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