ftstream.h

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/***************************************************************************/
/*                                                                         */
/*  ftstream.h                                                             */
/*                                                                         */
/*    Stream handling (specification).                                     */
/*                                                                         */
/*  Copyright 1996-2001, 2002, 2004, 2005, 2006 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 <ft2build.h>
#include FT_SYSTEM_H
#include FT_INTERNAL_OBJECTS_H


FT_BEGIN_HEADER


  /* format of an 8-bit frame_op value:           */
  /*                                              */
  /* bit  76543210                                */
  /*      xxxxxxes                                */
  /*                                              */
  /* s is set to 1 if the value is signed.        */
  /* e is set to 1 if the value is little-endian. */
  /* xxx 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_long_be   = FT_MAKE_FRAME_OP( FT_FRAME_OP_LONG, 0, 1 ),
    ft_frame_ulong_le  = 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_off3_be   = FT_MAKE_FRAME_OP( FT_FRAME_OP_OFF3, 0, 1 ),
    ft_frame_uoff3_le  = 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_Byte    value;
    FT_Byte    size;
    FT_UShort  offset;

  } FT_Frame_Field;


  /* Construct an FT_Frame_Field out of a structure type and a field name. */
  /* The structure type must be set in the FT_STRUCTURE macro before       */
  /* calling the FT_FRAME_START() macro.                                   */
  /*                                                                       */
#define FT_FIELD_SIZE( f ) \
          (FT_Byte)sizeof ( ((FT_STRUCTURE*)0)->f )

#define FT_FIELD_SIZE_DELTA( f ) \
          (FT_Byte)sizeof ( ((FT_STRUCTURE*)0)->f[0] )

#define FT_FIELD_OFFSET( f ) \
          (FT_UShort)( offsetof( FT_STRUCTURE, f ) )

#define FT_FRAME_FIELD( frame_op, field ) \
          {                               \
            frame_op,                     \
            FT_FIELD_SIZE( field ),       \
            FT_FIELD_OFFSET( field )      \
          }

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

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

#define FT_FRAME_LONG( f )       FT_FRAME_FIELD( ft_frame_long_be, f )
#define FT_FRAME_ULONG( f )      FT_FRAME_FIELD( ft_frame_ulong_be, f )
#define FT_FRAME_SHORT( f )      FT_FRAME_FIELD( ft_frame_short_be, f )
#define FT_FRAME_USHORT( f )     FT_FRAME_FIELD( ft_frame_ushort_be, f )
#define FT_FRAME_OFF3( f )       FT_FRAME_FIELD( ft_frame_off3_be, f )
#define FT_FRAME_UOFF3( f )      FT_FRAME_FIELD( ft_frame_uoff3_be, f )
#define FT_FRAME_BYTE( f )       FT_FRAME_FIELD( ft_frame_byte, f )
#define FT_FRAME_CHAR( f )       FT_FRAME_FIELD( ft_frame_schar, f )

#define FT_FRAME_LONG_LE( f )    FT_FRAME_FIELD( ft_frame_long_le, f )
#define FT_FRAME_ULONG_LE( f )   FT_FRAME_FIELD( ft_frame_ulong_le, f )
#define FT_FRAME_SHORT_LE( f )   FT_FRAME_FIELD( ft_frame_short_le, f )
#define FT_FRAME_USHORT_LE( f )  FT_FRAME_FIELD( ft_frame_ushort_le, f )
#define FT_FRAME_OFF3_LE( f )    FT_FRAME_FIELD( ft_frame_off3_le, f )
#define FT_FRAME_UOFF3_LE( f )   FT_FRAME_FIELD( ft_frame_uoff3_le, 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( field, count ) \
          {                            \
            ft_frame_bytes,            \
            count,                     \
            FT_FIELD_OFFSET( 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 FT_BYTE_( p, i )  ( ((const FT_Byte*)(p))[(i)] )
#define FT_INT8_( p, i )  ( ((const FT_Char*)(p))[(i)] )

#define FT_INT16( x )   ( (FT_Int16)(x)  )
#define FT_UINT16( x )  ( (FT_UInt16)(x) )
#define FT_INT32( x )   ( (FT_Int32)(x)  )
#define FT_UINT32( x )  ( (FT_UInt32)(x) )

#define FT_BYTE_I16( p, i, s )  ( FT_INT16(  FT_BYTE_( p, i ) ) << (s) )
#define FT_BYTE_U16( p, i, s )  ( FT_UINT16( FT_BYTE_( p, i ) ) << (s) )
#define FT_BYTE_I32( p, i, s )  ( FT_INT32(  FT_BYTE_( p, i ) ) << (s) )
#define FT_BYTE_U32( p, i, s )  ( FT_UINT32( FT_BYTE_( p, i ) ) << (s) )

#define FT_INT8_I16( p, i, s )  ( FT_INT16(  FT_INT8_( p, i ) ) << (s) )
#define FT_INT8_U16( p, i, s )  ( FT_UINT16( FT_INT8_( p, i ) ) << (s) )
#define FT_INT8_I32( p, i, s )  ( FT_INT32(  FT_INT8_( p, i ) ) << (s) )
#define FT_INT8_U32( p, i, s )  ( FT_UINT32( FT_INT8_( p, i ) ) << (s) )


#define FT_PEEK_SHORT( p )  FT_INT16( FT_INT8_I16( p, 0, 8) | \
                                      FT_BYTE_I16( p, 1, 0) )

#define FT_PEEK_USHORT( p )  FT_UINT16( FT_BYTE_U16( p, 0, 8 ) | \
                                        FT_BYTE_U16( p, 1, 0 ) )

#define FT_PEEK_LONG( p )  FT_INT32( FT_INT8_I32( p, 0, 24 ) | \
                                     FT_BYTE_I32( p, 1, 16 ) | \
                                     FT_BYTE_I32( p, 2,  8 ) | \
                                     FT_BYTE_I32( p, 3,  0 ) )

#define FT_PEEK_ULONG( p )  FT_UINT32( FT_BYTE_U32( p, 0, 24 ) | \
                                       FT_BYTE_U32( p, 1, 16 ) | \
                                       FT_BYTE_U32( p, 2,  8 ) | \
                                       FT_BYTE_U32( p, 3,  0 ) )

#define FT_PEEK_OFF3( p )  FT_INT32( FT_INT8_I32( p, 0, 16 ) | \
                                     FT_BYTE_I32( p, 1,  8 ) | \
                                     FT_BYTE_I32( p, 2,  0 ) )

#define FT_PEEK_UOFF3( p )  FT_UINT32( FT_BYTE_U32( p, 0, 16 ) | \
                                       FT_BYTE_U32( p, 1,  8 ) | \
                                       FT_BYTE_U32( p, 2,  0 ) )

#define FT_PEEK_SHORT_LE( p )  FT_INT16( FT_INT8_I16( p, 1, 8 ) | \
                                         FT_BYTE_I16( p, 0, 0 ) )

#define FT_PEEK_USHORT_LE( p )  FT_UINT16( FT_BYTE_U16( p, 1, 8 ) |  \
                                           FT_BYTE_U16( p, 0, 0 ) )

#define FT_PEEK_LONG_LE( p )  FT_INT32( FT_INT8_I32( p, 3, 24 ) | \
                                        FT_BYTE_I32( p, 2, 16 ) | \
                                        FT_BYTE_I32( p, 1,  8 ) | \
                                        FT_BYTE_I32( p, 0,  0 ) )

#define FT_PEEK_ULONG_LE( p )  FT_UINT32( FT_BYTE_U32( p, 3, 24 ) | \
                                          FT_BYTE_U32( p, 2, 16 ) | \
                                          FT_BYTE_U32( p, 1,  8 ) | \
                                          FT_BYTE_U32( p, 0,  0 ) )

#define FT_PEEK_OFF3_LE( p )  FT_INT32( FT_INT8_I32( p, 2, 16 ) | \
                                        FT_BYTE_I32( p, 1,  8 ) | \
                                        FT_BYTE_I32( p, 0,  0 ) )

#define FT_PEEK_UOFF3_LE( p )  FT_UINT32( FT_BYTE_U32( p, 2, 16 ) | \
                                          FT_BYTE_U32( p, 1,  8 ) | \
                                          FT_BYTE_U32( p, 0,  0 ) )


#define FT_NEXT_CHAR( buffer )       \
          ( (signed char)*buffer++ )

#define FT_NEXT_BYTE( buffer )         \
          ( (unsigned char)*buffer++ )

#define FT_NEXT_SHORT( buffer )                                   \
          ( (short)( buffer += 2, FT_PEEK_SHORT( buffer - 2 ) ) )

#define FT_NEXT_USHORT( buffer )                                            \
          ( (unsigned short)( buffer += 2, FT_PEEK_USHORT( buffer - 2 ) ) )

#define FT_NEXT_OFF3( buffer )                                  \
          ( (long)( buffer += 3, FT_PEEK_OFF3( buffer - 3 ) ) )

#define FT_NEXT_UOFF3( buffer )                                           \
          ( (unsigned long)( buffer += 3, FT_PEEK_UOFF3( buffer - 3 ) ) )

#define FT_NEXT_LONG( buffer )                                  \
          ( (long)( buffer += 4, FT_PEEK_LONG( buffer - 4 ) ) )

#define FT_NEXT_ULONG( buffer )                                           \
          ( (unsigned long)( buffer += 4, FT_PEEK_ULONG( buffer - 4 ) ) )


#define FT_NEXT_SHORT_LE( buffer )                                   \
          ( (short)( buffer += 2, FT_PEEK_SHORT_LE( buffer - 2 ) ) )

#define FT_NEXT_USHORT_LE( buffer )                                            \
          ( (unsigned short)( buffer += 2, FT_PEEK_USHORT_LE( buffer - 2 ) ) )

#define FT_NEXT_OFF3_LE( buffer )                                  \
          ( (long)( buffer += 3, FT_PEEK_OFF3_LE( buffer - 3 ) ) )

#define FT_NEXT_UOFF3_LE( buffer )                                           \
          ( (unsigned long)( buffer += 3, FT_PEEK_UOFF3_LE( buffer - 3 ) ) )

#define FT_NEXT_LONG_LE( buffer )                                  \
          ( (long)( buffer += 4, FT_PEEK_LONG_LE( buffer - 4 ) ) )

#define FT_NEXT_ULONG_LE( buffer )                                           \
          ( (unsigned long)( buffer += 4, FT_PEEK_ULONG_LE( buffer - 4 ) ) )


  /*************************************************************************/
  /*                                                                       */
  /* Each GET_xxxx() macro uses an implicit `stream' variable.             */