335 lines
14 KiB
C
335 lines
14 KiB
C
/***************************************************************************/
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/* */
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/* ftsystem.c */
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/* */
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/* Unix-specific FreeType low-level system interface (body). */
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/* */
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/* Copyright 1996-2000 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 <ftconfig.h>
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#include <freetype/internal/ftdebug.h>
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#include <freetype/ftsystem.h>
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#include <freetype/fterrors.h>
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#include <freetype/fttypes.h>
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#include <freetype/internal/ftobjs.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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/* memory-mapping includes and definitions */
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#include <sys/mman.h>
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#ifndef MAP_FILE
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#define MAP_FILE 0x00
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#endif
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#ifdef MUNMAP_USES_VOIDP
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#define MUNMAP_ARG_CAST void *
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#else
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#define MUNMAP_ARG_CAST char *
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#endif
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#ifdef NEED_MUNMAP_DECL
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#ifdef __cplusplus
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extern "C"
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#else
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extern
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#endif
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int munmap( char* addr,
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int len );
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#define MUNMAP_ARG_CAST char *
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#endif /* NEED_DECLARATION_MUNMAP */
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#include <sys/stat.h>
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#ifdef HAVE_FCNTL_H
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#include <fcntl.h>
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#endif
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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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/* */
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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 :: A pointer to the memory object. */
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/* size :: The requested size in bytes. */
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/* */
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/* <Return> */
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/* block :: The address of newly allocated block. */
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/* */
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FT_CALLBACK_DEF
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void* 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 malloc( 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 :: A pointer to the memory object. */
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/* */
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/* cur_size :: The current size of the allocated memory block. */
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/* */
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/* new_size :: The newly requested size in bytes. */
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/* */
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/* block :: 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
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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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FT_UNUSED( memory );
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FT_UNUSED( 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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/* <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 :: A pointer to the memory object. */
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/* */
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/* block :: The address of block in memory to be freed. */
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/* */
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FT_CALLBACK_DEF
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void 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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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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/*************************************************************************/
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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 trace_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 ) ( (FILE*)stream->descriptor.pointer )
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/*************************************************************************/
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/* */
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/* <Function> */
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/* ft_close_stream */
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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 :: A pointer to the stream object. */
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/* */
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FT_CALLBACK_DEF
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void ft_close_stream( FT_Stream stream )
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{
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munmap( (MUNMAP_ARG_CAST)stream->descriptor.pointer, stream->size );
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stream->descriptor.pointer = NULL;
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stream->size = 0;
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stream->base = 0;
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}
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/*************************************************************************/
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/* */
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/* <Function> */
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/* FT_New_Stream */
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/* */
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/* <Description> */
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/* Creates a new stream object. */
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/* */
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/* <Input> */
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/* filepathname :: The name of the stream (usually a file) to be */
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/* opened. */
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/* */
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/* stream :: A pointer to the stream object. */
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/* */
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/* <Return> */
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/* FreeType error code. 0 means success. */
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/* */
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FT_EXPORT_DEF( FT_Error ) FT_New_Stream( const char* filepathname,
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FT_Stream stream )
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{
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int file;
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struct stat stat_buf;
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if ( !stream )
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return FT_Err_Invalid_Stream_Handle;
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/* open the file */
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file = open( filepathname, O_RDONLY );
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if ( file < 0 )
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{
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FT_ERROR(( "FT_New_Stream:" ));
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FT_ERROR(( " could not open `%s'\n", filepathname ));
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return FT_Err_Cannot_Open_Resource;
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}
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if ( fstat( file, &stat_buf ) < 0 )
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{
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FT_ERROR(( "FT_New_Stream:" ));
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FT_ERROR(( " could not `fstat' file `%s'\n", filepathname ));
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goto Fail_Map;
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}
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stream->size = stat_buf.st_size;
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stream->pos = 0;
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stream->base = (unsigned char *)mmap( NULL,
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stream->size,
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PROT_READ,
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MAP_FILE | MAP_PRIVATE,
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file,
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0 );
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if ( (long)stream->base == -1 )
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{
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FT_ERROR(( "FT_New_Stream:" ));
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FT_ERROR(( " could not `mmap' file `%s'\n", filepathname ));
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goto Fail_Map;
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}
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close( file );
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stream->descriptor.pointer = stream->base;
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stream->pathname.pointer = (char*)filepathname;
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stream->close = ft_close_stream;
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stream->read = 0;
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FT_TRACE1(( "FT_New_Stream:" ));
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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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Fail_Map:
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close( file );
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stream->base = NULL;
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stream->size = 0;
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stream->pos = 0;
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return FT_Err_Cannot_Open_Stream;
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}
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/*************************************************************************/
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/* */
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/* <Function> */
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/* FT_New_Memory */
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/* */
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/* <Description> */
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/* Creates a new memory object. */
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/* */
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/* <Return> */
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/* A pointer to the new memory object. 0 in case of error. */
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/* */
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FT_EXPORT_DEF( 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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/*************************************************************************/
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/* */
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/* <Function> */
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/* FT_Done_Memory */
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/* */
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/* <Description> */
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/* Discards memory manager. */
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/* */
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/* <Input> */
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/* memory :: A handle to the memory manager. */
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/* */
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FT_EXPORT_DEF( void ) FT_Done_Memory( FT_Memory memory )
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{
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free( memory );
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}
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/* END */
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