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54876
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/****************************************************************************
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*
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* ftsystem.c
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*
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* ANSI-specific FreeType low-level system interface (body).
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*
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* Copyright (C) 1996-2019 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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49234
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54876
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/**************************************************************************
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*
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* This file contains the default interface used by FreeType to access
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* low-level, i.e. memory management, i/o access as well as thread
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* synchronisation. It can be replaced by user-specific routines if
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* necessary.
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*
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*/
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49234
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#include <ft2build.h>
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#include FT_CONFIG_CONFIG_H
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#include FT_INTERNAL_DEBUG_H
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#include FT_INTERNAL_STREAM_H
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#include FT_SYSTEM_H
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#include FT_ERRORS_H
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#include FT_TYPES_H
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54876
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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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49234
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54876
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/**************************************************************************
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*
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* It is not necessary to do any error checking for the
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* allocation-related functions. This will be done by the higher level
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* routines like ft_mem_alloc() or ft_mem_realloc().
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*
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*/
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49234
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54876
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/**************************************************************************
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*
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* @Function:
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* ft_alloc
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*
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* @Description:
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* The memory allocation function.
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*
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* @Input:
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* memory ::
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* A pointer to the memory object.
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*
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* size ::
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* The requested size in bytes.
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*
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* @Return:
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* The address of newly allocated block.
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*/
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49234
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FT_CALLBACK_DEF( void* )
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ft_alloc( FT_Memory memory,
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long size )
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{
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FT_UNUSED( memory );
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return ft_smalloc( (size_t)size );
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}
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/**************************************************************************
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*
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* @Function:
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* ft_realloc
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*
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* @Description:
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* The memory reallocation function.
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*
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* @Input:
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* memory ::
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* A pointer to the memory object.
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*
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* cur_size ::
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* The current size of the allocated memory block.
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*
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* new_size ::
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* The newly requested size in bytes.
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*
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* block ::
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* The current address of the block in memory.
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*
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* @Return:
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* The address of the reallocated memory block.
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*/
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FT_CALLBACK_DEF( void* )
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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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FT_UNUSED( memory );
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FT_UNUSED( cur_size );
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return ft_srealloc( block, (size_t)new_size );
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}
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/**************************************************************************
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*
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* @Function:
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* ft_free
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*
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* @Description:
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* The memory release function.
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*
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* @Input:
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* memory ::
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* A pointer to the memory object.
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*
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* block ::
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* The address of block in memory to be freed.
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*/
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FT_CALLBACK_DEF( void )
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ft_free( FT_Memory memory,
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void* block )
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{
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FT_UNUSED( memory );
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ft_sfree( 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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*/
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49234
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#ifndef FT_CONFIG_OPTION_DISABLE_STREAM_SUPPORT
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/**************************************************************************
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*
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* The macro FT_COMPONENT is used in trace mode. It is an implicit
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* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log
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* messages during execution.
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*/
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#undef FT_COMPONENT
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#define FT_COMPONENT io
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/* We use the macro STREAM_FILE for convenience to extract the */
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/* system-specific stream handle from a given FreeType stream object */
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#define STREAM_FILE( stream ) ( (FT_FILE*)stream->descriptor.pointer )
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54876
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/**************************************************************************
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*
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* @Function:
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* ft_ansi_stream_close
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*
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* @Description:
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* The function to close a stream.
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*
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* @Input:
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* stream ::
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* A pointer to the stream object.
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*/
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FT_CALLBACK_DEF( void )
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ft_ansi_stream_close( FT_Stream stream )
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{
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ft_fclose( STREAM_FILE( stream ) );
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stream->descriptor.pointer = NULL;
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stream->size = 0;
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stream->base = NULL;
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}
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/**************************************************************************
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*
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* @Function:
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* ft_ansi_stream_io
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*
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* @Description:
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* The function to open a stream.
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*
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* @Input:
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* stream ::
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* A pointer to the stream object.
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*
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* offset ::
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* The position in the data stream to start reading.
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*
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* buffer ::
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* The address of buffer to store the read data.
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*
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* count ::
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* The number of bytes to read from the stream.
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*
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* @Return:
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* The number of bytes actually read. If `count' is zero (this is,
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* the function is used for seeking), a non-zero return value
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* indicates an error.
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*/
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FT_CALLBACK_DEF( unsigned long )
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ft_ansi_stream_io( FT_Stream stream,
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unsigned long offset,
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unsigned char* buffer,
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unsigned long count )
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{
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FT_FILE* file;
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if ( !count && offset > stream->size )
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return 1;
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file = STREAM_FILE( stream );
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if ( stream->pos != offset )
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ft_fseek( file, (long)offset, SEEK_SET );
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return (unsigned long)ft_fread( buffer, 1, count, file );
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}
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/* documentation is in ftstream.h */
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FT_BASE_DEF( FT_Error )
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FT_Stream_Open( FT_Stream stream,
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const char* filepathname )
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{
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FT_FILE* file;
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if ( !stream )
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return FT_THROW( Invalid_Stream_Handle );
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stream->descriptor.pointer = NULL;
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stream->pathname.pointer = (char*)filepathname;
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stream->base = NULL;
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stream->pos = 0;
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stream->read = NULL;
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stream->close = NULL;
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file = ft_fopen( filepathname, "rb" );
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if ( !file )
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{
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FT_ERROR(( "FT_Stream_Open:"
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" could not open `%s'\n", filepathname ));
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return FT_THROW( Cannot_Open_Resource );
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}
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ft_fseek( file, 0, SEEK_END );
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stream->size = (unsigned long)ft_ftell( file );
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if ( !stream->size )
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{
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FT_ERROR(( "FT_Stream_Open:" ));
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FT_ERROR(( " opened `%s' but zero-sized\n", filepathname ));
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ft_fclose( file );
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return FT_THROW( Cannot_Open_Stream );
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}
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ft_fseek( file, 0, SEEK_SET );
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stream->descriptor.pointer = file;
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stream->read = ft_ansi_stream_io;
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stream->close = ft_ansi_stream_close;
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FT_TRACE1(( "FT_Stream_Open:" ));
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FT_TRACE1(( " opened `%s' (%d bytes) successfully\n",
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filepathname, stream->size ));
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return FT_Err_Ok;
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}
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#endif /* !FT_CONFIG_OPTION_DISABLE_STREAM_SUPPORT */
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#ifdef FT_DEBUG_MEMORY
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extern FT_Int
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ft_mem_debug_init( FT_Memory memory );
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extern void
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ft_mem_debug_done( FT_Memory memory );
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#endif
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/* documentation is in ftobjs.h */
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FT_BASE_DEF( FT_Memory )
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FT_New_Memory( void )
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{
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FT_Memory memory;
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memory = (FT_Memory)ft_smalloc( sizeof ( *memory ) );
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if ( memory )
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{
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memory->user = NULL;
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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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#ifdef FT_DEBUG_MEMORY
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ft_mem_debug_init( memory );
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#endif
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}
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return memory;
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}
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/* documentation is in ftobjs.h */
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FT_BASE_DEF( void )
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FT_Done_Memory( FT_Memory memory )
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{
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#ifdef FT_DEBUG_MEMORY
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ft_mem_debug_done( memory );
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#endif
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ft_sfree( memory );
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}
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/* END */
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