ref: 82fd32d67426f4d58663d3d382478473c95ac27c
dir: /builds/windows/ftsystem.c/
/**************************************************************************** * * ftsystem.c * * Windows-specific FreeType low-level system interface (body). * * Copyright (C) 2021 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 */ #include <windows.h> #include <stdlib.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 ) { UnmapViewOfFile( (LPCVOID)stream->descriptor.pointer ); stream->descriptor.pointer = NULL; stream->size = 0; stream->base = 0; } /************************************************************************** * * @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( NULL, stream->descriptor.pointer ); stream->descriptor.pointer = NULL; stream->size = 0; stream->base = 0; } /* documentation is in ftobjs.h */ FT_BASE_DEF( FT_Error ) FT_Stream_Open( FT_Stream stream, const char* filepathname ) { HANDLE file; HANDLE fm; LARGE_INTEGER size; if ( !stream ) return FT_THROW( Invalid_Stream_Handle ); /* open the file */ file = CreateFileA( filepathname, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0 ); if ( file == INVALID_HANDLE_VALUE ) { FT_ERROR(( "FT_Stream_Open:" )); FT_ERROR(( " could not open `%s'\n", filepathname )); return FT_THROW( Cannot_Open_Resource ); } if ( GetFileSizeEx( file, &size ) == FALSE ) { FT_ERROR(( "FT_Stream_Open:" )); FT_ERROR(( " could not retrieve size of file `%s'\n", filepathname )); goto Fail_Open; } /* `stream->size' is typedef'd to unsigned long (in `ftsystem.h'); */ /* So avoid overflow caused by fonts in huge files larger than */ /* 2GB, do a test. */ if ( size.QuadPart > LONG_MAX ) { FT_ERROR(( "FT_Stream_Open: file is too big\n" )); goto Fail_Open; } else if ( size.QuadPart == 0 ) { FT_ERROR(( "FT_Stream_Open: zero-length file\n" )); goto Fail_Open; } fm = CreateFileMapping( file, NULL, PAGE_READONLY, 0, 0, NULL ); if ( fm == NULL ) { FT_ERROR(( "FT_Stream_Open: can not map file\n" )); goto Fail_Open; } /* Store only the low part of this 64 bits integer because long is */ /* a 32 bits type. Anyway, a check has been done above to forbid */ /* a size greater than LONG_MAX */ stream->size = size.LowPart; stream->pos = 0; stream->base = (unsigned char *) MapViewOfFile( fm, FILE_MAP_READ, 0, 0, 0 ); CloseHandle( fm ); if ( stream->base != NULL ) stream->close = ft_close_stream_by_munmap; else { DWORD total_read_count; FT_ERROR(( "FT_Stream_Open:" )); FT_ERROR(( " could not `mmap' file `%s'\n", filepathname )); stream->base = (unsigned char*)ft_alloc( NULL, 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 { DWORD read_count; if ( ReadFile( file, stream->base + total_read_count, stream->size - total_read_count, &read_count, NULL ) == FALSE ) { FT_ERROR(( "FT_Stream_Open:" )); FT_ERROR(( " error while `read'ing file `%s'\n", filepathname )); goto Fail_Read; } total_read_count += read_count; } while ( total_read_count != stream->size ); stream->close = ft_close_stream_by_free; } CloseHandle( file ); stream->descriptor.pointer = stream->base; stream->pathname.pointer = (char*)filepathname; stream->read = 0; FT_TRACE1(( "FT_Stream_Open:" )); FT_TRACE1(( " opened `%s' (%ld bytes) successfully\n", filepathname, stream->size )); return FT_Err_Ok; Fail_Read: ft_free( NULL, stream->base ); Fail_Map: CloseHandle( file ); Fail_Open: CloseHandle( 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 = 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 memory->free( memory, memory ); } /* END */