215 lines
6.1 KiB
C
215 lines
6.1 KiB
C
/**************************************************************************
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*
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* ftsystem.h 1.0
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*
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* ANSI-specific FreeType low-level system interface
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*
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* This file contains the definition of interface used by FreeType
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* to access low-level, i.e. memory management, i/o access as well
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* as thread synchronisation.
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*
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*
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* Copyright 1996-1999 by
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* David Turner, Robert Wilhelm, and Werner Lemberg
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*
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* This file is part of the FreeType project, and may only be used
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* modified and distributed under the terms of the FreeType project
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* license, LICENSE.TXT. By continuing to use, modify, or distribute
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* this file you indicate that you have read the license and
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* understand and accept it fully.
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*
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**************************************************************************/
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#include <ftsystem.h>
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#include <fterrors.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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/*********************************************************************/
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/* */
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/* MEMORY MANAGEMENT INTERFACE */
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/* */
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/************************************************************************
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*
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* <FuncType>
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* FT_Alloc_Func
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*
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* <Description>
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* The memory allocator function type
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*
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* <Input>
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* system :: pointer to the system object
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* size :: requested size in bytes
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*
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* <Output>
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* block :: address of newly allocated block
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*
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* <Return>
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* Error code. 0 means success.
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*
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* <Note>
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* If your allocation routine ALWAYS zeroes the new block, you
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* should set the flag FT_SYSTEM_FLAG_ALLOC_ZEROES in your system
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* object 'flags' field.
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*
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* If you have set the flag FT_SYSTEM_FLAG_REPORT_CURRENT_ALLOC in
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* your system's "system_flags" field, this function should update
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* the "current_alloc" field of the system object.
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*
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************************************************************************/
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static
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void* ft_alloc( FT_Memory memory,
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long size )
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{
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(void)memory;
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return malloc(size);
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}
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/************************************************************************
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*
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* <FuncType>
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* FT_Realloc_Func
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*
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* <Description>
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* The memory reallocator function type
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*
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* <Input>
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* system :: pointer to the system object
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* new_size :: new requested size in bytes
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*
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* <InOut>
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* block :: address of block in memory
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*
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* <Return>
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* Error code. 0 means success.
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*
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* <Note>
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* This function is _never_ called when the system flag
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* FT_SYSTEM_FLAG_NO_REALLOC is set. Instead, the engine will emulate
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* realloc through "alloc" and "free".
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*
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* Note that this is possible due to the fact that FreeType's
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* "FT_Realloc" always requests the _current_ size of the reallocated
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* block as a parameter, thus avoiding memory leaks.
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*
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* If you have set the flag FT_SYSTEM_FLAG_REPORT_CURRENT_ALLOC in
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* your system's "system_flags" field, this function should update
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* the "current_alloc" field of the system object.
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*
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************************************************************************/
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static
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void* ft_realloc( FT_Memory memory,
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long cur_size,
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long new_size,
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void* block )
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{
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(void)memory;
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(void)cur_size;
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return realloc( block, new_size );
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}
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/************************************************************************
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*
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* <FuncType>
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* FT_Free_Func
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*
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* <Description>
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* The memory release function type
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*
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* <Input>
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* system :: pointer to the system object
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* block :: address of block in memory
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*
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* <Note>
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* If you have set the flag FT_SYSTEM_FLAG_REPORT_CURRENT_ALLOC in
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* your system's "system_flags" field, this function should update
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* the "current_alloc" field of the system object.
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*
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************************************************************************/
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static
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void ft_free( FT_Memory memory,
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void* block )
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{
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(void)memory;
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free( block );
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}
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/*********************************************************************/
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/* */
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/* RESOURCE MANAGEMENT INTERFACE */
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/* */
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#define STREAM_FILE(stream) ((FILE*)stream->descriptor.pointer)
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static
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void ft_close_stream( FT_Stream stream )
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{
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fclose( STREAM_FILE(stream) );
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}
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static
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unsigned long ft_io_stream( FT_Stream stream,
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unsigned long offset,
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char* buffer,
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unsigned long count )
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{
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FILE* file;
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file = STREAM_FILE(stream);
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fseek( file, offset, SEEK_SET );
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return (unsigned long)fread( buffer, 1, count, file );
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}
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extern
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int FT_New_Stream( const char* filepathname,
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FT_Stream stream )
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{
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FILE* file;
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file = fopen( filepathname, "rb" );
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if (!file)
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return FT_Err_Cannot_Open_Resource;
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fseek( file, 0, SEEK_END );
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stream->size = ftell(file);
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fseek( file, 0, SEEK_SET );
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stream->descriptor.pointer = file;
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stream->pos = 0;
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stream->read = ft_io_stream;
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stream->close = ft_close_stream;
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return 0;
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}
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extern
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FT_Memory FT_New_Memory( void )
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{
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FT_Memory memory;
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memory = (FT_Memory)malloc( sizeof(*memory) );
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if (memory)
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{
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memory->user = 0;
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memory->alloc = ft_alloc;
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memory->realloc = ft_realloc;
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memory->free = ft_free;
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}
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return memory;
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}
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