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470 lines
15 KiB
C
470 lines
15 KiB
C
/*
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* Copyright (c) 1999-2000 Image Power, Inc. and the University of
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* British Columbia.
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* Copyright (c) 2001-2003 Michael David Adams.
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* All rights reserved.
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*/
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/* __START_OF_JASPER_LICENSE__
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*
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* JasPer License Version 2.0
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*
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* Copyright (c) 2001-2006 Michael David Adams
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* Copyright (c) 1999-2000 Image Power, Inc.
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* Copyright (c) 1999-2000 The University of British Columbia
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*
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* All rights reserved.
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*
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* Permission is hereby granted, free of charge, to any person (the
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* "User") obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without restriction,
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* including without limitation the rights to use, copy, modify, merge,
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* publish, distribute, and/or sell copies of the Software, and to permit
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* persons to whom the Software is furnished to do so, subject to the
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* following conditions:
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*
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* 1. The above copyright notices and this permission notice (which
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* includes the disclaimer below) shall be included in all copies or
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* substantial portions of the Software.
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*
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* 2. The name of a copyright holder shall not be used to endorse or
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* promote products derived from the Software without specific prior
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* written permission.
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*
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* THIS DISCLAIMER OF WARRANTY CONSTITUTES AN ESSENTIAL PART OF THIS
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* LICENSE. NO USE OF THE SOFTWARE IS AUTHORIZED HEREUNDER EXCEPT UNDER
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* THIS DISCLAIMER. THE SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS
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* "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
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* BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
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* PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. IN NO
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* EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, OR ANY SPECIAL
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* INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER RESULTING
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* FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
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* NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
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* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. NO ASSURANCES ARE
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* PROVIDED BY THE COPYRIGHT HOLDERS THAT THE SOFTWARE DOES NOT INFRINGE
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* THE PATENT OR OTHER INTELLECTUAL PROPERTY RIGHTS OF ANY OTHER ENTITY.
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* EACH COPYRIGHT HOLDER DISCLAIMS ANY LIABILITY TO THE USER FOR CLAIMS
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* BROUGHT BY ANY OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL
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* PROPERTY RIGHTS OR OTHERWISE. AS A CONDITION TO EXERCISING THE RIGHTS
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* GRANTED HEREUNDER, EACH USER HEREBY ASSUMES SOLE RESPONSIBILITY TO SECURE
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* ANY OTHER INTELLECTUAL PROPERTY RIGHTS NEEDED, IF ANY. THE SOFTWARE
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* IS NOT FAULT-TOLERANT AND IS NOT INTENDED FOR USE IN MISSION-CRITICAL
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* SYSTEMS, SUCH AS THOSE USED IN THE OPERATION OF NUCLEAR FACILITIES,
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* AIRCRAFT NAVIGATION OR COMMUNICATION SYSTEMS, AIR TRAFFIC CONTROL
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* SYSTEMS, DIRECT LIFE SUPPORT MACHINES, OR WEAPONS SYSTEMS, IN WHICH
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* THE FAILURE OF THE SOFTWARE OR SYSTEM COULD LEAD DIRECTLY TO DEATH,
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* PERSONAL INJURY, OR SEVERE PHYSICAL OR ENVIRONMENTAL DAMAGE ("HIGH
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* RISK ACTIVITIES"). THE COPYRIGHT HOLDERS SPECIFICALLY DISCLAIM ANY
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* EXPRESS OR IMPLIED WARRANTY OF FITNESS FOR HIGH RISK ACTIVITIES.
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*
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* __END_OF_JASPER_LICENSE__
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*/
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/*
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* I/O Stream Class
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*
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* $Id: jas_stream.h,v 1.2 2008-05-26 09:41:51 vp153 Exp $
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*/
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#ifndef JAS_STREAM_H
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#define JAS_STREAM_H
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/******************************************************************************\
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* Includes.
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\******************************************************************************/
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#include <jasper/jas_config.h>
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#include <stdio.h>
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#include <limits.h>
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#if defined(HAVE_FCNTL_H)
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#include <fcntl.h>
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#endif
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#include <string.h>
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#if defined(HAVE_UNISTD_H)
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#include <unistd.h>
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#endif
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#include <jasper/jas_types.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/******************************************************************************\
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* Constants.
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\******************************************************************************/
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/* On most UNIX systems, we probably need to define O_BINARY ourselves. */
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#ifndef O_BINARY
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#define O_BINARY 0
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#endif
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/*
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* Stream open flags.
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*/
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/* The stream was opened for reading. */
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#define JAS_STREAM_READ 0x0001
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/* The stream was opened for writing. */
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#define JAS_STREAM_WRITE 0x0002
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/* The stream was opened for appending. */
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#define JAS_STREAM_APPEND 0x0004
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/* The stream was opened in binary mode. */
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#define JAS_STREAM_BINARY 0x0008
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/* The stream should be created/truncated. */
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#define JAS_STREAM_CREATE 0x0010
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/*
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* Stream buffering flags.
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*/
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/* The stream is unbuffered. */
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#define JAS_STREAM_UNBUF 0x0000
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/* The stream is line buffered. */
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#define JAS_STREAM_LINEBUF 0x0001
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/* The stream is fully buffered. */
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#define JAS_STREAM_FULLBUF 0x0002
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/* The buffering mode mask. */
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#define JAS_STREAM_BUFMODEMASK 0x000f
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/* The memory associated with the buffer needs to be deallocated when the
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stream is destroyed. */
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#define JAS_STREAM_FREEBUF 0x0008
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/* The buffer is currently being used for reading. */
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#define JAS_STREAM_RDBUF 0x0010
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/* The buffer is currently being used for writing. */
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#define JAS_STREAM_WRBUF 0x0020
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/*
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* Stream error flags.
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*/
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/* The end-of-file has been encountered (on reading). */
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#define JAS_STREAM_EOF 0x0001
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/* An I/O error has been encountered on the stream. */
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#define JAS_STREAM_ERR 0x0002
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/* The read/write limit has been exceeded. */
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#define JAS_STREAM_RWLIMIT 0x0004
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/* The error mask. */
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#define JAS_STREAM_ERRMASK \
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(JAS_STREAM_EOF | JAS_STREAM_ERR | JAS_STREAM_RWLIMIT)
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/*
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* Other miscellaneous constants.
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*/
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/* The default buffer size (for fully-buffered operation). */
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#define JAS_STREAM_BUFSIZE 8192
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/* The default permission mask for file creation. */
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#define JAS_STREAM_PERMS 0666
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/* The maximum number of characters that can always be put back on a stream. */
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#define JAS_STREAM_MAXPUTBACK 16
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/******************************************************************************\
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* Types.
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\******************************************************************************/
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/*
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* Generic file object.
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*/
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typedef void jas_stream_obj_t;
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/*
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* Generic file object operations.
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*/
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typedef struct {
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/* Read characters from a file object. */
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int (*read_)(jas_stream_obj_t *obj, char *buf, int cnt);
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/* Write characters to a file object. */
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int (*write_)(jas_stream_obj_t *obj, char *buf, int cnt);
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/* Set the position for a file object. */
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long (*seek_)(jas_stream_obj_t *obj, long offset, int origin);
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/* Close a file object. */
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int (*close_)(jas_stream_obj_t *obj);
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} jas_stream_ops_t;
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/*
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* Stream object.
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*/
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typedef struct {
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/* The mode in which the stream was opened. */
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int openmode_;
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/* The buffering mode. */
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int bufmode_;
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/* The stream status. */
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int flags_;
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/* The start of the buffer area to use for reading/writing. */
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uchar *bufbase_;
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/* The start of the buffer area excluding the extra initial space for
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character putback. */
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uchar *bufstart_;
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/* The buffer size. */
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int bufsize_;
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/* The current position in the buffer. */
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uchar *ptr_;
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/* The number of characters that must be read/written before
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the buffer needs to be filled/flushed. */
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int cnt_;
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/* A trivial buffer to be used for unbuffered operation. */
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uchar tinybuf_[JAS_STREAM_MAXPUTBACK + 1];
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/* The operations for the underlying stream file object. */
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jas_stream_ops_t *ops_;
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/* The underlying stream file object. */
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jas_stream_obj_t *obj_;
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/* The number of characters read/written. */
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long rwcnt_;
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/* The maximum number of characters that may be read/written. */
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long rwlimit_;
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} jas_stream_t;
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/*
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* Regular file object.
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*/
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/*
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* File descriptor file object.
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*/
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typedef struct {
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int fd;
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int flags;
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#if defined _WIN32 && !defined __MINGW__ && !defined __MINGW32__
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char pathname[MAX_PATH + 1];
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#else
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char pathname[PATH_MAX + 1];
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#endif
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} jas_stream_fileobj_t;
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#define JAS_STREAM_FILEOBJ_DELONCLOSE 0x01
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#define JAS_STREAM_FILEOBJ_NOCLOSE 0x02
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/*
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* Memory file object.
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*/
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typedef struct {
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/* The data associated with this file. */
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uchar *buf_;
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/* The allocated size of the buffer for holding file data. */
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int bufsize_;
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/* The length of the file. */
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int_fast32_t len_;
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/* The seek position. */
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int_fast32_t pos_;
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/* Is the buffer growable? */
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int growable_;
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/* Was the buffer allocated internally? */
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int myalloc_;
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} jas_stream_memobj_t;
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/******************************************************************************\
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* Macros/functions for opening and closing streams.
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\******************************************************************************/
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/* Open a file as a stream. */
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jas_stream_t *jas_stream_fopen(const char *filename, const char *mode);
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/* Open a memory buffer as a stream. */
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jas_stream_t *jas_stream_memopen(char *buf, int bufsize);
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/* Open a file descriptor as a stream. */
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jas_stream_t *jas_stream_fdopen(int fd, const char *mode);
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/* Open a stdio stream as a stream. */
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jas_stream_t *jas_stream_freopen(const char *path, const char *mode, FILE *fp);
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/* Open a temporary file as a stream. */
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jas_stream_t *jas_stream_tmpfile(void);
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/* Close a stream. */
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int jas_stream_close(jas_stream_t *stream);
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/******************************************************************************\
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* Macros/functions for getting/setting the stream state.
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\******************************************************************************/
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/* Get the EOF indicator for a stream. */
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#define jas_stream_eof(stream) \
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(((stream)->flags_ & JAS_STREAM_EOF) != 0)
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/* Get the error indicator for a stream. */
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#define jas_stream_error(stream) \
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(((stream)->flags_ & JAS_STREAM_ERR) != 0)
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/* Clear the error indicator for a stream. */
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#define jas_stream_clearerr(stream) \
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((stream)->flags_ &= ~(JAS_STREAM_ERR | JAS_STREAM_EOF))
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/* Get the read/write limit for a stream. */
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#define jas_stream_getrwlimit(stream) \
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(((const jas_stream_t *)(stream))->rwlimit_)
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/* Set the read/write limit for a stream. */
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int jas_stream_setrwlimit(jas_stream_t *stream, long rwlimit);
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/* Get the read/write count for a stream. */
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#define jas_stream_getrwcount(stream) \
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(((const jas_stream_t *)(stream))->rwcnt_)
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/* Set the read/write count for a stream. */
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long jas_stream_setrwcount(jas_stream_t *stream, long rwcnt);
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/******************************************************************************\
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* Macros/functions for I/O.
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\******************************************************************************/
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/* Read a character from a stream. */
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#if defined(DEBUG)
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#define jas_stream_getc(stream) jas_stream_getc_func(stream)
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#else
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#define jas_stream_getc(stream) jas_stream_getc_macro(stream)
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#endif
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/* Write a character to a stream. */
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#if defined(DEBUG)
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#define jas_stream_putc(stream, c) jas_stream_putc_func(stream, c)
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#else
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#define jas_stream_putc(stream, c) jas_stream_putc_macro(stream, c)
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#endif
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/* Read characters from a stream into a buffer. */
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int jas_stream_read(jas_stream_t *stream, void *buf, int cnt);
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/* Write characters from a buffer to a stream. */
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int jas_stream_write(jas_stream_t *stream, const void *buf, int cnt);
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/* Write formatted output to a stream. */
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int jas_stream_printf(jas_stream_t *stream, const char *fmt, ...);
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/* Write a string to a stream. */
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int jas_stream_puts(jas_stream_t *stream, const char *s);
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/* Read a line of input from a stream. */
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char *jas_stream_gets(jas_stream_t *stream, char *buf, int bufsize);
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/* Look at the next character to be read from a stream without actually
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removing it from the stream. */
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#define jas_stream_peekc(stream) \
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(((stream)->cnt_ <= 0) ? jas_stream_fillbuf(stream, 0) : \
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((int)(*(stream)->ptr_)))
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/* Put a character back on a stream. */
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int jas_stream_ungetc(jas_stream_t *stream, int c);
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/******************************************************************************\
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* Macros/functions for getting/setting the stream position.
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\******************************************************************************/
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/* Is it possible to seek on this stream? */
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int jas_stream_isseekable(jas_stream_t *stream);
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/* Set the current position within the stream. */
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long jas_stream_seek(jas_stream_t *stream, long offset, int origin);
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/* Get the current position within the stream. */
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long jas_stream_tell(jas_stream_t *stream);
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/* Seek to the beginning of a stream. */
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int jas_stream_rewind(jas_stream_t *stream);
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/******************************************************************************\
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* Macros/functions for flushing.
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\******************************************************************************/
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/* Flush any pending output to a stream. */
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int jas_stream_flush(jas_stream_t *stream);
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/******************************************************************************\
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* Miscellaneous macros/functions.
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\******************************************************************************/
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/* Copy data from one stream to another. */
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int jas_stream_copy(jas_stream_t *dst, jas_stream_t *src, int n);
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/* Display stream contents (for debugging purposes). */
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int jas_stream_display(jas_stream_t *stream, FILE *fp, int n);
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/* Consume (i.e., discard) characters from stream. */
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int jas_stream_gobble(jas_stream_t *stream, int n);
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/* Write a character multiple times to a stream. */
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int jas_stream_pad(jas_stream_t *stream, int n, int c);
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/* Get the size of the file associated with the specified stream.
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The specified stream must be seekable. */
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long jas_stream_length(jas_stream_t *stream);
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/******************************************************************************\
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* Internal functions.
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\******************************************************************************/
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/* The following functions are for internal use only! If you call them
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directly, you will die a horrible, miserable, and painful death! */
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/* Read a character from a stream. */
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#define jas_stream_getc_macro(stream) \
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((!((stream)->flags_ & (JAS_STREAM_ERR | JAS_STREAM_EOF | \
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JAS_STREAM_RWLIMIT))) ? \
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(((stream)->rwlimit_ >= 0 && (stream)->rwcnt_ >= (stream)->rwlimit_) ? \
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(stream->flags_ |= JAS_STREAM_RWLIMIT, EOF) : \
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jas_stream_getc2(stream)) : EOF)
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#define jas_stream_getc2(stream) \
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((--(stream)->cnt_ < 0) ? jas_stream_fillbuf(stream, 1) : \
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(++(stream)->rwcnt_, (int)(*(stream)->ptr_++)))
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/* Write a character to a stream. */
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#define jas_stream_putc_macro(stream, c) \
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((!((stream)->flags_ & (JAS_STREAM_ERR | JAS_STREAM_EOF | \
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JAS_STREAM_RWLIMIT))) ? \
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(((stream)->rwlimit_ >= 0 && (stream)->rwcnt_ >= (stream)->rwlimit_) ? \
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(stream->flags_ |= JAS_STREAM_RWLIMIT, EOF) : \
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jas_stream_putc2(stream, c)) : EOF)
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#define jas_stream_putc2(stream, c) \
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(((stream)->bufmode_ |= JAS_STREAM_WRBUF, --(stream)->cnt_ < 0) ? \
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jas_stream_flushbuf((stream), (uchar)(c)) : \
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(++(stream)->rwcnt_, (int)(*(stream)->ptr_++ = (c))))
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/* These prototypes need to be here for the sake of the stream_getc and
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stream_putc macros. */
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int jas_stream_fillbuf(jas_stream_t *stream, int getflag);
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int jas_stream_flushbuf(jas_stream_t *stream, int c);
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int jas_stream_getc_func(jas_stream_t *stream);
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int jas_stream_putc_func(jas_stream_t *stream, int c);
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#ifdef __cplusplus
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}
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#endif
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#endif
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