ftstream.h

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#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 */