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kc3-lang/freetype/builds/unix/ftsystem.c
Werner Lemberg
- builds/unix/ftsystem.c
-
/**************************************************************************** * * ftsystem.c * * Unix-specific FreeType low-level system interface (body). * * Copyright (C) 1996-2025 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 <ft2build.h> /* we use our special ftconfig.h file, not the standard one */ #include FT_CONFIG_CONFIG_H #include <freetype/internal/ftdebug.h> #include <freetype/ftsystem.h> #include <freetype/fterrors.h> #include <freetype/fttypes.h> #include <freetype/internal/ftstream.h> /* memory-mapping includes and definitions */ #ifdef HAVE_UNISTD_H #include <unistd.h> #endif #include <sys/mman.h> #ifndef MAP_FILE #define MAP_FILE 0x00 #endif #ifdef MUNMAP_USES_VOIDP #define MUNMAP_ARG_CAST void * #else #define MUNMAP_ARG_CAST char * #endif #ifdef NEED_MUNMAP_DECL #ifdef __cplusplus extern "C" #else extern #endif int munmap( char* addr, int len ); #define MUNMAP_ARG_CAST char * #endif /* NEED_DECLARATION_MUNMAP */ #include <sys/types.h> #include <sys/stat.h> #ifdef HAVE_FCNTL_H #include <fcntl.h> #endif #include <stdio.h> #include <stdlib.h> #include <string.h> #include <errno.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 malloc( 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 realloc( 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 ); free( 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 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 ) ( (FILE*)stream->descriptor.pointer ) /************************************************************************** * * @Function: * ft_close_stream_by_munmap * * @Description: * The function to close a stream which is opened by mmap. * * @Input: * stream :: A pointer to the stream object. */ FT_CALLBACK_DEF( void ) ft_close_stream_by_munmap( FT_Stream stream ) { munmap( (MUNMAP_ARG_CAST)stream->descriptor.pointer, stream->size ); stream->descriptor.pointer = NULL; stream->size = 0; stream->base = NULL; } /************************************************************************** * * @Function: * ft_close_stream_by_free * * @Description: * The function to close a stream which is created by ft_alloc. * * @Input: * stream :: A pointer to the stream object. */ FT_CALLBACK_DEF( void ) ft_close_stream_by_free( FT_Stream stream ) { ft_free( stream->memory, stream->descriptor.pointer ); stream->descriptor.pointer = NULL; stream->size = 0; stream->base = NULL; } /* documentation is in ftobjs.h */ FT_BASE_DEF( FT_Error ) FT_Stream_Open( FT_Stream stream, const char* filepathname ) { int file; struct stat stat_buf; if ( !stream ) return FT_THROW( Invalid_Stream_Handle ); /* open the file */ file = open( filepathname, O_RDONLY ); if ( file < 0 ) { FT_ERROR(( "FT_Stream_Open:" )); FT_ERROR(( " could not open `%s'\n", filepathname )); return FT_THROW( Cannot_Open_Resource ); } /* Here we ensure that a "fork" will _not_ duplicate */ /* our opened input streams on Unix. This is critical */ /* since it avoids some (possible) access control */ /* issues and cleans up the kernel file table a bit. */ /* */ #ifdef F_SETFD #ifdef FD_CLOEXEC (void)fcntl( file, F_SETFD, FD_CLOEXEC ); #else (void)fcntl( file, F_SETFD, 1 ); #endif /* FD_CLOEXEC */ #endif /* F_SETFD */ if ( fstat( file, &stat_buf ) < 0 ) { FT_ERROR(( "FT_Stream_Open:" )); FT_ERROR(( " could not `fstat' file `%s'\n", filepathname )); goto Fail_Map; } /* XXX: TODO -- real 64bit platform support */ /* */ /* `stream->size' is typedef'd to unsigned long (in `ftsystem.h'); */ /* `stat_buf.st_size', however, is usually typedef'd to off_t */ /* (in sys/stat.h). */ /* On some platforms, the former is 32bit and the latter is 64bit. */ /* To avoid overflow caused by fonts in huge files larger than */ /* 2GB, do a test. Temporary fix proposed by Sean McBride. */ /* */ if ( stat_buf.st_size > LONG_MAX ) { FT_ERROR(( "FT_Stream_Open: file is too big\n" )); goto Fail_Map; } else if ( stat_buf.st_size == 0 ) { FT_ERROR(( "FT_Stream_Open: zero-length file\n" )); goto Fail_Map; } /* This cast potentially truncates a 64bit to 32bit! */ stream->size = (unsigned long)stat_buf.st_size; stream->pos = 0; stream->base = (unsigned char *)mmap( NULL, stream->size, PROT_READ, MAP_FILE | MAP_PRIVATE, file, 0 ); if ( stream->base != MAP_FAILED ) stream->close = ft_close_stream_by_munmap; else { ssize_t total_read_count; FT_ERROR(( "FT_Stream_Open:" )); FT_ERROR(( " could not `mmap' file `%s'\n", filepathname )); stream->base = (unsigned char*)ft_alloc( stream->memory, stream->size ); if ( !stream->base ) { FT_ERROR(( "FT_Stream_Open:" )); FT_ERROR(( " could not `alloc' memory\n" )); goto Fail_Map; } total_read_count = 0; do { ssize_t read_count; read_count = read( file, stream->base + total_read_count, stream->size - total_read_count ); if ( read_count <= 0 ) { if ( read_count == -1 && errno == EINTR ) continue; FT_ERROR(( "FT_Stream_Open:" )); FT_ERROR(( " error while `read'ing file `%s'\n", filepathname )); goto Fail_Read; } total_read_count += read_count; } while ( (unsigned long)total_read_count != stream->size ); stream->close = ft_close_stream_by_free; } close( file ); stream->descriptor.pointer = stream->base; stream->pathname.pointer = (char*)filepathname; stream->read = NULL; FT_TRACE1(( "FT_Stream_Open:" )); FT_TRACE1(( " opened `%s' (%ld bytes) successfully\n", filepathname, stream->size )); return FT_Err_Ok; Fail_Read: ft_free( stream->memory, stream->base ); Fail_Map: close( file ); stream->base = NULL; stream->size = 0; stream->pos = 0; return FT_THROW( Cannot_Open_Stream ); } #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)malloc( sizeof ( *memory ) ); if ( memory ) { memory->user = NULL; 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 memory->free( memory, memory ); } /* END */