www.pudn.com > freetype.rar > ftstream.h
/***************************************************************************/
/* */
/* ftstream.h */
/* */
/* Stream handling (specification). */
/* */
/* Copyright 1996-2001, 2002 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 "freetype/ftsystem.h"
#include "freetype/internal/ftobjs.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. */
/* */
#define FT_GET_MACRO( func, type ) ( (type)func( stream ) )
#define FT_GET_CHAR() FT_GET_MACRO( FT_Stream_GetChar, FT_Char )
#define FT_GET_BYTE() FT_GET_MACRO( FT_Stream_GetChar, FT_Byte )
#define FT_GET_SHORT() FT_GET_MACRO( FT_Stream_GetShort, FT_Short )
#define FT_GET_USHORT() FT_GET_MACRO( FT_Stream_GetShort, FT_UShort )
#define FT_GET_OFF3() FT_GET_MACRO( FT_Stream_GetOffset, FT_Long )
#define FT_GET_UOFF3() FT_GET_MACRO( FT_Stream_GetOffset, FT_ULong )
#define FT_GET_LONG() FT_GET_MACRO( FT_Stream_GetLong, FT_Long )
#define FT_GET_ULONG() FT_GET_MACRO( FT_Stream_GetLong, FT_ULong )
#define FT_GET_TAG4() FT_GET_MACRO( FT_Stream_GetLong, FT_ULong )
#define FT_GET_SHORT_LE() FT_GET_MACRO( FT_Stream_GetShortLE, FT_Short )
#define FT_GET_USHORT_LE() FT_GET_MACRO( FT_Stream_GetShortLE, FT_UShort )
#define FT_GET_LONG_LE() FT_GET_MACRO( FT_Stream_GetLongLE, FT_Long )
#define FT_GET_ULONG_LE() FT_GET_MACRO( FT_Stream_GetLongLE, FT_ULong )
#define FT_READ_MACRO( func, type, var ) \
( var = (type)func( stream, &error ), \
error != FT_Err_Ok )
#define FT_READ_BYTE( var ) FT_READ_MACRO( FT_Stream_ReadChar, FT_Byte, var )
#define FT_READ_CHAR( var ) FT_READ_MACRO( FT_Stream_ReadChar, FT_Char, var )
#define FT_READ_SHORT( var ) FT_READ_MACRO( FT_Stream_ReadShort, FT_Short, var )
#define FT_READ_USHORT( var ) FT_READ_MACRO( FT_Stream_ReadShort, FT_UShort, var )
#define FT_READ_OFF3( var ) FT_READ_MACRO( FT_Stream_ReadOffset, FT_Long, var )
#define FT_READ_UOFF3( var ) FT_READ_MACRO( FT_Stream_ReadOffset, FT_ULong, var )
#define FT_READ_LONG( var ) FT_READ_MACRO( FT_Stream_ReadLong, FT_Long, var )
#define FT_READ_ULONG( var ) FT_READ_MACRO( FT_Stream_ReadLong, FT_ULong, var )
#define FT_READ_SHORT_LE( var ) FT_READ_MACRO( FT_Stream_ReadShortLE, FT_Short, var )
#define FT_READ_USHORT_LE( var ) FT_READ_MACRO( FT_Stream_ReadShortLE, FT_UShort, var )
#define FT_READ_LONG_LE( var ) FT_READ_MACRO( FT_Stream_ReadLongLE, FT_Long, var )
#define FT_READ_ULONG_LE( var ) FT_READ_MACRO( FT_Stream_ReadLongLE, FT_ULong, var )
#ifndef FT_CONFIG_OPTION_NO_DEFAULT_SYSTEM
/* initialize a stream for reading a regular system stream */
FT_EXPORT( FT_Error )
FT_Stream_Open( FT_Stream stream,
const char* filepathname );
#endif /* FT_CONFIG_OPTION_NO_DEFAULT_SYSTEM */
/* initialize a stream for reading in-memory data */
FT_BASE( void )
FT_Stream_OpenMemory( FT_Stream stream,
const FT_Byte* base,
FT_ULong size );
/* close a stream (does not destroy the stream structure) */
FT_BASE( void )
FT_Stream_Close( FT_Stream stream );
/* seek within a stream. position is relative to start of stream */
FT_BASE( FT_Error )
FT_Stream_Seek( FT_Stream stream,
FT_ULong pos );
/* skip bytes in a stream */
FT_BASE( FT_Error )
FT_Stream_Skip( FT_Stream stream,
FT_Long distance );
/* return current stream position */
FT_BASE( FT_Long )
FT_Stream_Pos( FT_Stream stream );
/* read bytes from a stream into a user-allocated buffer, returns an */
/* error if not all bytes could be read. */
FT_BASE( FT_Error )
FT_Stream_Read( FT_Stream stream,
FT_Byte* buffer,
FT_ULong count );
/* read bytes from a stream at a given position */
FT_BASE( FT_Error )
FT_Stream_ReadAt( FT_Stream stream,
FT_ULong pos,
FT_Byte* buffer,
FT_ULong count );
/* Enter a frame of `count' consecutive bytes in a stream. Returns an */
/* error if the frame could not be read/accessed. The caller can use */
/* the FT_Stream_Get_XXX functions to retrieve frame data without */
/* error checks. */
/* */
/* You must _always_ call FT_Stream_ExitFrame() once you have entered */
/* a stream frame! */
/* */
FT_BASE( FT_Error )
FT_Stream_EnterFrame( FT_Stream stream,
FT_ULong count );
/* exit a stream frame */
FT_BASE( void )
FT_Stream_ExitFrame( FT_Stream stream );
/* Extract a stream frame. If the stream is disk-based, a heap block */
/* is allocated and the frame bytes are read into it. If the stream */
/* is memory-based, this function simply set a pointer to the data. */
/* */
/* Useful to optimize access to memory-based streams transparently. */
/* */
/* All extracted frames must be `freed` with a call to the function */
/* FT_Stream_ReleaseFrame(). */
/* */
FT_BASE( FT_Error )
FT_Stream_ExtractFrame( FT_Stream stream,
FT_ULong count,
FT_Byte** pbytes );
/* release an extract frame (see FT_Stream_ExtractFrame) */
FT_BASE( void )
FT_Stream_ReleaseFrame( FT_Stream stream,
FT_Byte** pbytes );
/* read a byte from an entered frame */
FT_BASE( FT_Char )
FT_Stream_GetChar( FT_Stream stream );
/* read a 16-bit big-endian integer from an entered frame */
FT_BASE( FT_Short )
FT_Stream_GetShort( FT_Stream stream );
/* read a 24-bit big-endian integer from an entered frame */
FT_BASE( FT_Long )
FT_Stream_GetOffset( FT_Stream stream );
/* read a 32-bit big-endian integer from an entered frame */
FT_BASE( FT_Long )
FT_Stream_GetLong( FT_Stream stream );
/* read a 16-bit little-endian integer from an entered frame */
FT_BASE( FT_Short )
FT_Stream_GetShortLE( FT_Stream stream );
/* read a 32-bit little-endian integer from an entered frame */
FT_BASE( FT_Long )
FT_Stream_GetLongLE( FT_Stream stream );
/* read a byte from a stream */
FT_BASE( FT_Char )
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 */