;
FT_TRACE1(( "FT_Stream_Open:" ));
FT_TRACE1(( " opened `%s' (%d bytes) successfully\n",
filepathname, stream->size ));
return FT_Err_Ok;
}
#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)ft_smalloc( 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
ft_sfree( memory );
}
/* END */
Submit an article or tip