ref: 3983d95f3e88d30c09fb9ecae056e58fcadef326
dir: /config/os2/ftsys.c/
/***************************************************************************/
/* */
/* ftsys.c */
/* */
/* OS/2-specific system operations (body). */
/* */
/* Copyright 1996-1999 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. */
/* */
/***************************************************************************/
/*************************************************************************/
/* */
/* This implementation of the `ftsys' component uses malloc()/free() for */
/* memory management, and the OS/2 DosXXXXX() API functionss for file */
/* access. */
/* */
/* IMPORTANT NOTE: */
/* */
/* Porters, read carefully the comments in ftsys.h before trying to */
/* port this file to your system. It contains many essential */
/* remarks, and will ease your work greatly. */
/* */
/*************************************************************************/
#include "ftsys.h"
#include "ftstream.h"
#include "ftdebug.h"
#include <os2.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
/*************************************************************************/
/* The macro FT_COMPONENT is used in trace mode. It is an implicit */
/* parameter of the PTRACE() and PERROR() macros, used to print/log */
/* messages during execution. */
/* */
#undef FT_COMPONENT
#define FT_COMPONENT trace_io
#undef CUR_SYSTEM /* just in case */
/*************************************************************************/
/* */
/* To ease porting, we use the macro SYS_STREAM to name the */
/* system-specific stream type. For example, it is a `FILE*' with the */
/* ANSI libc, it will be a file descriptor, i.e. an integer, when using */
/* the Unix system API, etc. */
/* */
#define SYS_STREAM HFILE
/*************************************************************************/
/* */
/* I/O ACCESS AND MANAGEMENT */
/* */
/* We only define the `ANSI' resource class in this class. It is */
/* disk-based and provides a MRU cache in order to only keep the file */
/* descriptors of the 10 most recently used resource files. */
/* */
/* It simply contains two lists. One contains the `cached' resources */
/* with a valid FILE* pointer, the second contains all other `flushed' */
/* resource objects. */
/* */
/*************************************************************************/
/*************************************************************************/
/* */
/* <Struct> */
/* FT_Os2FileRec */
/* */
/* <Description> */
/* The FT_Os2File class derives from FT_ResourceRec. */
/* */
/* <Fields> */
/* root :: The root resource class fields. */
/* */
/* pathname :: This is a copy of the ANSI file pathname used to open */
/* streams for the resource. A different implementation */
/* is free to use Unicode chars, or file i-node numbers, */
/* etc. */
/* */
/* file_size :: The size in bytes of the resource. This field should */
/* be set to -1 until the resource is first opened. */
/* */
typedef struct FT_Os2FileRec_
{
FT_ResourceRec root;
char* pathname; /* the font file's pathname */
FT_Long file_size; /* file size in bytes */
} FT_Os2FileRec, *FT_Os2File;
/*************************************************************************/
/* */
/* We use the macro STREAM_Name() as a convenience to return a given */
/* ANSI resource's pathname. Its `stream' argument is a FT_Resource */
/* which is typecasted to the FT_Os2File class. */
/* */
#define STREAM_Name( stream ) ((FT_Os2File)stream->resource)->pathname
/*************************************************************************/
/* */
/* We use the macro STREAM_File() as a convenience to extract the */
/* system-specific stream handle from a given FreeType stream object. */
/* */
#define STREAM_File(stream) ((HFILE)stream->stream_id.pointer)
/*************************************************************************/
/* */
/* <Function> */
/* Os2File_Open */
/* */
/* <Description> */
/* This function is used to open a system-stream for a given */
/* resource. */
/* */
/* Note that it must update the target FreeType stream object with */
/* the system-stream handle and the resource's size. */
/* */
/* Also, the `stream->base' field must be set to NULL for disk-based */
/* resources, and to the address in memory of the resource's first */
/* byte for memory-based ones. */
/* */
/* <Input> */
/* resource :: The source resource. */
/* stream :: The target stream object. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
/* <Note> */
/* The stream object IS NOT CREATED by this function, but by its */
/* caller. */
/* */
static
FT_Error Os2File_Open( FT_Os2File resource,
FT_Stream stream )
{
HFILE file;
ULONG ulAction;
/* open the file */
#ifdef __EMX__
if ( DosOpen( (FT_Byte*)resource->pathname,
&file,
&ulAction, 0, 0, OPEN_ACTION_OPEN_IF_EXISTS,
OPEN_SHARE_DENYNONE | OPEN_ACCESS_READONLY,
NULL ) )
#else
if ( DosOpen( resource->pathname,
&file,
&ulAction, 0, 0, OPEN_ACTION_OPEN_IF_EXISTS,
OPEN_SHARE_DENYNONE | OPEN_ACCESS_READONLY,
NULL ) )
#endif /* __EMX__ */
{
PERROR(( "Os2File_Open: Could not open file `%s'\n",
resource->pathname ));
return FT_Err_Cannot_Open_Stream;
}
/* compute file size if necessary */
if ( resource->file_size < 0 )
{
DosSetFilePtr( file, 0, FILE_END, (ULONG*)&resource->file_size );
DosSetFilePtr( file, 0, FILE_BEGIN, &ulAction );
}
stream->resource = (FT_Resource)resource;
stream->stream_id.pointer = (void*)file;
stream->size = resource->file_size;
/* it's a disk-based resource, we don't need to use the "base" and */
/* "cursor" fields of the stream objects */
stream->base = NULL;
stream->cursor = NULL;
PTRACE1(( "Os2File_Open: Opened `%s' (%d bytes) successfully\n",
resource->pathname, resource->file_size ));
return FT_Err_Ok;
}
/*************************************************************************/
/* */
/* <Function> */
/* Os2File_Close */
/* */
/* <Description> */
/* Closes a given stream. */
/* */
/* <Input> */
/* stream :: The target stream object. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
static
FT_Error Os2File_Close( FT_Stream stream )
{
PTRACE1(( "OS2File_Close: Closing file `%s'\n", STREAM_Name( stream ) ));
DosClose( STREAM_File( stream ) );
stream->resource = NULL;
stream->stream_id.pointer = NULL;
stream->size = 0;
return FT_Err_Ok;
}
/*************************************************************************/
/* */
/* <Function> */
/* Os2File_Seek */
/* */
/* <Description> */
/* Seeks a stream to a given position. */
/* */
/* <Input> */
/* stream :: The target stream object. */
/* position :: The offset in bytes from the start of the */
/* resource/stream. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
/* <Note> */
/* The `seek' method is never called by the stream manager in case */
/* of a memory-based resource (i.e., when `stream->base' isn't NULL). */
/* */
static
FT_Error Os2File_Seek( FT_Stream stream,
FT_Long position )
{
ULONG ibActual;
if ( DosSetFilePtr( STREAM_File( stream ), position,
FILE_BEGIN, &ibActual ) )
{
PERROR(( "Os2File_Seek: FAILED! Pos. %ld of `%s'\n",
position, STREAM_Name( stream ) ));
return FT_Err_Invalid_Stream_Seek;
}
PTRACE2(( "Os2File_Seek: Pos. %ld of `%s'\n",
position, STREAM_Name( stream ) ));
return FT_Err_Ok;
}
/*************************************************************************/
/* */
/* <Function> */
/* Os2File_Skip */
/* */
/* <Description> */
/* Skips a given number of bytes in an OS/2 stream. Useful to skip */
/* pad bytes, for example. */
/* */
/* <Input> */
/* stream :: The target stream object. */
/* count :: The number of bytes to skip in the stream. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
/* <Note> */
/* The `skip' method is never called by the stream manager in case */
/* of a memory-based resource (i.e., when `stream->base' isn't NULL). */
/* */
static
FT_Error Os2File_Skip( FT_Stream stream,
FT_Long count )
{
ULONG ibActual;
DosSetFilePtr( STREAM_File( stream ), 0, FILE_CURRENT, &ibActual );
return Os2File_Seek( stream, ibActual + count );
}
/*************************************************************************/
/* */
/* <Function> */
/* Os2File_Pos */
/* */
/* <Description> */
/* Returns the current offset within an OS/2 stream's resource. */
/* */
/* <Input> */
/* stream :: The target stream object. */
/* */
/* <Output> */
/* position :: The current offset. -1 in case of error. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
/* <Note> */
/* The `pos' method is never called by the stream manager in case */
/* of a memory-based resource (i.e., when `stream->base' isn't NULL). */
/* */
static
FT_Error Os2File_Pos( FT_Stream stream,
FT_Long* position )
{
ULONG ibActual;
if ( DosSetFilePtr( STREAM_File( stream ), 0, FILE_CURRENT, &ibActual ) )
{
PTRACE2(( "Os2File_Pos: FAILED! in `%s'\n", STREAM_Name( stream ) ));
return FT_Err_Invalid_Stream_Seek;
}
*position = ibActual;
PTRACE2(( "Os2File_Pos: For `%s'\n", STREAM_Name( stream ) ));
return FT_Err_Ok;
}
/*************************************************************************/
/* */
/* <Function> */
/* Os2File_Read */
/* */
/* <Description> */
/* Reads a given number of bytes from an OS/2 stream into memory. */
/* */
/* <Input> */
/* stream :: The target stream object. */
/* buffer :: The target read buffer where data is copied. */
/* size :: The number of bytes to read from the stream. */
/* */
/* <Output> */
/* read_bytes :: The number of bytes effectively read from the */
/* stream. Used in case of error */
/* (i.e. FT_Err_Invalid_Stream_Read) by some parts of */
/* the library. */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
/* <Note> */
/* It MUST return the error FT_Err_Invalid_Stream_Read in case of */
/* an over-read (i.e., reading more bytes from the stream that what */
/* is left), as the stream component checks for this specific value. */
/* */
/* The `read' method is never called by the stream manager in case */
/* of a memory-based resource (i.e., when `stream->base' isn't NULL). */
/* */
static
FT_Error Os2File_Read( FT_Stream stream,
char* buffer,
FT_Long size,
FT_Long* read_bytes )
{
ULONG cbActual;
DosRead( STREAM_File( stream ), buffer, size, &cbActual );
*read_bytes = cbActual;
if ( cbActual != (ULONG)size )
{
/* Note : we can have an over-read here when called by the */
/* function FT_Access_Compressed_Frame. This means */
/* that the following message should be a trace, */
/* rather than an error for disk-based resources.. */
/* */
/* the function must set the value of 'read_bytes' */
/* even if it returns an error code.. */
PTRACE2(( "Os2File_Read: FAILED! Read %ld bytes from '%s'\n",
size, STREAM_Name( stream ) ));
return FT_Err_Invalid_Stream_Read;
}
PTRACE2(( "Os2File_Read: Read %ld bytes to buffer 0x%08lx from `%s'\n",
size, (long)buffer, STREAM_Name( stream ) ));
return FT_Err_Ok;
}
/*************************************************************************/
/* */
/* The following table is the `virtual method table' for the `OS/2 */
/* resource class', which methods are defined above. Its address is set */
/* in the `interface' field of all resource objects created by the */
/* function FT_Create_Os2File() (see below). */
/* */
static
FTRes_InterfaceRec FT_Os2File_Interface =
{
(FTRes_Open_Func) Os2File_Open,
(FTRes_Close_Func) Os2File_Close,
(FTRes_Seek_Func) Os2File_Seek,
(FTRes_Skip_Func) Os2File_Skip,
(FTRes_Pos_Func) Os2File_Pos,
(FTRes_Read_Func) Os2File_Read,
};
/*************************************************************************/
/* */
/* <Function> */
/* FT_Create_Resource */
/* */
/* <Description> */
/* Creates a new resource object. This function is called by the */
/* FT_New_Resource() function of the base layer. */
/* */
/* <Input> */
/* library :: The input library object. */
/* pathname :: The file's pathname as an ASCII string. */
/* */
/* <Output> */
/* aresource :: A handle to new resource object. */
/* */
/* <Return> */
/* Error code. 0 means success. */
/* */
/* <Note> */
/* This functions does not open a stream. It simply copies the */
/* pathname within a fresh new resource object. */
/* */
EXPORT_FUNC
FT_Error FT_Create_Resource( FT_Library library,
const char* pathname,
FT_Resource* aresource )
{
FT_Int len;
FT_Os2File resource;
FT_Error error;
FT_System system;
if ( !library )
return FT_Err_Invalid_Library_Handle;
system = library->system;
if ( !pathname )
goto Fail_Null;
len = strlen( pathname );
if ( len == 0 )
goto Fail_Null;
resource = NULL;
if ( ALLOC( resource, sizeof ( *resource ) ) ||
ALLOC( resource->pathname, len + 1 ) )
goto Fail_Memory;
resource->root.library = library;
resource->root.interface = &FT_Os2File_Interface;
resource->root.flags = FT_RESOURCE_TYPE_DISK_BASED;
resource->file_size = -1;
strcpy( resource->pathname, pathname );
PTRACE1(( "Create_Os2File: OS/2 resource created for '%s'\n",
pathname ));
*aresource = (FT_Resource)resource;
return FT_Err_Ok;
Fail_Null:
PERROR(( "Create_Os2File: Null pathname!\n" ));
return FT_Err_Invalid_Argument;
Fail_Memory:
if ( resource )
FREE( resource->pathname );
FREE( resource );
PERROR(( "Create_Os2File: Not enough memory to create resource!\n" ));
return error;
}
/*************************************************************************/
/* */
/* <Function> */
/* FT_Destroy_Resource */
/* */
/* <Description> */
/* Discards a given resource object explicitly. */
/* */
/* <Input> */
/* resource :: The OS/2 resource object. */
/* */
/* <Note> */
/* This function does not check whether runs or streams are opened */
/* for the resource (for now, we assume developer intelligence. */
/* We'll most probably lower our standard later to ease debugging :-) */
/* */
EXPORT_FUNC
FT_Error FT_Destroy_Resource( FT_Resource resource )
{
FT_System system = resource->library->system;
FT_Os2File ansi = (FT_Os2File)resource;
if ( !ansi || ansi->root.interface != &FT_Os2File_Interface )
{
PERROR((
"Destroy_Os2File: Trying to destroy an invalid resource!\n" ));
return FT_Err_Invalid_Resource_Handle;
}
PTRACE1(( "Destroy_Os2File: Destroying resource for `%s'\n",
ansi->pathname ));
FREE( ansi->pathname );
FREE( ansi );
return FT_Err_Ok;
}
/*************************************************************************/
/* */
/* MEMORY MANAGEMENT */
/* */
/* */
/* This part copies the old FreeType 1.0 and 1.1 memory management */
/* scheme that was defined in the file `ttmemory.h'. One can see that */
/* */
/* - a set of macros is defined for the memory operations used by the */
/* engine (MEM_Copy(), MEM_Move(), MEM_Set()). This comes from the */
/* fact that many compilers are able to inline these operations */
/* directly within the compiled code, rather than generating a call */
/* to the C library. However, this obliges us to include the */
/* `<string.h>' header file. */
/* */
/* If you provide your own memory operations, you can get rid of the */
/* `#include <string.h>' below. */
/* */
/* */
/* - the FT_Alloc() function has several essential properties that MUST */
/* be retained by each port: */
/* */
/* - It returns an error code, NOT the allocated block's base */
/* address. */
/* */
/* - It takes the address of a target pointer, where the block's base */
/* address will be set. If the size is zero, its value will be */
/* NULL, and the function returns successfully. */
/* */
/* - In case of error, the pointer's value is set to NULL and an */
/* error code is returned. */
/* */
/* - The new allocated block MUST be zero-filled. This is a strong */
/* convention the rest of the engine relies on. */
/* */
/* */
/* - the FT_Free() function has also its essentials: */
/* */
/* - It takes the address of a pointer which value is the block's */
/* base address. This is UNLIKE a standard `free()' which takes */
/* the block's base directly. */
/* */
/* - It accepts successfully the address of a pointer which value is */
/* NULL, in which case it simply returns. */
/* */
/* - The pointer is always set to NULL by the function. */
/* */
/* */
/* - The MEM_Alloc(), ALLOC(), and ALLOC_ARRAY() macros are used by the */
/* library and should NOT be modified by porters! */
/* */
/*************************************************************************/
/*************************************************************************/
/* */
/* The macro FT_COMPONENT is used in trace mode. It is an implicit */
/* parameter of the PTRACE() and PERROR() macros, used to print/log */
/* messages during execution. */
/* */
#undef FT_COMPONENT
#define FT_COMPONENT trace_memory
/*************************************************************************/
/* */
/* <Function> */
/* FT_Alloc */
/* */
/* <Description> */
/* Allocates a new block of memory. The returned area is always */
/* zero-filled, this is a strong convention in many FreeType parts. */
/* */
/* <Input> */
/* system :: A handle to a given `system object' where allocation */
/* occurs. */
/* */
/* size :: The size in bytes of the block to allocate. */
/* */
/* <Output> */
/* P :: A pointer to the fresh new block. It should be set to */
/* NULL if `size' is 0, or in case of error. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
BASE_FUNC
FT_Error FT_Alloc( FT_System system,
FT_Long size,
void** P )
{
if ( !P )
{
PERROR(( "FT_Alloc: Invalid pointer address!\n" ));
return FT_Err_Invalid_Argument;
}
if ( size > 0 )
{
*P = malloc( size );
if ( !*P )
{
PERROR(( "FT_Alloc: Out of memory (%ld bytes requested)!\n",
size ));
return FT_Err_Out_Of_Memory;
}
system->total_alloc += size;
/* ALWAYS ZERO-FILL THE BLOCK! */
MEM_Set( *P, 0, size );
}
else
*P = NULL;
PTRACE2(( "FT_Alloc: Size = %ld, pointer = 0x%08lx, block = 0x%08lx\n",
size, (long)P, (long)*P ));
return FT_Err_Ok;
}
/*************************************************************************/
/* */
/* <Function> */
/* FT_Realloc */
/* */
/* <Description> */
/* Reallocates a block of memory pointed to by `*P' to `Size' bytes */
/* from the heap, possibly changing `*P'. */
/* */
/* <Input> */
/* system :: A handle to a given `system object' where allocation */
/* occurs. */
/* */
/* size :: The size in bytes of the block to allocate. */
/* */
/* <InOut> */
/* P :: A pointer to the fresh new block. It should be set to */
/* NULL if `size' is 0, or in case of error. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
BASE_FUNC
FT_Error FT_Realloc( FT_System system,
FT_Long size,
void** P )
{
void* Q;
if ( !P )
{
PERROR(( "FT_Realloc: Invalid pointer address!\n" ));
return FT_Err_Invalid_Argument;
}
/* if the original pointer is NULL, call FT_Alloc() */
if ( !*P )
return FT_Alloc( system, size, P );
/* if the new block if zero-sized, clear the current one */
if ( size <= 0 )
return FT_Free( system, P );
Q = (void*)realloc( *P, size );
if ( !Q )
{
PERROR(( "FT_Realloc: Reallocation failed!\n" ));
return FT_Err_Out_Of_Memory;
}
*P = Q;
return FT_Err_Ok;
}
/*************************************************************************/
/* */
/* <Function> */
/* FT_Free */
/* */
/* <Description> */
/* Releases a given block of memory allocated through FT_Alloc(). */
/* */
/* <Input> */
/* system :: A handle to a given `system object' where allocation */
/* occured. */
/* */
/* P :: This is the _address_ of a _pointer_ which points to the */
/* allocated block. It is always set to NULL on exit. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
/* <Note> */
/* If P or *P are NULL, this function should return successfully. */
/* This is a strong convention within all of FreeType and its */
/* drivers. */
/* */
BASE_FUNC
FT_Error FT_Free( FT_System system,
void* *P )
{
UNUSED( system );
PTRACE2(( "FT_Free: Freeing pointer 0x%08lx (block 0x%08lx)\n",
(long)P, (P ? (long)*P : -1) ));
if ( !P || !*P )
return FT_Err_Ok;
free( *P );
*P = NULL;
return FT_Err_Ok;
}
/*************************************************************************/
/* */
/* SYNCHRONIZATION MANAGEMENT */
/* */
/* */
/* This section deals with mutexes. The library can be compiled to */
/* two distinct thread support levels (namely single threaded and */
/* re-entrant modes). */
/* */
/* It protects its variables through the MUTEX_Lock() and */
/* MUTEX_Release() macros which are void in single threaded mode. */
/* */
/* It defines a typeless mutex reference type, `FT_Mutex', that you're */
/* free to redefine for your system's needs. */
/* */
/* The default implementation of ftsys.c contains only dummy functions */
/* which always return successfully. You NEED to specialize them in */
/* order to port ftsys.c to any multi-threaded environment. */
/* */
/*************************************************************************/
/*************************************************************************/
/* */
/* The macro FT_COMPONENT is used in trace mode. It is an implicit */
/* parameter of the PTRACE() and PERROR() macros, used to print/log */
/* messages during execution. */
/* */
#undef FT_COMPONENT
#define FT_COMPONENT trace_sync
#ifdef FT_CONFIG_THREADS
BASE_FUNC
FT_Error FT_Mutex_Create( FT_System system,
TMutex* mutex )
{
UNUSED( system );
mutex = (void*)-1;
system->num_mutexes++;
/* Insert your own mutex creation code here */
return FT_Err_Ok;
}
BASE_FUNC
void FT_Mutex_Delete( FT_System system,
TMutex* mutex )
{
UNUSED( system );
mutex = (void*)0;
system->num_mutexes--;
/* Insert your own mutex destruction code here */
}
BASE_FUNC
void FT_Mutex_Lock( FT_System system,
TMutex* mutex )
{
/* NOTE: It is legal to call this function with a NULL argument */
/* in which case an immediate return is appropriate. */
UNUSED( system );
if ( !mutex )
return;
/* Insert your own mutex locking code here */
}
BASE_FUNC
void FT_Mutex_Release( FT_System system,
TMutex* mutex )
{
/* NOTE: It is legal to call this function with a NULL argument */
/* in which case an immediate return is appropriate */
UNUSED( system );
if ( !mutex )
return;
/* Insert your own mutex release code here */
}
#endif /* FT_CONFIG_THREADS */
/*************************************************************************/
/* */
/* <Function> */
/* FT_New_System */
/* */
/* <Description> */
/* This function is used to create and initialize new system objects. */
/* These are mainly used to let client applications and font servers */
/* specify their own memory allocators and synchronization */
/* procedures. */
/* */
/* <Output> */
/* system :: A handle to a given `system object'. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
EXPORT_FUNC
FT_Error FT_New_System( FT_System* system )
{
*system = (FT_System)malloc( sizeof ( **system ) );
if ( !*system )
return FT_Err_Out_Of_Memory;
/* initialize memory management */
(*system)->system_flags = FT_SYSTEM_FLAG_TOTAL_ALLOC |
FT_SYSTEM_FLAG_MUTEXES;
(*system)->total_alloc = 0;
(*system)->num_mutexes = 0;
/* initialize i/o management (nothing) */
/* initialize synchronisation (nothing) */
/* initialize streams (nothing) */
return FT_Err_Ok;
}
/*************************************************************************/
/* */
/* <Function> */
/* FT_Done_System */
/* */
/* <Description> */
/* Destroys a given FreeType system object. */
/* */
/* <Input> */
/* system :: A handle to a given `system object'. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
EXPORT_FUNC
FT_Error FT_Done_System( FT_System system )
{
/* finalize synchronization (nothing) */
/* finalize i/o management (nothing) */
/* finalize memory management */
free( system );
return FT_Err_Ok;
}
/* END */