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/***************************************************************************/
/* */
/* ftstream.h */
/* */
/* Stream handling(specification). */
/* */
/* Copyright 1996-2000 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. */
/* */
/***************************************************************************/


#ifndef FTSTREAM_H
#define FTSTREAM_H

#include "ftobjs.h"


#ifdef __cplusplus
extern "C" {
#endif


/* format of an 8-bit frame_op value = [ xxxxx | e | s ] */
/* s is set to 1 if the value is signed, */
/* e is set to 1 if the value is little-endian */
/* xxxxx is a command */

#define FT_FRAME_OP_SHIFT 2
#define FT_FRAME_OP_SIGNED 1
#define FT_FRAME_OP_LITTLE 2
#define FT_FRAME_OP_COMMAND( x ) ( x >> FT_FRAME_OP_SHIFT )

#define FT_MAKE_FRAME_OP( command, little, sign ) \
( ( command << FT_FRAME_OP_SHIFT ) | ( little << 1 ) | sign )

#define FT_FRAME_OP_END 0
#define FT_FRAME_OP_START 1 /* start a new frame */
#define FT_FRAME_OP_BYTE 2 /* read 1-byte value */
#define FT_FRAME_OP_SHORT 3 /* read 2-byte value */
#define FT_FRAME_OP_LONG 4 /* read 4-byte value */
#define FT_FRAME_OP_OFF3 5 /* read 3-byte value */
#define FT_FRAME_OP_BYTES 6 /* read a bytes sequence */


typedef enum FT_Frame_Op_
{
ft_frame_end = 0,
ft_frame_start = FT_MAKE_FRAME_OP( FT_FRAME_OP_START, 0, 0 ),

ft_frame_byte = FT_MAKE_FRAME_OP( FT_FRAME_OP_BYTE, 0, 0 ),
ft_frame_schar = FT_MAKE_FRAME_OP( FT_FRAME_OP_BYTE, 0, 1 ),

ft_frame_ushort_be = FT_MAKE_FRAME_OP( FT_FRAME_OP_SHORT, 0, 0 ),
ft_frame_short_be = FT_MAKE_FRAME_OP( FT_FRAME_OP_SHORT, 0, 1 ),
ft_frame_ushort_le = FT_MAKE_FRAME_OP( FT_FRAME_OP_SHORT, 1, 0 ),
ft_frame_short_le = FT_MAKE_FRAME_OP( FT_FRAME_OP_SHORT, 1, 1 ),

ft_frame_ulong_be = FT_MAKE_FRAME_OP( FT_FRAME_OP_LONG, 0, 0 ),
ft_frame_ulong_le = FT_MAKE_FRAME_OP( FT_FRAME_OP_LONG, 0, 1 ),
ft_frame_long_be = FT_MAKE_FRAME_OP( FT_FRAME_OP_LONG, 1, 0 ),
ft_frame_long_le = FT_MAKE_FRAME_OP( FT_FRAME_OP_LONG, 1, 1 ),

ft_frame_uoff3_be = FT_MAKE_FRAME_OP( FT_FRAME_OP_OFF3, 0, 0 ),
ft_frame_uoff3_le = FT_MAKE_FRAME_OP( FT_FRAME_OP_OFF3, 0, 1 ),
ft_frame_off3_be = FT_MAKE_FRAME_OP( FT_FRAME_OP_OFF3, 1, 0 ),
ft_frame_off3_le = FT_MAKE_FRAME_OP( FT_FRAME_OP_OFF3, 1, 1 ),

ft_frame_bytes = FT_MAKE_FRAME_OP( FT_FRAME_OP_BYTES, 0, 0 ),
ft_frame_skip = FT_MAKE_FRAME_OP( FT_FRAME_OP_BYTES, 0, 1 )

} FT_Frame_Op;


typedef struct FT_Frame_Field_
{
FT_Frame_Op value;
char size;
FT_UShort offset;

} FT_Frame_Field;


/* make-up a FT_Frame_Field out of a structure type and a field name */
#define FT_FIELD_REF( s, f ) ( ( (s*)0 )->f )

#define FT_FRAME_FIELD( frame_op, struct_type, field ) \
{ \
frame_op, \
sizeof( FT_FIELD_REF( struct_type,field ) ), \
(FT_UShort)(char*)&FT_FIELD_REF( struct_type, field ) \
}

#define FT_MAKE_EMPTY_FIELD( frame_op ) { frame_op, 0, 0 }

#define FT_FRAME_START( s ) { ft_frame_start, 0, s }
#define FT_FRAME_END { ft_frame_end, 0, 0 }

#define FT_FRAME_LONG( s, f ) FT_FRAME_FIELD( ft_frame_long_be, s, f )
#define FT_FRAME_ULONG( s, f ) FT_FRAME_FIELD( ft_frame_ulong_be, s, f )
#define FT_FRAME_SHORT( s, f ) FT_FRAME_FIELD( ft_frame_short_be, s, f )
#define FT_FRAME_USHORT( s, f ) FT_FRAME_FIELD( ft_frame_ushort_be, s, f )
#define FT_FRAME_BYTE( s, f ) FT_FRAME_FIELD( ft_frame_byte, s, f )
#define FT_FRAME_CHAR( s, f ) FT_FRAME_FIELD( ft_frame_schar, s, f )

#define FT_FRAME_LONG_LE( s, f ) FT_FRAME_FIELD( ft_frame_long_le, s, f )
#define FT_FRAME_ULONG_LE( s, f ) FT_FRAME_FIELD( ft_frame_ulong_le, s, f )
#define FT_FRAME_SHORT_LE( s, f ) FT_FRAME_FIELD( ft_frame_short_le, s, f )
#define FT_FRAME_USHORT_LE( s, f ) FT_FRAME_FIELD( ft_frame_ushort_le, s, f )

#define FT_FRAME_SKIP_LONG { ft_frame_long_be, 0, 0 }
#define FT_FRAME_SKIP_SHORT { ft_frame_short_be, 0, 0 }
#define FT_FRAME_SKIP_BYTE { ft_frame_byte, 0, 0 }

#define FT_FRAME_BYTES( struct_type, field, count ) \
{ \
ft_frame_bytes, \
count, \
(FT_UShort)(char*)&FT_FIELD_REF( struct_type, field ) \
}
#define FT_FRAME_SKIP_BYTES( count ) { ft_frame_skip, count, 0 }



/*************************************************************************/
/* */
/* integer extraction macros -- the `buffer' parameter must ALWAYS be of */
/* type `char*' or equivalent (1-byte elements). */
/* */
#define NEXT_Char( buffer ) \
( (signed char)*buffer++ )
#define NEXT_Byte( buffer ) \
( (unsigned char)*buffer++ )

#define NEXT_Short( buffer ) \
( buffer += 2, \
( (short)( (signed char)buffer[-2] << 8 ) | \
(unsigned char)buffer[-1] ) )

#define NEXT_UShort( buffer ) \
( (unsigned short)NEXT_Short( buffer ) )

#define NEXT_Offset( buffer ) \
( buffer += 3, \
( ( (long)(signed char)buffer[-3] << 16 ) | \
( (long)(unsigned char)buffer[-2] << 8 ) | \
(long)(unsigned char)buffer[-1] ) )

#define NEXT_UOffset( buffer ) \
( (unsigned long)NEXT_Offset( buffer ) )

#define NEXT_Long( buffer ) \
( buffer += 4, \
( ( (long)(signed char)buffer[-4] << 24 ) | \
( (long)(unsigned char)buffer[-3] << 16 ) | \
( (long)(unsigned char)buffer[-2] << 8 ) | \
(long)(unsigned char)buffer[-1] ) )

#define NEXT_ULong( buffer ) \
( (unsigned long)NEXT_Long( buffer ) )


#define NEXT_ShortLE( buffer ) \
( buffer += 2, \
( (short)( (signed char)buffer[-1] << 8 ) | \
(unsigned char)buffer[-2] ) )

#define NEXT_UShortLE( buffer ) \
( (unsigned short)NEXT_ShortLE( buffer ) )

#define NEXT_OffsetLE( buffer ) \
( buffer += 3, \
( ( (long)(signed char)buffer[-1] << 16 ) | \
( (long)(unsigned char)buffer[-2] << 8 ) | \
(long)(unsigned char)buffer[-3] ) )

#define NEXT_UOffsetLE( buffer ) \
( (unsigned long)NEXT_OffsetLE( buffer ) )


#define NEXT_LongLE( buffer ) \
( buffer += 4, \
( ( (long)(signed char)buffer[-1] << 24 ) | \
( (long)(unsigned char)buffer[-2] << 16 ) | \
( (long)(unsigned char)buffer[-3] << 8 ) | \
(long)(unsigned char)buffer[-4] ) )

#define NEXT_ULongLE( buffer ) \
( (unsigned long)NEXT_LongLE( buffer ) )


/*************************************************************************/
/* */
/* Each GET_xxxx() macro uses an implicit `stream' variable. */
/* */
#define FT_GET_MACRO( func, type ) ( (type)func( stream ) )

#define GET_Char() FT_GET_MACRO( FT_Get_Char, FT_Char )
#define GET_Byte() FT_GET_MACRO( FT_Get_Char, FT_Byte )
#define GET_Short() FT_GET_MACRO( FT_Get_Short, FT_Short )
#define GET_UShort() FT_GET_MACRO( FT_Get_Short, FT_UShort )
#define GET_Offset() FT_GET_MACRO( FT_Get_Offset, FT_Long )
#define GET_UOffset() FT_GET_MACRO( FT_Get_Offset, FT_ULong )
#define GET_Long() FT_GET_MACRO( FT_Get_Long, FT_Long )
#define GET_ULong() FT_GET_MACRO( FT_Get_Long, FT_ULong )
#define GET_Tag4() FT_GET_MACRO( FT_Get_Long, FT_ULong )

#define GET_ShortLE() FT_GET_MACRO( FT_Get_ShortLE, FT_Short )
#define GET_UShortLE() FT_GET_MACRO( FT_Get_ShortLE, FT_UShort )
#define GET_LongLE() FT_GET_MACRO( FT_Get_LongLE, FT_Short )
#define GET_ULongLE() FT_GET_MACRO( FT_Get_LongLE, FT_Short )

#define FT_READ_MACRO( func, type, var ) \
( var = (type)func( stream, &error ), \
error != FT_Err_Ok )

#define READ_Byte( var ) FT_READ_MACRO( FT_Read_Char, FT_Byte, var )
#define READ_Char( var ) FT_READ_MACRO( FT_Read_Char, FT_Char, var )
#define READ_Short( var ) FT_READ_MACRO( FT_Read_Short, FT_Short, var )
#define READ_UShort( var ) FT_READ_MACRO( FT_Read_Short, FT_UShort, var )
#define READ_Offset( var ) FT_READ_MACRO( FT_Read_Offset, FT_Long, var )
#define READ_UOffset( var ) FT_READ_MACRO( FT_Read_Offset, FT_ULong, var )
#define READ_Long( var ) FT_READ_MACRO( FT_Read_Long, FT_Long, var )
#define READ_ULong( var ) FT_READ_MACRO( FT_Read_Long, FT_ULong, var )

#define READ_ShortLE( var ) FT_READ_MACRO( FT_Read_ShortLE, FT_Short, var )
#define READ_UShortLE( var ) FT_READ_MACRO( FT_Read_ShortLE, FT_UShort, var )
#define READ_LongLE( var ) FT_READ_MACRO( FT_Read_LongLE, FT_Long, var )
#define READ_ULongLE( var ) FT_READ_MACRO( FT_Read_LongLE, FT_ULong, var )


BASE_DEF( void ) FT_New_Memory_Stream( FT_Library library,
FT_Byte * base,
FT_ULong size,
FT_Stream stream );

BASE_DEF( FT_Error ) FT_Seek_Stream( FT_Stream stream,
FT_ULong pos );

BASE_DEF( FT_Error ) FT_Skip_Stream( FT_Stream stream,
FT_Long distance );

BASE_DEF( FT_Long ) FT_Stream_Pos( FT_Stream stream );


BASE_DEF( FT_Error ) FT_Read_Stream( FT_Stream stream,
FT_Byte * buffer,
FT_ULong count );

BASE_DEF( FT_Error ) FT_Read_Stream_At( FT_Stream stream,
FT_ULong pos,
FT_Byte * buffer,
FT_ULong count );

BASE_DEF( FT_Error ) FT_Access_Frame( FT_Stream stream,
FT_ULong count );

BASE_DEF( void ) FT_Forget_Frame( FT_Stream stream );

BASE_DEF( FT_Error ) FT_Extract_Frame( FT_Stream stream,
FT_ULong count,
FT_Byte * *pbytes );

BASE_DEF( void ) FT_Release_Frame( FT_Stream stream,
FT_Byte * *pbytes );

BASE_DEF( FT_Char ) FT_Get_Char( FT_Stream stream );

BASE_DEF( FT_Short ) FT_Get_Short( FT_Stream stream );

BASE_DEF( FT_Long ) FT_Get_Offset( FT_Stream stream );

BASE_DEF( FT_Long ) FT_Get_Long( FT_Stream stream );

BASE_DEF( FT_Short ) FT_Get_ShortLE( FT_Stream stream );

BASE_DEF( FT_Long ) FT_Get_LongLE( FT_Stream stream );


BASE_DEF( FT_Char ) FT_Read_Char( FT_Stream stream,
FT_Error * error );

BASE_DEF( FT_Short ) FT_Read_Short( FT_Stream stream,
FT_Error * error );

BASE_DEF( FT_Long ) FT_Read_Offset( FT_Stream stream,
FT_Error * error );

BASE_DEF( FT_Long ) FT_Read_Long( FT_Stream stream,
FT_Error * error );

BASE_DEF( FT_Short ) FT_Read_ShortLE( FT_Stream stream,
FT_Error * error );

BASE_DEF( FT_Long ) FT_Read_LongLE( FT_Stream stream,
FT_Error * error );

BASE_DEF( FT_Error ) FT_Read_Fields( FT_Stream stream,
const FT_Frame_Field * fields,
void* structure );


#define USE_Stream( resource, stream ) \
FT_SET_ERROR( FT_Open_Stream( resource, stream ) )

#define DONE_Stream( stream ) \
FT_Done_Stream( stream )


#define ACCESS_Frame( size ) \
FT_SET_ERROR( FT_Access_Frame( stream, size ) )

#define FORGET_Frame() \
FT_Forget_Frame( stream )

#define EXTRACT_Frame( size, bytes ) \
FT_SET_ERROR( FT_Extract_Frame( stream, size, \
(FT_Byte**)&( bytes ) ) )

#define RELEASE_Frame( bytes ) \
FT_Release_Frame( stream, (FT_Byte**)&( bytes ) )

#define FILE_Seek( position ) \
FT_SET_ERROR( FT_Seek_Stream( stream, position ) )

#define FILE_Skip( distance ) \
FT_SET_ERROR( FT_Skip_Stream( stream, distance ) )

#define FILE_Pos() \
FT_Stream_Pos( stream )

#define FILE_Read( buffer, count ) \
FT_SET_ERROR( FT_Read_Stream( stream, \
(FT_Byte*)buffer, \
count ) )

#define FILE_Read_At( position, buffer, count ) \
FT_SET_ERROR( FT_Read_Stream_At( stream, \
position, \
(FT_Byte*)buffer, \
count ) )

#define READ_Fields( fields, object ) \
( ( error = FT_Read_Fields( stream, fields, object ) ) != FT_Err_Ok )


#ifdef __cplusplus
}
#endif


#endif /* FTSTREAM_H */


/* END */
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