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/*
Crown Copyright (c) 1997
This TenDRA(r) Computer Program is subject to Copyright
owned by the United Kingdom Secretary of State for Defence
acting through the Defence Evaluation and Research Agency
(DERA). It is made available to Recipients with a
royalty-free licence for its use, reproduction, transfer
to other parties and amendment for any purpose not excluding
product development provided that any such use et cetera
shall be deemed to be acceptance of the following conditions:-
(1) Its Recipients shall ensure that this Notice is
reproduced upon any copies or amended versions of it;
(2) Any amended version of it shall be clearly marked to
show both the nature of and the organisation responsible
for the relevant amendment or amendments;
(3) Its onward transfer from a recipient to another
party shall be deemed to be that party's acceptance of
these conditions;
(4) DERA gives no warranty or assurance as to its
quality or suitability for any purpose and DERA accepts
no liability whatsoever in relation to any use to which
it may be put.
*/
/**** bistream.h --- Binary input stream handling.
*
** Author: Steve Folkes <smf@hermes.mod.uk>
*
**** Commentary:
*
***=== INTRODUCTION =========================================================
*
* This file specifies the interface to the binary input stream facility.
*
***=== TYPES ================================================================
*
** Type: BIStreamT
** Type: BIStreamP
** Repr: <private>
*
* This is the input stream type.
*
***=== FUNCTIONS ============================================================
*
** Function: void bistream_init
* PROTO_S ((BIStreamP bistream))
** Exceptions:
*
* This function initialises the specified bistream not to read from any file.
*
** Function: BoolT bistream_open
* PROTO_S ((BIStreamP bistream, CStringP name))
** Exceptions:
*
* This function initialises the specified bistream to read from the file with
* the specified name. The name should not be modified or deallocated until
* the bistream has been closed. If the file cannot be opened, the function
* returns false. If the file is opened successfully, the function returns
* true.
*
** Function: void bistream_assign
* PROTO_S ((BIStreamP to, BIStreamP from))
** Exceptions:
*
* This function assigns the from bistream to the to bistream. The from
* bistream should not be used again.
*
** Function: BoolT bistream_is_open
* PROTO_S ((BIStreamP bistream))
*
* This function returns true if the specified bistream is reading from a file,
* and false otherwise.
*
** Function: unsigned bistream_read_chars
* PROTO_S ((BIStreamP bistream, unsigned length,
* CStringP chars))
** Exceptions: XX_bistream_read_error
*
* This function reads the next length characters from the specified bistream.
* The characters read are placed in the chars vector, which should be long
* enough to hold at least length characters. The function returns the number
* of characters actually read.
*
** Function: unsigned bistream_read_bytes
* PROTO_S ((BIStreamP bistream, unsigned length,
* ByteP bytes))
** Exceptions: XX_bistream_read_error
*
* This function reads the next length bytes from the specified bistream. The
* bytes read are placed in the bytes vector, which should be long enough to
* hold at least length bytes. The function returns the number of bytes
* actually read.
*
** Function: BoolT bistream_read_byte
* PROTO_S ((BIStreamP bistream, ByteT *byte_ref))
** Exceptions: XX_bistream_read_error
*
* This function reads the next character from the specified bistream. If a
* byte is read then the byte is assigned to the reference argument, and the
* function returns true. If the end of file is reached, the function returns
* false.
*
** Function: unsigned bistream_byte
* PROTO_S ((BIStreamP bistream))
** Exceptions:
*
* This function returns the number of bytes that have been read from the
* specified bistream.
*
** Function: CStringP bistream_name
* PROTO_S ((BIStreamP bistream))
** Exceptions:
*
* This function returns the name of the file from which the specified
* bistream is reading. The return value should not be modified or
* deallocated.
*
** Function: void bistream_rewind
* PROTO_S ((BIStreamP bistream))
** Exceptions:
*
* This function rewinds the specified bistream.
*
** Function: void bistream_close
* PROTO_S ((BIStreamP bistream))
** Exceptions:
*
* This function closes the specified bistream.
*
***=== EXCEPTIONS ===========================================================
*
** Exception: XX_bistream_read_error (CStringP name)
*
* This exception is raised if a read attempt fails. The data thrown is a
* copy of the name of the file that the read error occured on. The copy
* should be deallocated when finished with.
*
**** Change Log:
* $Log: bistream.h,v $
* Revision 1.1.1.1 1998/01/17 15:57:17 release
* First version to be checked into rolling release.
*
* Revision 1.2 1994/12/12 11:45:19 smf
* Performing changes for 'CR94_178.sid+tld-update' - bringing in line with
* OSSG C Coding Standards.
*
* Revision 1.1.1.1 1994/07/25 16:06:13 smf
* Initial import of os-interface shared files.
*
**/
/****************************************************************************/
#ifndef H_BISTREAM
#define H_BISTREAM
#include "os-interface.h"
#include "exception.h"
/*--------------------------------------------------------------------------*/
typedef struct BIStreamT {
FILE *file;
unsigned bytes;
CStringP name;
} BIStreamT, *BIStreamP;
/*--------------------------------------------------------------------------*/
extern ExceptionP XX_bistream_read_error;
/*--------------------------------------------------------------------------*/
extern void bistream_init
PROTO_S ((BIStreamP));
extern BoolT bistream_open
PROTO_S ((BIStreamP, CStringP));
extern void bistream_assign
PROTO_S ((BIStreamP, BIStreamP));
extern BoolT bistream_is_open
PROTO_S ((BIStreamP));
extern unsigned bistream_read_chars
PROTO_S ((BIStreamP, unsigned, CStringP));
extern unsigned bistream_read_bytes
PROTO_S ((BIStreamP, unsigned, ByteP));
extern BoolT bistream_read_byte
PROTO_S ((BIStreamP, ByteT *));
extern unsigned bistream_byte
PROTO_S ((BIStreamP));
extern CStringP bistream_name
PROTO_S ((BIStreamP));
extern void bistream_rewind
PROTO_S ((BIStreamP));
extern void bistream_close
PROTO_S ((BIStreamP));
#endif /* !defined (H_BISTREAM) */