php-src/main/php_streams.h

/*
   +----------------------------------------------------------------------+
   | PHP Version 4                                                        |
   +----------------------------------------------------------------------+
   | Copyright (c) 1997-2002 The PHP Group                                |
   +----------------------------------------------------------------------+
   | This source file is subject to version 2.02 of the PHP license,      |
   | that is bundled with this package in the file LICENSE, and is        |
   | available at through the world-wide-web at                           |
   | http://www.php.net/license/2_02.txt.                                 |
   | If you did not receive a copy of the PHP license and are unable to   |
   | obtain it through the world-wide-web, please send a note to          |
   | license@php.net so we can mail you a copy immediately.               |
   +----------------------------------------------------------------------+
   | Author: Wez Furlong (wez@thebrainroom.com)                           |
   +----------------------------------------------------------------------+
 */

#ifndef PHP_STREAMS_H
#define PHP_STREAMS_H

#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#endif

/* See README.STREAMS in php4 root dir for more info about this stuff */

/* The contents of the php_stream_ops and php_stream should only be accessed
 * using the functions/macros in this header.
 * If you need to get at something that doesn't have an API,
 * drop me a line <wez@thebrainroom.com> and we can sort out a way to do
 * it properly.
 * 
 * The only exceptions to this rule are that stream implementations can use
 * the php_stream->abstract pointer to hold their context, and streams
 * opened via stream_open_wrappers can use the zval ptr in
 * php_stream->wrapperdata to hold meta data for php scripts to
 * retrieve using fgetwrapperdata(). */

typedef struct _php_stream php_stream;

typedef struct _php_stream_ops  {
	/* stdio like functions - these are mandatory! */
	size_t (*write)(php_stream *stream, const char *buf, size_t count);
	size_t (*read)(php_stream *stream, char *buf, size_t count);
	int    (*close)(php_stream *stream, int close_handle);
	int    (*flush)(php_stream *stream);
	/* these are optional */
	int    (*seek)(php_stream *stream, off_t offset, int whence);
	char *(*gets)(php_stream *stream, char *buf, size_t size);
	int (*cast)(php_stream *stream, int castas, void **ret);
	const char *label; /* label for this ops structure */
} php_stream_ops;

/* options uses the IGNORE_URL family of defines from fopen_wrappers.h */
typedef php_stream *(*php_stream_factory_func_t)(char *filename, char *mode, int options, char **opened_path TSRMLS_DC);
typedef void (*php_stream_wrapper_dtor_func_t)(php_stream *stream);

typedef struct _php_stream_wrapper	{
	php_stream_factory_func_t		create;
	php_stream_wrapper_dtor_func_t	destroy;
} php_stream_wrapper;

struct _php_stream  {
	php_stream_ops *ops;
	void *abstract;  		/* convenience pointer for abstraction */

	php_stream_wrapper *wrapper; /* which wrapper was used to open the stream */
	void *wrapperthis;		/* convenience pointer for a instance of a wrapper */
	zval *wrapperdata;		/* fgetwrapperdata retrieves this */

	int is_persistent;
	char mode[16];			/* "rwb" etc. ala stdio */
	/* so we know how to clean it up correctly.  This should be set to
	 * PHP_STREAM_FCLOSE_XXX as appropriate */
	int fclose_stdiocast;
	FILE *stdiocast;    /* cache this, otherwise we might leak! */
}; /* php_stream */
/* state definitions when closing down; these are private to streams.c */
#define PHP_STREAM_FCLOSE_NONE 0
#define PHP_STREAM_FCLOSE_FDOPEN	1
#define PHP_STREAM_FCLOSE_FOPENCOOKIE 2


/* allocate a new stream for a particular ops */
PHPAPI php_stream *php_stream_alloc(php_stream_ops *ops, void *abstract, int persistent, const char *mode);

PHPAPI int php_stream_free(php_stream *stream, int call_dtor);
#define php_stream_close(stream)	php_stream_free(stream, 1)

PHPAPI int php_stream_seek(php_stream *stream, off_t offset, int whence);
#define php_stream_rewind(stream)	php_stream_seek(stream, 0L, SEEK_SET)
PHPAPI off_t php_stream_tell(php_stream *stream);
PHPAPI size_t php_stream_read(php_stream *stream, char *buf, size_t count);
PHPAPI size_t php_stream_write(php_stream *stream, const char *buf, size_t count);
#define php_stream_write_string(stream, str)	php_stream_write(stream, str, strlen(str))
PHPAPI int php_stream_eof(php_stream *stream);
PHPAPI int php_stream_getc(php_stream *stream);
PHPAPI int php_stream_putc(php_stream *stream, int c);
PHPAPI int php_stream_flush(php_stream *stream);
PHPAPI char *php_stream_gets(php_stream *stream, char *buf, size_t maxlen);
PHPAPI int php_stream_puts(php_stream *stream, char *buf);

/* copy up to maxlen bytes from src to dest.  If maxlen is PHP_STREAM_COPY_ALL, copy until eof(src).
 * Uses mmap if the src is a plain file and at offset 0 */
#define PHP_STREAM_COPY_ALL		-1
PHPAPI size_t php_stream_copy_to_stream(php_stream *src, php_stream *dest, size_t maxlen);
/* read all data from stream and put into a buffer. Caller must free buffer when done.
 * The copy will use mmap if available. */
PHPAPI size_t php_stream_copy_to_mem(php_stream *src, char **buf, size_t maxlen, int persistent);

/* maybe implement someday */
#define php_stream_error(stream)	(0)

/* operations for a stdio FILE; use the php_stream_fopen_XXX funcs below */
extern php_stream_ops php_stream_stdio_ops;
/* like fopen, but returns a stream */
PHPAPI php_stream *php_stream_fopen(const char *filename, const char *mode, char **opened_path TSRMLS_DC);
PHPAPI php_stream *php_stream_fopen_with_path(char *filename, char *mode, char *path, char **opened_path TSRMLS_DC);
PHPAPI php_stream *php_stream_fopen_from_file(FILE *file, const char *mode);
PHPAPI php_stream *php_stream_fopen_from_pipe(FILE *file, const char *mode);
PHPAPI php_stream *php_stream_fopen_tmpfile(void);
PHPAPI php_stream *php_stream_fopen_temporary_file(const char *dir, const char *pfx, char **opened_path TSRMLS_DC);

/* coerce the stream into some other form */
/* cast as a stdio FILE * */
#define PHP_STREAM_AS_STDIO     0
/* cast as a POSIX fd or socketd */
#define PHP_STREAM_AS_FD		1
/* cast as a socketd */
#define PHP_STREAM_AS_SOCKETD	2

/* try really, really hard to make sure the cast happens (socketpair) */
#define PHP_STREAM_CAST_TRY_HARD	0x80000000
#define PHP_STREAM_CAST_RELEASE		0x40000000	/* stream becomes invalid on success */
#define PHP_STREAM_CAST_MASK		(PHP_STREAM_CAST_TRY_HARD | PHP_STREAM_CAST_RELEASE)
PHPAPI int php_stream_cast(php_stream *stream, int castas, void **ret, int show_err);
/* use this to check if a stream can be cast into another form */
#define php_stream_can_cast(stream, as)	php_stream_cast(stream, as, NULL, 0)

/* use this to check if a stream is of a particular type:
 * PHPAPI int php_stream_is(php_stream *stream, php_stream_ops *ops); */
#define php_stream_is(stream, anops)		((stream)->ops == anops)
#define PHP_STREAM_IS_STDIO &php_stream_stdio_ops

#define php_stream_is_persistent(stream)	(stream)->is_persistent

/* Wrappers support */

#define IGNORE_PATH			0
#define USE_PATH			1
#define IGNORE_URL			2
/* There's no USE_URL. */
#define ENFORCE_SAFE_MODE 	4
#define REPORT_ERRORS		8
/* If you don't need to write to the stream, but really need to
 * be able to seek, use this flag in your options. */
#define STREAM_MUST_SEEK	16

#ifdef PHP_WIN32
# define IGNORE_URL_WIN IGNORE_URL
#else
# define IGNORE_URL_WIN 0
#endif

int php_init_stream_wrappers(TSRMLS_D);
int php_shutdown_stream_wrappers(TSRMLS_D);
PHPAPI int php_register_url_stream_wrapper(char *protocol, php_stream_wrapper *wrapper TSRMLS_DC);
PHPAPI int php_unregister_url_stream_wrapper(char *protocol TSRMLS_DC);
PHPAPI php_stream *php_stream_open_wrapper(char *path, char *mode, int options, char **opened_path TSRMLS_DC);

#define PHP_STREAM_UNCHANGED	0 /* orig stream was seekable anyway */
#define PHP_STREAM_RELEASED		1 /* newstream should be used; origstream is no longer valid */
#define PHP_STREAM_FAILED		2 /* an error occurred while attempting conversion */
#define PHP_STREAM_CRITICAL		3 /* an error occurred; origstream is in an unknown state; you should close origstream */
/* DO NOT call this on streams that are referenced by resources! */
PHPAPI int php_stream_make_seekable(php_stream *origstream, php_stream **newstream);

#endif

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