forked from minhngoc25a/freetype2
499 lines
21 KiB
C
499 lines
21 KiB
C
/***************************************************************************/
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/* */
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/* ftstream.h */
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/* */
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/* Stream handling (specification). */
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/* */
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/* Copyright 1996-2001, 2002 by */
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/* David Turner, Robert Wilhelm, and Werner Lemberg. */
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/* */
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/* This file is part of the FreeType project, and may only be used, */
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/* modified, and distributed under the terms of the FreeType project */
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/* license, LICENSE.TXT. By continuing to use, modify, or distribute */
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/* this file you indicate that you have read the license and */
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/* understand and accept it fully. */
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/* */
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/***************************************************************************/
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#ifndef __FTSTREAM_H__
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#define __FTSTREAM_H__
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#include <ft2build.h>
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#include FT_SYSTEM_H
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#include FT_INTERNAL_OBJECTS_H
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FT_BEGIN_HEADER
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/* format of an 8-bit frame_op value: */
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/* */
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/* bit 76543210 */
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/* xxxxxxes */
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/* */
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/* s is set to 1 if the value is signed. */
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/* e is set to 1 if the value is little-endian. */
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/* xxx is a command. */
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#define FT_FRAME_OP_SHIFT 2
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#define FT_FRAME_OP_SIGNED 1
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#define FT_FRAME_OP_LITTLE 2
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#define FT_FRAME_OP_COMMAND( x ) ( x >> FT_FRAME_OP_SHIFT )
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#define FT_MAKE_FRAME_OP( command, little, sign ) \
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( ( command << FT_FRAME_OP_SHIFT ) | ( little << 1 ) | sign )
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#define FT_FRAME_OP_END 0
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#define FT_FRAME_OP_START 1 /* start a new frame */
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#define FT_FRAME_OP_BYTE 2 /* read 1-byte value */
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#define FT_FRAME_OP_SHORT 3 /* read 2-byte value */
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#define FT_FRAME_OP_LONG 4 /* read 4-byte value */
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#define FT_FRAME_OP_OFF3 5 /* read 3-byte value */
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#define FT_FRAME_OP_BYTES 6 /* read a bytes sequence */
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typedef enum FT_Frame_Op_
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{
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ft_frame_end = 0,
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ft_frame_start = FT_MAKE_FRAME_OP( FT_FRAME_OP_START, 0, 0 ),
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ft_frame_byte = FT_MAKE_FRAME_OP( FT_FRAME_OP_BYTE, 0, 0 ),
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ft_frame_schar = FT_MAKE_FRAME_OP( FT_FRAME_OP_BYTE, 0, 1 ),
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ft_frame_ushort_be = FT_MAKE_FRAME_OP( FT_FRAME_OP_SHORT, 0, 0 ),
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ft_frame_short_be = FT_MAKE_FRAME_OP( FT_FRAME_OP_SHORT, 0, 1 ),
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ft_frame_ushort_le = FT_MAKE_FRAME_OP( FT_FRAME_OP_SHORT, 1, 0 ),
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ft_frame_short_le = FT_MAKE_FRAME_OP( FT_FRAME_OP_SHORT, 1, 1 ),
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ft_frame_ulong_be = FT_MAKE_FRAME_OP( FT_FRAME_OP_LONG, 0, 0 ),
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ft_frame_long_be = FT_MAKE_FRAME_OP( FT_FRAME_OP_LONG, 0, 1 ),
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ft_frame_ulong_le = FT_MAKE_FRAME_OP( FT_FRAME_OP_LONG, 1, 0 ),
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ft_frame_long_le = FT_MAKE_FRAME_OP( FT_FRAME_OP_LONG, 1, 1 ),
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ft_frame_uoff3_be = FT_MAKE_FRAME_OP( FT_FRAME_OP_OFF3, 0, 0 ),
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ft_frame_off3_be = FT_MAKE_FRAME_OP( FT_FRAME_OP_OFF3, 0, 1 ),
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ft_frame_uoff3_le = FT_MAKE_FRAME_OP( FT_FRAME_OP_OFF3, 1, 0 ),
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ft_frame_off3_le = FT_MAKE_FRAME_OP( FT_FRAME_OP_OFF3, 1, 1 ),
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ft_frame_bytes = FT_MAKE_FRAME_OP( FT_FRAME_OP_BYTES, 0, 0 ),
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ft_frame_skip = FT_MAKE_FRAME_OP( FT_FRAME_OP_BYTES, 0, 1 )
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} FT_Frame_Op;
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typedef struct FT_Frame_Field_
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{
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FT_Byte value;
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FT_Byte size;
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FT_UShort offset;
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} FT_Frame_Field;
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/* Construct an FT_Frame_Field out of a structure type and a field name. */
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/* The structure type must be set in the FT_STRUCTURE macro before */
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/* calling the FT_FRAME_START() macro. */
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/* */
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#define FT_FIELD_SIZE( f ) \
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(FT_Byte)sizeof ( ((FT_STRUCTURE*)0)->f )
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#define FT_FIELD_SIZE_DELTA( f ) \
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(FT_Byte)sizeof ( ((FT_STRUCTURE*)0)->f[0] )
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#define FT_FIELD_OFFSET( f ) \
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(FT_UShort)( offsetof( FT_STRUCTURE, f ) )
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#define FT_FRAME_FIELD( frame_op, field ) \
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{ \
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frame_op, \
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FT_FIELD_SIZE( field ), \
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FT_FIELD_OFFSET( field ) \
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}
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#define FT_MAKE_EMPTY_FIELD( frame_op ) { frame_op, 0, 0 }
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#define FT_FRAME_START( size ) { ft_frame_start, 0, size }
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#define FT_FRAME_END { ft_frame_end, 0, 0 }
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#define FT_FRAME_LONG( f ) FT_FRAME_FIELD( ft_frame_long_be, f )
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#define FT_FRAME_ULONG( f ) FT_FRAME_FIELD( ft_frame_ulong_be, f )
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#define FT_FRAME_SHORT( f ) FT_FRAME_FIELD( ft_frame_short_be, f )
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#define FT_FRAME_USHORT( f ) FT_FRAME_FIELD( ft_frame_ushort_be, f )
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#define FT_FRAME_OFF3( f ) FT_FRAME_FIELD( ft_frame_off3_be, f )
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#define FT_FRAME_UOFF3( f ) FT_FRAME_FIELD( ft_frame_uoff3_be, f )
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#define FT_FRAME_BYTE( f ) FT_FRAME_FIELD( ft_frame_byte, f )
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#define FT_FRAME_CHAR( f ) FT_FRAME_FIELD( ft_frame_schar, f )
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#define FT_FRAME_LONG_LE( f ) FT_FRAME_FIELD( ft_frame_long_le, f )
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#define FT_FRAME_ULONG_LE( f ) FT_FRAME_FIELD( ft_frame_ulong_le, f )
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#define FT_FRAME_SHORT_LE( f ) FT_FRAME_FIELD( ft_frame_short_le, f )
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#define FT_FRAME_USHORT_LE( f ) FT_FRAME_FIELD( ft_frame_ushort_le, f )
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#define FT_FRAME_OFF3_LE( f ) FT_FRAME_FIELD( ft_frame_off3_le, f )
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#define FT_FRAME_UOFF3_LE( f ) FT_FRAME_FIELD( ft_frame_uoff3_le, f )
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#define FT_FRAME_SKIP_LONG { ft_frame_long_be, 0, 0 }
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#define FT_FRAME_SKIP_SHORT { ft_frame_short_be, 0, 0 }
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#define FT_FRAME_SKIP_BYTE { ft_frame_byte, 0, 0 }
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#define FT_FRAME_BYTES( field, count ) \
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{ \
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ft_frame_bytes, \
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count, \
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FT_FIELD_OFFSET( field ) \
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}
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#define FT_FRAME_SKIP_BYTES( count ) { ft_frame_skip, count, 0 }
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/*************************************************************************/
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/* */
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/* Integer extraction macros -- the `buffer' parameter must ALWAYS be of */
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/* type `char*' or equivalent (1-byte elements). */
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/* */
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#define FT_BYTE_( p, i ) ( ((const FT_Byte*)(p))[(i)] )
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#define FT_INT8_( p, i ) ( ((const FT_Char*)(p))[(i)] )
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#define FT_INT16( x ) ( (FT_Int16)(x) )
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#define FT_UINT16( x ) ( (FT_UInt16)(x) )
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#define FT_INT32( x ) ( (FT_Int32)(x) )
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#define FT_UINT32( x ) ( (FT_UInt32)(x) )
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#define FT_BYTE_I16( p, i, s ) ( FT_INT16( FT_BYTE_( p, i ) ) << (s) )
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#define FT_BYTE_U16( p, i, s ) ( FT_UINT16( FT_BYTE_( p, i ) ) << (s) )
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#define FT_BYTE_I32( p, i, s ) ( FT_INT32( FT_BYTE_( p, i ) ) << (s) )
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#define FT_BYTE_U32( p, i, s ) ( FT_UINT32( FT_BYTE_( p, i ) ) << (s) )
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#define FT_INT8_I16( p, i, s ) ( FT_INT16( FT_INT8_( p, i ) ) << (s) )
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#define FT_INT8_U16( p, i, s ) ( FT_UINT16( FT_INT8_( p, i ) ) << (s) )
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#define FT_INT8_I32( p, i, s ) ( FT_INT32( FT_INT8_( p, i ) ) << (s) )
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#define FT_INT8_U32( p, i, s ) ( FT_UINT32( FT_INT8_( p, i ) ) << (s) )
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#define FT_PEEK_SHORT( p ) FT_INT16( FT_INT8_I16( p, 0, 8) | \
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FT_BYTE_I16( p, 1, 0) )
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#define FT_PEEK_USHORT( p ) FT_UINT16( FT_BYTE_U16( p, 0, 8 ) | \
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FT_BYTE_U16( p, 1, 0 ) )
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#define FT_PEEK_LONG( p ) FT_INT32( FT_INT8_I32( p, 0, 24 ) | \
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FT_BYTE_I32( p, 1, 16 ) | \
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FT_BYTE_I32( p, 2, 8 ) | \
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FT_BYTE_I32( p, 3, 0 ) )
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#define FT_PEEK_ULONG( p ) FT_UINT32( FT_BYTE_U32( p, 0, 24 ) | \
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FT_BYTE_U32( p, 1, 16 ) | \
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FT_BYTE_U32( p, 2, 8 ) | \
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FT_BYTE_U32( p, 3, 0 ) )
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#define FT_PEEK_OFF3( p ) FT_INT32( FT_INT8_I32( p, 0, 16 ) | \
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FT_BYTE_I32( p, 1, 8 ) | \
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FT_BYTE_I32( p, 2, 0 ) )
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#define FT_PEEK_UOFF3( p ) FT_UINT32( FT_BYTE_U32( p, 0, 16 ) | \
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FT_BYTE_U32( p, 1, 8 ) | \
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FT_BYTE_U32( p, 2, 0 ) )
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#define FT_PEEK_SHORT_LE( p ) FT_INT16( FT_INT8_I16( p, 1, 8 ) | \
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FT_BYTE_I16( p, 0, 0 ) )
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#define FT_PEEK_USHORT_LE( p ) FT_UINT16( FT_BYTE_U16( p, 1, 8 ) | \
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FT_BYTE_U16( p, 0, 0 ) )
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#define FT_PEEK_LONG_LE( p ) FT_INT32( FT_INT8_I32( p, 3, 24 ) | \
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FT_BYTE_I32( p, 2, 16 ) | \
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FT_BYTE_I32( p, 1, 8 ) | \
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FT_BYTE_I32( p, 0, 0 ) )
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#define FT_PEEK_ULONG_LE( p ) FT_UINT32( FT_BYTE_U32( p, 3, 24 ) | \
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FT_BYTE_U32( p, 2, 16 ) | \
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FT_BYTE_U32( p, 1, 8 ) | \
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FT_BYTE_U32( p, 0, 0 ) )
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#define FT_PEEK_OFF3_LE( p ) FT_INT32( FT_INT8_I32( p, 2, 16 ) | \
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FT_BYTE_I32( p, 1, 8 ) | \
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FT_BYTE_I32( p, 0, 0 ) )
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#define FT_PEEK_UOFF3_LE( p ) FT_UINT32( FT_BYTE_U32( p, 2, 16 ) | \
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FT_BYTE_U32( p, 1, 8 ) | \
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FT_BYTE_U32( p, 0, 0 ) )
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#define FT_NEXT_CHAR( buffer ) \
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( (signed char)*buffer++ )
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#define FT_NEXT_BYTE( buffer ) \
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( (unsigned char)*buffer++ )
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#define FT_NEXT_SHORT( buffer ) \
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( (short)( buffer += 2, FT_PEEK_SHORT( buffer - 2 ) ) )
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#define FT_NEXT_USHORT( buffer ) \
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( (unsigned short)( buffer += 2, FT_PEEK_USHORT( buffer - 2 ) ) )
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#define FT_NEXT_OFF3( buffer ) \
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( (long)( buffer += 3, FT_PEEK_OFF3( buffer - 3 ) ) )
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#define FT_NEXT_UOFF3( buffer ) \
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( (unsigned long)( buffer += 3, FT_PEEK_UOFF3( buffer - 3 ) ) )
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#define FT_NEXT_LONG( buffer ) \
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( (long)( buffer += 4, FT_PEEK_LONG( buffer - 4 ) ) )
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#define FT_NEXT_ULONG( buffer ) \
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( (unsigned long)( buffer += 4, FT_PEEK_ULONG( buffer - 4 ) ) )
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#define FT_NEXT_SHORT_LE( buffer ) \
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( (short)( buffer += 2, FT_PEEK_SHORT_LE( buffer - 2 ) ) )
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#define FT_NEXT_USHORT_LE( buffer ) \
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( (unsigned short)( buffer += 2, FT_PEEK_USHORT_LE( buffer - 2 ) ) )
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#define FT_NEXT_OFF3_LE( buffer ) \
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( (long)( buffer += 3, FT_PEEK_OFF3_LE( buffer - 3 ) ) )
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#define FT_NEXT_UOFF3_LE( buffer ) \
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( (unsigned long)( buffer += 3, FT_PEEK_UOFF3_LE( buffer - 3 ) ) )
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#define FT_NEXT_LONG_LE( buffer ) \
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( (long)( buffer += 4, FT_PEEK_LONG_LE( buffer - 4 ) ) )
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#define FT_NEXT_ULONG_LE( buffer ) \
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( (unsigned long)( buffer += 4, FT_PEEK_ULONG_LE( buffer - 4 ) ) )
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/*************************************************************************/
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/* */
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/* Each GET_xxxx() macro uses an implicit `stream' variable. */
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/* */
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#define FT_GET_MACRO( func, type ) ( (type)func( stream ) )
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#define FT_GET_CHAR() FT_GET_MACRO( FT_Stream_GetChar, FT_Char )
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#define FT_GET_BYTE() FT_GET_MACRO( FT_Stream_GetChar, FT_Byte )
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#define FT_GET_SHORT() FT_GET_MACRO( FT_Stream_GetShort, FT_Short )
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#define FT_GET_USHORT() FT_GET_MACRO( FT_Stream_GetShort, FT_UShort )
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#define FT_GET_OFF3() FT_GET_MACRO( FT_Stream_GetOffset, FT_Long )
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#define FT_GET_UOFF3() FT_GET_MACRO( FT_Stream_GetOffset, FT_ULong )
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#define FT_GET_LONG() FT_GET_MACRO( FT_Stream_GetLong, FT_Long )
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#define FT_GET_ULONG() FT_GET_MACRO( FT_Stream_GetLong, FT_ULong )
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#define FT_GET_TAG4() FT_GET_MACRO( FT_Stream_GetLong, FT_ULong )
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#define FT_GET_SHORT_LE() FT_GET_MACRO( FT_Stream_GetShortLE, FT_Short )
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#define FT_GET_USHORT_LE() FT_GET_MACRO( FT_Stream_GetShortLE, FT_UShort )
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#define FT_GET_LONG_LE() FT_GET_MACRO( FT_Stream_GetLongLE, FT_Long )
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#define FT_GET_ULONG_LE() FT_GET_MACRO( FT_Stream_GetLongLE, FT_ULong )
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#define FT_READ_MACRO( func, type, var ) \
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( var = (type)func( stream, &error ), \
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error != FT_Err_Ok )
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#define FT_READ_BYTE( var ) FT_READ_MACRO( FT_Stream_ReadChar, FT_Byte, var )
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#define FT_READ_CHAR( var ) FT_READ_MACRO( FT_Stream_ReadChar, FT_Char, var )
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#define FT_READ_SHORT( var ) FT_READ_MACRO( FT_Stream_ReadShort, FT_Short, var )
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#define FT_READ_USHORT( var ) FT_READ_MACRO( FT_Stream_ReadShort, FT_UShort, var )
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#define FT_READ_OFF3( var ) FT_READ_MACRO( FT_Stream_ReadOffset, FT_Long, var )
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#define FT_READ_UOFF3( var ) FT_READ_MACRO( FT_Stream_ReadOffset, FT_ULong, var )
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#define FT_READ_LONG( var ) FT_READ_MACRO( FT_Stream_ReadLong, FT_Long, var )
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#define FT_READ_ULONG( var ) FT_READ_MACRO( FT_Stream_ReadLong, FT_ULong, var )
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#define FT_READ_SHORT_LE( var ) FT_READ_MACRO( FT_Stream_ReadShortLE, FT_Short, var )
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#define FT_READ_USHORT_LE( var ) FT_READ_MACRO( FT_Stream_ReadShortLE, FT_UShort, var )
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#define FT_READ_LONG_LE( var ) FT_READ_MACRO( FT_Stream_ReadLongLE, FT_Long, var )
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#define FT_READ_ULONG_LE( var ) FT_READ_MACRO( FT_Stream_ReadLongLE, FT_ULong, var )
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#ifndef FT_CONFIG_OPTION_NO_DEFAULT_SYSTEM
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/* initialize a stream for reading a regular system stream */
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FT_EXPORT( FT_Error )
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FT_Stream_Open( FT_Stream stream,
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const char* filepathname );
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#endif /* FT_CONFIG_OPTION_NO_DEFAULT_SYSTEM */
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/* initialize a stream for reading in-memory data */
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FT_BASE( void )
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FT_Stream_OpenMemory( FT_Stream stream,
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const FT_Byte* base,
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FT_ULong size );
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/* close a stream (does not destroy the stream structure) */
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FT_BASE( void )
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FT_Stream_Close( FT_Stream stream );
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/* seek within a stream. position is relative to start of stream */
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FT_BASE( FT_Error )
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FT_Stream_Seek( FT_Stream stream,
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FT_ULong pos );
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/* skip bytes in a stream */
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FT_BASE( FT_Error )
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FT_Stream_Skip( FT_Stream stream,
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FT_Long distance );
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/* return current stream position */
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FT_BASE( FT_Long )
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FT_Stream_Pos( FT_Stream stream );
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/* read bytes from a stream into a user-allocated buffer, returns an */
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/* error if not all bytes could be read. */
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FT_BASE( FT_Error )
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FT_Stream_Read( FT_Stream stream,
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FT_Byte* buffer,
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FT_ULong count );
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/* read bytes from a stream at a given position */
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FT_BASE( FT_Error )
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FT_Stream_ReadAt( FT_Stream stream,
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FT_ULong pos,
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FT_Byte* buffer,
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FT_ULong count );
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/* Enter a frame of `count' consecutive bytes in a stream. Returns an */
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/* error if the frame could not be read/accessed. The caller can use */
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/* the FT_Stream_Get_XXX functions to retrieve frame data without */
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/* error checks. */
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/* */
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/* You must _always_ call FT_Stream_ExitFrame() once you have entered */
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/* a stream frame! */
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/* */
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FT_BASE( FT_Error )
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FT_Stream_EnterFrame( FT_Stream stream,
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FT_ULong count );
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/* exit a stream frame */
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FT_BASE( void )
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FT_Stream_ExitFrame( FT_Stream stream );
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/* Extract a stream frame. If the stream is disk-based, a heap block */
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/* is allocated and the frame bytes are read into it. If the stream */
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/* is memory-based, this function simply set a pointer to the data. */
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/* */
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/* Useful to optimize access to memory-based streams transparently. */
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/* */
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/* All extracted frames must be `freed` with a call to the function */
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/* FT_Stream_ReleaseFrame(). */
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/* */
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FT_BASE( FT_Error )
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FT_Stream_ExtractFrame( FT_Stream stream,
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FT_ULong count,
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FT_Byte** pbytes );
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/* release an extract frame (see FT_Stream_ExtractFrame) */
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FT_BASE( void )
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FT_Stream_ReleaseFrame( FT_Stream stream,
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FT_Byte** pbytes );
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/* read a byte from an entered frame */
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FT_BASE( FT_Char )
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FT_Stream_GetChar( FT_Stream stream );
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/* read a 16-bit big-endian integer from an entered frame */
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FT_BASE( FT_Short )
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FT_Stream_GetShort( FT_Stream stream );
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/* read a 24-bit big-endian integer from an entered frame */
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FT_BASE( FT_Long )
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FT_Stream_GetOffset( FT_Stream stream );
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/* read a 32-bit big-endian integer from an entered frame */
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FT_BASE( FT_Long )
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FT_Stream_GetLong( FT_Stream stream );
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/* read a 16-bit little-endian integer from an entered frame */
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FT_BASE( FT_Short )
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FT_Stream_GetShortLE( FT_Stream stream );
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|
|
|
/* read a 32-bit little-endian integer from an entered frame */
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|
FT_BASE( FT_Long )
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FT_Stream_GetLongLE( FT_Stream stream );
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|
|
|
|
|
/* read a byte from a stream */
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|
FT_BASE( FT_Char )
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|
FT_Stream_ReadChar( FT_Stream stream,
|
|
FT_Error* error );
|
|
|
|
/* read a 16-bit big-endian integer from a stream */
|
|
FT_BASE( FT_Short )
|
|
FT_Stream_ReadShort( FT_Stream stream,
|
|
FT_Error* error );
|
|
|
|
/* read a 24-bit big-endian integer from a stream */
|
|
FT_BASE( FT_Long )
|
|
FT_Stream_ReadOffset( FT_Stream stream,
|
|
FT_Error* error );
|
|
|
|
/* read a 32-bit big-endian integer from a stream */
|
|
FT_BASE( FT_Long )
|
|
FT_Stream_ReadLong( FT_Stream stream,
|
|
FT_Error* error );
|
|
|
|
/* read a 16-bit little-endian integer from a stream */
|
|
FT_BASE( FT_Short )
|
|
FT_Stream_ReadShortLE( FT_Stream stream,
|
|
FT_Error* error );
|
|
|
|
/* read a 32-bit little-endian integer from a stream */
|
|
FT_BASE( FT_Long )
|
|
FT_Stream_ReadLongLE( FT_Stream stream,
|
|
FT_Error* error );
|
|
|
|
/* Read a structure from a stream. The structure must be described */
|
|
/* by an array of FT_Frame_Field records. */
|
|
FT_BASE( FT_Error )
|
|
FT_Stream_ReadFields( FT_Stream stream,
|
|
const FT_Frame_Field* fields,
|
|
void* structure );
|
|
|
|
|
|
#define FT_STREAM_POS() \
|
|
FT_Stream_Pos( stream )
|
|
|
|
#define FT_STREAM_SEEK( position ) \
|
|
FT_SET_ERROR( FT_Stream_Seek( stream, position ) )
|
|
|
|
#define FT_STREAM_SKIP( distance ) \
|
|
FT_SET_ERROR( FT_Stream_Skip( stream, distance ) )
|
|
|
|
#define FT_STREAM_READ( buffer, count ) \
|
|
FT_SET_ERROR( FT_Stream_Read( stream, \
|
|
(FT_Byte*)buffer, \
|
|
count ) )
|
|
|
|
#define FT_STREAM_READ_AT( position, buffer, count ) \
|
|
FT_SET_ERROR( FT_Stream_ReadAt( stream, \
|
|
position, \
|
|
(FT_Byte*)buffer, \
|
|
count ) )
|
|
|
|
#define FT_STREAM_READ_FIELDS( fields, object ) \
|
|
FT_SET_ERROR( FT_Stream_ReadFields( stream, fields, object ) )
|
|
|
|
|
|
#define FT_FRAME_ENTER( size ) \
|
|
FT_SET_ERROR( FT_Stream_EnterFrame( stream, size ) )
|
|
|
|
#define FT_FRAME_EXIT() \
|
|
FT_Stream_ExitFrame( stream )
|
|
|
|
#define FT_FRAME_EXTRACT( size, bytes ) \
|
|
FT_SET_ERROR( FT_Stream_ExtractFrame( stream, size, \
|
|
(FT_Byte**)&(bytes) ) )
|
|
|
|
#define FT_FRAME_RELEASE( bytes ) \
|
|
FT_Stream_ReleaseFrame( stream, (FT_Byte**)&(bytes) )
|
|
|
|
|
|
FT_END_HEADER
|
|
|
|
#endif /* __FTSTREAM_H__ */
|
|
|
|
|
|
/* END */
|