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|
/***************************************************************************/
/* */
/* ftsystem.c */
/* */
/* Amiga-specific FreeType low-level system interface (body). */
/* */
/* Copyright 1996-2001, 2002, 2005, 2006, 2007 by */
/* David Turner, Robert Wilhelm, Werner Lemberg and Detlef Würkner. */
/* */
/* 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 file contains the Amiga interface used by FreeType to access */
/* low-level, i.e. memory management, i/o access as well as thread */
/* synchronisation. */
/* */
/*************************************************************************/
/*************************************************************************/
/* */
/* Maintained by Detlef Würkner <TetiSoft@apg.lahn.de> */
/* */
/* Based on the original ftsystem.c, */
/* modified to avoid fopen(), fclose(), fread(), fseek(), ftell(), */
/* malloc(), realloc(), and free(). */
/* */
/* Those C library functions are often not thread-safe or cant be */
/* used in a shared Amiga library. If that's not a problem for you, */
/* you can of course use the default ftsystem.c with C library calls */
/* instead. */
/* */
/* This implementation needs exec V39+ because it uses AllocPooled() etc */
/* */
/*************************************************************************/
#define __NOLIBBASE__
#define __NOGLOBALIFACE__
#define __USE_INLINE__
#include <proto/exec.h>
#include <dos/stdio.h>
#include <proto/dos.h>
#ifdef __amigaos4__
extern struct ExecIFace *IExec;
extern struct DOSIFace *IDOS;
#else
extern struct Library *SysBase;
extern struct Library *DOSBase;
#endif
#define IOBUF_SIZE 512
/* structure that helps us to avoid
* useless calls of Seek() and Read()
*/
struct SysFile
{
BPTR file;
ULONG iobuf_start;
ULONG iobuf_end;
UBYTE iobuf[IOBUF_SIZE];
};
#ifndef __amigaos4__
/* C implementation of AllocVecPooled (see autodoc exec/AllocPooled) */
APTR
Alloc_VecPooled( APTR poolHeader,
ULONG memSize )
{
ULONG newSize = memSize + sizeof ( ULONG );
ULONG *mem = AllocPooled( poolHeader, newSize );
if ( !mem )
return NULL;
*mem = newSize;
return mem + 1;
}
/* C implementation of FreeVecPooled (see autodoc exec/AllocPooled) */
void
Free_VecPooled( APTR poolHeader,
APTR memory )
{
ULONG *realmem = (ULONG *)memory - 1;
FreePooled( poolHeader, realmem, *realmem );
}
#endif
#include <ft2build.h>
#include FT_CONFIG_CONFIG_H
#include FT_INTERNAL_DEBUG_H
#include FT_SYSTEM_H
#include FT_ERRORS_H
#include FT_TYPES_H
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
/*************************************************************************/
/* */
/* MEMORY MANAGEMENT INTERFACE */
/* */
/*************************************************************************/
/*************************************************************************/
/* */
/* It is not necessary to do any error checking for the */
/* allocation-related functions. This is 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 )
{
#ifdef __amigaos4__
return AllocVecPooled( memory->user, size );
#else
return Alloc_VecPooled( memory->user, size );
#endif
}
/*************************************************************************/
/* */
/* <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 )
{
void* new_block;
#ifdef __amigaos4__
new_block = AllocVecPooled ( memory->user, new_size );
#else
new_block = Alloc_VecPooled ( memory->user, new_size );
#endif
if ( new_block != NULL )
{
CopyMem ( block, new_block,
( new_size > cur_size ) ? cur_size : new_size );
#ifdef __amigaos4__
FreeVecPooled ( memory->user, block );
#else
Free_VecPooled ( memory->user, block );
#endif
}
return new_block;
}
/*************************************************************************/
/* */
/* <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 )
{
#ifdef __amigaos4__
FreeVecPooled( memory->user, block );
#else
Free_VecPooled( memory->user, block );
#endif
}
/*************************************************************************/
/* */
/* 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 trace_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 ) ( (struct SysFile *)stream->descriptor.pointer )
/*************************************************************************/
/* */
/* <Function> */
/* ft_amiga_stream_close */
/* */
/* <Description> */
/* The function to close a stream. */
/* */
/* <Input> */
/* stream :: A pointer to the stream object. */
/* */
FT_CALLBACK_DEF( void )
ft_amiga_stream_close( FT_Stream stream )
{
struct SysFile* sysfile;
sysfile = STREAM_FILE( stream );
Close ( sysfile->file );
FreeMem ( sysfile, sizeof ( struct SysFile ));
stream->descriptor.pointer = NULL;
stream->size = 0;
stream->base = 0;
}
/*************************************************************************/
/* */
/* <Function> */
/* ft_amiga_stream_io */
/* */
/* <Description> */
/* The function to open a stream. */
/* */
/* <Input> */
/* stream :: A pointer to the stream object. */
/* */
/* offset :: The position in the data stream to start reading. */
/* */
/* buffer :: The address of buffer to store the read data. */
/* */
/* count :: The number of bytes to read from the stream. */
/* */
/* <Return> */
/* The number of bytes actually read. */
/* */
FT_CALLBACK_DEF( unsigned long )
ft_amiga_stream_io( FT_Stream stream,
unsigned long offset,
unsigned char* buffer,
unsigned long count )
{
struct SysFile* sysfile;
unsigned long read_bytes;
if ( count != 0 )
{
sysfile = STREAM_FILE( stream );
/* handle the seek */
if ( (offset < sysfile->iobuf_start) || (offset + count > sysfile->iobuf_end) )
{
/* requested offset implies we need a buffer refill */
if ( !sysfile->iobuf_end || offset != sysfile->iobuf_end )
{
/* a physical seek is necessary */
Seek( sysfile->file, offset, OFFSET_BEGINNING );
}
sysfile->iobuf_start = offset;
sysfile->iobuf_end = 0; /* trigger a buffer refill */
}
/* handle the read */
if ( offset + count <= sysfile->iobuf_end )
{
/* we have buffer and requested bytes are all inside our buffer */
CopyMem( &sysfile->iobuf[offset - sysfile->iobuf_start], buffer, count );
read_bytes = count;
}
else
{
/* (re)fill buffer */
if ( count <= IOBUF_SIZE )
{
/* requested bytes is a subset of the buffer */
read_bytes = Read( sysfile->file, sysfile->iobuf, IOBUF_SIZE );
if ( read_bytes == -1UL )
{
/* error */
read_bytes = 0;
}
else
{
sysfile->iobuf_end = offset + read_bytes;
CopyMem( sysfile->iobuf, buffer, count );
if ( read_bytes > count )
{
read_bytes = count;
}
}
}
else
{
/* we actually need more than our buffer can hold, so we decide
** to do a single big read, and then copy the last IOBUF_SIZE
** bytes of that to our internal buffer for later use */
read_bytes = Read( sysfile->file, buffer, count );
if ( read_bytes == -1UL )
{
/* error */
read_bytes = 0;
}
else
{
ULONG bufsize;
bufsize = ( read_bytes > IOBUF_SIZE ) ? IOBUF_SIZE : read_bytes;
sysfile->iobuf_end = offset + read_bytes;
sysfile->iobuf_start = sysfile->iobuf_end - bufsize;
CopyMem( &buffer[read_bytes - bufsize] , sysfile->iobuf, bufsize );
}
}
}
}
else
{
read_bytes = 0;
}
return read_bytes;
}
/* documentation is in ftobjs.h */
FT_BASE_DEF( FT_Error )
FT_Stream_Open( FT_Stream stream,
const char* filepathname )
{
struct FileInfoBlock* fib;
struct SysFile* sysfile;
if ( !stream )
return FT_Err_Invalid_Stream_Handle;
#ifdef __amigaos4__
sysfile = AllocMem ( sizeof (struct SysFile ), MEMF_SHARED );
#else
sysfile = AllocMem ( sizeof (struct SysFile ), MEMF_PUBLIC );
#endif
if ( !sysfile )
{
FT_ERROR(( "FT_Stream_Open:" ));
FT_ERROR(( " could not open `%s'\n", filepathname ));
return FT_Err_Cannot_Open_Resource;
}
sysfile->file = Open( (STRPTR)filepathname, MODE_OLDFILE );
if ( !sysfile->file )
{
FreeMem ( sysfile, sizeof ( struct SysFile ));
FT_ERROR(( "FT_Stream_Open:" ));
FT_ERROR(( " could not open `%s'\n", filepathname ));
return FT_Err_Cannot_Open_Resource;
}
fib = AllocDosObject( DOS_FIB, NULL );
if ( !fib )
{
Close ( sysfile->file );
FreeMem ( sysfile, sizeof ( struct SysFile ));
FT_ERROR(( "FT_Stream_Open:" ));
FT_ERROR(( " could not open `%s'\n", filepathname ));
return FT_Err_Cannot_Open_Resource;
}
if ( !( ExamineFH( sysfile->file, fib ) ) )
{
FreeDosObject( DOS_FIB, fib );
Close ( sysfile->file );
FreeMem ( sysfile, sizeof ( struct SysFile ));
FT_ERROR(( "FT_Stream_Open:" ));
FT_ERROR(( " could not open `%s'\n", filepathname ));
return FT_Err_Cannot_Open_Resource;
}
stream->size = fib->fib_Size;
FreeDosObject( DOS_FIB, fib );
stream->descriptor.pointer = (void *)sysfile;
stream->pathname.pointer = (char*)filepathname;
sysfile->iobuf_start = 0;
sysfile->iobuf_end = 0;
stream->pos = 0;
stream->read = ft_amiga_stream_io;
stream->close = ft_amiga_stream_close;
FT_TRACE1(( "FT_Stream_Open:" ));
FT_TRACE1(( " opened `%s' (%ld bytes) successfully\n",
filepathname, stream->size ));
return FT_Err_Ok;
}
#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;
#ifdef __amigaos4__
memory = (FT_Memory)AllocVec( sizeof ( *memory ), MEMF_SHARED );
#else
memory = (FT_Memory)AllocVec( sizeof ( *memory ), MEMF_PUBLIC );
#endif
if ( memory )
{
#ifdef __amigaos4__
memory->user = CreatePool( MEMF_SHARED, 16384, 16384 );
#else
memory->user = CreatePool( MEMF_PUBLIC, 16384, 16384 );
#endif
if ( memory->user == NULL )
{
FreeVec( memory );
memory = NULL;
}
else
{
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
DeletePool( memory->user );
FreeVec( memory );
}
/*
Local Variables:
coding: latin-1
End:
*/
/* END */
|
